Terminal, wireless communication method, base station and system

Abstract

The present invention properly performs communication even when performing communication using a plurality of transmission points. A terminal according to an aspect disclosed herein comprises: a receiving unit that receives a downlink control channel for instructing transmission of a random access channel for at least one among a serving cell and a non-serving cell; and a control unit that, when transmission of the random access channel is being performed on the basis of the downlink control channel, controls the transmission of the random access channel on the basis of at least one among a random access channel setting corresponding to a predetermined cell and power information about a synchronization signal block corresponding to the predetermined cell.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than 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.

[0004] 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

[0005] In future wireless communication systems (e.g., wireless communication systems after Rel. 16 / 5G), it is expected that communications will be controlled based on inter-cell mobility including non-serving cells, or inter-cell mobility using multiple transmission / reception points (e.g., Multi-TRP (MTRP)).

[0006] However, when UL transmission is performed to multiple transmission / reception points, how to control the UL transmission (for example, the setting information / transmission parameters to be used) becomes an issue. If the UL transmission to each transmission / reception point is not appropriately controlled, the quality of communication using multiple transmission / reception points may deteriorate.

[0007] The present disclosure has been made in consideration of such points, and one of its objectives is to provide a terminal, a wireless communication method, and a base station that are capable of communicating appropriately even when communicating using multiple transmission points.

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives a downlink control channel that instructs transmission of a random access channel to at least one of a serving cell and a non-serving cell, and a control unit that, when transmitting the random access channel based on the downlink control channel, controls transmission of the random access channel based on at least one of a random access channel setting corresponding to a specific cell and power information related to a synchronization signal block corresponding to the specific cell.

[0009] According to one aspect of the present disclosure, communication can be performed appropriately even when communication is performed using multiple transmission points.

[0010] 1A and 1B are diagrams illustrating an example of inter-cell mobility. FIGS. 2A and 2B are diagrams illustrating an example of PRACH transmission control according to a first aspect. FIG. 3 is a diagram illustrating another example of PRACH transmission control according to the first aspect. FIGS. 4A and 4B are diagrams illustrating an example of PRACH transmission control according to a second aspect. FIG. 5 is a diagram illustrating another example of PRACH transmission control according to the second aspect. FIG. 6 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 7 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 8 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 9 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment.

[0011] (TCI, spatial relationship, QCL) In NR, it is considered to control the 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, and the equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

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

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

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

[0016] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be referred to as 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 has 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 assumption of the signal / channel.

[0019] The TCI state may be, for example, information about the QCL between 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 thereof.

[0020] In the present disclosure, 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.

[0021] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0022] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0023] The channel / signal to which the TCI state is applied may be called a target channel / reference signal (target channel / RS), or simply a target, and the other signal may be called a reference reference signal (reference RS), a source RS, or simply a reference.

[0024] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH).

[0025] Furthermore, the RS that has a QCL relationship with the channel may be at least one of, for example, 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)), a QCL detection reference signal (also called a QRS), a demodulation reference signal (DMRS), etc.

[0026] 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 also be referred to as an SS / PBCH block.

[0027] 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 (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0028] (Inter-cell mobility) In NR, one or more transmission / reception points (Transmission / Reception Points (TRPs)) (multi-TRPs (MTRPs)) are considered to perform DL transmission to a UE. Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0029] During inter-cell mobility (e.g., L1 / L2 inter cell mobility), a UE may receive channels / signals from multiple cells / TRPs (see Figures 1A and 1B).

[0030] 1A shows an example of inter-cell mobility (e.g., single-TRP inter-cell mobility) including a non-serving cell. Here, a UE receives channels / signals from the base station / TRP of cell #1, which is the serving cell, and the base station / TRP of cell #3, which is not the serving cell (non-serving cell). For example, this corresponds to a case where the UE switches / switches from cell #1 to cell #3 (e.g., a fast cell switch).

[0031] In this case, the TCI status may be updated by the DCI / MAC CE, and the port (e.g., antenna port) / TRP selection may be performed dynamically. Different physical cell IDs (e.g., PCI) are configured for cell #1 and cell #3.

[0032] Figure 1B shows an example of a multi-TRP scenario (e.g., multi-TRP inter-cell mobility) where a UE receives channels / signals from TRP#1 and TRP#2. Here, TRP#1 is in cell#1 (PCI#1) and TRP#2 is in cell#2 (PCI#2).

[0033] The multi-TRPs (TRPs #1 and #2) may be connected via an 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. As shown in FIG. 1B, non-coherent joint transmission (NCJT) may be used as one form of multi-TRP transmission. This example illustrates a case where NCJT is performed between multiple cells (e.g., cells with different PCIs). Note that the same serving cell configuration may be applied / configured to TRPs #1 and #2.

[0034] In the NCJT, for example, TRP#1 modulates and layer-maps a first codeword to transmit a first signal / channel (e.g., PDSCH) using a first number of layers (e.g., two layers) with a first precoding, and TRP#2 modulates and layer-maps a second codeword to transmit a second signal / channel (e.g., PDSCH) using a second number of layers (e.g., two layers) with a second precoding.

[0035] Multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in time and / or frequency domain, i.e., a first PDSCH from TRP#1 and a second PDSCH from TRP#2 may overlap in time and / or frequency resources.

[0036] 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).

[0037] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode). One DCI may be transmitted from one TRP of a multi-TRP. A configuration using one DCI in a multi-TRP may be referred to as single DCI-based multi-TRP (mTRP / MTRP).

[0038] Multiple PDSCHs from a multi-TRP may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCHs (multiple PDCCHs)), respectively (multiple master mode). Multiple DCIs may be transmitted from multiple TRPs, respectively. A configuration that utilizes multiple DCIs in a multi-TRP may be referred to as a multi-DCI-based multi-TRP (mTRP / MTRP).

[0039] It may be assumed that the UE transmits separate CSI reports (CSI reports) for different TRPs. Such CSI feedback may be referred to as separate feedback, separate CSI feedback, etc. In this disclosure, "separate" may be interchangeably read as "independent."

[0040] As shown in Figure 1, when multiple TRPs are used, the distance between the UE and each TRP may be different. For example, if one TRP corresponds to a serving cell and another TRP corresponds to a non-serving cell, the distance between each TRP and the UE may be different.

[0041] In existing systems, the transmission timing of an uplink (UL) channel and / or an UL signal (UL channel / signal) is adjusted by a timing advance (TA). The reception timing of the UL channel / signal from different user terminals (UE) is adjusted by a radio base station (TRP: Transmission and Reception Point, also referred to as gNodeB: gNB) side.

[0042] In at least one of inter-cell mobility including non-serving cells and multi-TRP scenarios, the issue arises as to how to control UL transmission timing adjustments (e.g., setting / adjusting timing advance).

[0043] For example, how to support different timing advances (eg, TA) for serving and non-serving cells is an issue.

[0044] In addition, it is also possible to perform PRACH transmission using a PDCCH order to measure the timing advance for a serving cell / non-serving cell. In such a case, how to control PRACH transmission (or timing advance measurement using the PRACH) becomes an issue.

[0045] For example, when a PRACH is triggered by a PDCCH order, the UE faces a problem of how to control the transmission conditions (e.g., PRACH settings / transmission power) applied to the PRACH transmission triggered by the PDCCH order (or the triggering of the PRACH).

[0046] The present inventors have studied UL transmission timing control for multiple cells (for example, serving cell / non-serving cells) and have come up with the idea for this embodiment.

[0047] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Each aspect may be applied alone or in combination.

[0048] In the present disclosure, "A / B" may mean "at least one of A and B," and "A / B / C" may mean "at least one of A, B, and C."

[0049] In the present disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc. may be read interchangeably.

[0050] In the present disclosure, RRC, RRC parameters, RRC messages, higher layer parameters, information elements (IEs), and configurations may be interchangeable. In the present disclosure, MAC CE, update commands, and activation / deactivation commands may be interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be interchangeable.

[0051] Additionally, in the present disclosure, the terms sequence, list, set, group, and group may be read interchangeably.

[0052] In the present disclosure, the terms panel, beam, panel group, beam group, Uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, control resource set (CONTROLLER RESOLUTION SET (CORESET)), Physical Downlink Shared Channel (PDSCH), codeword, base station, predetermined antenna port (e.g., Demodulation Reference Signal (DMRS) port), predetermined antenna port group (e.g., DMRS port group), predetermined group (e.g., Code Division Multiplexing (CDM) group, predetermined reference signal group, CORESET group), predetermined resource (e.g., predetermined reference signal resource), predetermined resource set (e.g., predetermined reference signal resource set), CORESET pool, PUCCH group (PUCCH resource group), spatial relationship group, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, ... state), etc. may be read interchangeably.

[0053] 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.

[0054] Furthermore, the panel identifier (ID) and the panel may be interchangeable. That is, the TRP ID and the TRP, the CORESET group ID and the CORESET group, etc. may be interchangeable.

[0055] In this disclosure, the terms index, ID, indicator, and resource ID may be interchangeable. In this disclosure, the terms sequence, list, set, group, cluster, and subset may be interchangeable.

[0056] In the present disclosure, a UE configured with multiple TRPs may determine at least one of the TRPs corresponding to a DCI, the TRP corresponding to a PDSCH or UL transmission (PUCCH, PUSCH, SRS, etc.) scheduled by the DCI, etc., based on at least one of the following: - Value of a predetermined field included in the DCI (e.g., a field specifying the TRP, an antenna port field, a PRI); - DMRS corresponding to the scheduled PDSCH / PUSCH (e.g., the sequence, resource, CDM group, DMRS port, DMRS port group, antenna port group, etc. of the DMRS); - DMRS corresponding to the PDCCH on which the DCI was transmitted (e.g., the sequence, resource, CDM group, DMRS port, DMRS port group, etc. of the DMRS); - CORESET on which the DCI was received (e.g., the CORESET pool ID of the CORESET, the ID of the CORESET, a scrambling ID (which may be replaced with a sequence ID), resources, etc.). - RSs (e.g., RS related groups) used for TCI states, QCL assumptions, spatial relationship information, etc.

[0057] In the present disclosure, a single PDCCH (DCI) may be referred to as a PDCCH (DCI) of a first scheduling type (e.g., scheduling type A (or type 1)), and a multi-PDCCH (DCI) may be referred to as a PDCCH (DCI) of a second scheduling type (e.g., scheduling type B (or type 2)).

[0058] In the present disclosure, for a single DCI, the i-th TRP (TRP#i) may refer to the i-th TCI state, the i-th CDM group, etc. (i is an integer). For a multi-DCI, the i-th TRP (TRP#i) may refer to the CORESET corresponding to CORESET pool index=i, the i-th TCI state, the i-th CDM group, etc. (i is an integer).

[0059] In this disclosure, a single PDCCH may be assumed to be supported when multiple TRPs utilize an ideal backhaul, and multiple PDCCHs may be assumed to be supported when multiple TRPs utilize a non-ideal backhaul.

[0060] The ideal backhaul may be called DMRS port group type 1, reference signal related group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may be called DMRS port group type 2, reference signal related group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0061] In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be read interchangeably.

[0062] In the present disclosure, single DCI (sDCI), single PDCCH, multi-TRP system based on single DCI, sDCI-based MTRP, and activation of two TCI states on at least one TCI codepoint may be read interchangeably.

[0063] 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 interchangeably.

[0064] The QCL in the present disclosure may be interchangeably read as QCL Type D.

[0065] In the following description, the terms maintaining, adjusting, updating, setting, measuring, calculating, and obtaining the TA may be read interchangeably.

[0066] The configurations shown in the following aspects may be used for PRACH transmission in timing advance measurement when supporting transmission to multiple cells (e.g., a serving cell and a non-serving cell), or may be used for PRACH transmission for purposes other than timing advance measurement.

[0067] (First Aspect) The first aspect describes an example of UE operation when receiving an instruction to transmit a PRACH (for example, PRACH configuration to be applied to PRACH transmission).

[0068] In the present disclosure, the instruction of PRACH transmission may be performed by a PDCCH (or DCI), and the PDCCH instructing PRACH transmission may be referred to as a PDCCH order (e.g., a PDCCH order). Furthermore, a PRACH transmitted based on a PDCCH order may be referred to as a PDCCH-ordered PRACH (e.g., a PDCCH order PRACH).

[0069] The UE transmits the PRACH to at least one of the serving cell and the non-serving cell based on the PDCCH order. The cell from which the PRACH is transmitted may be explicitly indicated / configured by information (e.g., RRC / MAC CE / DCI) notified to the UE from the base station, or may be implicitly indicated / configured. The information notified from the base station may be at least one of predetermined higher layer signaling and the PDCCH order.

[0070] Alternatively, the cell that performs PRACH transmission may not be notified to the UE from the base station, and the UE may control PRACH transmission using a predetermined PRACH setting based on the PDCCH order.

[0071] When a PDCCH instructing PRACH transmission is received, the UE may control the transmission of the PRACH based on at least one of the following options 1-1 to 1-2. For example, the UE may determine at least one of parameters to be used for PRACH transmission, a PRACH setting (e.g., a PRACH configuration), and a PRACH resource setting (e.g., a PRACH resource configuration) based on at least one of the following options 1-1 to 1-2. In the present disclosure, the PRACH setting, the PRACH transmission parameters, and the PRACH resource setting may be interchangeable.

[0072] <Option 1-1> The UE may control the transmission of the PRACH by using a PRACH configuration corresponding to a specific cell, regardless of the cell (e.g., destination cell) to which the PRACH is to be transmitted. For example, when the UE receives a PDCCH order, the UE may control the transmission of the PRACH by using a PRACH configuration corresponding to a specific cell (e.g., serving cell) (see FIG. 2A).

[0073] FIG. 2A illustrates the case where the same / common PRACH configuration is used for PRACH transmissions to the serving cell and PRACH transmissions to the non-serving cells.

[0074] The PRACH configuration corresponding to the serving cell and the PRACH configuration corresponding to the non-serving cell may be the same / common. For example, a PRACH configuration corresponding to a specific cell (e.g., a serving cell) may be configured in the UE from the base station, and the UE may control PRACH transmission using the PRACH configuration configured for the specific cell regardless of the cell transmitting the PRACH. Note that the PRACH configuration may be configured without being associated with a cell, or may be configured for PRACH transmission for a PDCCH order.

[0075] The UE may transmit the PRACH without determining (or being aware of) whether the target cell for PRACH transmission is a serving cell or a non-serving cell. In this case, it is not necessary for the base station to notify the UE of the cell information of the target cell for PRACH transmission.

[0076] The PRACH transmitted from the UE may be configured to be received by either the serving cell or the non-serving cell, or may be configured to be received by both the serving cell and the non-serving cell. The PRACH reception operation may be implemented by the base station.

[0077] The structure of the PDCCH order may be the same as that of existing systems (for example, Rel. 16 and earlier), and the PDCCH order may not be extended.

[0078] Alternatively, the base station may instruct / set information about the cell that is the target of PRACH transmission to the UE. In this case, the base station corresponding to the cell that is the target of PRACH transmission may receive the PRACH.

[0079] The cell (or base station) that transmits the PDCCH order may be a specific cell (e.g., a serving cell), or may be configured not to be limited to a specific cell (e.g., the cell (or base station) that transmits the PDCCH order is not defined in the specifications).

[0080] In this way, when PRACH transmission to a serving cell / non-serving cell is supported, by using a common PRACH setting for the PRACH transmission, it is possible to suppress an increase in the overhead of information set / instructed from the base station to the UE.

[0081] <Option 1-2> The UE may control the PRACH transmission (or the PRACH configuration to be applied) based on the cell (e.g., destination cell) to which the PRACH is to be transmitted. For example, when the UE receives a PDCCH order, the UE may control the PRACH transmission using the PRACH configuration corresponding to the cell to which the PRACH is to be transmitted (see FIG. 2B ).

[0082] 2B illustrates a case in which a first PRACH configuration (e.g., a PRACH configuration corresponding to a serving cell) is used for PRACH (e.g., PDCCH order PRACH) transmission for a first cell (e.g., a serving cell), while a second PRACH configuration (e.g., a PRACH configuration corresponding to a non-serving cell) is used for PRACH (e.g., PDCCH order PRACH) transmission for a second cell (e.g., a non-serving cell).

[0083] A first PRACH setting corresponding to a first cell (e.g., a serving cell) and a second PRACH setting corresponding to a second PRACH setting (e.g., a non-serving cell) may be configured separately by higher layer signaling, etc.

[0084] The PRACH configuration of the existing system (e.g., Rel. 16 and earlier) may be utilized for the serving cell, and in addition to the PRACH configuration, new RRC parameters (e.g., Rel. 17 RRC parameters) may support PRACH configuration for non-serving cells.

[0085] When there are multiple first cells, a common PRACH configuration may be applied / configured to the multiple first cells, or when there are multiple first cells, a PRACH configuration may be applied / configured separately to the multiple first cells.

[0086] When a plurality of second cells exist, a common PRACH configuration may be applied / configured to the plurality of second cells. Alternatively, when a plurality of second cells exist, a PRACH configuration may be applied / configured separately to the plurality of second cells. Note that a common PRACH configuration may be configured for a plurality of first cells, and a separate PRACH configuration may be configured for a plurality of second cells. Alternatively, a separate PRACH configuration may be configured for a plurality of first cells, and a common PRACH configuration may be configured for a plurality of second cells.

[0087] The UE may transmit the PRACH to either the serving cell or a non-serving cell based on the PDCCH order.

[0088] The target cell to which the PRACH configuration to be applied to the PRACH transmission corresponds, or information regarding the target cell of the PRACH transmission, may be explicitly or implicitly indicated from the base station to the UE.

[0089] For example, the target cell may be indicated by a PDCCH order (or DCI). In this case, the configuration of the PDCCH order may be enhanced.

[0090] Alternatively, the target cell may be implicitly indicated to the UE based on parameters corresponding to the PRACH transmission or other signals / channels related to the PRACH transmission (e.g., synchronization signal block (SSB) / PDCCH order).

[0091] For example, the UE may determine the target cell based on at least one of the following options 1-2-1 to 1-2-3.

[0092] <<Option 1-2-1>> The UE may determine the cell to which the PDCCH order (or the PRACH transmitting via the PDCCH order) corresponds based on predetermined parameters used for the PDCCH of the PDCCH order (or other signal / channel related to the PDCCH).

[0093] For example, a quasi-co-location source (e.g., QCL source) of the PDCCH used in the PDCCH order may be used to implicitly indicate to the UE whether the target cell is a serving cell or a non-serving cell, in which case the target cell can be indicated to the UE without extending the PDCCH order.

[0094] When a PDCCH order (e.g., PDCCH / DCI) is a QCL with a serving cell, the UE may control to transmit a PRACH (e.g., PDCCH ordered PRACH) whose transmission is instructed by the PDCCH order to the serving cell. In this case, the UE may apply a PRACH configuration associated with the serving cell to the PRACH transmission.

[0095] When a PDCCH order (e.g., PDCCH / DCI / CORESET) is in QCL with a non-serving cell, the UE may control the transmission of a PRACH (e.g., PDCCH ordered PRACH) instructed by the PDCCH order to the non-serving cell. In this case, the UE may apply a PRACH configuration associated with the non-serving cell to the PRACH transmission.

[0096] 3 illustrates a case where a synchronization signal block / CSI-RS transmitted by a non-serving cell (here, cell #1) and a PDCCH order (PDCCH / DCI / CORESET) transmitted by a serving cell are QCL. In this case, the UE may determine that PRACH transmission for the non-serving cell #1 is triggered by the PDCCH order.

[0097] The non-serving cell #1 may be configured / designated as a non-serving cell (PCI #1) or may be configured / designated as a different / additional / another PCI #1.

[0098] In this way, by implicitly notifying the UE of the target cell, it becomes unnecessary to explicitly indicate the target cell by the PDCCH order, which makes it possible to suppress an increase in overhead of the PDCCH order.

[0099] Alternatively, the predetermined parameter may be, for example, a TCI state.

[0100] For example, if a base station transmits a PDCCH order for a PRACH and the PDCCH (or DCI / CORESET) is associated with a TCI status from a non-serving cell, the PRACH requested by the PDCCH order may correspond to the non-serving cell. In this case, the UE may control the PRACH transmission based on the PRACH configuration of the non-serving cell. The UE may then determine the TA of the non-serving cell based on a DL transmission (e.g., RAR) fed back for the PRACH transmission.

[0101] If the PDCCH (or DCI / CORESET) is associated with the TCI status from a serving cell, the PRACH requested by the PDCCH order may correspond to the serving cell. In this case, the UE may control the PRACH transmission based on the PRACH configuration of the serving cell. The UE may then determine the TA of the serving cell based on the DL transmission (e.g., RAR) fed back for the PRACH transmission.

[0102] <<Option 1-2-2>> The UE may determine the cell to which the PDCCH order (or the PRACH transmitted by the PDCCH order) corresponds based on the DCI (or CORESET) used in the PDCCH order.

[0103] For example, the DCI used in the PDCCH order may include identification information of the cell corresponding to the PRACH (e.g., cell index / cell type (e.g., serving cell / non-serving cell)) and notify the UE. In a predetermined DCI format (e.g., DCI format 1_0) used in the PDCCH order, X reserved bits of the DCI may be used for cell notification to explicitly indicate the serving cell / non-serving cell corresponding to the PRACH. The reserved bits may be the reserved bits included in DCI format 1_0 in the existing system (e.g., Rel. 15 / 16).

[0104] The bit size of X may be set / determined / determined based on the number of configured non-serving cells. For example, if one non-serving cell is configured, X may be 1 bit. The field used to notify the cell identity information may be the most significant bit (MSB) or the least significant bit (LSB) of the reserved bits.

[0105] Alternatively, if three non-serving cells are configured, X may be two bits. To indicate a non-serving cell, a re-indexed non-serving cell index may be applied. The association between the cell index and the bit value (or code point) may be defined in a specification or may be configured by higher layer signaling, etc. For example, code point '0' or '00' may indicate the serving cell, and the remaining bits may be associated with the index order (e.g., ascending / descending order) of the configured non-serving cells.

[0106] Alternatively, the size of X may be fixed, and the number of bits may not change regardless of the number of configured non-serving cells. In this case, unused bits / fields may be configured as reserved bits.

[0107] <<Option 1-2-3>> If the random access preamble index (e.g., ra-PreambleIndex) is a predetermined value (e.g., 0 to 63), a part of the preamble may be configured / activated by the RRC / MAC CE to be associated with a non-serving cell.

[0108] In this case, information on the serving cell / non-serving cell may be indicated by a predetermined field in a predetermined DCI format (e.g., DCI format 1_0). The predetermined field may be, for example, a random access preamble index field. Note that the preamble configuration related to the non-serving cell may be configured to be applied only to PRACH transmission based on the PDCCH order (or may not be applied to collision-based PRACH transmission).

[0109] If the DCI indicates a preamble associated with a non-serving cell, the UE may control the PRACH transmission with the indicated preamble according to the RACH configuration of the non-serving cell.

[0110] The UE may adjust the TA of one or more indicated cells after the PRACH based on the PDCCH order. Information about the TA may be received in a response signal (e.g., RAR) to the PRACH transmission.

[0111] (Second Aspect) The second aspect describes another example of UE operation (for example, reception power to apply to PRACH transmission) when an instruction for PRACH transmission is received.

[0112] In existing systems (e.g., before Rel. 16), when the PRACH is triggered by a PDCCH order, the transmit power of the PRACH (e.g., referenceSignalPower) is determined based on a parameter related to the synchronization signal block (e.g., the higher layer parameter ss-PBCH-BlockPower).

[0113] When a configuration is supported in which PRACH transmission is performed to at least one of a serving cell and a non-serving cell based on a PDCCH order, the question arises as to how to control the transmission power of the PRACH triggered by the PDCCH order.

[0114] In a second aspect, the transmission power of PRACH transmission is controlled based on a predetermined parameter corresponding to a specific cell (e.g., a parameter / ss-PBCH-BlockPower related to a synchronization signal block) or a predetermined parameter corresponding to a cell that performs PRACH transmission. The parameter / ss-PBCH-BlockPower related to a synchronization signal block may be the average power (Energy Per Resource Element (EPRE)) of a resource element that transmits a secondary synchronization signal used by a network (e.g., a base station) for SSB transmission. The parameter / ss-PBCH-BlockPower related to a synchronization signal block may be notified / configured to a UE by higher layer signaling.

[0115] When a UE receives a PDCCH instructing PRACH transmission, the UE may control the transmission of the PRACH based on at least one of the following options 2-1 to 2-2.

[0116] <Option 2-1> The UE may control the transmission power of the PRACH by using a predetermined parameter (e.g., a parameter related to a synchronization signal block / ss-PBCH-BlockPower) corresponding to a specific cell, regardless of the cell (e.g., destination cell) that is the target of PRACH transmission. The predetermined parameter, the predetermined power parameter, and the predetermined power information may be interpreted as interchangeable terms.

[0117] For example, when the UE receives a PDCCH order, the UE may control the transmission power of the PRACH using a predetermined power parameter corresponding to a specific cell (e.g., a serving cell) (see FIG. 4A ). FIG. 4A illustrates a case where the same / common predetermined power parameter is used for PRACH transmission to the serving cell and PRACH transmission to the non-serving cell.

[0118] The predetermined power parameters corresponding to the serving cell and the predetermined power parameters corresponding to the non-serving cells may be the same / common. For example, the base station may configure the UE with predetermined power parameters corresponding to a specific cell (e.g., a serving cell), and the UE may control the transmission power of the PRACH using the predetermined power parameters configured for the specific cell, regardless of the cell transmitting the PRACH. Note that the predetermined power parameters may be configured without being associated with a cell, or may be configured for PRACH transmission in response to a PDCCH order.

[0119] The UE may control the transmission power of the PRACH without determining (or being aware of) whether the target cell for PRACH transmission is a serving cell or a non-serving cell. In this case, it is not necessary for the base station to notify the UE of cell information about the target cell for PRACH transmission.

[0120] The structure of the PDCCH order may be the same as that of existing systems (for example, Rel. 16 and earlier), and the PDCCH order may not be extended.

[0121] In this way, when PRACH transmission to a serving cell / non-serving cell is supported, by using common predetermined power parameters for the PRACH transmission, it is possible to suppress an increase in the overhead of information set / instructed from the base station to the UE.

[0122] <Option 2-2> The UE may control the transmission of the PRACH (or the transmission power to be applied) based on the cell (e.g., destination cell) that is the target of the PRACH transmission. For example, when the UE receives a PDCCH order, the UE may control the transmission power of the PRACH by using a predetermined power parameter (e.g., a parameter related to a synchronization signal block / ss-PBCH-BlockPower) that corresponds to the cell that is the target of the PRACH transmission (see FIG. 4B ).

[0123] 4B illustrates a case in which a first predetermined power parameter (e.g., a predetermined power parameter corresponding to a serving cell) is used for PRACH (e.g., PDCCH order PRACH) transmission for a first cell (e.g., a serving cell), while a second predetermined power parameter (e.g., a predetermined power parameter corresponding to a non-serving cell) is used for PRACH (e.g., PDCCH order PRACH) transmission for a second cell (e.g., a non-serving cell).

[0124] The first predetermined power parameter corresponding to the first cell (e.g., the serving cell) and the second predetermined power parameter corresponding to the second PRACH configuration (e.g., the non-serving cell) may be configured separately by higher layer signaling, etc.

[0125] In addition to the pre-defined power parameters of the existing system (e.g., Rel. 16 and earlier) being utilized for the serving cell, new RRC parameters (e.g., Rel. 17 RRC parameters) may support pre-defined power parameters for non-serving cells (e.g., ss-PBCH-BlockPower config).

[0126] When there are multiple first cells, a common predetermined power parameter may be applied / set to the multiple first cells, or when there are multiple first cells, a predetermined power parameter may be applied / set separately to the multiple first cells.

[0127] When a plurality of second cells exist, a common predetermined power parameter may be applied / set to the plurality of second cells. Alternatively, when a plurality of second cells exist, a predetermined power parameter may be applied / set separately to the plurality of second cells. Note that a common predetermined power parameter may be set to a plurality of first cells, and a predetermined power parameter may be set separately to a plurality of second cells. Alternatively, a common predetermined power parameter may be set to a plurality of first cells, and a predetermined power parameter may be set to a plurality of second cells.

[0128] The UE may transmit the PRACH to either the serving cell or a non-serving cell based on the PDCCH order.

[0129] The target cell to which the PRACH configuration to be applied to the PRACH transmission corresponds, or information regarding the target cell of the PRACH transmission, may be explicitly or implicitly indicated from the base station to the UE.

[0130] For example, the target cell may be indicated by a PDCCH order (or DCI). In this case, the configuration of the PDCCH order may be enhanced.

[0131] Alternatively, the target cell may be implicitly indicated to the UE based on parameters corresponding to the PRACH transmission or other signals / channels related to the PRACH transmission (e.g., synchronization signal block (SSB) / PDCCH order).

[0132] For example, the UE may determine the target cell based on at least one of the following options 2-2-1 to 2-2-3.

[0133] <<Option 2-2-1>> The UE may determine the cell to which the PDCCH order (or the PRACH transmitting via the PDCCH order) corresponds based on predetermined parameters used for the PDCCH of the PDCCH order (or other signal / channel related to the PDCCH).

[0134] For example, a quasi-co-location source (e.g., QCL source) of the PDCCH used in the PDCCH order may be used to implicitly indicate to the UE whether the target cell is a serving cell or a non-serving cell, in which case the target cell can be indicated to the UE without extending the PDCCH order.

[0135] When a PDCCH order (e.g., PDCCH / DCI) is a QCL with a serving cell, the UE may control a PRACH (e.g., PDCCH ordered PRACH) whose transmission is instructed by the PDCCH order to be transmitted to the serving cell. In this case, the UE may apply a predetermined power parameter associated with the serving cell to the PRACH transmission.

[0136] When a PDCCH order (e.g., PDCCH / DCI / CORESET) is in QCL with a non-serving cell, the UE may control the transmission of a PRACH (e.g., PDCCH ordered PRACH) instructed by the PDCCH order to the non-serving cell. In this case, the UE may apply a predetermined power parameter associated with the non-serving cell to the PRACH transmission.

[0137] 5 illustrates a case where a synchronization signal block / CSI-RS transmitted by a non-serving cell (here, cell #1) and a PDCCH order (PDCCH / DCI / CORESET) transmitted by the serving cell are QCL. In this case, the UE may determine that PRACH transmission for the non-serving cell #1 is triggered by the PDCCH order and determine the transmission power of the PRACH based on a predetermined power parameter corresponding to the non-serving cell #1.

[0138] The non-serving cell #1 may be configured / designated as a non-serving cell (PCI #1) or may be configured / designated as a different / additional / another PCI #1.

[0139] In this way, by implicitly notifying the UE of the target cell, it becomes unnecessary to explicitly indicate the target cell by the PDCCH order, which makes it possible to suppress an increase in overhead of the PDCCH order.

[0140] Alternatively, the predetermined parameter may be, for example, a TCI state.

[0141] For example, if a base station transmits a PDCCH order for a PRACH and the PDCCH (or DCI / CORESET) is associated with a TCI status from a non-serving cell, the PRACH requested by the PDCCH order may correspond to the non-serving cell. In this case, the UE may control the PRACH transmission based on a predetermined power parameter of the non-serving cell. The UE may then determine the TA of the non-serving cell based on a DL transmission (e.g., RAR) fed back for the PRACH transmission.

[0142] If the PDCCH (or DCI / CORESET) is associated with a TCI status from a serving cell, the PRACH requested by the PDCCH order may correspond to the serving cell. In this case, the UE may control the transmission of the PRACH based on the predetermined power parameters of the serving cell. The UE may then determine the TA of the serving cell based on the DL transmission (e.g., RAR) fed back for the PRACH transmission.

[0143] <<Option 2-2-2>> The UE may determine the cell corresponding to the PDCCH order (or the PRACH transmitted by the PDCCH order) based on the DCI (or CORESET) used in the PDCCH order. The specific operation may be the same as that of Option 1-2-2 described above.

[0144] <<Option 2-2-3>> When the random access preamble index (e.g., ra-PreambleIndex) is a predetermined value (e.g., 0 to 63), a part of the preamble may be configured / activated by the RRC / MAC CE to be associated with a non-serving cell. The specific operation may be the same as that of Option 1-2-3 described above.

[0145] (Third Aspect) The third aspect describes a quasi-co-location assumption (eg, QCL assumption) for a PRACH triggered by a PDCCH order (eg, a PRACH of message 1).

[0146] When PRACH transmission is performed by a PDCCH order, a response signal (PDSCH including RAR) and DCI (for example, DCI format 1_0) that schedules the response signal are transmitted in response to the PRACH transmission.

[0147] In existing systems (e.g., Rel. 16), it is specified that a PDCCH (e.g., a PDCCH including DCI format 1_0) that schedules a PDSCH including an RAR and a PDCCH order are quasi-colocated (e.g., have the same DMRS antenna port quasi-colocation characteristics). It is also specified that a PDSCH (e.g., a PDSCH including an RAR) scheduled on the PDCCH and a PDCCH order are quasi-colocated.

[0148] On the other hand, in the existing system, there is no provision for how to assume the QCL of the PRACH of message 1, which corresponds to the PRACH triggered by the PDCCH order.

[0149] In the third aspect, at least one of the following options 3-1 to 3-2 is applied as a QCL assumption when a configuration in which PRACH transmission triggered by a PRACH order is performed to at least one of a serving cell and a non-serving cell is supported.

[0150] <Option 3-1> For the PRACH of a PDCCH order for a serving cell / non-serving cell, a QCL assumption / spatial relation (for example, a QCL assumption / spatial relation) with at least one predetermined signal / channel may be specified / configured.

[0151] The predetermined signal / channel may be at least one of the PRACH of message 1, the DCI scheduling the RAR (or the PDSCH including the RAR), the PDSCH including the RAR, the PUSCH of message 3, and message 4.

[0152] The PRACH of message 1 may be any PRACH other than the PRACH triggered by the PDCCH order, for example, a PRACH transmitted in a collision-based PRACH.

[0153] The DCI that schedules the RAR (or the PDSCH that includes the RAR) may be, for example, a predetermined DCI format (for example, DCI format 1_0) that is CRC scrambled with the RA-RNTI and schedules the PDSCH that includes the RAR.

[0154] The PDSCH including the RAR may be a PDSCH scheduled by a DCI that is CRC scrambled with the RA-RNTI.

[0155] Message 4 may be a PDCCH (or DCI) corresponding to message 4 or a PDSCH corresponding to message 4.

[0156] <Option 3-2> Based on a synchronization signal block associated with a PDCCH order corresponding to a serving cell or a non-serving cell, a QCL relationship / spatial relationship between the PRACH of the PDCCH order and a predetermined signal / channel may be determined / derived.

[0157] For example, if an SSB associated with a PDCCH order corresponds to (e.g., is transmitted from) a serving cell, it may be determined that the PRACH triggered by the PDCCH order and the predetermined signal / channel corresponding to the serving cell are QCLs. Also, if an SSB associated with a PDCCH order corresponds to (e.g., is transmitted from) a non-serving cell, it may be determined that the PRACH triggered by the PDCCH order and the predetermined signal / channel corresponding to the non-serving cell are QCLs.

[0158] The type of cell to which the SSB is associated may be explicitly indicated by the PDCCH order (option 3-2-1) or implicitly indicated by the PDCCH order (option 3-2-2).

[0159] <<Option 3-2-1>> The PDCCH order may explicitly indicate the SSB associated with the serving cell or the SSB associated with the non-serving cell. For example, a predetermined field of the DCI used for the PDCCH order may specify whether the SSB corresponds to the serving cell or the non-serving cell.

[0160] Option 3-2-2: The PDCCH order may implicitly indicate the SSB associated with the serving cell or the SSB associated with the non-serving cell, for example, based on a QCL source reference signal (e.g., QCL source RS) or a root SSB associated with the serving cell or the non-serving cell.

[0161] (UE Capability Information) In the above-described first to third aspects, the following UE capabilities may be configured. Note that the following UE capabilities may be interpreted as parameters (e.g., higher layer parameters) configured in the UE from a network (e.g., a base station).

[0162] UE capability information regarding whether or not at least one of inter cell mobility (e.g., inter cell mobility) and inter cell multi-TRP (e.g., inter cell multi-TRP) is supported may be defined.

[0163] UE capability information regarding whether multiple cell IDs / different cell IDs (e.g., multiple PCIs / different PCIs) are supported may be defined.

[0164] UE capability information regarding whether or not to support PRACH (e.g., PRACH triggered by a PDCCH order) for a non-serving cell (or a different cell ID) may be defined.

[0165] The first to third aspects may be applied to a UE that supports / reports at least one of the above-mentioned UE capabilities, or may be applied to a UE configured by the network.

[0166] (Wireless Communication System) The 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 thereof.

[0167] 6 is a diagram illustrating 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) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0168] The wireless communication system 1 may also support dual connectivity between multiple 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)), etc.

[0169] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0170] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0171] 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 located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 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 base station 10.

[0172] 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 (CCs) and dual connectivity (DC).

[0173] 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 higher than 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 higher frequency band than FR2.

[0174] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0175] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between 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.

[0176] 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, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0177] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0178] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, 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), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0179] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0180] 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 the downlink channel.

[0181] Furthermore, 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)), or the like may be used as an uplink channel.

[0182] 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).

[0183] 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 for at least one of the PDSCH and the PUSCH.

[0184] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0185] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching 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 more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0186] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0187] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0188] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0189] 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.

[0190] 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 an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0191] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0192] 7 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0193] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0194] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from 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.

[0195] 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 transceiver unit 120, the transceiver 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 transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0196] 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.

[0197] 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, the RF unit 122, and a measurement unit 123.

[0198] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0199] 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.

[0200] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0201] The transmitter / receiver unit 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.

[0202] The transmitter / receiver unit 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.

[0203] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0204] 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 band signal received by the transceiver antenna 130.

[0205] 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.

[0206] 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.

[0207] 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), control plane data, etc. for the user terminal 20.

[0208] 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.

[0209] The transceiver 120 may transmit a downlink control channel instructing transmission of a random access channel to at least one of the serving cell and the non-serving cell.

[0210] When a random access channel is transmitted based on a downlink control channel, the control unit 110 may control reception of a random access channel to which at least one of a random access channel setting corresponding to a specified cell and power information related to a synchronization signal block corresponding to the specified cell is applied.

[0211] The control unit 110 may control reception of a random access channel to which at least one of a random access channel setting corresponding to a cell that transmits the random access channel and power information related to a synchronization signal block corresponding to a cell that transmits the random access channel has been applied.

[0212] (User Terminal) Fig. 8 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0213] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0214] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0215] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0216] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be 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.

[0217] 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.

[0218] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0219] 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.

[0220] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0221] 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.

[0222] The transmitter / receiver unit 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 string to be transmitted, and output a baseband signal.

[0223] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0224] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0225] 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 band signal received by the transceiver antenna 230.

[0226] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0227] 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.

[0228] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0229] The transceiver 220 may receive a downlink control channel instructing transmission of a random access channel to at least one of a serving cell and a non-serving cell.

[0230] When transmitting a random access channel based on a downlink control channel, the control unit 210 may control the transmission of the random access channel based on at least one of a random access channel setting corresponding to a specified cell and power information regarding a synchronization signal block corresponding to the specified cell.

[0231] The control unit 210 may control the transmission of the random access channel based on at least one of a random access channel setting corresponding to the cell that transmits the random access channel and power information regarding the synchronization signal block corresponding to the cell that transmits the random access channel.

[0232] The control unit 210 may determine at least one of the cell that transmits the random access channel, the random access channel setting to be applied to the transmission of the random access channel, and the transmission power to be applied to the transmission of the random access channel based on the cell in which the downlink control channel is quasi-colocated.

[0233] The control unit 210 may determine at least one of the signals and channels with which the random access channel is quasi-collocated based on the synchronization signal block associated by the downlink control channel.

[0234] (Hardware Configuration) Note that 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. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0235] 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, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0236] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may 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.

[0237] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used 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.

[0238] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0239] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0240] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as 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), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0241] The processor 1001 also reads 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 in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0242] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0243] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0244] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. 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.

[0245] 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 outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0246] Furthermore, 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.

[0247] 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0248] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present 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 interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0249] 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.

[0250] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0251] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0252] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist 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.

[0253] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to 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 interchangeable.

[0254] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (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.

[0255] Here, TTI refers to, for example, the smallest 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.

[0256] 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) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0257] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0258] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0259] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 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 greater than or equal to 1 ms.

[0260] 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 numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0261] 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 which may be composed of one or more resource blocks.

[0262] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0263] 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.

[0264] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0265] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0266] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given channel / signal outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0267] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. 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, etc. may be changed in various ways.

[0268] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0269] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions 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 intended to be limiting in any way.

[0270] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0271] 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 multiple network nodes.

[0272] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0273] 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.

[0274] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0275] 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).

[0276] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0277] 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.

[0278] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if 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), these wired and / or wireless technologies are included within the definition of transmission media.

[0279] 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).

[0280] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "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," etc. may be used interchangeably.

[0281] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0282] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0283] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0284] 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.

[0285] At least one of the base station and the mobile station may be referred to as 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 mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile 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 also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0286] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments 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 multiple 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, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0287] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0288] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal 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), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0289] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed 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.

[0290] Each aspect / embodiment described in the present disclosure may be a technology other than 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 decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on these and are extended thereto. In addition, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0291] 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."

[0292] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. 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 in some way precede the second element.

[0293] 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, etc.

[0294] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0295] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0296] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0297] 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 elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0298] 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, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0299] 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."

[0300] 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." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0301] In this disclosure, where articles are 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.

[0302] 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 in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

[0303] This application is based on Japanese Patent Application No. 2021-132433, filed on August 16, 2021, the contents of which are incorporated herein in their entirety.

Claims

1. a receiving unit for receiving a downlink control channel (PDCCH) instructing transmission of a random access channel (PRACH) to at least one of a serving cell and a cell different from the serving cell; A control unit that controls transmission of the PRACH based on power information related to a synchronization signal block (SSB) corresponding to a predetermined cell when transmitting the PRACH based on the PDCCH, The control unit determines the PRACH setting to be applied to the transmission of the PRACH based on a cell receiving a channel state information reference signal (CSI-RS) that is a demodulation reference signal of the PDCCH and a quasi-colocation (QCL) and an SSB that is a QCL. A terminal.

2. A terminal as described in claim 1, wherein a cell different from the serving cell is set by a physical cell ID different from that of the serving cell.

3. receiving a downlink control channel (PDCCH) instructing transmission of a random access channel (PRACH) to at least one of a serving cell and a cell different from the serving cell; When transmitting the PRACH based on the PDCCH, controlling transmission of the PRACH based on power information regarding a synchronization signal block (SSB) corresponding to a predetermined cell; A wireless communication method for a terminal, comprising: a step of determining a PRACH setting to be applied to transmitting the PRACH based on a cell that receives a demodulation reference signal for the PDCCH, a channel state information reference signal (CSI-RS) that is a quasi-co-location (QCL), and an SSB that is a QCL.

4. a transmitter that transmits a downlink control channel (PDCCH) instructing transmission of a random access channel (PRACH) to at least one of a serving cell and a cell different from the serving cell; A control unit that controls reception of the PRACH to which power information related to a synchronization signal block (SSB) corresponding to a predetermined cell is applied when the PRACH is transmitted based on the PDCCH, The control unit notifies a PRACH setting to be applied to the transmission of the PRACH based on a cell transmitting a channel state information reference signal (CSI-RS) which is a demodulation reference signal of the PDCCH and a quasi-colocation (QCL) and an SSB which is a QCL. A base station.

5. A system including a terminal and a base station, The terminal a receiving unit for receiving a downlink control channel (PDCCH) instructing transmission of a random access channel (PRACH) to at least one of a serving cell and a cell different from the serving cell; A control unit that controls transmission of the PRACH based on power information related to a synchronization signal block (SSB) corresponding to a predetermined cell when transmitting the PRACH based on the PDCCH, The control unit determines a PRACH configuration to be applied to the transmission of the PRACH based on a cell receiving a demodulation reference signal of the PDCCH, a channel state information reference signal (CSI-RS) which is a quasi-co-location (QCL), and an SSB which is a QCL; The base station A system comprising a transmitter that transmits the PDCCH.