Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure is provided with a receiving unit for receiving downlink control information for scheduling physical downlink shared channel, and a control unit for determining whether, on the basis of the downlink control information, a high-speed movement scheme is applied to the physical downlink shared channel. According to an aspect of the present disclosure, downlink signals from a plurality of transmission points can be received appropriately.

Description

[Technical field]

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. 、 base station and systems Regarding. [Background technology]

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of achieving higher capacity and greater sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), it is expected that beams transmitted from transmission points (e.g., Remote Radio Heads (RRHs)) placed along the path of a fast-moving vehicle (e.g., a train) will be used to realize wireless communication in the vehicle.

[0006] However, there has been insufficient consideration as to how a terminal receives downlink signals transmitted from multiple transmission points. If such operations are not clearly understood, this could result in a decrease in throughput.

[0007] Therefore, the present disclosure relates to a terminal and a wireless communication method for appropriately receiving downlink signals from a plurality of transmission points. 、 base station and systems One of the aims is to provide. [Means for solving the problem]

[0008] A terminal according to an embodiment of the present disclosure is (PDSCH) Downlink control information that schedules (DCI) A receiving unit for receiving the If DCI is received in the UE specific search space (USS) set, High speed movement scheme By The above and controlling to receive a PDSCH by a single Transmission / Reception Point (TRP) when the DCI is received in a Common Search Space (CSS) set. and a control unit. Effect of the Invention

[0009] According to one aspect of the present disclosure, downlink signals from multiple transmission points can be properly received. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are diagrams illustrating an example of communication between a mobile unit and a transmission point (eg, RRH). [Diagram 2]2A to 2C are diagrams illustrating an example of schemes 0 to 2 for SFN. [Diagram 3] 3A and 3B show an example of Scheme 1. [Figure 4] 4A to 4C are diagrams illustrating an example of a NW pre-compensation scheme. [Diagram 5] FIG. 5 is a diagram showing an example of the embodiment 1-1. [Figure 6] FIG. 6 is a diagram showing a modification of the embodiment 1-3. [Figure 7] FIG. 7 is a diagram illustrating an example of the second embodiment. [Figure 8] 8A and 8B are diagrams showing an example of the Doppler shift of a DL received signal according to the second embodiment. [Figure 9] FIG. 9 is a diagram showing an example of embodiment 3-1. [Figure 10] 10A and 10B are diagrams illustrating an example of the fourth embodiment. [Figure 11] FIG. 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (TCI, spatial relations, QCL) In NR, it is considered to control reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0012] The TCI state may represent that which is applied to a downlink signal / channel. The equivalent of the TCI state which is applied to an uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information on the Quasi-Co-Location (QCL) of signals / channels, and may be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or for each signal.

[0014] A QCL is an index that indicates the statistical properties of a signal / channel. For example, when a signal / channel and another signal / channel are in a QCL relationship, it may mean that it can be assumed that at least one of the following is the same (QCL with respect to at least one of the following) between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0015] In addition, the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be specified based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with a spatial QCL (sQCL).

[0016] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types AD may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be called QCL parameters) are as follows: QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay, · QCL type D (QCL-D): spatial reception parameters.

[0017] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0018] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumptions of the signal / channel.

[0019] The TCI state may be, for example, information about the QCL of the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.

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

[0021] The channel for which the TCI state or spatial relationship 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] In addition, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0023] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may be referred to as an SS / PBCH block.

[0024] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (its DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0025] (default TCI state / default spatial relationship / default PL-RS) In the RRC connected mode, in both cases where the TCI information in DCI (higher layer parameter TCI-PresentInDCI) is set to "enabled" and where the TCI information in DCI is not set, if the time offset between the reception of DL DCI (DCI that schedules PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is smaller than a threshold (timeDurationForQCL) (applicable 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 in the active DL BWP of the CC (of the 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 in the active DL BWP of the scheduled CC.

[0026] In Rel.15, separate MAC CEs are required for activation / deactivation of PUCCH spatial relation and activation / deactivation of SRS spatial relation. PUSCH spatial relation follows SRS spatial relation.

[0027] In Rel.16, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relationship and the MAC CE for activation / deactivation of the SRS spatial relationship may not be used.

[0028] If neither the spatial relationship nor the PL-RS for the PUCCH is configured in FR2 (applicable condition, second condition), the default assumptions of the spatial relationship and the PL-RS for the PUCCH (default spatial relationship and default PL-RS) are applied. If neither the spatial relationship nor the PL-RS for the SRS (SRS resource for the SRS, or SRS resource corresponding to the SRI in DCI format 0_1 ​​that schedules the PUSCH) is configured in FR2 (applicable condition, second condition), the default assumptions of the spatial relationship and the PL-RS for the PUSCH and the SRS scheduled by DCI format 0_1 ​​(default spatial relationship and default PL-RS) are applied.

[0029] If a CORESET is configured in an active DL BWP on the CC (condition applicable), the default spatial relationship and default PL-RS may be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in the active DL BWP. If a CORESET is not configured in an active DL BWP on the CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest PDSCH ID in the active DL BWP.

[0030] In Rel.15, the spatial relationship of PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of PUCCH on the same CC. The network needs to update the PUCCH spatial relationship on all SCells even if no PUCCH is transmitted on the SCell.

[0031] In Rel.16, PUCCH configuration is not required for a PUSCH scheduled by DCI format 0_0. If there is no active PUCCH spatial relationship or no PUCCH resource on the active UL BWP in the CC for a PUSCH scheduled by DCI format 0_0 (applicable condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.

[0032] The application condition of the default spatial relationship / default PL-RS for SRS may include a default beam path loss enable information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) being set to valid. The application condition of the default spatial relationship / default PL-RS for PUCCH may include a default beam path loss enable information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) being set to valid. The application condition of the default spatial relationship / default PL-RS for PUSCH scheduled by DCI format 0_0 may include a default beam path loss enable information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) being set to valid.

[0033] The above threshold may also be referred to as 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.

[0034] If the offset between reception of DL DCI and its corresponding PDSCH is less than a threshold timeDurationForQCL, and at least one TCI state configured for the serving cell of the scheduled PDSCH includes "QCL type D", and the UE is configured with the two default TCI enable parameter (enableTwoDefaultTCIStates-r16), and at least one TCI codepoint indicates two TCI states, the UE shall assume that the DMRS port of the PDSCH or PDSCH transmission occasion of the serving cell is quasi co-located with the RS for the QCL parameters associated with the two TCI states corresponding to the lowest codepoint of the TCI codepoints that include two different TCI states. The two default TCI enable parameter indicates that the Rel. 16 operation of the two default TCI states for the PDSCH when at least one TCI codepoint is mapped to two TCI states is enabled.

[0035] (Multi-TRP) In NR, it is considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will perform DL transmission to a UE using one or more panels (multi-panels). It is also considered that a UE will perform UL transmission to one or more TRPs using one or more panels.

[0036] 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.

[0037] Multi-TRP (e.g., TRP#1, #2) may be connected by ideal / non-ideal backhaul to exchange information, data, etc. Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0038] In the NCJT, for example, TRP#1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP#2 performs modulation mapping and layer mapping on a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0039] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with at least one of the time and frequency resources.

[0040] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0041] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) 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 using multiple DCIs (multiple DCI, multiple PDCCHs) respectively (multi-master mode, multi-DCI based multi-TRP).

[0042] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. It is considered that repetition schemes (URLLC schemes, for example, schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0043] Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.

[0044] In order to support intra-cell (having the same cell ID) and inter-cell (having different cell IDs) multi-TRP transmission based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs having multiple TRPs, one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0045] If at least one of the following conditions 1 and 2 is satisfied, the UE may determine that the TRP is based on the multi-DCI. In this case, the TRP may be replaced with a CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (eg, 0 and 1) are set.

[0046] If the following conditions are met, the UE may determine that the UE is multi-TRP based on a single DCI. In this case, the two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [conditions] "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 the DCI.

[0047] The DCI for common beam instruction may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)) or a UE-group common DCI format.

[0048] (HST) In LTE, it is difficult to place HST in a tunnel. Large antennas transmit outside / inside the tunnel. For example, the transmission power of a large antenna is about 1 to 5W. For handover, it is important that the UE transmits outside the tunnel before entering the tunnel. For example, the transmission power of a small antenna is about 250mW. Multiple small antennas (transmitting / receiving points) with the same cell ID and distance of 300m 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 transmits and receives to one base station. In reality, multiple transmitting / receiving points transmit the same DL signal. When moving at high speed, transmitting / receiving points of several kilometers form one cell. Handover is performed when crossing cells. This can reduce the handover frequency.

[0049] In NR, it is assumed that a beam transmitted from a transmission point (e.g., RRH) will be used to communicate with a terminal (hereinafter, also referred to as UE) included in a moving object (HST (high speed train)) such as a train moving at high speed. Existing systems (e.g., Rel. 15) support communication with a moving object by transmitting a unidirectional beam from the RRH (see Figure 1A).

[0050] FIG. 1A shows a case where RRHs are installed along the moving path (or moving direction, traveling direction, traveling path) of a moving object, and a beam is formed from each RRH in the moving direction of the moving object. An RRH that forms a beam in one direction may be called a uni-directional RRH. In the example shown in FIG. 1A, the moving object receives a negative Doppler shift (-f D ) will be received.

[0051] Note that, although the case where a beam is formed in the direction of travel of the moving body is shown here, this is not limited to the case, and a beam may be formed in the opposite direction to the direction of travel, or a beam may be formed in any direction regardless of the direction of travel of the moving body.

[0052] In Rel.16 and later, it is assumed that multiple (e.g., two or more) beams will be transmitted from the RRH. For example, it is assumed that beams will be formed in both the moving direction of the moving object and the opposite direction (see Figure 1B).

[0053] 1B shows a case where RRHs are installed along the moving path of a moving object, and beams are formed from each RRH in both the moving direction of the moving object and the opposite direction of the moving direction. An RRH that forms beams in multiple directions (for example, two directions) may be called a bi-directional RRH.

[0054] In HST, the UE communicates in the same way as with a single TRP. In base station implementations, it is possible to transmit from multiple TRPs (same cell ID).

[0055] In the example of FIG. 1B, when two RRHs (RRH#1 and RRH#2 in this case) use SFN, the signal that the moving object receives at the midpoint between the two RRHs is switched from a signal that has undergone a negative Doppler shift to a signal that has undergone a positive Doppler shift with higher power. In this case, the maximum Doppler shift change range that requires correction is -f D From +f DThis is double the change compared to the unidirectional RRH.

[0056] Here, the following schemes 0 to 2 are compared. In scheme 0 of FIG. 2A, a tracking reference signal (TRS), a DMRS, and a PDSCH are transmitted in common (using the same time and same frequency resources) to two TRPs (RRHs) (normal SFN, transparent SFN). In scheme 1 of FIG. 2B, a TRS is transmitted TRP-specifically (using different time / frequency resources depending on the TRP). In this example, TRS1 is transmitted from TRP#1, and TRS2 is transmitted from TRP#2. In scheme 2 of FIG. 2C, a TRS and a DMRS are transmitted TRP-specifically. In this example, TRS1 and DMRS1 are transmitted from TRP#1, and TRS2 and DMRS2 are transmitted from TRP#2. Compared to scheme 0, schemes 1 and 2 can suppress abrupt changes in Doppler shift and appropriately estimate / guarantee the Doppler shift. Since the DMRS in scheme 2 increases more than the DMRS in scheme 1, the maximum throughput of scheme 2 is lower than that of scheme 1.

[0057] In scheme 0, the UE switches between single TRP and SFN based on higher layer signaling (RRC information elements / MAC CE).

[0058] The UE may switch between scheme 1 / scheme 2 / NW pre-compensation schemes based on higher layer signaling (RRC information element / MAC CE).

[0059] In scheme 1, two TRS resources are set for the HST travel direction and the reverse direction, respectively.

[0060] In the example of Fig. 3A, the TRPs (TRP#0, #2, ...) transmitting DL signals in the opposite direction to the HST transmit the first TRS (TRS arriving before the HST) in the same time and frequency resource (SFN). The TRPs (TRP#1, #3, ...) transmitting DL signals in the traveling direction of the HST transmit the second TRS (TRS arriving after the HST) in the same time and frequency resource (SFN). The first TRS and the second TRS may be transmitted / received using different frequency resources.

[0061] 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.

[0062] 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 beam of the first TRS and the beam of the second TRS are considered to be equal (QCL type D RS are equal). By multiplexing the first TRS and the second TRS into the same time resource and different frequency resource, the resource utilization efficiency can be improved.

[0063] In the example of Fig. 4A, RRHs #0-#7 are arranged along the movement path of the HST. RRHs #0-#3 and RRHs #4-#7 are connected to baseband units (BBUs) #0 and #1, respectively. Each RRH is a bidirectional RRH, and forms beams in both the moving direction of the movement path and the opposite direction using each transmission / reception point (TRP).

[0064] In the example of Figure 4B (single TRP (SFN) / scheme 1), when the UE receives a signal / channel (beam in the direction of travel of the HST, beam from behind the UE) transmitted from TRP#2n-1 (n is an integer equal to or greater than 0), a negative Doppler shift (-fD in this example) occurs. Also, when the UE receives a signal / channel (beam in the direction opposite to the direction of travel of the HST, beam from in front of the UE) transmitted from TRP#2n (n is an integer equal to or greater than 0), a positive Doppler shift (+fD in this example) occurs.

[0065] In Rel. 17 and later, it has been considered to perform Doppler shift compensation (which may also be called Doppler Compensation, Pre-Doppler Compensation, or network (NW) pre-compensation scheme) when transmitting a downlink (DL) signal / channel from a TRP to a UE in an HST. The TRP performs Doppler compensation in advance when transmitting a DL signal / channel to a UE, thereby making it possible to reduce the effect of Doppler shift when the UE receives the DL signal / channel. 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.

[0066] In the NW pre-compensation scheme, the TRP that forms a beam in the direction of travel of the moving path and the TRP that forms a beam in the opposite direction of the moving path transmit DL signals / channels to the UE in the HST after performing Doppler compensation. In this example, TRP#2n-1 performs positive Doppler compensation and TRP#2n performs negative Doppler compensation to reduce the effect of Doppler shift when the UE receives the signal / channel (Figure 4C).

[0067] (analysis) Since Rel.15 / 16 UE does not support the HST function (Rel.17 and later), the base station builds a cell according to the Rel.15 SFN. Since a new release UE (Rel.17 and later) supports the HST function when it reports the UE capability that supports the HST function, the base station builds a cell according to the HST function. However, there may be cases where the base station is unable to build an appropriate cell for the UE. If an appropriate cell is not built for the UE, there is a risk of degradation in communication performance, such as a drop in throughput.

[0068] Therefore, the present inventors came up with the idea of ​​switching between SFN (Rel. 15) and HST.

[0069] It is preferable that the base station is capable of dynamically switching between Rel.15 SFN and the new release HST (HST scheme).

[0070] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0071] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read as interchangeable. In the present disclosure, index, ID, indicator, resource ID may be read as interchangeable. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0072] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read as interchangeable.

[0073] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), RRC messages, and settings may be read as interchangeable.

[0074] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. In the present disclosure, the MAC CE, an update command, and an activation / deactivation command may be read as interchangeable.

[0075] The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI, SIB1), Other System Information (OSI), etc.

[0076] 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 in TCI state / QCL assumption, RS of QCL type A in TCI state / QCL assumption, spatial relationship, 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 interchangeable. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS, may be read as interchangeable.

[0077] In the present disclosure, panel, Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (e.g., DeModulation Reference Signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer), may be read as mutually interchangeable. Also, panel identifier (ID) and panel may be read as mutually interchangeable. In the present disclosure, TRP ID and TRP may be read as mutually interchangeable.

[0078] The panel may be associated with at least one of a group index of an SSB / CSI-RS group, a group index of a group-based beam report, and a group index of an SSB / CSI-RS group for group-based beam reporting.

[0079] In addition, a panel identifier (ID) and a panel may be interchangeable. That is, a TRP ID and a TRP, a CORESET group ID and a CORESET group, etc. may be interchangeable.

[0080] In the present disclosure, a TRP, a transmission point, a panel, a DMRS port group, a CORESET pool, and one of two TCI states associated with one code point in a TCI field may be read as interchangeable.

[0081] In this disclosure, a single PDCCH (DCI) may be assumed to be supported when multiple TRPs use an ideal backhaul. Multiple PDCCHs (DCI) may be assumed to be supported when multiple TRPs use a non-ideal backhaul.

[0082] In addition, the ideal backhaul may be called DMRS port group type 1, reference signal associated group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may be called DMRS port group type 2, reference signal associated group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0083] In the present disclosure, single TRP, single TRP system, single TRP transmission, and single PDSCH may be interchangeable. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interchangeable. In the present disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, and activating two TCI states on at least one TCI codepoint may be interchangeable.

[0084] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, multi-TRP not being enabled by RRC / DCI, multiple TCI states / spatial relationships not being enabled by RRC / DCI, a CORESETPoolIndex value of 1 not being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as interchangeable.

[0085] In the present disclosure, multi-TRP, channel using multi-TRP, channel using multiple TCI states / spatial relationships, multi-TRP being enabled by RRC / DCI, multiple TCI states / spatial relationships being enabled by RRC / DCI, and at least one of multi-TRP based on a single DCI and multi-TRP based on a multiple DCI may be read as mutually interchangeable. In the present disclosure, multi-TRP based on a multiple DCI, and a CORESETPoolIndex value of 1 being set for CORESET may be read as mutually interchangeable. In the present disclosure, multi-TRP based on a single DCI, and at least one code point of a TCI field being mapped to two TCI states may be read as mutually interchangeable.

[0086] In the present disclosure, TRP#1 (first TRP) may correspond to CORESET pool index=0 or may correspond to the first of two TCI states corresponding to one code point in the TCI field. TRP#2 (second TRP) TRP#1 (first TRP) may correspond to CORESET pool index=1 or may correspond to the second of two TCI states corresponding to one code point in the TCI field.

[0087] In the present disclosure, single DCI (sDCI), single PDCCH, multi-TRP system based on single DCI, sDCI-based MTRP, and activating two TCI states on at least one TCI codepoint may be read as interchangeable.

[0088] In the present disclosure, multi-DCI (mDCI), multi-PDCCH, multi-TRP system based on multi-DCI, mDCI-based MTRP, and setting two CORESET pool indices or CORESET pool index=1 (or a value greater than or equal to 1) may be read as interchangeable.

[0089] The QCL of the present disclosure may be interchangeably read as QCL type D.

[0090] In this disclosure, expressions such as "TCI state A is the same QCL type D as TCI state B," "TCI state A is the same as TCI state B," and "TCI state A is QCL type D as TCI state B" may be interpreted as interchangeable.

[0091] In the present disclosure, DMRS, DMRS port, and antenna port may be interpreted as interchangeable.

[0092] In the present disclosure, CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, tracking CSI-RS, CSI-RS having TRS information (higher layer parameter trs-Info), NZP CSI-RS resource in an NZP CSI-RS resource set having TRS information, NZP-CSI-RS resource in an NZP-CSI-RS resource set consisting of multiple NZP-CSI-RS resources of the same antenna port, and TRS resource may be interchangeable. In the present disclosure, CSI-RS resource, CSI-RS resource set, CSI-RS resource group, and information element (IE) may be interchangeable.

[0093] In the present disclosure, the code point of the DCI field 'Transmission Configuration Indication', the TCI code point, the DCI code point, and the code point of the TCI field may be read as interchangeable.

[0094] In the present disclosure, the terms "single TRP" and "SFN" may be interchangeable. In the present disclosure, the terms "HST", "HST scheme", "high speed movement scheme", "scheme 1", "scheme 2" and "NW pre-compensation scheme" may be interchangeable.

[0095] (Wireless communication method) <First embodiment> A single TRP (SFN) and an HST scheme (scheme 1 / scheme 2 / NW pre-compensation scheme) may be dynamically switched.

[0096] In the following, the case where the first embodiment is applied to Scheme 1 will be mainly described, but the first embodiment may also be applied to Scheme 2 / NW pre-compensation scheme. That is, in the first embodiment, Scheme 1, Scheme 2, and NW pre-compensation scheme may be read as interchangeable.

[0097] The UE may follow any of the following aspects 1-1 to 1-2.

[0098] <<Aspect 1-1>> For the HST schemes (Scheme 1 / Scheme 2 / NW pre-compensation scheme), two TCI states are set / indicated.

[0099] For each TCI code point (TCI field code point, DCI code point), one or two TCI states can be set / indicated. The TCI state may be indicated using RRC information element / MAC CE (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) / DCI (TCI field) as in the single DCI-based multi-TRP in Rel.16.

[0100] In the example of Figure 5, the MAC CE indicates (maps) one or two TCI states for each TCI codepoint. The TCI field (e.g., in DCI formats 1_1 / 1_2) indicates one or two TCI states by indicating the TCI codepoint.

[0101] If one TCI state is indicated (eg, TCI codepoint 000 in this example is indicated), the UE may operate according to single TRP scheme 1.

[0102] If two TCI states are indicated (eg, TCI codepoint 001 in this example is indicated), the UE may operate according to scheme 1 (eg, PDSCH reception).

[0103] If Scheme 1 is configured by higher layer signaling (or if multiple TRS resources are configured), the UE may measure each TRS resource. If multiple TCI states are instructed to be used for receiving the PDSCH / PDCCH, the UE may operate (e.g., receive the PDSCH) according to Scheme 1. In Scheme 1, the UE may measure multiple Doppler shifts in multiple TRSs and receive / detect the PDSCH based on the measurement results.

[0104] For each TCI code point, one or two TCI states may be mapped. For each TCI code point, two TCI states may be mapped and the two TCI states (IDs) may be equal. For each TCI code point, two TCI states may be mapped and the two TCI states (IDs) may be different.

[0105] If the two TCI states indicated by the TCI fields are equal, the UE may operate according to a single TRP (SFN) (eg, PDSCH reception).

[0106] If the two TCI states indicated by the TCI field are equal, the UE may operate (e.g., receive PDSCH) according to the HST scheme (scheme 1 / scheme 2 / NW pre-compensation scheme). In this case, the TCI states may be equal between the two TRSs.

[0107] Variation of embodiment 1-1 For scheme 1 / 2, two TCI states are set / indicated.

[0108] The DCI may explicitly indicate whether or not a single TRP (SFN) is used. A TCI codepoint / field indicating whether or not a single TRP (SFN) is used may be specified for use, or may be indicated by higher layer signaling (RRC information element / MAC CE).

[0109] In the example of Figure 6, the lowest TCI code point (e.g., 000) may be specified to use a single TRP (SFN), and the mapping may be indicated by the MAC CE. The MAC CE may map one TCI state for a single TRP to this TCI code point.

[0110] <<Aspect 1-2>> Which of the single TRP / scheme 1 / scheme 2 / NW pre-compensation scheme is applied depends on the DCI (PDCCH) that schedules DL.

[0111] The scheme may depend on the DCI format. If the DCI format for scheduling the PDSCH is 1_1 / 1_2, the UE may operate (e.g., receive the PDSCH) according to scheme 1. If the DCI format for scheduling the PDSCH is 1_0, the UE may operate (e.g., receive the PDSCH) according to single TRP (SFN).

[0112] The scheme may depend on the RNTI used for DCI (scrambling of CRC for DCI). The RNTI for HST may be specified. The UE may switch schemes depending on the RNTI that scrambles the CRC of the DCI that schedules the PDSCH. If the PDSCH is scheduled by the DCI with the CRC scrambled by the RNTI for HST, the UE may operate (e.g., receive the PDSCH) according to a specific scheme (e.g., scheme 1).

[0113] A scheme may depend on a combination of multiple DCI fields. If the values ​​of each of multiple special fields are special values ​​defined in the specification, the UE may operate (e.g., receive PDSCH) according to a particular scheme (e.g., scheme 1).

[0114] The scheme may depend on the CORESET in which the DCI (PDCCH) scheduling the PDSCH is received. If the DCI scheduling the PDSCH is received in a UE-specific CORESET, the UE may operate (e.g., receive the PDSCH) according to a first scheme (e.g., scheme 1). If the DCI scheduling the PDSCH is received in a common CORESET, the UE may operate (e.g., receive the PDSCH) according to a second scheme (e.g., single TRP (SFN)).

[0115] The scheme may depend on the search space in which the DCI (PDCCH) scheduling the PDSCH is received. If the DCI scheduling the PDSCH is received in a UE-specific search space (USS), the UE may operate (e.g., receive the PDSCH) according to a first scheme (e.g., scheme 1). If the DCI scheduling the PDSCH is received in a common search space (CSS), the UE may operate (e.g., receive the PDSCH) according to a second scheme (e.g., single TRP (SFN)).

[0116] According to this embodiment, the base station / UE can dynamically switch between single TRP (SFN) and scheme 1 / 2 / NW pre-compensation scheme.

[0117] <Second embodiment> The single TRP (SFN) and the NW pre-compensation scheme may be dynamically switched. That is, the first embodiment may be applied to the switching between the single TRP (SFN) and the NW pre-compensation scheme.

[0118] In the NW pre-compensation scheme, the UE that has been notified of the TCI state may assume that the received signal is frequency compensated in PDSCH reception.

[0119] In the example of Figure 7, the MAC CE indicates (maps) one or two TCI states for each TCI codepoint. The TCI field (e.g., in DCI formats 1_1 / 1_2) indicates one or two TCI states by indicating the TCI codepoint.

[0120] If one TCI state is indicated (e.g., TCI code point 000 in this example is indicated), the UE may operate according to a single TRP (SFN) and assume that it receives a frequency-uncompensated PDSCH / DMRS (FIG. 8A) (but may not assume that it receives a frequency-compensated PDSCH / DMRS).

[0121] If two TCI states are indicated (e.g., TCI code point 001 in this example is indicated), the UE may be assumed to operate according to Scheme 1 and receive a frequency compensated PDSCH / DMRS (Figure 8B).

[0122] According to this embodiment, the base station / UE can dynamically switch between single TRP (SFN) and NW pre-compensation schemes.

[0123] <Third embodiment> Scheme 1 / 2 and the NW pre-compensation scheme may be dynamically switched.

[0124] In the following, a case where the third embodiment is applied to pinch-hitting switching between scheme 1 / 2 and the NW pre-compensation scheme will be described, but the third embodiment may be applied between at least two of the scheme 1, scheme 2, and the NW pre-compensation scheme. That is, in the third embodiment, the scheme 1, scheme 2, and the NW pre-compensation scheme may be read as interchangeable.

[0125] Whether scheme 1 / 2 or the NW pre-compensation scheme is used may depend on the TCI codepoint.

[0126] The UE may follow at least one of the following aspects 3-1 and 3-2.

[0127] <<Aspect 3-1>> Whether each TCI code point corresponds to scheme 1 / 2 or the NW pre-compensation scheme may be set / indicated by higher layer signaling (RRC information element / MAC CE) or may be specified in the specifications.

[0128] 9, TCI code points 000 to 011 are associated with scheme 1 / 2, and TCI code points 100 to 111 are associated with the NW pre-compensation scheme. The UE operates (e.g., receives PDSCH) according to the scheme corresponding to the TCI code point.

[0129] If the base station can know the appropriate Doppler shift, the NW pre-compensation scheme achieves the best performance, otherwise, the performance of scheme 1 may be higher than that of the NW pre-compensation scheme. It is preferable that the schemes 1 / 2 and the NW pre-compensation scheme are dynamically switched according to the CSI report value / SRS reception state for the base station to obtain the Doppler shift.

[0130] "Aspect 3-2" Whether scheme 1 / 2 or the NW pre-compensation scheme is used may depend on at least one of the number of TCI states associated with the TCI codepoint, the type associated with the TCI codepoint, the QCL type in the TCI state associated with the TCI codepoint, the upper layer parameters associated with the TCI state associated with the TCI codepoint, and the upper layer parameters associated with the TCI codepoint.

[0131] For example, higher layer signaling may associate with each TCI codepoint a parameter indicating whether scheme 1 / 2 or the NW pre-compensation scheme is to be used.

[0132] For example, the QCL type in the TCI state mapped to the TCI code point may be different between scheme 1 / 2 and the NW pre-compensation scheme, and the UE may operate (e.g., receive PDSCH) according to the scheme corresponding to the QCL type in the TCI state mapped to the TCI code point.

[0133] According to this embodiment, the base station / UE can dynamically switch between scheme 1 / 2 and the NW pre-compensation scheme.

[0134] <Fourth embodiment> The UE may follow at least one of the following aspects 4-1 and 4-2.

[0135] <<Aspect 4-1>> When any of the HST schemes (scheme 1 / scheme 2 / NW pre-compensation scheme) is configured, the UE uses multiple TCI states / QCLs for receiving the PDSCH.

[0136] Multiple TCI states per PDSCH may be set / indicated by the RRC information element / MAC CE / DCI.

[0137] Similar to the method of indicating the TCI state of a single DCI-based multi-TRP in Rel.16, multiple TCI states may be set / indicated per PDSCH.

[0138] One or two TCI states may be activated for each TCI codepoint by the MAC CE of Rel.16 (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE), and one TCI codepoint may be indicated by the DCI (TCI field).

[0139] If the TCI present in DCI parameter (tci-PresentInDCI) is not set or if the time offset (scheduling offset) from the DCI to the PDSCH is less than a threshold (timeDurationForQCL), the UE may operate (e.g., receive PDSCH) using at least one TCI state (default TCI state) from the following TCI states 1 to 3.

[0140] [TCI Status 1] The TCI state corresponds to the lowest TCI codepoint that has two active TCI states (as in Rel.16).

[0141] In the example of Figure 10A, multiple TCI states are configured by RRC, and a TCI state for each codepoint in the TCI field is activated by MAC CE (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE). In the example of Figure 10B, DCI schedules PDSCH1 from TRP#1 and PDSCH from TRP#2. If the time offset between DCI and PDSCH1 and 2 is less than a threshold (timeDurationForQCL), the UE uses the two active TCI states (T0 and T1) for the lowest codepoint (001) among the TCI codepoints with two active TCI states for receiving PDSCH1 and 2, respectively.

[0142] [TCI Status 2] The TCI state is one or two active TCI states corresponding to the lowest TCI codepoint.

[0143] [TCI Status 3] The TCI state corresponds to two active TCI state IDs (the two active TCI state IDs that contain the lowest TCI state ID among the two active TCI states).

[0144] To operate the default TCI state for the PDSCH in the HST, the UE may assume that multiple TCI states are activated for at least one TCI codepoint. For example, in the above-mentioned TCI state 3, two TCI states may always be activated for at least one TCI codepoint.

[0145] For a PDSCH scheduled by a DCI format in which the TCI field is not present (or the TCI field cannot be set) (e.g., DCI format 1_0), the UE may assume one of the following assumptions 1 and 2.

[0146] [Assumption 1] The UE assumes a single TRP.

[0147] [Assumption 2] The UE assumes the HST scheme (Scheme 1 / Scheme 2 / NW pre-compensation scheme). The TCI state in this case may be the default TCI state mentioned above.

[0148] <<Aspect 4-2>> If any of the HST schemes (Scheme 1 / Scheme 2 / NW pre-compensation scheme) is configured / applied, the UE shall assume one TCI state / QCL / spatial relationship / SRI for SRS / PUCCH / PUSCH transmission.

[0149] One TCI state / QCL / spatial relationship / SRI may be configured per SRS / PUCCH / PUSCH resource by the RRC information element / MAC CE / DCI.

[0150] If the spatial relationship is not set, the spatial relationship may follow the following procedure. [procedure] The UE may assume the TCI state with the lowest CORESET ID for CCs with CORESET configured, and may assume the TCI state with the lowest active TCI state ID among the PDSCH TCI states for CCs where CORESET is not configured (similar to Rel. 16).

[0151] The aforementioned "lowest active TCI state ID of a PDSCH TCI state" may be one or two active TCI states. If the "lowest active TCI state ID of a PDSCH TCI state" is two active TCI states, the UE may determine one TCI state to be used for the spatial relationship / PL-RS according to a rule. For example, the one TCI state may be the first configured TCI state, or may be the TCI state with the lower TCI state ID among the two TCI states.

[0152] If multiple TCI states are configurable for a CORESET, the aforementioned "TCI state of the lowest CORESET ID" may be one or two active TCI states. If the "TCI state of the lowest CORESET ID" is one or two active TCI states, the UE may determine one TCI state to be used for the spatial relationship / PL-RS according to a rule. For example, this one TCI state may be the first configured TCI state, or may be the TCI state with the lower TCI state ID among the two TCI states.

[0153] According to this embodiment, the UE can properly determine the DL / UL TCI status.

[0154] <Other embodiments> A higher layer parameter (RRC IE) / UE capability corresponding to a function (feature) in at least one of the above embodiments may be defined. The UE capability may indicate that the function is supported.

[0155] A UE in which a higher layer parameter corresponding to the function (enabling the function) is configured may perform the function. It may be specified that "a UE in which a higher layer parameter corresponding to the function is not configured shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0156] A UE that reports a UE capability indicating that it supports the function may perform the function. It may be specified that "a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0157] If the UE reports a UE capability indicating that the UE supports the function and a corresponding higher layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that the UE supports the function or if a corresponding higher layer parameter is not configured, the UE shall not perform the function (e.g., in accordance with Rel.15 / 16)."

[0158] The UE capability may indicate whether the UE supports this feature.

[0159] The UE capability may indicate whether or not it supports HST (HST scheme).

[0160] The UE capability may indicate whether it supports Scheme 1 / Scheme 2 / NW pre-compensation scheme.

[0161] The UE capability may indicate the maximum number of QCLs that may be configured for the same DMRS port.

[0162] In at least one of the above multiple embodiments, the maximum number of QCLs set for the same DMRS port may be 2. In the specifications, the maximum number of QCLs set for the same DMRS port may be more than 2.

[0163] Scheme 1 / scheme 2 / NW pre-compensation scheme may be defined in the specifications, and the scheme may be indicated / switched by RRC information element / MAC CE / DCI.

[0164] According to the above embodiment, the UE can realize the above functions while maintaining compatibility with existing specifications.

[0165] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0166] 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0167] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). 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.

[0168] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN) and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0169] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0170] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0171] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0172] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The 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 above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0173] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0174] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station 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.

[0175] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0176] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0177] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) 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.

[0178] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0179] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0180] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0181] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0182] 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.

[0183] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0184] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0185] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0186] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0187] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0188] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0189] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0190] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0191] (base station) 12 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 transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0192] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0193] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0194] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0195] The transceiver 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 transceiver unit 120 may be configured with 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 common understanding in the technical field related to the present disclosure.

[0196] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0197] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0198] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0199] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0200] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0201] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), 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 string to be transmitted, and output a baseband signal.

[0202] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0203] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0204] The transceiver 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 to the acquired baseband signal, thereby acquiring user data, etc.

[0205] The transceiver 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.

[0206] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0207] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0208] The controller 110 may determine downlink control information for scheduling a physical downlink shared channel. The transceiver unit 120 may transmit the downlink control information based on whether a high speed mobility scheme is applied to the physical downlink shared channel.

[0209] (User terminal) 13 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230.

[0210] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0211] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0212] 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.

[0213] The transmitting / receiving 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 transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0214] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0215] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0216] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0217] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0218] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0219] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), 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.

[0220] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0221] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0222] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0223] The transceiver 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 to the acquired baseband signal, and acquire user data, etc.

[0224] The transceiver 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.

[0225] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0226] The transceiver 220 may receive downlink control information (DCI, PDCCH) for scheduling a physical downlink shared channel (PDSCH). The controller 210 may determine whether a high speed mobile scheme (HST scheme) is applied to the physical downlink shared channel based on the downlink control information.

[0227] If the downlink control information indicates different transmission configuration indication (TCI) states, the control unit 210 may determine that the high speed mobility scheme is applied to the physical downlink shared channel (first / second embodiment).

[0228] The control unit 210 may determine, based on the downlink control information, whether the Doppler shift of the physical downlink shared channel is pre-compensated (a NW pre-compensation scheme is applied to the PDSCH) (third embodiment).

[0229] When the high speed movement scheme is applied to the physical downlink shared channel, if the downlink control information does not include a TCI field or if the time offset from the downlink control information to the physical downlink shared channel is smaller than a threshold, the control unit 210 may determine the TCI state of the physical downlink shared channel based on at least one of a specific TCI codepoint and a specific TCI state ID (fourth embodiment).

[0230] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0231] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0232] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0233] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0234] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0235] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0236] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0237] Moreover, the processor 1001 reads out programs (program codes), software modules, 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 the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0238] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0239] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0240] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0241] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0242] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0243] Furthermore, 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), a field programmable gate array (FPGA), etc., 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 pieces of hardware.

[0244] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0245] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0246] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0247] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0248] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0249] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0250] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, 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, minislot, etc., instead of a subframe.

[0251] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0252] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0253] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0254] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0255] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0256] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0257] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0258] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0259] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0260] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0261] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0262] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0263] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols 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, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0264] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0265] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0266] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0267] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0268] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0269] 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 performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0270] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0271] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0272] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0273] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0274] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0275] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0276] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit 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," and the like may be used interchangeably.

[0277] In this 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. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0278] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0279] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0280] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0281] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may 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.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. 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.

[0282] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to 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 called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be read as a sidelink channel.

[0283] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0284] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0285] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0286] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including 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) (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 The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0287] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0288] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0289] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0290] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0291] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0292] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0293] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0294] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0295] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0296] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0297] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0298] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0299] Although the invention according to the present disclosure has been described in detail above, it is clear 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 as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

[0300] This application is based on Japanese Patent Application No. 2021-015942, filed on February 3, 2021, the contents of which are incorporated herein in their entirety.

Claims

1. a receiving unit for receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); A terminal having a control unit that controls the PDSCH to be received using a high-speed movement scheme when the DCI is received in a UE-specific search space (USS) set, and controls the PDSCH to be received using a single Transmission / Reception Point (TRP) when the DCI is received in a common search space (CSS) set.

2. receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH); A wireless communication method for a terminal, comprising the steps of: controlling the PDSCH to be received using a high-speed movement scheme when the DCI is received in a UE-specific search space (USS) set; and controlling the PDSCH to be received using a single Transmission / Reception Point (TRP) when the DCI is received in a common search space (CSS) set.

3. a transmitter for transmitting downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); A base station having a control unit that controls the transmission of the PDSCH using a high-speed movement scheme when the DCI is transmitted in a UE-specific search space (USS) set, and controls the transmission of the PDSCH using a single Transmission / Reception Point (TRP) when the DCI is transmitted in a common search space (CSS) set.

4. A system having a terminal and a base station, The terminal includes: a receiving unit for receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); A control unit that controls the PDSCH to be received by a high speed movement scheme when the DCI is received in a UE specific search space (USS) set, and controls the PDSCH to be received by a single Transmission / Reception Point (TRP) when the DCI is received in a common search space (CSS) set, The base station, A system comprising a transmitter for transmitting the DCI.

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