WO2023053445A1 - 端末、無線通信方法及び基地局 - Google Patents
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Definitions
- the present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- LTE successor systems for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later
- 5G 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- TRP Transmission/Reception Points
- MTRP Multi-TRP
- UE User Equipment
- Rel. 17 NR support for simultaneous reception of multiple QCL type D channels/signals in the UE is being considered.
- the control of downlink control channel collisions when a UE is capable of receiving multiple QCL type D channels/signals simultaneously has not yet been explored. If this is not considered, UE transmission and reception may be restricted inappropriately, resulting in reduced throughput or degraded communication quality.
- one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately cope with collisions of multiple downlink control channels.
- a terminal monitors a PDCCH for a downlink control channel (Physical Downlink Control Channel (PDCCH)) in a plurality of temporally overlapping control resource sets (CORESET) according to a priority rule. and a receiver for monitoring the determined PDCCH.
- PDCH Physical Downlink Control Channel
- CORESET temporally overlapping control resource sets
- multiple downlink control channel collisions can be handled appropriately.
- FIG. 1 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 1.1.1.
- FIG. 2 is a diagram showing an example of a priority CORESET in embodiment 1.1.2.1.
- FIG. 3 is a diagram showing an example of a priority CORESET in embodiment 1.1.2.1.
- FIG. 4 is a diagram showing an example of a priority CORESET in embodiment 1.1.2.1.
- FIG. 5 is a diagram showing an example of a priority CORESET in embodiment 1.1.2.2.
- FIG. 6 is a diagram showing an example of a priority CORESET and other CORESETs simultaneously monitored in embodiment 1.1.2.
- FIG. 7 is a diagram showing an example of a priority CORESET and other CORESETs simultaneously monitored in Embodiment 1.1.2.
- FIG. 8 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in embodiment 1.2.
- FIG. 9 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 2.1.1.
- FIG. 10 is a diagram showing an example of a priority CORESET in embodiment 2.1.2.1.
- FIG. 11 is a diagram showing an example of priority CORESET in embodiment 2.1.2.2.
- FIG. 12 is a diagram showing an example of a priority CORESET and other CORESETs simultaneously monitored in Embodiment 2.1.2.
- FIG. 13 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in embodiment 2.2.
- FIG. 10 is a diagram showing an example of a priority CORESET in embodiment 2.1.2.1.
- FIG. 11 is a diagram showing an example of priority CORESET in embodiment 2.1.2.2.
- FIG. 12 is a diagram showing an example of a priority CORESET and other C
- FIG. 14 is a diagram showing an example of another CORESET being monitored simultaneously with a priority CORESET having two TCI states.
- FIG. 15 shows an example of another CORESET being monitored simultaneously with a priority CORESET having only one TCI state.
- FIG. 16 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment;
- FIG. 17 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 18 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment;
- FIG. 19 is a diagram illustrating an example of hardware configurations of a base station and user terminals according to an embodiment.
- FIG. 20 is a diagram illustrating an example of a vehicle according to one embodiment;
- the reception processing e.g., reception, demapping, demodulation, decoding
- transmission processing e.g, at least one of transmission, mapping, precoding, modulation, encoding
- the TCI state may represent those that apply to downlink signals/channels.
- the equivalent of TCI conditions applied to uplink signals/channels may be expressed as spatial relations.
- the TCI state is information about the pseudo-colocation (QCL) of signals/channels, and may be called spatial reception parameters, spatial relation information, or the like.
- the TCI state may be set in the UE on a channel-by-channel or signal-by-signal basis.
- QCL is an index that indicates the statistical properties of a signal/channel. For example, when one signal/channel and another signal/channel have a QCL relationship, Doppler shift, Doppler spread, average delay ), delay spread, spatial parameters (e.g., spatial Rx parameter) are identical (QCL with respect to at least one of these). You may
- the spatial reception parameters may correspond to the reception beams of the UE (eg, reception analog beams), and the beams may be specified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- QCL types may be defined for the QCL.
- QCL types AD may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be called QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay; • QCL Type D (QCL-D): Spatial reception parameters.
- CORESET Control Resource Set
- QCL QCL type D
- a UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI conditions or QCL assumptions of that signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information about the QCL between the channel of interest (in other words, the reference signal (RS) for the channel) and another signal (for example, another RS). .
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling or a combination thereof.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and other system information ( It may be Other System Information (OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- Physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- target channel/RS target channel/reference signal
- source RS source RS
- Channels for which the TCI state or spatial relationship is set are, for example, a downlink shared channel (PDSCH), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel ( Physical Uplink Shared Channel (PUSCH)) and uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH downlink shared channel
- PDCCH Physical Downlink Control Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- RSs that have a QCL relationship with the channel are, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding Reference Signal (SRS)), CSI-RS for tracking (also called Tracking Reference Signal (TRS)), reference signal for QCL detection (also called QRS), reference signal for demodulation (DeModulation Reference Signal (DMRS)), etc. It may be one.
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- SRS Sounding Reference Signal
- TRS Tracking Reference Signal
- QRS reference signal for QCL detection
- DMRS DeModulation Reference Signal
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be called an SS/PBCH block.
- a QCL type X RS in a TCI state may mean an RS that has a QCL type X relationship with (the DMRS of) a certain channel/signal, and this RS is called a QCL type X QCL source in that TCI state.
- a UE can only receive, detect or monitor channels/signals of the same QCL type D at the same time, but can receive and detect multiple channels/signals of different QCL type D at the same time. or could not be monitored. For this reason, in the case of multiple channels/signals colliding (i.e. transmitted/received at overlapping times), to ensure that the multiple channels/signals fall under the same QCL type D, or In order to avoid such cases, the following constraints (which may also be called priority rules, QCL application rules, etc.) are set according to Rel. 15/16 NR specification.
- multiple channels/signals colliding means that multiple channels/signals of different QCL type D are scheduled (or configured) to be received (or transmitted) in the same time resource (duration). It may mean that
- the difference between QCL type D (reference RS of) a certain channel/signal and QCL type D (reference RS of another channel/signal) means that communication of the certain channel/signal is It may mean that the beam used is different from the beam used for communication of the other channel/signal.
- QCL type D (of reference RS) of one channel/signal and QCL type D (of reference RS) of another channel/signal are different means that one channel/signal and another channel / signals are different QCL type D, their QCL type D characteristics are different, "QCL type D" is different, and so on.
- ⁇ PDCCH vs. PDCCH> If the UE is configured for single-cell operation or configured for carrier aggregation in the same frequency band, and multiple active DL BWPs of one or more cells have the same or different QCL type D characteristics When monitoring PDCCH candidates with overlapping monitoring occasions in a CORESET, monitor PDCCH only in a CORESET and CORESETs having the same QCL type D characteristics as the CORESET among the CORESETs.
- This "some CORESET” corresponds to the lowest-indexed CSS set in the lowest-indexed cell containing the Common Search Space (CSS) set, if any; Corresponds to the UE-specific Search Space (USS) set of indices.
- a minimum USS set index is determined over all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.
- the CSS set is preferentially monitored over the USS set, and between SS sets of the same type (CSS or USS)
- the CORESET to be monitored is determined according to the priority rule that the one with the smaller index (that is, the one with the smaller cell index. If the cell indices are the same, the one with the smaller SS set index) is preferentially monitored. .
- the SS set index may correspond to the value set by the RRC parameter SearchSpaceId for identifying the search space.
- the CSS set index may mean the SS set index for the SS set whose search space type (RRC parameter “searchSpaceType”) indicates CSS.
- the USS set index may refer to the SS set index for the SS set whose search space type (RRC parameter “searchSpaceType”) indicates USS.
- Multi-TRP Multi-TRP Rel. 15
- CORESETPoolIndex one TCI state without a CORESET pool index
- TRP Transmission/Reception Points
- MTRP Multi-TRP
- PDCCH repetition is applied to PDCCH (or DCI) transmitted from one or more TRPs.
- PDCCHs or DCI transmitted from one or more TRPs.
- multiple PDCCHs (or DCIs) transmitted from one or more TRPs may be used to schedule or transmit/receive instructions for one or more signals/channels.
- PDCCH/DCI to which repeated transmission is applied may be called multi-PDCCH/multi-DCI.
- Repeated transmission of PDCCH may be replaced with PDCCH repetition, multiple transmission of PDCCH, multiple PDCCH transmission or multiple PDCCH transmission, MTR PDCCH, and the like.
- Multi-PDCCH/multi-DCI may be transmitted from different TRPs, respectively.
- the multiple PDCCH/DCI may be multiplexed using time division multiplexing (TDM)/frequency division multiplexing (FDM)/space division multiplexing (SDM) .
- PDCCH may be transmitted using different time resources from multiple TRPs.
- PDCCH may be transmitted using different frequency-time resources from multiple TRPs.
- FDM PDCCH repetition two sets of Resource Element Groups (REG), Control Channel Element (CCE) of the transmitted PDCCH, two transmitted PDCCH repetitions that do not overlap in frequency, At least one of the non-overlapping multi-chance transmitted PDCCHs may be associated with a different TCI state.
- REG Resource Element Groups
- CCE Control Channel Element
- SDM PDCCH repetition PDCCH may be transmitted using the same time/frequency resource from multiple TRPs.
- the PDCCH DMRS in all REGs/CCEs of that PDCCH may be associated with two TCI states.
- SDM may be interchangeably read as single frequency network (SFN).
- the SFN may contribute to at least one of high speed train (HST) operation and reliability improvement.
- HST high speed train
- two PDCCH candidates in two search space sets may be linked and each search space set may be associated with a corresponding CORESET.
- the two search space sets may be associated with the same or different CORESETs.
- one (maximum one) TCI state can be set/activated in higher layer signaling (RRC signaling/MAC CE).
- two search space sets are associated with different CORESETs with different TCI states, it may imply a repeated transmission of multi-TRP. If two search space sets are associated with the same CORESET (with the same TCI state CORESET), it may imply repeated transmission of a single TRP.
- a UE that applies FDM/SDM PDCCH repetition should be able to receive multiple beams (multiple QCL type D channels/signals) simultaneously.
- PDCCH collision control when the UE can receive multiple beams (multiple QCL type D channels/signals) at the same time has not yet been investigated. . If this is not considered, UE transmission and reception may be restricted inappropriately, resulting in reduced throughput or degraded communication quality.
- the present inventors conceived of control that can appropriately deal with multiple PDCCH collisions.
- A/B and “at least one of A and B” may be read interchangeably. Also, in the present disclosure, “A/B/C” may mean “at least one of A, B and C.”
- activate, deactivate, indicate (or indicate), select, configure, update, determine, etc. may be read interchangeably.
- supporting, controlling, controllable, operating, capable of operating, etc. may be read interchangeably.
- Radio Resource Control RRC
- RRC parameters RRC parameters
- RRC messages higher layer parameters
- information elements IEs
- settings etc.
- MAC Control Element CE
- update command activation/deactivation command, etc.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- MAC signaling may use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (PDU), and the like.
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and other system information ( It may be Other System Information (OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- the physical layer signaling may be, for example, downlink control information (DCI), uplink control information (UCI), or the like.
- DCI downlink control information
- UCI uplink control information
- indices, identifiers (ID), indicators, resource IDs, etc. may be read interchangeably.
- sequences, lists, sets, groups, groups, clusters, subsets, etc. may be read interchangeably.
- DMRS port group e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (for example, reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI State (unified TCI state), common TCI state (common TCI state), Quasi-Co-Location (QCL), QCL assumption, etc. may be read interchangeably.
- TCI state downlink Transmission Configuration Indication state
- DL TCI state uplink TCI state
- UL TCI state uplink TCI state
- unified TCI State unified TCI state
- common TCI state common TCI state
- QCL Quasi-Co-Location
- the spatial relationship information Identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be read interchangeably.
- “Spatial relationship information” may be read interchangeably as “a set of spatial relationship information”, “one or more spatial relationship information”, and the like.
- the TCI state and TCI may be read interchangeably.
- the panel may relate to at least one of the group index of the SSB/CSI-RS group, the group index of the group-based beam reporting, the group index of the SSB/CSI-RS group for the group-based beam reporting.
- single PDCCH may be assumed to be supported when multiple TRPs utilize the ideal backhaul.
- Multi-PDCCH may be assumed to be supported when inter-multi-TRP utilizes non-ideal backhaul.
- the ideal backhaul may also be called DMRS port group type 1, reference signal related group type 1, antenna port group type 1, CORESET pool type 1, and so on.
- Non-ideal backhaul may be referred to as DMRS port group type 2, reference signal associated group type 2, antenna port group type 2, CORESET pool type 2, and so on. Names are not limited to these.
- multi-TRP multi-TRP system
- multi-TRP transmission multi-PDSCH
- single DCI sDCI
- single PDCCH multi-TRP system based on single DCI
- sDCI-based MTRP activating two TCI states on at least one TCI codepoint
- multi-DCI multi-PDCI
- multi-PDCCH multi-PDCCH
- multi-TRP system based on multi-DCI
- the QCL of the present disclosure may be read interchangeably with QCL Type D.
- TCI state A is the same QCL type D as TCI state B
- TCI state A is the same as TCI state B
- TCI state A is TCI state B
- QCL type D in the present disclosure There is” etc. may be read interchangeably.
- overlapping multiple CORESETs may mean that monitoring opportunities for the multiple CORESETs overlap.
- the overlap of multiple CORESETs can be defined as within the Bandwidth Part (BWP) / within the Component Carrier (CC) / within the band / within the frequency range / within the UE (in addition, within the UE may mean that there are monitoring opportunities for the plurality of CORESETs in the same symbol (which may be read in all frequencies/all bands, etc.).
- BWP Bandwidth Part
- CC Component Carrier
- within the UE may mean that there are monitoring opportunities for the plurality of CORESETs in the same symbol (which may be read in all frequencies/all bands, etc.).
- a CORESET having a TCI state may refer to a CORESET having that TCI state activated (or having an active TCI state or indicated an active TCI state).
- a CORESET having one TCI state may mean a CORESET having only one TCI state.
- a first embodiment relates to the SFN PDCCH repetition scheme.
- one or more TCI states may be activated per CORESET. Activation of the TCI state for CORESET may be signaled to the UE using MAC CE.
- the UE selects the monitored PDCCH (CORESET) based on at least one priority rule shown in embodiments 1.1-1.3. to decide. Each of these will be described below.
- the CORESET to be monitored that is determined from the priority rule will be simply referred to as "prioritized CORESET", the highest priority CORESET, and the like.
- the priority rule of embodiment 1.1 is Rel. Same as 16 NR. That is, the UE monitors the CSS set with priority over the USS set, and between the SS sets of the same type (CSS or USS), the smaller index (that is, the smaller cell index. If the cell index is the same , and furthermore, the priority CORESET is determined according to the priority rule that the SS set index is smaller) is preferentially monitored.
- Embodiment 1.1 is further subdivided into the following two: Embodiment 1.1.1: Priority CORESET has two active TCI states (two QCL type D), Embodiment 1.1.2: Priority CORESET has one active TCI state (one QCL type D).
- the UE shall accept this CORESET if the following conditions (1.1.1a) or (1.1.1b) are met: may be monitored: (1.1.1a) the two active TCI states are the same QCL type D as the two active TCI states of the preferred CORESET; (1.1.1b) One of the two active TCI states is of the same QCL type D as one of the two active TCI states of the preferred CORESET.
- the UE applies only the TCI state that is of QCL type D as one of the two active TCI states of the preferred CORESET to monitor said CORESET.
- FIG. 1 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 1.1.1.
- four CORESETs (CORESET#1-#4) overlap in time.
- the UE first selects CORESET#1 corresponding to the CSS set as the priority CORESET. Since CORESET#1 has two active TCI states, it operates as in embodiment 1.1.1.
- TCI state of CORESET#2 is QCL type D, which is the same as TCI state #2 of the preferred CORESET, the UE monitors CORESET#2.
- the UE monitors CORESET#3 because the two TCI states of CORESET#3 are QCL type D, which is the same as TCI states #1 and #2 of the preferred CORESET.
- One of the two TCI states of CORESET#4 is of QCL type D, the same as TCI state #1 of the preferred CORESET, but the other is of QCL type D (TCI state #3), which is different from TCI state #2 of the preferred CORESET. . Therefore, a UE according to (1.1.1a) above does not monitor CORESET#4. A UE according to (1.1.1b) above monitors CORESET#4 applying only TCI state #1.
- the priority CORESET with one active TCI state that is determined first according to the same priority rules as 16 NR is also called the first priority CORESET, and the priority CORESET other than the first priority CORESET that is determined next is called the first priority CORESET. , is also called a second priority CORESET.
- the second priority CORESET may be called CORESET X.
- One active TCI state of the first priority CORESET may be called a first priority TCI state (1st priority TCI state). Any of the active TCI states of the second priority CORESET may be referred to as a second priority TCI state.
- Embodiment 1.1.2 is roughly divided into Embodiments 1.1.2.1 and 1.1.2.2 according to the method of determining the second priority CORESET.
- the second priority CORESET is obtained from Rel. 16 may be determined according to the same priority rules. That is, the second priority CORESET corresponds to the lowest-indexed CSS set in the lowest-indexed cell containing the CSS set, if any, of the remaining colliding CORESETs; It may correspond to the USS set of indices. A minimum USS set index is determined over all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.
- the second preferred CORESET candidate derived according to the above precedence rule has only one active TCI state, and if that active TCI state is the same as the first preferred TCI state, then the next candidate (next (corresponding to the SS set/cell with the lowest index of ) may be searched as a candidate for the second preferred CORESET. That is, for a CORESET with only one active TCI state, the UE may continue searching for the second preferred CORESET until the active TCI state is different from the first preferred TCI state.
- the UE determines this active TCI state as the second preferred TCI state and sets this CORESET as the second preferred TCI state. 2 may be determined as the preferred CORESET.
- the UE shall only be configured if the candidate for the second preferred CORESET derived according to the above priority rule has only one active TCI state, and if the active TCI state is the same as the first preferred TCI state, may also determine this active TCI state as the second preferred TCI state and this candidate as the second preferred CORESET.
- the second priority CORESET will be the same as the first priority CORESET, so it may be expressed that there is no second priority CORESET.
- the second preferred CORESET candidate derived according to the above precedence rule has two active TCI states, and one of the two active TCI states is the same as the first preferred TCI state, the UE , the other of the two active TCI states may be determined as the second preferred TCI state, and this candidate may be determined as the second preferred CORESET.
- the UE determines that the second preferred CORESET candidate derived according to the above priority rule has two active TCI states, and both of the two active TCI states are different from the first preferred TCI state.
- one of the two active TCI states may be determined as the second preferred TCI state, and this candidate may be determined as the second preferred CORESET.
- This one TCI state may be the one with the smallest or largest TCI state ID of the two active TCI states, or the one corresponding to the first or second TCI state activated by the MAC CE. may be
- FIG. 2 is a diagram showing an example of a priority CORESET in Embodiment 1.1.2.1.
- three CORESETs (CORESET#1-#3) overlap in time.
- the UE first selects CORESET#1 corresponding to the CSS set as the priority CORESET. Since CORESET#1 has one active TCI state, it operates as in embodiment 1.1.2. This priority CORESET corresponds to the first priority CORESET, and TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET. Since one TCI state of CORESET#3 is different from TCI state #1 of the preferred CORESET, the UE determines this TCI state #2 as the second preferred TCI state and CORESET#3 as the second preferred CORESET. and monitor.
- FIG. 3 is a diagram showing an example of priority CORESET in Embodiment 1.1.2.1.
- two CORESETs (CORESET#1-#2) overlap in time.
- the UE first selects CORESET#1 corresponding to the CSS set as the priority CORESET. Since CORESET#1 has one active TCI state, it operates as in embodiment 1.1.2. This priority CORESET corresponds to the first priority CORESET, and TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET. Since one of the two active TCI states in CORESET#2 is the same as the first preferred TCI state, the UE determines the other of the two active TCI states (TCI state #2) as the second preferred TCI state; CORESET#2 is determined as the second priority CORESET and monitored.
- FIG. 4 is a diagram showing an example of a priority CORESET in Embodiment 1.1.2.1.
- two CORESETs (CORESET#1-#2) overlap in time.
- the UE first selects CORESET#1 corresponding to the CSS set as the priority CORESET. Since CORESET#1 has one active TCI state, it operates as in embodiment 1.1.2. This priority CORESET corresponds to the first priority CORESET, and TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET. Since both of the two active TCI states in CORESET#2 are different from the first preferred TCI state, the UE prioritizes the TCI state with the highest TCI state ID (TCI state #3) among the two active TCI states. 2 as the preferred TCI state and CORESET#2 as the second preferred CORESET, where only TCI state #3 is applied to monitor PDCCH candidates.
- TCI state #3 TCI state ID
- the UE From the remaining colliding CORESETs excluding the first preferred CORESET, the UE first selects the subset of CORESETs that have two active TCI states, one of which has the same TCI state as the first preferred TCI state. to decide.
- the UE converts the second priority CORESET to Rel. Determined according to the same priority rules as in 16. That is, the second priority CORESET corresponds to the lowest-indexed CSS set in the lowest-indexed cell containing the CSS set, if any, among the CORESETs included in the subset; It may correspond to the USS set with the lowest index.
- a minimum USS set index is determined over all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.
- the second preferred TCI state corresponds to the active TCI state of the second preferred CORESET that is different from the first preferred TCI state.
- both the first preferred TCI and second preferred TCI states can be used to monitor the PDCCH candidates (CORESET).
- FIG. 5 is a diagram showing an example of priority CORESET in Embodiment 1.1.2.2.
- four CORESETs (CORESET#1-#4) overlap in time.
- the UE first selects CORESET#1 corresponding to the CSS set as the priority CORESET. Since CORESET#1 has one active TCI state, it operates as in embodiment 1.1.2. This priority CORESET corresponds to the first priority CORESET, and TCI state #1 corresponds to the first priority TCI state.
- CORESET#4 is the only CORESET that has two active TCI states, one of which has the same TCI state as the first preferred TCI state. Therefore, the UE determines TCI state #2 different from the first preferred TCI state among the TCI states of CORESET #4 as the second preferred TCI state, and decides CORESET #4 as the second preferred CORESET, CORESET#4 applies TCI states #1 and #2 to monitor PDCCH candidates.
- the UE shall accept this CORESET if the following conditions (1.1.2a) or (1.1.2b) are met: may be monitored: (1.1.2a) the one active TCI state is the same QCL type D as the first preferred TCI state; (1.1.2b) the one active TCI state is of the same QCL type D as the first preferred TCI state or the second preferred TCI state;
- FIG. 6 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 1.1.2.
- three CORESETs (CORESET#1-#3) overlap in time.
- the UE first selects CORESET#1 corresponding to the CSS set as the priority CORESET. Since CORESET#1 has one active TCI state, it operates as in embodiment 1.1.2. This priority CORESET corresponds to the first priority CORESET, and TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET.
- CORESET#2 is the only CORESET that has two active TCI states, one of which has the same TCI state as the first preferred TCI state. Therefore, the UE determines TCI state #2 different from the first preferred TCI state among the TCI states of CORESET#2 as the second preferred TCI state, decides CORESET#2 as the second preferred CORESET, CORESET#2 applies TCI states #1 and #2 to monitor PDCCH candidates.
- the UE does not monitor CORESET#3 when considering condition (1.1.2a).
- the UE monitors CORESET#3 if it considers condition (1.1.2b).
- the UE shall comply with (1.1.2c) or (1.1.2d) or (1.1.2e) of the following conditions: This CORESET may be monitored when is satisfied: (1.1.2c) the two active TCI states are of the same QCL type D as the first preferred TCI state and the second preferred TCI state; (1.1.2d) one of the two active TCI states is the same QCL type D as the first preferred TCI state; (1.1.2e) One of the two active TCI states is QCL type D, the same as either the first preferred TCI state or the second preferred TCI state.
- the UE monitors the CORESET by applying only the TCI state that is of QCL type D, which is the same as the first preferred TCI state.
- the UE applies only the TCI state that is the same QCL type D as either the first preferred TCI state or the second preferred TCI state and performs the above CORESET. Monitor.
- FIG. 7 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 1.1.2.
- four CORESETs (CORESET#1-#4) overlap in time.
- the UE first selects CORESET#1 corresponding to the CSS set as the priority CORESET. Since CORESET#1 has one active TCI state, it operates as in embodiment 1.1.2. This priority CORESET corresponds to the first priority CORESET, and TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET.
- the CORESETs that have two active TCI states are CORESETs #2 and #3.
- the UE determines CORESET#2 with the smaller SS set index as the second preferred CORESET.
- the UE determines TCI state #2 different from the first preferred TCI state among the TCI states of CORESET#2 as the second preferred TCI state, and applies TCI states #1 and #2 to PDCCH in CORESET#2. Monitor Candidates.
- the UE does not monitor CORESET#3 when considering condition (1.1.2c). If the UE considers conditions (1.1.2d) or (1.1.2e), it monitors CORESET#3 applying TCI state #1 only.
- the UE does not monitor CORESET#4 when considering condition (1.1.2c) or (1.1.2d). If the UE considers condition (1.1.2e), it monitors CORESET#4 applying TCI state #2 only.
- Embodiment 1.2 The precedence rules for embodiment 1.2 are as follows: Step 1: Rel. Apply a precedence rule of 16 NR. If the preferred CORESET is found, exit the step. Otherwise, go to step 2. Step 2: If no preferred CORESET was found in step 1, then Rel. Apply a precedence rule of 16 NR.
- the order is CSS set with 2 active TCI states > USS set with 2 active TCI states > CSS set with 1 active TCI state > USS set with 1 active TCI state.
- the UE determines the priority CORESET according to the priority rule that the CORESET to be monitored is preferentially determined.
- the one with the smaller index (that is, the one with the smaller cell index. If the cell index is the same, the SS set index is more whichever is smaller) is selected as the preferred CORESET.
- the CORESET to be monitored may be determined from CORESETs other than the priority CORESET. That is, for a CORESET other than a preferred CORESET that has one active TCI state, if that one active TCI state is the same QCL type D as either of the two active TCI states of the preferred CORESET: The UE may monitor this CORESET.
- the UE shall allow this CORESET if (1.1.1a) or (1.1.1b) above is met. may be monitored.
- FIG. 8 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 1.2.
- four CORESETs (CORESET#1-#4) overlap in time.
- the CORESETs with two active TCI states are CORESET #3 and #4, and CORESET #3 corresponding to the smaller SS set index is selected as the preferred CORESET.
- TCI state of CORESET#1 is QCL type D, which is the same as TCI state #1 of the preferred CORESET, the UE monitors CORESET#1.
- TCI state of CORESET#2 is QCL type D, which is the same as TCI state #2 of the preferred CORESET, the UE monitors CORESET#2.
- One of the two TCI states of CORESET#4 is of QCL type D, the same as TCI state #1 of the preferred CORESET, but the other is of QCL type D (TCI state #3), which is different from TCI state #2 of the preferred CORESET. . Therefore, a UE according to (1.1.1a) above does not monitor CORESET#4. A UE according to (1.1.1b) above monitors CORESET#4 applying only TCI state #1.
- Step 1 If there is a CORESET that has two active TCI states among the colliding CORESETs and that corresponds to the lowest-indexed CSS set in the lowest-indexed cell containing the CSS set, determine this as the preferred CORESET. and exit the step. Otherwise, go to step 2.
- Step 2 If there is a CORESET that has one active TCI state among the colliding CORESETs and that corresponds to the lowest-indexed CSS set in the lowest-indexed cell that contains the CSS set, determine this as the preferred CORESET. and exit the step. Otherwise, go to step 3.
- Step 3 If there is a CORESET that has two active TCI states among the colliding CORESETs and that corresponds to the lowest-indexed USS set in the lowest-indexed cell that contains the USS set, determine this as the preferred CORESET. and exit the step. Otherwise, go to step 4.
- Step 4 If there is a CORESET with one active TCI state among the colliding CORESETs that corresponds to the lowest-indexed USS set in the lowest-indexed cell containing the USS set, determine this as the preferred CORESET. and exit the step.
- the order is CSS set with 2 active TCI states > CSS set with 1 active TCI state > USS set with 2 active TCI states > USS set with 1 active TCI state.
- the UE determines the priority CORESET according to the priority rule that the CORESET to be monitored is preferentially determined.
- the one with the smaller index (that is, the one with the smaller cell index. If the cell index is the same, the SS set index is more whichever is smaller) is selected as the preferred CORESET.
- the UE may determine a CORESET to monitor from CORESETs other than the priority CORESET based on Embodiment 1.1.1.
- the UE may further determine a CORESET to monitor from CORESETs other than the priority CORESET based on Embodiment 1.1.2.
- the CORESET corresponding to the type 0-PDCCH CSS set (in other words, the CSS set for receiving system information) has an SS set index of 0, the existing Rel. In the priority rule of 15/16 NR, it always had the highest priority, but in the priority rule of Embodiment 1.3, the CORESET corresponding to the type 0-PDCCH CSS set with one TCI state is divided into two It has a lower priority than CORESETs corresponding to other CSS sets with TCI states.
- a second embodiment relates to the FDM PDCCH repetition scheme. It should be noted that the second embodiment is not limited to the FDM PDCCH repetition scheme, and may be applied to a non-SFN PDCCH repetition scheme.
- two SS sets with corresponding multiple CORESETs may be used for PDCCH repetition.
- the association between the two SS sets and the plurality of CORESETs may be defined in advance by specifications, or may be set in the UE by higher layer signaling (eg, RRC signaling).
- the UE determines the priority CORESET based on at least one priority rule shown in embodiments 2.1-2.3. Each of these will be described below.
- the association between one CORESET (eg, priority CORESET) and another CORESET may be defined in advance by specifications, or may be set in the UE by higher layer signaling (eg, RRC signaling). Moreover, what is associated is not limited to CORESETs, and CORESETs and SS sets may be associated, or SS sets may be associated.
- the priority CORESET may be read as "priority CORESET/SS set corresponding to the priority CORESET”. Further, in the second embodiment, another CORESET may be read as "another CORESET/an SS set corresponding to another CORESET”.
- association in the second embodiment may be called association for collision control of multiple PDCCHs, association for CORESET selection for PDCCH monitoring, association for CORESET priority, and the like.
- the priority rule of embodiment 2.1 is Rel. Same as 16 NR. That is, the UE monitors the CSS set with priority over the USS set, and between the SS sets of the same type (CSS or USS), the smaller index (that is, the smaller cell index. If the cell index is the same , and furthermore, the priority CORESET is determined according to the priority rule that the SS set index is smaller) is preferentially monitored.
- Embodiment 2.1 is further subdivided into the following two: Embodiment 2.1.1: Preferred CORESET is associated with another CORESET, - Embodiment 2.1.2: A preferred CORESET is not associated with another CORESET.
- the UE may monitor another CORESET related to the preferred CORESET at the same time as the preferred CORESET.
- the TCI state of the priority CORESET may be called the 1st priority TCI state. Also, the TCI state of the other CORESET may be called a second priority TCI state.
- the UE monitors this CORESET if the following conditions (2.1.1a) or (2.1.1b) are met: You may: (2.1.1a) the TCI state is the same QCL type D as the first preferred TCI state; (2.1.1b) the TCI state is the same QCL type D as the first preferred TCI state or the second preferred TCI state;
- FIG. 9 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 2.1.1.
- three CORESETs (CORESET#1-#3) overlap in time.
- CORESETs #1 and #2 are associated with each other.
- the UE first selects CORESET#1 corresponding to the USS set with the smallest USS set index as the preferred CORESET. Since CORESET#1 has another CORESET (CORESET#2) associated with it, it will be the operation of embodiment 2.1.1.
- CORESET#2 Since CORESET#2 is associated with the priority CORESET, the UE monitors CORESET#2. The UE determines the active TCI state of CORESET#2 as the second preferred TCI state.
- CORESET#3 is not associated with a preferred CORESET
- the active TCI state of CORESET#3 is the same QCL type D as the second preferred TCI state. Therefore, a UE according to (2.1.1a) above does not monitor CORESET#3.
- a UE according to (2.1.1b) above monitors CORESET#3.
- the priority CORESET determined first according to the same priority rule as 16 NR is also called the first priority CORESET, and the priority CORESET other than the first priority CORESET determined next is also called the second priority CORESET. call.
- the second priority CORESET may be called CORESET X.
- the active TCI state of the first priority CORESET may be called the 1st priority TCI state.
- the active TCI state of the second priority CORESET may be referred to as the second priority TCI state.
- Embodiment 2.1.2 is roughly divided into Embodiments 2.1.2.1 and 2.1.2.2 according to the method of determining the second priority CORESET.
- the second priority CORESET is obtained from Rel. 16 may be determined according to the same priority rules. That is, the second priority CORESET corresponds to the lowest-indexed CSS set in the lowest-indexed cell containing the CSS set, if any, of the remaining colliding CORESETs; It may correspond to the USS set of indices. A minimum USS set index is determined over all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.
- the second preferred CORESET candidate's active TCI state derived according to the above precedence rules, is the same as the first preferred TCI state, select the next candidate (the CORESET corresponding to the next lowest indexed SS set/cell). It may be searched as a candidate for the second priority CORESET. That is, the UE may continue searching for the second preferred CORESET until the active TCI state differs from the first preferred TCI state.
- the UE determines this active TCI state as the second preferred TCI state and sets this CORESET as the second preferred TCI state. 2 may be determined as the preferred CORESET.
- the UE uses this active TCI state as the second preferred TCI state. determined and this candidate may be determined as the second preferred CORESET.
- the second priority CORESET will be the same as the first priority CORESET, so it may be expressed that there is no second priority CORESET.
- FIG. 10 is a diagram showing an example of priority CORESET in Embodiment 2.1.2.1.
- three CORESETs (CORESET#1-#3) overlap in time.
- the UE first selects CORESET#1 corresponding to the USS set with the smallest USS set index as the preferred CORESET.
- CORESET#1 does not have another CORESET associated with it, so it behaves as in embodiment 2.1.2.
- This priority CORESET corresponds to the first priority CORESET
- TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET. Since the TCI state of CORESET#3 (TCI state #2) is different from TCI state #1 of the preferred CORESET, the UE determines this TCI state #2 as the second preferred TCI state and CORESET#3 as the second preferred TCI state. Determine and monitor as the priority CORESET.
- the UE From the remaining colliding CORESETs excluding the first preferred CORESET, the UE first determines the subset of CORESETs that are associated with another CORESET and whose TCI state is the same as the first preferred TCI state.
- the UE converts the second priority CORESET to Rel. It may be determined according to a priority rule similar to 16. That is, the second priority CORESET corresponds to the lowest-indexed CSS set in the lowest-indexed cell containing the CSS set, if any, among the CORESETs included in the subset; It may correspond to the USS set with the lowest index. A minimum USS set index is determined over all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.
- the second preferred TCI state may correspond to the active TCI state of another CORESET associated with the second preferred CORESET.
- the second priority CORESET may be the CORESET associated with the CORESET corresponding to the lowest-indexed CSS set in the lowest-indexed cell containing the CSS set, if any, among the CORESETs included in the subset, Otherwise, it may be the CORESET associated with the CORESET corresponding to the lowest index USS set in the lowest index cell.
- the second preferred TCI state may correspond to the active TCI state of the second preferred CORESET.
- FIG. 11 is a diagram showing an example of priority CORESET in Embodiment 2.1.2.2.
- four CORESETs (CORESET#1-#4) overlap in time.
- CORESET#1 is not associated with any other CORESET.
- CORESET#2 is not associated with any other CORESET.
- CORESETs #3 and #4 are associated with each other.
- the UE first selects CORESET#1 corresponding to the USS set with the smallest USS set index as the preferred CORESET.
- CORESET#1 does not have another CORESET associated with it, so it behaves as in embodiment 2.1.2.
- This priority CORESET corresponds to the first priority CORESET
- TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET.
- CORESET #3 is the only one that has another CORESET associated with it and whose TCI state is the same as the first preferred TCI state.
- the UE determines CORESET#3 as the second preferred CORESET and TCI state #2 of CORESET#4 associated with CORESET#3 as the second preferred TCI state.
- the UE monitors PDCCH candidates in CORESET #3 and #4.
- the UE may monitor this CORESET if the following conditions (2.1.2a) or (2.1.2b) are met: (2.1.2a) the TCI state is the same QCL type D as the first preferred TCI state; (2.1.2b) the TCI state is the same QCL type D as the first preferred TCI state or the second preferred TCI state;
- FIG. 12 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 2.1.2.
- four CORESETs (CORESET#1-#4) overlap in time.
- CORESET#1 is not associated with any other CORESET.
- CORESETs #2 and #3 are associated with each other.
- the UE first selects CORESET#1 corresponding to the USS set with the smallest USS set index as the preferred CORESET.
- CORESET#1 does not have another CORESET associated with it, so it behaves as in embodiment 2.1.2.
- This priority CORESET corresponds to the first priority CORESET
- TCI state #1 corresponds to the first priority TCI state.
- the UE searches for a second priority CORESET.
- CORESET #2 is the only one that has another CORESET associated with it and whose TCI state is the same as the first preferred TCI state.
- the UE determines CORESET#2 as the second preferred CORESET and TCI state #2 of CORESET#3 associated with CORESET#2 as the second preferred TCI state.
- the UE monitors PDCCH candidates in CORESET #2 and #3.
- the UE does not monitor CORESET#4 when considering condition (2.1.2a).
- the UE monitors CORESET#4 if it considers condition (2.1.2b).
- Embodiment 2.2 The precedence rules for embodiment 2.2 are as follows: Step 1: If there is a subset of CORESETs that are associated with another CORESET (in other words, have an association with another CORESET) of the colliding CORESETs, Rel. Apply a precedence rule of 16 NR. If the preferred CORESET is found, exit the step. Otherwise, go to step 2. Step 2: If no preferred CORESET was found in step 1, then Rel. Apply a precedence rule of 16 NR.
- a CSS set that has an association with another CORESET (hereinafter also simply referred to as an “association” in the present disclosure) > a USS set that has an association > a CSS set that does not have an association > has an association
- the UE determines the priority CORESET according to the priority rule that the CORESET to be monitored is determined preferentially in the order of USS sets that are not used.
- the smaller the index that is, the smaller the cell index. If the cell index is the same, the SS set index is further ) is selected as the preferred CORESET.
- the CORESET to be monitored may be determined from CORESETs other than the priority CORESET. That is, for the rest of the CORESETs except the priority CORESET and another CORESET associated with the priority CORESET, the UE may , may monitor this CORESET.
- FIG. 13 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in Embodiment 2.2.
- four CORESETs (CORESET#1-#4) overlap in time.
- CORESET#1 is not associated with any other CORESET.
- CORESETs #2 and #3 are associated with each other.
- the CORESETs associated with other CORESETs are CORESETs #2 and #3, and CORESET #2 corresponding to the smaller SS set index is selected as the priority CORESET.
- TCI state #2 of CORESET#2 corresponds to the first priority TCI state.
- TCI state #3 of CORESET#3 associated with the preferred CORESET is determined as the second preferred TCI state.
- the UE monitors PDCCH candidates in CORESET #2 and #3.
- the UE Since the TCI state of CORESET#1 is neither the first preferred TCI state nor the second TCI state, the UE does not monitor CORESET#1. Also, the UE according to (2.1.1a) above does not monitor CORESET#4. A UE according to (2.1.1b) above monitors CORESET#4.
- Step 1 If there is a CORESET that has an association among the conflicting CORESETs and corresponds to the CSS set with the lowest index in the cell with the lowest index that contains the CSS set, determine this as the priority CORESET, and perform the step finish. Otherwise, go to step 2.
- Step 2 If there is a CORESET that does not have an association among the conflicting CORESETs and corresponds to the CSS set with the lowest index in the cell with the lowest index that contains the CSS set, determine this as the priority CORESET, and step exit. Otherwise, go to step 3.
- Step 3 If there is a CORESET that has an association among the colliding CORESETs and corresponds to the lowest-indexed USS set in the lowest-indexed cell that contains the USS set, determine this as the preferred CORESET, and perform the step finish. Otherwise, go to step 4.
- Step 4 If there is a CORESET that has no association among the conflicting CORESETs and corresponds to the lowest index USS set in the lowest index cell containing the USS set, determine this as the priority CORESET, and step exit.
- the CORESET to be monitored is preferentially determined in the order of CSS set with association>CSS set without association>USS set with association>USS set without association.
- the UE determines the priority CORESET.
- the smaller the index that is, the smaller the cell index. If the cell index is the same, the SS set index is further ) is selected as the preferred CORESET.
- the UE may determine a CORESET to monitor from CORESETs other than the priority CORESET based on Embodiment 2.1.1.
- the UE may further determine a CORESET to monitor from CORESETs other than the priority CORESET based on Embodiment 2.1.2.
- the CORESET corresponding to the type 0-PDCCH CSS set (in other words, the CSS set for receiving system information) has an SS set index of 0, the existing Rel. In the priority rule of 15/16 NR, it always had the highest priority, but in the priority rule of Embodiment 1.3, the CORESET corresponding to the type 0-PDCCH CSS set with one TCI state is divided into two It has a lower priority than CORESETs corresponding to other CSS sets with TCI states.
- the UE monitors PDCCH candidates in one or more CORESETs using both the two TCI states.
- the UE monitors PDCCH candidates in one or more CORESETs using only one TCI state.
- the one or more CORESETs may be abandoned from being used as SFN-CORESET (CORESET for SFN).
- a preferred CORESET is selected among all overlapping CORESETs (eg, SFN-CORESET) with two TCI states (in other words, in favor of the CORESET with two TCI states) according to the above preferred rule. may be selected based on
- the (first/second) priority CORESET is selected. If the preferred CORESET has two TCI states, all CORESETs with either or both of the two TCI states may be monitored by the UE. If the priority CORESET has only one TCI state, all CORESETs having at least that one TCI state may be monitored by the UE, and all CORESETs having only this TCI state may be monitored by the UE. may
- FIG. 14 is a diagram showing an example of another CORESET monitored simultaneously with a priority CORESET having two TCI states.
- three CORESETs (CORESET#1-#3) overlap in time.
- CORESET#1 has two active TCI states (TCI states #1 and #2).
- CORESET#2 has one active TCI state (TCI state #1).
- CORESET#3 has two active TCI states (TCI states #1 and #3).
- CORESET#2 has only one of the TCI states (TCI state #1) that the priority CORESET has.
- the UE may monitor CORESET#2 with TCI state #1 along with CORESET#1 if all CORESETs with either of the two TCI states that the preferred CORESET has are monitored.
- the UE may not monitor CORESET#2 along with CORESET#1 if all CORESETs with both of the two TCI states that the preferred CORESET has are monitored.
- CORESET#3 has one of the TCI states that the priority CORESET has (TCI state #1) and a TCI state that the priority CORESET does not have (TCI state #3). If all CORESETs with either of the two TCI states that the preferred CORESET has are monitored, the UE may monitor CORESET#3 with TCI state #1 along with CORESET#1. The UE may not monitor CORESET#3 along with CORESET#1 if all CORESETs with both of the two TCI states that the preferred CORESET has are monitored.
- any other temporally overlapping CORESET may be monitored by the UE using either or both of the two TCI states.
- the UE may monitor PDCCH candidates using either or both TCI states #1 and #2 (forcibly) in at least one of CORESET #2 and #3.
- FIG. 15 is a diagram showing an example of other CORESETs monitored simultaneously with a priority CORESET having only one TCI state.
- three CORESETs (CORESET#1-#3) overlap in time.
- CORESET#1 has one active TCI state (TCI state #1).
- CORESET#2 has one active TCI state (TCI state #1).
- CORESET#3 has two active TCI states (TCI states #1 and #3).
- CORESET#2 has the same TCI state #1 as the priority CORESET has.
- the UE may monitor CORESET#2 with TCI state #1 along with CORESET#1.
- CORESET #3 has TCI state #1 that the priority CORESET has, and TCI state (TCI state #3) that the priority CORESET does not have.
- the UE may monitor CORESET#3 with TCI state #1 along with CORESET#1 if all CORESETs with at least one TCI state with the preferred CORESET are monitored.
- the UE may not monitor CORESET#3 along with CORESET#1 if all CORESETs with only one TCI state that the preferred CORESET has are monitored.
- any other temporally overlapping CORESET may be monitored by the UE using the one TCI state.
- the UE may monitor PDCCH candidates using TCI state #1 (forcibly) in at least one of CORESET #2 and #3.
- a CORESET with two TCI states is preferably of higher priority than a CORESET with one TCI state, so embodiments 1.2 or 1.3 may be adopted.
- Embodiment 1.3 is Rel. 1.3 in that CSS always has higher priority than USS. It may be preferable to embodiment 1.2 because it is the same as the 15/16 precedence rule.
- the priority rule for SFN-PDCCH (SFN-CORESET) (first embodiment) and the priority rule for PDCCH repetition (second embodiment) are the same (or similar) rules are adopted. or different rules may be adopted.
- the UE may determine the prioritized CORESET based on the same priority rule for SFN-PDCCH and PDCCH repetition, or may determine the prioritized CORESET based on different priority rules.
- the priority rule will be the same between SFN-PDCCH and PDCCH repetition. In this case, reduction of the processing load on the UE can be expected.
- a common priority rule is preferably adopted, especially in cases where both SFN-PDCCH and PDCCH repetition are configured within the same BWP/CC/band/frequency range/UE.
- Information about the priority rule for SFN-PDCCH (SFN-CORESET) (for example, information indicating the priority rule to apply), information about the priority rule for PDCCH repetition (for example, information indicating the priority rule to apply), etc. to the UE using physical layer signaling (e.g., Downlink Control Information (DCI)), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, respectively It may be configured or determined based on UE capabilities. Note that if these priority rules are common, one piece of information may be set/determined by the UE.
- DCI Downlink Control Information
- RRC signaling e.g., RRC signaling, MAC CE
- the determination of two QCL-D characteristics for overlapping CORESETs may be determined from the following options. good: Option 1: identify two QCL-D properties based on conventional precedence (Rel. 15/16 precedence rules); - Option 2: Conventional Rel. Determine the first QCL-D characteristic based on a 15/16 precedence rule, then 1 (out of multiple overlapping CORESETs) linked to the SS set with that first QCL-D Identify a second QCL-D according to one of the one or more SS sets. Now, for multiple such SS set pairs, Rel.
- the second QCL-D may be determined according to a 15/16 priority order; • Option 3: Assign the same priority for the two linked SS sets for PDCCH transmissions of overlapping monitoring occasions.
- the priority may be according to whichever of the two linked SS sets has the lower SS set ID.
- SS type USS/CSS
- linkage of SS sets (linked SS sets have higher priority than individual (unlinked) SS sets) > cell index > associated SS set ID.
- Option 1 may correspond to Embodiment 2.1.1, Embodiment 2.1.2.1, and the like.
- Option 2 may correspond to embodiment 2.1.2.2.
- Option 3 may correspond to embodiment 2.3.
- the UE may or may not assume that both PDCCH repetition and SFN-CORESET are set to different CORESETs within the same BWP/CC/band/UE.
- the UE shall perform PDCCH QCL-D collision handling for these PDCCH repetitions.
- priority rule eg, any priority rule described in the second embodiment
- a priority rule for the SFN-CORESET eg, any priority rule described in the first embodiment
- the UE may assume that the priority rule for PDCCH repetition to be configured/determined and the priority rule for SFN-CORESET to be configured/determined are the same (common). In this case, PDCCH repetition in the same symbol and PDCCH QCL-D collision handling for SFN-CORESET will be based on the same priority rule, whichever priority rule is followed.
- the UE is a symbol in which both PDCCH repetitions and SFN-CORESET exist (there may be other CORESETs), and only one of the PDCCH repetitions and SFN-CORESET (there may be other CORESETs) PDCCH QCL-D collision handling may be performed according to different priority rules for symbols in which QCL-D is present.
- the specific UE capabilities may indicate at least one of the following: whether to support the SFN PDCCH repetition scheme (or SFN-PDCCH or SFN-CORESET); whether to support PDCCH repetition; whether to support the SFN PDCCH repetition scheme (or SFN-PDCCH or SFN-CORESET) for CSS sets; whether to support PDCCH repetition for CSS sets; • Whether to support simultaneous reception of two or more different QCL type D PDCCHs.
- At least one of the above embodiments may be applied if the UE is configured by higher layer signaling with specific information related to the above embodiments (if not configured, e.g. Rel. 15/ 16 operations apply).
- the specific information is information indicating that the SFN/FDM PDCCH repetition scheme (or SFN-PDCCH or SFN-CORESET) is enabled, any RRC parameters for a specific release (eg, Rel.17), etc. may be
- the above UE capabilities, specific information, etc. may be commonly configured/reported for SFN-PDCCH and PDCCH repetition, or may be configured/reported separately (by independent parameters).
- the first embodiment is not limited to the case where the UE is configured with (or uses) the SFN PDCCH repetition scheme, but is applicable to the case where one or more TCI states are activated per CORESET.
- the first embodiment may be applied to a case where HST scheme 0/, scheme 1/scheme 2/network pre-compensation (NW pre-compensation) scheme is set to use/UE.
- the second embodiment is not limited to the case where the UE is configured (or uses) the FDM PDCCH repetition scheme, but applies to the case where two SS sets with corresponding multiple CORESETs are used for the PDCCH. It is possible.
- wireless communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.
- FIG. 16 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- LTE Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB)
- gNB NR base stations
- a wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare.
- a user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.
- the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.
- the user terminal 20 may connect to at least one of the multiple base stations 10 .
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)).
- Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- a plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10 .
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication schemes such as LTE, LTE-A, and 5G.
- a radio access scheme based on orthogonal frequency division multiplexing may be used.
- OFDM orthogonal frequency division multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a radio access method may be called a waveform.
- other radio access schemes for example, other single-carrier transmission schemes and other multi-carrier transmission schemes
- the UL and DL radio access schemes may be used as the UL and DL radio access schemes.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (PUSCH) shared by each user terminal 20 an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, higher layer control information, and the like may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource searching for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates.
- a CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- PUCCH channel state information
- acknowledgment information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- SR scheduling request
- a random access preamble for connection establishment with a cell may be transmitted by the PRACH.
- downlink, uplink, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical" to the head.
- synchronization signals SS
- downlink reference signals DL-RS
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc.
- CRS cell-specific reference signal
- CSI-RS channel state information reference signal
- DMRS Demodulation reference signal
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called SS/PBCH block, SS Block (SSB), and so on.
- SS, SSB, etc. may also be referred to as reference signals.
- DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).
- FIG. 17 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- the base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 .
- One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 110 controls the base station 10 as a whole.
- the control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like.
- the control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 .
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 .
- the control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.
- the transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 .
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 .
- the transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.
- the transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of the transmission processing section 1211 and the RF section 122 .
- the receiving section may be composed of a reception processing section 1212 , an RF section 122 and a measurement section 123 .
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 120 may receive the above-described uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.
- channel coding which may include error correction coding
- modulation modulation
- mapping mapping
- filtering filtering
- DFT discrete Fourier transform
- DFT discrete Fourier transform
- the transmitting/receiving unit 120 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .
- the transmitting/receiving unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.
- FFT Fast Fourier transform
- IDFT Inverse Discrete Fourier transform
- the transmitting/receiving unit 120 may measure the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- RSSI Received Signal Strength Indicator
- channel information for example, CSI
- the transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.
- the transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission path interface 140.
- the transmitting/receiving unit 120 transmits at least one physical downlink control channel (PDCCH) in a plurality of temporally overlapping control resource sets (CORESET) to the user terminal 20.
- PDCCH physical downlink control channel
- CORESET temporally overlapping control resource sets
- the control unit 110 controls the PDCCH, which the user terminal 20 monitors for the plurality of CORESETs, according to the transmission configuration indication state (TCI state) of only one CORESET selected based on the priority rule. It may be assumed that a decision-making control is performed.
- TCI state transmission configuration indication state
- FIG. 18 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 .
- One or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 210 controls the user terminal 20 as a whole.
- the control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission/reception, measurement, etc. using the transmission/reception unit 220 and the transmission/reception antenna 230 .
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission/reception unit 220 .
- the transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 .
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 .
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.
- the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of a transmission processing section 2211 and an RF section 222 .
- the receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .
- the transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 220 may transmit the above-described uplink channel, uplink reference signal, and the like.
- the transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.
- Whether or not to apply DFT processing may be based on transform precoding settings. Transmitting/receiving unit 220 (transmission processing unit 2211), for a certain channel (for example, PUSCH), if transform precoding is enabled, the above to transmit the channel using the DFT-s-OFDM waveform
- the DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.
- the transmitting/receiving unit 220 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmitting/receiving section 220 may measure the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like.
- the measurement result may be output to control section 210 .
- the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220 and the transmitter/receiver antenna 230 .
- control unit 210 monitors the PDCCH for the downlink control channel (Physical Downlink Control Channel (PDCCH)) in a plurality of temporally overlapping control resource sets (Control Resource Set (CORESET)) based on the priority rule. It may be determined according to the Transmission Configuration Indication state (TCI state) of only one selected CORESET.
- PDCH Physical Downlink Control Channel
- CORESET Control Resource Set
- the transmitting/receiving unit 220 may monitor the determined PDCCH.
- a CORESET corresponding to a common search space (CSS) set is prioritized over a CORESET corresponding to a UE-specific search space (USS) set. It may be a rule that is determined with priority.
- the priority rule is that, among the plurality of CORESETs, a CORESET corresponding to a Common Search Space (CSS) set having two active TCI states, a UE-specific search space (UE- Specific Search Space (USS)) set, CORESET corresponding to CSS set with one active TCI state, and CORESET corresponding to USS set with one active TCI state.
- CCS Common Search Space
- USS UE- Specific Search Space
- the priority rule is, among the plurality of CORESETs, a CORESET corresponding to a Common Search Space (CSS) set having two active TCI states, a CORESET corresponding to a CSS set having one active TCI state, A rule that determines the CORESET corresponding to the UE-specific Search Space (USS) set with two active TCI states and the CORESET corresponding to the USS set with one active TCI state, in order of priority.
- CCS Common Search Space
- USS UE-specific Search Space
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 19 is a diagram illustrating an example of hardware configurations of a base station and user terminals according to an embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- processor 1001 may be implemented by one or more chips.
- predetermined software program
- the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .
- the processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- FIG. 10 FIG. 10
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.
- the memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one.
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include
- the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may consist of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) that make up a radio frame may be called a subframe.
- a subframe may consist of one or more slots in the time domain.
- a subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve.
- the number of subcarriers included in an RB may be determined based on neumerology.
- an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or more resource blocks.
- One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.
- PRB Physical Resource Block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair RB Also called a pair.
- a resource block may be composed of one or more resource elements (Resource Element (RE)).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP for UL
- BWP for DL DL BWP
- One or multiple BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples.
- the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- information, signals, etc. can be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input and output through multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.
- Uplink Control Information (UCI) Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
- RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of predetermined information is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of
- the determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.
- a “network” may refer to devices (eg, base stations) included in a network.
- precoding "precoding weight”
- QCL Quality of Co-Location
- TCI state Transmission Configuration Indication state
- spatialal patial relation
- spatialal domain filter "transmission power”
- phase rotation "antenna port
- antenna port group "layer”
- number of layers Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel” are interchangeable. can be used as intended.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)). Head (RRH)
- RRH Head
- the terms "cell” or “sector” refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.
- MS Mobile Station
- UE User Equipment
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like. At least one of the base station and the mobile station may be a device mounted on a moving object, the mobile itself, or the like.
- the moving body refers to a movable object, the speed of movement is arbitrary, and it naturally includes cases where the moving body is stationary.
- Examples of such moving bodies include vehicles, transportation vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, and ships (ships and other watercraft). , airplanes, rockets, satellites, drones, multi-copters, quad-copters, balloons and objects mounted on them.
- the mobile body may be a mobile body that autonomously travels based on an operation command.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- a vehicle e.g., car, airplane, etc.
- an unmanned mobile object e.g., drone, self-driving car, etc.
- a robot manned or unmanned .
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- FIG. 20 is a diagram showing an example of a vehicle according to one embodiment.
- a vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, Various sensors (including current sensor 50, rotation speed sensor 51, air pressure sensor 52, vehicle speed sensor 53, acceleration sensor 54, accelerator pedal sensor 55, brake pedal sensor 56, shift lever sensor 57, and object detection sensor 58), information service A unit 59 and a communication module 60 are provided.
- the driving unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor.
- the steering unit 42 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.
- the electronic control unit 49 is composed of a microprocessor 61 , a memory (ROM, RAM) 62 , and a communication port (eg, input/output (IO) port) 63 . Signals from various sensors 50 to 58 provided in the vehicle are input to the electronic control unit 49 .
- the electronic control unit 49 may be called an Electronic Control Unit (ECU).
- ECU Electronic Control Unit
- the signals from the various sensors 50 to 58 include a current signal from the current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46/rear wheels 47 obtained by the rotation speed sensor 51, and an air pressure sensor 52.
- air pressure signal of front wheels 46/rear wheels 47 vehicle speed signal obtained by vehicle speed sensor 53, acceleration signal obtained by acceleration sensor 54, depression amount signal of accelerator pedal 43 obtained by accelerator pedal sensor 55, brake pedal sensor
- the information service unit 59 controls various devices such as car navigation systems, audio systems, speakers, displays, televisions, and radios for providing various types of information such as driving information, traffic information, and entertainment information, and these devices. It is composed of one or more ECUs.
- the information service unit 59 provides various information/services (for example, multimedia information/multimedia services) to the occupants of the vehicle 40 using information acquired from an external device via the communication module 60 or the like.
- the driving support system unit 64 includes millimeter wave radar, Light Detection and Ranging (LiDAR), camera, positioning locator (eg, Global Navigation Satellite System (GNSS), etc.), map information (eg, High Definition (HD)) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., inertial measurement units (IMU), inertial navigation systems (INS), etc.), artificial intelligence ( Artificial intelligence (AI) chips, AI processors, and other devices that provide functions to prevent accidents and reduce the driver's driving load, and one or more devices that control these devices ECU.
- the driving support system unit 64 transmits and receives various information via the communication module 60, and realizes a driving support function or an automatic driving function.
- the communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63 .
- the communication module 60 communicates with the vehicle 40 through a communication port 63 such as a driving unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, Data (information) is transmitted and received between the axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58.
- the communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from an external device via wireless communication.
- Communication module 60 may be internal or external to electronic control 49 .
- the external device may be, for example, the above-described base station 10, user terminal 20, or the like.
- the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (and may function as at least one of the base station 10 and the user terminal 20).
- the communication module 60 may transmit at least one of signals from the various sensors 50 to 58 and information obtained based on the signals input to the electronic control unit 49 to an external device via wireless communication. .
- the communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 provided in the vehicle.
- Communication module 60 also stores various information received from external devices in memory 62 available to microprocessor 61 . Based on the information stored in the memory 62, the microprocessor 61 controls the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, and the left and right rear wheels provided in the vehicle 40. 47, axle 48, and various sensors 50-58 may be controlled.
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the user terminal 20 may have the functions of the base station 10 described above.
- words such as "uplink” and “downlink” may be replaced with words corresponding to communication between terminals (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be read as sidelink channels.
- user terminals in the present disclosure may be read as base stations.
- the base station 10 may have the functions of the user terminal 20 described above.
- operations that are assumed to be performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this may be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG x is, for example, an integer or a decimal number
- Future Radio Access FAA
- RAT New-Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802 .11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, or any other suitable wireless communication method. It may be applied to a system to be used, a next-generation system extended, modified, created or defined based on these.
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.
- determining includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be “determining.”
- determining (deciding) includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.
- determining is considered to be “determining” resolving, selecting, choosing, establishing, comparing, etc. good too. That is, “determining (determining)” may be regarded as “determining (determining)” some action.
- connection refers to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- radio frequency domain when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
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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。
これまでのRel.15/16 NRの仕様においては、UEは、同じ時間において同じQCLタイプDのチャネル/信号のみを受信、検出又はモニタできるが、同じ時間において異なるQCLタイプDの複数のチャネル/信号を受信、検出又はモニタすることはできなかった。このため、複数のチャネル/信号が衝突する(言い換えると、重複する時間に送信/受信される)ケースでは当該複数のチャネル/信号が同じQCLタイプDに該当することを確保するように、又はこのようなケースを回避するように、以下に述べるような制約(優先ルール、QCL適用ルールなどと呼ばれてもよい)が、Rel.15/16 NRの仕様には規定されている。
UEがシングルセル動作を設定されるか、同じ周波数バンドのキャリアアグリゲーションの動作を設定される場合であって、1つ以上のセルのアクティブなDL BWPにおいて同じ又は異なるQCLタイプD特性を有する複数のCORESETにおいて、重複するモニタリング機会でPDCCH候補をモニタする場合には、当該複数のCORESETのうちの、あるCORESETと、当該CORESETと同じQCLタイプD特性を有するCORESETと、のみにおけるPDCCHをモニタする。
Rel.15で規定されるPDCCH/CORESETについては、CORESETプールインデックス(CORESETPoolIndex)なしの1つのTCI状態が、1つのCORESETに設定される。
<第1の実施形態>
第1の実施形態は、SFN PDCCH繰り返しスキームに関する。
実施形態1.1の優先ルールは、Rel.16 NRと同じである。つまり、UEは、CSSセットがUSSセットより優先的にモニタされ、また同じ種類(CSS又はUSS)のSSセット同士ではインデックスの小さい方(つまり、セルインデックスがより小さい方。セルインデックスが同じ場合は、さらに、SSセットインデックスがより小さい方)が優先的にモニタされるという優先ルールに従って、優先CORESETを決定する。
・実施形態1.1.1:優先CORESETが2つのアクティブTCI状態(2つのQCLタイプD)を有する、
・実施形態1.1.2:優先CORESETが1つのアクティブTCI状態(1つのQCLタイプD)を有する。
優先CORESET以外のCORESETであって、1つのアクティブTCI状態を有するCORESETについては、当該1つのアクティブTCI状態が優先CORESETの2つのアクティブTCI状態のいずれかと同じQCLタイプDである場合には、UEはこのCORESETをモニタしてもよい。
(1.1.1a)当該2つのアクティブTCI状態が優先CORESETの2つのアクティブTCI状態と同じQCLタイプDである、
(1.1.1b)当該2つのアクティブTCI状態の1つが優先CORESETの2つのアクティブTCI状態の1つと同じQCLタイプDである。
実施形態1.1.2について、Rel.16 NRと同じ優先ルールに従ってまず決定される1つのアクティブTCI状態を有する優先CORESETのことを、第1の優先CORESETとも呼び、その次に決定される第1の優先CORESET以外の優先CORESETのことを、第2の優先CORESETとも呼ぶ。第2の優先CORESETは、CORESET Xと呼ばれてもよい。
第2の優先CORESETは、第1の優先CORESETを除いた残りの衝突するCORESETから、Rel.16と同様の優先ルールに従って決定されてもよい。つまり、第2の優先CORESETは、残りの衝突するCORESETのうち、もしあれば、CSSセットを含む最小インデックスのセルにおける最小インデックスのCSSセットに対応し、そうでなければ、最小インデックスのセルにおける最小インデックスのUSSセットに対応してもよい。最小のUSSセットインデックスは、重複するPDCCHモニタリング機会における少なくとも1つのPDCCH候補を有する全てのUSSセットにわたって決定される。
UEは、第1の優先CORESETを除いた残りの衝突するCORESETから、まず、2つのアクティブTCI状態を有し、かつそのうちの一方のTCI状態が第1の優先TCI状態と同じであるCORESETのサブセットを決定する。
実施形態1.1.2における優先CORESET(第1の優先CORESET及び第2の優先CORESET)以外のCORESETのモニタについて説明する。
(1.1.2a)当該1つのアクティブTCI状態が第1の優先TCI状態と同じQCLタイプDである、
(1.1.2b)当該1つのアクティブTCI状態が第1の優先TCI状態又は第2の優先TCI状態と同じQCLタイプDである。
(1.1.2c)当該2つのアクティブTCI状態が、第1の優先TCI状態及び第2の優先TCI状態と同じQCLタイプDである、
(1.1.2d)当該2つのアクティブTCI状態の1つが、第1の優先TCI状態と同じQCLタイプDである、
(1.1.2e)当該2つのアクティブTCI状態の1つが、第1の優先TCI状態及び第2の優先TCI状態のいずれかと同じQCLタイプDである。
実施形態1.2の優先ルールは、以下のとおりである:
・ステップ1:衝突するCORESETのうち、2つのアクティブTCI状態を有するCORESETのサブセットがあれば、それらのみに対してRel.16 NRの優先ルールを適用する。優先CORESETが発見されればステップを終了する。そうでない場合、ステップ2に進む。
・ステップ2:ステップ1において優先CORESETが発見されなければ、衝突するCORESETのうち、1つのアクティブTCI状態を有するCORESETのサブセットのみに対してRel.16 NRの優先ルールを適用する。
実施形態1.3の優先ルールは、以下のとおりである:
・ステップ1:衝突するCORESETのうち、2つのアクティブTCI状態を有するCORESETであって、CSSセットを含む最小インデックスのセルにおける最小インデックスのCSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。そうでない場合、ステップ2に進む。
・ステップ2:衝突するCORESETのうち、1つのアクティブTCI状態を有するCORESETであって、CSSセットを含む最小インデックスのセルにおける最小インデックスのCSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。そうでない場合、ステップ3に進む。
・ステップ3:衝突するCORESETのうち、2つのアクティブTCI状態を有するCORESETであって、USSセットを含む最小インデックスのセルにおける最小インデックスのUSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。そうでない場合、ステップ4に進む。
・ステップ4:衝突するCORESETのうち、1つのアクティブTCI状態を有するCORESETであって、USSセットを含む最小インデックスのセルにおける最小インデックスのUSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。
第2の実施形態は、FDM PDCCH繰り返しスキームに関する。なお、第2の実施形態は、FDM PDCCH繰り返しスキームに限られず、非SFNのPDCCH繰り返しスキームに利用されてもよい。
実施形態2.1の優先ルールは、Rel.16 NRと同じである。つまり、UEは、CSSセットがUSSセットより優先的にモニタされ、また同じ種類(CSS又はUSS)のSSセット同士ではインデックスの小さい方(つまり、セルインデックスがより小さい方。セルインデックスが同じ場合は、さらに、SSセットインデックスがより小さい方)が優先的にモニタされるという優先ルールに従って、優先CORESETを決定する。
・実施形態2.1.1:優先CORESETが別のCORESETに関連付けられている、
・実施形態2.1.2:優先CORESETが別のCORESETに関連付けられていない。
UEは、優先CORESETに関連する別のCORESETを、優先CORESETと同時にモニタしてもよい。
(2.1.1a)TCI状態が第1の優先TCI状態と同じQCLタイプDである、
(2.1.1b)TCI状態が第1の優先TCI状態又は第2の優先TCI状態と同じQCLタイプDである。
実施形態2.1.2について、Rel.16 NRと同じ優先ルールに従ってまず決定される優先CORESETのことを、第1の優先CORESETとも呼び、その次に決定される第1の優先CORESET以外の優先CORESETのことを、第2の優先CORESETとも呼ぶ。第2の優先CORESETは、CORESET Xと呼ばれてもよい。
第2の優先CORESETは、第1の優先CORESETを除いた残りの衝突するCORESETから、Rel.16と同様の優先ルールに従って決定されてもよい。つまり、第2の優先CORESETは、残りの衝突するCORESETのうち、もしあれば、CSSセットを含む最小インデックスのセルにおける最小インデックスのCSSセットに対応し、そうでなければ、最小インデックスのセルにおける最小インデックスのUSSセットに対応してもよい。最小のUSSセットインデックスは、重複するPDCCHモニタリング機会における少なくとも1つのPDCCH候補を有する全てのUSSセットにわたって決定される。
UEは、第1の優先CORESETを除いた残りの衝突するCORESETから、まず、別のCORESETに関連付けられており、かつTCI状態が第1の優先TCI状態と同じであるCORESETのサブセットを決定する。
実施形態2.1.2における優先CORESET(第1の優先CORESET及び第2の優先CORESET)及び優先CORESETに関連付けられるCORESET以外のCORESETのモニタについて説明する。
(2.1.2a)TCI状態が第1の優先TCI状態と同じQCLタイプDである、
(2.1.2b)TCI状態が第1の優先TCI状態又は第2の優先TCI状態と同じQCLタイプDである。
実施形態2.2の優先ルールは、以下のとおりである:
・ステップ1:衝突するCORESETのうち、別のCORESETに関連付けられる(言い換えると、別のCORESETとの関連付けを有する)CORESETのサブセットがあれば、それらのみに対してRel.16 NRの優先ルールを適用する。優先CORESETが発見されればステップを終了する。そうでない場合、ステップ2に進む。
・ステップ2:ステップ1において優先CORESETが発見されなければ、衝突するCORESETのうち、別のCORESETとの関連付けを有しないCORESETのサブセットのみに対してRel.16 NRの優先ルールを適用する。
実施形態2.3の優先ルールは、以下のとおりである:
・ステップ1:衝突するCORESETのうち、関連付けを有するCORESETであって、CSSセットを含む最小インデックスのセルにおける最小インデックスのCSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。そうでない場合、ステップ2に進む。
・ステップ2:衝突するCORESETのうち、関連付けを有しないCORESETであって、CSSセットを含む最小インデックスのセルにおける最小インデックスのCSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。そうでない場合、ステップ3に進む。
・ステップ3:衝突するCORESETのうち、関連付けを有するCORESETであって、USSセットを含む最小インデックスのセルにおける最小インデックスのUSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。そうでない場合、ステップ4に進む。
・ステップ4:衝突するCORESETのうち、関連付けを有しないCORESETであって、USSセットを含む最小インデックスのセルにおける最小インデックスのUSSセットに対応するCORESETがあれば、これを優先CORESETとして決定し、ステップを終了する。
[SFN-PDCCHの変形例]
第1の実施形態(SFN-PDCCH)については、常に1つのCORESETだけが選択されてもよい。言い換えると、実施形態1.1.2のように第2の優先CORESETが選択されることがなくてもよい。
実施形態1.1及び実施形態2.1において、優先CORESETは、重複する全てのCORESETのなかから選択されることを想定して説明したが、これに限られない。優先CORESETは、重複する全てのCORESETのうち、2つのTCI状態を有するCORESET(例えば、SFN-CORESET)のなかから(言い換えると、2つのTCI状態を有するCORESETを優先して)、上述の優先ルールに基づいて選択されてもよい。
上述の任意の実施形態においては、(第1/第2の)優先CORESETが選択される。当該優先CORESETが2つのTCI状態を有する場合、当該2つのTCI状態のいずれか又は両方を有する全てのCORESETがUEによってモニタされてもよい。当該優先CORESETが1つのTCI状態だけを有する場合、当該1つのTCI状態を少なくとも有する全てのCORESETがUEによってモニタされてもよいし、当該1つのTCI状態のみを有する全てのCORESETがUEによってモニタされてもよい。
SFN-PDCCHのためには、2つのTCI状態を有するCORESETが、1つのTCI状態を有するCORESETより高い優先度であることが好ましいため、実施形態1.2又は1.3が採用されることが好適である。実施形態1.3は、CSSがUSSより常に高い優先度を有する点でRel.15/16の優先ルールと同じであるため、実施形態1.2より好ましい可能性がある。
・選択肢1:従来の優先順(Rel.15/16の優先ルール)に基づいて2つのQCL-D特性を識別する(identify)、
・選択肢2:従来のRel.15/16の優先ルールに基づいて第1のQCL-D特性を決定し、その後、当該第1のQCL-Dを有するSSセットにリンクされる(複数のオーバーラップするCORESETのなかからの)1つ以上のSSセットのうち1つに従って第2のQCL-Dを識別する。ここで、複数のそのようなSSセットペアについて、Rel.15/16の優先順に従って当該第2のQCL-Dが決定されてもよい、
・選択肢3:オーバーラップするモニタリング機会のPDCCH送信のための2つのリンクされるSSセットのために同じ優先度を割り当てる。当該優先度は、当該2つのリンクされるSSセットのうちのより小さいSSセットIDを有する方に従ってもよい。
なお、上述の実施形態の少なくとも1つは、特定のUE能力(UE capability)を報告した又は当該特定のUE能力をサポートするUEに対してのみ適用されてもよい。
・SFN PDCCH繰り返しスキーム(又はSFN-PDCCH又はSFN-CORESET)をサポートするか否か、
・PDCCH繰り返しをサポートするか否か、
・CSSセットのためのSFN PDCCH繰り返しスキーム(又はSFN-PDCCH又はSFN-CORESET)をサポートするか否か、
・CSSセットのためのPDCCH繰り返しをサポートするか否か、
・2つ以上の異なるQCLタイプDのPDCCHの同時受信をサポートするか否か。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図17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18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)
- 時間的に重複する複数の制御リソースセット(Control Resource Set(CORESET))における下りリンク制御チャネル(Physical Downlink Control Channel(PDCCH))についてモニタするPDCCHを、優先ルールに基づいて選択される1つだけのCORESETの送信設定指示状態(Transmission Configuration Indication state(TCI状態))に従って決定する制御部と、
前記決定されたPDCCHをモニタする受信部と、を有する端末。 - 前記優先ルールは、前記複数のCORESETのうち、共通サーチスペース(Common Search Space(CSS))セットに対応するCORESETを、UE固有サーチスペース(UE-specific Search Space(USS))セットに対応するCORESETより優先して決定するルールである請求項1に記載の端末。
- 前記優先ルールは、前記複数のCORESETのうち、2つのアクティブTCI状態を有する共通サーチスペース(Common Search Space(CSS))セットに対応するCORESET、2つのアクティブTCI状態を有するUE固有サーチスペース(UE-specific Search Space(USS))セットに対応するCORESET、1つのアクティブTCI状態を有するCSSセットに対応するCORESET、1つのアクティブTCI状態を有するUSSセットに対応するCORESET、の優先順で決定するルールである請求項1に記載の端末。
- 前記優先ルールは、前記複数のCORESETのうち、2つのアクティブTCI状態を有する共通サーチスペース(Common Search Space(CSS))セットに対応するCORESET、1つのアクティブTCI状態を有するCSSセットに対応するCORESET、2つのアクティブTCI状態を有するUE固有サーチスペース(UE-specific Search Space(USS))セットに対応するCORESET、1つのアクティブTCI状態を有するUSSセットに対応するCORESET、の優先順で決定するルールである請求項1に記載の端末。
- 時間的に重複する複数の制御リソースセット(Control Resource Set(CORESET))における下りリンク制御チャネル(Physical Downlink Control Channel(PDCCH))についてモニタするPDCCHを、優先ルールに基づいて選択される1つだけのCORESETの送信設定指示状態(Transmission Configuration Indication state(TCI状態))に従って決定するステップと、
前記決定されたPDCCHをモニタするステップと、を有する端末の無線通信方法。 - 時間的に重複する複数の制御リソースセット(Control Resource Set(CORESET))における下りリンク制御チャネル(Physical Downlink Control Channel(PDCCH))の少なくとも1つを端末に送信する送信部と、
前記端末が、前記複数のCORESETについてモニタするPDCCHを、優先ルールに基づいて選択される1つだけのCORESETの送信設定指示状態(Transmission Configuration Indication state(TCI状態))に従って決定する制御を行うと想定する制御部と、を有する基地局。
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