WO2022085179A1 - 端末、無線通信方法及び基地局 - Google Patents
端末、無線通信方法及び基地局 Download PDFInfo
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- H—ELECTRICITY
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
- H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
- H04B7/06968—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping using quasi-colocation [QCL] between signals
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- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
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- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
Definitions
- This disclosure relates to terminals, wireless communication methods and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- 3GPP Rel.10-14 LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- a successor system to LTE for example, 5th generation mobile communication system (5G), 5G + (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 or later, etc.
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- transmission points eg, Remote RadioHead (RRH)
- RRH Remote RadioHead
- one of the purposes of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately receive downlink signals from a plurality of transmission points.
- a terminal includes a receiving unit that receives a first upper layer parameter indicating a resource of a first tracking reference signal (TRS) and a second upper layer parameter indicating a resource of a second TRS, and the above-mentioned terminal. Based on the first TRS and the second TRS, the control unit controls at least one reception of the physical downlink control channel and the physical downlink shared channel, and the pseudo-collocation relationship between the first TRS and the second TRS is , Does not include Doppler shift.
- TRS tracking reference signal
- downlink signals from a plurality of transmission points can be appropriately received.
- FIG. 1A and 1B are diagrams showing an example of communication between a mobile body and a transmission point (for example, RRH).
- 2A to 2C are diagrams showing an example of schemes 0 to 2 relating to SFN.
- 3A and 3B are diagrams showing an example of the first embodiment.
- 4A and 4B are diagrams showing an example of the second embodiment.
- FIG. 5 is a diagram showing an example of Aspect 3-2. 6A and 6B are views showing an example of aspect 3-3.
- FIG. 7 is a diagram showing an example of the TCI state according to the fourth embodiment.
- 8A and 8B are diagrams showing an example of the default TCI state according to the fourth embodiment.
- FIG. 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 10 is a diagram showing an example of the configuration of a base station according to an embodiment.
- FIG. 11 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- FIG. 12 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- reception processing for example, reception, demapping, demodulation, etc.
- transmission processing e.g., at least one of transmission, mapping, precoding, modulation, and coding
- the TCI state may represent what applies to the downlink signal / channel.
- the equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.
- the TCI state is information related to signal / channel pseudo collocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameters, spatial relation information, or the like.
- QCL Quality of Service
- the TCI state may be set in the UE per channel or per signal.
- QCL is an index showing the statistical properties of signals / channels. For example, when one signal / channel and another signal / channel have a QCL relationship, Doppler shift, Doppler spread, and average delay are performed between these different signals / channels. ), Delay spread, and spatial parameter (for example, spatial Rx parameter) can be assumed to be the same (QCL for at least one of these). You may.
- the spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL.
- the QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).
- QCL types A plurality of types (QCL types) may be specified for the QCL.
- QCL types AD QCL types with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (may be referred to as QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread, -QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and average delay, -QCL type D (QCL-D): Spatial reception parameter.
- QCL-A Doppler shift, Doppler spread, average delay and delay spread
- -QCL type B QCL type B
- QCL type C QCL type C
- QCL-D Spatial reception parameter.
- the UE assumes that one control resource set (Control Resource Set (CORESET)) has a specific QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. It may be called a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the UE may determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI state of the signal / channel or the QCL assumption.
- the TCI state may be, for example, information about the QCL of the target channel (in other words, the reference signal for the channel (Reference Signal (RS))) and another signal (for example, another RS). ..
- the TCI state may be set (instructed) by higher layer signaling, physical layer signaling, or a combination thereof.
- the physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- the channels for which the TCI state or spatial relationship is set are, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and an uplink shared channel (Physical Uplink Shared). It may be at least one of a Channel (PUSCH)) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCH Downlink Control Channel
- PUSCH Physical Uplink Control Channel
- PUCCH Physical Uplink Control Channel
- the RS having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a measurement reference signal (Sounding). It may be at least one of Reference Signal (SRS)), CSI-RS for tracking (also referred to as Tracking Reference Signal (TRS)), and reference signal for QCL detection (also referred to as QRS).
- SSB Synchronization Signal Block
- CSI-RS Channel State Information Reference Signal
- Sounding Sounding
- SRS Reference Signal
- TRS Tracking Reference Signal
- QRS reference signal for QCL detection
- the SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- the SSB may be referred to as an SS / PBCH block.
- the RS of the QCL type X in the TCI state may mean an RS having a relationship between a certain channel / signal (DMRS) and the QCL type X, and this RS is called the QCL source of the QCL type X in the TCI state. You may.
- DMRS channel / signal
- the QCL type A RS may always be set for the PDCCH and PDSCH, and the QCL type D RS may be additionally set. Since it is difficult to estimate Doppler shift, delay, etc. by receiving one shot of DMRS, QCL type A RS is used to improve the channel estimation accuracy.
- the QCL type D RS is used to determine the received beam when receiving a DMRS.
- TRS1-1, 1-2, 1-3, 1-4 are transmitted, and TRS1-1 is notified as QCL type C / D RS according to the TCI status of PDSCH.
- the UE can use the information obtained from the result of the past periodic reception / measurement of TRS1-1 for the reception / channel estimation of the DMRS for PDSCH.
- the QCL source of the PDSCH is TRS1-1
- the QCL target is the DMRS for PDSCH.
- DL DCI (PDSCH) is set both when the TCI information in DCI (upper layer parameter TCI-PresentInDCI) is set to "enabled” and when the TCI information in DCI is not set.
- TCI-PresentInDCI TCI information in DCI
- Non-cross-carrier scheduling if the time offset between the receipt of the scheduled DCI) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than the threshold (timeDurationForQCL) (applicable condition, first condition).
- the TCI state (default TCI state) of the PDSCH may be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of the CC (of the specific UL signal). Otherwise, the PDSCH TCI state (default TCI state) may be the TCI state of the PDSCH's lowest TCI state ID in the active DL BWP of the scheduled CC.
- an individual MAC CE of a MAC CE for activation / deactivation related to PUCCH space and a MAC CE for activation / deactivation related to SRS space is required.
- the PUSCH spatial relationship follows the SRS spatial relationship.
- At least one of the MAC CE for activation / deactivation related to PUCCH space and the MAC CE for activation / deactivation related to SRS space may not be used.
- both the spatial relationship for PUCCH and PL-RS are not set in FR2 (applicable condition, second condition), the spatial relationship for PUCCH and the default assumption of PL-RS (default spatial relationship and default PL-RS). Is applied. If, in FR2, both the spatial relationship for SRS (SRS resource for SRS or SRS resource corresponding to SRI in DCI format 0_1 for scheduling PUSCH) and PL-RS are not set (applicable condition, second condition). Spatial relations and PL-RS default assumptions (default spatial relations and default PL-RS) are applied to PUSCH and SRS scheduled by DCI format 0_1.
- the default spatial relationship and default PL-RS are based on the TCI state or QCL assumption of the CORESET having the lowest CORESET ID in the active DL BWP. There may be. If CORESET is not set in the active DL BWP on the CC, the default spatial relationship and the default PL-RS may be the active TCI state with the lowest ID of the PDSCH in the active DL BWP.
- the spatial relationship of the PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource having the lowest PUCCH resource ID among the active spatial relationships of the PUCCH on the same CC.
- the network needs to update the PUCCH spatial relationships on all SCells, even if the PUCCHs are not transmitted on the SCells.
- the application condition of the default spatial relationship for SRS / default PL-RS may include that the default beam path loss enablement information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) is effectively set.
- the application condition of the default spatial relationship / default PL-RS for PUCCH may include that the default beam path loss enablement information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) is effectively set.
- the default spatial relationship / default PL-RS application condition for PUSCH scheduled by DCI format 0_0 is that the default beam path loss enablement information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) is effectively set. May include that.
- the above thresholds are the time duration for QCL, "timeDurationForQCL”, “Threshold”, “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", “Threshold-Sched-Offset”, and schedule. It may be called an offset threshold value, a scheduling offset threshold value, or the like.
- the offset between the DL DCI reception and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one TCI state set for the scheduled PDSCH serving cell comprises a "QCL type D" and If the UE is set with two default TCI enable parameters (enableTwoDefaultTCIStates-r16) and at least one TCI code point indicates two TCI states, the UE will have two DMRS ports for the serving cell PDSCH or PDSCH transmission occasion. Assume that RS and QCL (quasi co-located) with respect to the QCL parameters associated with the two TCI states corresponding to the lowest code point of the TCI code points containing different TCI states. 2 The default TCI enablement parameter is Rel. Of the two default TCI states for PDSCH when at least one TCI code point is mapped to the two TCI states. 16 Indicates that the operation is enabled.
- Multi TRP In the NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP (multi TRP (MTRP))) are used for the UE using one or more panels (multi-panel). It is being considered to perform DL transmission. It is also being considered that the UE performs UL transmission to one or more TRPs using one or more panels.
- TRP Transmission / Reception Point
- MTRP multi TRP
- the plurality of TRPs may correspond to the same cell identifier (cell Identifier (ID)) or may correspond to different cell IDs.
- the cell ID may be a physical cell ID or a virtual cell ID.
- the multi-TRP (for example, TRP # 1 and # 2) may be connected by an ideal / non-ideal backhaul, and information, data, etc. may be exchanged.
- Different code words Code Word (CW)
- CW Code Word
- Different layers may be transmitted from each TRP of the multi-TRP.
- NJT non-coherent joint transmission
- TRP # 1 modulation-maps the first codeword, layer-maps it, and transmits the first PDSCH to the first number of layers (eg, the second layer) using the first precoding.
- TRP # 2 modulates and maps the second codeword, layer-maps the second number of layers (for example, two layers), and transmits the second PDSCH using the second precoding.
- the plurality of PDSCHs (multi-PDSCHs) to be NCJT may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap at least one of the time and frequency resources.
- first PDSCH and second PDSCH may be assumed to be not quasi-co-located in a pseudo-collocation (Quasi-Co-Location (QCL)) relationship.
- the reception of the multi-PDSCH may be read as the simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI, single PDCCH) (based on single master mode, single DCI).
- Multi TRP single-DCI based multi-TRP.
- Multiple PDSCHs from the multi-TRP may be scheduled using multiple DCIs (multi-DCI, multi-PDCCH (multiple PDCCH)), respectively (multi-master mode, multi-DCI based multi-). TRP)).
- PDSCH transport block (TB) or codeword (CW) repetition (repetition) across multi-TRP.
- URLLC schemes URLLC schemes, eg, schemes 1, 2a, 2b, 3, 4
- SDM space division multiplexing
- FDM frequency division multiplexing
- RV redundant version
- the RV may be the same or different for the multi-TRP.
- the multi-PDSCH from the multi-TRP is time division multiplexing (TDM).
- TDM time division multiplexing
- the multi-PDSCH from the multi-TRP is transmitted in one slot.
- the multi-PDSCH from the multi-TRP is transmitted in different slots.
- one control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) may correspond to one TRP.
- HST HST
- the large antenna transmits outside / inside the tunnel.
- the transmission power of the large antenna is about 1 to 5 W.
- the transmission power of the small antenna is about 250 mW.
- a plurality of small antennas (transmission / reception points) having the same cell ID and a distance of 300 m form a single frequency network (SFN). All small antennas in the SFN transmit the same signal at the same time on the same PRB. It is assumed that the terminal sends and receives to one base station. In reality, multiple transmission / reception points transmit the same DL signal. When moving at high speed, transmission / reception points in units of several kilometers form one cell. Handover is performed when straddling cells. This makes it possible to reduce the frequency of handover.
- NR In NR, it is transmitted from a transmission point (for example, RRH) in order to communicate with a terminal (hereinafter, also referred to as UE) included in a moving body (HST (high speed train)) such as a train moving at high speed. It is assumed that a beam will be used.
- HST high speed train
- Existing systems eg, Rel.15 support transmitting a unidirectional beam from the RRH to communicate with the mobile (see FIG. 1A).
- FIG. 1A shows a case where RRHs are installed along a moving path (or a moving direction, a traveling direction, a traveling path) of a moving body, and a beam is formed from each RRH on the traveling direction side of the moving body.
- the RRH forming a unidirectional beam may be referred to as a uni-directional RRH (uni-directional RRH).
- the moving body receives a negative Doppler shift ( -fD ) from each RRH.
- the beam may be formed on the side opposite to the traveling direction, and the beam may be formed on the traveling direction of the moving body. Beams may be formed in any direction regardless of.
- a plurality of (for example, two or more) beams are transmitted from the RRH.
- a beam is formed in both the traveling direction of the moving body and the direction opposite to the traveling direction (see FIG. 1B).
- FIG. 1B shows a case where RRHs are installed along the movement path of the moving body and beams are formed from each RRH on both the traveling direction side and the opposite direction side of the traveling direction of the moving body.
- the RRH forming a beam in a plurality of directions may be referred to as a bi-directional RRH (bi-directional RRH).
- the power is higher from the signal that the mobile body has undergone a negative Doppler shift in the middle of the two RRHs. It switches to a signal that has undergone a positive Doppler shift.
- the maximum change width of the Doppler shift that needs to be corrected is the change from ⁇ f D to + f D , which is twice as large as that in the case of unidirectional RRH.
- the tracking reference signal (TRS), DMRS and PDSCH are commonly transmitted (using resources of the same time / frequency) to the two TRPs (RRH) (normal SFN, transparent). (Transparent) SFN).
- the TRS is transmitted uniquely to the TRP (using resources at different times / frequencies depending on the TRP).
- TRP # 1 transmits TRS1
- TRP # 2 transmits TRS2.
- TRS and DMRS are transmitted uniquely to TRP.
- TRP # 1 transmits TRS1 and DMRS1
- TRP # 2 transmits TRS2 and DMRS2.
- Schemes 1 and 2 can suppress sudden changes in the Doppler shift as compared with Scheme 0, and can appropriately estimate / guarantee the Doppler shift. Since the DMRS of Scheme 2 is higher than the DMRS of Scheme 1, the maximum throughput of Scheme 2 is lower than that of Scheme 1.
- the present inventors have conceived a method of appropriately receiving RS from a plurality of transmission points.
- a / B / C and “at least one of A, B and C” may be read interchangeably.
- the cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as each other.
- the index, the ID, the indicator, and the resource ID may be read as each other.
- support, control, controllable, working, working may be read interchangeably.
- configuration, activate, update, indicate, enable, specify, and select may be read as each other.
- the upper layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, higher layers, higher layer parameters, RRC information elements (IE), and RRC messages may be read interchangeably.
- MAC CE MAC Control Element
- PDU MAC Protocol Data Unit
- the broadcast information includes, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), a minimum system information (Remaining Minimum System Information (RMSI)), and other system information ( Other System Information (OSI)) may be used.
- MIB Master Information Block
- SIB System Information Block
- RMSI Minimum System Information
- OSI Other System Information
- MAC CE and activation / deactivation commands may be read interchangeably.
- Domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, TCI state / QCL assumed QCL type D RS, TCI state / QCL assumed QCL type A RS, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be read as each other.
- the QCL type X-RS, the DL-RS associated with the QCL type X, the DL-RS having the QCL type X, the source of the DL-RS, the SSB, the CSI-RS, and the SRS may be read as each other. good.
- a panel an Uplink (UL) transmission entity, a TRP, a spatial relationship, a control resource set (COntrol REsource SET (CORESET)), a PDSCH, a code word, a base station, and an antenna port of a certain signal (for example, a reference signal for demodulation).
- DMRS Demo Division Reference Signal
- antenna port group of a certain signal for example, DMRS port group
- group for multiplexing for example, Code Division Multiplexing (CDM) group, reference signal group,
- the CORESET group the CORESET pool, the CW, the redundant version (redundancy version (RV)), and the layers (MIMO layer, transmission layer, spatial layer
- the panel Identifier (ID) and the panel may be read as each other.
- TRP ID and TRP may be read as each other.
- one of the two TCI states associated with one code point in the TRP, transmit point, panel, DMRS port group, CORESET pool, and TCI field may be read interchangeably.
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read as each other.
- multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be read as each other.
- single DCI, single PDCCH, single DCI-based multi-TRP, and activation of two TCI states on at least one TCI code point may be read interchangeably.
- no CORESETPoolIndex value of 1 being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as mutually exclusive. ..
- a multi-TRP a channel using a multi-TRP, a channel using a plurality of TCI states / spatial relationships, a multi-TRP being enabled by RRC / DCI, and a plurality of TCI states / spatial relationships being enabled by RRC / DCI.
- At least one of the multi-TRP based on the single DCI and the multi-TRP based on the multi-DCI may be read as each other.
- setting a CORESET pool index (CORESETPoolIndex) value of 1 for a multi-TRP and CORESET based on a multi-DCI may be read as interchangeable with each other.
- the mapping of at least one code point of a single DCI-based multi-TRP, TCI field to two TCI states may be read interchangeably.
- CSI-RS In the present disclosure, CSI-RS, NZP-CSI-RS, periodic (P) -CSI-RS, P-TRS, semi-persistent (SP) -CSI-RS, aperiodic (A) -CSI-RS, TRS, tracking.
- CSI-RS for, CSI-RS with TRS information (upper layer parameter trs-Info), NZP CSI-RS resource in NZP CSI-RS resource set with TRS information, multiple NZP-CSI-RS with the same antenna port
- the NZP-CSI-RS resources in the NZP-CSI-RS resource set consisting of resources may be read interchangeably.
- the CSI-RS resource, the CSI-RS resource set, the CSI-RS resource group, and the information element (IE) may be read as each other.
- DMRS Downlink Reference Signal
- DMRS port Downlink Reference Signal
- antenna port may be read as each other.
- Scheme 1 / Scheme 2 When Scheme 1 / Scheme 2 is set by the upper layer parameter, it may be specified that the UE is assumed to receive a plurality of TRP-specific TRS.
- the UE in which Scheme 1 / Scheme 2 is set may estimate / correct the Doppler shift using the TRS corresponding to each TRP, and may receive PDCCH / PDSCH using the estimation / correction result.
- At least one specific TRS is set by the upper layer parameter. If so, it may be specified that the UE receives a plurality of TRP-specific TRSs and assumes that the Doppler shift is estimated / guaranteed.
- An upper layer parameter (first upper layer parameter, NZP-CSI-RS resource set) indicating a resource of 15/16 TRS and an upper layer parameter (second upper layer parameter, for example, NZP-CSI) indicating a resource of a specific TRS. -RS resource set) and may be set (may be received).
- the upper layer parameter indicating the resource of the specific TRS is Rel.
- the parameters may be different from those of the 15/16 NZP-CSI-RS resource set, and Rel. It may be an NZP-CSI-RS resource set containing parameters different from the parameters of 15/16.
- the fact that the RSs are not the same and that the QCL relationship (QCL relationship, QCL type) between the existing TRS and the specific TRS does not include the Doppler shift may be read as each other.
- a new QCL type (eg, QCL type E) may be specified for TRP-specific TRS / specific TRS notification.
- the QCL type E relationship may be that the Doppler shifts are different and the receive space domain filters are equal.
- the existing TRS may be transmitted from a plurality of TRPs in common (using resources of the same time / frequency from a plurality of TRPs) (may be shared by a plurality of TRPs).
- the particular TRS may be transmitted uniquely to the TRP (from one TRP using resources at different times / frequencies than the other TRPs) (not necessarily shared by multiple TRPs).
- TRS1-1 to 1-4 are transmitted as existing TRS, and TRS2-1 to 2-4 are transmitted as specific TRS.
- TRS1-1 and TRS2-1 may have a QCL type E relationship.
- a specific TRS may be set for each TRP.
- the specific TRS may be transmitted from the corresponding TRP.
- TRPs # 1 and # 2 are TRPs before and after HST.
- TRS1-1 to 1-4 are transmitted as existing TRSs (TRP # 1 and TRP # 2)
- TRS2-1 to 2-4 are transmitted as specific TRSs for TRP # 1
- TRS3- as specific TRSs for TRP # 2. 1 to 3-4 are transmitted.
- TRS1-1 and TRS2-1 may have a QCL type E relationship.
- TRS2-1 and TRS3-1 may be in a QCL type E relationship.
- TRS1-1 and TRS3-1 may have a QCL type E relationship.
- TRS1-1 to 1-4 may be transmitted from TRP # 1 and # 2.
- TRS2-1 to 2-4 may be transmitted from TRP # 1.
- TRS3-1 to 3-4 may be transmitted from TRP # 2.
- the time / frequency resource of TRP1-1 and the time / frequency resource of TRP2-1 may be different from each other.
- the time / frequency resource of TRP2-1 and the time / frequency resource of TRP3-1 may be different from each other.
- the time / frequency resource of TRP1-1 and the time / frequency resource of TRP3-1 may be different from each other.
- An existing QCL type (eg, QCL type C / D) may be used for TRP-specific TRS / specific TRS notification.
- a QCL type C relationship may indicate that the Doppler shifts are equal, and a QCL type D relationship may indicate that the receive space domain filters are equal.
- TRS1-1 and 2-1 may have a QCL type D relationship instead of a QCL type C relationship.
- TRS2-1 and 3-1 may have a QCL type D relationship instead of a QCL type C relationship.
- TRS1-1 and 3-1 may have a QCL type D relationship instead of a QCL type C relationship.
- the UE can appropriately receive the TRS for each TRP.
- ⁇ Second embodiment> Scheme 1 and Scheme 2 have better performance than transparent SFN because the TRP-specific TRS improves the accuracy of Doppler shift estimation.
- Rel. 15 Consider backward compatibility from TRS.
- the network (NW, for example, a base station) is Rel.
- Rel. Supports 15 UEs and has a transparent SFN.
- 15 Send TRS. If Rel.
- the TRP-specific TRS after 17 is Rel. 15 If not shared with the TRS, the TRP-specific TRS increases the overhead of the TRS.
- M QCLs may be supported for a plurality of TRPs having a non-transparent SFN (non-SFN).
- the TRS may follow any of the following aspects 2-1 and 2-2.
- TRP # 1 transmits TRS1 and TRP # 2 transmits TRS2 (TRP-specific TRS).
- TRS of TRP-specific / non-transparent SFN may be transmitted and one TRS of transparent SFN may be transmitted. This one TRS is referred to as Rel. 15 May be shared with the UE. A total of M TRSs may be transmitted.
- TRP # 1 and TRP # 2 transmit TRS1 (transparent SFN), and TRP # 2 further transmits TRS2 (TRP-specific TRS).
- TRS1 is Rel. Since it is transmitted by 15 SFNs, Rel. 15/16 Can be shared with TRS for UE.
- UEs that support this aspect use TRS1 and 2 to estimate / correct Doppler shifts.
- the UE can appropriately receive the TRS for each TRP.
- the UE in which the scheme 2 is set may estimate / correct the Doppler shift using the TRS and DMRS corresponding to each TRP, and may receive the PDCCH / PDSCH using the estimation / correction result.
- the setting method of Scheme 2 may follow any of the following aspects 3-1 to 3-3.
- Scheme 2 may be explicitly set by higher layer parameters.
- a specific DMRS (additional DMRS, TRP specific DMRS, DMRS for specific TRP, additional DMRS resource, extended DMRS, second DMRS, new DMRS) may be set.
- a specific DMRS for PDSCH may be set in the PDSCH setting (PDSCH-Config, DMRS-DownlinkConfig, dmrs-AdditionalPosition).
- a specific DMRS for PDCCH may be set in the PDCCH setting (PDCCH-Config).
- a TRP-specific DMRS is received, a Doppler shift is not maintained (not identical) between an existing (Rel. 15/16) DMRS and a specific DMRS, and a specific QCL type between the existing DMRS and the specific DMRS.
- the fact that the RSs are not the same and that the QCL relationship (QCL relationship, QCL type) between the existing DMRS and the specific DMRS does not include the Doppler shift may be read as each other.
- the symbol number (index, position) for the specific DMRS may be explicitly set.
- the specific DMRS may be set for the symbols # 6 and # 9.
- the symbol number may be an index from the first symbol of the scheduled PDSCH or may be an index from the first symbol of the slot.
- the symbol number of the specific DMRS does not have to be explicitly set. For example, Rel.
- the additional DMRS of 3 symbols is set according to 15, the front-loaded DMRS of the symbol # 0 and the additional DMRS of the symbols # 3, # 6, and # 9 are arranged.
- the UE is referred to as Rel.
- Additional DMRS for symbol # 3 may be set according to 15. In this case, the UE assumes a preceding DMRS of symbol # 0 and an additional DMRS of symbol # 3, and further assumes a specific DMRS of symbols # 6 and # 9, and the Doppler shift of symbols # 6 and # 9 is the symbol #.
- These DMRSs may be received on the assumption that they are different from the Doppler shifts of 0 and # 3.
- the UE may assume that the Doppler shift of the DMRS peculiar to the second TRP is different from the Doppler shift of the DMRS peculiar to the first TRP.
- TRP-specific DMRS TRP-specific DMRS
- the first half of the plurality of symbols may be the DMRS peculiar to the first TRP
- the latter half of the plurality of symbols may be the second TRP. It may be a unique DMRS.
- the UE may assume a specific DMRS with the same number of symbols as the set DMRS.
- the UE has a number of symbols that is twice the number of symbols of the set DMRS.
- the arrangement of the preceding DMRS / additional DMRS and the specific DMRS may be determined according to the DMRS arrangement of 15/16.
- ⁇ Aspect 3-3 >> Rel.
- the DMRS of a plurality of symbols set according to 15/16 it may be set / instructed that the Doppler shift of a specific symbol is different from the Doppler shift of another symbol.
- the fact that the Doppler shift of a specific symbol is different from the Doppler shift of other symbols may be set for the PDSCH DMRS in the PDSCH setting, or may be set for the PDCCH DMRS in the PDCCH setting. It may be dynamically set / instructed by the combination of the upper layer and the scheduling DCI that the Doppler shift of a specific symbol is different from the Doppler shift of another symbol for the DMRS for PDSCH.
- Rel It may be set / instructed that the Doppler shift differs between the 15 predecessor DMRSs and the additional DMRSs.
- the DMRS multiplex capacity is increased by applying the double symbol DMRS and applying the time domain orthogonal cover code (OCC).
- OCC time domain orthogonal cover code
- the predecessor DMRS which is a double symbol DMRS, is mapped to two consecutive symbols.
- the number of additional DMRSs is 0 or 1, and the additional DMRSs are also mapped to two consecutive symbols. If the Doppler shift (channel) is different within the scope of the time domain OCC, the orthogonality of the time domain OCC is broken, and the time domain OCC cannot appropriately multiplex the DMRS (increase the number of DMRS ports).
- the time domain OCC may not be applied to the double symbol DMRS, and a specific OCC (eg, [for example, [ +1 and +1]) may only be applied.
- the DMRS of the first symbol of the double symbol DMRS may be usually called DMRS (first DMRS), and the DMRS of the second symbol may be called a specific DMRS (second DMRS).
- the DMRS type 1 double symbol DMRS is mapped to symbols # 0 and # 1, and the additional DMRS is mapped to symbols # 9 and # 10.
- Symbols # 1 and # 10 correspond to TRP # 1 (transmitted from TRP # 1)
- symbols # 0 and # 9 correspond to TRP # 2 (transmitted from TRP # 2).
- the Doppler shifts of symbols # 1 and # 10 are different from the Doppler shifts of symbols # 0 and # 9.
- the DMRS type 2 double symbol DMRS is mapped to symbols # 0 and # 1, and the additional DMRS is mapped to symbols # 9 and # 10.
- Symbols # 1 and # 10 correspond to TRP # 1 (transmitted from TRP # 1)
- symbols # 0 and # 9 correspond to TRP # 2 (transmitted from TRP # 2).
- the Doppler shifts of symbols # 1 and # 10 are different from the Doppler shifts of symbols # 0 and # 9.
- the UE may assume that the Doppler shift of the DMRS peculiar to the second TRP is different from the Doppler shift of the DMRS peculiar to the first TRP.
- TRP-specific DMRS TRP-specific DMRS
- the odd-numbered (first, third, ...) Symbol may be the first TRP-specific DMRS.
- the even-numbered (second, fourth, ...) Symbol may be the DMRS specific to the second TRP.
- the number of DMRS ports when the Doppler shift is different between the first symbol and the second symbol of the double symbol DMRS is Rel. It may be less than the number of DMRS ports on 15/16 (may be halved from the number of DMRS ports on Rel. 15/16).
- the maximum number of DMRS ports is 8 for DMRS type 1 and the maximum number of DMRS ports is 12 for DMRS type 2. If the time domain OCC is not applied, the maximum number of DMRS ports may be 4 for DMRS type 1 and 6 for DMRS type 2.
- the UE can appropriately receive the DMRS.
- the UE assumes multiple QCLs for one DMRS port on the PDSCH / PDCCH.
- RRC / MAC CE may set / indicate multiple TCI states for one CORESET for PDCCH.
- Two PDCCHs may correspond to two TCI states (two TRPs) respectively.
- the same DCI may be transmitted by two PDCCHs.
- the UE may receive two PDCCHs using two TCI states (QCL) or one PDCCH using one TCI state (QCL).
- the UE at time t1 assumes a TCI state 1 for RRH # 1 and a TCI state 2 for RRH # 2 for a DMRS port of a certain CORESET / PDSCH.
- One MAC CE may set / instruct one TCI state.
- TCI states may be set / instructed for one PDSCH by RRC / MAC CE / DCI.
- Two PDSCHs may correspond to two TCI states (two TRPs) respectively.
- the same DL data (transport block, code block group) may be transmitted by two PDSCHs.
- the UE may receive two PDSCHs using two TCI states (QCLs) or one PDSCH using one TCI state (QCL).
- the UE may generate one HARQ-ACK information (bit, HARQ-ACK codebook) for two PDSCHs and transmit the HARQ-ACK information.
- a plurality of TCI states may be set for one PDSCH by using the method of indicating the TCI state in the multi-TRP based on 16 single DCIs.
- PDSCH enhanced TCI state activation / deactivation MAC CE (Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) activates one or two TCI states per code point in the TCI field in DCI. And one code point may be indicated by the TCI field in DCI.
- TCI existence parameter (TCI-PresentInDCI) in DCI is not set, or if the time offset (scheduling offset) from DCI to PDSCH is less than or equal to the threshold value, the UE will perform Rel. Similar to 16, in the TCI DCI field, the lowest code point (TCI code point) with two active TCI states may be assumed as the PDSCH TCI state (default TCI state, two default TCI states).
- a plurality of TCI states are set by RRC, and the TCI states for each code point in the TCI field are activated by MAC CE (for example, Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE).
- DCI schedules PDSCH1 from TRP1 and PDSCH from TRP2. If the time offset between DCI and PDSCH1 and 2 is less than the threshold (timeDurationForQCL), the UE has two active TCI states (T0) for the lowest code point (001) of the TCI code points with two active TCI states. And T1) are used for receiving PDSCH1 and 2, respectively.
- the UE may assume that multiple TCI states are activated at at least one code point in the TCI's DCI field.
- the UE can appropriately determine the TCI state of PDCCH / PDSCH.
- UE capability corresponding to at least one function (feature) in the first to fourth embodiments may be defined. If the UE reports this UE capability, the UE may perform the corresponding function. If the UE reports this UE capability and the upper layer parameters corresponding to this function are set, the UE may perform the corresponding function. Upper layer parameters (RRC information elements) corresponding to this function may be specified. If this higher layer parameter is set, the UE may perform the corresponding function.
- the UE capability may indicate whether the UE supports this feature.
- the UE capability may indicate whether or not it supports HST.
- the UE capability may indicate whether or not it supports Scheme 1/2.
- the UE capability may indicate the maximum number of QCLs set for the same DMRS port.
- the maximum number of QCLs set for the same DMRS port may be two. In the specification, the maximum number of QCLs set for the same DMRS port may be greater than 2.
- scheme 1 and scheme 2 are specified in the specifications, and scheme 1 or scheme 2 may be instructed / switched by the upper layer.
- the UE can realize the above functions while maintaining compatibility with existing specifications.
- wireless communication system Wireless communication system
- communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.
- FIG. 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..
- the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs).
- MR-DC is a dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and a dual connectivity (NR-E) between NR and LTE.
- E-UTRA-NR Dual Connectivity Evolved Universal Terrestrial Radio Access (E-UTRA)
- NR-E dual connectivity
- NE-DC -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the base station (gNB) of NR is MN
- the base station (eNB) of LTE (E-UTRA) is SN.
- the wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )) May be supported.
- a plurality of base stations in the same RAT for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )
- NR-NR Dual Connectivity NR-DC
- gNB NR base stations
- the wireless communication system 1 includes a base station 11 that forms a macrocell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macrocell C1 and forms a small cell C2 that is narrower than the macrocell C1. You may prepare.
- the user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.
- the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.
- the user terminal 20 may be connected to at least one of a plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).
- CA Carrier Aggregation
- DC dual connectivity
- CC Component Carrier
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- the macrocell C1 may be included in FR1 and the small cell C2 may be included in FR2.
- FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR 2 may be in a frequency band higher than 24 GHz (above-24 GHz).
- the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
- the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- DL Downlink
- UL Uplink
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple. Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the wireless access method may be called a waveform.
- another wireless access system for example, another single carrier transmission system, another multi-carrier transmission system
- the UL and DL wireless access systems may be used as the UL and DL wireless access systems.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- a broadcast channel Physical Broadcast Channel (PBCH)
- a downlink control channel Physical Downlink Control
- PDSCH Physical Downlink Control
- the uplink shared channel Physical Uplink Shared Channel (PUSCH)
- the uplink control channel Physical Uplink Control Channel (PUCCH)
- the random access channel shared by each user terminal 20 are used.
- Physical Random Access Channel (PRACH) Physical Random Access Channel or the like may be used.
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
- User data, upper layer control information, and the like may be transmitted by the PUSCH.
- the Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.
- DCI Downlink Control Information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, or the like, and the DCI that schedules PUSCH may be called UL grant, UL DCI, or the like.
- the PDSCH may be read as DL data, and the PUSCH may be read as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource for searching DCI.
- the search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates).
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set.
- the "search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. of the present disclosure may be read as each other.
- channel state information (Channel State Information (CSI)
- delivery confirmation information for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request (Scheduling Request).
- Uplink Control Information including at least one of SR)
- the PRACH may transmit a random access preamble to establish a connection with the cell.
- downlinks, uplinks, etc. may be expressed without “links”. Further, it may be expressed without adding "Physical" to the beginning of various channels.
- a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DeModulation Demodulation reference signal
- Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like.
- SS, SSB and the like may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS Uplink Reference Signal
- UE-specific Reference Signal UE-specific Reference Signal
- FIG. 10 is a diagram showing an example of the configuration of a base station according to an embodiment.
- the base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140.
- the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.
- the functional block of the characteristic portion in the present embodiment is mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
- the control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 120.
- the control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
- the transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure. be able to.
- the transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
- the transmitting / receiving antenna 130 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 120 processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 120 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. Processing (if necessary), inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-analog transformation may be performed, and the baseband signal may be output.
- channel coding may include error correction coding
- modulation modulation
- mapping mapping, filtering
- DFT discrete Fourier Transform
- IFFT inverse Fast Fourier Transform
- precoding coding
- transmission processing such as digital-analog transformation
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..
- the transmission / reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.
- the transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) for the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmission / reception unit 120 may perform measurement on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal.
- the measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)).
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- Signal strength for example, Received Signal Strength Indicator (RSSI)
- propagation path information for example, CSI
- the measurement result may be output to the control unit 110.
- the transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10, etc., and user data (user plane data) for the user terminal 20 and a control plane. Data or the like may be acquired or transmitted.
- the transmission unit and the reception unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the transmission / reception unit 120 may transmit a first upper layer parameter indicating a resource of the first tracking reference signal (TRS) and a second upper layer parameter indicating a resource of the second TRS.
- the control unit 110 may control at least one transmission of the first TRS and the second TRS.
- the pseudo-collocation relationship between the first TRS and the second TRS may not include Doppler shift.
- FIG. 11 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- the user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230.
- the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.
- the functional block of the feature portion in the present embodiment is mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230.
- the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.
- the transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure.
- the transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
- the transmitting / receiving antenna 230 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 220 processes, for example, PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- the transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output a baseband signal.
- Whether or not to apply the DFT process may be based on the transform precoding setting.
- the transmission / reception unit 220 transmits the channel using the DFT-s-OFDM waveform.
- the DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.
- the transmission / reception unit 220 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..
- the transmission / reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.
- the transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmission / reception unit 220 may perform measurement on the received signal.
- the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal.
- the measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement result may be output to the control unit 210.
- the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.
- the transmission / reception unit 220 indicates a first upper layer parameter indicating a resource of the first tracking reference signal (TRS) (existing TRS, TRS peculiar to the first TRP) and a resource of the second TRS (specific TRS, TRS peculiar to the second TRP).
- the second upper layer parameter may be received.
- the control unit 210 has a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on the first TRS and the second TRS (for example, the estimation result of the channel / Doppler shift based on the first TRS and the second TRS). ) May be controlled.
- the pseudo-collocation relationship (QCL relationship, QCL type) between the first TRS and the second TRS may not include a Doppler shift.
- the first upper layer parameter indicates the release 15 non-zero power channel state information reference signal (NZP-CSI-RS) resource set
- the second upper layer parameter is the release 15 NZP-CSI-RS resource set. It may have different parameters (first and second embodiments).
- the transmission / reception unit 220 includes a first demodulation reference signal (DMRS) (existing DMRS, DMRS specific to the first TRP) for the physical downlink shared channel and a second DMRS (specific DMRS, second TRP) for the physical downlink shared channel.
- DMRS demodulation reference signal
- second DMRS specific DMRS, second TRP
- Unique DMRS and may be received.
- the pseudo-collocation relationship between the first DMRS and the second DMRS may not include Doppler shift (third embodiment).
- the transmission / reception unit 220 receives a setting or instruction of a plurality of transmission setting instruction (TCI) states for any one of one DMRS port, one control resource set, and the physical downlink shared channel.
- TCI transmission setting instruction
- each functional block is realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (configuration unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the realization method is not particularly limited.
- the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 12 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors.
- the processor 1001 may be mounted by one or more chips.
- the processor 1001 For each function in the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
- predetermined software program
- the processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
- CPU central processing unit
- control unit 110 210
- transmission / reception unit 120 220
- the like may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- the control unit 110 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.
- the memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one.
- the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, and is, for example, a flexible disk, a floppy disk (registered trademark) disk, an optical magnetic disk (for example, a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, etc.). At least one of Blu-ray® discs), removable discs, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers and other suitable storage media. May be configured by.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 has, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). May be configured to include.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmission / reception unit 120 (220) may be physically or logically separated by the transmission unit 120a (220a) and the reception unit 120b (220b).
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings.
- channels, symbols and signals may be read interchangeably.
- the signal may be a message.
- the reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard.
- the component carrier CC may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.
- the wireless frame may be configured by one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- the subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
- Numerology is, for example, subcarrier interval (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, wireless frame configuration.
- SCS subcarrier Spacing
- TTI Transmission Time Interval
- a specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols in the time area (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). Further, the slot may be a time unit based on numerology.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may include a plurality of mini slots.
- Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot.
- a minislot may consist of a smaller number of symbols than the slot.
- the PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
- the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.
- the time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.
- one subframe may be called TTI
- a plurality of consecutive subframes may be called TTI
- one slot or one minislot may be called TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. May be.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- a TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, or the like.
- the long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms
- the short TTI eg, shortened TTI, etc.
- TTI having the above TTI length may be read as TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- one or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB. It may be called a pair or the like.
- the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples.
- the number of subframes contained in a radio frame the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
- the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented.
- the radio resource may be indicated by a given index.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers.
- Information, signals, etc. may be input / output via a plurality of network nodes.
- Input / output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.
- the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method.
- the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or combinations thereof. May be carried out by.
- DCI downlink control information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
- CE MAC Control Element
- the notification of predetermined information is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).
- the determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website where software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the terms “system” and “network” used in this disclosure may be used interchangeably.
- the “network” may mean a device (eg, a base station) included in the network.
- precoding "precoding weight”
- QCL Quality of Co-Co-Location
- TCI state Transmission Configuration Indication state
- space "Spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, "antenna port”, “antenna port group”, “layer”, “number of layers”
- Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, "antenna”, “antenna element", “panel” are compatible.
- base station BS
- wireless base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- Reception point Reception Point
- TRP Transmission / Reception Point
- Panel , "Cell”, “sector”, “cell group”, “carrier”, “component carrier” and the like
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (eg, 3) cells.
- a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio). Communication services can also be provided by Head (RRH))).
- RRH 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 that provides communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , Handset, user agent, mobile client, client or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read by the user terminal.
- the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the user terminal 20 may have the function of the base station 10 described above.
- words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
- the upstream channel, the downstream channel, and the like may be read as a side channel.
- the user terminal in the present disclosure may be read as a base station.
- the base station 10 may have the functions of the user terminal 20 described above.
- the operation performed by the base station may be performed by its upper node (upper node) in some cases.
- various operations performed for communication with a terminal are a base station, one or more network nodes other than the base station (for example,).
- Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.
- Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, integer, fraction)
- Future Radio Access FAA
- RAT New -Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- LTE 802.11 Wi-Fi®
- LTE 802.16 WiMAX®
- LTE 802.20 Ultra-WideBand (UWB), Bluetooth®, and other suitable radios. It may be applied to a system using a communication method, a next-generation system extended based on these, and the like.
- UMB Ultra-WideBand
- references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.
- determining used in this disclosure may include a wide variety of actions.
- judgment (decision) means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment”.
- judgment (decision) includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as “determining” such as “accessing” (for example, accessing data in memory).
- judgment (decision) is regarded as “judgment (decision)” such as resolution, selection, selection, establishment, and comparison. May be good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of some action.
- the "maximum transmission power" described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal UE maximum transmit power, or may mean the rated maximum transmission power (the). It may mean rated UE maximum transmit power).
- connection are any direct or indirect connections or connections between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “bonded” to each other.
- the connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- the radio frequency domain microwaves. It can be considered to be “connected” or “coupled” to each other using frequency, electromagnetic energy having wavelengths in the region, light (both visible and invisible) regions, and the like.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
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Abstract
Description
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
・QCLタイプA(QCL-A):ドップラーシフト、ドップラースプレッド、平均遅延及び遅延スプレッド、
・QCLタイプB(QCL-B):ドップラーシフト及びドップラースプレッド、
・QCLタイプC(QCL-C):ドップラーシフト及び平均遅延、
・QCLタイプD(QCL-D):空間受信パラメータ。
RRC接続モードにおいて、DCI内TCI情報(上位レイヤパラメータTCI-PresentInDCI)が「有効(enabled)」とセットされる場合と、DCI内TCI情報が設定されない場合と、の両方において、DL DCI(PDSCHをスケジュールするDCI)の受信と、対応するPDSCH(当該DCIによってスケジュールされるPDSCH)と、の間の時間オフセットが、閾値(timeDurationForQCL)より小さい場合(適用条件、第1条件)、もし非クロスキャリアスケジューリングの場合、PDSCHのTCI状態(デフォルトTCI状態)は、その(特定UL信号の)CCのアクティブDL BWP内の最新のスロット内の最低のCORESET IDのTCI状態であってもよい。そうでない場合、PDSCHのTCI状態(デフォルトTCI状態)は、スケジュールされるCCのアクティブDL BWP内のPDSCHの最低のTCI状態IDのTCI状態であってもよい。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(multi TRP(MTRP)))が、1つ又は複数のパネル(マルチパネル)を用いて、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対して、1つ又は複数のパネルを用いて、UL送信を行うことが検討されている。
LTEにおいて、HSTのトンネルにおける配置が難しい。ラージアンテナはトンネル外/内への送信を行う。例えば、ラージアンテナの送信電力は1から5W程度である。ハンドオーバのために、UEがトンネルに入る前にトンネル外に送信することが重要である。例えば、スモールアンテナの送信電力は250mW程度である。同じセルIDを有し300mの距離を有する複数のスモールアンテナ(送受信ポイント)はsingle frequency network(SFN)を形成する。SFN内の全てのスモールアンテナは、同じPRB上の同じ時間において同じ信号を送信する。端末は1つの基地局に対して送受信すると想定する。実際は複数の送受信ポイントが同一のDL信号を送信する。高速移動時には、数kmの単位の送受信ポイントが1つのセルを形成する。セルを跨ぐ場合にハンドオーバが行われる。これによって、ハンドオーバ頻度を低減することができる。
<第1の実施形態>
スキーム1及びスキーム2の両方が仕様に規定されてもよい。
TRP固有TRSがドップラーシフトの推定の精度を向上させるため、スキーム1及びスキーム2は、透過的SFNより優れた性能を有する。ここで、Rel.15 TRSからの後方互換性を検討する。ネットワーク(NW、例えば基地局)はRel.15 UEをサポートし、透過的SFNを有するRel.15 TRSを送信する。もしRel.17以降におけるTRP固有TRSがRel.15 TRSと共有されないと、TRP固有TRSによってTRSのオーバーヘッドが増大する。
TRP固有/非透過的SFNの、M個のTRSが送信されてもよい。Rel.15をサポートするために、透過的SFNのTRSが追加されてもよい。全体でM+1個のTRSが送信されてもよい。図4Aの例において、TRP#1はTRS1を送信し、TRP#2はTRS2を送信する(TRP固有TRS)。
TRP固有/非透過的SFNの、M-1個のTRSが送信され、透過的SFNの1個のTRSが送信されてもよい。この1個のTRSは、Rel.15 UEと共有されてもよい。全体でM個のTRSが送信されてもよい。図4Bの例において、TRP#1及びTRP#2はTRS1を送信し(透過的SFN)、TRP#2は更にTRS2を送信する(TRP固有TRS)。TRS1はRel.15のSFNによって送信されるため、Rel.15/16 UE用TRSと共通化できる。この態様をサポートするUEは、TRS1及び2を用いて、ドップラーシフトを推定/補正する。
スキーム2を設定されたUEは、各TRPに対応するTRS及びDMRSを用いてドップラーシフトの推定/補正を行い、推定/補正の結果を用いてPDCCH/PDSCHを受信してもよい。
スキーム2が上位レイヤパラメータによって明示的に設定されてもよい。
第1の実施形態の特定TRSと同様、特定DMRS(追加(additional)DMRS、TRP固有DMRS、特定TRP用DMRS、追加DMRSリソース、拡張DMRS、第2DMRS、新規DMRS)が設定されてもよい。PDSCH設定(PDSCH-Config、DMRS-DownlinkConfig、dmrs-AdditionalPosition)内においてPDSCH用特定DMRSが設定されてもよい。PDCCH設定(PDCCH-Config)内においてPDCCH用特定DMRSが設定されてもよい。
Rel.15/16に従って設定された複数のシンボルのDMRSのうち、特定シンボルのドップラーシフトが他のシンボルのドップラーシフトと異なることが設定/指示されてもよい。
スキーム1/2において、UEは、PDSCH/PDCCHの1つのDMRSポートに対して複数のQCLを想定する。
第1から第4の実施形態における少なくとも1つの機能(特徴、feature)に対応するUE能力(capability)が規定されてもよい。UEがこのUE能力を報告した場合、UEは、対応する機能を行ってもよい。UEがこのUE能力を報告し、且つこの機能に対応する上位レイヤパラメータを設定された場合、UEは、対応する機能を行ってもよい。この機能に対応する上位レイヤパラメータ(RRC情報要素)が規定されてもよい。この上位レイヤパラメータが設定された場合、UEは、対応する機能を行ってもよい。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図10は、一実施形態に係る基地局の構成の一例を示す図である。基地局10は、制御部110、送受信部120、送受信アンテナ130及び伝送路インターフェース(transmission line interface)140を備えている。なお、制御部110、送受信部120及び送受信アンテナ130及び伝送路インターフェース140は、それぞれ1つ以上が備えられてもよい。
図11は、一実施形態に係るユーザ端末の構成の一例を示す図である。ユーザ端末20は、制御部210、送受信部220及び送受信アンテナ230を備えている。なお、制御部210、送受信部220及び送受信アンテナ230は、それぞれ1つ以上が備えられてもよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
なお、本開示において説明した用語及び本開示の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル、シンボル及び信号(シグナル又はシグナリング)は、互いに読み替えられてもよい。また、信号はメッセージであってもよい。参照信号(reference signal)は、RSと略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(Component Carrier(CC))は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 第1トラッキング参照信号(TRS)のリソースを示す第1上位レイヤパラメータと、第2TRSのリソースを示す第2上位レイヤパラメータと、を受信する受信部と、
前記第1TRS及び第2TRSに基づいて、物理下りリンク制御チャネル及び物理下りリンク共有チャネルの少なくとも1つの受信を制御する制御部と、を有し、
前記第1TRS及び前記第2TRSの間の疑似コロケーション関係は、ドップラーシフトを含まない、端末。 - 前記第1上位レイヤパラメータは、リリース15のノンゼロパワーチャネル状態情報参照信号(NZP-CSI-RS)リソースセットを示し、前記第2上位レイヤパラメータは、前記リリース15のNZP-CSI-RSリソースセットと異なるパラメータである、請求項1に記載の端末。
- 前記受信部は、前記物理下りリンク共有チャネル用の第1復調参照信号(DMRS)と、前記物理下りリンク共有チャネル用の第2DMRSと、を受信し、
前記第1DMRS及び前記第2DMRSの間の疑似コロケーション関係は、ドップラーシフトを含まない、請求項1又は請求項2に記載の端末。 - 前記受信部は、1つのDMRSポートと、1つの制御リソースセットと、前記物理下りリンク共有チャネルと、のいずれかに対する、複数の送信設定指示(TCI)状態の設定又は指示を受信する、請求項1から請求項3のいずれかに記載の端末。
- 第1トラッキング参照信号(TRS)のリソースを示す第1上位レイヤパラメータと、第2TRSのリソースを示す第2上位レイヤパラメータと、を受信するステップと、
前記第1TRS及び第2TRSに基づいて、物理下りリンク制御チャネル及び物理下りリンク共有チャネルの少なくとも1つの受信を制御するステップと、を有し、
前記第1TRS及び前記第2TRSの間の疑似コロケーション関係は、ドップラーシフトを含まない、端末の無線通信方法。 - 第1トラッキング参照信号(TRS)のリソースを示す第1上位レイヤパラメータと、第2TRSのリソースを示す第2上位レイヤパラメータと、を送信する送信部と、
前記第1TRS及び第2TRSの少なくとも1つの送信を制御する制御部と、を有し、
前記第1TRS及び前記第2TRSの間の疑似コロケーション関係は、ドップラーシフトを含まない、基地局。
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