Terminal, wireless communication method, and system

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit which receives downlink control information (DCI) that schedules a physical downlink shared channel (PDSCH); and a control unit which, on the basis of the presence, in the DCI, of a field indicating a transmission configuration instruction (TCI) state of the PDSCH, determines whether the PDSCH is a PDSCH from a single transmission and reception point, a PDSCH using a single frequency network (SFN), or a repeated transmission of a PDSCH, and determines a TCI state used for receiving the PDSCH. According to one aspect of the present disclosure, downlink signals can be suitably received from a plurality of transmission points.

Description

Technical Field

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

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was standardized for the purpose of further high data rates, low latency, etc. (Non-Patent Document 1). Also, for the purpose of further large capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was standardized.

[0003] Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being considered.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a future wireless communication system (e.g., NR), in order to realize wireless communication in a moving body moving at high speed (e.g., a train, etc.), it is assumed to use a beam transmitted from a transmission point (e.g., Remote Radio Head (RRH)) arranged on the path of the moving body.

[0006] However, there has been insufficient consideration of how a terminal receives a downlink signal transmitted from a plurality of transmission points. If such an operation is not clear, there is a risk of causing a decrease in throughput or the like.

[0007] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and System that can appropriately receive downlink signals from a plurality of transmission points.

Means for Solving the Problems

[0008] A terminal according to an aspect of the present disclosure includes a receiving unit that receives downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), when the offset between the reception of the DCI and the PDSCH is equal to or greater than a specific threshold, and a field in the DCI that indicates a transmission configuration indication (TCI) state of the PDSCH is presence when not, when the DCI corresponds to a physical downlink control channel (PDCCH) of a single transmission and reception point (TRP), the PDSCH is the single TRP from the PDSCH is , when the DCI a control unit that determines whether to use a physical downlink shared channel (PDSCH) of a single frequency network (SFN). C CH corresponds to, the PDSCH is a PDSCH that uses the SFN It has.

Effects of the Invention

[0009] According to an aspect of the present disclosure, a downlink signal from a plurality of transmission points can be appropriately received.

Brief Description of the Drawings

[0010]

Figure 1

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Figure 9

[0011] (TCI, Spatial Relationship, QCL) In NR, based on the Transmission Configuration Indication state (TCI state), it is considered to control at least one of the reception processing (e.g., at least one of reception, demapping, demodulation, decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, encoding) of at least one of a signal and a channel (expressed as a signal / channel) in a UE.

[0012] The TCI state may represent what is applied to the downlink signal / channel. What corresponds to the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information regarding the Quasi-Co-Location (QCL) of a signal / channel, and may be referred to as a spatial reception parameter, Spatial Relation Information, etc. The TCI state may be set for the UE for each channel or for each signal.

[0014] QCL is an indicator showing the statistical properties of a signal / channel. For example, when a certain signal / channel and another signal / channel are in a QCL relationship, it may mean that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same (QCL with respect to at least one of these) among these different multiple signals / channels.

[0015] Note that the spatial reception parameter may correspond to the reception beam of the UE (e.g., reception analog beam), and the beam may be specified based on spatial QCL. QCL (or at least one element of QCL) in the present disclosure may be read as sQCL (spatial QCL).

[0016] Multiple types (QCL types) of QCL may be defined. For example, four QCL types A - D may be provided where the parameters (or parameter sets) that can be assumed to be the same are different, and the parameters (which may also be referred to as QCL parameters) are shown below: · QCL type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread, · QCL type B (QCL-B): Doppler shift and Doppler spread, · QCL type C (QCL-C): Doppler shift and average delay, · QCL type D (QCL-D): Spatial reception parameters.

[0017] It may be called a QCL assumption that a UE assumes that a certain control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a relationship with another CORESET, channel, or reference signal and a specific QCL (for example, QCL type D).

[0018] The UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0019] The TCI state may be, for example, information regarding the QCL between a target channel (in other words, a reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0020] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)).

[0021] The channel for which the TCI state or spatial relation is set (specified) may be, for example, 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)).

[0022] Also, the RS having a QCL relation with the channel may be, for example, at least one of a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also called Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also called QRS).

[0023] The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a physical broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may be called an SS / PBCH block.

[0024] The RS of QCL type X in the TCI state may mean an RS having a relation of QCL type X with a certain channel / signal (DMRS of the channel / signal), and this RS may also be called the QCL source of QCL type X in the TCI state.

[0025] (Default TCI state / Default spatial relation / Default PL-RS) In Rel.16, the PDSCH may be scheduled by DCI having a TCI field. The TCI state for the PDSCH is indicated by the TCI field. The TCI field of DCI format 1-1 is 3 bits, and the TCI field of DCI format 1-2 is at most 3 bits.

[0026] In RRC connected mode, if the first DCI internal TCI information (higher layer parameter tci-PresentInDCI) for the CORESET that schedules the PDSCH is set to "enabled", the UE shall assume that there is a TCI field in DCI format 1_1 of the PDCCH transmitted in the CORESET.

[0027] Also, if the second DCI internal TCI information (higher layer parameter tci-PresentInDCI-1-2) for the CORESET that schedules the PDSCH is configured for the UE, the UE shall assume that there is a TCI field with the DCI field size indicated by the second DCI internal TCI information in DCI format 1_2 of the PDSCH transmitted in the CORESET.

[0028] Also, in Rel.16, the PDSCH may be scheduled by DCI without a TCI field. The DCI format of the said DCI may be DCI format 1_0, or DCI format 1_1 / 1_2 in a case where the TCI information in the DCI (higher layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled). If the PDSCH is scheduled by DCI without a TCI field and the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH (scheduling DCI)) and the corresponding PDSCH (the PDSCH scheduled by the said DCI) is greater than or equal to the threshold value (timeDurationForQCL), the UE shall assume that the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption of the CORESET (e.g., the scheduling DCI).

[0029] In RRC connected mode, in both cases where the TCI information in the DCI (higher layer parameters tci-PresentInDCI and tci-PresentInDCI-1-2) is set to "enabled" and where the TCI information in the DCI is not set, if the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the said DCI) is less than the threshold value (timeDurationForQCL) (application condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest CORESET ID in the latest slot within the active DL BWP of the CC of that (specific UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest TCI state ID of the PDSCH within the active DL BWP of the scheduled CC.

[0030] In Rel.15, individual MAC CEs for activation / deactivation of PUCCH spatial relation and for activation / deactivation of SRS spatial relation are required. The PUSCH spatial relation follows the SRS spatial relation.

[0031] In Rel.16, at least one of the MAC CE for activation / deactivation of PUCCH spatial relation and the MAC CE for activation / deactivation of SRS spatial relation may not be used.

[0032] If in FR2, neither the spatial relation for PUCCH nor the PL-RS is configured (application condition, second condition), the default assumptions for the spatial relation and PL-RS for PUCCH (default spatial relation and default PL-RS) are applied. If in FR2, neither the spatial relation for SRS (SRS resource for SRS, or SRS resource corresponding to the SRI in DCI format 0_1 that schedules PUSCH) nor the PL-RS is configured (application condition, second condition), the default assumptions for the spatial relation and PL-RS for the PUSCH and SRS scheduled by DCI format 0_1 (default spatial relation and default PL-RS) are applied.

[0033] If a CORESET is configured within the active DL BWP on that CC (application condition), the default spatial relation and default PL-RS may be the TCI state or QCL assumption of the CORESET having the lowest CORESET ID within the active DL BWP. If no CORESET is configured within the active DL BWP on that CC, the default spatial relation and default PL-RS may be the active TCI state having the lowest ID of the PDSCH within the active DL BWP.

[0034] In Rel.15, the spatial relation of the PUSCH scheduled by DCI format 0_0 follows the spatial relation of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relations of the PUCCH on the same CC. Even when PUCCH is not transmitted on an SCell, the network needs to update the PUCCH spatial relations on all SCells.

[0035] In Rel.16, PUCCH configuration for the PUSCH scheduled by DCI format 0_0 is not required. For the PUSCH scheduled by DCI format 0_0, when there is no active PUCCH spatial relation or no PUCCH resource on the active UL BWP within its CC (application condition, second condition), the default spatial relation and default PL-RS are applied to the PUSCH.

[0036] The application conditions for the default spatial relation / default PL-RS for SRS may include that the default beam path loss activation information element for SRS (higher layer parameter enableDefaultBeamPlForSRS) is set to be effective. The application conditions for the default spatial relation / default PL-RS for PUCCH may include that the default beam path loss activation information element for PUCCH (higher layer parameter enableDefaultBeamPlForPUCCH) is set to be effective. The application conditions for the default spatial relation / default PL-RS for the PUSCH scheduled by DCI format 0_0 may include that the default beam path loss activation information element for the PUSCH scheduled by DCI format 0_0 (higher layer parameter enableDefaultBeamPlForPUSCH0_0) is set to be effective.

[0037] The above threshold may be referred to as the time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", schedule offset threshold, scheduling offset threshold, etc.

[0038] It is assumed that when the offset between the reception of a DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one TCI state set for the serving cell of the scheduled PDSCH includes "QCL type D", and the UE has the 2 default TCI activation parameter (enableTwoDefaultTCIStates-r16) set, and at least one TCI code point indicates two TCI states, the DMRS ports of the PDSCH or PDSCH transmission occasion of the serving cell are quasi co-located with the RS related to the QCL parameters of the two TCI states corresponding to the lowest code point among the two different TCI states included in the TCI code point. The 2 default TCI activation parameter indicates that the Rel.16 operation of the two default TCI states for the PDSCH is enabled when at least one TCI code point is mapped to two TCI states.

[0039] (Multi-TRP) In NR, it is being considered that one or more Transmission / Reception Points (TRPs) (multi-TRP (MTRP)) perform DL transmission to the UE using one or more panels (multi-panel). Also, it is being considered that the UE performs UL transmission to one or more TRPs using one or more panels.

[0040] Note that multiple TRPs may correspond to the same cell identifier (cell Identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0041] Multi-TRPs (e.g., TRP#1, #2) are connected by ideal / non-ideal backhaul, and information, data, etc. may be exchanged. Different codewords (Code Word (CW)) and different layers may be transmitted from each TRP of the multi-TRP. As a form of multi-TRP transmission, Non-Coherent Joint Transmission (NCJT) may be used.

[0042] In NCJT, for example, TRP#1 modulates and maps the first codeword, layer-maps it, and transmits the first PDSCH with the first number of layers (e.g., 2 layers) using the first precoding. Also, TRP#2 modulates and maps the second codeword, layer-maps it, and transmits the second PDSCH with the second number of layers (e.g., 2 layers) using the second precoding.

[0043] Note that multiple PDSCHs (multi-PDSCHs) subject to NCJT may be defined to partially or completely overlap in at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap in at least one of the time and frequency resources.

[0044] These first PDSCH and second PDSCH may be assumed to be not quasi-co-located. The reception of the multi-PDSCH may be reinterpreted as the simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0045] Multiple PDSCHs from multiple TRPs (which may also be referred to as multiple PDSCH) may be scheduled using one DCI (single DCI, single PDCCH) (single master mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs may be scheduled respectively using multiple DCIs (multiple DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP).

[0046] In Ultra-Reliable and Low Latency Communications (URLLC) for multi-TRP, it is being considered to support repetition of Physical Downlink Shared Channel (PDSCH) (transport block (TB) or codeword (CW)) across multiple TRPs. Repetition schemes (URLLC scheme, reliability enhancement scheme, e.g., scheme 1a, 2a, 2b, 3, 4) across multiple TRPs in the frequency domain or layer (spatial) domain or time domain are being considered. In scheme 1a, multi-PDSCH from multiple TRPs is space division multiplexing (SDM). In schemes 2a and 2b, PDSCH from multiple TRPs is frequency division multiplexing (FDM). In scheme 2a, the redundancy version (RV) for multiple TRPs is the same. In scheme 2b, the RV for multiple TRPs may be the same or different. In schemes 3 and 4, multi-PDSCH from multiple TRPs is time division multiplexing (TDM). In scheme 3, multi-PDSCH from multiple TRPs is transmitted within one slot. In scheme 4, multi-PDSCH from multiple TRPs is transmitted in different slots.

[0047] According to such a multi-TRP scenario, more flexible transmission control using a good-quality channel is possible.

[0048] In order to support multi-TRP transmission within a cell (intra-cell, having the same cell ID) and between cells (inter-cell, having different cell IDs) based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCH and PDSCH having multiple TRPs, one control resource set (CORESET) within the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0049] If at least one of the following Conditions 1 and 2 is satisfied, the UE may determine that it is a multi-TRP based on multi-DCI. In this case, the TRP may be re-mapped to the CORESET pool index. [Condition 1] One CORESET pool index is configured. [Condition 2] Two different values (for example, 0 and 1) of the CORESET pool index are configured.

[0050] If the following condition is satisfied, the UE may determine that it is a multi-TRP based on single-DCI. In this case, the two TRPs may be re-mapped to two TCI states indicated by MAC CE / DCI. [Condition] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one code point of the TCI field in DCI.

[0051] The common beam indication DCI may be a UE-specific DCI format (for example, DL DCI format (for example, 1_1, 1_2), UL DCI format (for example, 0_1, 0_2)), or a UE-group common DCI format.

[0052] (SFN PDCCH) For the PDCCH / CORESET defined in Rel.15, one TCI state without a CORESET pool index (which may be called TRP information (TRP Info)) is set for one CORESET.

[0053] For the enhancement of PDCCH / CORESET defined in Rel.16, in the multi-TRP based on multi-DCI, a CORESET pool index is set for each CORESET.

[0054] After Rel.17, the following enhancements 1 and 2 for PDCCH / CORESET are under consideration.

[0055] In the case where multiple antennas (small antennas, transmission and reception points) with the same cell ID form a single frequency network (SFN), for one CORESET, up to two TCI states can be set / activated by upper layer signaling (RRC signaling / MAC CE) (Enhancement 1). The SFN contributes to at least one of the operation and reliability improvement of high speed trains (HST).

[0056] Also, in the repeated transmission of PDCCH (which may simply be called "repetition"), two PDCCH candidates in two search space sets are linked, and each search space set is associated with the corresponding CORESET (Enhancement 2). The two search space sets may be associated with the same or different CORESETs. For one CORESET, one (up to one) TCI state can be set / activated by upper layer signaling (RRC signaling / MAC CE).

[0057] If two search space sets are associated with different CORESETs having different TCI states, it may mean repeated transmission of multi-TRP. If two search space sets are associated with the same CORESET (CORESET with the same TCI state), it may mean repeated transmission of single-TRP.

[0058] (HST) In LTE, it is difficult to arrange in the tunnel of an HST (high speed train). The large antenna performs transmission outside / inside the tunnel. For example, the transmission power of the large antenna is about 1 to 5 W. For handover, it is important for the UE to transmit outside the tunnel before entering the tunnel. For example, the transmission power of the small antenna is about 250 mW. A plurality of small antennas (transmission and reception points) having the same cell ID and a distance of 300 m form a single frequency network (SFN). All small antennas in the SFN transmit the same signal at the same time on the same PRB. It is assumed that the terminal communicates with one base station. In fact, a plurality of transmission and reception points transmit the same DL signal. When moving at high speed, the transmission and reception points in the unit of several kilometers form one cell. Handover is performed when crossing cells. Thereby, the handover frequency can be reduced.

[0059] In NR, in order to communicate with a terminal (hereinafter also referred to as UE) included in a moving body such as a train moving at high speed (HST (high speed train)), it is assumed to use a beam transmitted from a transmission point (for example, RRH). In an existing system (for example, Rel.15), it is supported to transmit a unidirectional beam from the RRH to communicate with the moving body (see FIG. 1A).

[0060] In Fig. 1A, an example is shown where RRHs are installed along the moving path (or moving direction, traveling direction, driving route) of a moving body, and beams are formed from each RRH toward the advancing direction side of the moving body. The RRH that forms a beam in one direction may be called a uni-directional RRH. In the example shown in Fig. 1A, the moving body receives a negative Doppler shift (-f D ) from each RRH.

[0061] Note that here, an example is shown where a beam is formed toward the advancing direction side of the moving body, but it is not limited to this, and a beam may be formed on the side opposite to the advancing direction, or a beam may be formed in any direction regardless of the advancing direction of the moving body.

[0062] After Rel. 16, it is also assumed that multiple (for example, two or more) beams are transmitted from the RRH. For example, it is assumed that beams are formed for both the advancing direction of the moving body and the opposite direction (see Fig. 1B).

[0063] In Fig. 1B, an example is shown where RRHs are installed along the moving path of the moving body, and beams are formed from each RRH toward both the advancing direction side and the opposite side of the advancing direction of the moving body. The RRH that forms beams in multiple directions (for example, two directions) may be called a bi-directional RRH.

[0064] In HST, the UE communicates in the same way as a single TRP. In base station implementation, it can be transmitted from multiple TRPs (with the same cell ID).

[0065] In the example of Fig. 1B, when two RRHs (here, RRH#1 and RRH#2) use SFN, when the moving body is in the middle of the two RRHs, the signal received with a negative Doppler shift switches to a signal received with a positive Doppler shift where the power increases. In this case, the maximum change range of the Doppler shift that requires correction is from -f D to +f DThis results in a change to twice that of the case of the unidirectional RRH.

[0066] Here, as a scheme for HST, the following Schemes 0 to 2 (HST Scheme 0 to HST Scheme 2) are compared.

[0067] In Scheme 0 of FIG. 2A, the tracking reference signal (TRS), DMRS, and PDSCH are transmitted commonly (using the same time and frequency resources) to two TRPs (RRHs) (normal SFN, transparent SFN, HST - SFN).

[0068] In Scheme 0, since the UE receives the DL channel / signal equivalent to a single TRP, the TCI state of the PDSCH is one.

[0069] Note that in Rel.16, an RRC parameter for distinguishing between transmission using a single TRP and transmission using an SFN is defined. When the UE reports the corresponding UE capability information, based on the RRC parameter, the UE may distinguish between receiving the DL channel / signal of a single TRP and receiving the PDSCH assuming an SFN. On the other hand, the UE may perform transmission and reception using an SFN assuming a single TRP.

[0070] In Scheme 1 of FIG. 2B, the TRS is transmitted uniquely to each TRP (using different time / frequency resources for each TRP). In this example, TRS1 is transmitted from TRP#1 and TRS2 is transmitted from TRP#2.

[0071] In Scheme 1, since the UE receives the DL channel / signal from each TRP using the TRS from each TRP, the TCI state of the PDSCH is two.

[0072] In Scheme 2 of FIG. 2C, the TRS and DMRS are transmitted specifically for the TRP. In this example, TRS1 and DMRS1 are transmitted from TRP#1, and TRS2 and DMRS2 are transmitted from TRP#2. Compared with Scheme 0, Schemes 1 and 2 can suppress the sudden change of the Doppler shift and appropriately estimate / guarantee the Doppler shift. Since the DMRS of Scheme 2 increases compared with the DMRS of Scheme 1, the maximum throughput of Scheme 2 is lower than that of Scheme 1.

[0073] In Scheme 0, the UE switches between a single TRP and the SFN based on upper layer signaling (RRC information element / MAC CE).

[0074] The UE may switch between Scheme 1 / Scheme 2 / NW pre-compensation scheme based on upper layer signaling (RRC information element / MAC CE).

[0075] In Scheme 1, two TRS resources are respectively set for the forward direction and the reverse direction of the HST.

[0076] In the example of FIG. 3A, the TRPs (TRP#0, #2, …) that transmit DL signals in the reverse direction of the HST transmit the first TRS (the TRS arriving from before the HST) in the same time and frequency resources (SFN). The TRPs (TRP#1, #3, …) that transmit DL signals in the forward direction of the HST transmit the second TRS (the TRS arriving from after the HST) in the same time and frequency resources (SFN). The first TRS and the second TRS may be transmitted / received using different frequency resources.

[0077] In the example of FIG. 3B, TRS1-1 to 1-4 are transmitted as the first TRS, and TRS2-1 to 2-4 are transmitted as the second TRS.

[0078] Considering beam operation, the first TRS is transmitted using 64 beams and 64 time resources, and the second TRS is transmitted using 64 beams and 64 time resources. The beams of the first TRS and the beams of the second TRS are considered to be equal (the QCL type D RSs are equal). By multiplexing the first TRS and the second TRS on the same time resources and different frequency resources, the resource utilization efficiency can be improved.

[0079] In the example of FIG. 4A, along the movement path of the HST, RRHs #0-#7 are arranged. RRHs #0-#3 and RRHs #4-#7 are respectively connected to baseband units (BBUs) #0 and #1. Each RRH is a bidirectional RRH, and forms a beam using each transmission / reception point (TRP) in both the forward direction and the reverse direction of the movement path.

[0080] In the received signal of the example of FIG. 4B (single TRP (SFN) / scheme 1), when the UE receives a signal / channel transmitted from TRP #2n-1 (n is an integer greater than or equal to 0) (the beam in the forward direction of the HST, the beam from behind the UE), a negative Doppler shift (in this example, -fD) occurs. Also, when the UE receives a signal / channel transmitted from TRP #2n (n is an integer greater than or equal to 0) (the beam in the reverse direction of the forward direction of the HST, the beam from in front of the UE), a positive Doppler shift (in this example, +fD) occurs.

[0081] Since Rel. 17, in the transmission of downlink (DL) signals / channels to the UE in the HST from the TRP, it has been considered to perform Doppler shift correction (which may be called Doppler Compensation, Pre-Doppler Compensation, network (NW) pre-compensation scheme, HST NW pre-compensation scheme). When the TRP transmits DL signals / channels to the UE, by performing Doppler correction in advance, it becomes possible to reduce the influence of Doppler shift at the time of receiving DL signals / channels in the UE. In the present disclosure, the NW pre-compensation scheme may be a combination of Scheme 1 and pre-compensation of Doppler shift by the base station.

[0082] In the NW pre-compensation scheme, the TRP that forms a beam on the traveling direction side of the moving path and the TRP that forms a beam on the side opposite to the traveling direction of the moving path perform Doppler correction and then transmit DL signals / channels to the UE within the HST. In this example, TRP#2n - 1 performs positive Doppler correction, and TRP#2n performs negative Doppler correction to reduce the influence of Doppler shift at the time of receiving the UE's signals / channels (Fig. 4C).

[0083] Note that in the situation of Fig. 4C, since the UE receives DL channels / signals from each TRP using the TRS from each TRP, the number of TCI states of the PDSCH may be two.

[0084] Furthermore, since Release 17, it has been considered to dynamically switch between single TRP and SFN using the TCI field (TCI state field). For example, using RRC information element / MAC CE (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) / DCI (TCI field), one or two TCI states are set / indicated at each TCI code point (code point of the TCI field, DCI code point). When the UE is set / indicated with one TCI state, it may determine that it receives the PDSCH of a single TRP. Also, when the UE is set / indicated with two TCI states, it may determine that it receives the PDSCH of an SFN using multiple TRPs.

[0085] (Analysis) The PDCCH that schedules the PDSCH using SFN (e.g., the above-mentioned scheme 1) may be the PDCCH described in the following assumptions 1 to 3: Assumption 1: The PDCCH defined up to Release 15 (e.g., the PDCCH using a single TRP). Assumption 2: The PDCCH defined since Release 17 (e.g., the PDCCH using SFN). Assumption 3: The PDCCH defined since Release 17 (e.g., PDCCH repetition).

[0086] For at least one of the settings from the above assumptions 1 to 3, the UE may be predefined in the specification, set by upper layer signaling, or reported as UE capability information.

[0087] As described above, for the PDCCH that schedules the SFN PDSCH, when the DCI in the PDCCH has a TCI field, it is possible to instruct the UE, for example, to indicate a single-TRP PDSCH or an SFN PDSCH with the TCI field. However, for example, the method of indicating a single-TRP or an SFN in other cases has not been sufficiently studied. If this study is insufficient, the UE may not be able to appropriately determine a single-TRP or an SFN, which may lead to deterioration of communication performance such as a decrease in throughput.

[0088] Therefore, the inventors have conceived a method for indicating a single-TRP and an SFN.

[0089] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied alone or in combination.

[0090] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read interchangeably. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read interchangeably. In the present disclosure, index, ID, indicator, resource ID may be read interchangeably. In the present disclosure, sequence, list, set, group, cluster, subset, etc. may be read interchangeably. In the present disclosure, support, control, be able to control, operate, be able to operate may be read interchangeably.

[0091] In the present disclosure, configure, activate, update, indicate, enable, specify, select may be read interchangeably.

[0092] In the present disclosure, the upper layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, upper layer, upper layer parameters, RRC information element (IE), RRC message, configuration may be read interchangeably with each other.

[0093] MAC signaling may use, for example, MAC control element (MAC Control Element (MAC CE)), MAC Protocol Data Unit (PDU), etc. In the present disclosure, MAC CE, update command, activation / deactivation command may be read interchangeably with each other.

[0094] The broadcast information may be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), SIB1, Other System Information (OSI), etc.

[0095] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relation, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS may be read as each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read as each other.

[0096] In the present disclosure, panel, Uplink (UL) transmission entity, TRP, spatial relation, Control Resource Set (CORESET), PDSCH, codeword, base station, antenna port of a signal (for example, Demodulation Reference Signal (DMRS) port), antenna port group of a signal (for example, DMRS port group), group for multiplexing (for example, Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (multi-input muti-output (MIMO) layer, transmission layer, spatial layer) may be read as each other. Also, panel Identifier (ID) and panel may be read as each other. In the present disclosure, TRP ID and TRP may be read as each other.

[0097] The panel may be related to at least one of the group index of the SSB / CSI-RS group, the group index of the group-based beam report, and the group index of the SSB / CSI-RS group for the group-based beam report.

[0098] Also, the panel Identifier (ID) and the panel may be interchangeable with each other. That is, the TRP ID and the TRP, the CORESET group ID and the CORESET group, etc. may be interchangeable with each other.

[0099] In the present disclosure, one of the two TCI states associated with one code point of a TRP, a transmission point, a panel, a DMRS port group, a CORESET pool, and a TCI field may be interchangeable with each other.

[0100] In the present disclosure, a single PDCCH (DCI) may be assumed to be supported when multi-TRP uses an ideal backhaul. A multi-PDCCH (DCI) may be assumed to be supported when non-ideal backhaul is used between multi-TRP.

[0101] Note that the ideal backhaul may be called, for example, DMRS port group type 1, reference signal related group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may be called, for example, DMRS port group type 2, reference signal related group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0102] In the present disclosure, single TRP, single TRP system, single TRP transmission, single PDSCH, may be read interchangeably with each other. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, multi-PDSCH, may be read interchangeably with each other. In the present disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, activation of two TCI states on at least one TCI code point, may be read interchangeably with each other.

[0103] In the present disclosure, single TRP, a channel using single TRP, a channel using one TCI state / spatial relation, non-activation of multi-TRP by RRC / DCI, non-activation of multiple TCI states / spatial relations by RRC / DCI, not setting a single CORESET pool index (CORESETPoolIndex) value for any CORESET, and not mapping any code point of the TCI field to two TCI states, may be read interchangeably with each other.

[0104] In the present disclosure, multi-TRP, a channel using multi-TRP, a channel using multiple TCI states / spatial relations, activation of multi-TRP by RRC / DCI, activation of multiple TCI states / spatial relations by RRC / DCI, at least one of multi-TRP based on single DCI and multi-TRP based on multi-DCI, may be read interchangeably with each other. In the present disclosure, multi-TRP based on multi-DCI, setting a single CORESET pool index (CORESETPoolIndex) value for CORESET, may be read interchangeably with each other. In the present disclosure, multi-TRP based on single DCI, mapping at least one code point of the TCI field to two TCI states, may be read interchangeably with each other.

[0105] In the present disclosure, TRP#1 (the first TRP) may correspond to a CORESET pool index = 0, or may correspond to the first TCI state among two TCI states corresponding to one code point of the TCI field. TRP#2 (the second TRP) and TRP#1 (the first TRP) may correspond to a CORESET pool index = 1, or may correspond to the second TCI state among two TCI states corresponding to one code point of the TCI field.

[0106] In the present disclosure, single DCI (sDCI), single PDCCH, a multi-TRP system based on single DCI, sDCI-based MTRP, and activation of two TCI states on at least one TCI code point may be mutually interchangeable.

[0107] In the present disclosure, multi DCI (mDCI), multi PDCCH, a multi-TRP system based on multi DCI, mDCI-based MTRP, and setting of two CORESET pool indexes or CORESET pool index = 1 (or one or more values) may be mutually interchangeable.

[0108] The QCL in the present disclosure may be mutually interchangeable with QCL type D.

[0109] In the present disclosure, statements such as "TCI state A has the same QCL type D as TCI state B", "TCI state A is the same as TCI state B", and "TCI state A has QCL type D as TCI state B" may be mutually interchangeable.

[0110] In the present disclosure, DMRS, DMRS ports, and antenna ports may be mutually interchangeable.

[0111] In the present disclosure, CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, CSI-RS for tracking, CSI-RS having TRS information (higher layer parameter trs-Info), NZP CSI-RS resources within an NZP CSI-RS resource set having TRS information, NZP-CSI-RS resources within an NZP-CSI-RS resource set consisting of a plurality of NZP-CSI-RS resources of the same antenna port, and TRS resources may be read interchangeably with each other. In the present disclosure, CSI-RS resources, CSI-RS resource sets, CSI-RS resource groups, and information elements (IEs) may be read interchangeably with each other.

[0112] In the present disclosure, the code points of the DCI field 'Transmission Configuration Indication', TCI code points, DCI code points, and code points of the TCI field may be read interchangeably with each other.

[0113] In the present disclosure, single TRP and SFN may be read interchangeably with each other. In the present disclosure, HST, HST scheme, high-speed movement scheme, scheme 1, scheme 2, NW pre-compensation scheme, HST scheme 1, HST scheme 2, and HST NW pre-compensation scheme may be read interchangeably with each other.

[0114] In the present disclosure, PDSCH / PDCCH using a single TRP may be read as PDSCH / PDCCH based on a single TRP, single TRP PDSCH / PDCCH. Also, in the present disclosure, PDSCH / PDCCH using SFN may be read as PDSCH / PDCCH using SFN in multi, PDSCH / PDCCH based on SFN, SFN PDSCH / PDCCH.

[0115] In the present disclosure, receiving a DL signal (PDSCH / PDCCH) using SFN may mean receiving the same time / frequency resource and / or the same data (PDSCH) / control information (PDCCH) from multiple transceiver points. Also, receiving a DL signal using SFN may mean receiving the same time / frequency resource and / or the same data / control information using multiple TCI states / spatial domain filters / beams / QCLs.

[0116] (Wireless communication method) When the PDSCH is scheduled by DCI having a TCI field, the NW (e.g., base station) may indicate a single TRP PDSCH or SFN PDSCH in the TCI field. When the PDSCH is scheduled by DCI having a TCI field, the UE may determine a single TRP PDSCH or SFN PDSCH based at least on the TCI field.

[0117] Also, when the PDSCH is scheduled by DCI having a TCI field, the NW may indicate a single TRP PDSCH, SFN PDSCH, or repeated transmission of the PDSCH in the TCI field. When the PDSCH is scheduled by DCI having a TCI field, the UE may determine a single TRP PDSCH, SFN PDSCH, or repeated transmission of the PDSCH based at least on the TCI field.

[0118] The TCI field included in the DCI format may have a specific bit length. For example, the TCI field included in DCI format 1_1 may be 3 bits. Also, for example, the TCI field included in DCI format 1_2 may be at most 3 bits (i.e., from 0 to 3 bits). The bit length of the TCI field included in DCI format 1_2 may be set based on RRC signaling.

[0119] <First Embodiment> The first embodiment may be applied in at least one of the following cases: when the PDSCH is scheduled by DCI without a TCI field, and when the scheduling offset is greater than or equal to a threshold (timeDurationForQCL).

[0120] The DCI format of the DCI without a TCI field may be DCI format 1_0, or DCI format 1_1 / 1_2 in a case where DCI internal TCI information (for example, the upper layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled).

[0121] 《Embodiment 1-1》 The TCI state or QCL assumption of the PDSCH may be the same as the TCI state or QCL assumption of a specific CORESET. The UE may assume / judge that the TCI state or QCL assumption of the PDSCH is the same as the TCI state or QCL assumption of a specific CORESET. The specific CORESET may be the CORESET of the DCI (scheduling DCI) that schedules the PDSCH.

[0122] When the CORESET / scheduling DCI corresponds to the PDCCH of a single TRP, the UE may determine that the scheduled PDSCH is a single TRP PDSCH.

[0123] When the CORESET / scheduling DCI corresponds to the SFN PDCCH, the UE may determine that the scheduled PDSCH is an SFN PDSCH. At this time, one or more (for example, two) TCI states set in the CORESET / search space / DCI / PDCCH may be used / applied to the SFN PDSCH.

[0124] In the present disclosure, the SFN PDSCH may be at least one of the PDSCH of a normal (in scheme 0) SFN, the PDSCH in scheme 1 / 2, and the PDSCH in the NW pre-compensation scheme. Further, the SFN PDSCH of the present disclosure may be limited to the PDSCH in scheme 1 / 2 or the PDSCH in the NW pre-compensation scheme. It may be notified / set by upper layer signaling to the UE whether the SFN PDSCH is at least one of the PDSCH of a normal (in scheme 0) SFN, the PDSCH in scheme 1 / 2, and the PDSCH in the NW pre-compensation scheme.

[0125] In the NW pre-compensation scheme, the UE notified of the TCI state may assume that the received signal is frequency-compensated in PDSCH reception.

[0126] In the present disclosure, when one TCI state is set / indicated, the UE may be assumed to operate according to a single TRP / normal SFN and receive non-frequency-compensated PDSCH / DMRS (Fig. 5A) (it is not necessary to assume receiving frequency-compensated PDSCH / DMRS).

[0127] In the present disclosure, when two TCI states are set / indicated, the UE may be assumed to operate according to scheme 1 / NW pre-compensation scheme and receive frequency-compensated PDSCH / DMRS (Fig. 5B).

[0128] When the CORESET / scheduling DCI corresponds to the repeated transmission of the PDCCH, the UE may determine that the scheduled PDSCH is the SFN PDSCH. At this time, the TCI state used for one or more (for example, two) search space sets (linked search space sets) associated with one or more (for example, two) CORESETs may be used / applied to the SFN PDSCH.

[0129] Also, when the CORESET / scheduling DCI supports repeated transmission of the PDCCH, the UE may determine that the scheduled PDSCH is a repeated transmission of the PDSCH. At this time, for the repeated transmission of the PDSCH, the TCI states used for one or more (e.g., two) search space sets (linked search space sets) associated with one or more (e.g., two) CORESETs may be used / applied.

[0130] 《Embodiment 1-2》 The TCI state or QCL assumption of the PDSCH may correspond to one TCI state (single TRP) (it may be one TCI state). The UE may assume / determine that the TCI state or QCL assumption of the PDSCH corresponds to one TCI state. At this time, the UE may assume a single TRP.

[0131] Note that in the present disclosure, the PDSCH corresponding to one TCI state may be at least one of the PDSCH of a normal SFN and the PDSCH of a single TRP. For the UE, the setting / indication / switching / activation of the PDSCH of a normal SFN and the PDSCH of a single TRP may be performed using specific RRC parameters (e.g., RRC parameters related to the High speed flag).

[0132] The UE does not have to assume / expect that the SFN PDSCH or the SFN PDSCH scheduled by repeated transmission of the PDCCH will be scheduled.

[0133] When the UE is scheduled to receive the SFN PDSCH or the SFN PDSCH by repeated transmission of the PDCCH, the UE may select / determine one TCI state from one or more (e.g., two) TCI states corresponding to the CORESET.

[0134] Regarding PDCCH repeated transmission, the one TCI state to be selected / decided may be a TCI state corresponding to a specific CORESET ID / search space ID / TCI state ID. The specific CORESET ID / search space ID / TCI state ID may be the minimum (or maximum) CORESET ID / search space ID / TCI state ID. Also, the specific CORESET ID / search space ID / TCI state ID may be the Nth (N is an integer) CORESET ID / search space ID / TCI state ID. Also, the one TCI state to be selected / decided may be the first TCI state among a plurality (e.g., two) of TCI states.

[0135] Regarding SFN PDCCH, the one TCI state to be selected / decided may be a TCI state corresponding to a specific TCI state ID. The specific TCI state ID may be the minimum (or maximum) CORESET ID / search space ID / TCI state ID. Also, the specific TCI state ID may be the Nth (N is an integer) TCI state ID. Also, the one TCI state to be selected / decided may be the first TCI state among a plurality (e.g., two) of TCI states.

[0136] 《Embodiments 1-3》 The TCI state or QCL assumption of PDSCH may correspond to a plurality (e.g., two) of TCI states (which may be a plurality of TCI states). The UE may assume / judge that the TCI state or QCL assumption of PDSCH corresponds to a plurality (e.g., two) of TCI states.

[0137] Embodiments 1-3 may be applied to a case where, for example, in DCI without a TCI field, the upper layer is set to receive PDSCH corresponding to a plurality (e.g., two) of TCI states.

[0138] In Embodiments 1-3, the UE may be set with a plurality (e.g., two) of TCI states to be used for receiving PDSCH according to the setting of the upper layer.

[0139] According to the first embodiment above, even in at least one of the cases where the PDSCH is scheduled by DCI without a TCI field and where the scheduling offset is greater than or equal to the threshold, the reception of the PDSCH / TCI state setting can be appropriately controlled.

[0140] <Second Embodiment> The second embodiment may be applied when the scheduling offset is less than the threshold (timeDurationForQCL).

[0141] The TCI state or QCL assumption of the PDSCH may be the default TCI state. For example, the default TCI state may be the TCI state corresponding to a specific CORESET in a specific slot. The specific CORESET may be the CORESET corresponding to the minimum (or maximum) CORESET ID. Also, the specific slot may be the latest slot.

[0142] <Embodiment 2-1> The TCI state or QCL assumption of the PDSCH may be the same as the TCI state or QCL assumption of a specific CORESET. The UE may assume / judge that the TCI state or QCL assumption of the PDSCH is the same as the TCI state or QCL assumption of a specific CORESET. The specific CORESET may be the CORESET corresponding to the minimum (or maximum) CORESET ID in a specific slot (e.g., the latest slot).

[0143] When the CORESET / scheduling DCI corresponds to the PDCCH of a single TRP, the UE may determine that the scheduled PDSCH is a single TRP PDSCH.

[0144] When the CORESET / scheduling DCI corresponds to the SFN PDCCH, the UE may determine that the scheduled PDSCH is the SFN PDSCH. At this time, one or more (for example, two) TCI states set in the CORESET / search space / DCI / PDCCH may be used / applied to the SFN PDSCH.

[0145] When the CORESET / scheduling DCI corresponds to the repeated transmission of the PDCCH, the UE may determine that the scheduled PDSCH is the SFN PDSCH. At this time, the TCI states used for one or more (for example, two) search space sets (linked search space sets) associated with one or more (for example, two) CORESETs may be used / applied to the SFN PDSCH.

[0146] Also, when the CORESET / scheduling DCI corresponds to the repeated transmission of the PDCCH, the UE may determine that the scheduled PDSCH is the repeated transmission of the PDSCH. At this time, the TCI states used for one or more (for example, two) search space sets (linked search space sets) associated with one or more (for example, two) CORESETs may be used / applied to the repeated transmission of the PDSCH.

[0147] 《Embodiment 2-2》 The TCI state or QCL assumption of the PDSCH may correspond to one TCI state (single TRP) (it may be one TCI state). The UE may assume / determine that the TCI state or QCL assumption of the PDSCH corresponds to one TCI state. At this time, the UE may assume a single TRP.

[0148] The UE does not have to assume / expect that the SFN PDSCH or the SFN PDSCH by repeated transmission of the PDCCH is scheduled.

[0149] When the UE is scheduled for an SFN PDSCH or an SFN PDSCH by repeated transmission of PDCCH, the UE may select / determine one TCI state from one or more (e.g., two) TCI states corresponding to the CORESET.

[0150] Regarding the repeated transmission of PDCCH, the one TCI state selected / determined may be a TCI state corresponding to a specific CORESET ID / search space ID / TCI state ID. The specific CORESET ID / search space ID / TCI state ID may be the minimum (or maximum) CORESET ID / search space ID / TCI state ID. Also, the specific CORESET ID / search space ID / TCI state ID may be the Nth (N is an integer) CORESET ID / search space ID / TCI state ID. Also, the one TCI state selected / determined may be the first TCI state among a plurality (e.g., two) of TCI states.

[0151] Regarding the SFN PDCCH, the one TCI state selected / determined may be a TCI state corresponding to a specific TCI state ID. The specific TCI state ID may be the minimum (or maximum) CORESET ID / search space ID / TCI state ID. Also, the specific TCI state ID may be the Nth (N is an integer) TCI state ID. Also, the one TCI state selected / determined may be the first TCI state among a plurality (e.g., two) of TCI states.

[0152] 《Embodiment 2-3》 The TCI state or QCL assumption of the PDSCH may correspond to a plurality (e.g., two) of TCI states (which may be a plurality of TCI states). The UE may assume / judge that the TCI state or QCL assumption of the PDSCH corresponds to a plurality (e.g., two) of TCI states.

[0153] Embodiment 1-3 may be applied to a case where, for example, in DCI without a TCI field, the upper layer sets to receive a PDSCH corresponding to a plurality (for example, two) of TCI states.

[0154] In Embodiment 1-3, the UE may be configured with a plurality (for example, two) of TCI states to be used for receiving the PDSCH by setting of the upper layer.

[0155] According to the second embodiment above, even when the scheduling offset is smaller than the threshold, reception of the PDSCH / TCI state setting can be appropriately controlled.

[0156] <Other Embodiments> Upper layer parameters (RRC IE) / UE capabilities corresponding to the functions (features) in at least one of the above-described plurality of embodiments may be defined. The UE capabilities may indicate support for this function.

[0157] A UE configured with an upper layer parameter corresponding to (enabling) that function may perform that function. It may be defined that "a UE not configured with an upper layer parameter corresponding to that function does not perform that function (for example, in accordance with Rel. 15 / 16)".

[0158] A UE that reports UE capabilities indicating support for that function may perform that function. It may be defined that "a UE that does not report UE capabilities indicating support for that function does not perform that function (for example, in accordance with Rel. 15 / 16)".

[0159] If the UE reports UE capabilities indicating that it supports the function and the upper layer parameters corresponding to the function are configured, the UE may perform the function. It may be specified that "if the UE does not report UE capabilities indicating that it supports the function or the upper layer parameters corresponding to the function are not configured, the UE shall not perform the function (e.g., in accordance with Rel.15 / 16)".

[0160] The UE capabilities may indicate whether the UE supports this function.

[0161] The UE capabilities may indicate whether the UE supports the reception of SFN PDSCH.

[0162] The UE capabilities may indicate whether the UE supports the reception of SFN PDCCH.

[0163] According to the above embodiments, the UE can implement the above functions while maintaining compatibility with existing specifications.

[0164] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0165] FIG. 6 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0166] In addition, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0167] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0168] The wireless communication system 1 may support dual connectivity between a plurality of base stations within the same RAT (for example, NR-NR Dual Connectivity (NN-DC) where both the MN and the SN are base stations (gNBs) of NR).

[0169] The wireless communication system 1 may include a base station 11 that forms a relatively wide-coverage macro cell C1, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a smaller small cell C2 than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to the modes shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0170] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0171] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0172] Also, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0173] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper-level station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0174] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0175] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, 5G, etc.

[0176] In the wireless communication system 1, an Orthogonal Frequency Division Multiplexing (OFDM)-based wireless access method may be used. For example, in at least one of the Downlink (DL) and the 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. may be used.

[0177] The wireless access method may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0178] In the wireless communication system 1, as downlink channels, a Physical Downlink Shared Channel (PDSCH) shared by each user terminal 20, a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), etc. may be used.

[0179] Also, in the wireless communication system 1, as uplink channels, a Physical Uplink Shared Channel (PUSCH) shared by each user terminal 20, a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), etc. may be used.

[0180] User data, upper layer control information, a System Information Block (SIB), etc. are transmitted by the PDSCH. User data, upper layer control information, etc. may be transmitted by the PUSCH. Also, a Master Information Block (MIB) may be transmitted by the PBCH.

[0181] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, downlink control information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0182] Note that the DCI for scheduling the PDSCH may be called a DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called a UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0183] For PDCCH detection, a control resource set (CORESET) and a search space may be used. The CORESET corresponds to the resource for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0184] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be mutually substituted.

[0185] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (e.g., may be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for connection establishment with the cell may be transmitted by PRACH.

[0186] Note that in the present disclosure, downlink, uplink, etc. may be expressed without adding "link". Also, "Physical" may not be added at the beginning of various channels.

[0187] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may 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)), etc. may be transmitted.

[0188] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0189] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0190] (Base station) FIG. 7 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0191] In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processes of each part described below may be omitted.

[0192] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0193] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal, and transfer it to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0194] The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0195] The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0196] The transmission / reception antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0197] The transmission / reception unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 120 may receive the above-described uplink channel, uplink reference signal, etc.

[0198] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0199] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0200] The transmission / reception unit 120 (transmission processing unit 1211) may perform transmission processing such as channel encoding (which may include error correction encoding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0201] The transmission / reception unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0202] On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 130.

[0203] The transmission / reception unit 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the acquired baseband signal, and acquire user data, etc.

[0204] The transmission / reception unit 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may 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 may be output to the control unit 110.

[0205] The transmission path interface 140 may transmit and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0206] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0207] The transmission / reception unit 120 may transmit downlink control information (DCI) for scheduling the physical downlink shared channel (PDSCH). A field for indicating the transmission configuration indication (TCI) state of the PDSCH may or may not exist in the DCI. The control unit 110 may apply a TCI state to the PDSCH. Based on the existence of the field in the DCI, whether the PDSCH is any one of a PDSCH from a single transmission / reception point, a PDSCH using a single frequency network (SFN), or a repeated transmission of the PDSCH, and the TCI state applied to the transmission of the PDSCH may be determined by the terminal (First and Second Embodiments).

[0208] (User Equipment) FIG. 8 is a diagram showing an example of the configuration of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0209] Note that in this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and the user equipment 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0210] The control unit 210 controls the entire user equipment 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0211] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transmission / reception unit 220.

[0212] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0213] The transceiver unit 220 may be configured as an integrated transceiver unit, or may be composed of a transmitter unit and a receiver unit. The transmitter unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiver unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0214] The transceiver antenna 230 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0215] The transceiver unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0216] The transceiver unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0217] The transceiver unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 210, and generate a bit sequence to be transmitted.

[0218] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel encoding (which may include error correction encoding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0219] Note that whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above-mentioned transmission processing to transmit the channel using the DFT-s-OFDM waveform; otherwise, it may not perform DFT processing as the above-mentioned transmission processing.

[0220] The transmission / reception unit 220 (RF unit 222) may perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0221] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to the baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 230.

[0222] The transmission / reception unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the acquired baseband signal, and acquire user data, etc.

[0223] The transmission / reception unit 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0224] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0225] The transmission / reception unit 220 may receive downlink control information (DCI) for scheduling the physical downlink shared channel (PDSCH). The control unit 210 may determine whether the PDSCH is a PDSCH from a single transmission / reception point, a PDSCH using a single frequency network (SFN), or a repeated transmission of the PDSCH, and the TCI state to be applied to the reception of the PDSCH, based on the presence of a field in the DCI that indicates the transmission configuration indication (TCI) state of the PDSCH (First and Second Embodiments).

[0226] The control unit 210 may determine that the TCI state used for receiving the PDSCH is the same TCI state as the TCI state corresponding to a specific control resource set (First and Second Embodiments).

[0227] The control unit 210 may determine that the TCI state used for receiving the PDSCH corresponds to one TCI state (First and Second Embodiments).

[0228] The control unit 210 may determine that the TCI state used for receiving the PDSCH corresponds to two TCI states (First and Second Embodiments).

[0229] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0230] Here, functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the realization method is not particularly limited.

[0231] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 9 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may physically be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0232] In the present disclosure, terms such as apparatus, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0233] For example, although only one processor 1001 is illustrated, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0234] Each function in the base station 10 and the user terminal 20 is realized, for example, by causing a predetermined software (program) to be loaded onto hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs calculations to control communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0235] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0236] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may be true for other functional blocks.

[0237] The memory 1002 is a computer-readable recording medium, and may be constituted by, for example, at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other appropriate storage media. The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0238] The storage 1003 is a computer-readable recording medium, and may be constituted by, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0239] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), the transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated and implemented by a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0240] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0241] Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0242] In addition, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0243] (Modification example) Regarding the terms described in this disclosure and the terms necessary for understanding this disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applicable standard. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0244] The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be called a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0245] Here, the new numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The new numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering process performed by the transceiver in the frequency domain, specific windowing process performed by the transceiver in the time domain, etc.

[0246] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on the new numerology.

[0247] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (PUSCH) mapping type B.

[0248] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. Different names may be used for the radio frame, sub-frame, slot, mini-slot, and symbol respectively. Note that the time units such as frame, sub-frame, slot, mini-slot, and symbol in this disclosure may be read interchangeably with each other.

[0249] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0250] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used at each user terminal) to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0251] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0252] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit of the scheduling may be controlled.

[0253] A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0254] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0255] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0256] Also, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0257] One or more RBs may also be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0258] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0259] A Bandwidth Part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0260] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be set within one carrier for a UE.

[0261] At least one of the set BWPs may be active, and it may not be assumed that the UE transmits and receives a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0262] Note that the structures such as the above-described radio frame, subframe, slot, minislot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be changed in various ways.

[0263] Also, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0264] The names used for parameters, etc. in this disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0265] The information, signals, etc. described in this disclosure may be represented using any of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0266] Also, information, signals, etc. can be output at least one of from a higher layer to a lower layer and from a lower layer to a higher layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0267] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0268] The notification of information is not limited to the aspects / embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper 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.

[0269] Note that physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, RRC signaling may be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0270] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0271] The determination may be made by a value represented by 1 bit (0 or 1), may be made by a boolean value (true or false), or may be made by a numerical comparison (for example, comparison with a predetermined value).

[0272] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by some other name.

[0273] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0274] The terms "system" and "network" used in the present disclosure may be used interchangeably. "Network" may mean a device (such as a base station) included in the network.

[0275] In the present disclosure, terms such as "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.

[0276] In the present disclosure, terms such as "Base Station (BS)", "radio 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", etc. can be used interchangeably. The base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0277] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0278] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0279] A mobile station may also be called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.

[0280] At least one of the base station and the mobile station may also be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0281] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station 10 described above may be configured to be functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be replaced with a sidelink channel.

[0282] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the user terminal 20 described above may be configured to be functions of the base station 10.

[0283] In the present disclosure, operations assumed to be performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by a base station, one or more network nodes other than the base station (for example, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0284] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0285] Each aspect / embodiment described in the present disclosure may be applied to systems using 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), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x is, for example, an integer or a decimal), 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), other suitable wireless communication methods, and next-generation systems extended based on these. Further, multiple systems may be combined and applied (for example, a combination of LTE or LTE-A and 5G).

[0286] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0287] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any way.

[0288] The term "determining" as used in this disclosure may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database, or another data structure), "ascertaining", etc.

[0289] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in memory), etc.

[0290] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be making some kind of operation.

[0291] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0292] The "maximum transmit power" described in the present disclosure may mean the maximum value of the transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0293] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed".

[0294] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, optical (both visible and invisible) region, etc.

[0295] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0296] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0297] In the present disclosure, for example, when articles are added by translation, such as a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0298] As described above, the invention according to the present disclosure has been described in detail. However, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and changed forms without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiving unit that receives downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); a control unit that determines that when the offset between the reception of the DCI and the PDSCH is greater than or equal to a specific threshold and there is no field in the DCI that indicates the transmission configuration indication (TCI) state of the PDSCH, the PDSCH is a PDSCH from the single transmission and reception point (TRP) when the DCI corresponds to a physical downlink control channel (PDCCH) of a single TRP, and the PDSCH is a PDSCH using the single frequency network (SFN) when the DCI corresponds to a PDCCH using the SFN; a terminal having the same.

2. The terminal according to claim 1, wherein when the offset is smaller than the specific threshold, the control unit assumes that the PDSCH corresponds to two TCI states.

3. a step of receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); a step of determining that when the offset between the reception of the DCI and the PDSCH is greater than or equal to a specific threshold and there is no field in the DCI that indicates the transmission configuration indication (TCI) state of the PDSCH, the PDSCH is a PDSCH from the single transmission and reception point (TRP) when the DCI corresponds to a physical downlink control channel (PDCCH) of a single TRP, and the PDSCH is a PDSCH using the single frequency network (SFN) when the DCI corresponds to a PDCCH using the SFN; a wireless communication method for a terminal having the same.

4. A system having a base station and a terminal, wherein the base station has a transmission unit that transmits downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), wherein the terminal has a receiving unit that receives the DCI, When the offset between the reception of the DCI and the PDSCH is equal to or greater than a specific threshold, and there is no field in the DCI that indicates the transmission configuration indication (TCI) state of the PDSCH, when the DCI corresponds to a physical downlink control channel (PDCCH) of a single transmit-receive point (TRP), the PDSCH is a PDSCH from the single TRP, and when the DCI corresponds to a PDCCH that uses a single frequency network (SFN), it is determined that the PDSCH is a PDSCH that uses the SFN, a system having a control unit.

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