Terminals, wireless communication methods, base stations and systems

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

Technical Field

[0001] This disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system 、 base station and system and is related thereto.

Background Art

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

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] Future wireless communication systems (e.g., wireless communication systems beyond Rel.16 / 5G) are expected to control communication based on inter-cell mobility, including non-serving cells, or inter-cell mobility utilizing multiple transmit / receive points (e.g., Multi-TRP (MTRP)).

[0006] However, when performing UL transmission to multiple transmission / reception points, the issue arises of how to control the UL transmission (e.g., the configuration information / transmission parameters used). If UL transmission to each transmission / reception point is not properly controlled, the quality of communication using multiple transmission / reception points may deteriorate.

[0007] This disclosure is made in view of the above, and describes a terminal and wireless communication method that can properly perform communication even when using multiple transmission points. 、 base station and system One of the objectives is to provide it. [Means for solving the problem]

[0008] A terminal relating to one aspect of this disclosure is a serving cell. 、 and , different from the serving cell Random access channel to at least one cell (PRACH) Downlink control channel that instructs transmission (PDCCH) A receiving unit that receives the above PDCCH Based on the above PRACH When sending , place Synchronization signal block corresponding to constant cell (SSB) Electricity information In the report Based on the above, PRACH A control unit that controls the transmission of and The control unit then determines the PRACH setting to apply to the PRACH transmission based on the PDCCH demodulation reference signal, the channel status information reference signal (CSI-RS) which is a pseudo-collocation (QCL), and the cell that receives the SSB which is a QCL. . [Effects of the Invention]

[0009] According to one aspect of this disclosure, communication can be performed appropriately even when using multiple transmission points. [Brief explanation of the drawing]

[0010] [Figure 1] Figures 1A and 1B show an example of inter-cell mobility. [Figure 2] Figures 2A and 2B show an example of PRACH transmission control according to the first embodiment. [Figure 3] Figure 3 shows another example of PRACH transmission control according to the first embodiment. [Figure 4] Figures 4A and 4B show an example of PRACH transmission control according to the second embodiment. [Figure 5] Figure 5 shows another example of PRACH transmission control according to the second embodiment. [Figure 6] Figure 6 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 7] Figure 7 shows an example of the configuration of a base station according to one embodiment. [Figure 8] Figure 8 shows an example of the configuration of a user terminal according to one embodiment. [Figure 9] Figure 9 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Modes for carrying out the invention]

[0011] (TCI, spatial relations, QCL) In NR, it is being considered to control at least one of the signal and the channel (referred to as signal / channel) in a UE, such as 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) based on a Transmission Configuration Indication state (TCI state).

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

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

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

[0015] The spatial reception parameters may correspond to the UE's received beam (e.g., the received analog beam), and the beam may be identified based on the spatial QCL. In this disclosure, QCL (or at least one element of QCL) may be interpreted as sQCL (spatial QCL).

[0016] QCL may have multiple types (QCL types). For example, there may be four QCL types A and D that differ in the parameters (or parameter sets) that can be assumed to be the same, and these parameters (which may also be called QCL parameters) are shown below: • 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 assumption by the UE that one control resource set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be called a QCL assumption.

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

[0019] The TCI state may, for example, be information regarding the QCL between the target channel (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 upper-layer signaling, physical layer signaling, or a combination thereof.

[0020] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0021] MAC signaling may use, for example, MAC Control Elements (MAC CEs) or MAC Protocol Data Units (PDUs). Broadcast information may also include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), or Other System Information (OSIs).

[0022] Physical layer signaling may include, for example, Downlink Control Information (DCI).

[0023] The channel / signal to which the TCI status applies may also be called the target channel / reference signal (target channel / RS), or simply the target, while the other signal mentioned above may be called the reference signal (reference RS), source RS, or simply the reference.

[0024] The channel on which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the following: Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel (PUSCH), or Physical Uplink Control Channel (PUCCH).

[0025] Furthermore, the RS that has a QCL relationship with the channel may be at least one of the following: 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), or a Demodulation Reference Signal (DMRS)).

[0026] An SSB is a signal block that includes 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 called an SS / PBCH block.

[0027] The RS of a QCL type X in a TCI state may also mean the RS in the relationship between a channel / signal (or its DMRS) and a QCL type X, and this RS may also be called the QCL source of the QCL type X in that TCI state.

[0028] (Inter-cell mobility) In NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will perform DL transmissions to the UE. It is also being considered that the UE will perform UL transmissions to one or more TRPs.

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

[0030] Figure 1A shows an example of inter-cell mobility including a non-serving cell (e.g., Single-TRP inter-cell mobility). Here, the UE receives channels / signals from the base station / TRP of cell #1, which is the serving cell, and from the base station / TRP of cell #3, which is not the serving cell (it becomes a non-serving cell). This corresponds, for example, to the UE switching from cell #1 to cell #3 (e.g., a fast cell switch).

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

[0032] Figure 1B shows an example of a multi-TRP scenario (e.g., multi-TRP inter-cell mobility). Here, the UE receives channels / signals from TRP#1 and TRP2. Here, TRP#1 is located in cell #1 (PCI#1) and TRP#2 is located in cell #2 (PCI#2).

[0033] Multi-TRPs (TRP#1, #2) may be connected by an ideal / non-ideal backhaul, and information, data, etc., may be exchanged. Each TRP in a multi-TRP may transmit a different code word (CW) and a different layer. As one form of multi-TRP transmission, Non-Coherent Joint Transmission (NCJT) may be used, as shown in Figure 1B. Here, we show a case where NCJT is performed between multiple cells (for example, cells of different PCIs). Note that the same serving cell settings may be applied / configured for TRP#1 and TRP#2.

[0034] In NCJT, for example, TRP#1 modulates and layers a first codeword and transmits a first signal / channel (e.g., PDSCH) using a first precode across a first number of layers (e.g., 2 layers). Similarly, TRP#2 modulates and layers a second codeword and transmits a second signal / channel (e.g., PDSCH) using a second precode across a second number of layers (e.g., 2 layers).

[0035] Multiple PDSCHs (Multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from TRP#1 and the second PDSCH from TRP#2 may overlap in at least one of the time and frequency resources.

[0036] These first and second PDSCHs may be assumed not to be quasi-co-located. Reception of multiple PDSCHs may be reinterpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0037] Multiple PDSCHs from a multi-TRP (which may also be called multiple PDSCHs) may be scheduled using a single DCI (single DCI (S-DCI), single PDCCH) (single master mode). A single DCI may be transmitted from one TRP in the multi-TRP. A configuration using a single DCI in a multi-TRP may be called a single-DCI-based multi-TRP (mTRP / MTRP).

[0038] Multiple PDSCHs from a multi-TRP may be scheduled using multiple DCIs (multi-DCI (M-DCI), multi-PDCCH (multiple PDCCH)) (multi-master mode). Multiple DCIs may be transmitted from each of the multi-TRPs. A configuration that utilizes multiple DCIs in a multi-TRP may be called a multi-DCI-based multi-TRP (mTRP / MTRP).

[0039] A UE may assume that it sends separate CSI reports (CSI reports) for different TRPs, each for each TRP. Such CSI feedback may be called separate feedback, separate CSI feedback, etc. In this disclosure, “separate” may be interpreted as “independent.”

[0040] As shown in Figure 1, when using multiple TRPs, the distance between the UE and each TRP may differ. 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 will be different.

[0041] In existing systems, the transmission timing of UL (Uplink) channels and / or UL signals (UL channels / signals) is adjusted by Timing Advance (TA). The reception timing of UL channels / signals from different user terminals (UEs) is adjusted at the base station (TRP: Transmission and Reception Point, also known as gNB: gNodeB, etc.).

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

[0043] For example, the question arises of how to support different timing advances (e.g., TA) for serving cells and non-serving cells.

[0044] Furthermore, it is conceivable to use PRACH transmission with PDCCH order to measure the timing advance for serving cells / non-serving cells. In such cases, the question arises as to how to control PRACH transmission (or timing advance measurement using PRACH).

[0045] For example, if a PRACH is triggered by a PDCCH order, the UE needs to consider how to control the transmission conditions (e.g., PRACH settings / transmit power) applied to the PRACH transmission triggered by that PDCCH order (or the PRACH trigger).

[0046] The inventors of this invention conceived this embodiment after studying UL transmission timing control for multiple cells (e.g., serving cells / non-serving cells).

[0047] The embodiments relating to this disclosure will be described in detail below with reference to the drawings. Each embodiment may be applied individually or in combination.

[0048] In this 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 this disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc., may be interpreted interchangeably.

[0050] In this disclosure, RRC, RRC parameters, RRC messages, upper layer parameters, information elements (IE), and settings may be interpreted interchangeably. In this disclosure, MAC CE, update commands, and activation / deactivation commands may be interpreted interchangeably. In this disclosure, support, control, controllable, operate, and operable may be interpreted interchangeably.

[0051] Furthermore, in this disclosure, sequences, lists, sets, groups, and the like may be interpreted interchangeably.

[0052] In this disclosure, panels, beams, panel groups, beam groups, Uplink (UL) transmit entities, TRPs, spatial relation information (SRI), spatial relations, control resource sets (CORESET), Physical Downlink Shared Channel (PDSCH), codewords, base stations, predetermined antenna ports (e.g., Demodulation Reference Signal (DMRS) ports), predetermined antenna port groups (e.g., DMRS port groups), predetermined groups (e.g., Code Division Multiplexing (CDM) groups, predetermined reference signal groups, CORESET groups), predetermined resources (e.g., predetermined reference signal resources), predetermined resource sets (e.g., predetermined reference signal resource sets), CORESET pools, PUCCH groups (PUCCH resource groups), spatial relation groups, downlink TCI states (DL TCI states), uplink TCI states (UL TCI states), unified TCI states, etc., may be interpreted interchangeably.

[0053] The panel may be associated with at least one of the following: a group index for SSB / CSI-RS groups, a group index for group-based beam reporting, or a group index for SSB / CSI-RS groups for group-based beam reporting.

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

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

[0056] In this disclosure, a UE with multiple TRPs configured may determine at least one of the following based on at least one of the following: a TRP corresponding to a DCI, a TRP corresponding to a PDSCH or UL transmission scheduled by a DCI (such as PUCCH, PUSCH, or SRS): The values ​​of the specified fields included in DCI (e.g., the field specifying TRP, the antenna port field, PRI). • The DMRS corresponding to the scheduled PDSCH / PUSCH (e.g., the DMRS family, resources, CDM group, DMRS port, DMRS port group, antenna port group, etc.). The DMRS corresponding to the PDCCH from which the DCI was sent (e.g., the DMRS family, resources, CDM group, DMRS port, DMRS port group, etc.). The CORESET that received the DCI (for example, the CORESET pool ID of the CORESET, the ID of the CORESET, the scrambled ID (which may be replaced with a series ID), the resource, etc.). RS (RS-related group, etc.) is used in TCI status, QCL assumptions, spatial relationship information, etc.

[0057] In this 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)). 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 this disclosure, for a single DCI, the i-th TRP (TRP#i) may mean 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 mean 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. Multiple PDCCHs may also be assumed to be supported when multiple TRPs utilize a non-ideal backhaul.

[0060] The ideal backhaul may also 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 also 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 this disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interpreted as mutually exclusive.

[0062] In this 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 code point may be interpreted as mutually exclusive.

[0063] In this disclosure, the terms "multi-DCI (mDCI)," "multi-PDCCH," "multi-TRP system based on multi-DCI," "mDCI-based MTRP," "two CORESET pool indices," or "CORESET pool index = 1 (or a value of 1 or more)" may be interpreted interchangeably.

[0064] The QCLs in this disclosure may be interpreted interchangeably with QCL Type D.

[0065] In the following explanation, the terms TA maintenance, adjustment, update, setting, measurement, calculation, and acquisition may be interpreted interchangeably.

[0066] The configuration shown in the following aspects may be used for PRACH transmission in timing advance measurement when supporting transmission to multiple cells (e.g., serving cells and non-serving cells), or it 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 a PRACH transmission instruction is received (for example, PRACH settings to be applied to the PRACH transmission).

[0068] In this disclosure, instructions for PRACH transmission may be given by PDCCH (or DCI), and a PDCCH that instructs PRACH transmission may be called a PDCCH order (e.g., a PDCCH order). A PRACH transmitted based on a PDCCH order may also be called a PDCCH-ordered PRACH (e.g., a PDCCH order PRACH).

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

[0070] Alternatively, cells that perform PRACH transmissions may not be notified to the UE by the base station, and the UE may control PRACH transmissions using predetermined PRACH settings based on the PDCCH order.

[0071] When a PDCCH instructing a 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 the parameters used for PRACH transmission, PRACH settings (e.g., PRACH configuration), and PRACH resource settings (e.g., PRACH resource configuration) based on at least one of the following options 1-1 to 1-2. In this disclosure, PRACH settings, PRACH transmission parameters, and PRACH resource settings may be interpreted interchangeably.

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

[0073] Figure 2A shows the case where the same / common PRACH settings are used for both PRACH transmissions to serving cells and PRACH transmissions to non-serving cells.

[0074] The PRACH settings for a serving cell and the PRACH settings for a non-serving cell may be the same / common. For example, a PRACH setting for a specific cell (e.g., a serving cell) may be set by the base station to the UE, and the UE may use the PRACH setting set for that specific cell to control PRACH transmission, regardless of the cell from which the PRACH is transmitted. Note that the PRACH setting may be set independently of a cell, or it may be set for PRACH transmission in the PDCCH order.

[0075] Furthermore, the UE may transmit PRACH without determining (or being aware of) whether the cell to which the PRACH is to be transmitted 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 to which the PRACH is to be transmitted.

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

[0077] The PDCCH order configuration should be the same as that of existing systems (e.g., Rel.16 and earlier), and no extensions to the PDCCH order are required.

[0078] Alternatively, the base station may instruct / configure the UE with information about the cell to be transmitted via PRACH. In this case, the base station corresponding to the cell to be transmitted via PRACH only needs to 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 it may not be limited to a specific cell (e.g., the specification may not define which cell (or base station) transmits the PDCCH order).

[0080] Thus, when PRACH transmission to serving cells / non-serving cells is supported, using a common PRACH setting for such PRACH transmission can suppress the increase in overhead of information that the base station sets / instructs the UE to do.

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

[0082] Figure 2B shows the case where the first PRACH setting (e.g., the PRACH setting corresponding to the serving cell) is used for sending a PRACH (e.g., PDCCH order PRACH) to the first cell (e.g., the serving cell). On the other hand, it shows the case where the second PRACH setting (e.g., the PRACH setting corresponding to the non-serving cell) is used for sending a PRACH (e.g., PDCCH order PRACH) to the second cell (e.g., the non-serving cell).

[0083] The first PRACH setting corresponding to the first cell (e.g., a serving cell) and the second PRACH setting corresponding to the second PRACH setting (e.g., a non-serving cell) may be set separately by upper-layer signaling or the like.

[0084] PRACH settings from an existing system (e.g., Rel.16 or earlier) may be used for serving cells, and in addition to these PRACH settings, new RRC parameters (e.g., Rel.17 RRC parameters) may support PRACH settings for non-serving cells.

[0085] If there are multiple first cells, a common PRACH setting may be applied / configured for all of them. Alternatively, if there are multiple first cells, a separate PRACH setting may be applied / configured for each of them.

[0086] If there are multiple second cells, a common PRACH setting may be applied to / configured for all of them. Alternatively, if there are multiple second cells, a separate PRACH setting may be applied to / configured for each of them. Furthermore, a common PRACH setting may be set for multiple first cells, and separate PRACH settings may be set for multiple second cells. Alternatively, separate PRACH settings may be set for multiple first cells, and a common PRACH setting may be set for multiple second cells.

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

[0088] The target cell to which the PRACH setting applied to the PRACH transmission corresponds, or information regarding the target cell for the PRACH transmission, may be explicitly or implicitly instructed 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 associated with the PRACH transmission (e.g., synchronous signal block (SSB) / PDCCH order).

[0091] For example, 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 a PDCCH order (or a PRACH transmitted by a PDCCH order) corresponds based on predetermined parameters used for the PDCCH order (or other signals / channels associated with the PDCCH).

[0093] For example, a pseudo-collocation source of PDCCH used in the PDCCH order (e.g., a QCL source) may be used to implicitly instruct the UE whether the target cell is a serving cell or a non-serving cell. In this case, the target cell can be instructed to the UE without extending the PDCCH order.

[0094] If the PDCCH order (e.g., PDCCH / DCI) is for the serving cell and QCL, the UE may control the sending of the PRACH (e.g., PDCCH ordered PRACH) instructed to be sent by the PDCCH order to the serving cell. In this case, the UE should apply the PRACH setting associated with the serving cell to the PRACH transmission.

[0095] If the PDCCH order (e.g., PDCCH / DCI / CORESET) is for a non-serving cell and QCL, the UE may control the transmission of the PRACH (e.g., PDCCH ordered PRACH) instructed to be sent by the PDCCH order to the non-serving cell. In this case, the UE should apply the PRACH setting associated with the non-serving cell to the PRACH transmission.

[0096] Figure 3 shows a synchronization signal block / CSI-RS transmitted in a non-serving cell (in this case, cell #1) and a PDCCH order (PDCCH / DCI / CORESET) transmitted in the serving cell when it is QCL. In this case, the UE may determine that the PDCCH order triggered the PRACH transmission to non-serving cell #1.

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

[0098] In this way, by implicitly notifying the UE of the target cells, it becomes unnecessary to explicitly specify the target cells using the PDCCH order. This helps to suppress the increase in overhead associated with the PDCCH order.

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

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

[0101] If PDCCH (or DCI / CORESET) is associated with the TCI state from the 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 serving cell's PRACH setting. The UE may then determine the TA of the serving cell based on the DL transmission (e.g., RAR) that is fed back to 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 for the corresponding cell (e.g., cell index / cell type (e.g., serving cell / non-serving cell)) and notify the UE. In a predetermined DCI format used in the PDCCH order (e.g., DCI format 1_0), X reserved bits of the DCI may be used to notify the cell in order for PRACH to explicitly indicate the corresponding serving cell / non-serving cell. These reserved bits may be reserved bits included in DCI format 1_0 in an existing system (e.g., Rel. 15 / 16).

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

[0105] Furthermore, if three non-serving cells are configured, X may be 2 bits. To indicate a non-serving cell, the re-indexed index of the non-serving cell may be applied. The association between the cell index and the bit value (or code point) may be defined in the specification or established by higher-layer signaling, etc. For example, the code point '0' or '00' may indicate a serving cell, and the remaining bits may be associated with the index order of the configured non-serving cells (e.g., ascending / descending).

[0106] Alternatively, the size of X may be fixed, and the number of bits may not change regardless of the number of non-serving cells set. 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 within a predetermined range (e.g., 0-63), a portion of the preamble may be configured / activated by the RRC / MAC CE to relate to non-serving cells.

[0108] In this case, information about serving / non-serving cells 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. The preamble settings associated with non-serving cells may be configured to apply only to PRACH transmissions based on the PDCCH order (or not to collision-type PRACH transmissions).

[0109] If DCI specifies a preamble associated with a non-serving cell, the UE may control the PRACH transmission to have the specified preamble, according to the RACH settings of the non-serving cell.

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

[0111] (Second aspect) The second aspect describes other examples of UE behavior when a PRACH transmission instruction is received (e.g., received power to apply to the PRACH transmission).

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

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

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

[0115] If a PDCCH is received that instructs the UE to send a PRACH, 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 PRACH transmission power using predetermined parameters corresponding to a specific cell (e.g., the parameter for the synchronization signal block / ss-PBCH-BlockPower), regardless of the cell to which the PRACH transmission is targeted (e.g., the destination cell). The predetermined parameters, predetermined power parameters, and predetermined power information may be interchangeable.

[0117] For example, when a UE receives a PDCCH order, it may control the PRACH transmit power using predetermined power parameters corresponding to a specific cell (e.g., a serving cell) (see Figure 4A). Figure 4A shows the case where the same / common predetermined power parameters are used for PRACH transmissions to serving cells and PRACH transmissions to non-serving cells.

[0118] The predetermined power parameters corresponding to a serving cell and the predetermined power parameters corresponding to a non-serving cell may be the same / common. For example, predetermined power parameters corresponding to a specific cell (e.g., a serving cell) may be set by the base station to the UE, and the UE may control the transmission power of the PRACH using the predetermined power parameters set for that specific cell, regardless of the cell from which the PRACH is transmitted. Note that the predetermined power parameters may be set independently of cells, or they may be set for PRACH transmissions in the PDCCH order.

[0119] Furthermore, the UE may control the PRACH transmission power without determining (or being aware of) whether the cell to which PRACH is transmitted 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 to which PRACH is transmitted.

[0120] The PDCCH order configuration should be the same as that of existing systems (e.g., Rel.16 and earlier), and no extensions to the PDCCH order are required.

[0121] Thus, when PRACH transmission to serving / non-serving cells is supported, the overhead of information set / instructed from the base station to the UE can be suppressed by using common predetermined power parameters for such PRACH transmission.

[0122] <Option 2-2> The UE may control the transmission of the PRACH (or the applied transmission power) based on the cell to which the PRACH transmission is targeted (e.g., the destination cell). For example, when the UE receives a PDCCH order, it may control the transmission power of the PRACH using a predetermined power parameter corresponding to the cell to which the PRACH transmission is targeted (e.g., the parameter for the synchronization signal block / ss-PBCH-BlockPower) (see Figure 4B).

[0123] Figure 4B shows a case where a first predetermined power parameter (e.g., a predetermined power parameter corresponding to the serving cell) is used for transmitting a PRACH (e.g., PDCCH order PRACH) to a first cell (e.g., a serving cell). On the other hand, it shows a case where a second predetermined power parameter (e.g., a predetermined power parameter corresponding to the non-serving cell) is used for transmitting a PRACH (e.g., PDCCH order PRACH) to a second cell (e.g., a non-serving cell).

[0124] A first predetermined power parameter corresponding to a first cell (e.g., a serving cell) and a second predetermined power parameter corresponding to a second PRACH setting (e.g., a non-serving cell) may be set separately by upper-layer signaling or the like.

[0125] Predetermined power parameters of an existing system (e.g., Rel.16 or earlier) may be used for serving cells, and in addition to these predetermined power parameters, new RRC parameters (e.g., Rel.17 RRC parameters) may be supported to provide predetermined power parameters for non-serving cells (e.g., ss-PBCH-BlockPower config).

[0126] If there are multiple first cells, a common predetermined power parameter may be applied / set for all of them. Alternatively, if there are multiple first cells, a predetermined power parameter may be applied / set separately for each of them.

[0127] If there are multiple second cells, a common predetermined power parameter may be applied / set for all of them. Alternatively, if there are multiple second cells, the predetermined power parameter may be applied / set separately for each of them. Furthermore, a predetermined power parameter may be set commonly for multiple first cells, and a predetermined power parameter may be set separately for multiple second cells. Alternatively, a predetermined power parameter may be set separately for multiple first cells, and a predetermined power parameter may be set commonly for multiple second cells.

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

[0129] The target cell to which the PRACH setting applied to the PRACH transmission corresponds, or information regarding the target cell for the PRACH transmission, may be explicitly or implicitly instructed 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 associated with the PRACH transmission (e.g., synchronous signal block (SSB) / PDCCH order).

[0132] For example, 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 a PDCCH order (or a PRACH transmitted by a PDCCH order) corresponds based on predetermined parameters used for the PDCCH order (or other signals / channels associated with the PDCCH).

[0134] For example, a pseudo-collocation source of PDCCH used in the PDCCH order (e.g., a QCL source) may be used to implicitly instruct the UE whether the target cell is a serving cell or a non-serving cell. In this case, the target cell can be instructed to the UE without extending the PDCCH order.

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

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

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

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

[0139] In this way, by implicitly notifying the UE of the target cells, it becomes unnecessary to explicitly specify the target cells using the PDCCH order. This helps to suppress the increase in overhead associated with the PDCCH order.

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

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

[0142] If PDCCH (or DCI / CORESET) is associated with the TCI state from the 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 predetermined power parameters of the serving cell. The UE may then determine the TA of the serving cell based on DL transmissions (e.g., RARs) that are fed back to the PRACH transmission.

[0143] 《Option 2-2-2》 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. The specific operation may be the same as option 1-2-2 described above.

[0144] 《Option 2-2-3》 If the random access preamble index (e.g., ra-PreambleIndex) is a predetermined value (e.g., 0-63), a portion of the preamble may be configured / activated by the RRC / MAC CE to relate to non-serving cells. The specific operation may be the same as option 1-2-3 described above.

[0145] (Third aspect) The third aspect describes a pseudo-collocation assumption (e.g., QCL assumption) for PRACH triggered in PDCCH order (e.g., PRACH of message 1).

[0146] When a PRACH transmission is made according to a PDCCH order, a response signal (PDSCH including RAR) and a 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 that schedules a PDSCH containing RAR (e.g., a PDCCH containing DCI format 1_0) and the PDCCH order will be pseudo-collocated (e.g., they will have the same DMRS antenna port pseudo-collocation characteristics). Furthermore, it is specified that a PDSCH scheduled to that PDCCH (e.g., a PDSCH containing RAR) and the PDCCH order will be pseudo-collocated.

[0148] On the other hand, existing systems do not specify how to assume the QCL assumption for message 1, which corresponds to PRACH triggered in the PDCCH order.

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

[0150] <Option 3-1> For PRACH in PDCCH order for serving cells / non-serving cells, a QCL assumption / spatial relation (e.g., QCL assumption / spatial relation) with at least one of a given signals / channels may be specified / set.

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

[0152] The PRACH in message 1 can be any PRACH other than the PRACH triggered in that PDCCH order. For example, it may be a PRACH sent in a collision type PRACH.

[0153] The DCI that schedules RAR (or PDSCH containing RAR) may be a predetermined DCI format (e.g., DCI format 1_0) that scrambles the CRC with RA-RNTI and schedules a PDSCH containing RAR.

[0154] PDSCHs including RAR may be PDSCHs scheduled by DCIs that are CRC scrambled with 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> The QCL relationship / spatial relationship between the PRACH of the PDCCH order and a given signal / channel may be determined / derived based on the synchronization signal block associated with the PDCCH order corresponding to the serving cell or non-serving cell.

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

[0158] The type of cell associated with the SSB 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 whether the SSB is associated with a serving cell or a non-serving cell. For example, a predetermined field in the DCI used in the PDCCH order may specify whether it corresponds to a serving cell or a non-serving cell.

[0160] 《Option 3-2-2》 The PDCCH order may implicitly indicate an SSB associated with a serving cell or an SSB associated with a non-serving cell. For example, whether it corresponds to a serving cell or a non-serving cell may be specified based on the QCL source reference signal (e.g., QCL source RS) or root SSB associated with the serving cell or non-serving cell.

[0161] (UE capability information) In the first to third embodiments described above, the following UE capabilities may be set. Note that the following UE capabilities may be interpreted as parameters (e.g., higher-layer parameters) set on the UE from the network (e.g., base station).

[0162] UE capability information may be defined regarding whether or not it supports at least one of inter-cell mobility and inter-cell multi-TRP.

[0163] UE capability information regarding whether or not to support multiple cell IDs / different cell IDs (e.g., multiple PCIs / different PCIs) may be defined.

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

[0165] The first to third embodiments may be configurations applied to a UE that supports / reports at least one of the UE capabilities described above. Alternatively, the first to third embodiments may be configurations applied to a UE configured from a network.

[0166] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0167] Figure 6 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0168] Furthermore, the wireless communication system 1 may 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)), and so on.

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

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

[0171] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, 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 (CC) and Dual Connectivity (DC).

[0173] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0174] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0175] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0176] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0177] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0178] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. 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), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0179] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0180] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0181] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0182] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0183] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0184] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0185] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0186] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0187] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0188] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[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 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0191] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0192] (base station) Figure 7 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0193] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0194] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0195] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0196] The transmitting / receiving 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 transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0197] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0198] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0199] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

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

[0201] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0202] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0203] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0204] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0205] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0206] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to 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 also measure received power (e.g., Reference Signal Received Power (RSRP)), reception 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 send and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0208] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

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

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

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

[0212] (User terminal) Figure 8 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0213] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0214] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

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

[0216] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0217] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0218] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0219] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

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

[0221] The transmitting / receiving 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 and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0222] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0223] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0224] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0225] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

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

[0227] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also 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] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0229] The transmitting / receiving unit 220 may receive a downlink control channel instructing the transmission of a random access channel to at least one of the serving cell and non-serving cells.

[0230] When the control unit 210 transmits a random access channel based on a downlink control channel, it may control the transmission of the random access channel based on at least one of the random access channel settings corresponding to a predetermined cell and power information relating to a synchronization signal block corresponding to a predetermined cell.

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

[0232] The control unit 210 may determine, based on the cell where the downlink control channel becomes a pseudo-collocation, at least one of the following: the cell that transmits the random access channel, the random access channel settings to apply to the transmission of the random access channel, and the transmission power to apply to the transmission of the random access channel.

[0233] The control unit 210 may determine at least one of the signals and channels that result in pseudo-collocation of the random access channel based on the synchronization signal block associated with the downlink control channel.

[0234] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0235] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0236] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 9 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0237] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0238] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

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

[0240] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0241] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. 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 other functional blocks may be implemented similarly.

[0242] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

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

[0244] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0245] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0246] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for 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), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0248] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0249] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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 neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

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

[0252] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0253] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0254] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0255] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0256] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0257] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

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

[0259] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0260] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0261] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0262] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0263] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0264] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

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

[0266] At least one of the configured BWPs may be active, and the UE does not need to assume that it will transmit or receive a given channel / signal outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0267] Note that the structures such as the above-described radio frame, subframe, slot, minislot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

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

[0269] The names used for parameters, etc. in the present disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

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

[0271] Also, information, signals, etc. may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0272] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[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), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or combinations thereof.

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

[0275] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0276] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0277] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0278] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0279] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0280] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0281] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0282] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services 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 ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

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

[0284] A mobile station may also be called 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 appropriate term.

[0285] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a 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 be a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0286] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this 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), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0287] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0288] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0289] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0290] Each aspect / embodiment described in this disclosure includes 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 (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may be applied to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that extend these. It may also be applied in combination with multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0291] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0292] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any form.

[0293] The term "determining" as used in this disclosure may encompass a variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, searching, inquiring" (e.g., searching in a table, database, or another data structure), "ascertaining", etc.

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

[0295] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be "determining" any operation.

[0296] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0297] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0298] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0299] In this 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 "combine" may be interpreted similarly to "different."

[0300] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0301] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0302] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

[0303] This application is based on Japanese Patent Application No. 2021-132433, filed on August 16, 2021. All of its contents are included here.

Claims

1. A receiving unit that receives a downlink control channel (PDCCH) instructing the transmission of a random access channel (PRACH) to a serving cell and at least one cell different from the serving cell, When transmitting the PRACH based on the PDCCH, the system includes a control unit that controls the transmission of the PRACH based on power information relating to a synchronization signal block (SSB) corresponding to a predetermined cell, The control unit is a terminal that determines the PRACH setting to be applied to the PRACH transmission based on the cell that receives the demodulation reference signal of the PDCCH, the channel state information reference signal (CSI-RS) which is a pseudo-collocation (QCL), and the SSB which is a QCL.

2. The terminal according to claim 1, wherein a cell different from the serving cell is set by a different physical cell ID from the serving cell.

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

4. A transmitting unit that transmits a downlink control channel (PDCCH) instructing the transmission of a random access channel (PRACH) to a serving cell and at least one cell different from the serving cell, When the PRACH is transmitted based on the PDCCH, the system includes a control unit that controls the reception of the PRACH to which power information relating to a synchronization signal block (SSB) corresponding to a predetermined cell is applied. The control unit notifies the base station of the PRACH settings to be applied to the PRACH transmission, based on the cell that transmits the demodulation reference signal of the PDCCH, the channel state information reference signal (CSI-RS) which is a pseudo-collocation (QCL), and the SSB which is a QCL.

5. A system including a terminal and a base station, The aforementioned terminal is A receiving unit that receives a downlink control channel (PDCCH) instructing the transmission of a random access channel (PRACH) to a serving cell and at least one cell different from the serving cell, When transmitting the PRACH based on the PDCCH, the system includes a control unit that controls the transmission of the PRACH based on power information relating to a synchronization signal block (SSB) corresponding to a predetermined cell, The control unit determines the PRACH setting to be applied to the PRACH transmission based on the cell that receives the demodulation reference signal of the PDCCH, the channel state information reference signal (CSI-RS) which is a pseudo-collocation (QCL), and the SSB which is a QCL. The aforementioned base station is A system having a transmitting unit that transmits the PDCCH.

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