WO2020144775A1 - ユーザ端末及び無線通信方法 - Google Patents

ユーザ端末及び無線通信方法 Download PDF

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Publication number
WO2020144775A1
WO2020144775A1 PCT/JP2019/000392 JP2019000392W WO2020144775A1 WO 2020144775 A1 WO2020144775 A1 WO 2020144775A1 JP 2019000392 W JP2019000392 W JP 2019000392W WO 2020144775 A1 WO2020144775 A1 WO 2020144775A1
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Prior art keywords
transmission
information
pusch
qcl
resource
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PCT/JP2019/000392
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English (en)
French (fr)
Japanese (ja)
Inventor
一樹 武田
聡 永田
リフェ ワン
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株式会社Ｎｔｔドコモ
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Priority to CN201980088577.3A priority Critical patent/CN113302964A/zh
Priority to PCT/JP2019/000392 priority patent/WO2020144775A1/ja
Publication of WO2020144775A1 publication Critical patent/WO2020144775A1/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal

Definitions

  • the present disclosure relates to a user terminal and a wireless communication method in a next-generation mobile communication system.
  • LTE Long Term Evolution
  • 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
  • a successor system to LTE for example, 5th generation mobile communication system (5G), 5G+(plus), New Radio (NR), 3GPP Rel.15 or later) is also under consideration.
  • 5G 5th generation mobile communication system
  • 5G+(plus) 5th generation mobile communication system
  • NR New Radio
  • 3GPP Rel.15 or later 3th generation mobile communication system
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Rel. 15 NR supports beamforming-related operations. So far Rel. 15 The beam considered for NR is assumed to correspond to a narrow beam. When communication is performed using a narrow beam, beam shift (beam mismatch) may cause fatal performance degradation.
  • the use of a wide beam that is more robust than a narrow beam is appropriate for suppressing the above-mentioned mismatch.
  • the method of utilizing such a robust wide beam has not been studied in the NR so far. If this is not clearly specified, the base station and the UE may be inconsistent with respect to the beam-related control, and the communication throughput may be reduced.
  • an object of the present disclosure is to provide a user terminal and a wireless communication method that can appropriately perform beam-related control.
  • a user terminal includes a receiving unit that receives a reference signal, a control unit that selects a plurality of the reference signals, and performs a control of transmitting a random access preamble corresponding to the selected plurality of reference signals. , Are included.
  • beam-related control can be appropriately performed.
  • FIG. 1 is a diagram illustrating an example of a combined beam provided by the present disclosure.
  • FIG. 2 is a diagram showing an example of SSB and PRACH mapping in the first embodiment.
  • FIG. 3 is a diagram showing another example of SSB and PRACH mapping in the first embodiment.
  • FIG. 4 is a diagram showing an example of a TCI state for setting QCL characteristics with the PDCCH in Embodiment 2-1.
  • FIG. 5 is a diagram showing an example of a TCI state for setting QCL characteristics with the PDCCH in Embodiment 2-2.
  • FIG. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
  • FIG. 7 is a diagram illustrating an example of the configuration of the base station according to the embodiment.
  • FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
  • FIG. 9 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment.
  • TCI Transmission Configuration Indication state
  • reception processing for example, reception, demapping, demodulation, It is considered to control at least one of decoding
  • a transmission process for example, at least one of transmission, mapping, precoding, modulation and coding
  • the TCI state may represent what applies to downlink signals/channels.
  • the one corresponding to the TCI state applied to the uplink signal/channel may be expressed as a spatial relation.
  • the TCI state is information related to signal/channel pseudo collocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameter, spatial relation information (Spatial Relation Information (SRI)), or the like.
  • QCL Signal/channel pseudo collocation
  • SRI spatial relation information
  • the TCI state may be set in the UE per channel or per signal.
  • QCL is an index showing the statistical properties of signals/channels. For example, when there is a QCL relationship between a signal/channel and another signal/channel, Doppler shift, doppler spread, average delay (average delay) between these different signals/channels. ), delay spread, and spatial parameter (for example, spatial reception parameter (spatial Rx parameter)) are the same (meaning that at least one of them is QCL). You may.
  • the spatial reception parameter may correspond to the reception beam (for example, reception analog beam) of the UE, and the beam 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 A plurality of types (QCL types) may be defined as the QCL.
  • QCL types A-D four QCL types A-D with different parameters (or parameter sets) that can be assumed to be the same may be provided, which parameters are shown below: QCL type A: Doppler shift, Doppler spread, average delay and delay spread, ⁇ QCL Type B: Doppler shift and Doppler spread, QCL type C: Doppler shift and average delay, QCL type D: spatial reception parameter.
  • CORESET Control Resource Set
  • QCL assumption QCL assumption
  • the UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal/channel based on the TCI state of the signal/channel or the QCL assumption.
  • the TCI state is, for example, a target channel (or a reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another downlink reference signal (DL-RS)). It may be information about QCL.
  • the TCI state may be set (instructed) by upper layer signaling, physical layer signaling, or a combination thereof.
  • the upper layer signaling may be, for example, any of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or the like, or a combination thereof.
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • Broadcast information includes, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), minimum system information (Remaining Minimum System Information (RMSI)), and other system information ( Other System Information (OSI)) may be used.
  • MIB Master Information Block
  • SIB System Information Block
  • RMSI Remaining Minimum System Information
  • OSI Other System Information
  • the physical layer signaling may be downlink control information (Downlink Control Information (DCI)), for example.
  • DCI Downlink Control Information
  • the channel for which the TCI state is set is, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and an uplink shared channel (Physical Uplink Shared Channel (PUSCH) )), and at least one of the Uplink Control Channel (Physical Uplink Control Channel (PUCCH)).
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Downlink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the RS having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), or a measurement reference signal (Sounding). It may be at least one of Reference Signal (SRS).
  • SSB Synchronization Signal Block
  • CSI-RS Channel State Information Reference Signal
  • Sounding a measurement reference signal
  • SRS Reference Signal
  • SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)).
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH Physical Broadcast Channel
  • SSB may be referred to as SS/PBCH block.
  • the TCI state information element (“TCI-state IE” of RRC) set by upper layer signaling may include one or more pieces of QCL information (“QCL-Info”).
  • the QCL information may include at least one of information regarding DL-RS (DL-RS related information) having a QCL relationship and information indicating a QCL type (QCL type information).
  • the DL-RS related information includes a DL-RS index (eg, SSB index, non-zero power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID), an index of a cell in which the RS is located, and RS.
  • Information such as the index of the Bandwidth Part (BWP) located may be included.
  • TCI state for PDCCH The information on the PDCCH (or the demodulation reference signal (DMRS) antenna port related to the PDCCH) and the QCL with a predetermined DL-RS may be called the TCI state for the PDCCH or the like.
  • DMRS demodulation reference signal
  • the UE may determine the TCI state for the UE-specific PDCCH (CORESET) based on higher layer signaling. For example, one or a plurality (K) of TCI states may be set for the UE for each CORESET by RRC signaling.
  • CORESET UE-specific PDCCH
  • the UE may also activate the TCI state according to MAC CE for each CORESET.
  • the MAC CE may be referred to as a UE-specific PDCCH TCI state indication MAC CE (TCI State Indication for UE-specific PDCCH MAC CE).
  • the UE may monitor CORESET based on the active TCI state corresponding to the CORESET.
  • TCI state for PDSCH The information on the PDSCH (or DMRS antenna port associated with the PDSCH) and the QCL with a given DL-RS may be referred to as the TCI state for the PDSCH and so on.
  • the UE may be notified (set) of M (M ⁇ 1) TCI states for PDSCH (QCL information for M PDSCHs) by higher layer signaling.
  • the number M of TCI states set in the UE may be limited by at least one of the UE capability and the QCL type.
  • the DCI used for PDSCH scheduling may include a predetermined field indicating the TCI status for the PDSCH (may be called a TCI field, a TCI status field, etc.).
  • the DCI may be used for PDSCH scheduling of one cell, and may be called, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1_1.
  • Whether the TCI field is included in the DCI may be controlled by the information notified from the base station to the UE.
  • the information may be information (TCI-PresentInDCI) indicating whether or not a TCI field is present in DCI (present or absent).
  • TCI-PresentInDCI information indicating whether or not a TCI field is present in DCI (present or absent).
  • the information may be set in the UE by upper layer signaling, for example.
  • MAC CE may be used to activate (or specify) eight or less types of TCI states.
  • the MAC CE may be referred to as TCI States Activation/Deactivation for UE-specific PDSCH MAC CE for UE-specific PDSCH TCI state activation/deactivation MAC CE.
  • the value of the TCI field in DCI may indicate one of the TCI states activated by MAC CE.
  • the UE is RS in the TCI state for the QCL type parameter given by the TCI state indicated by the DCI.
  • the DMRS port of PDSCH of the serving cell is QCL ("the DM-RS ports of PDSCH of a serving cell are quasi co-located with the RS(s) in the TCI state with respect to the QCL type parameter(s) It may be assumed that given by the indicated TCI state”).
  • the time offset between the reception of DL DCI and the reception of PDSCH corresponding to the DCI may be referred to as a scheduling offset.
  • the above-mentioned predetermined threshold is called “Threshold”, “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI”, “Threshold-Sched-Offset”, schedule offset threshold, scheduling offset threshold, etc.
  • the scheduling offset threshold may be based on the UE capability, for example, the delay required for PDCCH decoding and beam switching.
  • the information of the scheduling offset threshold may be set from the base station using higher layer signaling, or may be transmitted from the UE to the base station.
  • the UE When the scheduling offset is less than the scheduling offset threshold, the UE corresponds to the smallest CORESET-ID in the latest (latest) slot in which one or more CORESETs are set in the UE in the active BWP of the serving cell.
  • the RS in the TCI state regarding the QCL parameter used for the PDCCH QCL indication and the DMRS port of the PDSCH of the serving cell are QCL (the DM-RS ports of PDSCH of a serving cell are quasi co-located with the RS( s) in the TCI state with respect to the QCL parameter(s) used for PDCCH quasi co-location indication of the lowest CORESET-ID in the latest slot in which one of the more CORESETs within in the active BWP of.
  • the UE may be assumed.
  • the UE may assume that the DMRS port of the PDSCH is DL-RS and QCL based on the TCI state activated for CORESET corresponding to the minimum CORESET-ID.
  • the latest slot may be, for example, the slot that receives the DCI that schedules the PDSCH.
  • CORESET-ID may be an ID (ID for identifying CORESET) set by the RRC information element "ControlResourceSet”.
  • Spatial relation information for PUCCH/SRS> Spatial relationship information between the predetermined RS and PUCCH (“PUCCH-SpatialRelationInfo” information element of RRC) may be included in PUCCH configuration information (“PUCCH-Config” information element of RRC). Spatial relation information (“SRS-SpatialRelationInfo” information element of RRC) between a predetermined RS and SRS may be included in SRS resource setting information (“SRS-Resource” information element of RRC).
  • the spatial relationship information may include at least one of SSB index, CSI-RS resource ID, and SRS resource ID as the index of the predetermined RS. Further, these spatial relationship information may include a serving cell index, a BWP index (BWP ID), etc. corresponding to the predetermined RS.
  • BWP ID BWP index
  • the SSB index, the SSB resource ID, and the SSB Resource Indicator may be replaced with each other.
  • the CSI-RS index, CSI-RS resource ID, and CSI-RS Resource Indicator may be read as each other.
  • the SRS index, SRS resource ID and SRI may be read as each other.
  • the UE uses the same spatial domain filter for receiving the SSB or CSI-RS as the PUCCH ( SRS) may be transmitted. That is, in this case, the UE may assume that the UE receive beam of SSB or CSI-RS and the UE transmit beam of PUCCH (SRS) are the same.
  • the UE When the UE is configured with the spatial relationship information regarding the SRS and the PUCCH (another SRS), the UE transmits the PUCCH (another SRS) by using the same spatial domain filter for transmitting the SRS. You may. That is, in this case, the UE may assume that the UE transmission beam of SRS and the UE transmission beam of PUCCH (another SRS) are the same.
  • the spatial domain filter for transmission of the base station, the downlink spatial domain transmission filter, and the transmission beam of the base station may be read as each other.
  • the spatial domain filter for reception of the base station, the uplink spatial domain receive filter, and the reception beam of the base station may be read as each other.
  • the spatial domain filter for transmission of the UE, the uplink spatial domain transmission filter, and the transmission beam of the UE may be read as each other.
  • the spatial domain filter for reception of the UE, the downlink spatial domain receive filter, and the reception beam of the UE may be replaced with each other.
  • PUCCH spatial relation activation/deactivation MAC CE PUCCH spatial relation activation/deactivation MAC CE
  • PUCCH spatial relation activation/deactivation MAC CE PUCCH spatial relation activation/deactivation MAC CE
  • One PUCCH spatial relationship is controlled to be active.
  • the MAC CE may include at least one piece of information such as a target serving cell ID, BWP ID, PUCCH resource ID, and PUCCH spatial relationship information ID.
  • the spatial relationship information for PUSCH may be determined based on an SRS Resource Indicator (SRI) field included in DCI.
  • SRI SRS Resource Indicator
  • the UE may transmit the PUSCH using the same transmission beam as the corresponding SRS among the SRSs set in the higher layer based on the designated SRI.
  • SRS Resource Indicator SRI
  • SRI Spatial Relation Information
  • Rel. 15 NR supports beamforming related operations.
  • the UE identifies (or detects) one SSB (or one CSI-RS) that defines a cell (or is cell-specific) and associates it with a random number associated with the one SSB (or one CSI-RS).
  • An access channel Physical Random Access Channel (PRACH)
  • PRACH Physical Random Access Channel
  • the UE may receive the PDCCH using CORESET associated with the one SSB (or one CSI-RS) or may receive the PDCCH using one active TCI state.
  • the UE may receive the PDSCH on the basis of PDSCH and CORESET which is QCL, or may receive the PDSCH using one active TCI state.
  • the UE may transmit the PUCCH based on PUCCH and CORESET which is QCL, or may transmit the PUCCH using one active spatial relation information (Spatial Relation Information (SRI)).
  • SRI Spatial Relation Information
  • the UE may transmit the PUSCH based on CORESET which is the PUSCH and QCL, or may transmit the PUSCH using one active SRI.
  • based on CORESET that is X and QCL may mean, for example, “assuming that X is the CORESET and QCL,” or "based on the received beam of the CORESET.” May mean.
  • beam shift beam mismatch
  • eMBB enhanced Mobile Broadband
  • mMTC massive Machine Type Communications
  • URLLC Low-Latency Communications
  • NR has not examined how to use such a robust wide beam. If this is not clearly specified, the base station and the UE may be inconsistent with respect to the beam-related control, and the communication throughput may be reduced.
  • the present inventors use a beam having a plurality of RSs corresponding to the QCL type (which may be referred to as a beam obtained by combining the beams of each RS or a combined beam) as a wide beam.
  • the UE performs the reception process on all the beams of each of the plurality of RSs, so that an effect of receiving a wide beam can be obtained.
  • FIG. 1 is a diagram showing an example of a synthetic beam provided by the present disclosure.
  • a transmission/reception point (TRP) (for example, a base station) transmits a beam to the UE.
  • TRP transmission/reception point
  • the beam for RS#1 (the beam applied to RS#1) and the beam for RS#2 are different. From the UE's point of view, it may be assumed that RS#1 and #2 are being transmitted using a beam across RS#1, #2 as shown.
  • SSB is replaced with “at least one of SSB and CSI-RS”
  • DL RS may include at least one of SSB, CSI-RS, and other reference signals
  • a plurality of SSBs may be read as "at least one of a plurality of SSBs and a plurality of CSI-RSs (including a combination of one or more SSBs and one or more CSI-RSs)".
  • the first embodiment relates to the relationship between SSB and PRACH. For example, one-to-one mapping in which one SSB corresponds to one PRACH resource and many-to-one mapping in which a plurality of SSBs correspond to one PRACH resource can be considered.
  • the UE may select one SSB for at least one of initial access and random access, and transmit the PRACH using the PRACH resource associated with the selected SSB.
  • the PRACH may be replaced with a random access preamble.
  • reception power for example, Reference Signal Received Power (RSRP)
  • reception quality for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), and Signal to Noise. Ratio (SNR)
  • signal strength for example, Received Signal Strength Indicator (RSSI)
  • RSSI Received Signal Strength Indicator
  • the UE specifies the PRACH resource using at least one of the PRACH time and frequency resources, the PRACH preamble sequence, the PRACH index (preamble index), and the PRACH setting ID. Good.
  • the PRACH resource in this disclosure may be replaced with these parameters (such as a preamble index) for identifying the PRACH resource.
  • the UE selects one SSB or multiple SSB sets (a set of SSBs) for at least one of initial access and random access. Then, when the UE selects one SSB, the PRACH may be transmitted using the PRACH resource associated with the selected SSB. When the UE selects multiple SSB sets, the PRACH may be transmitted using PRACH resources associated with the selected multiple SSB sets.
  • the UE When the UE finds more than one SSB of sufficient quality (when at least one of RSRP, RSRQ, RSSI, SINR etc. is greater than a predetermined threshold), it selects a set of SSBs containing these SSBs. You may.
  • the UE may set (or indicate) not only the PRACH resource associated with one SSB but also the PRACH resource associated with a set of multiple SSBs by upper layer signaling, physical layer signaling, or a combination thereof.
  • FIG. 2 is a diagram showing an example of SSB and PRACH mapping in the first embodiment.
  • PRACH resources #0, #1, #2 and #3 are associated one-to-one with SSBs #0, #1, #2 and #3, respectively.
  • PRACH resource #4 is associated with SSB #0 and #1. Also, the PRACH resource #5 is associated with SSBs #1 and #2. PRACH resource #6 is associated with SSB #2 and #3. PRACH resource #7 is associated with SSB #3 and #0.
  • PRACH is transmitted using one of the PRACH resources #0 to #3 corresponding to the one SSB.
  • the UE When the UE determines that two of the SSBs #0-#3 have sufficient quality, the UE transmits the PRACH using one of the PRACH resources #4-#7 corresponding to the two SSBs.
  • the number of SSBs related to one PRACH may be more than two.
  • the UE may select a set of SSBs for at least one of initial access and random access even when one-to-one mapping is set.
  • the UE may transmit a plurality of PRACHs using PRACH resources associated with each of the selected plurality of SSB sets.
  • the UE can transmit PRACHs for a plurality of SSBs based on the one-to-one mapping even if the many-to-one mapping of SSB and PRACH is not set.
  • the PRACHs transmitted on the PRACH resources corresponding to each SSB may be associated.
  • the UE selects the first SSB and second SSB set at least one of the preamble sequence and the PRACH time-frequency resource transmitted on the PRACH resource corresponding to the first SSB is the second It may be associated with at least one of the sequence of preambles transmitted on the PRACH resource corresponding to the SSB and the time frequency resource of the PRACH.
  • FIG. 3 is a diagram showing another example of SSB and PRACH mapping in the first embodiment.
  • PRACH resources #0, #1, #2 and #3 are associated one-to-one with SSBs #0, #1, #2 and #3, respectively.
  • the UE when the UE determines that two of the SSBs #0-#3 have sufficient quality, the UE transmits two PRACHs using the PRACH resources #0-#3 corresponding to the two SSBs, respectively. ..
  • a transmission beam to be applied to PRACH transmission using PRACH resources corresponding to each of the multiple SSB may be applied.
  • the UE combines the beam used for transmitting the PRACH resource #4 related to SSB#0 and the beam used for transmitting the PRACH resource #1 related to SSB#1 with the transmission of the PRACH resource #4 of FIG. A beam may be used.
  • the UE When the UE determines that SSB#0 and #1 are of sufficient quality in FIG. 3, the UE transmits the beam used for transmitting PRACH resource #0 related to SSB#0 and the PRACH resource #1 related to SSB#1. Both of these PRACH resources #0 and #1 may be transmitted using a beam obtained by combining the beams used for.
  • the UE may be controlled so that selection of a plurality of SSB sets or transmission using PRACH resources is performed within a predetermined period.
  • the predetermined period may be, for example, a period after selecting one SSB.
  • the predetermined period may be a period from the transmission of a certain PRACH to the start of a random access response (RAR) window for the PRACH.
  • RAR random access response
  • the predetermined period may be set by upper layer signaling or the like.
  • the base station may assume that both SSB#0 and SSB#1 are determined to be of sufficient quality in the UE.
  • the base station appropriately understands that the multiple PRACHs indicate selection of multiple SSB sets. it can.
  • the PRACH transmission power using one or multiple PRACH resources corresponding to the multiple SSB sets is the path loss estimated using the multiple SSB sets. It may be determined based on the value PL.
  • the path loss value used for determining the PRACH transmission power may be a specific value based on a plurality of path loss values estimated by each of the plurality of SSBs.
  • the specific value may be the maximum value of the plurality of path loss values, may be the minimum value of the plurality of path loss values, or may be an average value of the plurality of path loss values. It may be an arbitrary value between the minimum value and the maximum value, or may be an arbitrary value of the plurality of path loss values.
  • the base station transmits a PDCCH (DCI) for scheduling RAR for the PRACH, and transmits the RAR on the PDSCH. May be.
  • the UE may assume that the PDCCH and the RAR (PDSCH) have the same QCL characteristics as the selected SSBs (following the same QCL assumption).
  • the UE After receiving the RAR, the UE transmits the PUSCH according to the UL grant field included in the RAR.
  • the UE may transmit the PUSCH using the same QCL (which may be referred to as an SRI or a transmission filter) used for the above-mentioned one or more PRACH transmissions.
  • the PUSCH may include Message 3.
  • the UE can suitably transmit the PRACH in response to the combined beam across a plurality of RSs.
  • the PRACH may be transmitted using a combined beam.
  • the second embodiment relates to reception of PDCCH.
  • the UE may be configured with one or more TCI states for CORESET.
  • the second embodiment is broadly divided into: one active TCI state for a certain CORESET (embodiment 2-1), more than one active TCI state for a certain CORESET is allowed. (Embodiment 2-2).
  • At least one of the configured TCI states may include either or both of more than one RS for QCL type A and more than one RS for QCL type D (in other words , May be associated with).
  • the one TCI state may be active after the RRC connection. If more than one TCI state is set, any of the more than one TCI state may be activated using MAC CE.
  • a TCI state contains more than one RS for QCL type A or D, and the TCI state is active in CORESET, the UE shall indicate that the DMRS for the PDCCH of the CORESET is the corresponding QCL type. , It may be assumed that all RSs in the TCI state have the same QCL characteristics.
  • the DMRS for the PDCCH having the same QCL characteristics as the plurality of RSs may mean that the UE receives the DMRS (and the PDCCH) based on the QCL characteristics of the plurality of RSs. .. In other words, the UE may assume in RESET that the DMRS antenna port associated with PDCCH reception is QCL with respect to the plurality of RSs and the QCL characteristics.
  • FIG. 4 is a diagram showing an example of a TCI state for setting QCL characteristics with the PDCCH in the embodiment 2-1.
  • TCI state #0 is shown to have QCL characteristics of RS#1 and QCL types A and D.
  • TCI state #1 indicates that it has QCL characteristics of RS#2 and QCL types A and D.
  • TCI state #2 indicates that it has QCL characteristics of QCL types A and D with both RS #1 and #2.
  • the base station transmission beam that the UE can assume when applied to the RS of FIG. 4 will be described using FIG. 1 already shown.
  • the UE may assume that different beams are applied for each TCI state. It may be assumed that the UE transmits RS#1 in TCI state #0 and RS#2 in TCI state #1 using different beams.
  • the UE may assume that the beam applied to the TCI state corresponding to a plurality of RSs corresponds to a beam that combines the beams of each RS (combined beam).
  • the beam extending over RS#1 and #2 shown in FIG. 1 (the beam applied to TCI state #2) is a combined beam of the beam applied to RS#1 and the beam applied to RS#2. It may be assumed to be based.
  • the configured TCI state may include either or both of up to one RS for QCL type A and up to one RS for QCL type D (in other words, associated with each other). May be).
  • one TCI state may be active, or more than one TCI state may be active.
  • a given MAC CE may instruct to activate more than one TCI state for a certain CORESET.
  • the UE may activate more than one TCI state for a certain CORESET according to the given MAC CE received.
  • the predetermined MAC CE may be the same as the existing UE-specific PDCCH TCI status indication MAC CE, or may be a MAC CE that is expanded or modified.
  • the predetermined MAC CE may include a bitmap for indicating an activated (or active) TCI state.
  • a given MAC CE may instruct to activate one TCI state for a certain CORESET.
  • the UE may assume that once activated, the TCI state remains active unless deactivated (eg, MAC CE is used to indicate that the TCI state is not active). Even if the UE assumes that the activated TCI state remains active unless another TCI state is activated (for example, unless the MAC CE is used to instruct activation of a different TCI state). Good.
  • TCI state #0 is activated by the first MAC CE and then TCI state #1 is activated by the second MAC CE, both TCI states #0 and #1 are active.
  • the UE shall indicate that the DMRS for the PDCCH of the CORESET has the same QCL as all RSs in all active TCI states for the CORESET for the corresponding QCL type. It may be assumed to have characteristics.
  • FIG. 5 is a diagram showing an example of a TCI state for setting QCL characteristics with the PDCCH in the embodiment 2-2.
  • TCI state #0 is shown to have QCL characteristics of RS#1 and QCL types A and D.
  • TCI state #1 indicates that it has QCL characteristics of RS#2 and QCL types A and D.
  • the base station transmit beam that the UE can assume when applied to the RS of FIG. 5 may be explained using FIG. 1 already shown.
  • TCI state #0 is active
  • TCI state #1 is active
  • both TCI states #0 and #1 are active. If both TCI states #0 and #1 are active, the UE may receive the PDCCH based on RS #1 and #2.
  • the UE can preferably receive the PDCCH in response to the combined beam across a plurality of RSs.
  • the PDCCH may be transmitted using a combined beam.
  • the third embodiment relates to PDSCH reception.
  • the UE has no upper layer parameter (“tci-PresentInDCI”) indicating that the TCI exists in the DCI (in other words, not valid), or the time difference between the PDCCH (DCI) scheduling the PDSCH and the PDSCH. If is smaller than a predetermined threshold (for example, the above-mentioned scheduling offset threshold), it may be assumed that the PDSCH is CORESET and QCL having the smallest CORESET-ID of the latest slot.
  • a predetermined threshold for example, the above-mentioned scheduling offset threshold
  • the DCI in the third embodiment may be DL DCI.
  • the UE is configured with an upper layer parameter (“tci-PresentInDCI”) indicating that TCI exists in DCI (in other words, valid), and the time difference between the PDCCH (DCI) scheduling PDSCH and the PDSCH is If the PDSCH is not smaller than a predetermined threshold (for example, the scheduling offset threshold described above), it may be assumed that the PDSCH is the RS and QCL in the TCI state indicated by the TCI field included in the DCI.
  • a predetermined threshold for example, the scheduling offset threshold described above
  • the TCI field may be configured (or set) so as to indicate a plurality of TCI states.
  • the TCI field may indicate one TCI state.
  • a TCI state may include (or in other words be associated with) either or both of more than one RS for QCL type A and more than one RS for QCL type D.
  • the UE replaces the “active TCI state” of the above-described second embodiment with “TCI state indicated by the TCI field of DCI”, and “PDCCH” with “PDSCH”. You may perform the control corresponding to the replaced content.
  • the UE shall have a DMRS for PDSCH in the above TCI state for the corresponding QCL type. It may be assumed that all RSs have the same QCL characteristics.
  • the UE assumes that the DMRS for PDSCH has the same QCL characteristics for all corresponding QCL types as all RSs in all the multiple TCI states. May be.
  • the UE can preferably receive the PDSCH in response to the combined beam across multiple RSs.
  • the PDSCH may be transmitted using a combined beam.
  • the fourth embodiment relates to PUSCH transmission.
  • Embodiment 4-1 PUSCH scheduled by UL grant of RAR
  • Embodiment 4-2 Retransmission of UL grant PUSCH of RAR (PUSCH of embodiment 4-1) scheduled by DCI format 0_0
  • Embodiment 4-3 PUSCH scheduled by DCI format 0_0 after acquisition of dedicated PUCCH resource setting
  • Embodiment 4-4 PUSCH scheduled by DCI format 0_1 without SRI (SRS Resource Indicator) field
  • Embodiment 4-5 SRS resource indicator (RRC parameter “srs-ResourceIndicator”) is set in PUSCH scheduled by DCI format 0_1 with SRI field or in configured configured grant (RRC information element “ConfiguredGrantConfig”) Made Configured PUSCH.
  • the PUSCH in each embodiment may be replaced with the corresponding PUSCH described above.
  • the DCI formats 0_0 and 0_1 may be replaced with the DCIs for PUSCH scheduling.
  • the DCI format 0_0 may correspond to DCI whose included field does not depend on the setting of RRC or DCI common to UEs.
  • the DCI format 0_1 may correspond to DCI in which the included field depends on the setting of RRC or DCI for each UE.
  • the UE may apply the same spatial relationship (or SRI) to PUSCH as it applies to PRACH transmission.
  • the UE may determine the spatial relationship based on the one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the UE determines the transmission power of the PUSCH based on the path loss value PL estimated using one or more DL RSs (for example, one or more SSBs) used to determine the PRACH resource. You may. That is, the UE may use the DL RS to estimate the PL for PUSCH power control.
  • DL RSs for example, one or more SSBs
  • the PRACH transmission before the PUSCH scheduled by the UL grant of the RAR may be associated with more than one SSB.
  • the DL RS that appears in all of the fourth embodiments may correspond to a plurality of RSs that are transmitted using the combined beam.
  • the UE may apply any preferred spatial relationship (or SRI) for PUSCH to PUSCH (ie, the UE may autonomously determine the spatial relationship used for PUSCH). .. In this case, the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using one or more DL RSs used to determine the PRACH resource. Alternatively, the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated by using the DL RS related to the spatial relationship for the PUSCH.
  • SRI preferred spatial relationship
  • the UE may apply the same spatial relationship (or SRI) to PUSCH as it applies to PRACH transmission.
  • the UE transmits the PUSCH based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the power may be determined.
  • the UE may apply the same spatial relationship (or SRI) to the PUSCH as applied to the initial transmission of this PUSCH.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using one or more DL RSs used to determine the PRACH resource.
  • the UE may use the DL RS used for the path loss estimation for the power control of the initial transmission of the PUSCH for the path loss estimation for the transmission power control of the PUSCH.
  • the UE may apply any preferred spatial relationship (or SRI) for PUSCH to PUSCH.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using one or more DL RSs used to determine the PRACH resource.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated by using the DL RS related to the spatial relationship for the PUSCH.
  • the UE may apply the same spatial relationship (or SRI) to the PUSCH as it applies to the particular PUCCH resource.
  • the specific PUCCH resource may be, for example, a PUCCH resource having the smallest ID (PUCCH resource ID).
  • the UE transmits the PUSCH based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the power may be determined.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using the DL RS related to the specific PUCCH resource.
  • the UE may apply the same spatial relationship (or SRI) to PUSCH as it applies to a particular SRS resource.
  • the specific SRS resource may be, for example, an SRS resource having the smallest ID (SRS resource ID).
  • the UE transmits the PUSCH based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the power may be determined.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using the DL RS related to the specific SRS resource.
  • the UE may apply the same spatial relationship (or SRI) to PUSCH as it applies to a particular SRS resource set.
  • the specific SRS resource set may be, for example, an SRS resource set having the smallest ID (SRS resource set ID).
  • the UE transmits the PUSCH based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the power may be determined.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using the DL RS related to the specific SRS resource set.
  • the UE may apply the same spatial relationship (or SRI) to the PUSCH as it applies to the particular PUCCH resource.
  • the specific PUCCH resource may be, for example, a PUCCH resource having the smallest ID (PUCCH resource ID).
  • the UE transmits the PUSCH based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the power may be determined.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using the DL RS related to the specific PUCCH resource.
  • the UE may apply the same spatial relationship (or SRI) to PUSCH as it applies to a particular SRS resource.
  • the specific SRS resource may be, for example, an SRS resource having the smallest ID (SRS resource ID).
  • the UE transmits the PUSCH based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the power may be determined.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using the DL RS related to the specific SRS resource.
  • the UE may apply the same spatial relationship (or SRI) to PUSCH as it applies to a particular SRS resource set.
  • the specific SRS resource set may be, for example, an SRS resource set having the smallest ID (SRS resource set ID).
  • the UE transmits the PUSCH based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) used to determine the PRACH resource.
  • the power may be determined.
  • the UE may determine the transmission power of the PUSCH based on the path loss value PL estimated using the DL RS related to the specific SRS resource set.
  • the UE indicates the spatial relationship (indicated by the SRI field included in the DCI format 0_1 or set by the SRS resource indicator (“srs-ResourceIndicator”) included in the configuration of the configured grant ( Alternatively, SRI) may be applied to PUSCH.
  • SRI SRS resource indicator
  • the UE may have one or more DL RSs (eg, associated with the spatial relationship (or SRI) pointed to by the SRI field of the DCI or set by the SRS resource indicator of the configured grant configuration (eg, The transmission power of the PUSCH may be determined based on the path loss value PL estimated using one or a plurality of SSBs.
  • DL RSs eg, associated with the spatial relationship (or SRI) pointed to by the SRI field of the DCI or set by the SRS resource indicator of the configured grant configuration
  • the transmission power of the PUSCH may be determined based on the path loss value PL estimated using one or a plurality of SSBs.
  • the UE may use the precoder for SRS as a precoder for PUSCH (transmission precoder). That is, the precoder for PUSCH may be determined based on the spatial relationship (or SRI) indicated by the SRI field of the DCI or set by the SRS resource indicator of the configured grant configuration.
  • the UE may determine (or calculate) a precoder for SRS based on the measurement of one or more associated DL RSs (SSB, CSI-RS, etc.).
  • SSB DL RSs
  • CSI-RS CSI-RS
  • more than one NZP CSI-RS (or SSB) may be set for each SRS resource set, or one SRI value may indicate more than one SRS resource (or SRS resource set). Good.
  • the UE shall have NZP CSI-RS (or more than one corresponding NZP CSI-RS) precoded SRS resources.
  • the precoder for that SRS may be determined to be associated with more SSB).
  • the UE For PUSCH transmission, when the spatial relationship (or SRI) indicated by the SRI field of the DCI or set by the SRS resource indicator of the configured grant indicates more than one SRS resource (or SRS resource set) , The UE is such that the pre-coded PUSCH is associated with more than one SRS resource (or SRS resource set), ie more than one NZP CSI-RS (or corresponding more than one SSB). Alternatively, the PUSCH precoder may be determined.
  • the transmission power of PUSCH is determined based on the path loss value PL estimated using one or more DL RSs (eg, one or more SSBs) associated with the SRS resource (or SRS resource set). May be.
  • the path loss value used for determining the PUSCH transmission power described in the fourth embodiment may be a specific value based on the plurality of path loss values estimated by the plurality of DL RSs.
  • the specific value may be the maximum value of the plurality of path loss values, may be the minimum value of the plurality of path loss values, or may be an average value of the plurality of path loss values. It may be an arbitrary value between the minimum value and the maximum value, or may be an arbitrary value of the plurality of path loss values.
  • the UE can preferably transmit the PUSCH in response to the combined beam across multiple RSs.
  • the PUSCH may be transmitted using a combined beam.
  • the fifth embodiment relates to PUCCH transmission.
  • Embodiment 5-1 PUCCH before RRC setting of PUCCH spatial relation information (“PUCCH-SpatialRelationInfo” information element) is available
  • Embodiment 5-2 PUCCH after the RRC setting (“PUCCH-SpatialRelationInfo” information element) of the spatial relation information of PUCCH is available.
  • the PUCCH in each embodiment may be replaced with the corresponding PUCCH described above.
  • Embodiment 5-1 the UE applies the same spatial relationship (or SRI) to the PUCCH as that applied to PUSCH (and thus PRACH corresponding to the RAR) transmission scheduled by the UL grant of the RAR. Good.
  • a spatial domain transmit filter for PUCCH transmissions may be associated with more than one CSI-RS (or corresponding more than one SSB). For a PUCCH transmission, if the number of associated SSB/CSI-RS resources is more than one, the UE shall precode the PUCCH so that the precoded PUCCH is associated with more than one SSB/CSI-RS. May be determined.
  • the spatial relation information of the PUCCH (“PUCCH-SpatialRelationInfo” information element) provides one or more SSB indexes (“ssb-index”) (that is, the UE has one or more SSB indexes). If the spatial relationship information regarding the SSB and the PUCCH is set), the PUCCH is transmitted using the same spatial domain filter that is applied to the reception of the SSB corresponding to the one or more SSB indexes. Good.
  • the PUCCH spatial relationship information (“PUCCH-SpatialRelationInfo” information element) has one or more CSI-RS resource indexes (“csi-RS-Index”/“NZP-CSI-RS-ResourceId”). ]) is provided (that is, the UE is configured with spatial relationship information regarding one or more CSI-RSs and the PUCCH), the CSI corresponding to the resource index of the one or more CSI-RSs.
  • the PUCCH may be transmitted using the same spatial domain filter applied to the reception of the RS.
  • spatial relationship information of PUCCH (“PUCCH-SpatialRelationInfo” information element) provides one or more SRS resource indexes (“SRS-ResourceId” included in “srs”) (that is, If the UE is configured with spatial relationship information about one or more SRSs and the PUCCH), the same spatial domain filter applied to the transmission of the SRSs corresponding to the resource index of the one or more SRSs. May be used to transmit the PUCCH.
  • the RS indicated by the spatial relationship information of the PUCCH may be the RS of the serving cell instructed by the information of the serving cell ID when the information of the serving cell ID (“servingCellId”) is included in the spatial relationship information of the PUCCH. Otherwise, it may be the RS of the serving cell in which the spatial relationship information of the PUCCH is set.
  • the RS (particularly SRS) indicated by the spatial relation information of the PUCCH is designated by the information of the UL BWP when the spatial relation information of the PUCCH includes the information of UL BWP (BWP ID of “uplink BWP”).
  • UL BWP RS, or otherwise active UL BWP RS is designated by the information of the UL BWP when the spatial relation information of the PUCCH includes the information of UL BWP (BWP ID of “uplink BWP”).
  • the UE can suitably transmit the PUCCH in response to the combined beam across multiple RSs.
  • the PUCCH may be transmitted using a combined beam.
  • the sixth embodiment relates to UE capabilities.
  • the UE may send predetermined capability information (UE capability information) to the base station.
  • UE capability information UE capability information
  • the various embodiments described above may be assumed to be utilized when the UE reports the predetermined capability information.
  • the predetermined capability information may be capability information indicating that the combined beam can be received or transmitted.
  • the predetermined capability information is capability information regarding the maximum number of RSs having at least one of different QCLs (or QCL types), different TCI states and different spatial relationships (or SRIs) that can be combined (to generate a wide beam). May be
  • the processing time for at least one of PDCCH, PDSCH, PUCCH and PUSCH may take different values based on the predetermined capability information (for example, the maximum number of RSs that can be combined).
  • the base station may transmit information for activating the combined beam to the UE that has reported the above-mentioned predetermined capability information, using upper layer signaling, physical layer signaling, or a combination thereof.
  • a UE that has received the information for enabling the combined beam may operate according to at least one of the above-described various embodiments, and a UE that does not receive the information for enabling the combined beam may be as described above. It may be assumed that it cannot operate according to various embodiments.
  • UEs that do not transmit the above-mentioned predetermined capability information may not be expected to operate according to the above-described various embodiments.
  • any one of the various embodiments may be used, or a plurality (for example, all) may be used.
  • any one of the embodiments 4-1 to 4-5 may be used, or a plurality thereof may be used (a suitable embodiment may be adopted for each different PUSCH).
  • various embodiments may be assumed to be used when the UE has the URLLC set by higher layer signaling (set to operate for URLLC), or does not have the URLLC set. It may be used in some cases.
  • wireless communication system Wireless communication system
  • communication is performed using any of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.
  • FIG. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
  • the wireless communication system 1 may be a system that realizes communication by using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..
  • the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs).
  • MR-DC has dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) with LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and dual connectivity (NR-E) with NR and LTE.
  • E-UTRA-NR Dual Connectivity EN-DC
  • NR-E Dual Connectivity
  • NE-DC Dual Connectivity
  • the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (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 a plurality of 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)
  • N-DC dual connectivity
  • MN and SN are NR base stations (gNB).
  • the wireless communication system 1 includes a base station 11 forming a macro cell C1 having a relatively wide coverage and a base station 12 (12a-12c) arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. You may prepare.
  • the user terminal 20 may be located in at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to those shown in the figure.
  • the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.
  • the user terminal 20 may be connected to at least one of the plurality of base stations 10.
  • the user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) using multiple component carriers (Component Carrier (CC)) and dual connectivity (DC).
  • CA Carrier Aggregation
  • CC Component Carrier
  • 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)).
  • the macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2.
  • FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz).
  • the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
  • the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • the plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
  • wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
  • NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is the Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is the IAB. It may be called a node.
  • IAB Integrated Access Backhaul
  • relay station relay station
  • the base station 10 may be connected to the core network 30 via another base station 10 or directly.
  • the core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
  • EPC Evolved Packet Core
  • 5GCN 5G Core Network
  • NGC Next Generation Core
  • the user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.
  • an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) based wireless access method may be used.
  • OFDM Orthogonal Frequency Division Multiplexing
  • DL Downlink
  • UL Uplink
  • DFT-s-OFDM Discrete Fourier Transform Spread OFDM
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the wireless access method may be called a waveform.
  • other wireless access methods such as another single carrier transmission method and another multicarrier transmission method may be used as the UL and DL wireless access methods.
  • downlink shared channels Physical Downlink Shared Channel (PDSCH)
  • broadcast channels Physical Broadcast Channel (PBCH)
  • downlink control channels Physical Downlink Control
  • an uplink shared channel Physical Uplink Shared Channel (PUSCH)
  • an uplink control channel Physical Uplink Control Channel (PUCCH)
  • a random access channel that are shared by each user terminal 20.
  • Physical Random Access Channel (PRACH) Physical Random Access Channel
  • User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
  • User data, upper layer control information, and the like may be transmitted by the PUSCH.
  • the Master Information Block (MIB) may be transmitted by the PBCH.
  • Lower layer control information may be transmitted by the PDCCH.
  • the lower layer control information may include downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH, for example.
  • DCI Downlink Control Information
  • DCI for scheduling PDSCH may be referred to as DL assignment, DL DCI, etc.
  • DCI for scheduling PUSCH may be referred to as UL grant, UL DCI, etc.
  • PDSCH may be replaced with DL data
  • PUSCH may be replaced with UL data.
  • a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used to detect the PDCCH.
  • CORESET corresponds to a resource for searching DCI.
  • the search space corresponds to the search area and the search method of the PDCCH candidates.
  • a CORESET may be associated with one or more search spaces. The UE may monitor CORESET associated with a search space based on the search space settings.
  • One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
  • One or more search spaces may be referred to as a search space set.
  • the “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting” and the like of the present disclosure may be read as each other.
  • channel state information (Channel State Information (CSI)
  • delivery confirmation information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
  • scheduling request (Scheduling Request (Scheduling Request ( Uplink Control Information (UCI) including at least one of (SR))
  • CSI Channel State Information
  • HARQ-ACK Hybrid Automatic Repeat reQuest ACKnowledgement
  • ACK/NACK ACK/NACK
  • scheduling request Scheduling Request (Scheduling Request ( Uplink Control Information (UCI) including at least one of (SR)
  • a random access preamble for establishing a connection with a cell may be transmitted by the PRACH.
  • downlink, uplink, etc. may be expressed without adding “link”. Further, it may be expressed without adding “Physical” to the head of each channel.
  • a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted.
  • a DL-RS a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation) 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 (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
  • a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as an SS/PBCH block, SS Block (SSB), or the like. Note that SS and SSB may also be referred to as reference signals.
  • the wireless communication system even if the measurement reference signal (Sounding Reference Signal (SRS)), the demodulation reference signal (DMRS), etc. are transmitted as the uplink reference signal (Uplink Reference Signal (UL-RS)). Good.
  • the DMRS may be called a user terminal specific reference signal (UE-specific Reference Signal).
  • FIG. 7 is a diagram illustrating an example of the configuration of the base station according to the embodiment.
  • the base station 10 includes a control unit 110, a transmission/reception unit 120, a transmission/reception antenna 130, and a transmission line interface 140. It should be noted that the control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140 may each be provided with one or more.
  • the functional blocks of the characteristic part in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
  • the control unit 110 controls the entire base station 10.
  • the control unit 110 can be configured by a controller, a control circuit, and the like described based on common recognition in the technical field of the present disclosure.
  • the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
  • the control unit 110 may control transmission/reception using the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140, measurement, and the like.
  • the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer the generated data to the transmission/reception unit 120.
  • the control unit 110 may perform communication channel call processing (setting, release, etc.), state management of the base station 10, wireless resource management, and the like.
  • the transmission/reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123.
  • the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
  • the transmission/reception unit 120 includes a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission/reception 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 by a transmission unit and a reception unit.
  • the transmitting unit may include a transmission processing unit 1211 and an RF unit 122.
  • the receiving unit may include a reception processing unit 1212, an RF unit 122, and a measuring unit 123.
  • the transmission/reception antenna 130 can be configured by an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna or the like.
  • the transmitting/receiving unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
  • the transmitter/receiver 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
  • the transmission/reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.
  • digital beamforming for example, precoding
  • analog beamforming for example, phase rotation
  • the transmission/reception unit 120 processes the Packet Data Convergence Protocol (PDCP) layer and the Radio Link Control (RLC) layer (for example, for data and control information acquired from the control unit 110) (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
  • the transmission/reception unit 120 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) on the bit string to be transmitted. Processing (as necessary), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-analog conversion, and other transmission processing may be performed to output the baseband signal.
  • channel coding may include error correction coding
  • modulation modulation
  • mapping mapping
  • filtering discrete Fourier transform
  • DFT discrete Fourier Transform
  • IFFT inverse fast Fourier transform
  • precoding coding
  • digital-analog conversion digital-analog conversion
  • the transmitter/receiver 120 may perform modulation, filtering, amplification, etc. on the baseband signal in a radio frequency band, and transmit the radio frequency band signal via the transmission/reception antenna 130. ..
  • the transmission/reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc., on the signal in the radio frequency band received by the transmission/reception antenna 130.
  • the transmission/reception unit 120 performs analog-digital conversion, fast Fourier transform (Fast Fourier Transform (FFT)) processing, and inverse discrete Fourier transform (Inverse Discrete Fourier Transform (IDFT) on the acquired baseband signal. ))
  • FFT Fast Fourier transform
  • IDFT inverse discrete Fourier transform
  • Apply reception processing such as processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, User data and the like may be acquired.
  • the transmission/reception unit 120 may perform measurement on the received signal.
  • the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
  • the measurement unit 123 receives 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
  • the measurement result may be output to the control unit 110.
  • the transmission path interface 140 transmits/receives signals (backhaul signaling) to/from devices included in the core network 30, other base stations 10, and the like, and user data (user plane data) for the user terminal 20 and a control plane. Data or the like may be acquired or transmitted.
  • the transmission unit and the reception unit of the base station 10 may be configured by at least one of the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140.
  • the transmission/reception unit 120 may transmit a reference signal (for example, SSB, CSI-RS, etc.).
  • a reference signal for example, SSB, CSI-RS, etc.
  • the control unit 110 may recognize that the user terminal 20 has selected a plurality of reference signals (for example, SSB sets) based on one or a plurality of PRACHs transmitted from the user terminal 20.
  • the control unit 110 may transmit the channel/signal using the combined beam to the user terminal 20 that has selected the plurality of reference signals.
  • FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
  • the user terminal 20 includes a control unit 210, a transmission/reception unit 220, and a transmission/reception antenna 230. Note that each of the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with one or more.
  • the functional blocks of the characteristic part in the present embodiment are mainly shown, and the user terminal 20 may be assumed to also have 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 entire user terminal 20.
  • the control unit 210 can be configured by a controller, a control circuit, and the like that are described 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, and the like using the transmission/reception unit 220 and the transmission/reception antenna 230.
  • the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer the data to the transmission/reception unit 220.
  • the transmitter/receiver 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
  • the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
  • the transmitter/receiver 220 may include a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter/receiver circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.
  • the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit.
  • the transmission unit may include a transmission processing unit 2211 and an RF unit 222.
  • the reception unit may include a reception processing unit 2212, an RF unit 222, and a measurement unit 223.
  • the transmission/reception antenna 230 can be configured by an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna or the like.
  • the transmitter/receiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
  • the transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
  • the transmission/reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.
  • digital beamforming for example, precoding
  • analog beamforming for example, phase rotation
  • the transmission/reception unit 220 processes the PDCP layer, the RLC layer (for example, RLC retransmission control), and the MAC layer (for example, for the data and control information acquired from the control unit 210). , HARQ retransmission control) or the like to generate a bit string to be transmitted.
  • the transmission/reception unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), and IFFT processing on the bit string to be transmitted.
  • the baseband signal may be output by performing transmission processing such as precoding and digital-analog conversion.
  • the transmission/reception unit 220 (transmission processing unit 2211) is configured to transmit the channel using a DFT-s-OFDM waveform when transform precoding is enabled for the channel (for example, PUSCH).
  • the DFT process may be performed as the transmission process, or otherwise, the DFT process may not be performed as the transmission process.
  • the transmitter/receiver 220 may perform modulation, filtering, amplification, etc. on the baseband signal in the radio frequency band, and transmit the radio frequency band signal via the transmission/reception antenna 230. ..
  • the transmission/reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, etc., on a signal in the radio frequency band received by the transmission/reception antenna 230.
  • the transmission/reception unit 220 (reception processing unit 2212) performs analog-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (error correction) on the acquired baseband signal.
  • User data and the like may be acquired by applying reception processing such as MAC layer processing, RLC layer processing, and PDCP layer processing.
  • the transmission/reception unit 220 may perform measurement on the received signal.
  • the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
  • the measurement unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), channel information (for example, CSI), and the like.
  • the measurement result may be output to the control unit 210.
  • the transmission unit and the reception unit of the user terminal 20 may be configured by at least one of the transmission/reception unit 220 and the transmission/reception antenna 230.
  • the transmitter/receiver 220 may receive a reference signal (for example, SSB, CSI-RS, etc.).
  • a reference signal for example, SSB, CSI-RS, etc.
  • the control unit 210 may perform control to select a plurality of the reference signals and transmit a random access preamble (PRACH) corresponding to the selected plurality of reference signals.
  • PRACH random access preamble
  • the random access preamble may be one or plural.
  • multiple reference signals may be referred to as a set of reference signals (a set of RSs).
  • the control unit 210 controls to transmit one random access preamble corresponding to the selected reference signals using one physical random access channel resource (PRACH resource) associated with the selected reference signals. You can go.
  • PRACH resource physical random access channel resource
  • the control unit 210 transmits one random access preamble corresponding to a first reference signal of the selected plurality of reference signals using a physical random access channel resource associated with the first reference signal, and You may perform control which transmits one random access preamble corresponding to a 2nd reference signal among the selected several reference signals using the physical random access channel resource linked
  • the control unit 210 determines transmission power for one or a plurality of random access preambles corresponding to the selected plurality of reference signals based on a path loss value estimated by each of the selected plurality of reference signals. May be.
  • the controller 210 determines that the random access response to the one or more random access preambles corresponding to the selected reference signals has the same Quasi-Co-Location (QCL) characteristic as the selected reference signals. You may assume.
  • QCL Quasi-Co-Location
  • control unit 210 may determine the QCL characteristic of the DMRS for the PDCCH based on the active TCI state corresponding to (a set of) a plurality of reference signals for a predetermined CORESET.
  • the transmitter/receiver 220 may receive (detect) the PDCCH (and thus the DCI) based on the QCL characteristic.
  • the plurality of reference signals may correspond to at least one of more than one reference signal for QCL type A and more than one reference signal for QCL type D included in one TCI state.
  • the control unit 210 may assume that the DMRS has the same QCL characteristics as all reference signals in one active TCI state.
  • QCL types such as the QCL types A and D in the present disclosure may be read as arbitrary QCL types.
  • One TCI state may include up to one QCL type A reference signal and up to one QCL type D reference signal.
  • the control unit 210 may assume that the DMRS has the same QCL characteristics as all reference signals in a plurality of active TCI states.
  • the control unit 210 sets the upper layer parameter (“tci-PresentInDCI”) indicating that the TCI field is present in the downlink control information (eg, DCI format 1_1) for scheduling PDSCH to “enabled”, and
  • the TCI field may indicate a plurality of TCI states.
  • control unit 210 may perform one or a plurality of estimations using (a set of) reference signals associated with a predetermined uplink channel (eg, PRACH, PUCCH) or an uplink reference signal (eg, SRS).
  • the transmission power of PUSCH may be determined based on the path loss value.
  • the transceiver unit 220 may transmit the PUSCH using the transmission power.
  • the control unit 210 may perform control to apply the same spatial relationship to the PUSCH as that applied to PRACH transmission.
  • the control unit 210 is applied to the initial transmission of the PUSCH when the PUSCH is a retransmission of the PUSCH (RAR UL grant PUSCH) based on the uplink grant of the random access response, which is scheduled by the DCI format 0_0.
  • RAR UL grant PUSCH a retransmission of the PUSCH
  • the same spatial relationship as the above may be applied to the PUSCH.
  • the control unit 210 determines that the PUSCH is a PUSCH scheduled by the DCI format 0_1 including the SRS resource indicator (“SRS resource indicator” field) or the SRS resource indicator (upper layer parameter “srs-ResourceIndicator”) is set.
  • the precoder for the PUSCH is set to one SRS resource set in which a plurality of reference signals corresponding to the SRS resource indicator is set, or It may be determined to be associated with multiple SRS resources corresponding to the SRS resource indicator.
  • the control unit 210 uses the index of the plurality of reference signals.
  • the PUCCH may be transmitted using the same spatial domain filter applied to receive or transmit the corresponding reference signal.
  • each functional block may be realized by using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated). , Wired, wireless, etc.) and may be implemented using these multiple devices.
  • the functional blocks may be realized by combining the one device or the plurality of devices with software.
  • the functions include judgment, determination, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting (notifying), notifying (communicating), forwarding (forwarding), configuring (reconfiguring), allocating (allocating, mapping), allocating (assigning), etc.
  • a functional block (configuration unit) that causes transmission to function may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
  • the implementation method is not particularly limited.
  • the base station, the user terminal, and the like may function as a computer that performs the process of the wireless communication method of the present disclosure.
  • FIG. 9 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment.
  • the base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..
  • the terms such as a device, a circuit, a device, a section, and a unit are interchangeable with each other.
  • the hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
  • processor 1001 may be implemented by one or more chips.
  • the processor 1001 For each function in the base station 10 and the user terminal 20, for example, by causing a predetermined software (program) to be loaded on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs calculation and communication via the communication device 1004. Is controlled, and at least one of reading and writing of data in the memory 1002 and the storage 1003 is controlled.
  • a predetermined software program
  • the processor 1001 operates an operating system to control the entire computer, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • the control unit 110 (210) and the transmission/reception unit 120 (220) described above may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), software module, data, and the like from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
  • a program program code
  • the control unit 110 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized similarly for other functional blocks.
  • the memory 1002 is a computer-readable recording medium, and for example, at least Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other appropriate storage media. It may be configured by one.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 may store an executable program (program code), a software module, etc. for implementing the 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® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, and/or any other suitable storage medium May be configured by.
  • the storage 1003 may be called an auxiliary storage device.
  • the communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
  • the communication device 1004 for example, realizes at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. May be included.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the transmission/reception unit 120 (220) and the transmission/reception antenna 130 (230) described above may be realized by the communication device 1004.
  • the transmitter/receiver 120 (220) may be physically or logically separated from the transmitter 120a (220a) and the receiver 120b (220b).
  • the input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside.
  • the input device 1005 and the output device 1006 may 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 by using a single bus, or may be configured by using a different bus for each device.
  • the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and part or all of each functional block may be realized by using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware.
  • DSP digital signal processor
  • ASIC Application Specific Integrated Circuit
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • channel, symbol and signal may be read as each other.
  • the signal may also be a message.
  • the reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard.
  • a component carrier Component Carrier (CC)
  • CC Component Carrier
  • a radio frame may be composed of one or more periods (frames) in the time domain.
  • Each of the one or more periods (frames) forming the radio frame may be referred to as a subframe.
  • a subframe may be composed of one or more slots in the time domain.
  • the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
  • the numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and radio frame configuration. , At least one of a specific filtering process performed by the transceiver in the frequency domain and a specific windowing process performed by the transceiver in the time domain.
  • a slot may be composed of one or more symbols in the time domain (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.).
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the slot may be a time unit based on numerology.
  • a slot may include multiple minislots. Each minislot may be composed of one or more symbols in the time domain. The minislot may also be called a subslot. Minislots may be configured with a smaller number of symbols than slots.
  • a PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be referred to as PDSCH (PUSCH) mapping type A.
  • the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
  • Radio frame, subframe, slot, minislot, and symbol all represent the time unit for signal transmission. Radio frames, subframes, slots, minislots, and symbols may have different names corresponding to them. It should be noted that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be interchanged with each other.
  • 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 the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. May be
  • the unit representing the TTI may be called a slot, a minislot, etc. instead of a subframe.
  • TTI means, for example, a minimum time unit of scheduling in wireless communication.
  • the base station performs scheduling to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) to each user terminal in units of TTI.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, a codeword, or a processing unit such as scheduling or link adaptation.
  • transport block channel-encoded data packet
  • code block code block
  • codeword codeword
  • processing unit such as scheduling or link adaptation.
  • one slot or one minislot is called a TTI
  • one or more TTIs may be the minimum time unit for scheduling.
  • the number of slots (minislot number) that constitutes 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), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
  • a TTI shorter than the normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
  • a long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortening TTI, etc.) is less than the TTI length of the long TTI and is 1 ms. It may be read as a TTI having the above TTI length.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
  • the number of subcarriers included in the RB may be the same regardless of the numerology, and may be 12, for example.
  • the number of subcarriers included in the RB may be determined based on numerology.
  • the RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length.
  • One TTI, one subframe, etc. may be configured by one or a plurality of resource blocks.
  • One or more RBs are a physical resource block (Physical RB (PRB)), a subcarrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.
  • a resource block may be composed of one or more resource elements (Resource Element (RE)).
  • RE resource elements
  • one RE may be a radio resource area of one subcarrier and one symbol.
  • Bandwidth Part (may be called partial bandwidth etc.) represents a subset of continuous common RBs (common resource blocks) for a certain neurology in a certain carrier. Good.
  • the common RB may be specified by the index of the RB 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 UL BWP
  • BWP for DL DL BWP
  • One or more BWPs may be configured in one carrier for the UE.
  • At least one of the configured BWPs may be active, and the UE does not have to expect to send and receive a given signal/channel outside the active BWP.
  • “cell”, “carrier”, and the like in the present disclosure may be read as “BWP”.
  • the structure of the radio frame, subframe, slot, minislot, symbol, etc. described above is merely an example.
  • the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, and included in RBs The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.
  • the information, parameters, etc. described in the present disclosure may be represented by using an absolute value, may be represented by using a relative value from a predetermined value, or by using other corresponding information. May be represented.
  • the radio resource may be indicated by a predetermined index.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description include voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any of these. May be represented by a combination of
  • Information and signals may be output from the upper layer to at least one of the lower layer and the lower layer to the upper layer.
  • Information, signals, etc. may be input and output via a plurality of network nodes.
  • Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Information, signals, etc. that are input and output can be overwritten, updated or added. The output information, signal, etc. may be deleted. The input information, signal, etc. may be transmitted to another device.
  • notification of information is not limited to the aspect/embodiment described in the present disclosure, and may be performed using another method.
  • notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), upper layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (master information block (Master Information Block (MIB)), system information block (System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof May be implemented by.
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC Radio Resource Control
  • MIB Master Information Block
  • SIB System Information Block
  • MAC Medium Access Control
  • the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
  • the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.
  • the MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
  • CE MAC Control Element
  • the notification of the predetermined information is not limited to the explicit notification, and may be implicitly (for example, by not issuing the notification of the predetermined information or another information). May be carried out).
  • the determination may be performed by a value represented by 1 bit (0 or 1), or may be performed by a boolean value represented by true or false. , May be performed by comparison of numerical values (for example, comparison with a predetermined value).
  • software, instructions, information, etc. may be sent and received via a transmission medium.
  • the software uses at least one of wired technology (coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) , Servers, or other remote sources, these wired and/or wireless technologies are included within the definition of transmission media.
  • Network may mean a device (eg, a base station) included in the network.
  • precoding "precoding weight”
  • QCL Quality of Co-Location
  • TCI state "Transmission Configuration Indication state”
  • space "Spatial 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”, and “panel” are interchangeable.
  • base station BS
  • wireless base station fixed station
  • NodeB NodeB
  • eNB eNodeB
  • gNB gNodeB
  • Access point "Transmission Point (TP)", “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
  • Cell Cell
  • femto cell femto cell
  • pico cell femto cell
  • a base station can accommodate one or more (eg, three) cells.
  • a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being defined by a base station subsystem (for example, a small indoor base station (Remote Radio Head (RRH))) to provide communication services.
  • a base station subsystem for example, a small indoor base station (Remote Radio Head (RRH))
  • RRH Remote Radio Head
  • the term "cell” or “sector” refers to part or all of the coverage area of at least one of a base station and a base station subsystem providing communication services in this coverage.
  • MS Mobile Station
  • UE User Equipment
  • a mobile station is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal. , Handset, user agent, mobile client, client or some other suitable term.
  • At least one of the base station and the mobile station may be called a transmission device, a reception device, a wireless communication device, or the like.
  • the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like.
  • the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned).
  • At least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation.
  • at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be replaced by the user terminal.
  • the communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (eg, may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
  • D2D Device-to-Device
  • V2X Vehicle-to-Everything
  • each aspect/embodiment of the present disclosure may be applied.
  • the user terminal 20 may have the function of the base station 10 described above.
  • the words such as “up” and “down” may be replaced with the words corresponding to the communication between terminals (for example, “side”).
  • the uplink channel and the downlink channel may be replaced with the side channel.
  • the user terminal in the present disclosure may be replaced by the base station.
  • the base station 10 may have the function of the user terminal 20 described above.
  • the operation supposed 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 include a base station and one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. are conceivable, but not limited to these) or a combination of these is clear.
  • 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 switched according to execution. Further, the order of the processing procedure, sequence, flowchart, etc. of each aspect/embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps in 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
  • Future Radio Access FAA
  • New-Radio Access Technology RAT
  • NR New Radio
  • NX New radio access
  • FX Future generation radio access
  • GSM Global System for Mobile communications
  • CDMA2000 CDMA2000
  • Ultra Mobile Broadband UMB
  • IEEE 802.11 Wi-Fi (registered trademark)
  • IEEE 802.11 WiMAX (registered trademark)
  • IEEE 802.11 WiMAX (registered trademark)
  • IEEE 802.11 WiMAX (registered trademark)
  • Ultra-WideBand (UWB), Bluetooth (registered trademark), a system using another appropriate wireless communication method, a next-generation system extended based on these, and the like may be applied.
  • a plurality of systems may be combined and applied (for example, a combination of LTE or LTE-A and 5G).
  • the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both "based only on” and “based at least on.”
  • references to elements using the designations “first,” “second,” etc. as used in this disclosure does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, references to first and second elements do not mean that only two elements may be employed or that the first element must precede the second element in any way.
  • determining may encompass a wide variety of actions.
  • judgment means “judging", “calculating”, “computing”, “processing”, “deriving”, “investigating”, “searching” (looking up, search, inquiry) ( For example, it may be considered to be a “decision” for a search in a table, database or another data structure), ascertaining, etc.
  • “decision (decision)” means receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), access ( Accessing) (eg, accessing data in memory) and the like may be considered to be a “decision.”
  • judgment (decision) is regarded as “decision (decision)” of resolving, selecting, choosing, choosing, establishing, establishing, comparing, etc. Good. That is, “determination (decision)” may be regarded as “determination (decision)” of some operation.
  • connection refers to any direct or indirect connection or coupling between two or more elements. And may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
  • the connections or connections between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”.
  • radio frequency domain microwave Regions
  • electromagnetic energy having wavelengths in the light (both visible and invisible) region, etc. can be used to be considered “connected” or “coupled” to each other.
  • the term “A and B are different” may mean “A and B are different from each other”.
  • the term may mean that “A and B are different from C”.
  • the terms “remove”, “coupled” and the like may be construed as “different” as well.
PCT/JP2019/000392 2019-01-09 2019-01-09 ユーザ端末及び無線通信方法 WO2020144775A1 (ja)

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