Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure comprises: a reception unit that receives, in certain units, a specific configuration for accessing a specific cell; and a control unit that controls access to the specific cell on the basis of the specific configuration.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

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

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] Incidentally, in existing cellular systems, switching of RRC reconfiguration can be performed on a per PCI (physical cell ID) basis.

[0006] For example, in an L3 handover, the PCI is switched based on the RRC reconfiguration transmitted from the base station (Example 1). Also, in the LTM of Rel. 18, the candidate cell is configured by the RRC reconfiguration. In this case, when a cell switch is instructed by a MAC CE (e.g., a cell switch command), the UE switches the RRC reconfiguration.

[0007] On the other hand, whether or not different RRC [re]configurations are applied (or are required) for each PCI depends on the situation. That is, there may be cases where different configurations are required for each PCI and cases where they are not required.

[0008] It is necessary to clarify the RRC configuration method for these cases, as communication throughput (reduction of communication overhead) may be affected if this is not clarified.

[0009] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can perform flexible communication while reducing communication overhead.

[0010] A terminal according to one aspect of the present disclosure has a receiving unit that receives specific settings for accessing a specific cell in specific units, and a control unit that controls access to the specific cell based on the specific settings.

[0011] According to one aspect of the present disclosure, flexible communication can be performed while reducing communication overhead.

[0012] Figure 1A is a diagram showing an example of UE mobility in Rel. 17. Figure 1B is a diagram showing an example of UE mobility in Rel. 18. Figure 2 is a diagram showing an example of the Rel. 18 LTM (Long-Term Management) procedure. Figures 3A and 3B are diagrams showing an overview of MIMO. Figure 4A is a diagram showing an overview of a cellular system. Figure 4B is a diagram showing an overview of a cell-free system. Figures 5A to 5C are diagrams showing examples of overviews of various assumed cell-free configurations. Figure 6 is a diagram showing an example of a pattern of one PCI component. Figures 7A to 7E are diagrams showing an example of a first cell configuration. Figure 8 is a diagram showing an example of a pattern of one area component. Figure 9A is a diagram showing an example of a first / second cell configuration according to Option 1-1. Figure 9B is a diagram showing an example of a first / second cell configuration according to Option 1-2. Figure 10A is a diagram showing an example of a first / second cell configuration according to Option 2 / 4-1. FIG. 10B is a diagram showing an example of the configuration of the first / second cell according to Option 2 / 4-2. FIG. 11A is a diagram showing an example of the configuration of the first / second cell according to Option 3 / 5-1. FIG. 11B is a diagram showing an example of the configuration of the first / second cell according to Option 3 / 5-2. FIGS. 12A to 12C are diagrams showing an example of the configuration of the second cell. FIG. 13 is a diagram showing an example of a change in the configuration of the second cell. FIG. 14 is a diagram showing an example of RRC configuration according to the first embodiment. FIGS. 15A and 15B are diagrams showing an example of RRC configuration according to the first embodiment. FIG. 16 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 17 is a diagram showing an example of the configuration of a base station according to an embodiment. FIG. 18 is a diagram showing an example of the configuration of a user terminal according to an embodiment. FIG. 19 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 20 is a diagram showing an example of a vehicle according to an embodiment.

[0013] (L1 / L2 Inter-Cell Mobility) It is being considered that a UE performs UL transmission to one or more cells / TRPs. The following scenario 1 or scenario 2 can be considered as a procedure in this case. In the present disclosure, the term "serving cell" may be replaced with the TRP in the serving cell. The terms "layer 1 / layer 2 (L1 / L2)" and "DCI / Medium Access Control Control Element (MAC CE)" may be interchangeable. In the present disclosure, a physical cell identity (PCI) different from the physical cell identity (PCI) of the current serving cell may be simply referred to as a "different PCI." The terms "non-serving cell," "cell having a different PCI," and "additional cell" may be interchangeable.

[0014] <Scenario 1> Scenario 1 corresponds to, for example, multi-TRP inter-cell mobility, but may be a scenario that does not correspond to multi-TRP inter-cell mobility.

[0015] (1) The UE receives from the serving cell the SSB configuration for beam measurement of the TRP corresponding to a PCI different from that of the serving cell, and the configuration required to use radio resources for data transmission and reception (including resources of the different PCI). (2) The UE performs beam measurement of the TRP corresponding to the different PCI and reports the beam measurement results to the serving cell. (3) Based on the above report, the Transmission Configuration Indication (TCI) state associated with the TRP corresponding to the different PCI is activated by L1 / L2 signaling from the serving cell. (4) The UE transmits and receives using a UE-dedicated channel on the TRP corresponding to the different PCI. (5) The UE must always cover the serving cell, including in the case of multiple TRPs. As in conventional systems, the UE must use common channels from the serving cell, such as the Broadcast Control Channel (BCCH) and the Paging Channel (PCH).

[0016] In Scenario 1, when the UE transmits and receives signals to and from an additional cell / TRP (a TRP corresponding to the PCI of the additional cell), the serving cell (the serving cell assumption in the UE) is not changed. The UE is configured with higher layer parameters related to the PCI of non-serving cells from the serving cell. Scenario 1 may be applied, for example, in Rel. 17.

[0017] Figure 1A shows an example of UE movement in Rel. 17. Assume that the UE moves from a cell (serving cell) with PCI #1 to a cell (additional cell) with PCI #3 (which overlaps with the serving cell). In this case, Rel. 17 does not support switching of serving cells via L1 / L2.

[0018] The additional cell is a cell that has an additional PCI different from the PCI of the serving cell. The UE can receive / transmit a UE-dedicated channel (UE-dedicated CH) from the additional cell. On the other hand, the UE needs to be within the coverage of the serving cell to receive UE common channels (e.g., system information / paging / short messages). When the UE moves out of the coverage of the serving cell, a cell switch (e.g., a process such as RRC reconfiguration) is required due to handover (also called L3 mobility).

[0019] <Scenario 2> Scenario 2 applies L1 / L2 inter-cell mobility (e.g., L1L2-triggered mobility (LTM)). L1 / L2 inter-cell mobility enables the serving cell to be changed using functions such as beam control without RRC reconfiguration. In other words, transmission and reception with a candidate cell / additional cell is possible without handover. Since handover requires RRC reconnection and creates a period when data communication is unavailable, applying L1 / L2 inter-cell mobility that does not require handover makes it possible to continue data communication even when the serving cell is changed. Scenario 2 may be applied, for example, in Rel. 18. In scenario 2, for example, the following procedure is performed.

[0020] (1) The UE receives configuration information (e.g., SSB configuration, etc.) for a cell with a different PCI (additional cell / candidate cell / target serving cell) from the serving cell (current serving cell) for beam measurement / serving cell change. (2) The UE performs beam measurement of the cell using the different PCI and reports the measurement results to the serving cell. (3) The UE may receive the configuration of the cell with a different PCI (serving cell / candidate cell configuration) via higher layer signaling (e.g., RRC). That is, pre-configuration for the serving cell change may be performed. This configuration may be performed together with the configuration in (1) or separately. (4) Based on the above report, the TCI state of the cell with the different PCI may be activated via L1 / L2 signaling according to the serving cell change. The activation of the TCI state and the serving cell change may be performed separately. (5) The UE changes the serving cell (assumed serving cell) and starts receiving / transmitting using the pre-configured UE-specific channel and TCI state.

[0021] That is, in Scenario 2, the serving cell (the serving cell assumed by the UE) is updated by L1 / L2 signaling. Scenario 2 may be applied in Rel. 18.

[0022] Figure 1B shows an example of UE mobility in Rel. 18. In Rel. 18, the serving cell is switched by L1 / L2 (e.g., DCI / MAC CE). Here, the example shows a case where the serving cell is switched from PCI #1 corresponding to the current serving cell (e.g., current serving cell) to PCI #3 corresponding to the target serving cell (e.g., target serving cell) by L1 / L2 signaling.

[0023] The UE can receive / transmit common channels (e.g., system information / paging / short messages) / UE-dedicated channels to / from the new serving cell (target serving cell #3), which may cause the UE to move out of the coverage of the previous serving cell PCI #1.

[0024] (L1L2-triggered mobility (LTM) in Rel. 18) FIG. 2 is a diagram showing an example of LTM considered in Rel. 18. Here, the steps of LTM are shown, including LTM preparation (e.g., LTM preparation), early synchronization (e.g., early sync), LTM execution (e.g., LTM execution), and LTM completion (e.g., LTM completion), but the LTM steps are not limited to these. Some steps (or operations included in steps) may be omitted, the order of operations included in some steps may be reversed with other operations included in other steps, or other steps (or other operations) may be added. Note that in the present disclosure, early synchronization may be read as synchronization.

[0025] <LTM Preparation> In LTM preparation, a UE RRC-connected to a serving cell (e.g., a UE in RRC_CONNECTED) transmits a measurement report. The measurement report may be an L3 measurement report. The base station (or source base station / serving cell) prepares an LTM candidate (e.g., LTM candidate preparation) based on the measurement report transmitted from the UE.

[0026] The base station performs LTM candidate configuration (e.g., LTM candidate configuration) through RRC (e.g., RRC reconfiguration). Information about candidate cells may be configured in the UE through the LTM candidate configuration.

[0027] <Early sync> The UE performs early synchronization (e.g., early sync) with a candidate cell. DL / UL early synchronization with a candidate cell may be performed by the UE after RRC configuration (e.g., RRC reconfiguration) of the LTM candidate cell. UL early synchronization may be performed after measurement (e.g., L1 measurement) or measurement report (e.g., L1 measurement report) transmission in the LTM implementation step.

[0028] <LTM Execution> The UE performs measurements (e.g., L1 measurements) on the configured candidate cells and transmits a measurement report. The measurement report may be an L1 measurement report. The base station (or source base station / serving cell) makes an LTM decision (e.g., an LTM decision) based on the measurement report transmitted from the UE. The base station transmits a cell switch command (e.g., a MAC CE) to the UE.

[0029] The UE may perform a cell switch by a cell switch command (e.g., MAC CE). For example, based on the cell switch command, the UE may detach from a source (e.g., source cell) and apply the target configurations of the target cell.

[0030] After receiving the cell switch command, the UE may perform a random access procedure. For example, if the UE does not have a valid timing advance for the target cell / candidate cell (or a destination cell), the UE may perform the random access procedure to obtain a TA value for the target cell. On the other hand, if the UE has a valid timing advance (TA) for the target cell / candidate cell (or a destination cell), the UE may not perform the random access procedure (or may omit / skip the random access procedure).

[0031] The UE operation for TA acquisition for the target cell / candidate cell (or a cell to which switching is to be performed) may be performed before receiving the cell switch command. For TA acquisition for the candidate cell, at least one of a plurality of TA acquisition methods, such as TA acquisition using RACH (e.g., RACH-based solutions) and TA acquisition without using RACH (RACH-less solutions), may be supported.

[0032] For TA acquisition using RACH, a method with RAR monitoring and a method without RAR monitoring may be supported. A TA acquisition method may be interpreted as a TA acquisition scheme, a TA acquisition type, or a TA acquisition procedure. In the present disclosure, TA acquisition, TA measurement, TA calculation, TA computation, and TA determination may be interpreted as interchangeable terms.

[0033] For example, the UE may acquire the TA of a candidate cell by transmitting a RACH (e.g., a PDCCH ordered RACH) indicated / triggered by the PDCCH to the candidate cell. Information about the TA of the candidate cell (e.g., a TA value) may be included in a response signal (e.g., an RAR) of the RACH. The RAR may be transmitted from the serving cell or the candidate cell. Alternatively, the TA of the candidate cell may be acquired using a RACH triggered by the UE or a RACH triggered by a higher layer from the network. The PDCCH order may be triggered only by the source cell (or the serving cell).

[0034] Alternatively, the UE may acquire the TA of the candidate cell by transmitting a signal other than the RACH to the candidate cell. Information about the TA of the candidate cell (e.g., the TA value) may be indicated to the UE from the base station. As the signal other than the RACH, for example, the SRS may be applied (e.g., SRS-based TA measurement).

[0035] Alternatively, the UE may measure / calculate / obtain the TA for the candidate cell based on DL signals (e.g., downlink reference signals) transmitted from each cell (e.g., candidate cell / serving cell). A method in which the UE obtains the TA for the candidate cell based on DL signals transmitted from one or more cells may be called UE-based TA measurement.

[0036] In the UE-based TA measurement, the downlink reference signal may be a predetermined DL signal (e.g., a synchronization signal block (e.g., SSB) / CSI-RS, etc.). For example, the UE may measure the difference / difference in reception timing of DL signals from multiple cells (or two cells) and obtain the TA of the candidate cell.

[0037] The multiple cells may include a reference cell (e.g., a serving cell). In this case, the UE may 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) and the timing difference between the reference cell and the candidate cell. The UE may acquire the TA of the candidate cell using a timing advance command (TAC) transmitted from the serving cell. Note that TA acquisition without using RACH may also be performed before receiving a cell switch command. TA acquisition may also be performed during UL synchronization (e.g., early UL synchronization).

[0038] <LTM Completion> The UE may complete the LTM cell switch procedure by sending a predetermined message to the target cell / candidate cell. The predetermined message may be an RRC reconfiguration complete message (e.g., an RRCReconfigurationComplete message).

[0039] In the case of RACH-based LTM, the UE may determine that the LTM implementation has been completed successfully if the random access procedure has been completed successfully.

[0040] In the case of RACH-less (e.g., RACH-less) LTM, the UE may determine that the LTM has been successfully performed if the UE determines that the network has successfully received the first UL data. For example, in the case of RACH-less LTM, the UE may transmit the first data to the target cell along with sending an RRC reconfiguration complete message. The UE may determine that the first UL data has been successfully received by receiving a PDCCH in the target cell that addresses the UE's C-RNTI. This PDCCH corresponds to the PDCCH that schedules a new transmission following the first UL data.

[0041] (Conditional Handover (CHO)) This section describes conditional handover (CHO) in Rel. 16 and later. CHO is applied to, for example, non-terrestrial networks (NTN). In NTN, the following additional trigger conditions are supported for the UE to perform CHO to a candidate cell: Radio Resource Management (RRM) measurement-based event A4. Time-based trigger conditions. Location-based trigger conditions.

[0042] A time-based or location-based trigger condition is always configured together with one of the measurement-based trigger conditions (CHO events A3 / A4 / A5 described below). How the UE evaluates the time-based or location-based trigger conditions together with the RRM measurement-based events is up to the UE implementation.

[0043] (Rel. 18 LTM and Rel. 16 CHO) While the above-mentioned LTM (e.g., Rel. 18 LTM) supports early sync / early L1 measurement report, CHO (e.g., Rel. 16 CHO) does not support early sync / early measurement report. In LTM, mobility decisions are made by the network (based on L1 beam reports), whereas in CHO, they are made by the UE (based on L3 measurements and CHO conditions).

[0044] In LTM, a MAC CE for cell switch command is sent from the base station to the UE. In CHO, the UE starts evaluating the CHO implementation conditions for the candidate cells after receiving the CHO configuration through RRC signaling. After deciding on mobility (or cell switch), RACH is required in CHO, but RACH may not be required in LTM.

[0045] (Cell-free) Existing wireless communication systems (e.g., 5G NR) have adopted a cellular system in which one cell is formed by one antenna / transmitting / receiving point (TRP). The area formed by the cell is fixed / static.

[0046] <Distributed MIMO> In addition, existing wireless communication systems (for example, Rel. 16 and later) have introduced distributed multi-input multi-output (Distributed MIMO, for example, multi-TRP using multiple TRPs), which forms a communication area using the coverage of multiple antennas / TRPs. Distributed MIMO allows simultaneous communication using multiple antennas / TRPs and communication using one antenna / TRP.

[0047] By adopting distributed MIMO, it is possible to create a more favorable line-of-sight environment and improve MIMO performance.

[0048] 3A and 3B are diagrams illustrating an overview of MIMO. Fig. 3A illustrates an example of co-located MIMO. In co-located MIMO, one UE communicates with one antenna / TRP.

[0049] On the other hand, Figure 3B illustrates an example of distributed MIMO, in which one UE communicates with multiple antennas / TRPs in cooperation with each other.

[0050] <Comparison of Cellular / Cell-Free Systems> In future wireless communication systems (e.g., Rel. 20 and later), the introduction of cell-free communication is being considered with the aim of further improving performance and energy efficiency through reducing interference between multiple antennas / TRPs, creating a line-of-sight environment for high-frequency use, improving frequency utilization efficiency throughout the system, and applying uniform, high-quality communication to each user.

[0051] Self-Free may also be referred to as cell-free massive MIMO (mMIMO) or large-scale distributed MIMO (D-MIMO). Self-Free uses coherent cooperation of multiple access points. Self-Free may include at least one of ultra-dense deployment, scalable cooperation, user-centric clustering, super-carrier aggregation, and analog fronthaul. The user plane for cell-free may perform more flexible scheduling than existing scheduling. The control plane for cell-free may maintain some form of cell to facilitate signaling.

[0052] In cell-free, unlike conventional cellular systems, one area (which may be called a cell / sub-cell, etc.) may be formed by multiple antennas / TRPs. In other words, the area may mean a cell that is independent of the location of the antenna / TRP.

[0053] In cell-free, the set of antennas / TRPs used to form a coverage area may be changed according to the needs of UEs. For example, the set of antennas / TRPs may be changed based on the number of UEs, the number of traffic, communication purposes (e.g., initial access, data communication, measurement, reporting, etc.), etc., rather than the coverage of the antennas / TRPs.

[0054] In other words, in cell-free, the coverage between multiple antennas / TRPs may overlap.

[0055] In cell-free mode, the direction in which a synchronization signal (which may also be called, for example, a synchronization signal block (SSB), a synchronization signal / physical broadcast channel (SS / PBCH) block, etc.) is transmitted may be controlled for each antenna / TRP.

[0056] In addition, in cell-free, a central unit (CU) / distributed unit (DU) may be virtualized for each antenna, or each antenna may be managed by only the CU.

[0057] Fig. 4A is a diagram showing an overview of a cellular system, in which cells formed by each antenna / TRP are shown, and UEs communicate based on these cells.

[0058] On the other hand, Figure 4B is a diagram showing an overview of a cell-free system. In the example shown in Figure 4B, the installed antennas / TRPs do not form fixed / static cells in a cellular system. As shown in Figure 4B, in a cell-free system, one or more antennas / TRPs form areas according to conditions. Therefore, in a cell-free system, each antenna / TRP does not need to correspond to the same physical cell ID, and the areas between multiple antennas / TRPs may overlap.

[0059] Self-regulation may be achieved, for example, by coordinating a set of antennas / TRPs controlled by a central control unit (e.g., CU).

[0060] In a cell-free system, a first cell (which may be called, for example, a cell / super cell / macro cell / large cell, etc.) with a fixed physical range like a cell in a 5G NR system, and a second cell (which may be called, for example, a subcell / area / micro cell / cell / small cell / second cell within the first cell, etc.) with a quasi-static / dynamic physical range that varies based on conditions may be formed.

[0061] For example, a first cell may be referred to as a supercell to distinguish it from a second cell. When a supercell is composed of multiple second cells, the second cells may have the same definition / operation / coverage as existing cells in NR. For example, a second cell may be referred to as a subcell to distinguish it from a first cell. When a supercell or a cell is composed of multiple subcells, the subcells may have the same definition / operation / coverage as existing cells in NR.

[0062] The first cell may be a cell that is newly defined in a future wireless communication system, or may be a cell defined in an existing wireless communication system that is reused.

[0063] <Example of cell-free configuration> The configuration of the first cell and the second cell can be considered as follows: Assumption 1 and 2: Assumption 1: The first cell is composed of multiple TRPs with one cell ID (physical cell ID (PCI)). The multiple TRPs can transmit and receive in cooperation. Assumption 2: The first cell is composed of multiple TRPs (or sub-cells) with different cell IDs. The multiple TRPs / sub-cells can transmit and receive in cooperation.

[0064] 5A is a diagram showing an example of the outline of the cell-free configuration assumption 1. In the example shown in FIG. 5A, each TRP included in the first cell (super cell / cell) has the same PCI (PCI #0). Multiple TRPs can communicate with one UE in a coordinated manner.

[0065] Figure 5B is a diagram showing an example of the outline of the cell-free configuration assumption 2. In the example shown in Figure 5B, each TRP included in the first cell (super cell / cell) has a different PCI (PCI #0 to #9). Multiple TRPs can communicate with one UE in a coordinated manner.

[0066] Figure 5C is a diagram showing another example of the outline of the cell-free configuration assumption 2. In the example shown in Figure 5C, a PCI is assigned to each TRP included in the first cell (supercell / cell). In the example shown in Figure 5C, unlike the example in Figure 5B, the same PCI may correspond to multiple TRPs. Multiple TRPs can communicate cooperatively with one UE.

[0067] Transmission / reception with TRP / subcell coordination may be based on at least one of the following schemes supported in NR: - Transmission of a single TRP / subcell with dynamic TRP / subcell switching (single-TRP transmission). - Joint transmission using multiple TRPs / subcells (multi-TRP joint transmission). The joint transmission may be based on a single DCI or multiple DCIs. The joint transmission may be non-coherent joint transmission (NCJT) or coherent joint transmission (CJT).

[0068] For cell-free, assuming ideal backhaul and tight coordination, in the joint transmission scheme, CJT may be prioritized over NCJT, and single DCI-based joint transmission may be prioritized over multi-DCI-based joint transmission.

[0069] <Cell Configuration> The configurations of the first cell and the second cell will be described.

[0070] The UE may transmit and receive signals using a second cell included in the first cell, and may receive a configuration for the second cell and transmit and receive signals based on the configuration.

[0071] Components of one Physical Cell ID (PCI) may include at least one of the following: Number of TRPs per PCI, TRP coverage layout, Number of synchronization signals (e.g., SSB, SS / PBCH blocks) per TRP.

[0072] The configuration of the first cell may be associated with a component of the PCI. The first cell may be configured based on the component of the PCI.

[0073] 6 is a diagram showing an example of a pattern of a PCI component. As shown in FIG. 6, the PCI component is composed of the number of TRPs per PCI, the TRP coverage layout, and the number of SSBs per TRP.

[0074] As shown in FIG. 6, the number of TRPs per PCI may take one or multiple values, the TRP coverage layout may be either non-overlapping or overlapping in TRP coverage, and the number of SSBs per TRP may take one or multiple values.

[0075] In the present disclosure, the pattern related to the PCI component may be any one of patterns 1 to 5 shown in Fig. 6. The pattern numbers shown in Fig. 6 are all examples and are not limited to these examples. Furthermore, the PCI component may include elements other than those shown in Fig. 6.

[0076] 7A is a diagram showing an example of a cell configuration according to pattern 1. In the cell configuration shown in FIG. 7A, the number of TRPs included in PCI / cell is one, the TRP coverage does not overlap, and the number of SSBs per TRP is multiple. In the cell configuration shown in FIG. 7A, the coverage of the TRP may coincide with the coverage of the cell (first cell) (therefore, the coverage of the TRP is not shown in FIG. 7A).

[0077] For example, inter-cell multi-TRP operation can be performed using a cell configuration according to pattern 1 as shown in FIG. 7A.

[0078] 7B is a diagram showing an example of a cell configuration according to Pattern 2. In the cell configuration shown in FIG. 7B, the number of TRPs included in the PCI / cell is multiple, the TRP coverage does not overlap, and the number of SSBs per TRP is one. In the cell configuration shown in FIG. 7B, the coverage of the TRP may coincide with the coverage of the SSB (therefore, the coverage of the TRP is not shown in FIG. 7B).

[0079] For example, inter-cell multi-TRP operation can be performed using a cell configuration according to pattern 2 as shown in FIG. 7B.

[0080] 7C is a diagram showing an example of a cell configuration according to Pattern 3. In the cell configuration shown in FIG. 7C, the number of TRPs included in the PCI / cell is multiple, the TRP coverage does not overlap, and the number of SSBs per TRP is multiple.

[0081] For example, inter-cell multi-TRP operation can be performed using a cell configuration according to pattern 3 as shown in FIG. 7C.

[0082] 7D is a diagram showing an example of a cell configuration according to Pattern 4. In the cell configuration shown in FIG. 7D, the number of TRPs included in the PCI / cell is multiple, the TRP coverage overlaps, and the number of SSBs per TRP is one. Note that in the cell configuration shown in FIG. 7D, the coverage of the TRP may coincide with the coverage of the SSB (therefore, the coverage of the TRP is not shown in FIG. 7D).

[0083] For example, inter-cell / intra-cell multi-TRP operation can be performed using a cell configuration according to Pattern 4 as shown in FIG. 7D.

[0084] 7E is a diagram showing an example of a cell configuration according to Pattern 5. In the cell configuration shown in FIG. 7E, the number of TRPs included in the PCI / cell is multiple, the TRP coverage overlaps, and the number of SSBs per TRP is multiple.

[0085] For example, inter-cell / intra-cell multi-TRP operation can be performed using a cell configuration according to pattern 5 as shown in FIG. 7E.

[0086] <Area Configuration> The components of one second cell (e.g., area) may include at least one of the following: - Number of CU / DUs per second cell - Number of PCIs per second cell - Number of TRPs per second cell - Number of synchronization signals (e.g., SSB, SS / PBCH blocks) per second cell.

[0087] The configuration of the second cell may be associated with the components of the second cell, and the second cell may be configured based on the components of the second cell.

[0088] 8 is a diagram showing an example of a pattern of the elements (area components) of one area. As shown in FIG. 8, the area components are composed of the number of CU / DUs per area, the number of PCIs per area, the number of TRPs per area, and the number of synchronization signals per area.

[0089] As shown in Figure 8, the number of CU / DUs per second cell, the number of PCIs per second cell, the number of TRPs per second cell, and the number of synchronization signals per second cell can each take one or more values.

[0090] In the present disclosure, a pattern related to an area component may be any of patterns A to E shown in Fig. 8. The pattern symbols shown in Fig. 8 are all examples and are not limited to these examples. Furthermore, an area component may include elements other than the elements shown in Fig. 8.

[0091] For example, the second cells according to the above patterns A, D, and E may be configurable in any first cell (cell configuration).

[0092] The following describes configurations related to the first cell / second cell when different cells overlap and when they do not overlap, and at least one of the following configurations related to the first cell / second cell may be defined / set.

[0093] <<Configuration of First Cell / Second Cell According to Pattern 1>> [Option 1-1] Different first cells do not have to (physically) overlap.

[0094] In this option, the second cell may be configured according to at least one of the patterns A, B, D and E above.

[0095] 9A is a diagram showing an example of the configuration of the first and second cells according to Option 1-1. In the example shown in FIG. 9A, two different cells (first cells) do not overlap.

[0096] In the example shown in FIG. 9A, a second cell (coverage of the second cell) related to pattern A, a second cell (coverage of the second cell) related to pattern B, and a second cell (coverage of the second cell) related to pattern D / E are shown.

[0097] In the cell configuration in Figure 9A, the coverage of the TRP may match the coverage of the cell (first cell) (therefore, the coverage of the TRP is not shown in Figure 9A).

[0098] In this optional configuration, only single-TRP operation may be possible in each secondary cell.

[0099] This optional configuration allows for better network energy saving (NES).

[0100] [Option 1-2] Different first cells may (physically) overlap.

[0101] In this option, the second cell may be configured according to at least one of the patterns A, B, D and E above.

[0102] 9B is a diagram showing an example of the configuration of the first and second cells according to Option 1-2. In the example shown in FIG. 9B, two different cells (first cells) overlap.

[0103] In the example shown in FIG. 9B, a second cell (coverage of the second cell) related to pattern A, a second cell (coverage of the second cell) related to pattern B, and a second cell (coverage of the second cell) related to pattern D / E are shown.

[0104] In the cell configuration in Figure 9B, the coverage of the TRP may match the coverage of the cell (first cell) (therefore, the coverage of the TRP is not shown in Figure 9B).

[0105] In this optional configuration, for example, inter-cell multi-TRP operation may be enabled in the second cell according to pattern D / E.

[0106] This optional configuration can, for example, increase the coverage within overlapping cells, thereby improving the uniformity of communication quality.

[0107] Furthermore, this optional configuration can increase frequency utilization efficiency by, for example, reducing coverage in overlapping cells.

[0108] In addition, in the configuration of this option, by reusing existing NR-specification antennas / TRPs, operation can be achieved by modifying the antenna / TRP devices so that they overlap with the coverage deployed by existing NR, thereby reducing station installation costs.

[0109] <<Configuration of First Cell / Second Cell According to Pattern 2 / Pattern 4>> [Option 2 / 4-1] Different first cells do not have to overlap (physically).

[0110] In this option, the second cell may be configured according to at least one of the patterns A, C, D and E above.

[0111] 10A is a diagram showing an example of the configuration of the first and second cells according to Option 2 / 4-1. In the example shown in FIG. 10A, two different cells (first cells) do not overlap.

[0112] In the example shown in FIG. 10A, a second cell (coverage of the second cell) related to pattern A, a second cell (coverage of the second cell) related to pattern C, and a second cell (coverage of the second cell) related to pattern D / E are shown.

[0113] In the cell configuration in FIG. 10A, the coverage of the TRP may coincide with the coverage of the SSB (therefore, the coverage of the TRP is not shown in FIG. 10A).

[0114] Also, in this optional configuration, only single TRP operation may be possible in each second cell.

[0115] According to this optional configuration, for example, by increasing the number of TRPs per first cell, it is possible to improve the uniformity of communication quality and frequency utilization efficiency.

[0116] [Option 2 / 4-2] Different first cells may (physically) overlap.

[0117] In this option, the second cell may be configured according to at least one of the patterns A, C, D and E above.

[0118] 10B is a diagram showing an example of the configuration of the first and second cells according to option 2 / 4-2. In the example shown in FIG. 10B, two different cells (first cells) overlap.

[0119] In the example shown in FIG. 10B, a second cell (coverage of the second cell) related to pattern A, a second cell (coverage of the second cell) related to pattern C, and a second cell (coverage of the second cell) related to pattern D / E are shown.

[0120] In the cell configuration in FIG. 10B, the coverage of the TRP may coincide with the coverage of the SSB (therefore, the coverage of the TRP is not shown in FIG. 10B).

[0121] In this optional configuration, for example, inter-cell multi-TRP operation may be enabled in the second cell according to pattern D / E.

[0122] This optional configuration can, for example, increase the coverage within overlapping cells, thereby improving the uniformity of communication quality.

[0123] Furthermore, this optional configuration can increase frequency utilization efficiency by, for example, reducing coverage in overlapping cells.

[0124] Furthermore, according to the configuration of this option, for example, by increasing the number of TRPs per first cell, it is possible to improve the uniformity of communication quality and frequency utilization efficiency.

[0125] <<Configuration of First Cell / Second Cell According to Pattern 3 / Pattern 5>> [Option 3 / 5-1] Different first cells do not have to overlap (physically).

[0126] In this option, the second cell may be configured according to at least one of the patterns A, B, C, D and E above.

[0127] 11A is a diagram showing an example of the configuration of the first and second cells according to Option 3 / 5-1. In the example shown in FIG. 11A, two different cells (first cells) do not overlap.

[0128] In the example shown in FIG. 11A, a second cell (second cell coverage) related to pattern A, a second cell (second cell coverage) related to pattern B, a second cell (second cell coverage) related to pattern C, and a second cell (second cell coverage) related to pattern D / E are shown.

[0129] 11A shows an example in which the second cell according to pattern B is included only in the coverage of antenna / TRP#0, and the second cell according to pattern C shown in FIG. 11A shows an example in which the second cell corresponds to the overlapping portion between the coverage of antenna / TRP#1 and the coverage of antenna / TRP#2.

[0130] In this optional configuration, single TRP operation may be possible in each second cell.

[0131] In addition, in this optional configuration, in the second cell where the coverage of multiple TRPs overlap, intra-cell multi-TRP operation may be enabled, which can improve frequency utilization efficiency.

[0132] Furthermore, according to the configuration of this option, for example, by increasing the number of TRPs per first cell, it is possible to improve the uniformity of communication quality and frequency utilization efficiency.

[0133] [Option 3 / 5-2] Different first cells may overlap (physically).

[0134] In this option, the second cell may be configured according to at least one of the patterns A, B, C, D and E above.

[0135] 11B is a diagram showing an example of the configuration of the first and second cells according to option 3 / 5-2. In the example shown in FIG. 11B, two different cells (first cells) overlap.

[0136] In the example shown in FIG. 11B, a second cell (second cell coverage) related to pattern A, a second cell (second cell coverage) related to pattern B, a second cell (second cell coverage) related to pattern C, and a second cell (second cell coverage) related to pattern D / E are shown.

[0137] 11B shows an example in which the second cell according to pattern B is included only in the coverage of antenna / TRP#0, and the second cell according to pattern C according to pattern B is included in the overlapping area between the coverage of antenna / TRP#1 and the coverage of antenna / TRP#2.

[0138] In this optional configuration, for example, inter-cell multi-TRP operation may be enabled in the second cell according to pattern D / E.

[0139] In addition, in this optional configuration, in the case of the cell configuration of Pattern 5, intra-cell multi-TRP operation may be possible. By configuring in this way, it is possible to improve frequency utilization efficiency.

[0140] According to the configuration of this option, for example, it is possible to improve the uniformity of communication quality and frequency utilization efficiency compared to the above-mentioned option 1-2, and it is possible to reduce station placement costs compared to the above-mentioned option 2 / 4-2.

[0141] <Sharing Between Areas (Second Cells)> [Option 1] A synchronization signal (e.g., SSB and / or SS / PBCH block) may be shared between multiple second cells. A UE may assume that it can receive the same (shared / common) synchronization signal in different second cells.

[0142] In this case, the information contained in the synchronization signal may be configurable as second cell-specific information.

[0143] In Opt1, the TRP / PCI may be shared among multiple second cells.

[0144] In Opt1, at least one of the following may be used among multiple second cells: an ID for the same synchronization signal (e.g., SSB ID / SSB index / candidate SSB index), an ID for the same TRP (e.g., at least one of an ID for identifying a TRP, a TRP ID, and a CORESET pool index), and the same PCI.

[0145] FIG. 12A is a diagram showing an example of an area related to Opt1. FIG. 12A shows one cell including TRP#0-TRP#3. In the example shown in FIG. 12A, Area#1 and Area#2 are formed within the coverage of TRP#0. Area#1 and Area#2 overlap with each other, and have the same SSB coverage. In other words, in the overlapping area, Area#1 and Area#2 can share the same SSB / TRP / PCI.

[0146] By enabling a configuration like Opt1, the most flexible configuration of the second cell is possible.

[0147] [Option 2] Synchronization signals may not be shared among multiple second cells. The UE may assume that it does not receive the same (shared / common) synchronization signal in different multiple second cells.

[0148] In this case, the information included in the synchronization signal may be configurable as information specific to the second cell, and in this case, the second cell may be identified using an index related to the synchronization signal.

[0149] In Opt2, the TRP / PCI may be shared among multiple second cells.

[0150] In Opt2, at least one of an ID for the same TRP (e.g., at least one of an ID for identifying the TRP, a TRP ID, and a CORESET pool index) and the same PCI may be used among multiple second cells.

[0151] FIG. 12B is a diagram showing an example of an area related to Opt2. FIG. 12B shows one cell including TRP#0-TRP#3. In the example shown in FIG. 12B, Area#1 and Area#2 are formed within the coverage of TRP#1. Area#1 and Area#2 do not overlap with each other, so Area#1 and Area#2 have different SSB coverage. Therefore, areas included in Area#1 or Area#2 do not share the same SSB, but can share the same TRP / PCI.

[0152] In a configuration such as Opt2, the maximum number of second cells within a first cell may be the number of synchronization signals (SSB / SSB coverage), or, if the second cell spans multiple SSB coverages, the maximum number of second cells within a first cell may be the number of SSBs (SSB groups) spanned.

[0153] [Option 3] Synchronization signals and TRPs may not be shared among multiple second cells. The UE may assume that it does not transmit and receive signals for the same TRP and does not receive the same (shared / common) synchronization signal in different multiple second cells.

[0154] In this case, the information included in the synchronization signal may be set as information specific to the second cell. Also, in this case, the second cell may be identified using an index related to the synchronization signal. Also, in this case, the second cell may be identified using an ID related to the TRP (an ID for identifying the TRP).

[0155] In Opt3, the PCI may be shared among multiple second cells.

[0156] In Opt3, the same PCI may be used among multiple second cells.

[0157] FIG. 12C is a diagram showing an example of an area related to Opt3. FIG. 12C shows one cell including TRP#0-TRP#3. In the example shown in FIG. 12C, Area#1 is formed within the coverage of TRP#2, and Area#2 is formed within the coverage of TRP#3. Area#1 and Area#2 do not overlap with each other, so Area#1 and Area#2 have different SSB coverage. Therefore, the areas included in Area#1 or Area#2 do not share the same SSB, do not share the same TRP, and can share the same PCI.

[0158] In a configuration such as option 0-3-3, the maximum number of second cells in a first cell may be the number of TRPs. Also, if the second cell spans multiple TRPs, the maximum number of second cells in a first cell may be the number of spanning TRPs (TRP groups).

[0159] [Option 4] Synchronization signals, TRPs, and PCIs may not be shared among multiple second cells. The UE may assume that different second cells do not transmit / receive signals to / from the same cell (first cell / PCI), the same TRP, or receive the same (shared / common) synchronization signal.

[0160] In this case, the information included in the synchronization signal may be set as information specific to the second cell. Also, in this case, the second cell may be identified using an index related to the synchronization signal. Also, in this case, the second cell may be identified using an ID related to the TRP (an ID for identifying the TRP). Also, in this case, the second cell may be identified using a PCI.

[0161] In a configuration such as Opt4, the maximum number of second cells in a first cell may be 1. Also, when a second cell spans multiple first cells, the total maximum number of second cells may be the number of spanned first cells / PCIs (PCI groups).

[0162] Each of the above options may be selected / determined based on the above-mentioned conditions / triggers (for example, conditions / triggers based on time / number of UEs / traffic, etc.).

[0163] The change / update of each of the above options may be configured / instructed / notified to the UE based on at least one of system information (e.g., SIB / MIB), higher layer signaling (RRC parameters / MAC CE), and DCI.

[0164] The above options may be changed / updated based on the above conditions / triggers (e.g., timers / events) or based on the implementation of the NW / UE.

[0165] The ID in each of the above options (e.g., an ID related to a synchronization signal, an ID related to a TRP, and / or a PCI) may be a global ID (e.g., common to all networks) or a local ID (e.g., unique to a part of networks).

[0166] The number (e.g., the maximum number) of multiple second cells using at least one of the same synchronization signal ID, the same TRP ID, and the same PCI may be predefined in a specification, may be configured / instructed / notified to a UE using higher layer signaling (RRC / MAC CE) / DCI, may be determined based on a report of UE capability information, or may be determined by a combination of at least two of these.

[0167] <Flexibility of Area (Second Cell)> The area (second cell) may be configured / reconfigured based on a specific condition / occasion.

[0168] The configuration of the second cell may be changed / updated based on certain conditions / trigger(s).

[0169] The specific condition / trigger may be, for example, at least one of a condition / trigger related to UE distribution, a condition / trigger related to traffic, a condition / trigger related to a specific event, and a condition / trigger based on specific information (for example, at least one of information related to time, location information related to UE / TRP, and information related to the season).

[0170] For example, the condition / trigger related to the distribution of UEs may be a condition / trigger based on the distribution / number of UEs in the first cell / second cell.

[0171] For example, the traffic-related conditions / triggers may be conditions / triggers based on at least one of the traffic volume / communication volume within the first cell / second cell, the traffic volume / communication volume for TRP, and the traffic volume / communication volume for SSB.

[0172] For example, a specific event related to a condition / trigger for a specific event may be predefined in a specification or may depend on the implementation of the network.

[0173] For example, the condition / trigger based on specific information may be a condition / trigger based on at least one of information regarding the time of day, information regarding a specific timer, location information regarding the UE / TRP, and information regarding the time of year (e.g., date, time, day of the week, weather, etc.).

[0174] The second cell may be configured based on the particular condition / trigger, or statically, regardless of the particular condition.

[0175] The second cell may be dynamically / semi-statically configured based on the specific condition / trigger. By configuring in this manner, it is possible to reduce power consumption in the network and provide communication quality that meets the demands of the UE.

[0176] Restrictions on the change / update of the second cell may be defined. The NW may decide not to change / update the second cell in certain cases.

[0177] Fig. 13 is a diagram illustrating an example of a change in the configuration of the second cell. The example illustrated in Fig. 13 illustrates a case in which the range of the second cell (area) is changed according to the distribution of UEs and the change in time (from time #1 to time #2).

[0178] The area may have a static, dynamic, or semi-static configuration. Flexible area configuration makes it possible to reduce the power consumption of the network while providing quality that meets demand.

[0179] (Analysis) Incidentally, in the above-mentioned existing cellular system, switching of RRC reconfiguration can be performed in units of PCI (Physical Cell ID).

[0180] For example, in an L3 handover, the PCI is switched based on the RRC reconfiguration transmitted from the base station (Example 1). Also, in the LTM of Rel. 18, the candidate cell is configured by the RRC reconfiguration. In this case, when a cell switch is instructed by a MAC CE (e.g., a cell switch command), the UE switches the RRC reconfiguration.

[0181] On the other hand, whether or not different RRC [re]configurations are applied (or are required) for each PCI depends on the situation. That is, there may be cases where different configurations are required for each PCI and cases where they are not required.

[0182] In the former case (where different settings are required for each PCI), it is necessary to support different settings for each PCI, which makes it possible to flexibly switch settings for each PCI.

[0183] In the latter case, it is conceivable to standardize the RRC settings among different PCIs in order to use (share) the same settings among multiple PCIs, thereby making it possible to reduce communication overhead.

[0184] It is necessary to clarify the RRC configuration method to achieve both of these. If this is not clear, there is a risk that communication throughput (reduction of communication overhead) will be affected.

[0185] The above-mentioned issues are not limited to existing mobility systems, but are also likely to arise in future self-driving systems.

[0186] Therefore, the present inventors came up with a method for solving the above problem, regardless of the type of mobility.

[0187] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0188] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0189] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0190] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0191] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0192] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0193] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0194] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0195] In the present disclosure, the terms drop, abort, cancel, puncture, rate match, postpone, do not transmit, etc. may be read interchangeably.

[0196] In the present disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In the present disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0197] In the present disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0198] In the present disclosure, base station, gNB, and network (NW) may be read interchangeably.

[0199] In the present disclosure, a cell group, a serving cell group, a master cell group (MCG), and a secondary cell group (SCG) may be interchangeable. L1 / L2, L1 / L2 signaling, and DCI / MAC CE may be interchangeable. A serving cell may be replaced with a cell that transmits a PDSCH. A candidate cell may refer to a cell that is a candidate to become a serving cell through L1 / L2 inter-cell mobility. L1L2-triggered mobility (LTM) and L1 / L2 inter-cell mobility may be interchangeable.

[0200] In the present disclosure, the terms cell, PCI, serving cell, source serving cell, source cell, CC, BWP, BWP within a CC, and band may be interchangeable. In the present disclosure, the terms cell, PCI, cell with an additional PCI, additional cell, other cell, non-serving cell, cell with a different PCI, candidate cell, candidate serving cell, cell with a PCI different from the PCI of the current serving cell, another serving cell, and target cell may be interchangeable. The target cell may be a cell selected from multiple candidate cells. In the present disclosure, the terms switch, change, and update may be interchangeable. The serving cell may be interchangeable with the serving cell before the switch or the serving cell after the switch.

[0201] Each embodiment of the present disclosure is also applicable to a cell-free configuration. A cell with a fixed physical range, an unchanging cell, a first cell, a DU, a super cell, a cell, a macro cell, a large cell, a main cell, and the like may be read as interchangeable terms.

[0202] In the present disclosure, a cell whose physical range changes quasi-statically / dynamically based on conditions, a cell that changes, a second cell, a cell, an area, a microcell, a small cell, a second cell within a first cell, etc. may be read interchangeably.

[0203] "DU" in each embodiment of the present disclosure may mean (or be read as) a first cell, and in this case, "cell" in each embodiment of the present disclosure may mean (or be read as) a second cell.

[0204] Furthermore, the term "cell" in each embodiment of the present disclosure may refer to (or be interpreted as) the first cell.

[0205] Of the network (NW) configurations in the present disclosure, the DU / CU / RU can be appropriately changed to a NW configuration in the ORAN (for example, O-DU / O-CU / O-RU).

[0206] In the present disclosure, handover, handover defined in Rel. 15, CHO, DAPS handover, LTM, and cell switching may be read interchangeably.

[0207] In this disclosure, the terms "set" and "configure" may be read interchangeably. Also, the terms "reconfigure" and "reconfigure" may be read interchangeably.

[0208] In the present disclosure, higher layer parameters, RRC parameters, RRC information elements (IEs), RRC settings, RRC configurations, and simply settings / configurations may be read interchangeably.

[0209] (Wireless Communication Method) In the present disclosure, a cell with a fixed physical range, a cell that does not change, a first cell, a super cell, a cell, a macro cell, a large cell, and the like may be read as interchangeable terms.

[0210] In the present disclosure, a cell whose physical range changes quasi-statically / dynamically based on conditions, a cell that changes, a second cell, a cell, an area, a microcell, a small cell, a second cell within a first cell, etc. may be read interchangeably.

[0211] The first cell may include one or more second cells.

[0212] One second cell may be included in multiple first cells, and different first cells may share one second cell.

[0213] The different first cells may or may not overlap.

[0214] The present disclosure is not limited to cell-free systems, but can be applied to various mobility use cases / scenarios (L1 / L2 inter-cell mobility, CHO, LTM after Rel. 18, etc.).

[0215] In the present disclosure, TRP group, TRP cluster, and TRP clustering may be read interchangeably.

[0216] The UE may receive (be configured / provided with) the configuration of the present disclosure from a specific base station. Furthermore, the UE may perform connection (access) control, connection destination cell switching control, etc. based on the configuration. The base station may transmit / configure / provide various settings to the UE to realize the UE's control.

[0217] In this disclosure, cell-free may mean forming one or more cells / areas / coverages using multiple antennas / TRPs, forming a cell / area / coverage that is independent of the location of the antennas / TRPs, or including dynamic cells (in addition to fixed cells). Cell-free communication may also mean communication that utilizes the cell / area / coverage.

[0218] In the present disclosure, [RRC] settings (RRC parameters), specific settings may be interchangeably read as [re]settings for connection (access) / switching [to (a specific cell)], etc.

[0219] In the present disclosure, the terms "every" and "units" may be read interchangeably.

[0220] First Embodiment The first embodiment relates to the unit / granularity of RRC [re]configuration.

[0221] <<Configuration Unit / Granularity>> The UE may be configured / provided with (receive) specific configurations (RRC parameters) in at least one unit (which may be called granularity / specific granularity, etc.) of the following Opt1-1 to Opt1-10.

[0222] (Opt1-1) Cell group. That is, the UE may be configured / provided (receive) a specific configuration for each cell group. In other words, the specific configuration may include multiple configurations for multiple cell groups (configurations for each cell group).

[0223] (Opt1-2) PCI (Physical Cell ID). That is, the UE may be configured / provided (receive) a specific configuration for each PCI. In other words, the specific configuration may include multiple configurations for multiple PCIs (per-PCI configurations).

[0224] (Opt1-3) TRP Group. That is, the UE may be configured / provided (receive) a specific configuration for each TRP group. In other words, the specific configuration may include multiple configurations for multiple TRP groups (configurations per TRP group).

[0225] (Opt1-4) TRP. That is, the UE may be configured / provided (receive) a specific configuration for each TRP. In other words, the specific configuration may include multiple configurations for multiple TRPs (per-TRP configurations).

[0226] (Opt1-5) BWP / CC. That is, the UE may be configured / provided (receive) a specific configuration for each BWP / CC. In other words, the specific configuration may include multiple configurations for multiple BWPs / CCs (configurations for each BWP / CC).

[0227] (Opt1-6) Signal / Channel. That is, the UE may be configured / provided (receive) a specific configuration for each signal / channel. In other words, a specific configuration may include multiple configurations for multiple signals / channels (configurations for each signal / channel).

[0228] The signal / channel may be constituted by a specific physical channel (e.g., at least one of a DL channel (PDSCH / PDCCH) and a UL channel (PUSCH / PUCCH / PRACH)).

[0229] (Opt1-7) TCI Status List. That is, the UE may be configured / provided (receive) a specific configuration for each TCI status list. In other words, the specific configuration may include multiple configurations for multiple TCI status lists (configurations for each TCI status list).

[0230] (Opt1-8) TCI state. That is, the UE may be configured / provided (receive) a specific configuration for each TCI state. In other words, the specific configuration may include multiple configurations for multiple TCI states (per-TCI-state configurations).

[0231] (Opt1-9) [RS] Resource Set. That is, the UE may be configured / provided (receive) a specific configuration for each resource set. In other words, a specific configuration may include multiple configurations for multiple resource sets (configurations per resource set).

[0232] (Opt1-10) [RS] Resources. That is, the UE may be configured / provided (receive) a specific configuration for each resource. In other words, the specific configuration may include multiple configurations for multiple resources (per-resource configurations).

[0233] The above-mentioned Opt1-1 to Opt1-10 may mean that the granularity of the RRC configuration unit becomes finer as the index of the option increases. For example, a parameter related to the granularity (index (e.g., #1 to #10), which may be called a granularity ID) may be defined / set.

[0234] Specifically, when the granularity ID is #1, it may mean that a specific setting is configured on a cell group basis (corresponding to Opt1-1 described above). Also, when the granularity ID is #10, it may mean that a specific setting is configured on a resource basis (corresponding to Opt1-10 described above). In this case, it may mean that the setting granularity becomes finer as the granularity ID increases in ascending order.

[0235] In this way, by specifying / setting the setting units for specific settings in detail, it is possible to flexibly control the settings according to specific use cases / scenarios.

[0236] The granularity of Opt1-1 to Opt1-10 described above is merely an example, and other granularities may be separately defined. Whether any of Opt1-1 to Opt1-10 described above is applied can be varied depending on the use case (operator / area), and may be predefined by specifications, may be separately set / instructed by upper layer signaling / physical layer signaling, or may be determined according to the capabilities of the UE.

[0237] <<Setting Method>> In each of the options described above, the same / different parameters may be set among multiple settings.

[0238] Fig. 14 is a diagram illustrating an example of an RRC configuration according to the first embodiment. Fig. 15A and Fig. 15B are diagrams illustrating an example of an RRC configuration according to the first embodiment.

[0239] When different parameters are configured among multiple configurations, different parameters may be configured / provided to the UE for each of the multiple configurations.

[0240] When the same parameter is set among multiple settings, at least one of the following settings Opt2-1 to Opt2-2 may be applied. In this case, the UE may expect the setting of each option.

[0241] (Opt2-1) Among multiple settings, a common part is set as one information element (parameter), and different parts are set as multiple information elements (parameters) (see, for example, FIG. 14 ). Here, the common part [information element (parameter)] may be called a reference setting, a reference parameter, or the like. Furthermore, the different part [information element (parameter)] may be called a difference setting, a difference parameter, or the like.

[0242] 14 shows an example of a specific setting including settings for each TRP group (TRP groups #1 to #3). As shown in FIG. 14, the specific setting includes one reference setting and multiple differential settings (differential settings #1 to #3).

[0243] More specifically, the specific settings include multiple (three in FIG. 14) settings on a TRP group basis (settings for TRP groups #1 to #3).

[0244] The setting of TRP group #1 includes a reference setting and a differential setting #1. Similarly, the setting of TRP group #2 / #3 includes a reference setting and a differential setting #2 / #3.

[0245] In this way, in the individual settings for each TRP group, parameters common to the TRP groups may be set as reference settings, and parameters that differ between the TRP groups may be set as differential settings.

[0246] This enables the UE to properly recognize / determine the common parts (reference settings) and different parts (differential settings) for specific settings that may be configured in specific setting units (e.g., TRP group units).

[0247] 14 shows an example of setting in units of TRP groups (Opt1-3 described above), but is not limited to this. For example, it may be set in units of any of Opt1-1 to Opt1-10 described above (excluding Opt1-3).

[0248] In this way, according to Opt2-1, by making some parameters common (shared) between setting units, it is possible to reduce communication (signaling) overhead during RRC setting.

[0249] In addition, in Figure 14, if the setting of TRP group #1 includes a reference setting, the settings of other TRP groups #2 / #3 may not include (are not set with) the reference setting, and may include only differential settings #2 / #3. In this case, the settings of TRP groups #2 / #3 may be configured to refer to the reference setting of TRP group #1 for the common part. For TRP groups #2 / #3, only the different parts are set, so it is possible to reduce communication overhead during RRC setting.

[0250] (Opt2-2) A specific setting may include multiple settings, but only the same part / shared part (common part) / referenced part (reference part) between setting units is set, and the rest is not set.

[0251] 15A shows an example in which a specific setting is set for each cell / PCI. For example, specific settings #1 to #3 can be set for cells / PCI #1 to #3, respectively.

[0252] Here, each of the specific settings #1 to #3 includes multiple settings (RRC IDs #1 to #4). The multiple settings (RRC IDs #1 to #4) may be configured with the same parameters across the specific settings #1 to #3 (multiple cells / PCIs #1 to #3).

[0253] In the example shown in Figure 15A, the same parameters (specific settings #1 to #3) are set in duplicate between different cells / PCIs. In this case, the UE only needs to follow the set parameters, so the operation / processing of [determination, etc.] is simplified.

[0254] On the other hand, Figure 15B is a diagram showing a setting example of Opt2-2. In Figure 15B, when a specific setting is set for each cell / PCI, if the same parameters are included between cells / PCI #1 to #3, for example, a specific setting is set only for cell / PCI #1. In other words, nothing needs to be set for cell / PCI #2 / #3 (absent).

[0255] Here, the specific configuration may be referred to as a reference configuration, a reference parameter, etc. The reference configuration (specific configuration) includes a plurality of configurations (RRC IDs #1 to #4).

[0256] When applying, for example, one parameter of a specific configuration (e.g., RRC ID #4) in cell / PCI #2 / #3, the specific configuration (reference configuration) configured in cell / PCI #1 may be referenced, i.e., the UE applies (references) to cell / PCI #2 / #3 the reference configuration (parameters) configured in cell / PCI #1.

[0257] In this way, according to Opt2-2, compared to the case where a specific setting is uniformly [overlapped] set for each cell / PCI (FIG. 15A), in FIG. 15B, a specific setting is set for only a part (one) of cells / PCIs, which makes it possible to reduce communication overhead during RRC configuration.

[0258] 15 shows an example of setting in cell / PCI units (Opt1-2 described above), but is not limited to this. For example, setting may be performed in units of any of Opt1-1 to Opt1-10 described above (excluding Opt1-2).

[0259] The above-mentioned reference configurations may be explicitly set / indicated by higher layer signaling (RRC) or may be predefined by a specification.

[0260] For example, the cell (reference cell, i.e., cell / PCI#1 in FIG. 15B) referenced by a cell / PCI (cell / PCI#2 / #3 in FIG. 15B) for which no specific setting is configured may be explicitly configured / instructed.

[0261] In addition, the specification may predefine that the reference setting is associated with a cell group / PCI / TRP group / TRP / BWP / CC / TCI state list / TCI state / RS resource set / RS resource of a specific ID (i.e., a specific ID corresponding to Opt1-1 to Opt1-10 mentioned above).

[0262] Alternatively, if a specific setting is set for only one cell / PCI (cell / PCI#1 in FIG. 15B), the specification may predefine that for cells / PCIs (cells / PCI#2 / #3 in FIG. 15B) for which a specific setting is not set, the specific setting of the reference cell (cell / PCI#1) is to be referenced.

[0263] In this way, according to Opt2-2, when the same RRC parameter (specific setting) is configured in the cell / PCI direction, it is sufficient to configure it in only one cell / PCI. Therefore, the number of bits for configuring the specific setting does not depend on the number of cells / PCIs. In other words, even if the number of cells / PCIs increases, the number of bits remains fixed and does not increase. Therefore, it is possible to reduce communication overhead. Furthermore, it is possible to use the reduced number of bits for expanding the settings of additional cells / candidate cells / PCIs.

[0264] According to this embodiment, the UE can apply specific configurations (RRC parameters) according to specific granularity, thereby realizing flexible configurations while reducing communication overhead.

[0265] <Supplementary Information> <<Notification of Information to UE>> In the above-described embodiments, notification of any information to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) may 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.

[0266] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0267] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0268] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0269] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may 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.

[0270] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0271] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0272] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0273] <<Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-described embodiments may be applied (used) when one or more of the following conditions are met: - A higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured. - The specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters. - The specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS. - A specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported. - The application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0274] The particular UE capability may indicate support for particular processes / operations / controls / information for at least one of the above embodiments.

[0275] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0276] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0277] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0278] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a receiving unit that receives a specific configuration for accessing a specific cell in a specific unit; and a control unit that controls access to the specific cell based on the specific configuration. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the specific unit is at least one unit of a cell group, a physical cell identifier (ID), a transmission / reception point (TRP) group, a TRP, a bandwidth portion (BWP), a component carrier (CC), a channel, a transmission configuration indication (TCI) state list, a TCI state, a reference signal (RS) resource set, and an RS resource. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein, when the same parameter is set among multiple configurations set in the specific unit, the control unit expects the specific configuration to include a differential configuration that indicates a parameter different from a reference configuration that indicates the same parameter. [Supplementary Note 4] When the same parameter is set among a plurality of settings set on a cell-by-cell basis and a specific setting is set only in one cell, the control unit applies the setting for the other cells by referring to the specific setting. The terminal according to any one of Supplementary Note 1 to Supplementary Note 3.

[0279] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0280] 16 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0281] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0282] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0283] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0284] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0285] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0286] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0287] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0288] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0289] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0290] The core network 30 may include network functions (Network Functions (NF)) such as 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), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0291] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0292] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0293] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0294] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0295] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0296] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0297] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0298] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0299] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0300] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0301] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0302] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0303] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0304] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0305] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0306] (Base Station) Fig. 17 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0307] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0308] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0309] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0310] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0311] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0312] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0313] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0314] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0315] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0316] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0317] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0318] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0319] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0320] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0321] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0322] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0323] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0324] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0325] The control unit 110 may generate specific settings for the terminal to access a specific cell in specific units, and the transceiver unit 120 may transmit the specific settings.

[0326] (User Terminal) Fig. 18 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0327] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0328] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0329] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0330] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0331] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0332] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0333] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0334] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0335] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0336] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0337] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0338] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0339] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0340] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0341] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0342] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0343] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0344] The control unit 210 may perform at least part of the processing of the control unit in the above supplementary notes.

[0345] The transceiver unit 220 may perform at least part of the processing of the transmitter / receiver unit in the above appendix.

[0346] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0347] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0348] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 19 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0349] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0350] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0351] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0352] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0353] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0354] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0355] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0356] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0357] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0358] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0359] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0360] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0361] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0362] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0363] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0364] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0365] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0366] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0367] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0368] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0369] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0370] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0371] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0372] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0373] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0374] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0375] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0376] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0377] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0378] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0379] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0380] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0381] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0382] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0383] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0384] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0385] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0386] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0387] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0388] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0389] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0390] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0391] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0392] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0393] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0394] The group may include, for example, at least one of a spatial relationship 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., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0395] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0396] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0397] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0398] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0399] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0400] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0401] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0402] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0403] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0404] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0405] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0406] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0407] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0408] 20 is a diagram showing 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, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM 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.

[0409] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0410] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0411] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0412] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0413] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0414] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0415] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0416] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0417] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 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, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0418] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0419] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0420] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0421] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0422] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0423] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0424] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0425] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0426] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0427] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0428] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0429] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0430] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0431] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...." "does not expect ..." may be interchangeably read as "be not expected ...." Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0432] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0433] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0434] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0435] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0436] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0437] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0438] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0439] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0440] In the present disclosure, terms such as "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," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0441] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0442] Although the invention according to the present disclosure has been described in detail above, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure.

Claims

1. A terminal having: a receiving unit that receives specific settings for accessing a specific cell in specific units; and a control unit that controls access to the specific cell based on the specific settings.

2. The terminal of claim 1, wherein the specific unit is at least one unit of a cell group, a physical cell identifier (ID), a transmission / reception point (TRP) group, a TRP, a bandwidth portion (BWP), a component carrier (CC), a channel, a transmission configuration indication (TCI) state list, a TCI state, a reference signal (RS) resource set, and an RS resource.

3. The terminal according to claim 1, wherein when the same parameter is set among multiple settings set in the specific unit, the control unit expects that the specific setting includes a reference setting indicating the same parameter and a differential setting indicating a parameter different from the reference setting.

4. The terminal according to claim 1, wherein when the same parameters are set among multiple settings set on a cell-by-cell basis and a specific setting is set in only one cell, the control unit applies the settings for other cells by referring to the specific setting.

5. A wireless communication method for a terminal, comprising: a step of receiving specific settings for accessing a specific cell in specific units; and a step of controlling access to the specific cell based on the specific settings.

6. A base station having a control unit that generates specific settings for a terminal to access a specific cell in specific units, and a transmission unit that transmits the specific settings.

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