Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives a downlink control channel that supports triggering of a random access preamble (PRACH) for a plurality of candidate cells; and a control unit that determines, on the basis of the downlink control channel, one or more candidate cells that perform transmission of the PRACH, the plurality of candidate cells including a first candidate cell having monitoring of an acknowledgement signal (RAR) for the PRACH and a second candidate cell not having monitoring of the RAR for the PRACH.

Description

TECHNICAL FIELD

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

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

[0003] A subsequent system of LTE (for example, also referred to as a 5th generation mobile communication system (5G), 5G+, a 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also being researched.

[0004] PRIOR ART DOCUMENTS

[0005] NON-PATENT LITERATURE

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

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In a future wireless communication system (for example, a wireless communication system after Rel. 16 / 5G), it is envisaged to control communication based on inter-cell mobility including a plurality of cells including a non-serving cell, or inter-cell mobility using a plurality of transmission reception points (for example, Multi-TRP (MTRP)). In the inter-cell mobility, it is also envisaged to set a candidate cell independently of a serving cell, and to perform switching / switching of the serving cell and the candidate cell.

[0009] However, in a case where inter-cell mobility (for example, switching of a serving cell and a candidate cell, and the like) is applied, how to control UL transmission (for example, control of timing advance, and the like) becomes a problem. For example, it is envisaged to support a random access procedure with a random access response (RAR) and a random access procedure without an RAR as a method of acquisition of timing advance.

[0010] However, a control method (for example, UE operation) in a case where a random access procedure with a random access response (RAR) and a random access procedure without an RAR are supported is not clear. In a case where a random access procedure is not properly performed, inter-cell mobility cannot be properly performed, and there is a concern that the quality of communication is degraded.

[0011] The present disclosure is made in view of this point, and one of the objects is to provide a terminal, a wireless communication method, and a base station capable of properly controlling communication even in a case where inter-cell mobility using a random access procedure is performed.

[0012] Means for solving the problem

[0013] A terminal according to one embodiment of the present disclosure includes a reception unit that receives a downlink control channel supporting triggering of a random access preamble (PRACH) for a plurality of candidate cells, and a control unit that judges one or more candidate cells in which transmission of the PRACH is performed, based on the downlink control channel, the plurality of candidate cells including a first candidate cell having monitoring of a response signal (RAR) for the PRACH, and a second candidate cell not having monitoring of the RAR for the PRACH.

[0014] Effects of the invention

[0015] According to one embodiment of the present disclosure, communication can be properly controlled even in a case where inter-cell mobility using a random access procedure is performed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1A is a diagram showing an example of movement of a UE in Rel. 17.Figure 1B is a diagram showing an example of UE's mobility in Rel. 18.

[0017] Figure 2 is a diagram showing an example of association of serving cell and candidate cell.

[0018] Figure 3A is a diagram showing a second example of Option 2 of candidate cell setup. Figure 3B is a diagram showing a third example of Option 2 of candidate cell setup.

[0019] Figure 4 is a diagram showing a serving cell handover example 1.

[0020] Figure 5 is a diagram showing a serving cell handover example 2.

[0021] Figure 6 is a diagram showing a serving cell handover example 3.

[0022] Figure 7 is a diagram showing an example of timing advance group (TAG) to which cells included in a cell group belong.

[0023] Figure 8 is a diagram showing an example of MAC CE for timing advance command.

[0024] Figure 9 is a diagram showing another example of MAC CE for timing advance command.

[0025] Figure 10 is a diagram showing an example of setup of TAG in case of supporting association of TAG ID for candidate cell.

[0026] Figure 11 is a diagram showing an overview of L1L2-triggered mobility (LTM).

[0027] Figure 12 is a diagram showing PDCCH ordered RACH (PDCCH ordered RACH) for serving cell with PDCCH-based indication with random access response (RAR) monitoring.

[0028] Figure 13 is a diagram showing PDCCH ordered RACH (PDCCH ordered RACH) for candidate cell with PDCCH-based indication without random access response (RAR) monitoring.

[0029] Figure 14A and Figure 14Bis a diagram representing an example of a DCI field that is a notification of identification information for a cell.

[0030] Figure 15A and Figure 15B is a diagram representing an example of a candidate cell indicated by DCI according to the first embodiment.

[0031] Figure 16 is a diagram representing another example of a candidate cell indicated by DCI according to the first embodiment.

[0032] Figures 17A-17C is a diagram representing an example of a candidate cell indicated by DCI (bitmap) according to the first embodiment.

[0033] Figure 18 is a diagram representing an example of a control method in a case where a plurality of RA procedures are generated according to the second embodiment.

[0034] Figure 19 is a diagram representing another example of a control method in a case where a plurality of RA procedures are generated according to the second embodiment.

[0035] Figure 20 is a diagram representing another example of a control method in a case where a plurality of RA procedures are generated according to the second embodiment.

[0036] Figure 21 is a diagram representing an example of an outline structure of a wireless communication system according to an embodiment.

[0037] Figure 22 is a diagram representing an example of a structure of a base station according to an embodiment.

[0038] Figure 23 is a diagram representing an example of a structure of a user terminal according to an embodiment.

[0039] Figure 24 is a diagram representing an example of a hardware structure of a base station and a user terminal according to an embodiment.

[0040] Figure 25 is a diagram representing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0041] (TCI, spatial relation, QCL)

[0042] In NR, it is under study to control at least one of a signal and a channel (expressed as a signal / channel) in a reception process (for example, at least one of reception, demapping, demodulation, and decoding) and a transmission process (for example, at least one of transmission, mapping, precoding, modulation, and coding) in a UE based on a transmission configuration indication state (TCI state).

[0043] The TCI state can also indicate a TCI state applied to a signal / channel of a downlink. What is equivalent to a TCI state applied to a signal / channel of an uplink can also be expressed as a spatial relation.

[0044] The so-called TCI state is information related to quasi co-location (QCL) of a signal / channel, and can also be referred to as a spatial reception parameter, spatial relation information, and the like. The TCI state can also be set to a UE per channel or per signal.

[0045] The so-called QCL is an indicator indicating a statistical property of a signal / channel. For example, it can mean that, in a case where a certain signal / channel is in a QCL relationship with other signal / channels, it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (for example, a spatial Rx parameter) is the same among the different plurality of signal / channels (as to at least one of them being QCL).

[0046] In addition, the spatial reception parameter can also correspond to a reception beam (for example, a reception analog beam) of a UE, and the beam can also be determined based on spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure can also be rewritten as sQCL (spatial QCL).

[0047] The QCL can also be provided with a plurality of types (QCL types). For example, four QCL types, Types A-D, can be set, in which different parameters (or sets of parameters) can be assumed to be the same in the four QCL types A-D, and the parameter (which can also be referred to as a QCL parameter) is indicated as follows:

[0048] • QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0049] • QCL Type B (QCL-B): Doppler shift and Doppler spread,

[0050] • QCL Type C (QCL-C): Doppler shift and average delay,

[0051] • QCL Type D (QCL-D): Spatial receive parameter.

[0052] A UE can also assume a certain control resource set (CORESET), channel, or reference signal to be in a certain QCL (e.g., QCL Type D) relationship with another CORESET, channel, or reference signal, referred to as a QCL assumption.

[0053] A UE can also determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on a TCI state or QCL assumption for the signal / channel.

[0054] A TCI state can also be information related to a QCL between a channel (in other words, a reference signal (RS) for the channel) that is a target and another signal (e.g., another RS). A TCI state can be configured (indicated) through higher layer signaling, physical layer signaling, or a combination thereof.

[0055] In addition, a channel / signal that is a target of application of a TCI state can be referred to as a target channel / RS, simply as a target, and the above-mentioned other signal can be referred to as a reference RS, a source RS, simply as a reference, and the like.

[0056] The channel to which the TCI state or the spatial relation is configured (specified) may, for example, also be at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0057] Furthermore, the RS to which the channel is in a QCL relationship may, for example, also be at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a reference signal for measurement (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also referred to as a Tracking Reference Signal (TRS)), a reference signal for QCL detection (also referred to as a QRS), a DeModulation Reference Signal (DMRS), and the like.

[0058] The SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB can also be referred to as an SS / PBCH block.

[0059] The RS of the QCL Type X of the TCI state may also mean a RS in a QCL Type X relationship with the (DMRS of) a certain channel / signal, which can also be referred to as a QCL source of the QCL Type X of the TCI state.

[0060] (L1 / L2 inter-cell mobility)

[0061] As above, UL transmission by a UE to one or plural cells / TRPs is under study. As a procedure in this case, consider the following Scenario 1 or Scenario 2. Also, in the present disclosure, a serving cell can also be rewritten as a TRP within the serving cell. Layer 1 / layer 2 (L1 / L2), DCI / Medium Access Control Control Element (MAC CE) can also be rewritten with each other. In the present disclosure, a PCI different from the physical cell ID (Physical Cell Identity (PCI)) of the current serving cell is sometimes also abbreviated as "different PCI". Non-serving cell, cell with different PCI, additional cell can also be rewritten with each other.

[0062] <Scenario 1>

[0063] Scenario 1 corresponds to, for example, inter-cell mobility with multiple TRPs, but can also be a scenario that does not correspond to inter-cell mobility with multiple TRPs.

[0064] (1) The UE receives from the serving cell: a configuration of SSB for beam measurement of a TRP corresponding to a PCI different from the serving cell, and a configuration of resources containing the different PCI required for use of radio resources for data transmission / reception.

[0065] (2) The UE performs beam measurement of the TRP corresponding to the different PCI, and reports the beam measurement result to the serving cell.

[0066] (3) Based on the above report, a Transmission Configuration Indication (TCI) state associated with the TRP corresponding to the different PCI is activated by L1 / L2 signaling from the serving cell.

[0067] (4) The UE performs transmission / reception using a UE-dedicated channel on the TRP corresponding to the different PCI.

[0068] (5) The UE needs to always cover the serving cell, including the case of multiple TRPs. As with the conventional system, the UE needs to use a common channel (Broadcast Control Channel (BCCH), Paging Channel (PCH)), etc. from the serving cell.

[0069] In Scenario 1, the serving cell (the assumption of the serving cell in the UE) is not changed when the UE transmits / receives a signal from an additional cell / TRP (a TRP corresponding to the PCI of the additional cell). The UE can also be configured from the serving cell with a higher layer parameter associated with the PCI of a non-serving cell. Scenario 1 can also be applied in Rel. 17, for example.

[0070] Figure 1A is a diagram indicating an example of movement of a UE in Rel. 17. The case where the UE moves from a cell of PCI #1 (serving cell) to a cell of PCI #3 (additional cell) (overlapping with the serving cell) is assumed. In this case, in Rel. 17, L1 / L2-based handover of the serving cell is not supported.

[0071] The additional cell is a cell having an additional PCI different from the PCI of the serving cell. The UE can receive / transmit a UE-specific channel from the additional cell. The UE needs to be located within the coverage of the serving cell in order to receive a UE-common channel (e.g., system information / paging / short message). In the case where the UE moves outside the coverage of the serving cell, handover of the cell by handover (also referred to as L3 mobility) or the like is required.

[0072] <Scenario 2>

[0073] In Scenario 2, L1 / L2 inter-cell mobility is applied. In L1 / L2 inter-cell mobility, RRC reconfiguration is not performed, and the serving cell is changed using a function such as beam control. In other words, transmission / reception with the additional cell can be performed without handover. Since a period during which data communication cannot be performed, in which RRC reconnection or the like is required for handover, occurs, by applying L1 / L2 inter-cell mobility that does not require handover, data communication can also continue at the time of serving cell change. Scenario 2 can also be applied in Rel. 18, for example. In Scenario 2, for example, the following procedure is performed.

[0074] (1) The UE receives a configuration of an SSB of a cell having a different PCI (additional cell) from the serving cell for beam measurement / change of the serving cell.

[0075] (2) The UE performs beam measurement of the cell having the different PCI and reports the measurement result to the serving cell.

[0076] (3) The UE can also receive a configuration of the cell having the different PCI (serving cell configuration) by higher layer signaling (e.g., RRC). That is, prior configuration related to change of the serving cell can also be performed. This configuration can be performed together with the configuration in (1) or separately.

[0077] (4) Based on the above report, the TCI state of the cell with different PCI can also be activated by L1 / L2 signaling according to the change of the serving cell. The activation of the TCI state and the change of the serving cell can also be performed separately.

[0078] (5) The UE changes the serving cell (the assumption of the serving cell in the UE), and starts receiving / transmitting using the UE-specific channel and the TCI state that are set in advance.

[0079] That is, in Scenario 2, the serving cell (the assumption of the serving cell in the UE) is updated by L1 / L2 signaling. Scenario 2 can also be applied in Rel.18.

[0080] Figure 1B is a diagram indicating an example of the movement of the UE in Rel.18. In Rel.18, the serving cell is switched by L1 / L2 (for example, DCI / MAC CE). The UE can receive / transmit the UE-specific channel / common channel between the new serving cell (or, target serving cell). The UE can also move out of the coverage of the current serving cell (for example, Current serving cell).

[0081] (Setting of multiple candidate cells)

[0082] Figure 2 is a diagram showing an example of the association of the serving cell and the candidate cell. Let SpCell#0, SCell#1, or SCell#2 be the serving cell. In addition, SpCell means a special cell (including the primary cell (PCell) and the primary secondary cell (PSCell)). SCell means a secondary cell. SpCell#0 is associated with candidate cell#0-1, candidate cell#0-2, and candidate cell#0-3. SCell#1 is associated with candidate cell#1-1. SCell#2 is associated with candidate cell#2-1 and 2-2. In this way, the serving cell can also be associated with more than one candidate cell (candidate serving cell).

[0083] Regarding the setting of the candidate cell (candidate cell) in the case of changing the serving cell, for example, the following Options 1 and 2 are considered.

[0084] < Option 1 >

[0085] As with the inter-cell mobility of Rel.17, the information in ServingCellConfig can also include information related to multiple candidate cells. In this case, multiple candidate cells need to share the same settings of PDCCH / PDSCH / UL, etc. with the serving cell.

[0086] For example, in the inter-cell mobility of Rel. 17, "mimoParam-r17" is added under ServingCellConfig, and PCI setting information is added. In the mimoParam-r17, additionalPCI-ToAddModList-r17, which is a list of information of additional SSBs having a PCI different from that of the serving cell, can also be included. In the candidate cell (additional cell, cell having an additional PCI), the same setting as that of the serving cell can be applied except for a part of the information.

[0087] <Option 2>

[0088] The multiple candidate cells can also be applied with the complete setting (e.g., ServingCellConfig) corresponding to each cell, and can be associated with each serving cell by reusing the carrier aggregation (CA) setting framework. That is, the candidate cell can not share the setting information with the serving cell, but can be applied with other settings. The UE can appropriately communicate with the candidate cell because the complete setting of each candidate cell is provided.

[0089] In the CA setting framework, the SpCell can be set per cell group, and multiple SCells can be added. It can also be that, by reusing the CA framework, the serving cell can be set per cell group for L1 / L2 inter-cell mobility, and multiple candidate cells can be set. The candidate cell can be activated / deactivated by the MAC CE. It can also be that the TCI information corresponding to the candidate cell is activated / deactivated by the MAC CE, whereby the candidate cell is activated / deactivated. This method is considered to be beneficial for reducing the complexity of UE operation.

[0090] Figure 3A is a diagram showing a first example of Option 2 of candidate cell setting. In Figure 3A In the example of Figure 3A , a common candidate cell pool for cell switching in the MCG / SCG is applied to the candidate cell. That is, the candidate cell is treated as one pool (group) regardless of the frequency band.

[0091] Figure 3B is a diagram showing a second example of Option 2 of candidate cell setting. In Figure 3B In the example of Figure 3B , multiple cell groups are set, and cell group switching can be performed by L1 / L2 signaling. The candidate cell is set per cell group, and the setting of each group includes the index of the corresponding SpCell and SCell.

[0092] (Signaling for serving cell change indication)

[0093] Implicit or explicit signaling for service cell change indication is described.

[0094] [Way 1]

[0095] In Way 1, implicit signaling for service cell change indication is described.

[0096] [[Option 1-1]]

[0097] In a case where one or more TCI states associated with a cell having a PCI different from the PCI of the serving cell are indicated (activated) by a MAC CE for a specific control resource set (CORESET) (e.g., at least one of CORESET#0, a CORESET of CH5 Type0-CSS, a CORESET of CH6 / CH7 / CH8 CSS) (a case where one or more TCI states associated with a cell having a PCI different from the PCI of the serving cell are indicated / activated by a MAC CE for a specific CORESET), the UE can also determine to change the serving cell to another cell (cell x, a cell having a different PCI). That is, the activation can also implicitly indicate a change of the serving cell to another cell.

[0098] In this case, the UE can also update the beam of another CORESET ID, another CORESET using CH6 / CH7 / CH8, or another CORESET using CSS, to the same TCI state as the activated TCI state described above.

[0099] [[Option 1-2]]

[0100] In a case where the TCI state of the PDSCH is activated / deactivated by a MAC CE, in a case where all of the TCI states activated by the MAC CE are associated with the same cell x having a PCI different from the PCI of the serving cell, the UE can also determine to change the serving cell to another cell (cell x). That is, the association can also implicitly indicate a change of the serving cell to another cell.

[0101] In the case of applying this option, in a case where the NW (base station) does not change the serving cell, the MAC CE needs to also include a TCI state associated with another cell (e.g., the current serving cell or a cell having a second different PCI) when activating the TCI state of the PDSCH associated with a cell having a different PCI.

[0102] [[Option 1-3]]

[0103] The MAC CE activates / deactivates unified TCI states (e.g., corresponding to the unified TCI framework of Rel. 17), and in a case where all of the activated unified TCI states are associated with the same cell x having different PCIs, the UE can also determine to change the serving cell to the other cell (cell x). That is, the association can also implicitly show the change of the serving cell to the other cell.

[0104] [Way 2]

[0105] In Way 2, explicit signaling for the serving cell change indication is described. Way 2 is applied, for example, to Scenario 2 described above.

[0106] [[Option 2-1]]

[0107] Hereinafter, an example of the serving cell change indication is described. In addition, the activation / deactivation of the non-serving cell, the change of the serving cell, and the transmission / reception with the other cell (non-serving cell) having a physical cell ID different from that of the serving cell can also be rewritten to each other.

[0108] The UE can also receive a new MAC CE for the activation / deactivation of the non-serving cell, which contains at least one of the fields (information) showing (1) to (3) below corresponding to the non-serving cell. In a case where the MAC CE is received, the UE can also determine to change the serving cell to the other cell (non-serving cell). Furthermore, the UE can also control the transmission / reception of the DL signal / UL signal with the non-serving cell based on the information. In addition, the non-serving cell can be one or a plurality of. In the example shown below, a MAC CE containing a plurality of fields indicating a plurality of non-serving cell indexes is applied.

[0109] (1) Serving cell ID.

[0110] (2) BWP ID.

[0111] (3) Non-serving cell ID for activation. The non-serving cell ID can also be replaced with arbitrary information (identifiable for the non-serving cell) corresponding to the non-serving cell.

[0112] As an example of (3), any one of, for example, (3-1) to (3-5) can be applied.

[0113] (3-1) PCI (PCI directly used). For example, 10 bits are used.

[0114] (3-2) Re-indexing of non-serving cells (new ID). The new ID can also be associated with a part of the PCI, and is set only to the serving cell and non-serving cells that the UE utilizes (can utilize). The new ID can reduce the number of bits compared to the PCI.

[0115] (3-3) CSI report configuration ID (CSI-ReportConfigId) (in the case where the CSI-ReportConfig corresponds to one or more non-serving cells).

[0116] (3-4) CSI resource configuration ID (CSI-ResourceConfigId) (in the case where the CSI-ResourceConfigId corresponds to one or more non-serving cells).

[0117] (3-5) Bitmap showing the activation / deactivation of each non-serving cell. The size (number of bits) of the bitmap can also be the same as the number of non-serving cells set on the CC. For example, in the case where the second non-serving cell among the three non-serving cells is activated, "010" is set.

[0118] At least one of the information included in the MAC CE can also be included in the DCI. Alternatively, at least one of the serving cells activated by the MAC CE can also be indicated by the DCI. The MAC CE / DCI can also include a field indicating the TCI state / SSB / CSI-RS from a cell having a different PCI, so that the DL beam monitored by the UE can be identified on the target cell (changed serving cell). The UE can also use the TCI state / SSB / CSI-RS to make a beam report (CSI report) and transmit it.

[0119] [[Option 2-2]]

[0120] The UE can also receive a MAC CE in which a new 1-bit field "C" is added to the existing MAC CE. The field indicates whether or not the change of the serving cell is performed. The UE can also receive the MAC CE and determine whether or not to change the serving cell to another cell based on the field.

[0121] [[Option 2-3]]

[0122] For the MAC CE in Option 2-2, further, a field indicating the serving cell index / PCI / other ID (new ID of Option 2-1 described above, etc.), a field of the TCI state / SSB / CSI-RS of the target cell (changed serving cell) can also be included in the MAC CE.

[0123] In this way, the indication for serving cell change is indicated via MAC CE / DCI, so the UE can make appropriate changes to the serving cell.

[0124] [Serving Cell Handover Example 1]

[0125] Figure 4 This diagram illustrates Example 1 of serving cell handover. For example, in the serving cell SpCell#0 of the MCG / SCG, if it is instructed via L1 / L2 signaling to change the serving cell to candidate cell #0-2, then candidate cell #0-2 becomes the new serving cell SpCell#0. Similarly, for example, in the serving cell SCell#2 of the MCG / SCG, if it is instructed via L1 / L2 signaling to change the serving cell to candidate cell #2-1, then candidate cell #2-1 becomes the new serving cell SCell#2.

[0126] [Serving Cell Handover Example 2]

[0127] The RRC / MAC CE can set global candidate cell IDs (cell#0, ..., 5) for each cell group, each band, each FR, and each UE. The UE can also be instructed to hand over the serving cell based on this global candidate cell ID.

[0128] Figure 5 This is a diagram illustrating example 2 of serving cell handover. (Compared to...) Figure 3A Similarly, by setting up a pool of multiple candidate cells, the serving cell can be switched to any (activated) candidate cell within the pool via L1 / L2 signaling. In this case, the set candidate cell can become either a SpCell or an SCell based on L1 / L2 signaling.

[0129] The UE can also receive indications of changes to the serving cell (from cell #2-1 to candidate cell 4) via MAC CE / DCI. Furthermore, the indicated candidate cell #4 becomes the SpCell of the new cell group.

[0130] [Serving Cell Handover Example 3]

[0131] The RRC / MAC CE can set global candidate cell IDs (cell#0-1, #0-1, ..., 2-2) for each cell group, each frequency band, each FR, and each UE. The UE can also be instructed to hand over the serving cell through this global candidate cell ID.

[0132] Figure 6is a diagram showing service cell switching case 3. The UE receives an indication of a change (change from cell #2-0 to cell #2-1) of a serving cell through a MAC CE / DCI. And, the indicated cell #2-1 becomes a new cell group's SpCell. In addition, cells (cell #0-0, cell #1-0) of the same cell group as the indicated cell #2-1 become Scell #1, Scell #2. That is, the service cell group is switched.

[0133] (Timing advance group)

[0134] A case where distances between the UE and each of the TRPs are different from each other also occurs in the case of utilizing multiple TRPs. Multiple TRPs can also be included in the same cell (for example, a serving cell). Or, it can also be that a certain TRP among the multiple TRPs corresponds to a serving cell and the other TRPs correspond to non-serving cells. In this case, it is also assumed that distances between each of the TRPs and the UE are different.

[0135] In the existing system, a transmission timing of an UL (Uplink) channel and / or an UL signal (UL channel / signal) is adjusted by timing advance (TA: Timing Advance). Reception timings of UL channels / signals from different user terminals (UE: User Terminal) are adjusted at a wireless base station (also referred to as a TRP: Transmission and Reception Point, a gNB: gNodeB, etc.) side.

[0136] The UE can also perform timing control of UL transmission by applying timing advance (multiple timing advance) per each timing advance group (TAG: Timing Advance Group) that is set in advance.

[0137] In the case of applying multiple timing advance, timing advance groups (TAG: Timing Advance Group) classified by transmission timing are supported. The UE assumes that the same TA offset (or, TA value) is applied per each TAG, thereby controlling UL transmission timing in each TAG. That is, the TA offset can also be set independently for each TAG.

[0138] In the case of applying multiple timing advance, by adjusting transmission timings of cells belonging to each TAG independently by the UE, even in the case of utilizing multiple cells, uplink signal reception timings from the UE can be aligned in the wireless base station.

[0139] TAGs (e.g., serving cells belonging to the same TAG) can also be configured by higher layer parameters. For serving cells belonging to the same TAG (e.g., serving cells for which UL is configured), the same timing advance value can also be applied. It can also be that a timing advance group of a SpCell containing a MAC entity is referred to as a primary timing advance group (PTAG), and a TAG other than this is referred to as a secondary timing advance group (STAG). Further, the maximum number of TAGs can also be X (e.g., X = 4) per cell group (e.g., MCG / SCG).

[0140] In the existing system (e.g., Rel. 16 NR), configuration of a maximum of 4 TAGs per cell group (e.g., MCG / SCG) is supported (refer to Figure 7 ). In Figure 7 , a case in which 3 TAGs are configured for a cell group containing a SpCell and SCells #1~#4 is shown. Here, a case in which the SpCell and SCell #1 belong to a first TAG (PTAG or TAG #0), SCell #2 and SCell #3 belong to a second TAG (TAG #1), and SCell #4 belongs to a third TAG (TAG #2) is shown.

[0141] A timing advance command (TA command) can also be notified to a UE by a MAC control element (e.g., MAC CE). The TA command is a command indicating a transmission timing value of an uplink channel, and is included in the MAC control element. The TA command (TAC) is signaled from a radio base station to a UE in a MAC layer. The UE controls a specific timer (e.g., TA timer) based on reception of the TA command.

[0142] The MAC CE for the timing advance command can also be a structure including a field for a timing advance group index (e.g., TAG ID) and a field for a timing advance command (refer to Figure 8 ). The MAC CE can also be composed of one octet (= 8 bits).

[0143] The field for the TAG ID (TAG ID field) can also be composed of, for example, 2 bits. The TAG ID field can also be used for indication of the TAG ID of the TAG for which an address is designated. The field for the timing advance command (TAC field) can also be composed of, for example, 6 bits. The TAC field can also indicate an index value T A (0, 1, 2,..., 63) for control of the amount / value of timing adjustment that a MAC entity must apply. Figure 8 The MAC CE for the timing advance command shown can also be referred to as a TAC MAC CE.

[0144] Figure 9 is another example of a MAC CE for indicating a timing advance command. Figure 9 The MAC CE shown can also be referred to as an absolute TAC MAC CE. The MAC CE can also be composed of 2 octets (= 16 bits). Specifically, the MAC CE can also include a field for a reserved bit (R-bit field) and a field for a timing advance command (TAC field). The R-bit field (R = 0) can also be composed of 4 bits, for example. The TAC field can also be composed of 12 bits across 2 octets, for example. The TAC field can also be referred to as a TA adjustment field / field for indicating a TA adjustment / field related to a TA adjustment. Figure 8 Likewise, Figure 9 The TAC field of the MAC CE can also indicate an index value for controlling the amount / value (absolute amount / absolute value) of the actual TA that the MAC entity must apply. In addition, the absolute TAC MAC CE can not include Figure 8 the TAG ID field shown.

[0145] Figure 8 The MAC CE shown can also be used after initial access is established. On the other hand, it can also be that Figure 9 The MAC CE shown is used only at initial access and is included in the RAR or the like. The fields included in the MAC CE for a timing advance command can also be referred to as TA-related fields. Among them Figure 8 The TAC field shown can also be referred to as a TA adjustment field / field for indicating a TA adjustment / field related to a TA adjustment, Figure 9 The TAC field shown can also be referred to as an absolute TAC field / field for indicating an absolute TAC.

[0146] The parameters corresponding to each TAG ID can also be set by a higher layer parameter. For example, parameters such as a time alignment timer (e.g., timeAlignmentTimer) corresponding to each TAG ID, respectively, can also be set. Alternatively, for each serving cell, the TAG ID can also be set by a higher layer parameter (e.g., tag-ID included in ServingCellConfig). In addition, after being set by a higher layer parameter, the TAG ID / parameters can also be updated by a MAC CE.

[0147] The time alignment timer can also be maintained for UL time alignment. In Rel. 17, the time alignment timer is set / associated per TAG. The UE, upon receiving a MAC CE for a timing advance command (e.g., TAC MAC CE), starts or restarts the time alignment timer associated with the indicated timing advance group (e.g., TAG), respectively.

[0148] The MAC entity receives TAC MAC CE and maintains a specific value (N) between itself and the indicated TAG. TA In the case of ), the application can either advance the timing command for the indicated TAG, or start or restart the time-aligned timer associated with the indicated TAG. Specific value (N) TA It can also be a timed advance between DL and UL.

[0149] Operations when the time alignment timer expires can also be defined separately in PTAG and STAG. Alternatively, the timing advance group (TAG) of the SpCell containing the MAC entity can be called the primary timing advance group (PTAG), and other TAGs can be called secondary timing advance groups (STAG).

[0150] For example, in Rel.17, it is also possible to support: applying a specific PTAG operation when the timer advance timer corresponding to PTAG expires, and applying a specific STAG operation when the timer advance timer corresponding to STAG expires.

[0151] For example, the following operations can also be performed when the time alignment timer expires (e.g., specific PTAG operation / specific STAG operation).

[0152] [Specific PTAG operations]

[0153] When the time alignment timer is associated with the PTAG

[0154] • Flush all HARQ buffers for all serving cells.

[0155] • When configured, notify the RRC to release the PUCCH to all serving cells.

[0156] • If configured, notify the RRC to release the SRS.

[0157] • Clear all set DL assignments and set UL assignments.

[0158] • Clear the PUSCH resource used for semi-persistent CSI reporting.

[0159] • Make all running time alignment timers expire.

[0160] • Maintain N for all tags TA .

[0161] [Specific STAG operations]

[0162] In a case where the time alignment timer is associated with the STAG,

[0163] • Flush all HARQ buffers.

[0164] • If configured, inform RRC to release PUCCH.

[0165] • If configured, inform RRC to release SRS.

[0166] • Clear all configured DL assignments and UL assignments.

[0167] • Clear PUSCH resources for semi-persistent CSI reporting.

[0168] • Maintain N TA .

[0169] (Control of UL transmission based on timing advance)

[0170] In future wireless communication systems, it is also envisaged that UL transmission is controlled based on timing advance in inter-cell mobility, for serving cells (or TRPs of serving cells) and non-serving cells / additional cells (or TRPs of non-serving cells / additional cells). Or, in future wireless communication systems, it is envisaged that different TAGs (or TAG-IDs) are configured for more than one TRP (e.g., multiple TRPs with different PCIs) corresponding to a certain cell (or CC). Or, it is also envisaged that different TRPs corresponding to a certain cell share a common TAG.

[0171] Figure 10 is a diagram showing an example of configuration of TAGs for multiple cells (or TRPs) with different PCIs.

[0172] It is also envisaged that a maximum of M PCIs (e.g., serving cell + candidate cells associated with the serving cell) can be configured per CC, and for the maximum of M PCIs, configuration of a maximum of N TAGs (e.g., N ≤ M) is supported. In this case, one or more PCIs can also be associated with one TAG.

[0173] Further, it can also be that a maximum of S serving cells within a cell group (or for a maximum of S serving cells), one or more PCIs are associated with one TAG. In this case, a maximum of T TAGs can also be configured per CC considering one PCI (Case 1). That is, a maximum of T x N TAGs can also be configured for a maximum of M x S cells. Or, a maximum of U TAGs can also be configured for a maximum of M x S cells (Case 2).

[0174] Thus, in a case where a candidate cell is configured / applied / supported, it is assumed that different serving cells / different candidate cells are associated with the same TAG. The TAG for a candidate cell can be indicated from a base station or determined by a UE based on a TA of the acquired candidate cell.

[0175] It is also considered that, for UL transmission of a UE to a candidate cell (e.g., a candidate cell having a handover to a serving cell indication), UL transmission is performed considering a TA corresponding to the candidate cell. In a case where a TA of a candidate cell is considered, the UE generates a need for acquisition of a TA of the candidate cell.

[0176] As the acquisition of a TA of a candidate cell, a plurality of TA acquisition methods such as a TA acquisition using a RACH (e.g., a RACH-based solution), a TA acquisition not using a RACH (a RACH-less solution), and the like are considered. The TA acquisition method can also be rewritten as a TA acquisition scheme, a TA acquisition type, or a TA acquisition procedure. In the present disclosure, the acquisition of a TA, the measurement of a TA, the calculation of a TA, the computation of a TA, and the determination of a TA can also be rewritten with each other.

[0177] For example, the UE can also transmit a RACH (e.g., a PDCCH ordered RACH) indicated / triggered by a PDCCH to a candidate cell, thereby acquiring a TA of the candidate cell. Information (e.g., a TA value) related to a TA of a candidate cell can also be included in a response signal (e.g., a RAR) of the RACH. The RAR can be transmitted from a serving cell or a candidate cell. Alternatively, a TA of a candidate cell can also be acquired using a UE triggered RACH or a RACH triggered from a network through a higher layer. The PDCCH order can also be triggered only through a source cell (or, a serving cell).

[0178] Alternatively, the UE can also transmit a signal other than a RACH to a candidate cell, thereby acquiring a TA of the candidate cell. Information (e.g., a TA value) related to a TA of a candidate cell can also be indicated to the UE from a base station. As the signal other than a RACH, for example, an SRS (an SRS based TA measurement) can also be applied.

[0179] Alternatively, the UE can also measure / compute / acquire the TA for the candidate cell based on the DL signals (e.g., downlink reference signals) transmitted from each cell (e.g., candidate cell / serving cell). The method by which the UE acquires the TA for the candidate cell based on the DL signals transmitted from more than one cell can also be referred to as UE based TA measurement.

[0180] In the UE based TA measurement, the downlink reference signals can also be specific DL signals (e.g., synchronization signal block (e.g., SSB) / CSI-RS, etc.). For example, the UE can also measure the difference / difference in the reception timing of the DL signals from multiple cells (or, two cells), acquire the TA of the candidate cell.

[0181] The cell that becomes the reference (e.g., serving cell) can also be included in the multiple cells. In this case, the UE can also calculate the TA required for the candidate cell based on the reception timing of the reference cell (and the TA value of the reference cell), the timing difference (e.g., T) between the reference cell and the candidate cell. The UE can also acquire the TA of the candidate cell using the timing advance command (TAC) transmitted from the serving cell.

[0182] (L1L2-triggered mobility (LTM) overview)

[0183] Figure 11 is a diagram representing the L1L2-triggered mobility (LTM) overview. The LTM, L1 / L2 inter-cell mobility can also be mutually overwritten. The UE receives the configurations related to the candidate cell (candidate cell configurations) from the NW at the time of UE reconfiguration. The UE reconfiguration includes T RRC , T proccesing1 / Tproccesing2 . T RRC (e.g., maximum 10 ms) is the processing time for the RRC reconfiguration (RRC Reconfiguration) that carries the configurations of the candidate cell (candidate configurations). T proccesing1 / Tproccesing2 (e.g., maximum 20 ms for the same FR, and maximum 40 ms for different FRs) is the time for the UE processing before and after the cell handover command, respectively. This exists in the case of including the L2 / 3 reconfiguration, RF retuning, baseband retuning, security update if necessary, etc.

[0184] DL synchronization includes T search , T Δ , T margin . T search is a time required for search of a target cell (for example, 0 ms in a case where a cell is known, and maximum 60 ms in a case where a cell is unknown). T Δ is a time for fine tracking and all timing information acquisition. T margin (for example, maximum 2 ms) is a time for post-processing of SSB and CSI-RS.

[0185] L1 measurement includes T meas (SMTC period (for example, 20 ms)). T meas is a measurement delay from target occurrence to cell handover command.

[0186] UL synchronization includes T IU , T RAR , T cmd . T IU (for example, maximum 15 ms) is a time for uncertain interruption in obtaining an initially available PRACH occasion in a new cell. T RAR (for example, maximum 4 ms) is a time for RAR delay. T cmd (for example, maximum 5 ms) is a processing time for L1 / L2 command (HARQ and paging).

[0187] T cmd after T first-data is a time for UE to perform initial DL reception / UL transmission on an indicated beam of a target cell after RAR.

[0188] Figure 12 is a diagram showing an example of PDCCH ordered RACH (PDCCH ordered RACH) with RAR monitoring. In addition, in the present disclosure, the source cell, the source cell group can also be overwritten with each other. Furthermore, the candidate cell, the candidate cell group can also be overwritten with each other.

[0189] The source cell can also transmit information related to the configuration of the candidate cell (e.g., candidate cell configuration information) to the UE. In addition, the source cell can also transmit a PDCCH order (e.g., DCI format 1_0) for PRACH triggering to the UE. It can also be that a candidate cell (e.g., one candidate cell) / random access occasion (RO) that is instructed to be the object of PRACH triggering / transmission by the PDCCH order (or, DCI). The UE transmits PRACH in the RACH procedure based on the PDCCH order to the candidate cell for TAG / TA acquisition.

[0190] Next, the source cell transmits a response signal (RAR) to PRACH to the UE. Information related to TA (e.g., TA indication) can also be included in the RAR. The RAR (e.g., PDSCH including the RAR / PDCCH scheduling the PDSCH) can also be monitored in the current serving cell, in a specific search space (e.g., common search space (CSS)) of a specific cell (e.g., SpCell) (only within the Distributed Unit (DU)). Then, in the source cell, TA adjustment (e.g., TA maintenance) is performed.

[0191] Next, the source cell can also transmit a cell handover command to the UE. In addition, TA information can also be moved / informed from the source cell to the target cell. The UE can also control UL transmission based on the acquired TA after cell handover. For example, the UE can also implement initial UL transmission using the initial TA after the initial cell handover in the case where UL synchronization of not all candidate cells has been completed.

[0192] Figure 13 is a diagram indicating an example of PDCCH order based RACH (PDCCH ordered RACH) without RAR monitoring. For Figure 13 , only the points different from Figure 12 are explained.

[0193] In Figure 13In the example of FIG. 10, the UE can be instructed to be a target of PRACH transmission by the PDCCH order for PRACH transmission. The UE can transmit PRACH in the RACH procedure to the candidate cell based on the PDCCH order. The source cell does not perform transmission of a response signal (e.g., RAR) to the PRACH. The source cell can indicate information related to the TA (e.g., TA indication) to the UE using the cell handover command.

[0194] The RAR monitoring / RAR reception can also be configured by a higher layer parameter for each candidate cell / candidate cells / all candidate cells.

[0195] In the present disclosure, the RACH without RAR can be rewritten as the RACH without RAR monitoring (e.g., RACH without RAR monitoring). The RACH can be rewritten as the PRACH transmission triggered by the PDCCH order. The RACH procedure / PRACH transmission without RAR monitoring can be rewritten as the RACH procedure / PRACH transmission without RAR monitoring, or the RACH procedure / PRACH transmission without requesting RAR monitoring.

[0196] (PDCCH order)

[0197] An example of the UE operation in the case where the network (e.g., base station) transmits the PDCCH order requesting the PRACH transmission will be described.

[0198] <Options 1>

[0199] The UE can determine the cell corresponding to the PDCCH order (or the PRACH transmitted by the PDCCH order) based on a specific parameter of the PDCCH used for the PDCCH order. The specific parameter can be, for example, a TCI state.

[0200] For example, in the case where the PDCCH (or DCI / coreset) associated with the TCI state from the non-serving cell is used for the PDCCH order for PRACH transmission by the base station, the PRACH requested by the PDCCH order corresponds to the non-serving cell. In this case, the UE can control the PRACH transmission based on the PRACH configuration of the non-serving cell. The UE can determine the TA of the non-serving cell based on the DL transmission (e.g., RAR) fed back for the PRACH transmission.

[0201] Also, in a case where the PDCCH (or, DCI / CORESET) is associated with the TCI state from the serving cell, the PRACH requested by the PDCCH order corresponds to the serving cell. In this case, the UE can also control the transmission of the PRACH based on the PRACH configuration of the serving cell. Thereafter, the UE can also determine the TA of the serving cell based on the DL transmission (e.g., RAR) fed back for the PRACH transmission.

[0202] Option 2

[0203] The UE can also determine the cell to which the PDCCH order (or, the PRACH transmitted by the PDCCH order) corresponds based on the DCI (or, CORESET) used for the PDCCH order.

[0204] For example, the UE can be informed of the identification information (e.g., cell index / cell type (e.g., serving cell / non-serving cell)) of the cell to which the PRACH corresponds in the DCI used for the PDCCH order. In a specific DCI format (e.g., DCI format 1_0) used for the PDCCH order, in order to explicitly indicate the serving cell / non-serving cell to which the PRACH corresponds, X reserved bits of the DCI can also be used for the notification of the cell. The reserved bits can also be the reserved bits included in the DCI format 1_0 in the existing system (e.g., Rel. 15 / 16).

[0205] The bit size of X can also be set / determined / decided based on the number of non-serving cells set. For example, in a case where one non-serving cell is set, X can also be 1 bit (refer to Figure 14A ). In this case, it can also be that '0' indicates the serving cell and '1' indicates the non-serving cell. For the field used for the notification of the identification information of the cell, the most significant bit (MSB) or the least significant bit (LSB) of the reserved bits can also be applied.

[0206] Further, in a case where three non-serving cells are set, X can also be 2 bits (refer to Figure 14B ). In order to indicate the non-serving cells, the indices of the non-serving cells re-indexed can also be applied. The association between the cell index and the bit value (or, codepoint) can be specified by the specification or set by the higher layer signaling, etc. For example, it can also be that the codepoint '0' or '00' indicates the serving cell. The remaining bits are associated with the index order (e.g., ascending / descending) of the non-serving cells set.

[0207] Alternatively, the size of X can also be fixed regardless of the number of configured non-serving cells without changing the number of bits. In this case, the unused bits / fields can also be configured as reserved bits.

[0208] < Option 3 >

[0209] In the case where the preamble index (e.g., ra-PreambleIndex) of random access is a specific value (e.g., 0~63), a part of the preamble can also be configured / activated by RRC / MAC CE to be associated with the non-serving cell.

[0210] In this case, the information of the serving cell / non-serving cell can also be indicated by a specific field of a specific DCI format (e.g., DCI format 1_0). The specific field can also be, for example, the random access preamble index field (e.g., Random Access Preamble index field). In addition, the preamble configuration associated with the non-serving cell can also be configured to be a structure that is applied only to PDCCH order-based PRACH transmission (or, a structure that is not applied to contention-based PRACH transmission).

[0211] In the case where the preamble associated with the non-serving cell is indicated by the DCI, the UE can also be controlled to perform PRACH transmission with the indicated preamble according to the RACH configuration of the non-serving cell.

[0212] The UE can also adjust the TA of one or more cells indicated after the PDCCH order-based PRACH. The information related to the TA can also be received through a response signal (e.g., RAR) for PRACH transmission.

[0213] (Analysis)

[0214] As described above, it is assumed in the LTM that a plurality of candidate cell IDs, one or more RO indications / preamble indications / SSBs for PRACH are indicated by one PDCCH command (DCI).

[0215] On the other hand, in the LTM, it is also assumed to support RACH without RAR monitoring (e.g., RACH without RAR monitoring). It is also considered that PRACH transmission without RAR monitoring is not called a RA procedure as in the existing system. In PRACH without RAR monitoring, the rules applied in the case with RAR monitoring are not applied.

[0216] For example, in a case where there is an ongoing RA procedure in the MAC entity, in a case where the RA without RAR monitoring is triggered (e.g., in a case where it is triggered by a PDCCH order), the UE can continue the ongoing procedure and make the PRACH transmission without RAR monitoring. Further, in a case where the UE receives a new PDCCH order for transmitting a PRACH immediately after an old PDCCH order for transmitting a PRACH (even before the UE transmits a PRACH for the old PDCCH order, or even in a case where the two PDCCH orders indicate the same preamble, mask index, and UL carrier), the UE can transmit two PRACHs according to the two PDCCH orders.

[0217] It is also envisaged that in a case where one PDCCH order (DCI) that supports triggering / indicating multiple candidate cells, the restriction that a part of the RAR reception / RAR monitoring setting is set for the multiple candidate cells that are triggered / indicated is considered. However, there has been no sufficient research on how to set / control the candidate cells that are triggered / indicated by the PDCCH order (DCI). In a case where the setting of the candidate cells that are triggered / indicated by the PDCCH order (DCI) is not properly made, inter-cell mobility cannot be properly made, and there is a concern that the quality of communication is degraded.

[0218] Therefore, the present inventors have conducted research on the candidate cells (e.g., candidate cells with / without RAR reception) that are triggered / indicated by the PDCCH order (DCI), and have conceived one example of the present embodiment. Further, the present inventors have conducted research on a case where the RA procedures of the candidate cells that are triggered / indicated by the PDCCH order (DCI) are in parallel, and have conceived another example of the present embodiment.

[0219] Hereinafter, the embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each of the following modes (e.g., each case) can be applied individually, or at least two of them can be combined.

[0220] (Variations, etc.)

[0221] In the present disclosure, "A / B" and "at least one of A and B" can also be rewritten with each other. Further, in the present disclosure, "A / B / C" can also mean "at least one of A, B, and C".

[0222] In the present disclosure, activation, deactivation, indication (or designation (indicate)), selection (select), setting (configure), update, determination (determine), and the like can also be rewritten with each other. In the present disclosure, support, control, can control, operation, can operate, and the like can also be rewritten with each other.

[0223] In the present disclosure, Radio Resource Control (RRC), RRC parameter, RRC message, higher layer parameter, information element (IE), configuration, and the like can be rewritten with each other. In the present disclosure, Medium Access Control (MAC) Control Element (CE), update command, activation / deactivation command, and the like can be rewritten with each other.

[0224] In the present disclosure, higher layer signaling can be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (for example, messages from a core network such as a protocol for positioning (for example, NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) message, and the like), and the like.

[0225] In the present disclosure, MAC signaling can be, for example, using a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), and the like. Broadcast information can be, for example, a Master Information Block (MIB), a System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (OSI), and the like.

[0226] In the present disclosure, physical layer signaling can be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0227] In the following embodiments, "a plurality of" and "two" can be rewritten with each other. In addition, "TAG" and "TAG ID" can be rewritten with each other. In addition, "cell", "CC", and "carrier" can be rewritten with each other. In the following embodiments, "calculate", "calculate", "acquire" can be rewritten with each other.

[0228] The following description can be applied to inter-cell mobility (e.g., L1 / L2 inter-cell mobility) and communication control other than inter-cell mobility. The L1 / L2 inter-cell mobility can also be rewritten as at least one of cell switching, cell switch, and cell change.

[0229] (Wireless communication method)

[0230] <First embodiment>

[0231] In the first embodiment, an example of a candidate cell triggered / instructed by a PDCCH order (or, DCI) in consideration of RAR reception / monitoring setting is described.

[0232] In a case where one or more candidate cells (or, multiple candidate cells) are triggered / instructed by one PDCCH order (or, DCI) are supported, or in a case where one or more candidate cells (or, multiple candidate cells) are triggered / instructed by one PDCCH order (or, DCI) are set, at least one of the following options 1-1 to 1-8 can be applied. The PDCCH order (or, DCI) can be rewritten as a PDCCH order DCI.

[0233] [Option 1-1]

[0234] The multiple candidate cells triggered / instructed by one PDCCH order (or, DCI) can be limited to the candidate cells set with non-RAR reception (e.g., non-RAR reception).

[0235] The candidate cell set with non-RAR reception can be rewritten as a candidate cell without RAR, a candidate cell to which a RACH without RAR is applied / set, or a candidate cell to which a RACH (e.g., RACH without RAR monitoring) without RAR monitoring is applied / set. In the present disclosure, the candidate cell set with RAR reception / non-RAR reception can be rewritten as a candidate cell with RAR, a candidate cell with RAR reception / non-RAR reception, or a candidate cell with RAR monitoring / non-RAR monitoring.

[0236] For one candidate cell set with RAR reception / monitoring, one PDCCH order (or, DCI) can be configured to be able to trigger PRACH of only one cell. In this case, separate / separated PDCCH orders (or, DCIs) can be applied to the candidate cell set with RAR reception and the candidate cell set with non-RAR reception.

[0237] For the candidate cell configured with RAR reception, one PDCCH order (or, DCI) can only trigger PRACH of one cell. Also, for the candidate cell configured with non-RAR reception, PDCCH order (or, DCI) can also support PRACH trigger of multiple cells.

[0238] For example, in the case that the bit (e.g., reserved bit) of PDCCH order (or, DCI) is used to indicate which candidate cell PRACH is transmitted to, the codepoint of candidate cell indication in PDCCH order DCI for non-RAR reception can only contain the candidate cell configured with non-RAR reception. In this case, PDCCH order for the candidate cell configured with non-RAR reception and PDCCH order for the candidate cell configured with RAR reception can also be distinguished (refer to Figure 15A 、 Figure 15B ].

[0239] Figure 15A An example of candidate cell indicated by codepoint of PDCCH order DCI corresponding to (or, indicating) the candidate cell configured with RAR reception. Each DCI codepoint can be associated with one candidate cell configured with RAR reception.

[0240] Figure 15B An example of candidate cell indicated by codepoint of PDCCH order DCI corresponding to (or, indicating) the candidate cell configured with non-RAR reception. Each DCI codepoint can be associated with one or more (or, multiple) candidate cell configured with non-RAR reception.

[0241] In this way, for the codepoint of PDCCH order DCI, the candidate cell configured with non-RAR reception supports multiple associations, and the candidate cell configured with RAR reception supports one association.

[0242] The association of each codepoint and candidate cell can be configured by higher layer parameter, or defined by specification.

[0243] In order to distinguish PDCCH order for the candidate cell configured with non-RAR reception and PDCCH order for the candidate cell configured with RAR reception, the indication based on 1-bit field (e.g., reserved bit field) of DCI, or implicit indication (e.g., indication of RAR reception DCI or non-RAR reception DCI) can also be applied.

[0244] The size of the field of the PDCCH order DCI indicating the candidate cell for which the RAR reception is set and the size of the field of the PDCCH order DCI indicating the candidate cell for which the non-RAR reception is set can also be set to be the same. In this case, the size of the field of each PDCCH order DCI can also be set to be variable based on one of the number of candidate cells for which the RAR reception is set (e.g., the maximum number) and the number of candidate cells for which the non-RAR reception is set (e.g., the maximum number) (e.g., the one with the larger maximum number). Alternatively, it can also be fixed regardless of the number of candidate cells for which the RAR reception is set / the number of candidate cells for which the non-RAR reception is set.

[0245] Alternatively, the size of the field of the PDCCH order DCI indicating the candidate cell for which the RAR reception is set and the size of the field of the PDCCH order DCI indicating the candidate cell for which the non-RAR reception is set can also be set separately (e.g., differently based on the number of candidate cells for RAR reception and the number of candidate cells for non-RAR reception, respectively). The size of the field for the indication of the candidate cell for each PDCCH order DCI can also be set to be variable based on the number of candidate cells for which the RAR reception is set (e.g., the maximum number) / the number of candidate cells for which the non-RAR reception is set (e.g., the maximum number), respectively. Alternatively, it can also be fixed regardless of the number of candidate cells for which the RAR reception is set / the number of candidate cells for which the non-RAR reception is set.

[0246] Also, in the case where the size of the field of the PDCCH order DCI indicating the candidate cell for which the RAR reception is set and the size of the field of the PDCCH order DCI indicating the candidate cell for which the non-RAR reception is set are set separately, the size of the DCI as a whole (e.g., by adding padding bits or the like) can be set to be the same.

[0247] The PDCCH order for the candidate cell for which the non-RAR reception is set and the PDCCH order for the candidate cell for which the RAR reception is set can also not be distinguished. For example, the candidate cell for which the non-RAR reception is set and the candidate cell for which the RAR reception is set can also be indicated using different code points of the same PDCCH order (or DCI) (see Figure 16 ).

[0248] In Figure 16 , it is shown that a part of the code points (here, 000, 001, 010, 011) are respectively associated with one candidate cell for which the RAR reception is set, and the remaining code points (here, 100, 101, 110, 111) are associated with one or more (or a plurality of) candidate cells for which the non-RAR reception is set.

[0249] In Figure 16In the present embodiment, a case where the number of codepoints indicating candidate cells for which RAR reception is set is the same as the number of codepoints indicating candidate cells for which non-RAR reception is set is shown, but the present embodiment is not limited thereto. The number of codepoints indicating candidate cells for which RAR reception is set can be set to be larger than the number of codepoints indicating candidate cells for which non-RAR reception is set. Alternatively, the number of codepoints indicating candidate cells for which non-RAR reception is set can be set to be larger than the number of codepoints indicating candidate cells for which RAR reception is set.

[0250] The association between each codepoint and candidate cell can be set by a higher layer parameter or can be defined by a specification.

[0251] Thus, for one DCI, the indication of candidate cells can be flexibly controlled by setting the codepoint (or the number of codepoints) corresponding to candidate cells for which RAR reception is set and the codepoint (or the number of codepoints) corresponding to candidate cells for which non-RAR reception is set.

[0252] The size of the field of the DCI for the indication of candidate cells can also be variable based on the number (e.g., the maximum number) of candidate cells for which RAR reception is set / the number (e.g., the maximum number) of candidate cells for which non-RAR reception is set. Alternatively, the size of the field of the DCI for the indication of candidate cells can be fixed regardless of the number of candidate cells for which RAR reception is set / the number of candidate cells for which non-RAR reception is set.

[0253] [Option 1-2]

[0254] Alternatively, for a plurality of candidate cells triggered / indicated by one PDCCH order (or DCI), the candidate cells for which RAR reception is set can be allowed to include at most one, and the other candidate cells can be candidate cells for which non-RAR reception is set.

[0255] For example, the candidate cells for which RAR reception is set (at most one / 1 or 0) and the candidate cells for which non-RAR reception is set (more than one) can be triggered / indicated in a bitmap form (see Figure 17A -C).

[0256] Figure 17A -C shows an example of a case where the indication of candidate cells is performed using a bitmap in a PDCCH order. In the bitmap, a specific bit (e.g., X bits) can be applied. The value (e.g., X) of the specific bit can be set by a higher layer parameter, can be indicated by a MAC CE / DCI, can be determined based on UE capability, or can be defined by a specification. For the X bits, a reserved bit / new field of a DCI can be applied.

[0257] Figure 17AAn example is shown where X is roughly equal to the number of candidate cells. Here, an example of bitmap-based candidate cell indication is shown when the number of candidate cells is 5 (or X=5). Alternatively, each bit index from 0 to X-1 can correspond to cell #0 to cell #X-1 respectively, and the candidate cell to be triggered / indicated is selected based on the bit value (0 or 1). Figure 17A The diagram shows the triggering / transmission of PRACH in cells #2 and #3, where the bit value is 1.

[0258] exist Figure 17A The diagram illustrates a mapping between bit indices and cell IDs in ascending order relative to the bit index. However, this mapping method is not limited to this. Mapping can also be performed in descending order relative to the bit index, and non-contiguous cell IDs can also be mapped.

[0259] In use Figure 17A When using a bitmap to indicate candidate cells, it is not necessary to distinguish between candidate cells with or without RAR reception. In this case, on the network side, the maximum number of candidate cells configured for RAR reception can be set to 1, while the number of candidate cells configured for non-RAR reception can be set to 1 or more, thus providing bitmap-based indication.

[0260] Figure 17B An example is shown where X is greater than the number of candidate cells configured for RAR reception. In this case, it is also possible that for each bit index, more than one candidate cell corresponds to / maps, and for a certain bit index, multiple candidate cells correspond to / map (e.g., candidate cells configured for non-RAR reception).

[0261] Different bit indices can be used for candidate cells configured for RAR reception and candidate cells configured for non-RAR reception. Alternatively, for candidate cells configured for RAR reception, only one candidate cell may be assigned for 1 bit (or one bit index). Conversely, for candidate cells configured for non-RAR reception, one or more candidate cells may be assigned for 1 bit (or one bit index).

[0262] exist Figure 17BIn the case of X = 5, the total number of candidate cells capable of triggering / indicating is 7, the number of candidate cells set for RAR reception is 2 (the number of candidate cells set for non-RA RAR reception is 5). In this case, for the candidate cells set for RAR reception, one is allocated for one bit (or bit index), and a total of two bits (or bit indexes) are used for the candidate cells set for RAR reception. For the remaining bits (or bit indexes), the candidate cells set for non-RA RAR reception are allocated. For the candidate cells set for non-RA RAR reception, one or more are allocated for one bit (or bit index).

[0263] In the case of X = 5, the total number of candidate cells capable of triggering / indicating is 7, the number of candidate cells set for RAR reception is 2 (the number of candidate cells set for non-RA RAR reception is 5). In this case, for the candidate cells set for RAR reception, one is allocated for one bit (or bit index), and a total of two bits (or bit indexes) are used for the candidate cells set for RAR reception. For the remaining bits (or bit indexes), the candidate cells set for non-RA RAR reception are allocated. For the candidate cells set for non-RA RAR reception, one or more are allocated for one bit (or bit index). Figure 17B In the case of X = 5, the total number of candidate cells capable of triggering / indicating is 7, the number of candidate cells set for RAR reception is 2 (the number of candidate cells set for non-RA RAR reception is 5). In this case, for the candidate cells set for RAR reception, one is allocated for one bit (or bit index), and a total of two bits (or bit indexes) are used for the candidate cells set for RAR reception. For the remaining bits (or bit indexes), the candidate cells set for non-RA RAR reception are allocated. For the candidate cells set for non-RA RAR reception, one or more are allocated for one bit (or bit index).

[0264] Figure 17C An example of the case where X is less than or equal to the number of candidate cells set for RAR reception (or the same as the number of candidate cells set for RAR reception) is shown. In this case, it can also be that at least one candidate cell set for RAR reception is always allocated for each bit index (or all bit indexes). In addition, it can also be that one or more candidate cells set for non-RA RAR reception are allocated for each bit index.

[0265] That is, for each bit index, a combination of at least one candidate cell set for RAR reception and one or more candidate cells set for non-RA RAR reception can be allocated. In the case of X = 5, the total number of candidate cells capable of triggering / indicating is 7, the number of candidate cells set for RAR reception is 2 (the number of candidate cells set for non-RA RAR reception is 5). In this case, for the candidate cells set for RAR reception, one is allocated for one bit (or bit index), and a total of two bits (or bit indexes) are used for the candidate cells set for RAR reception. For the remaining bits (or bit indexes), the candidate cells set for non-RA RAR reception are allocated. For the candidate cells set for non-RA RAR reception, one or more are allocated for one bit (or bit index). Figure 17C In the case of X = 5, the total number of candidate cells capable of triggering / indicating is 7, the number of candidate cells set for RAR reception is 2 (the number of candidate cells set for non-RA RAR reception is 5). In this case, for the candidate cells set for RAR reception, one is allocated for one bit (or bit index), and a total of two bits (or bit indexes) are used for the candidate cells set for RAR reception. For the remaining bits (or bit indexes), the candidate cells set for non-RA RAR reception are allocated. For the candidate cells set for non-RA RAR reception, one or more are allocated for one bit (or bit index).

[0266] The candidate cells allocated to the bitmap (or each bit index) can be set by a higher layer parameter, can be indicated by a MAC CE / DCI, or can be defined by a specification.

[0267] In addition, in the case where X is less than the number of candidate cells set for RAR reception, a number of candidate cells set for RAR reception can also be allocated for a certain bit index, and X can be selected from the candidate cells set for RAR reception (for example, X from the smallest candidate cell ID), and allocated to each bit index.

[0268] [Option 1-3]

[0269] The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be any candidate cells set for RAR reception or non-RAR reception.

[0270] [Option 1-4]

[0271] The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be all candidate cells set for non-RAR reception, or all candidate cells set for RAR reception.

[0272] [Option 1-5]

[0273] The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be candidate cells corresponding to (or, set / applied with) the same frequency.

[0274] [Option 1-6]

[0275] The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be supported to include candidate cells corresponding to (or, set / applied with) different frequencies.

[0276] [Option 1-7]

[0277] The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be supported to be associated with different TAGs. The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) are applied with different TAs.

[0278] [Option 1-8]

[0279] The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be constituted to include a serving cell. The serving cell can be a cell set as a serving cell, or can be a candidate cell that can become a serving cell (e.g., a candidate cell that can become a serving cell through cell switching), without being limited to a cell set as a serving cell.

[0280] [Option 1-9]

[0281] The multiple candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be constituted not to include a serving cell.

[0282] The options 1-1 to 1-9 can be applied individually, or two or more options can be applied in combination. In the case of combined application, the combination can be defined by the specification, or can be set by a higher layer parameter.

[0283] The maximum number of candidate cells triggered / indicated by one PDCCH order (or, DCI) can also be limited to the number set by RRC (e.g., X). The UE capability related to X can also be introduced / reported per UE / per MAC entity / per frequency.

[0284] The UE capability corresponding to each option can also be introduced. Whether the application of each option is set / allowed / activated can also be set by RRC or predefined in advance.

[0285] <Second Embodiment>

[0286] In the second embodiment, an example of a control method in a case where parallel RACH procedures are not supported in the candidate cells for which RAR reception is set is described.

[0287] The second embodiment can also be preferably applied in Option 1-1 / 1-2 of the first embodiment. Of course, the application of the second embodiment is not limited thereto.

[0288] In a case where the trigger / indication of the candidate cells for which RAR reception is set by one PDCCH order (or, DCI) is one or less, parallel RACH procedures (e.g., RACH procedures with RAR reception) can also not be supported for the candidate cells for which RAR reception is set.

[0289] For example, the UE can also determine whether parallel RACH procedures are supported based on the number of candidate cells (e.g., candidate cells with RAR reception) that can be indicated by one downlink control channel. In other words, the UE can also control to perform separate operations in the case of parallel random access procedures based on the number of candidate cells (e.g., candidate cells with RAR reception) that can be indicated by one downlink control channel.

[0290] In addition, whether parallel RACH procedures are supported / applied (or, enabled / disabled) can be set / indicated by higher layer signaling / MAC CE / DCI, or can be defined by specification.

[0291] In a case where parallel RACH procedures (e.g., RACH procedures with RAR reception) are not supported for the candidate cells for which RAR reception is set, the UE operation can also be controlled based on at least one of the following Options 2-1~2-3.

[0292] [Option 2-1]

[0293] In a case where there already exists an ongoing RA procedure for the candidate cell / service cell for which the RAR reception is configured, the UE can also not expect / envisage that a new RA procedure for the candidate cell / service cell for which the RAR reception is configured is triggered (cf. Figure 18 ). In addition, the triggering of a new RA procedure for the candidate cell for which the non-RAR reception is configured can also be allowed.

[0294] In Figure 18 , it is shown that in a case where a first RA procedure (e.g., PRACH) is triggered for the candidate cell / service cell for which the RAR reception is configured, during which the first RA procedure is ongoing, the new RA procedure (second RA procedure) for the candidate cell / service cell for which the RAR reception is configured is controlled so as not to be triggered. On the other hand, during the first RA procedure is ongoing, the triggering of a new RA procedure (third RA procedure) for the candidate cell / service cell for which the non-RAR reception is configured can also be allowed.

[0295] Thereby, it is possible to control that the RA procedures for which the RAR reception is generated (e.g., multiple RAR receptions) do not overlap / overlap, whereby an increase of the UE processing load caused by the complication of the RA procedures can be suppressed.

[0296] [Option 2-2]

[0297] In a case where there already exists an ongoing RA procedure for the candidate cell / service cell for which the RAR reception is configured, and a new RA procedure with RAR reception is triggered, it can also be controlled to conduct one RA procedure (cf. Figure 19 ). That is, it can also be controlled (e.g., one RA procedure is selected) so as to conduct only one RA procedure at a time. As to which RA procedure is conducted (e.g., the ongoing RA procedure is continued or the new RA procedure is started), it can also be autonomously judged / determined by the UE (UE implementation: UE implementation). In addition, the overlap (or, parallel RACH procedures) of the RA procedure for the candidate cell / service cell for which the RAR reception is configured and the RA procedure for the candidate cell for which the non-RAR reception is configured can also be allowed.

[0298] In Figure 19In the case where a first RA procedure (e.g., PRACH) is triggered for a candidate cell / service cell for which RAR reception is set, and a new RA procedure (second RA procedure) for the candidate cell / service cell for which RAR reception is set is triggered during the first RA procedure is ongoing, either one of the RA procedures can be selected (e.g., whether to continue the ongoing RA procedure or start a new RA procedure) based on a certain rule / condition, and the selected RA procedure can be controlled to be performed only.

[0299] Thus, the RA procedure for which RAR reception is generated (e.g., multiple RAR receptions) can be controlled not to overlap / overlap, and an increase in UE processing load due to complication of the RA procedure can be suppressed. Further, the RA procedure to be continued can be flexibly determined at the UE side.

[0300] [Option 2-3]

[0301] In the case where a new RA procedure with RAR reception is triggered while there is an ongoing RA procedure for a candidate cell / service cell for which RAR reception is set, one of the RA procedures can be controlled to be performed based on a certain rule / condition (refer to Figure 20 ). The UE can also be controlled to prioritize one of the RA procedures based on a certain rule / condition. In addition, overlap (or parallel RACH procedures) of the RA procedure for the candidate cell / service cell for which RAR reception is set and the RA procedure for the candidate cell for which non-RAR reception is set can be allowed.

[0302] In Figure 20 , the case where a first RA procedure (e.g., PRACH) is triggered for a candidate cell / service cell for which RAR reception is set, and a new RA procedure (second RA procedure) for the candidate cell / service cell for which RAR reception is set is triggered during the first RA procedure is ongoing is shown. In this case, either one of the RA procedures can be selected (e.g., whether to continue the ongoing RA procedure or start a new RA procedure) based on a certain rule / condition, and the selected RA procedure can be controlled to be performed only.

[0303] The certain rule / condition can be determined based on at least one of (or a combination of two or more) the order of indication of the RA procedure, the cell type, the cell ID, and the TAG ID. For example, the RA procedure that is triggered / indicated later can be prioritized. The RA procedure for the service cell can be prioritized over the RA procedure for the candidate cell. In the case where the RA procedures for the candidate cells overlap each other, the candidate cell with a smaller cell ID can be prioritized, or the candidate cell with a smaller TAG ID can be prioritized. The prioritization rule is not limited thereto.

[0304] Thereby, it is possible to control so that the RA procedures (e.g., multiple RAR receptions) resulting in RAR receptions do not overlap / overlap, thereby it is possible to suppress an increase in UE processing load caused by complication of the RA procedures. Further, it is possible to appropriately decide the continued RA procedure based on a certain rule / condition.

[0305] In each option, parallel with the new RACH procedure with non-RAR reception can also be supported. The maximum number of RACH procedures that can be parallel can be defined by the specification, or can be supported as a UE capability (e.g., per UE / per MAC entity / per frequency).

[0306] In a case where the RACH procedure based on the RAR reception and the new RACH procedure based on the non-RAR reception are made parallel, whether or not the parallel of the RA procedures is allowed / applied / activated can be defined in advance, can be set by RRC, or can be decided based on the report of the UE capability.

[0307] <Third Embodiment>

[0308] In the third embodiment, an example of a control method in a case where parallel RACH procedures are supported in the candidate cells in which the RAR reception is set (and the serving cell in which the RAR reception is set) is described.

[0309] The third embodiment can also be preferably applied in the options 1-3 / 1-4 of the first embodiment. Of course, the application of the second embodiment is not limited thereto.

[0310] In a case where the trigger / indication of the candidate cell in which the RAR reception is set by one PDCCH order (or, DCI) is 1 or more, parallel RACH procedures (e.g., RACH procedures with RAR reception) can also be supported for the candidate cell in which the RAR reception is set.

[0311] For example, the UE can also judge whether or not the parallel RACH procedures are supported based on the number of the candidate cells (e.g., candidate cells with RAR reception) that can be indicated by one downlink control channel. In other words, the UE can also control so that separate operations are performed in a case where the random access procedures are parallel based on the number of the candidate cells (e.g., candidate cells with RAR reception) that can be indicated by one downlink control channel.

[0312] Further, whether or not the parallel RACH procedures are applied (or, enabled / disabled) can be set / indicated by the higher layer signaling / MAC CE / DCI, or can be defined in the specification.

[0313] In a case where parallel RACH procedures (e.g., RACH procedures with RAR reception) are supported for the candidate cell where RAR reception is configured, in a case where two parallel RACH procedures are ongoing, an operation of indicating to the UE which RAR is targeted for which RA procedure / which RA procedure the RAR is intended for can also be supported. For the candidate cell where RAR reception is configured, in a case where parallel RACH procedures (e.g., RACH procedures with RAR reception) are supported, for example, at least one of the following Option 3-1 ~ Option 3-2 can also be applied.

[0314] [Option 3-1]

[0315] In a case where RAR reception is ongoing in a specific cell (e.g., SpCell), a time period where RAR windows overlap can also be supported. Also, in a case where there is RAR reception in a time period where RAR windows overlap, the RAR can also include a new indication of the candidate cell ID / TAG ID for indicating the associated RA procedure / candidate cell.

[0316] Thereby, even in a case where multiple RA procedures (e.g., RAR reception) overlap, the UE can determine the association of each RA procedure (or, each RAR) with the candidate cell ID / TAG ID.

[0317] [Option 3-2]

[0318] A RAR reception for each candidate cell can also be supported based on a specific type (e.g., Type 1) of CSS configuration (type 1 CSS configuration (type1-CSS configuration)). In this case, the associated RA procedure / candidate cell can also be implicitly indicated by the specific type of CSS configuration. The association of the CSS and the RA procedure / candidate cell can be configured by a higher layer parameter or can be defined by the specification. Thereby, even in a case where multiple RA procedures (e.g., RAR reception) overlap, the UE can determine the association of each RA procedure (or, each RAR) with the candidate cell ID / TAG ID.

[0319] In Option 3-1 / 3-2, for parallel RACH procedures (e.g., RACH procedures with RAR reception), several restrictions / conditions can also be further considered. For example, a UE capability related to the maximum number of parallel RACH procedures (e.g., per UE / per MAC entity / per frequency) can also be introduced. In addition, parallel RACH procedures can be limited only between candidate cells (or, only between candidate cells each other), or only between a candidate cell and a serving cell.

[0320] <supplement>

[0321] [Notification of information to UE]

[0322] The notification of arbitrary information from the network (Network (NW)) (e.g., Base Station (BS)) to the UE (in other words, the reception of arbitrary information from the BS in the UE) in the above-described embodiments can also be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0323] In a case where the above-described notification is performed by a MAC CE, the MAC CE can also be identified by including a new Logical Channel ID (LCID) that is not specified in the existing standard in a MAC subheader.

[0324] In a case where the above-described notification is performed by a DCI, the above-described notification can also be performed by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in scrambling of cyclic redundancy check (CRC) bits imparted to the DCI, a format of the DCI, and the like.

[0325] Further, the notification of arbitrary information to the UE in the above-described embodiments can also be performed periodically, semi-persistently, or aperiodically.

[0326] [Notification of information from UE]

[0327] The notification of arbitrary information from the UE (to the NW) (in other words, the transmission / reporting of arbitrary information to the BS in the UE) in the above-described embodiments can also be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0328] In a case where the above-described notification is performed by a MAC CE, the MAC CE can also be identified by including a new LCID that is not specified in the existing standard in a MAC subheader.

[0329] In a case where the above notification is made by UCI, the above notification can also be transmitted using PUCCH or PUSCH.

[0330] Further, the notification of any information from the UE in the above-described embodiments can also be made periodically, semi-persistently, or aperiodically.

[0331] [Application of Each Embodiment]

[0332] At least one of the above-described embodiments can also be applied in a case where a specific condition is satisfied. The specific condition can be specified in a standard or notified to the UE / BS using higher layer signaling / physical layer signaling.

[0333] At least one of the above-described embodiments can also be applied only to a UE that reports or supports a specific UE capability.

[0334] The specific UE capability can also indicate at least one of the following:

[0335] • Support for a specific process / operation / control / information (e.g., random access procedure / PRACH transmission without RAR monitoring) for at least one of the above-described embodiments.

[0336] • Support for a RACH procedure for a candidate cell without RAR (e.g., a candidate cell for which RAR is not received).

[0337] • Support for a parallel RA procedure.

[0338] Further, the above-described specific UE capability can be a capability that is applied across the entire frequency (commonly regardless of the frequency), a capability per frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), a capability per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), a capability per SubCarrier Spacing (SCS), or a capability per Feature Set or Feature Set Per Component-carrier (FSPC).

[0339] Moreover, the above-described specific UE capability can be a capability that is applied commonly irrespective of the duplexing mode (commonly irrespective of the duplexing mode) and a capability for each duplexing mode (for example, Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0340] Moreover, at least one of the above-described embodiments can also be applied in a case where the UE is configured / activated / triggered by higher layer signaling / physical layer signaling with specific information associated with the above-described embodiments (or implements the operation of the above-described embodiments). For example, the specific information can also be information indicating that the random access procedure / PRACH transmission without RAR monitoring is activated, an arbitrary RRC parameter for a specific version (for example, Rel. 18 / 19), and the like.

[0341] The UE can also apply, for example, the Rel. 15 / 16 operation in a case where at least one of the above-described specific UE capability is not supported, or the above-described specific information is not configured.

[0342] (Postscript)

[0343] With regard to an embodiment of the present disclosure, the following invention is postscripted.

[0344] [Postscript 1-1]

[0345] A terminal characterized by comprising:

[0346] a reception unit that receives a downlink control channel that supports triggering of a random access preamble (PRACH) with respect to a plurality of candidate cells; and

[0347] a control unit that determines, on the basis of the downlink control channel, one or more candidate cells in which the PRACH is to be transmitted, the plurality of candidate cells including a first candidate cell in which monitoring of a response signal (RAR) with respect to the PRACH is performed and a second candidate cell in which monitoring of the RAR with respect to the PRACH is not performed.

[0348] [Postscript 1-2]

[0349] the terminal described in Postscript 1-1,

[0350] the first candidate cell and the one or more second candidate cells are indicated by one of the downlink control channels.

[0351] [Postscript 1-3]

[0352] the terminal described in Postscript 1-1 or Postscript 1-2,

[0353] The first candidate cell and the second candidate cell are indicated by using different code points of a specific field of downlink control information transmitted using the downlink control channel.

[0354] [Para 1-4]

[0355] The terminal of any one of Para 1-1 to Para 1-3,

[0356] The first candidate cell and the second candidate cell are indicated by using a bitmap included in downlink control information transmitted using the downlink control channel.

[0357] [Para 2-1]

[0358] The terminal has:

[0359] a reception unit that receives a downlink control channel supporting triggering of a random access preamble (PRACH) for a plurality of candidate cells; and

[0360] a control unit that, based on the downlink control channel, judges one or more candidate cells that perform transmission of the PRACH,

[0361] the plurality of candidate cells include a first candidate cell having monitoring of a response signal (RAR) for the PRACH and a second candidate cell not having monitoring of the RAR for the PRACH, and the control unit, based on the number of the first candidate cells that can be indicated by one of the downlink control channels, controls so that separate operations are performed in the case of parallel random access procedures.

[0362] [Para 2-2]

[0363] The terminal of Para 2-1,

[0364] In the case where the number of the first candidate cells that can be indicated by one of the downlink control channels is at most 1, the control unit assumes that a new random access procedure for another first candidate cell having the RAR monitoring is not triggered while a random access procedure for a first candidate cell having the RAR monitoring or a serving cell is in progress.

[0365] [Para 2-3]

[0366] The terminal of Para 2-1 or Para 2-2,

[0367] In a case where the number of the first candidate cells that can be indicated by one of the downlink control channels is maximum 1, the control unit selects one random access procedure based on a specific condition in a case where a new random access procedure for another first candidate cell or a serving cell with the RAR monitoring is triggered while a random access procedure for a first candidate cell or a serving cell with the RAR monitoring is in progress.

[0368] [Para 2-4]

[0369] the terminal of any one of Para 2-1 to Para 2-3,

[0370] In a case where a plurality of the first candidate cells are supported by the indication by one of the downlink control channels, a plurality of random access procedures are in progress, and the information related to the association of the RAR with the random access procedure or the information related to the association of the RAR with the first candidate cell is received.

[0371] (wireless communication system)

[0372] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0373] Figure 21 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (may be simply referred to as system 1) can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0374] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0375] In EN-DC, the base station of LTE (E-UTRA) (eNB) is a master node (MN), and the base station of NR (gNB) is a secondary node (SN). In NE-DC, the base station of NR (gNB) is an MN, and the base station of LTE (E-UTRA) (eNB) is an SN.

[0376] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity of both an MN and an SN being base stations of NR (NR-NR Dual Connectivity (NN-DC))).

[0377] The wireless communication system 1 can also have a base station 11 that forms a macro cell C1 with a wide coverage, and a base station 12 (12a-12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 can also be located within at least one cell. The configuration, number, and the like of the cells and the user terminal 20 are not limited to the manner shown in the drawing. Hereinafter, without distinguishing between the base stations 11 and 12, the base stations 10 are collectively referred to.

[0378] The user terminal 20 can also be connected to at least one of the multiple base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0379] Each of the CCs can also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell Cl can also be included in the FR1, and the small cell C2 can also be included in the FR2. For example, the FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and the FR2 can also be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited to these, and for example, the FR1 can also correspond to a frequency band higher than the FR2.

[0380] Furthermore, the user terminal 20 can also communicate in each of the CCs using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0381] The plurality of base stations 10 can also be connected through wired (for example, optical fiber based on Common Public Radio Interface (CPRI), X2 interface, or the like) or wireless (for example, NR communication). For example, in a case where NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 corresponding to a higher station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) can also be referred to as an IAB node.

[0382] The base station 10 can also be connected to a core network 30 via another base station 10 or directly. The core network 30 can also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), or the like, for example.

[0383] The core network 30 can also include, for example, a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), an Operation, Administration and Maintenance (OAM), and the like network functions (NFs). Also, a plurality of functions can be provided by one network node. Further, communication with an external network (e.g., the Internet) can be performed via a DN.

[0384] The user terminal 20 can also be at least one terminal supporting a communication scheme of LTE, LTE-A, 5G, or the like.

[0385] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of Downlink (DL) and Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like can also be used.

[0386] The radio access scheme can also be referred to as a waveform. Further, in the radio communication system 1, other radio access schemes (for example, other single carrier transmission schemes, other multicarrier transmission schemes) can also be used in the radio access schemes of the UL and the DL.

[0387] In the radio communication system 1, as the downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and the like, which are shared among the user terminals 20, can also be used.

[0388] Further, in the radio communication system 1, as the uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like, which are shared among the user terminals 20, can also be used.

[0389] Through the PDSCH, user data, higher layer control information, a System Information Block (SIB), and the like, can be transmitted. Through the PUSCH, user data, higher layer control information, and the like, can also be transmitted. Further, through the PBCH, a Master Information Block (MIB) can also be transmitted.

[0390] Through the PDCCH, lower layer control information can also be transmitted. The lower layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0391] Further, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, and the like, and the DCI that schedules the PUSCH can also be referred to as a UL grant, a UL DCI, and the like. Further, the PDSCH can also be rewritten as DL data, and the PUSCH can also be rewritten as UL data.

[0392] In the detection of the PDCCH, a control resource set (CORESET) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area and a search method of the PDCCH candidate. One CORESET can also be associated with one or a plurality of search spaces. The UE can also monitor the CORESET associated with the search space based on a search space setting.

[0393] One search space can also correspond to the PDCCH candidate equivalent to one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", and the like of the present disclosure can also be rewritten to each other.

[0394] At least one uplink control information (Uplink Control Information (UCI)) including channel state information (Channel State Information (CSI)), delivery confirmation information (for example, also referred to as a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, and the like), and a scheduling request (Scheduling Request (SR)) can also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through the PRACH.

[0395] In addition, in the present disclosure, "downlink", "uplink", and the like can also be described without "link". Furthermore, "Physical" can also be described without the beginning of various channels.

[0396] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like can also be transmitted.

[0397] The synchronization signal can be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), or the like. In addition, the SS, the SSB, and the like can also be referred to as a reference signal.

[0398] Furthermore, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), and the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0399] (BASE STATION)

[0400] Figure 22is a drawing showing an example of a structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface 140. Note that the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 can each be provided more than one.

[0401] In the present example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and it is also conceivable that the base station 10 has other functional blocks required for wireless communication. Part of the processing of each unit described below can also be omitted.

[0402] The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured of a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0403] The control unit 110 can also control generation of signals, scheduling (for example, resource allocation, mapping), and the like. The control unit 110 can also control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, a sequence, and the like transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0404] The transmission / reception unit 120 can include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 can include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be configured of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0405] The transmission / reception unit 120 can be configured as an integrated transmission / reception unit, or can be configured of a transmission unit and a reception unit. The transmission unit can be configured of the transmission processing unit 1211 and the RF unit 122. The reception unit can be configured of the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0406] The transmission / reception antenna 130 can be constituted by an antenna such as an array antenna and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0407] The transmission / reception unit 120 can also transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 120 can also receive the uplink channel, the uplink reference signal, and the like described above.

[0408] The transmission / reception unit 120 can also form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

[0409] The transmission / reception unit 120 (transmission processing unit 1211) can also generate a bit string to be transmitted, for example, by performing processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 110.

[0410] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing of channel coding (which can include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-analog conversion, and the like, with respect to the bit string to be transmitted, and output a baseband signal.

[0411] The transmission / reception unit 120 (RF unit 122) can also perform modulation to a wireless band, filter processing, amplification, and the like, with respect to the baseband signal, and transmit a signal of the wireless band via the transmission / reception antenna 130.

[0412] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to a baseband signal, and the like, with respect to a signal of the wireless band received by the transmission / reception antenna 130.

[0413] The transmission / reception unit 120 (reception processing unit 1212) can also apply, to the acquired baseband signal, reception processing such as analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as necessary), filter processing, demapping, demodulation, decoding (which can also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like, and acquire user data and the like.

[0414] The transmission / reception unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, and the like, based on the received signal. The measurement unit 123 can also perform measurements with respect to received power (for example, Reference Signal Received Power (RSRP)), received quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like. The measurement results can also be output to the control unit 110.

[0415] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between apparatuses included in the core network 30 (for example, network nodes that provide NFs), other base stations 10, and the like, and can acquire, transmit, and the like, user data (user plane data), control plane data, and the like, for the user terminals 20.

[0416] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0417] The transmission / reception unit 120 can also transmit a downlink control channel that supports triggering of a random access preamble (PRACH) for multiple candidate cells. The control unit 110 can also instruct, based on the downlink control channel, one or more candidate cells to perform transmission of the PRACH. The multiple candidate cells can include a first candidate cell that has monitoring of a response signal (RAR) for the PRACH, and a second candidate cell that does not have monitoring of the RAR for the PRACH.

[0418] The control unit 110 can also control so that separate operations are performed by the terminal in the case of parallel random access procedures, based on the number of first candidate cells that can be instructed by one downlink control channel (or, a specific higher layer parameter).

[0419] (user terminal)

[0420] Figure 23 is a diagram that shows an example of a structure of a user terminal according to an embodiment. The user terminal 20 is provided with a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 can be provided.

[0421] In addition, in this example, mainly functional blocks of characteristic parts in the present embodiment are shown, and it can also be assumed that the user terminal 20 has other functional blocks necessary for wireless communication. Part of the processing of each unit described below can also be omitted.

[0422] The control unit 210 performs control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like, which can be described based on common knowledge in the technical field to which the present disclosure pertains.

[0423] The control unit 210 can also control generation, mapping, and the like of signals. The control unit 210 can also control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, and the like transmitted as signals, and forward them to the transmission / reception unit 220.

[0424] The transmission / reception unit 220 can include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can include a transmission processing unit 2211, a reception processing unit 2212. The transmission / reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which can be described based on common knowledge in the technical field to which the present disclosure pertains.

[0425] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be configured of a transmission unit and a reception unit. The transmission unit can be configured of the transmission processing unit 2211, the RF unit 222. The reception unit can be configured of the reception processing unit 2212, the RF unit 222, the measurement unit 223.

[0426] The transmission / reception antenna 230 can be configured of an antenna such as an array antenna, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0427] The transmission / reception unit 220 can also receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 220 can also transmit the above-described uplink channel, uplink reference signal, and the like.

[0428] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like, to form at least one of a transmission beam and a reception beam.

[0429] The transmission / reception unit 220 (transmission processing unit 2211) can also, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), and the like, on data, control information, and the like, acquired from the control unit 210, to generate a bit string to be transmitted.

[0430] The transmission / reception unit 220 (transmission processing unit 2211) can also perform channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, digital-analog conversion, and the like, on the bit string to be transmitted, to output a baseband signal.

[0431] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), in a case where transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can perform DFT processing as the above-described transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and in a case where this is not so, the transmission / reception unit 220 (transmission processing unit 2211) can not perform DFT processing as the above-described transmission processing.

[0432] The transmission / reception unit 220 (RF unit 222) can also perform modulation to a radio frequency band, filter processing, amplification, and the like, on the baseband signal, to transmit a signal of the radio frequency band via the transmission / reception antenna 230.

[0433] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, and the like with respect to a signal of a wireless band received through the transmission / reception antenna 230.

[0434] The transmission / reception unit 220 (reception processing unit 2212) can also acquire user data and the like by applying, with respect to the acquired baseband signal, reception processing such as analog-digital conversion, FFT processing, IDFT processing (as necessary), filter processing, demapping, demodulation, decoding (which can also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing.

[0435] The transmission / reception unit 220 (measurement unit 223) can also perform measurement related to a received signal. For example, the measurement unit 223 can also perform RRM measurement, CSI measurement, and the like based on a received signal. The measurement unit 223 can also perform measurement with respect to received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result can also be output to the control unit 210.

[0436] In addition, the measurement unit 223 can also derive channel measurement for CSI calculation based on a channel measurement resource. The channel measurement resource can also be, for example, a Non Zero Power (NZP) CSI-RS resource. Furthermore, the measurement unit 223 can also derive interference measurement for CSI calculation based on an interference measurement resource. The interference measurement resource can also be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, and the like. In addition, the CSI-IM can also be referred to as a CSI-Interference Management (IM), and can also be overwritten with a Zero Power (ZP) CSI-RS.

[0437] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0438] The transmission / reception unit 220 can also receive a downlink control channel supporting triggering of a random access preamble (PRACH) for a plurality of candidate cells. The control unit 210 can also determine one or more candidate cells for which the PRACH is transmitted, based on the downlink control channel. The plurality of candidate cells can include a first candidate cell having monitoring of a response signal (RAR) for the PRACH and a second candidate cell not having the monitoring of the RAR for the PRACH.

[0439] It can also be that the first candidate cell and the one or more second candidate cells are indicated by one downlink control channel. The first candidate cell and at least one of the second candidate cells can also be indicated using different code points of a specific field of downlink control information transmitted using the downlink control channel. The first candidate cell and at least one of the second candidate cells can also be indicated by a bitmap included in the downlink control information transmitted using the downlink control channel.

[0440] The control unit 210 can also control so that separate operations are performed in the case of parallel random access procedures, based on the number of first candidate cells that can be indicated by one downlink control channel (or a specific higher layer parameter).

[0441] It can also be that, in the case where the number of first candidate cells that can be indicated by one downlink control channel is at most one, the control unit 210 assumes that a new random access procedure for another first candidate cell having RAR monitoring or a serving cell is not triggered while a random access procedure for a first candidate cell having RAR monitoring or the serving cell is in progress.

[0442] It can also be that, in the case where the number of first candidate cells that can be indicated by one downlink control channel is at most one, the control unit 210 selects one random access procedure based on a specific condition in the case where a new random access procedure for another first candidate cell having RAR monitoring or a serving cell is triggered while a random access procedure for a first candidate cell having RAR monitoring or the serving cell is in progress.

[0443] It can also be that, in the case where the indication of a plurality of first candidate cells is supported by one downlink control channel and a plurality of random access procedures are in progress, information related to association of a RAR with a random access procedure or information related to association of a RAR with a first candidate cell is received.

[0444] (Hardware structure)

[0445] Further, the block diagrams used in the description of the embodiments above illustrate functional units. These functional units (structural units) are implemented by any combination of hardware and software, and the implementation method of each functional unit is not particularly limited. That is, each functional unit can be implemented by one device physically or logically integrated, or by two or more devices physically or logically separated and connected directly or indirectly (for example, by wire, wireless, or the like). Each functional unit can be implemented by combining the above one device or the above plurality of devices with software.

[0446] Here, among the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that implements a transmission function can also be referred to as a transmitting unit, a transmitter, or the like. Any one of these is as described above, and the implementation method is not particularly limited.

[0447] For example, the base station, the user terminal, and the like in an embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 24 is a diagram that shows an example of a hardware structure of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0448] Further, in the present disclosure, the terms of device, circuit, equipment, section, unit, and the like can be rewritten with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the diagram, or can be configured not to include a part of the devices.

[0449] For example, the processor 1001 is only illustrated one, but there can be a plurality of processors. Further, the processing can be executed by one processor, or the processing can be executed by two or more processors simultaneously, sequentially, or with other methods. In addition, the processor 1001 can be realized by one or more chips.

[0450] As for each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into the processor 1001, the memory 1002, and the like hardware, the processor 1001 performs an operation and controls communication via the communication device 1004, or by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0451] The processor 1001, for example, enables an operating system to operate to control the entire computer. The processor 1001 can also be constituted by a central processing device (Central Processing Unit (CPU)) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, at least a part of the above-described control unit 110 (210), the transmission and reception unit 120 (220), and the like can also be realized by the processor 1001.

[0452] Further, the processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processing according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) can also be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be applied to other functional blocks.

[0453] The memory 1002 can also be a computer-readable recording medium, for example, constituted by at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other appropriate storage medium. The memory 1002 can also be referred to as a register, a cache, a main storage (main storage device), and the like. The memory 1002 can hold a program (program code), a software module, and the like that can be executed in order to implement a wireless communication method related to an embodiment of the present disclosure.

[0454] The storage 1003 can also be a computer-readable recording medium such as at least one of a flexible disc, a floppy (registered trademark) disc, a magneto-optical disc (e.g., a compact disc read-only memory (CD-ROM) and the like), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disc, a hard disc drive, an intelligent disk (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and the like. The storage 1003 can also be referred to as an auxiliary storage device.

[0455] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, also referred to as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The above-described transceiver 120 (220), a transceiver antenna 130 (230), and the like can also be implemented by the communication device 1004. The transceiver 120 (220) can also be implemented by a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0456] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from an outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, and the like) that performs an output to an outside. In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (e.g., a touch panel).

[0457] Furthermore, the processor 1001, the memory 1002, and the like are connected through a bus 1007 for communicating information. The bus 1007 can be configured with a single bus, or different buses can be configured between the devices.

[0458] Furthermore, the base station 10 and the user terminal 20 can also be configured to include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), or the like hardware, and a part or all of each functional block can also be implemented using the hardware. For example, the processor 1001 can also be implemented using at least one of these hardware.

[0459] (Modified example)

[0460] In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure can also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (a signal or signaling) can also be rewritten with each other. In addition, a signal can also be a message. A reference signal (RS) can also be simply referred to as RS, and can also be referred to as a pilot, a pilot signal, or the like depending on the applied standard. In addition, a component carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

[0461] A radio frame can also be configured by one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) configuring the radio frame can also be referred to as a subframe. Further, a subframe can also be configured by one or more slots in the time domain. A subframe can also be a fixed time length (for example, 1 ms) independent of numerology.

[0462] Here, numerology can also be a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, numerology can also indicate at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering processing performed by a transmitter-receiver in the frequency domain, a specific windowing processing performed by the transmitter-receiver in the time domain, or the like.

[0463] A slot can also be composed of one or a plurality of symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and the like) in the time domain. Furthermore, a slot can also be a time unit based on a numerology.

[0464] A slot can also include a plurality of mini-slots. Each mini-slot can also be composed of one or a plurality of symbols in the time domain. Furthermore, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0465] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit for transmitting a signal. A radio frame, a subframe, a slot, a mini-slot, and a symbol can also be referred to by other names respectively corresponding thereto. In addition, a time unit of a frame, a subframe, a slot, a mini-slot, a symbol, and the like in the present disclosure can also be overwritten with each other.

[0466] For example, one subframe can also be referred to as a TTI, a plurality of consecutive subframes can also be referred to as a TTI, one slot or one mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. In addition, a unit representing a TTI can also not be referred to as a subframe, but can be referred to as a slot, a mini-slot, or the like.

[0467] Here, a TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling of allocating a radio resource (a frequency bandwidth, a transmission power, and the like that can be used in each user terminal) to each user terminal in a TTI unit. In addition, the definition of a TTI is not limited thereto.

[0468] A TTI can also be a transmission time unit of a data packet (a transport block), a code block, a codeword, and the like that have been channel-encoded, and can also become a processing unit of scheduling, link adaptation, and the like. In addition, when a TTI is given, a time interval (for example, a number of symbols) to which a transport block, a code block, a codeword, and the like are actually mapped can be shorter than the TTI.

[0469] In addition, in a case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) can also be a minimum time unit of scheduling. In addition, the number of slots (mini-slots) constituting the minimum time unit of scheduling can also be controlled.

[0470] A TTI having a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0471] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be rewritten as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be rewritten as a TTI having a TTI length of less than a long TTI and a TTI length of 1 ms or more.

[0472] A resource block (Resource Block (RB)) is a resource allocation unit in a time domain and a frequency domain, and can also include one or more contiguous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB can also be the same regardless of a numerology, for example, can also be 12. The number of subcarriers included in the RB can also be determined based on a numerology.

[0473] In addition, the RB can also include one or more symbols in the time domain, and can also be a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be constituted by one or more resource blocks, respectively.

[0474] In addition, one or more RBs can also be referred to as a physical resource block (Physical RB (PRB)), a subcarrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0475] In addition, a resource block can also be constituted by one or more resource elements (Resource Element (RE)). For example, one RE can also be a wireless resource area of one subcarrier and one symbol.

[0476] The Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a certain carrier. Here, common RBs can also be determined by the index of RBs based on the common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0477] A BWP can also include a UL BWP (the BWP used by UL) and a DL BWP (the BWP used by DL). For a UE, one or more BWPs can also be set within a single carrier.

[0478] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Additionally, terms such as "cell" and "carrier" in this disclosure may be replaced with "BWP".

[0479] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0480] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0481] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0482] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0483] Furthermore, information, a signal, and the like can be output in at least one of physical (hard) and logical (soft) forms. The information, the signal, and the like can be output via a plurality of network nodes.

[0484] The information, the signal, and the like that are input and output can be stored in a specific location (for example, a memory) and can be managed using a management table. The information, the signal, and the like that are input and output can be overwritten, updated, or added. The information, the signal, and the like that are output can be deleted. The information, the signal, and the like that are input can be transmitted to another device.

[0485] The notification of the information is not limited to the manners / embodiments described in the present disclosure and can be performed using other methods. For example, the notification of the information in the present disclosure can also be implemented by physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (for example, Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), and the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0486] In addition, the physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Furthermore, the RRC signaling can also be referred to as an RRC message, for example, can also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, and the like. In addition, the MAC signaling can also be notified using a MAC Control Element (CE), for example.

[0487] Furthermore, the notification of specific information (for example, the notification of “X is”) is not limited to explicit notification and can be performed implicitly (for example, by not performing the notification of the specific information or by the notification of other information).

[0488] The determination can be made by a value represented by one bit (0 or 1), by a true or false value (Boolean) represented by true or false, or by comparison of numerical values (for example, comparison with a specific value).

[0489] Software, regardless of being referred to as software, firmware, middle-ware, micro-code, hardware description language, or by other names, should be interpreted broadly to mean instructions, instruction sets, code (code), code segments, program code (program code), programs (programs), sub-programs (sub-programs), software modules (software modules), applications (applications), software applications (software applications), software packages (software packages), routines (routines), sub-routines (sub-routines), objects, executable files, execution threads, procedures, functions, and the like.

[0490] Furthermore, software, instructions, information, and the like can also be transmitted and received via a transmission medium. For example, in the case where software is transmitted from a website, a server, or other remote source (remote source) using at least one of wired technology (coaxial cable, optical fiber cable, twisted pair cable, Digital Subscriber Line (DSL), and the like) and wireless technology (infrared rays, microwaves, and the like), at least one of these wired technology and wireless technology is included in the definition of the transmission medium.

[0491] The terms "system" and "network" used in the present disclosure can be used interchangeably. The "network" can also mean a device (for example, a base station) included in the network.

[0492] In the present disclosure, the terms of “precoding”, “precoder”, “weight (precoding weight)”, “Quasi-Co-Location (QCL)”, “Transmission Configuration Indication state (TCI state)”, “spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, “antenna port”, “layer”, “number of layers”, “rank”, “resource”, “resource set”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel”, “UE panel”, “transmitting entity”, “receiving entity”, and the like can be used interchangeably.

[0493] In addition, in the present disclosure, the antenna port can also be mutually rewritten with the antenna port for any signal / channel (e.g., DeModulation Reference Signal (DMRS) port). In the present disclosure, the resource can also be mutually rewritten with the resource for any signal / channel (e.g., reference signal resource, SRS resource, and the like). In addition, the resource can also include time / frequency / symbol / space / power resource. Furthermore, the spatial domain transmission filter can also include at least one of spatial domain transmission filter and spatial domain reception filter.

[0494] The above group, for example, can also include at least one of a spatial relation group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a COntrol REsource SET (CORESET) group, a PUCCH group, an antenna port group (e.g., DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0495] Furthermore, in the present disclosure, the beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, Codeword (CW), Transport Block (TB), RS, and the like can also be mutually rewritten.

[0496] Also, in the present disclosure, TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, and the like can be rewritten to each other.

[0497] Also, in the present disclosure, "QCL", "QCL assumption", "QCL relationship", "QCL type information", "QCL property / properties", "property of a specific QCL type (e.g., Type A, Type D)", "a specific QCL type (e.g., Type A, Type D)", and the like can be rewritten to each other.

[0498] In the present disclosure, index, identifier (Identifier (ID)), indicator, indication, resource ID, and the like can be rewritten to each other. In the present disclosure, sequence, list, set, group, cluster, cluster, subset, and the like can be rewritten to each other.

[0499] Also, spatial relation information Identifier (ID) (TCI state ID) and spatial relation information (TCI state) can be rewritten to each other. The "spatial relation information (TCI state)" can also be rewritten to "a set of spatial relation information (TCI state)", "one or more spatial relation information", and the like. TCI state and TCI can also be rewritten to each other. Spatial relation information and spatial relation can also be rewritten to each other.

[0500] In the present disclosure, the terms "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. There are also cases where the base station is referred to with the terms macro cell, small cell, femto cell, pico cell, and the like.

[0501] A base station can accommodate one or plural (for example, three) cells. In a case where a base station accommodates plural cells, the coverage area of the base station as a whole can be divided into plural smaller areas, and each of the smaller areas can also be provided with communication services by a base station subsystem (for example, a small-sized base station for indoor use (Remote Radio Head (RRH))). The term “cell” or “sector” refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services in the coverage area.

[0502] In the present disclosure, the matter of a base station transmitting information to a terminal can also be overridden by the matter of the base station instructing the terminal to control / operate based on the information.

[0503] In the present disclosure, the terms “Mobile Station (MS)”, “user terminal”, “User Equipment (UE)”, “terminal”, and the like can be used interchangeably.

[0504] There are also cases where a mobile station is called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or several other appropriate terms.

[0505] At least one of a base station and a mobile station can also be called a transmission device, a reception device, a wireless communication device, and the like. In addition, at least one of a base station and a mobile station can also be a device mounted on a moving object, a moving object body, and the like.

[0506] The moving object refers to a movable object, and the moving speed is arbitrary, and of course, a case where the moving object is stopped is also included. The moving object includes, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a Connected Car, a shovel, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a handcart, a rickshaw, a ship (a ship and other watercraft), an airplane, a rocket, an artificial satellite, a drone, a multicopter, a quadcopter, a hot air balloon, and an object mounted thereon, but is not limited to these. In addition, the moving object can also be a moving object that autonomously travels based on a travel instruction.

[0507] The mobile body can be a vehicle (for example, a car, an airplane, and the like), a mobile body that moves in a manner without a person (for example, a drone, a self-driving vehicle, and the like), or a robot (with a person or without a person). In addition, at least one of the base station and the mobile station also includes an apparatus that does not necessarily move at the time of a communication operation. For example, at least one of the base station and the mobile station can also be a sensor or the like, an Internet of Things (IoT) device.

[0508] Figure 25 FIG. 1 is a diagram that shows an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, front wheels 46 on the left and right, rear wheels 47 on the left and right, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0509] The drive unit 41 is configured by at least one of an engine, a motor, a hybrid of an engine and a motor, for example. The steering unit 42 is configured to include at least a steering wheel (also referred to as a handle), and to steer at least one of the front wheels 46 and the rear wheels 47 based on an operation of the steering wheel operated by a user.

[0510] The electronic control unit 49 is configured by a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an Input / Output (I / O) port) 63. Signals from the various sensors 50 to 58 included in the vehicle are input to the electronic control unit 49. The electronic control unit 49 can also be referred to as an Electronic Control Unit (ECU).

[0511] As signals from the various sensors 50-58, there are the following signals and the like: a current signal from the current sensor 50 that senses the current of the motor, a rotational speed signal of the front wheel 46 / rear wheel 47 acquired by the rotational speed sensor 51, an air pressure signal of the front wheel 46 / rear wheel 47 acquired by the air pressure sensor 52, a vehicle speed signal acquired by the vehicle speed sensor 53, an acceleration signal acquired by the acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by the accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 acquired by the brake pedal sensor 56, an operation signal of the shift lever 45 acquired by the shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, and the like acquired by the object detection sensor 58.

[0512] The information service unit 59 is constituted by various devices for providing (outputting) various information such as driving information, traffic information, entertainment information, and the like for a navigation system, an audio system, a speaker, a display, a television, a radio, and one or more ECUs that control these devices. The information service unit 59 provides various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40 using information acquired from external devices via the communication module 60 and the like.

[0513] The information service unit 59 can include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, and the like) that accepts input from the outside, and can include an output device (for example, a display, a speaker, an LED lamp, a touch panel, and the like) that implements output to the outside.

[0514] The drive assist system unit 64 is constituted by a millimeter wave radar, a Light Detection and Ranging (LiDAR), a camera, a positioning detector (for example, a Global Navigation Satellite System (GNSS), and the like), map information (for example, a High Definition (HD) map, an Autonomous Vehicle (AV) map, and the like), a gyro system (for example, an Inertial Measurement Device (Inertial Measurement Unit (IMU)), an Inertial Navigation Device (Inertial Navigation System (INS)), and the like), an Artificial Intelligence (AI) chip, an AI processor, and the like, which are various devices for providing a function for preventing an accident or reducing a driving burden of a driver, and one or more ECUs that control these devices. Further, the drive assist system unit 64 transmits and receives various information via the communication module 60, and realizes a drive assist function or an autonomous driving function.

[0515] The communication module 60 is capable of communicating with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the microprocessor 61 and the memory (ROM, RAM) 62, and various sensors 50-58 in the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the front wheels 46, the rear wheels 47, the axle 48, and the electronic control unit 49 provided in the vehicle 40 via the communication port 63.

[0516] The communication module 60 is capable of being controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device capable of communicating with an external device. For example, various information is transmitted and received between the external device via wireless communication. The communication module 60 can be inside and outside the electronic control unit 49. The external device can be, for example, the base station 10, the user terminal 20, and the like described above. Further, the communication module 60 can be, for example, at least one of the base station 10 and the user terminal 20 described above (may function as at least one of the base station 10 and the user terminal 20).

[0517] The communication module 60 can also transmit at least one of the signals from the various sensors 50-58 described above input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, and the like can also be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 can also contain information based on the above input.

[0518] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, and the like) transmitted from an external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 can also be referred to as an output unit that outputs information (for example, outputs information to a display, a speaker, and the like based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60) to a device.

[0519] Further, the communication module 60 stores various information received from an external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the front wheels 46 on the left and right, the rear wheels 47 on the left and right, the axles 48, the various sensors 50-58, and the like provided in the vehicle 40.

[0520] Further, the base station in the present disclosure can also be rewritten as a user terminal. For example, the structures in which the communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (for example, can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), and the like) can also apply the various modes / embodiments of the present disclosure. In this case, it can also be configured to have the functions of the base station 10 described above by the user terminal 20. Further, the terms such as "uplink", "downlink", and the like can also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, the uplink channel, the downlink channel, and the like can also be rewritten as a sidelink channel.

[0521] Likewise, the user terminal in the present disclosure can also be rewritten as a base station. In this case, it can also be configured to have the functions of the user terminal 20 described above by the base station 10.

[0522] In the present disclosure, actions by a base station are sometimes also performed by an upper node thereof depending on the situation. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited to these), or a combination thereof.

[0523] The modes / embodiments explained in the present disclosure can be used alone or in combination, and can also be used in switching as execution proceeds. Furthermore, the processing procedure, timing, flowchart, and the like of the modes / embodiments explained in the present disclosure can also be changed in order as long as there is no contradiction. For example, for the methods explained in the present disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0524] The modes / embodiments explained in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is an integer, a fraction)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended, modified, created, or specified based on them, and the like. Furthermore, a plurality of systems can also be combined (for example, LTE or LTE-A, in combination with 5G, and the like) and applied.

[0525] The recitation "based on" used in the present disclosure does not mean "only based on" unless specifically written. In other words, the recitation "based on" means both "only based on" and "at least based on".

[0526] Any reference to an element or apparatus using a designation such as "first," "second," and the like, does not generally limit the quantity or order of those elements, nor does it limit the positional properties thereof. Such designations can be used herein as a convenient method of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element.

[0527] The term "determining" used in the present disclosure encompasses a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, searching, looking up (such as looking up in a table, a database or another data structure), ascertaining and the like. Also, "determining" can include receiving (such as receiving information), accessing (such as accessing data in a memory), and the like.

[0528] Also, "determining" can include resolving, selecting, choosing, establishing and the like.

[0529] That is, "determining" can include the action of contacting some action. Also, "determining" can be replaced with "assuming," "expecting," "considering," and the like. In the present disclosure, "determining" can be replaced with the above operations.

[0530] Also, in the present disclosure, "determining" can be replaced with "assuming," "expecting," "considering," and the like. Also, in the present disclosure, "not assuming to perform" can be replaced with "assuming not to perform."

[0531] In the present disclosure, "expect" can also be mutually rewritten with "be expected". For example, "expect(s)..." (the "..." can also be expressed by that clause, to infinitive, and the like) can also be mutually rewritten with "be expected...". "Does not expect..." can also be mutually rewritten with "be not expected...". Furthermore, "An apparatus A is not expected..." can also be mutually rewritten with "A device B other than the apparatus A does not expect... " (for example, in the case where the apparatus A is a UE, the device B can also be a base station).

[0532] The "maximum transmission power" described in the present disclosure can mean the maximum value of the transmission power, can mean the nominal maximum transmission power (the nominal UE maximum transmission power), or can mean the rated maximum transmission power (the rated UE maximum transmission power).

[0533] The term "connected", "coupled" or all variations of them, used in the present disclosure, or all variations thereof, means all of the connections or couplings between two or more elements directly or indirectly, and can include the case where one or more intermediate elements exist between the two elements "connected" or "coupled" with each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can also be rewritten as "access".

[0534] In the present disclosure, in the case where two elements are connected, it can be considered that they are "connected" or "coupled" with each other using one or more wires, cables, printed electric connections, and the like, and as several non-limiting and non-inclusive examples, using electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, the light (both visible and non-visible) region, and the like.

[0535] In the present disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, the term can also mean "A and B are different from C, respectively". The terms "separate", "couple", and the like can also be interpreted in the same manner as "different".

[0536] In the present disclosure, in the case where "include", "including", and variations thereof are used, these terms are used in the same sense as the term "comprising". Further, in the present disclosure, the term "or" does not mean the exclusive sense.

[0537] In the present disclosure, in the case where a definite article such as a, an, and the is added by translation, for example, in English, the present disclosure can also include the case where the noun following the definite article is plural.

[0538] In the present disclosure, "below", "less than", "above", "more than", "equal to", and the like can also be rewritten with each other. Further, in the present disclosure, words meaning "good", "bad", "large", "small", "high", "low", "early", "late", "wide", "narrow", and the like are not limited to the original, comparative, and superlative, and can also be rewritten with each other. Further, in the present disclosure, words meaning "good", "bad", "large", "small", "high", "low", "early", "late", "wide", "narrow", and the like, as expressions to which "the ith" (i is an arbitrary integer) is added, are not limited to the original, comparative, and superlative, and can also be rewritten with each other (for example, "highest" can also be rewritten with "the ith highest").

[0539] In the present disclosure, "of", "for", "regarding", "related to", "associated with", and the like can also be rewritten with each other.

[0540] In the present disclosure, "when A, B", "if A, (then) B", "B upon A", "B in response to A", "B based on A", "B during / while A", "B before A", "B at (the same time as) / on A", "B after A", "B since A", "B until A", and the like can be rewritten each other. In addition, A, B, and the like here can be replaced with a noun, a gerund, a general sentence, and the like as appropriate according to the context. In addition, the time difference between A and B can be approximately 0 (immediately after or immediately before). Furthermore, a time offset can be applied to the time at which A occurs. For example, "A" can be rewritten with "A occurs with a time offset before / after". The time offset (for example, one or more symbols / slots) can be predetermined or determined by the UE based on notified information.

[0541] In the present disclosure, timing, time, time instance, arbitrary time unit (for example, slot, sub-slot, symbol, subframe), period, occasion, resource, and the like can be rewritten each other.

[0542] The above has been described in detail for the inventions related to the present disclosure, but the inventions related to the present disclosure are obviously not limited to the embodiments described in the present disclosure for those skilled in the art. The description of the present disclosure is for the purpose of illustration and does not have any limiting meaning on the inventions related to the present disclosure.

Claims

1. A terminal, characterized by comprising: Having: a receiving unit that receives a downlink control channel that supports triggering of a random access preamble (PRACH) for a plurality of candidate cells; and a control unit that determines, based on the downlink control channel, one or more candidate cells in which the PRACH is to be transmitted, the plurality of candidate cells including a first candidate cell that has monitoring of a response signal (RAR) for the PRACH and a second candidate cell that does not have monitoring of the RAR for the PRACH.

2. The terminal according to claim 1, wherein the first candidate cell and the one or more second candidate cells are indicated by one of the downlink control channels up to a maximum of one.

3. The terminal according to claim 1, wherein the first candidate cell and at least one of the second candidate cells are indicated using different code points of a specific field of downlink control information transmitted using the downlink control channel.

4. The terminal according to claim 1, wherein the first candidate cell and at least one of the second candidate cells are indicated using a bitmap included in downlink control information transmitted using the downlink control channel.

5. A wireless communication method of a terminal, the method comprising: Having: a step of receiving a downlink control channel that supports triggering of a random access preamble (PRACH) for a plurality of candidate cells; and a step of determining, based on the downlink control channel, one or more candidate cells in which the PRACH is to be transmitted, the plurality of candidate cells including a first candidate cell that has monitoring of a response signal (RAR) for the PRACH and a second candidate cell that does not have monitoring of the RAR for the PRACH.

6. A base station, characterized by Having: a transmitting unit that transmits a downlink control channel that supports triggering of a random access preamble (PRACH) for a plurality of candidate cells; and a control unit that indicates, based on the downlink control channel, one or more candidate cells in which the PRACH is to be transmitted, the plurality of candidate cells including a first candidate cell that has monitoring of a response signal (RAR) for the PRACH and a second candidate cell that does not have monitoring of the RAR for the PRACH.

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