Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes a reception unit that receives information indicating a plurality of transmission configuration indication (TCI) states for the same demodulation reference signal (DMRS) port for a physical downlink shared channel (PDSCH), and a control unit that determines at least one of a TCI state and resource allocation for each of a plurality of PDSCHs carrying the same downlink data based on downlink control information. According to one embodiment of the present disclosure, downlink data from a plurality of transmission points can be appropriately received.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. BACKGROUND

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, and so on (Non-Patent Literature 1). Further, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further large capacity, higher height, and so on of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] A subsequent system of LTE (for example, also referred to as a 5th generation mobile communication system (5G), 5G (plus), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also being researched.

[0004] PRIOR ART DOCUMENTS

[0005] NON-PATENT LITERATURE

[0006] Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In a future wireless communication system (for example, NR), it is envisaged that, for the purpose of realizing wireless communication in a mobile body (for example, a train or the like) moving at a high speed, a beam transmitted from a transmission point (for example, a Remote Radio Head (RRH)) configured to a path of the mobile body is utilized.

[0009] However, how a terminal receives downlink data transmitted from a plurality of transmission points has not been sufficiently studied. If such operation is unclear, throughput can be reduced or the like.

[0010] Therefore, an object of the present disclosure is to provide a terminal that appropriately receives downlink data from a plurality of transmission points, a wireless communication method, and a base station.

[0011] Means for solving the problem

[0012] A terminal according to an aspect of the present disclosure includes a reception unit that receives information indicating a plurality of transmission configuration indication (TCI) states for a same demodulation reference signal (DMRS) port for a physical downlink shared channel (PDSCH), and a control unit that determines at least one of a TCI state and a resource allocation for each of a plurality of PDSCHs carrying a same downlink data based on downlink control information.

[0013] Effects of the invention

[0014] According to an aspect of the present disclosure, downlink data from a plurality of transmission points can be appropriately received. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1A And Figure 1A is a diagram illustrating an example of communication of a mobile body with a transmission point (e.g., RRH).

[0016] Figure 2A And Figure 2B is a diagram illustrating an example of PDSCH from a plurality of RRHs.

[0017] Figure 3 is a diagram illustrating an example of an extended TCI state activation / deactivation MAC CE for a UE-specific PDSCH.

[0018] Figures 4A-4C is a diagram illustrating an example of resource allocation of two PDSCHs.

[0019] Figure 5 is a diagram illustrating an example of a determination method of TDRA / FDRA.

[0020] Figure 6 is a diagram illustrating an example of a scheduling method 4.

[0021] Figure 7 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.

[0022] Figure 8 is a diagram illustrating an example of a structure of a base station according to an embodiment.

[0023] Figure 9 Fig. 1 is a diagram showing an example of a structure of a user terminal according to an embodiment.

[0024] Figure 10 Fig. 2 is a diagram showing an example of a hardware structure of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0025] (HST)

[0026] In NR, the following is assumed: in order to perform communication 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, a beam transmitted from a transmission point (for example, RRH) is utilized. In the existing system (for example, Rel. 15), communication with a moving body is supported by transmitting a beam in one direction from an RRH (refer to Figure 1A ).

[0027] Figure 1A In Fig. 1, a case where an RRH is provided along a moving path (or, moving direction, traveling direction, running path) of a moving body, and a beam is formed to the traveling direction side of the moving body from each RRH is shown. An RRH that forms a beam in one direction can also be referred to as a uni-directional RRH. Figure 1A In the example shown in Fig. 1, the moving body receives a negative Doppler shift (-f D ) from each RRH.

[0028] Note that, here, a case where a beam is formed to the traveling direction side of the moving body is shown, but this is not limiting, and a beam can also be formed to the opposite direction of the traveling direction, or a beam can be formed to all directions regardless of the traveling direction of the moving body.

[0029] In Rel. 16 and later, it is also assumed that a plurality of (for example, two or more) beams are transmitted from an RRH. For example, it is assumed that a beam is formed to both the traveling direction of the moving body and the opposite direction of the traveling direction (refer to Figure 1B ).

[0030] Figure 1B In Fig. 2, a case where an RRH is provided along a moving path of a moving body, and a beam is formed to both the traveling direction side of the moving body and the opposite direction side of the traveling direction from each RRH is shown. An RRH that forms a beam in a plurality of directions (for example, two directions) can also be referred to as a bi-directional RRH.

[0031] Figure 1BIn the example shown, the mobile body is in the middle of two RRHs (here, RRH #1 and RRH #2), and switches from receiving a signal with a negative Doppler shift to receiving a signal with a positive Doppler shift with a higher power. In this case, the maximum Doppler shift that needs to be corrected becomes a change in the range of -f D to +f D Compared to the case of a single-direction RRH, this becomes twice as large.

[0032] In the future, it is expected that communication in a mobile body moving at a speed of 500 km / h or more will be supported using a plurality of RRHs configured along the moving path (without the assistance of a macro cell).

[0033] On the other hand, it is difficult to properly perform control of beam control and switching and the like in the case of high-speed movement of a mobile body.

[0034] For example, beam control of a conventional system (for example, Rel. 15 or earlier) is performed, for example, in a procedure of L1-RSRP reporting, beam notification (TCI state (TCI state), spatial relation (spatial relation) setting or activation), and determination of a reception beam. However, it is difficult to perform this series of procedures (for example, notification of a TCI state or QCL assumption and the like) in a short passage using the method of the conventional system.

[0035] Furthermore, switching control is performed, for example, in a procedure of measurement reporting (L3-RSRP, L3-SINR reporting), switching instruction, random access channel transmission, and RRC connection end, but it is difficult to perform this series of procedures in a short passage.

[0036] (TCI, spatial relation, QCL)

[0037] In NR, it is being studied to control at least one of reception processing (for example, at least one of reception, demapping, demodulation, and decoding) and transmission processing (for example, at least one of transmission, mapping, precoding, modulation, and coding) in a UE of a signal and a channel (expressed as a signal / channel) based on a transmission configuration indication state (TCI state).

[0038] A TCI state can also indicate an element applied to a signal / channel of a downlink. An element equivalent to a TCI state applied to a signal / channel of an uplink can also be expressed as a spatial relation.

[0039] A TCI state is information related to Quasi-Co-Location (QCL) of a signal / channel, and can also be referred to as spatial reception parameter, spatial relation information, etc. A TCI state can also be configured to a UE per channel or per signal.

[0040] QCL is an index indicating a statistical property of a signal / channel. For example, it can mean that, in a case where a certain signal / channel is in a QCL relationship with another signal / channel, it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, a spatial parameter (e.g., a spatial Rx parameter) is the same (about at least one of them is QCL) among the different plurality of signals / channels.

[0041] In addition, the spatial reception parameter can also correspond to a receive beam (e.g., a receive analog beam) of the UE, and the beam can also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure can also be replaced by sQCL (spatial QCL).

[0042] Regarding QCL, a plurality of types (QCL types) can also be specified. For example, four QCL types A-D of parameters (or parameter sets) that can be assumed to be the same can also be set, and the parameter (which can also be referred to as a QCL parameter) is expressed as follows:

[0043] • QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0044] • QCL Type B (QCL-B): Doppler shift and Doppler spread,

[0045] • QCL Type C (QCL-C): Doppler shift and average delay,

[0046] • QCL Type D (QCL-D): Spatial reception parameter.

[0047] The UE can also be referred to as a QCL assumption in the case where a certain control resource set (CORESET), channel, or reference signal is assumed to be in a specific QCL relationship (e.g., QCL Type D) with another CORESET, channel, or reference signal.

[0048] The UE can also determine at least one of a transmission beam (Tx beam) and a reception beam (Rx beam) of the signal / channel based on the TCI state or the QCL assumption of the signal / channel.

[0049] The TCI state can also be information related to a QCL of a channel (in other words, a reference signal (RS) for the channel) that is the object and another signal (e.g., another RS), for example. The TCI state can be configured (indicated) through higher layer signaling, physical layer signaling, or a combination thereof.

[0050] The physical layer signaling can be downlink control information (Downlink Control Information (DCI)), for example.

[0051] The channel for which the TCI state or spatial relation is configured (specified) can be at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)), for example.

[0052] Further, the RS in the QCL relationship with the channel can also be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (sounding reference signal (SRS)), a tracking CSI-RS (also referred to as a tracking reference signal (TRS)), and a QCL detection reference signal (also referred to as a QRS).

[0053] The SSB is a signal block including at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The SSB can also be referred to as an SS / PBCH block.

[0054] The RS of the QCL type X of the TCI state can also refer to a RS in a QCL type X relationship with the DMRS of a certain channel / signal, which can also be referred to as a QCL source of the QCL type X of the TCI state.

[0055] (Path loss RS)

[0056] Path loss PL in the transmission power control of each of PUSCH, PUCCH, and SRS b、f、c (q d [dB] is calculated by the UE using an index q of a reference signal (RS, path loss reference RS) for a downlink BWP associated with an active UL BWP b of a carrier f of a serving cell c d In the present disclosure, the path loss reference RS, path loss (PL)-RS, index q d , RS used in path loss calculation, RS resource used in path loss calculation can also be replaced with each other. In the present disclosure, calculation, estimation, measurement, tracking can also be replaced with each other.

[0057] It is being studied whether to change the existing mechanism of a higher layer filtered RSRP for path loss measurement in the case where the path loss RS is updated by a MAC CE.

[0058] Also, in a case where the path loss RS is updated by the MAC CE, the L1-RSRP-based path loss measurement can be applied. Also, in a timing at which the MAC CE for the update of the path loss RS can be utilized, the higher layer filtered RSRP can be used in the path loss measurement, and the L1-RSRP can be used in the path loss measurement before the higher layer filtered RSRP is applied. Also, in a timing at which the MAC CE for the update of the path loss RS can be utilized, the higher layer filtered RSRP can be used in the path loss measurement, and the RSRP of the path loss RS before the higher layer filtering thereof is used before the timing. Also, the higher layer filtered RSRP can be used in the path loss measurement as in the operation of Rel. 15, and the UE tracks all path loss RS candidates set by the RRC. The maximum number of path loss RSs that can be set by the RRC can also depend on the UE capability. Also, in a case where the maximum number of path loss RSs that can be set by the RRC is X, path loss RS candidates up to X are set by the RRC, and a path loss RS is selected from the set path loss RS candidates by the MAC CE. The maximum number of path loss RSs that can be set by the RRC can also be 4, 8, 16, 64, etc.

[0059] In the disclosure, the higher layer filtered RSRP, the filtered RSRP, and the layer 3 filtered RSRP can be replaced with each other.

[0060] (Default TCI state / default spatial relation / default PL-RS)

[0061] In the RRC connected mode, in both a case where the TCI information in DCI (a higher layer parameter TCI-PresentInDCI) is set to "enabled" and a case where the TCI information in DCI is not set, when a time offset between the reception of the DL DCI (DCI scheduling the PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than a threshold (timeDurationForQCL) (application condition, first condition), if in a case of non-cross carrier scheduling, the TCI state of the PDSCH (default TCI state) can also be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of its (of the specific UL signal) CC. In the case of not being such, the TCI state of the PDSCH (default TCI state) can also be the TCI state of the lowest TCI state ID of the PDSCH in the active DL BWP of the scheduled CC.

[0062] In Rel. 15, separate MAC CEs for activation / deactivation of PUCCH spatial relation and for activation / deactivation of SRS spatial relation are needed. PUSCH spatial relation follows SRS spatial relation.

[0063] In Rel. 16, at least one of the MAC CEs for activation / deactivation of PUCCH spatial relation and for activation / deactivation of SRS spatial relation can not be used.

[0064] If in FR2, neither the spatial relation for PUCCH nor the PL-RS is configured (application condition, second condition), the default assumption of spatial relation and PL-RS for PUCCH is applied (default spatial relation and default PL-RS). If in FR2, neither the spatial relation for SRS (SRS resource for SRS, or SRS resource corresponding to SRI in DCI format 0_1 scheduling PUSCH) nor the PL-RS is configured (application condition, second condition), the default assumption of spatial relation and PL-RS is applied (default spatial relation and default PL-RS) for PUSCH and SRS scheduled by DCI format 0_1.

[0065] If CORESET is configured within the activated DL BWP on the CC, the default spatial relation and the default PL-RS can also be the TCI state or the QCL assumption of the CORESET with the lowest CORESET ID within the activated DL BWP. If no CORESET is configured within the activated DL BWP on the CC, the default spatial relation and the default PL-RS can also be the activated TCI state with the lowest ID of PDSCH within the activated DL BWP.

[0066] In Rel. 15, the spatial relation of PUSCH scheduled by DCI format 0_0 follows the spatial relation of the PUCCH resource with the lowest PUCCH resource ID in the activated spatial relation of PUCCH on the same CC. In case PUCCH is not transmitted on SCell, the network also needs to update the PUCCH spatial relation on all SCells.

[0067] In Rel. 16, PUCCH configuration for PUSCH scheduled by DCI format 0_0 is not needed. For PUSCH scheduled by DCI format 0_0, if there is no activated PUCCH spatial relation or no PUCCH resource on the activated UL BWP within its CC (application condition, second condition), the default spatial relation and the default PL-RS are applied for the PUSCH.

[0068] The above threshold value can also be referred to as a 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", scheduling offset threshold, scheduling offset threshold, and the like.

[0069] (Multi-TRP)

[0070] In NR, it is being studied that one or a plurality of transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP (MTRP)) performs DL transmission to a UE using one or a plurality of panels (multi-panel). Further, it is being studied that a UE performs UL transmission to one or a plurality of TRPs using one or a plurality of panels.

[0071] In addition, a plurality of TRPs can also correspond to the same cell identifier (cell Identifier (ID)), or can correspond to different cell IDs. The cell ID can also be a physical cell ID, or a virtual cell ID.

[0072] The multi-TRP (for example, TRP #1, #2) can also be connected by an ideal / non-ideal backhaul, and exchange information, data, and the like. Different code words (Code Word (CW)) and different layers can also be transmitted from each of the TRPs of the multi-TRP, respectively. As one of the ways of multi-TRP transmission, non-coherent joint transmission (Non-Coherent Joint Transmission (NCJT)) can also be used.

[0073] In NCJT, for example, TRP #1 modulates and maps a first code word and performs layer mapping, and transmits a first PDSCH using a first precoding for a first number of layers (for example, 2 layers). Further, TRP #2 modulates and maps a second code word and performs layer mapping, and transmits a second PDSCH using a second precoding for a second number of layers (for example, 2 layers).

[0074] In addition, multiple PDSCHs (multi-PDSCH) by NCJT can be defined as being partially or completely repeated with respect to at least one of the time domain and the frequency domain. In other words, at least one of the time resources and the frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP can also be repeated.

[0075] It can also be envisaged that the first PDSCH and the second PDSCH are not in a quasi-co-located (QCL) relationship. The reception of the multi-PDSCH can also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).

[0076] Multiple PDSCHs (which can also be referred to as multi-PDSCH) from multiple TRPs can also be scheduled using 1 DCI (single DCI, single PDCCH) (single master mode). Multiple PDSCHs from multiple TRPs can also be scheduled using multiple DCIs (multi-DCI, multiple PDCCH) respectively (multi-master mode).

[0077] According to such a multi-TRP scenario, more flexible transmission control using a good-quality channel can be performed.

[0078] In order to support multi-TRP transmission within a cell (intra-cell, with the same cell ID) and between cells (inter-cell, with different cell IDs) based on multiple PDCCHs, in the RRC configuration information for linking multiple PDCCHs and PDSCH pairs with multiple TRPs, one control resource set (CORESET) within the PDCCH configuration information (PDCCH-Config) can also correspond to one TRP.

[0079] (HST-SFN scenario)

[0080] Support for extensions of the HST-single frequency network (SFN) configuration scenario as follows is being studied.

[0081] • QCL assumption operation for DMRS (for example, multiple QCL assumptions for the same DMRS port for the purpose of DL-only transmission).

[0082] • By extending HST in Rel. 16, re-use the unified TCI framework, QCL or QCL-like relationship between DL and UL signals (including the QCL types that can be applied and the requirements for association).

[0083] The requested time between two TRPs / RRHs / antennas (distance 200m, 300m) and between two beams (64 beams are assumed for each TRP / RRH / antenna) is as follows.

[0084] • For distance 200m, the requested time between two TRPs is 1.44s and between two beams is 22.5ms.

[0085] • For distance 300m, the requested time between two TRPs is 2.16s and between two beams is 33.75ms.

[0086] According to this calculated time scales, there is sufficient time for the change of TCI state (beam) based on DCI for PDSCH for beam switching and there is also sufficient time for the change of TCI state based on MAC CE for PDCCH.

[0087] The existing next beam switching notification framework for PDCCH / PDSCH can be basically re-used.

[0088] • Indication / update of TCI state for PDSCH based on RRC, MAC CE and DCI.

[0089] • Indication / update of TCI state for PDCCH / PDSCH based on RRC and MAC CE.

[0090] In Rel. 16, for the antenna port field of DCI format 1_1, a new DMRS table (new antenna port indication table) is specified for single-DCI based multi-PDSCH (multi-TRP) transmission.

[0091] In the case of two TCI states indicated within the codepoint of the DCI field “Transmission Configuration Indication” and DM-RS ports within two code division multiplexing (CDM) groups of the DCI field “antenna ports”, the first TCI state corresponds to the first antenna port indicated by the antenna port indication table and the CDM group, and the second TCI state corresponds to the other CDM group.

[0092] In multi-PDSCH transmission based on a single DCI, the TCI field within the DCI can indicate one or two TCI states used by the PDSCH DMRS. If two TCI states are indicated, these two TCI states correspond to different CDM groups of the DMRS.

[0093] The new MAC CE in NR Rel.16 supports the activation of one or two TCI states for each code point within the TCI field of the DCI.

[0094] To improve HST performance, we are investigating (using different QCLs / beams) multiple TRPs / RRHs to simultaneously transmit multiple PDSCHs (same code word (CW)) / transport blocks (TB)) to one UE.

[0095] like Figure 2A As shown, consider the mobile unit (UE) receiving beams (PDSCH) from two RRHs (TRPs). Figure 2B The PDSCH scenario 1 in the example is supported in NR Rel.16 using multi-PDSCH NCJT transmission based on single DCI and multiple DCI. In multi-PDSCH transmission based on multiple DCI, two DL data (CW / TB) can also be transmitted. In multi-PDSCH transmission based on single DCI, one or two DL data (CW / TB) can also be transmitted. PDSCH from different TRPs can also be transmitted using different layers. For example, PDSCH from TRP#1 can be transmitted using layers 1 to x, and PDSCH from TRP#2 can be transmitted using layers x+1 to M (layers different from TRP#1).

[0096] Figure 2B The PDSCH scenario 2 in the example is not supported in NR Rel.16, but it is valid for HST-SFN scenarios. To improve reliability, the same DL data (same data / CW / TB / PDSCH) can also be transmitted from multiple TRPs. PDSCH from different TRPs can also be transmitted using the same layers. For example, PDSCH from TRP #1 and PDSCH from TRP #2 can both be transmitted using layers 1 through x (the same layers).

[0097] However, the operations used to support PDSCH scenario 2 are still unclear. For example, the QCL assumption (DMRS assumption) in PDSCH scenario 2 is not yet clear. If such operations are unclear, it could potentially lead to reduced throughput, etc.

[0098] Therefore, the inventors of this invention conceived of operations in cases where the same downlink data is transmitted from multiple sending points.

[0099] Hereinafter, the embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. The structures described in each of the embodiments can be applied individually, or can be applied in combination.

[0100] In the present disclosure, a panel, an uplink (UL) transmission entity, a transmission point, a transmission reception point (TRP), an RRH, an antenna, a beam, a QCL assumption, a TCI state, a spatial relation, a control resource set (CORESET), a PDSCH, a codeword, a base station, an antenna port of a certain signal (for example, a DeModulation Reference Signal (DMRS) port), a group of antenna ports of a certain signal (for example, a DMRS port group), a group for multiplexing (for example, a Code Division Multiplexing (CDM) group, a reference signal group, a CORESET group), a CORESET pool, a CW, a redundancy version (RV), a layer (MIMO layer, transmission layer, spatial layer) can also be replaced with each other. In addition, a panel identifier (ID) and a panel can also be replaced with each other. In the present disclosure, a TRP ID and a TRP can also be replaced with each other.

[0101] In the present disclosure, a beam, a TCI state, a QCL assumption, a QCL parameter, a spatial domain reception filter, a UE spatial domain reception filter, a UE receive beam, a DL receive beam, a DL precoding, a DL precoder, a DL-RS, a RS of a QCL type D of a TCI state or a QCL assumption, a RS of a QCL type A of a TCI state or a QCL assumption can also be replaced with each other. In the present disclosure, a QCL type X-RS, a DL-RS associated with a QCL type X, a DL-RS having a QCL type X, a source of a DL-RS, an SSB, a CSI-RS can also be replaced with each other.

[0102] In the present disclosure, a TCI state can also be information related to a reception beam (spatial domain reception filter) indicated (set) for a UE (for example, a DL-RS, a QCL type, a cell of a transmitted DL-RS, etc.). A QCL assumption can also be information related to a reception beam (spatial domain reception filter) assumed by a UE based on transmission or reception of a signal for association (for example, a PRACH) (for example, a DL-RS, a QCL type, a cell of a transmitted DL-RS, etc.).

[0103] In the present disclosure, the mobile body can move at a certain speed or more, and can be, for example, a train, an automobile, a motorcycle, a ship, or the like. Further, communication between the UE included in the mobile body and the transmission point (for example, RRH) can be performed directly between the UE and the transmission point, or can be performed between the UE and the transmission point via the mobile body (for example, an antenna or the like provided in the mobile body).

[0104] Further, in the present disclosure, the UE included in the mobile body (HST) can be referred to simply as a UE.

[0105] Further, in the present disclosure, "A / B" can be replaced with at least one of A and B, and "A / B / C" can be replaced with at least one of A, B, and C. In the present disclosure, a cell, a CC, a carrier, a BWP, an activated DL BWP, an activated UL BWP, a band can be replaced with each other. In the present disclosure, an RRC parameter, a higher layer parameter, an RRC information element (IE), an RRC message can be replaced with each other. In the present disclosure, an index, an ID, an indicator, a resource ID, and the like can be replaced with each other.

[0106] In the present disclosure, support, control, controllable, operation, operable can be replaced with each other.

[0107] In the present disclosure, activate, update, indicate, activate (enable), specify can be replaced with each other.

[0108] In the present disclosure, downlink (DL) data, CW, TB, PDSCH can be replaced with each other.

[0109] (Wireless communication method)

[0110] In each embodiment, a case where the same DL data is transmitted from two transmission points (TRPs, RRHs) is described, but the number of transmission points is not limited to two, and can be three or more.

[0111] In each embodiment, a plurality of PDSCHs can be transmitted from one or more transmission points (TRPs, RRHs) configured on a moving path.

[0112] <First embodiment>

[0113] The UE can support the setting / indication of up to X (X is one or a plurality, for example, X = 2) QCL / TCI states for the same DMRS port for PDSCH reception (for each layer) in one UE.

[0114] A new PDSCH transmission mode using 1 or more TCI states configured / indicated for the same DMRS port of PDSCH can also be defined. In the present disclosure, the new PDSCH transmission mode, 1 or more TCI states configured / indicated for the same DMRS port of PDSCH, and multiple TCI states configured / indicated for the same DMRS port of PDSCH can also be replaced with each other. The new PDSCH transmission mode can also be configured / indicated by at least one of the following options 1 to 3.

[0115] [Option 1]

[0116] The new PDSCH transmission mode is configured by RRC.

[0117] [Option 2]

[0118] The new PDSCH transmission mode is indicated by MAC CE. For example, the new PDSCH transmission mode can also be indicated together with TCI state activation / deactivation for UE-specific PDSCH. The reserved ('R') bit (R = 1) within the 'Extended TCI state activation / deactivation MAC CE for UE-specific PDSCH' re-used from Rel. 16 can also mean that the UE assumes two TCI states for all DMRS ports of PDSCH reception if two TCI states are activated for one TCI codepoint within DCI.

[0119] The MAC CE can also include a reserved bit R, a serving cell ID, a BWP ID, a C i、2 indicating the presence of a TCI state ID i , and a TCI state ID i、j . In the case where the TCI state i、2 is present, C i is set to 1, and in the case where this is not true, C i is set to 0. The TCI state ID i、j indicates a TCI state ID identified by a higher layer parameter (TCI-StateId). i is the index of the codepoint of the TCI field of DCI. The TCI state ID i、j indicates the j-th TCI state shown by the i-th codepoint of the TCI field.

[0120] Figure 3In the example of FIG. 1, in the case of R = 1, the TCI states corresponding to each codepoint of the TCI field within the DCI are applied to all DMRS ports of the PDSCH. In the case of R = 0, two TCI states corresponding to one codepoint of the TCI field within the DCI are indicated for Rel. 16 operation, the two TCI states being applied to different CDM groups of the PDSCH DMRS.

[0121] [Option 3]

[0122] The new PDSCH transmission mode is indicated by the DCI. The new PDSCH transmission mode can also be explicitly indicated by a new 1-bit within the DCI. The new PDSCH transmission mode can also be implicitly indicated. For example, for this mode, an additional DAI field of the RRC setting with ACKNACKFeedbackMode = JointFeedback is re-used. For this mode, the setting of ACKNACKFeedbackMode is not a problem. This mode has an impact on the number of bits of the downlink assignment indicator (DAI).

[0123] The semi-static change between the new PDSCH transmission mode, the Rel. 16 based single-DCI multi-PDSCH transmission mode, the Rel. 16 based multi-DCI multi-PDSCH transmission mode can also be achieved by Option 1 and / or Option 2.

[0124] The dynamic change between the new PDSCH transmission mode and the Rel. 16 based single-DCI multi-PDSCH transmission mode can also be achieved by Option 3.

[0125] X can also be > 2.

[0126] According to the first implementation above, one or multiple TCI states can be appropriately set / indicated for the same DMRS port.

[0127] <Second Implementation>

[0128] The antenna port index table for PDSCH DMRS (antenna port table, DMRS table) can also be used in the new PDSCH transmission mode.

[0129] The antenna port index table can also follow either of the following Options 1, 2.

[0130] [Option 1]

[0131] The antenna port index table for the new PDSCH transmission mode can also be defined / fixed in the specification.

[0132] The antenna port index table for the new PDSCH transmission mode can also follow any one of the following options 1-1 to 1-3.

[0133] [[Option 1-1]]

[0134] The antenna port index table for the new PDSCH transmission mode can also be the antenna port index table of Rel. 15 (Table 7.3.1.2.2-1 / 2 / 3 / 4).

[0135] <<Example of Option 1-1>>

[0136] In the case where the UE is configured / indicated the new PDSCH transmission mode, the UE uses Table 7.3.1.2.2-1 / 2 / 3 / 4. In the case where this is not so, in the case where the UE receives an activation command (MAC CE) that maps at least one codepoint of the DCI field of TCI to two TCI states, the UE uses Table 7.3.1.2.2-1A / 2A / 3A / 4A.

[0137] [[Option 1-2]]

[0138] The antenna port index table for the new PDSCH transmission mode can also be the antenna port index table of Rel. 16 (Table 7.3.1.2.2-1A / 2A / 3A / 4A).

[0139] <<Example of Option 1-2>>

[0140] In the case where the UE is configured / indicated the new PDSCH transmission mode or in the case where the UE receives an activation command (MAC CE) that maps at least one codepoint of the DCI field of TCI to two TCI states, the UE uses Table 7.3.1.2.2-1A / 2A / 3A / 4A. In the case where this is not so, the UE uses Table 7.3.1.2.2-1 / 2 / 3 / 4.

[0141] [[Option 1-3]]

[0142] In the case where all (each) codepoint of the DCI field of TCI in the MAC CE is mapped to one TCI state, the UE can also use the antenna port index table of Rel. 15. In the case where at least one codepoint of the DCI field of TCI in the MAC CE is mapped to two TCI states, the UE can also use the antenna port index table of Rel. 16.

[0143] <<Example of Option 1-3>>

[0144] In a case where the UE receives an activation command (MAC CE) in which at least 1 codepoint of the DCI field of TCI is mapped to two TCI states, the UE uses Table 7.3.1.2.2-1A / 2A / 3A / 4A. In a case where this is not so, the UE uses Table 7.3.1.2.2-1 / 2 / 3 / 4.

[0145] [Option 2]

[0146] The antenna port index table for the new PDSCH transmission mode can also be configured to the UE.

[0147] The antenna port index table for the new PDSCH transmission mode can also follow any one of the following options 2-1, 2-2.

[0148] [[Option 2-1]]

[0149] Either of the antenna port index table of Rel. 15 and the antenna port index table of Rel. 16 can also be configured to the UE.

[0150] [[Option 2-2]]

[0151] In a case where at least 1 codepoint of the DCI field of TCI in the MAC CE is mapped to two TCI states, the UE can also be configured only one of the antenna port index table of Rel. 15 and the antenna port index table of Rel. 16. In a case where all (each) codepoint of the DCI field of TCI in the MAC CE is mapped to 1 TCI state, the UE can also use the antenna port index table of Rel. 15. In this case, the UE can also not be configured the antenna port index table for the new PDSCH transmission mode.

[0152] According to the above second embodiment, the UE can use an appropriate antenna port index table for the new PDSCH transmission mode.

[0153] <Third Embodiment>

[0154] The UE operation of PDSCH DMRS reception can also be defined in the new PDSCH transmission mode.

[0155] In a case where the UE is configured / indicated the new PDSCH transmission mode (1 or more TCI states for the same DMRS port of PDSCH), in a case where two TCI states are indicated in 1 codepoint of the DCI field of TCI, the two TCI states can also correspond to all DMRS ports indicated by the antenna port index table.

[0156] In a case where the UE is configured / indicated a new PDSCH transmission mode (more than one TCI state for the same DMRS port of PDSCH), one or two TCI states indicated in one codepoint of the DCI field of TCI correspond to all DMRS ports indicated by the Antenna Port Indication Table.

[0157] According to the above third embodiment, the UE can appropriately receive the PDSCH DMRS.

[0158] <Fourth Embodiment>

[0159] A PDSCH with a default QCL can also be defined in a case where the DCI does not contain the TCI field or in a case where the scheduling offset is less than a threshold (timeDurationForQCL).

[0160] In a case where the existing single-DCI-based framework is reused for scheduling of the new PDSCH transmission mode, the PDSCH with a default QCL can also be the same as in NR Rel. 16.

[0161] The UE can also be configured / indicated a new PDCCH transmission mode for PDCCH QCL extension for HST-SFN. For the new PDCCH transmission mode, one CORESET can also be configured / activated / indicated one or more TCI states. The one or more TCI states for the CORESET can also be configured / activated / indicated by at least one of RRC and MAC CE. The multiple TCI states can also be two TCI states.

[0162] In a case where the new PDCCH transmission mode is configured / indicated and two TCI states are configured / indicated for at least one CORESET, the UE can also follow at least one of the following procedures 1, 2.

[0163] [Procedure 1]

[0164] In a case where the TCI presence information (tci-PresectInDCI) is set to valid (enabled) within the DCI, the offset (time offset) between the DL DCI (DCI scheduling the PDSCH) and the corresponding PDSCH is less than a threshold (timeDurationForQCL), and the TCI state configured for at least one of the serving cells of the scheduled PDSCH contains "QCL Type D", the UE follows either of the following procedures 1-1, 1-2.

[0165] [[Procedure 1-1]] (same as Rel. 16)

[0166] Also, in case at least 1 TCI codepoint indicates two TCI states, the UE assumes that the DMRS ports of PDSCH of the serving cell are quasi co-located with the RS associated with the QCL parameter of the TCI state corresponding to the lowest codepoint among the TCI codepoint containing two different TCI states.

[0167] [[Procedure 1-2]] (New rule (e.g., Rel. 17))

[0168] Also, in case at least 1 CORESET is indicated two TCI states, the UE assumes that the DMRS ports of PDSCH of the serving cell are quasi co-located with the RS associated with the QCL parameter of the TCI state corresponding to the lowest CORESET ID among the CORESET indicated two different TCI states.

[0169] [Procedure 2]

[0170] If in case PDSCH is scheduled by DCI format not containing TCI field, the UE can also follow any one of the following procedures 2-1 to 2-3.

[0171] [[Procedure 2-1]] (New rule (e.g., Rel. 17))

[0172] The UE can also assume that the TCI state or QCL assumption for the CORESET used in PDCCH transmission is the same as the TCI state or QCL assumption for PDSCH regardless of how many TCI states or QCL assumptions are applied. Here, the CORESET is indicated one or two TCI states.

[0173] [[Procedure 2-2]] (New rule (e.g., Rel. 17))

[0174] The UE can also assume that the two TCI states or QCL assumptions for PDSCH are the same as the two TCI states or QCL assumptions corresponding to the lowest CORESET ID among the CORESET indicated two different TCI states.

[0175] [[Procedure 2-3]] (New rule (e.g., Rel. 17))

[0176] If the offset (time offset) between the DL DCI and its corresponding PDSCH is above the threshold (timeDurationForQCL), the UE can also assume process 2-1. If the offset (time offset) between the DL DCI and its corresponding PDSCH is less than the threshold, the UE can also assume process 2-2.

[0177] The settings / indicators for the new PDCCH transmission mode and the settings / indicators for the new PDSCH transmission mode can be separate settings / indicators or common settings / indicators.

[0178] It can also be defined as at least one of the following UE capabilities 1 and 2.

[0179] [UE Capability 1]

[0180] Does the UE support multiple (e.g., two) TCI states for the same DMRS port used by PDSCH (for each layer)?

[0181] [UE Capability 2]

[0182] The maximum number of TCI states for the same DMRS port used by PDSCH (for each layer). This maximum number can also be reported if the maximum number is greater than 2.

[0183] When a new PDSCH transmission mode is set / instructed, information related to beam shifting can also be used. This can also refer to the order or pattern of QCL shifting set / instructed for the new PDSCH transmission mode.

[0184] The UE can also control the reception of DL transmissions sent from the TRP (transmitting point) based on beam shift information. Beam shift can also be interchanged with TCI state shift or QCL shift. Beam shift information can also be notified to the UE via RRC signaling and at least one slave network (e.g., base station, transmitting point) of MAC CE, or it can be predefined in the specification.

[0185] Information related to beam shifting may also include at least one of the following: information related to the shift of TCI state, the period corresponding to each beam (also known as beam period or beam time), and the period corresponding to RRH (also known as RRH period or RRH time). Furthermore, the period or time may be specified in units of at least one of symbols, time slots, sub-time slots, subframes, and frames, or in units of ms or μm. The period or time may also be replaced with distance or angle.

[0186] The information related to the transition of the TCI state (e.g., TCI#n→TCI#n+1) can also be the transition / ordering / index of the TCI state. The period corresponding to the beam can also be the duration / dwell-time of the beam. The period corresponding to the transmission point (RRH) can also be the duration / dwell-time of the RRH.

[0187] Also, in each order or pattern, one or two TCI states can be configured corresponding to all DMRS ports for PDSCH reception.

[0188] According to the aforementioned time scale analysis, the beam indication based on the DCI for PDSCH can be operated, and thus, the order or pattern in which the QCL transition is not required for PDSCH can also be possible.

[0189] According to the above fourth embodiment, the UE can appropriately determine the parameters related to the QCL of PDSCH.

[0190] < Fifth Embodiment >

[0191] If the new PDSCH transmission mode is configured / indicated, the resource allocation of the same DL data from multiple TRPs can also follow any one of the following resource allocations 1 to 3.

[0192] [Resource allocation 1]

[0193] The time / frequency resource allocation is completely overlapped. Figure 4A In the example of PDSCH 1, 2 scheduled by 1 DCI, the time and frequency resources are completely overlapped.

[0194] Also, in the case where QCL Type D is configured / indicated in at least one TCI state for PDSCH reception, the case where complete overlap is supported can also be possible.

[0195] [Resource allocation 2]

[0196] The time / frequency resource allocation is partially overlapped. Figure 4B In the example of PDSCH 1, 2 scheduled by 1 DCI, the time / frequency resources are partially overlapped.

[0197] Also, in the case where QCL Type D is configured / indicated in at least one TCI state for PDSCH reception, the case where partial overlap is supported can also be possible.

[0198] [Resource allocation 3]

[0199] The resource allocation of time / frequency does not overlap. Figure 4C In the example of PDSCH 1, 2 scheduled by 1 DCI, the resource of time / frequency does not overlap.

[0200] In the resource allocation 1, 2, in the case where the spatial separation is sufficiently good for the beams from two TRPs, the inter-TRP interference is small. If it is indicated in at least one TCI state for PDSCH reception QCL Type D, the resource allocation 1, 2 can also be supported.

[0201] Also, in the single-DCI-based scheduling, for the resource allocation 2, 3, the DCI is extended to indicate multiple resource allocations (RAs, TDRA / FDRA) / rate matching (RMs, rate matching indicators (RMI)) / QCLs (TCI states) indicated by the single DCI. The RA / RM / QCL for the PDSCH from the multiple TRPs can be indicated separately, or can be indicated jointly.

[0202] For the new PDSCH transmission mode, all of the resource allocations 1 to 3 can be supported. At least one of the resource allocations 1 to 3 can be supported.

[0203] The UE can obtain a synthesis gain for the same DL data from the multiple TRPs.

[0204] The PDSCH transmission from the multiple TRPs can be scheduled by the single DCI according to any one of the following scheduling methods 1 to 4.

[0205] [Schedule method 1]

[0206] The UE is configured with a higher layer parameter for one TRP, and applies a common value (a value for one TRP) indicated by a DCI field to the multiple TRPs.

[0207] [Schedule method 2]

[0208] The UE is configured with a higher layer parameter for the multiple TRPs, and applies a common value (a value for one TRP) indicated by a DCI field to the multiple TRPs.

[0209] [Schedule method 3]

[0210] The UE is configured with a higher layer parameter for the multiple TRPs, and applies a value (a value for the number of scheduled TRPs, a value for each TRP) indicated by an extended DCI field to each TRP.

[0211] Figure 5 In an example of the above, the UE is configured a list of multiple configurations of TDRA / FDRA. Each configuration within the list is associated with a field value (codepoint) of TDRA / FDRA within the DCI. The DCI contains a field of TDRA / FDRA for PDSCH0 from TRP#0 and a field of TDRA / FDRA for PDSCH1 from TRP#1. The field of TDRA / FDRA indicates one configuration in the list.

[0212] For example, in case of 3 bits per TRP’s DCI field, the DCI field for two TRPs is 6 bits. Thus, the scheduling for each TRP is flexible. In order to determine the number of bits before blind detection of the DCI, the number of scheduled TRPs can also be configured by a higher layer parameter or can be specified in the specification.

[0213] The DCI field size can also be the number of TRPs times the DCI field size for one TRP. The DCI field size for each TRP can also be the existing DCI field size (e.g., 3 bits) or can be smaller than the existing DCI field size (e.g., 2 bits).

[0214] The DCI field size for a specific TRP is the existing DCI field size (e.g., 3 bits) and the DCI field size for other TRPs can also be smaller than the existing DCI field size (e.g., 2 bits).

[0215] [Method of scheduling 4]

[0216] The UE is configured a higher layer parameter for one TRP and derives the value for other TRPs from the value for the one TRP indicated by the DCI field. For example, the UE derives the value for other TRPs by adding an offset to the value for the one TRP indicated by the DCI field.

[0217] The offset can also be an offset in the time direction for TDRA or an offset in the frequency direction for FDRA. Figure 6 In an example of the above, the offset can also be at least one of a time offset from the time (e.g., the slot / symbol of the start or end) of PDSCH#0 to the time (e.g., the start or end) of PDSCH#1 and a frequency offset from the frequency (e.g., the lowest PRB) of PDSCH#0 to the frequency (e.g., the lowest or highest PRB / subcarrier) of PDSCH#1.

[0218] The offset can also be specified by the specification, configured by a higher layer parameter, or reported as a UE capability.

[0219] Multiple offsets can also be specified / set / reported. The UE can also use one of multiple offsets (and can switch one of multiple offsets) based on at least one of the number of PDSCHs supported by the UE, the number of TRPs supported by the UE, the number of beams set, and the UE moving speed.

[0220] The DCI field in the scheduling methods 1-4 can also be at least one of TCI state, TDRA, and FDRA.

[0221] Here, the case where the PRBs of two PDSCHs from two TRPs overlap (resource allocations 1 and 2) is compared with the case where they do not overlap (resource allocation 3).

[0222] In the case where the PRBs completely overlap (resource allocation 1), the time / frequency resources of the two PDSCHs are the same, and thus, in single DCI, the extension of TDRA / FDRA and the extension of the DCI field for time / frequency indication do not need to be extended (the same as single DCI for enhanced Mobile Broad Band (eMBB) of Rel. 16).

[0223] In the case where the PRBs do not overlap (resource allocation 3), the time / frequency resources of the two PDSCHs are different, and thus, in single DCI, the extension of TDRA / FDRA and the extension of the DCI field for time / frequency indication are needed.

[0224] A UE that supports the new PDSCH transmission mode can also be assumed to have PRBs of two PDSCHs from two TRPs that do not overlap.

[0225] The expected value of the received power in the case where the PRBs of two PDSCHs from two TRPs do not overlap can be twice the expected value of the received power of a single TRP.

[0226] In the case where the PRBs overlap, the UE receives a complex received signal y = h1s1 + h2s1 = (h1 + h2)s1. The UE can obtain h1 and h2 through channel estimation for each PDSCH. Here, each DMRS is orthogonal (for example, included in different CDM groups). The UE obtains (h1 + h2) by multiplying the received signal by (h1 + h2) ＊ y (h1 + h2) ＊ = (h1 + h2) (h1 + h2) ＊ = |h1 + h2| 2 s1. h ＊ is the complex conjugate of h. The expected value (ensemble average) of this received power is |s1| 2 .

[0227] In the case where PRBs do not overlap, the UE receives complex received signals y1 = h1s1 and y2 = h2s1 on each PDSCH resource. The UE can obtain h1, h2 by channel estimation of each PDSCH. Here, each DMRS is orthogonal (for example, included in different CDM groups). For the first PDSCH, the UE obtains y1h1 = h1h1 ＊ by multiplying the received signal y1 and h1 ＊ s1 = |h1| 2 s1. For the second PDSCH, the UE obtains y2h2 = h2h2 ＊ by multiplying the received signal y2 and h2 ＊ s1 = |h2| 2 s1. The UE obtains |h1| 2 s1 + |h2| 2 s1 by coherently combining the two received signals. The expected value (overall average) of this received power is 2|s1| 2 .

[0228] In the case where PRBs do not overlap, there is a 2-fold power gain for single-TRP. In the case where PRBs overlap, there is no power gain for single-TRP. Therefore, the main use case prefers the case where PRBs do not overlap. This use case can also be a use case for HST, a case where resource utilization efficiency is not so important.

[0229] For a UE with multiple panels, in the case where the UE can use different panels in reception from different analog beams from different TRPs (in the case where the UE has multiple panels in frequency range (FR) 2 and the correlation of paths between the multiple panels is small), it is considered that the spatial isolation for the two beams is sufficiently good. In this case, the UE considers that it can distinguish the channels (h1, h2) from the two beams even on the same time / frequency resource for decoding. In this case, the UE can obtain h1s1 from panel 1 and h2s2 from panel 2 (instead of obtaining only h = h1 + h2). The same degree of performance as in the case where PRBs do not overlap can be obtained.

[0230] Therefore, in the fifth embodiment, the restriction in the case where QCL Type D is designated can also be added in at least one TCI state for PDSCH reception. In the case of analog beamforming reception using different panels (QCL Type D), the case where PRBs overlap can obtain the same degree of gain as in the case where they do not overlap.

[0231] According to the above fifth embodiment, the UE can appropriately acquire information related to scheduling of PDSCHs from multiple TRPs.

[0232] (Wireless communication system)

[0233] Hereinafter, a configuration of a wireless communication system to which one embodiment of the present disclosure relates will be described. In the wireless communication system, any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof is used for communication.

[0234] Figure 7 is a diagram illustrating an example of a schematic configuration of a wireless communication system to which one embodiment relates. The wireless communication system 1 can also be a system that achieves communication by Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0235] Further, the wireless communication system 1 can also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). The MR-DC can include dual connectivity of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0236] In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Secondary Node (SN). In NE-DC, a base station (gNB) of NR is an MN, and a base station (eNB) of LTE (E-UTRA) is an SN.

[0237] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, both the MN and the SN are dual connectivity of base stations (gNBs) of NR (NR-NR dual connectivity (NN-DC))).

[0238] The wireless communication system 1 can also have a base station 11 that forms a macro cell C1 with a wider coverage, and base stations 12 (12a-12c) that are configured within the macro cell C1 and form small cells C2 that are narrower than the macro cell C1. The user terminal 20 can also be located within at least one cell. The configuration, number, and the like of the cells and the user terminal 20 are not limited to the manner shown in the drawing. Hereinafter, the base stations 11 and 12 are collectively referred to as base stations 10 without distinction.

[0239] The user terminal 20 can also be connected to at least one of the multiple base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0240] Each CC can be included in at least one of a first frequency band (frequency range 1 (FR1)) and a second frequency band (frequency range 2 (FR2)). The macro cell C1 can be included in the FR1, and the small cell C2 can be included in the FR2. For example, the FR1 can be a frequency band of 6 GHz or less (sub-6 GHz), and the FR2 can be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited thereto, and for example, the FR1 can correspond to a frequency band higher than the FR2.

[0241] Furthermore, the user terminal 20 can use at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC to communicate.

[0242] The plurality of base stations (e.g., RRHs) 10 can also be connected through wired (e.g., optical fiber based on Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between the base stations 11 and 12 is utilized as a backhaul, the base station 11 equivalent to an upper station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay can also be referred to as an IAB node.

[0243] The base stations 10 can also be connected to the core network 30 via other base stations 10 or directly. The core network 30 can also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0244] The user terminals 20 can also be terminals that support at least one of LTE, LTE-A, 5G, etc.

[0245] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can also be utilized. For example, in at least one of Downlink (DL) and Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can also be utilized.

[0246] The wireless access scheme can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access schemes (e.g., other single carrier transmission schemes, other multi-carrier transmission schemes) can also be applied in the wireless access schemes of UL and DL.

[0247] In the wireless communication system 1, as a downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared among the user terminals 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and the like can also be used.

[0248] Further, in the wireless communication system 1, as an uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared among the user terminals 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like can also be used.

[0249] User data, higher layer control information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, and the like can also be transmitted through the PUSCH. Further, a Master Information Block (MIB) can also be transmitted through the PBCH.

[0250] Lower layer control information can also be transmitted through the PDCCH. The lower layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0251] In addition, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, or the like, and the DCI that schedules the PUSCH can also be referred to as an UL grant, an UL DCI, or the like. In addition, the PDSCH can also be replaced with DL data, and the PUSCH can also be replaced with UL data.

[0252] In the detection of the PDCCH, a control resource set (CORESET) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area of the PDCCH candidate and a search method. One CORESET can also be associated with one or a plurality of search spaces. The UE can also monitor the CORESET associated with a certain search space based on a search space setting.

[0253] One search space can also correspond to the PDCCH candidate corresponding to one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", and the like of the present disclosure can also be replaced with each other.

[0254] The uplink control information (UCI) including at least one of the channel state information (CSI), the delivery confirmation information (for example, also referred to as a hybrid automatic repeat request acknowledgement (HARQ-ACK), ACK / NACK, and the like), and the scheduling request (SR) can also be transmitted through the PUCCH. The random access preamble for establishing a connection with the cell can also be transmitted through the PRACH.

[0255] In addition, in the present disclosure, the downlink, the uplink, and the like can also be expressed without the "link". Furthermore, it can also be expressed without the "physical" at the beginning of various channels.

[0256] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like can also be transmitted.

[0257] The synchronization signal can be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), or the like. In addition, the SS, the SSB, and the like can also be referred to as a reference signal.

[0258] Furthermore, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), and the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0259] (Base station)

[0260] Figure 8is a drawing showing an example of a structure 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 path interface (transmission line interface) 140. Note that the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 can each be provided more than one.

[0261] In the present example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, but it is also conceivable that the base station 10 has other functional blocks required for wireless communication. Part of the processing of each unit described below can also be omitted.

[0262] The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0263] The control unit 110 can also control generation of signals, scheduling (for example, resource allocation, mapping), and the like. The control unit 110 can also control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, a sequence, and the like transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0264] The transmission / reception unit 120 can include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 can include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be configured by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0265] The transmission / reception unit 120 can be configured as an integrated transmission / reception unit, or can be configured by a transmission unit and a reception unit. The transmission unit can be configured by the transmission processing unit 1211 and the RF unit 122. The reception unit can be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0266] The transmission / reception antenna 130 can be constituted by an antenna such as an array antenna and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0267] The transmission / reception unit 120 can also transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 120 can also receive the uplink channel, the uplink reference signal, and the like described above.

[0268] The transmission / reception unit 120 can also form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

[0269] The transmission / reception unit 120 (transmission processing unit 1211) can also generate a bit string to be transmitted, for example, by performing processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 110.

[0270] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing of channel coding (which can include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-analog conversion, and the like, with respect to the bit string to be transmitted, and output a baseband signal.

[0271] The transmission / reception unit 120 (RF unit 122) can also perform modulation to a wireless band, filter processing, amplification, and the like, with respect to the baseband signal, and transmit a signal of the wireless band via the transmission / reception antenna 130.

[0272] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to a baseband signal, and the like, with respect to a signal of the wireless band received by the transmission / reception antenna 130.

[0273] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data.

[0274] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can also measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 110.

[0275] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 and other base stations 10, and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0276] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure may also be composed of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0277] The transmission / reception unit 120 can also transmit information indicating a plurality of transmission configuration indication (TCI) states for the same demodulation reference signal (DMRS) port for reception of a physical downlink shared channel (PDSCH). The control unit 110 can also control transmission of a plurality of PDSCHs carrying the same downlink data using the plurality of TCI states.

[0278] The transmission / reception unit 120 can also transmit information indicating a plurality of transmission configuration indication (TCI) states for the same demodulation reference signal (DMRS) port for reception of a physical downlink shared channel (PDSCH). The control unit 110 can also control transmission of a plurality of PDSCHs carrying the same downlink data using the plurality of TCI states.

[0279] (user terminal)

[0280] Figure 9 is a diagram indicating an example of a structure of a user terminal according to an embodiment. The user terminal 20 is provided with a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 can be provided.

[0281] In addition, in the present example, mainly functional blocks of the characteristic part in the present embodiment are shown, and it can also be assumed that the user terminal 20 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below can also be omitted.

[0282] The control unit 210 implements control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0283] The control unit 210 can also control generation, mapping, and the like of signals. The control unit 210 can also control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, a sequence, and the like transmitted as signals, and forward them to the transmission / reception unit 220.

[0284] The transmission / reception unit 220 can also include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can also include a transmission processing unit 2211, a reception processing unit 2212. The transmission / reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0285] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be configured of a transmission unit and a reception unit. The transmission unit can be configured of the transmission processing unit 2211, the RF unit 222. The reception unit can be configured of the reception processing unit 2212, the RF unit 222, the measurement unit 223.

[0286] The transmission / reception antenna 230 can be configured of an antenna such as an array antenna, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0287] The transmission / reception unit 220 can also receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 220 can also transmit the above-described uplink channel, uplink reference signal, and the like.

[0288] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like, to form at least one of a transmission beam and a reception beam.

[0289] The transmission / reception unit 220 (transmission processing unit 2211) can also, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), and the like, with respect to data, control information, and the like, acquired from the control unit 210, to generate a bit string to be transmitted.

[0290] The transmission / reception unit 220 (transmission processing unit 2211) can also perform channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, digital-analog conversion, and the like, with respect to the bit string to be transmitted, to output a baseband signal as a transmission processing.

[0291] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. With respect to a certain channel (e.g., PUSCH), in a case where transform precoding is activated (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-described transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and in a case where this is not so, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-described transmission processing.

[0292] The transmission / reception unit 220 (RF unit 222) can also perform modulation to a radio frequency band, filter processing, amplification, and the like, with respect to the baseband signal, to transmit a signal of the radio frequency band via the transmission / reception antenna 230.

[0293] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, and the like with respect to a signal of a radio band received through the transmission / reception antenna 230.

[0294] The transmission / reception unit 220 (reception processing unit 2212) can also acquire user data and the like by applying reception processing such as analog-digital conversion, FFT processing, IDFT processing (as necessary), filter processing, demapping, demodulation, decoding (which can also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing with respect to the acquired baseband signal.

[0295] The transmission / reception unit 220 (measurement unit 223) can also perform measurement related to a received signal. For example, the measurement unit 223 can also perform RRM measurement, CSI measurement, and the like based on a received signal. The measurement unit 223 can also perform measurement with respect to 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 can also be output to the control unit 210.

[0296] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0297] The transmission / reception unit 220 can also receive information (for example, setting / indication, RRC parameter / MAC CE / DCI) indicating a plurality of transmission configuration indication (TCI) states of the same demodulation reference signal (DMRS) port for reception of a physical downlink shared channel (PDSCH). The control unit 210 can also use the plurality of TCI states in reception of a plurality of PDSCHs carrying the same downlink data (first embodiment).

[0298] The control unit 210 can also determine the DMRS port of the PDSCH based on an association (for example, an antenna port index table) of a value of an antenna port field within downlink control information and a DMRS port number (second embodiment).

[0299] One or two TCI states indicated in one code point of a TCI field within the downlink control information can also correspond to all DMRS ports indicated by the association (third embodiment).

[0300] The plurality of PDSCHs can also be transmitted from one or more transmission points configured to a mobile path.

[0301] The transmission / reception unit 220 can also receive information (e.g., configuration / indication, RRC parameter / MAC CE / DCI) indicating a plurality of transmission configuration indication (TCI) states for the same demodulation reference signal (DMRS) port for a physical downlink shared channel (PDSCH). The control unit 210 can also determine, based on the downlink control information, at least one of the TCI states and the resource allocation for each of a plurality of PDSCHs carrying the same downlink data (fourth embodiment, fifth embodiment).

[0302] The control unit 210 can also use a default value for the TCI state in a case where the downlink control information does not include a TCI field or in a case where a time offset between the downlink control information and the plurality of PDSCHs is less than a threshold value (fourth embodiment).

[0303] The transmission / reception unit 220 can also receive a configuration for the PDSCH for one or a plurality of transmission points. The control unit 210 can also determine, based on the configuration and the downlink control information, at least one of the TCI states and the resource allocation (fifth embodiment).

[0304] The plurality of PDSCHs can be transmitted from one or more transmission points configured to the mobile path.

[0305] (Hardware structure)

[0306] In addition, the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are realized by any combination of hardware and software, at least one of them. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block can be realized by one device physically or logically combined, or by a plurality of devices physically or logically separated and connected directly or indirectly (for example, by wire, wireless, or the like). The functional block can also be realized by combining the above one device or the above plurality of devices with software.

[0307] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, choosing, establishing, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method is not particularly limited.

[0308] For example, in one embodiment of this disclosure, the base station, user terminal, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 10 This diagram illustrates an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0309] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0310] For example, only one processor 1001 is shown, but there can be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0311] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 can perform calculations and control communication via the communication device 1004, or control at least one of reading out and writing data in the memory 1002 and the storage device 1003.

[0312] The processor 1001, for example, causes an operating system to operate to control the entire computer. The processor 1001 can also be configured by a central processing device (Central Processing Unit (CPU)) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmission and reception unit 120 (220), and the like described above can also be implemented by the processor 1001.

[0313] Further, the processor 1001 reads out programs (program codes), software modules, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them. As the programs, a program for causing a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be applied to other functional blocks.

[0314] The memory 1002 can also be a computer-readable recording medium such as at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other appropriate storage medium. The memory 1002 can also be referred to as a register, a cache, a main memory (main storage device), and the like. The memory 1002 can hold programs (program codes), software modules, and the like that can be executed in order to implement the wireless communication method related to one embodiment of the present disclosure.

[0315] The storage 1003 can also be a computer-readable recording medium such as at least one of a flexible disc, a Floppy (registered trademark) disc, a magneto-optical disc (such as a Compact Disc (Compact Disc Read Only Memory (CD-ROM) or the like), a Digital Versatile Disc, a Blu-ray (Blu-ray) (registered trademark) disc), a removable magnetic disc, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, other appropriate storage medium. The storage 1003 can also be referred to as an auxiliary storage device.

[0316] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, for example, also referred to as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above can also be implemented by the communication device 1004. The transmission / reception unit 120 (220) can also be implemented by the transmission unit 120a (220a) and the reception unit 120b (220b) to be physically or logically separated.

[0317] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, and the like) that performs output to the outside. In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (for example, a touch panel).

[0318] Further, the processor 1001, the memory 1002, and the like are connected by a bus 1007 for communicating information. The bus 1007 can be configured with a single bus, or can be configured with different buses between the devices.

[0319] Further, the base station 10 and the user terminal 20 can also be configured to include a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like hardware, and a part or all of the functional blocks can be implemented using the hardware. For example, the processor 1001 can also be implemented with at least one of these hardware.

[0320] (Modified example)

[0321] Also, the terms described in the present disclosure and the terms necessary for understanding the present disclosure can be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (a signal or signaling) can be replaced with each other. Also, a signal can be a message. A reference signal (RS) can also be simply referred to as an RS, and can also be referred to as a pilot, a pilot signal, or the like according to the applied standard. Also, a component carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

[0322] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) constituting the radio frame can also be referred to as a subframe. Further, a subframe can also be composed of one or more slots in the time domain. A subframe can also be a fixed length of time (e.g., 1 ms) independent of numerology.

[0323] Here, numerology can also refer to a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, numerology can also represent at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering processing performed by a transmitter-receiver in the frequency domain, a specific windowing processing performed by the transmitter-receiver in the time domain, or the like.

[0324] A slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, or the like) in the time domain. Also, a slot can be a time unit based on numerology.

[0325] A slot can also contain a plurality of mini-slots. Each mini-slot can also be composed of one or more symbols in the time domain. Also, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0326] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the mini-slot, and the symbol can also be referred to as other names.

[0327] For example, one subframe can be referred to as a TTI, a plurality of continuous subframes can be referred to as a TTI, one slot or one mini-slot can be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. In addition, a unit representing a TTI can not be referred to as a subframe, but can be referred to as a slot, a mini-slot, or the like.

[0328] Here, a TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling in which a radio resource (a frequency bandwidth, a transmission power, or the like, which can be used in each user terminal) is allocated to each user terminal in a TTI unit. In addition, the definition of a TTI is not limited thereto.

[0329] A TTI can also be a transmission time unit of a data packet (a transport block), a code block, a codeword, or the like, which has been channel-encoded, and can also become a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (for example, a number of symbols) to which a transport block, a code block, a codeword, or the like is actually mapped can be shorter than the TTI.

[0330] In addition, in a case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (that is, one or more slots or one or more mini-slots) can also become a minimum time unit of scheduling. Furthermore, the number of slots (the number of mini-slots) constituting the minimum time unit of scheduling can also be controlled.

[0331] A TTI having a time length of 1 ms can be referred to as a normal TTI (a TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, or the like. A TTI shorter than the normal TTI can be referred to as a shortened TTI, a short TTI, a partial TTI (or a fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, or the like.

[0332] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be replaced with a TTI having a time length longer than 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be replaced with a TTI having a TTI length shorter than that of the long TTI and a TTI length of 1 ms or more.

[0333] A resource block (RB) is a unit of resource allocation in the time domain and the frequency domain, and can include one or more contiguous subcarriers in the frequency domain. The number of subcarriers included in an RB can be the same regardless of numerologies, for example, 12. The number of subcarriers included in an RB can also be determined based on numerologies.

[0334] In addition, an RB can include one or more symbols in the time domain, and can be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can each be composed of one or more resource blocks.

[0335] In addition, one or more RBs can be referred to as a physical RB (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0336] In addition, an RB can be composed of one or more resource elements (REs). For example, one RE can be a radio resource area of one subcarrier and one symbol.

[0337] A bandwidth part (BWP) (may also be referred to as a partial bandwidth, etc.) can indicate a subset of contiguous common RBs (common resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can be determined by the index of the RBs with reference to a common reference point of the carrier. A PRB can be defined in a certain BWP and additionally numbered within the BWP.

[0338] An UL BWP (BWP for UL) and a DL BWP (BWP for DL) can be included in a BWP. For a UE, one or more BWPs can be configured within one carrier.

[0339] At least one of the set BWP can also be activated, and the UE can not be conceived to transmit and receive a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", and the like in the present disclosure can also be replaced with "BWP".

[0340] In addition, the above-described wireless frame, subframe, slot, mini-slot, and symbol structures are merely examples. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of mini-slots included in a slot, the number of symbols included in a slot or mini-slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, and the like within a TTI can be variously changed.

[0341] Further, the information, parameters, and the like explained in the present disclosure can be expressed by absolute values, can be expressed by relative values with respect to specific values, and can be expressed by corresponding other information. For example, a wireless resource can also be indicated by a specific index.

[0342] In the present disclosure, the names used for parameters and the like are not names in all aspects. Further, mathematical expressions and the like using these parameters can also be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, and the like) and information elements can be identified by any appropriate names, and thus various names assigned to these various channels and information elements are not names in all aspects.

[0343] The information, signals, and the like explained in the present disclosure can be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0344] Further, the information, signals, and the like can be output in at least one of: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. The information, signals, and the like can be input and output via a plurality of network nodes.

[0345] The input and output information, signals, and the like can be saved in a specific location (for example, a memory) and can be managed using a management table. The input and output information, signals, and the like can be overwritten, updated, or added. The output information, signals, and the like can be deleted. The input information, signals, and the like can be transmitted to other devices.

[0346] The notification of the information is not limited to the manners / embodiments explained in the present disclosure, and can be performed in other methods. For example, the notification of the information in the present disclosure can also be performed through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0347] In addition, the physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling can also be referred to as an RRC message, for example, can also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Furthermore, the MAC signaling can also be notified, for example, using a MAC Control Element (CE).

[0348] In addition, the notification of specific information (e.g., the notification of "X is") is not limited to explicit notification, and can also be performed implicitly (e.g., by not performing the notification of the specific information, or by the notification of other information).

[0349] The determination can be performed through a value represented by one bit (0 or 1), can also be performed through a true / false value (Boolean value) represented by true or false, and can also be performed through a comparison of numerical values (e.g., a comparison with a specific value).

[0350] Software, regardless of the term by which it is known, should be broadly interpreted to include instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0351] Also, software, instructions, information, etc. can be transmitted as encoded signals using a transmission medium via a communication link, which facilitates transmitting software. For example, if using wired techniques, transmission media includes wires, coaxial cables, fiber optics, twisted pair cables, digital subscriber line (DSL), etc. If using wireless techniques, transmission media includes radio waves, infrared waves, microwave lines, etc. Transmission media also includes wires, coaxial cables, fiber optics, twisted pair cables, digital subscriber line (DSL), etc. for wired techniques and radio waves, infrared waves, microwave lines, etc. for wireless techniques.

[0352] The terms “system” and “network” used in the present disclosure can be used interchangeably. The “network” can also mean an apparatus (e.g., a base station) included in the network.

[0353] In the present disclosure, the terms “precoding”, “precoder”, “weight (precoding weight)”, “Quasi-Co-Location (QCL)”, “Transmission Configuration Indication state (TCI state)”, “spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, “antenna port”, “antenna port group”, “layer”, “number of layers”, “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel”, etc. can be used interchangeably.

[0354] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. There are also cases where the base station is called with the terms macro cell, small cell, femto cell, pico cell, and the like.

[0355] A base station can accommodate one or multiple (e.g., three) cells. In the case of a base station accommodating multiple cells, the coverage area of the base station as a whole can be divided into multiple smaller areas, each of which can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within the coverage.

[0356] In the present disclosure, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", and the like can be used interchangeably.

[0357] There are also cases where the mobile station is called with the terms subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or a number of other proper terms.

[0358] At least one of the base station and the mobile station can also be referred to as a transmission device, a reception device, a wireless communication device, or the like. In addition, at least one of the base station and the mobile station can also be a device mounted on a mobile body, a mobile body itself, or the like. The mobile body can be a vehicle (for example, a car, an airplane, or the like), can also be a mobile body that moves in a unmanned manner (for example, a drone, an automated driving vehicle, or the like), and can also be a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station can also be a sensor or the like, an Internet of Things (IoT) device.

[0359] Furthermore, the base station in the present disclosure can also be replaced with a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), or the like), each of the modes / embodiments of the present disclosure can also be applied. In this case, a structure in which the user terminal 20 has the functions of the base station 10 described above can also be provided. Furthermore, the terms "uplink", "downlink", and the like can also be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, and the like can also be replaced with a side channel.

[0360] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, a structure in which the base station 10 has the functions of the user terminal 20 described above can also be provided.

[0361] In the present disclosure, operations performed by the base station are sometimes also performed by an upper node thereof depending on the situation. Obviously, in a network including one or a plurality of network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), or the like, but not limited to these), or a combination thereof.

[0362] The modes / embodiments explained in the present disclosure can be used individually, or in combination, and can also be used in switching as the execution proceeds. Further, the processing procedures, sequences, flowcharts, and the like of the modes / embodiments explained in the present disclosure can also be changed in order as long as they do not contradict each other. For example, for the methods explained in the present disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0363] The modes / embodiments explained in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, and the like. Further, a plurality of systems can also be combined (for example, LTE or LTE-A, in combination with 5G, and the like) and applied.

[0364] The expression "based on" used in the present disclosure does not mean "only based on" unless specifically written. In other words, the expression "based on" means both "only based on" and "at least based on".

[0365] Any reference to an element or element means in this disclosure using a designation of "first," "second," and the like, is not intended to mean that only one of each element can be employed in the disclosure and is used only to distinguish between two or more elements from one another. As such, a reference to first and second elements does not mean that there can be only two of each element in the disclosure and / or that the first element must precede the second element in some form.

[0366] The term "determining" as used in this disclosure can encompass a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as looking up in a table, a database or another data structure), ascertaining and the like.

[0367] Also, "determining" can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like.

[0368] Also, "determining" can include resolving, selecting, choosing, establishing and the like.

[0369] Also, "determining" can be construed as "assuming," "expecting," "considering," and the like.

[0370] The term "connected", "coupled", or all variations thereof, as used in the disclosure, is used generically and / or in the broadest context to encompass the two elements connected or coupled to each other by any of the possible intervening elements, as well as to the coupling between or among the connected or coupled elements. The coupling or connection between the elements can be physical or logical, or a combination thereof. For example, "connected" can be replaced with "accessed".

[0371] In the disclosure, in the case of connecting two elements, it can be considered that one or more electric wires, cables, printed electric connections, and the like are used, and as several non-limiting and non-inclusive examples, electromagnetic energy having a wavelength of a radio frequency domain, a microwave region, a light (both visible and non-visible) region, and the like are used to be "connected" or "coupled" to each other.

[0372] In the disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, the term can also mean "A and B are different from C, respectively". The terms "separated", "coupled", and the like can also be interpreted as "different" in the same manner.

[0373] In the disclosure, in the case of using "include", "including", and variations thereof, these terms mean the same as the term "comprising" in the inclusive sense. Further, the term "or" used in the disclosure does not mean the exclusive sense.

[0374] In the disclosure, for example, in the case of adding an article by translation such as a, an, and the in English, the disclosure can also include the case where the noun following the article is plural.

[0375] The above has been described in detail with respect to the invention related to the disclosure, but the invention related to the disclosure is obviously not limited to the embodiments described in the disclosure for those skilled in the art. The invention related to the disclosure can be implemented as a modification and a change without departing from the spirit and scope of the invention determined based on the recitations of the claims. Therefore, the recitations of the disclosure are intended for the purpose of illustrative description, and do not have any limiting meaning on the invention related to the disclosure.

Claims

1. A terminal, comprising: The receiving unit receives information indicating multiple transmit setting indication states, or multiple TCI states, for the same demodulation reference signal port (DMRS port) used for receiving the Physical Downlink Shared Channel (PDSCH); and The control unit, when a PDSCH transmission mode using the multiple TCI states of the same DMRS port for receiving the PDSCH is configured via higher-layer signaling, and such information is received, uses the multiple TCI states for receiving the PDSCH. The setting of the PDSCH transmission mode for the multiple TCI states using the same DMRS port for receiving the PDSCH is set separately from the downlink control channel transmission mode, i.e., the PDCCH transmission mode, which activates multiple TCI states for a control resource set, i.e., CORESET. The control unit reports capability information. The capability information indicates that the terminal supports the multiple TCI states of the same DMRS port used for receiving the PDSCH.

2. The terminal as described in claim 1, wherein, When the time offset between the PDSCH and the downlink control information (DCI) that schedules the PDSCH is greater than a threshold, and the DCI does not contain a TCI field, the control unit uses the TCI state or QCL assumption applied for the control resource set (CORESET) in the reception of the PDSCH. The control resource set is used to transmit the downlink control channel (PDCCH) of the DCI.

3. The terminal as described in claim 1, wherein, The information refers to the first activation command that maps at least one code point of the TCI field for downlink control information (DCI) to two TCI states. Upon receiving the first activation command, the control unit uses the first antenna port table. Upon receiving a second activation command that maps each code point of the TCI field for the DCI to a TCI state, the control unit uses a second antenna port table that is different from the first antenna port table.

4. The terminal as described in claim 1, wherein, The information is an activation command that maps at least one code point of the TCI field of the downlink control information (DCI) to two TCI states. If the time offset between the DCI and the PDSCH is less than a threshold, the control unit will use the TCI state corresponding to the lowest code point among the code points that are mapped to the two TCI states in the activation command for receiving the PDSCH.

5. A wireless communication method for a terminal, comprising: The steps of receiving information indicating multiple transmit setting indication states, or multiple TCI states, for the same demodulation reference signal port (DMRS port) used for receiving the Physical Downlink Shared Channel (PDSCH). The step of using the multiple TCI states in the reception of the PDSCH when the PDSCH transmission mode is configured to use the same DMRS port for receiving the PDSCH via higher-layer signaling, and when the information is received; and The steps for reporting capability information The setting of the PDSCH transmission mode for the multiple TCI states using the same DMRS port for receiving the PDSCH is set separately from the downlink control channel transmission mode, i.e., the PDCCH transmission mode, which activates multiple TCI states for a control resource set, i.e., CORESET. The capability information indicates that the terminal supports the multiple TCI states of the same DMRS port used for receiving the PDSCH.

6. A base station, comprising: The transmitting unit transmits information indicating multiple transmit setting indication states, or multiple TCI states, for the same demodulation reference signal port (DMRS port) used for receiving the Physical Downlink Shared Channel (PDSCH). The control unit, when setting the PDSCH transmission mode using the multiple TCI states of the same DMRS port for receiving the PDSCH via higher-layer signaling, and transmitting the information, uses the multiple TCI states to control the transmission of the PDSCH; and The receiving unit for receiving capability information reports. The control unit sets the PDSCH transmission mode for the multiple TCI states of the same DMRS port used for receiving the PDSCH separately from the downlink control channel transmission mode (PDCCH transmission mode) for multiple TCI states activated for a control resource set (CORESET). The capability information indicates that the terminal supports the multiple TCI states of the same DMRS port used for receiving the PDSCH.

7. A system having a terminal and a base station, wherein, The terminal has: The receiving unit receives information indicating multiple transmit setting indication states, or multiple TCI states, of the same demodulation reference signal port (DMRS port) used for receiving the Physical Downlink Shared Channel (PDSCH). as well as The control unit, when a PDSCH transmission mode using the multiple TCI states of the same DMRS port for receiving the PDSCH is configured via higher-layer signaling, and such information is received, uses the multiple TCI states for receiving the PDSCH. The setting of the PDSCH transmission mode for the multiple TCI states using the same DMRS port for receiving the PDSCH is set separately from the downlink control channel transmission mode, i.e., the PDCCH transmission mode, which activates multiple TCI states for a control resource set, i.e., CORESET. The control unit reports capability information. The capability information indicates that the terminal supports the multiple TCI states of the same DMRS port used for receiving the PDSCH. The base station has: The sending unit sends the information.

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