Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure is characterized by comprising: a control unit that selects a beam to be reported, on the basis of uplink (UL) beam quality and downlink (DL) beam quality; and a transmission unit that transmits a beam report including the UL beam quality and / or the DL beam quality for the selected beam. According to the aspect of the present disclosure, reporting (CSI reporting) relating to a beam can be appropriately executed.

Description

[Technical Field]

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

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

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

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

[0005] In a wireless communication system, a UE measures a channel state using a predetermined reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to a base station. The CSI report corresponds to a beam report (beam).

[0006] However, it is not clear how to report beams when the beam reporting (CSI reporting) includes at least one of UL beam reporting and DL beam reporting. If the beam reporting is not performed properly, there is a risk that system performance such as throughput will be degraded.

[0007] Therefore, the present disclosure provides a terminal and a wireless communication method that can appropriately perform beam-related reporting (CSI reporting). 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0008] A terminal according to one aspect of the present disclosure includes: When the beam report includes a downlink (DL) beam report and an uplink (UL) beam report, a receiver for receiving the number of DL beam reports and the number of UL beam reports, and a UL Reference Signal Received Power (RSRP) Reach and DL RSRP A control unit that selects a beam to be reported based on at least one of the following: The DL RSRP according to the number of DL beam reports, and the UL RSRP according to the number of UL beam reports and a transmitting unit that transmits a beam report including the beam report. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, beam-related reporting (CSI reporting) can be performed appropriately. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing the CSI reporting configuration in Rel. 16. [Figure 2]Figure 2 is a diagram showing DL beam reporting of CSI reporting in Rel.16. [Figure 3] FIG. 3 is a diagram illustrating an example of a CSI report including a UL beam report. [Figure 4] FIG. 4 is a diagram showing an example of DL and UL beam quality. [Figure 5] FIG. 5 is a diagram illustrating a first example of a beam report according to the second embodiment. [Figure 6] FIG. 6 is a diagram illustrating a second example of a beam report according to the second embodiment. [Figure 7] FIG. 7 is a diagram showing an example of CSI reporting in option 3-2-1-1. [Figure 8] FIG. 8 is a diagram showing an example of CSI reporting in option 3-2-1-2. [Figure 9] FIG. 9 is a diagram showing an example of CSI reporting in option 3-2-1-3. [Figure 10] FIG. 10 is a diagram showing an example of CSI reporting in option 3-2-1-4. [Figure 11] FIG. 11 is a diagram showing an example of CSI reporting in option 3-2-2-1. [Figure 12] FIG. 12 is a diagram showing an example of CSI reporting in option 3-2-2-2. [Figure 13] FIG. 13 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 16] FIG. 16 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (MPE) The NR is considering how to address the issue of Maximum Permitted Exposure (MPE) (or electromagnetic power density exposure). For health and safety reasons, UE is required to meet Federal Communication Commission (FCC) regulations regarding maximum radiation to the human body. For example, Rel. 15 NR specifies the following two restriction methods for limiting exposure:

[0012] <Restriction method 1> As a first restriction method, a restriction using power-management maximum power reduction (P-MPR) is specified. For example, when the UE maximum output power P CMAX,f,c is the corresponding P UMAX,f,c The (measured maximum output power, measured set maximum UE output power) is set so as to satisfy the following formula (1). P Powerclass -MAX(MAX(MPR f,c ,A-MPR f,c )+ΔMB P,n ,P-MPR f,c )-MAX{T(MAX(MPR f,c ,A-MPR f,c ,)),T(P-MPR f,c )}≦P UMAX,f,c ≦EIRP max (1)

[0013] EIRP max Let P-MPR be the maximum value of the corresponding measured peak equivalent isotopically radiated power (EIRP). f,c Let P-MPR be a value that indicates the maximum output power reduction allowed for carrier f of serving cell c. f,c is the configured UE maximum output power P CMAX,f,cThis allows the UE to report the maximum available output transmit power to the base station (e.g., gNB), which can then use this report for scheduling decisions. f,c may be used to ensure compliance with available electromagnetic energy absorption requirements in cases of simultaneous transmission on multiple RATs for scenarios not within the scope of 3GPP RAN use, to address unwanted emissions / self-protection requirements, and in cases where proximity detection is used to address requirements requiring a lower maximum output power.

[0014] <Restriction method 2> In 3GPP Rel. 15 NR, in order to satisfy the millimeter wave human body protection guidelines, UE capability information has been introduced to indicate the uplink transmission rate that the UE can transmit at without requiring the application of P-MPR. This capability information may also be called the maximum uplink duty cycle in Frequency Range 2 (FR2) (maxUplinkDutyCycle-FR2).

[0015] maxUplinkDutyCycle-FR2 corresponds to an upper layer parameter. maxUplinkDutyCycle-FR2 may be an upper limit of the UL transmission ratio within a certain evaluation period (e.g., 1 second). In Rel. 15 NR, this value is one of n15, n20, n25, n30, n40, n50, n60, n70, n80, n90, and n100, which correspond to 15%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%, respectively. maxUplinkDutyCycle-FR2 may be applied to all UE power classes of FR2. Note that a default value need not be specified for maxUplinkDutyCycle-FR2.

[0016] As UE capability information, there is a field of maxUplinkDutyCycle-FR2. If the ratio of UL (Uplink) symbols transmitted within an evaluation period of 1 second is greater than maxUplinkDutyCycle-FR2, the UE may apply the restriction using P-MPR (restriction method 1) according to UL scheduling. Otherwise, the UE may not apply P-MPR.

[0017] If there is no field of maxUplinkDutyCycle-FR2 as UE capability information, compliance with electromagnetic power density exposure requirements (MPE requirements) may be ensured by reducing power density or other means.

[0018] <MPE Report> For a UE equipped with multiple panels (multi-panel), in order to quickly select the UL panel, it is being considered to promote UL transmission beam selection based on the UL beam indication, taking into account the UL coverage loss due to MPE. Therefore, it is conceivable that the UE reports on the uplink transmission beam regarding the maximum allowable exposure (MPE) to the MAC CE or the like.

[0019] For example, the UE may report on MPE together with the PH in a single-entry or double-entry Power Headroom Report (PHR) MAC CE. For example, the PHR MAC CE may include a specific field ("P" field). If the mpe-Reporting-FR2 of FR2 is set and the serving cell operates in FR2, and the applied P-MPR value is smaller than a specific P-MPR value (P-MPR_00) for the MPE requirement to be satisfied, 1 is set. If the mpe-Reporting-FR2 of FR2 is not set or the serving cell operates in FR1, the specific field may indicate whether power back-off is applied for power management.

[0020] The PHR MAC CE may include a field ("MPE") indicating MPE (P-MPR). If MPE reporting for FR2 is configured, the serving cell operates in FR2, and the specific field ("P" field) is set to 1, the field indicating MPE may indicate the power back-off to be applied to meet the MPE requirement. The field indicating MPE may indicate an index corresponding to the measured P-MPR value (e.g., in dB). If MPE reporting for FR2 is not configured, or the serving cell operates in FR1, or the specific field is set to 0, the R bit may be present instead of the field indicating MPE.

[0021] The double-entry PHR MAC CE includes a serving cell index and may include the above-mentioned specific field and a field indicating the MPE corresponding to each serving cell.

[0022] (CSI report) In NR, a UE measures a channel state using a predetermined reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to a base station.

[0023] The UE may measure the channel state using a Channel State Information-Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a Demodulation Reference Signal (DMRS), etc.

[0024] The CSI-RS resources may include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (IM). An SS / PBCH block is a block including a synchronization signal (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)) and a PBCH (and corresponding DMRS), and may be referred to as an SS block (SSB). An SSB index may be assigned to the time position of the SSB within a half-frame.

[0025] The CSI may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), a Layer 1 (L1)-Reference Signal Received Power (RSRP), a L1-Reference Signal Received Quality (RSRQ), a L1-Signal to Interference plus Noise Ratio (SINR), a L1-Signal to Noise Ratio (SNR), and the like.

[0026] The CSI may have multiple parts. The first part of the CSI (CSI Part 1) may include information with a relatively small number of bits (e.g., RI). The second part of the CSI (CSI Part 2) may include information with a relatively large number of bits (e.g., CQI), such as information determined based on CSI Part 1.

[0027] As CSI feedback methods, (1) periodic CSI (Periodic CSI: P-CSI) reporting, (2) aperiodic CSI (Aperiodic CSI: A(AP)-CSI) reporting, (3) semi-persistent (semi-persistent, semi-persistent (Semi-Persistent)) CSI reporting (Semi-Persistent CSI: SP-CSI) reporting, etc. have been considered.

[0028] The UE may be notified of information regarding CSI reporting (which may also be referred to as CSI reporting configuration information) using higher layer signaling, physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI)), or a combination thereof. The CSI reporting configuration information may be set using, for example, the RRC information element "CSI-ReportConfig".

[0029] The CSI reporting configuration information may include information regarding, for example, the reporting period, offset, etc., and these may be expressed in a predetermined time unit (slot unit, subframe unit, symbol unit, etc.). The CSI reporting configuration information may include a configuration ID (CSI-ReportConfigId). Parameters such as the type of CSI reporting method (whether it is SP-CSI or not), reporting period, etc. may be specified by the said configuration ID. The CSI reporting configuration information may include information (CSI-ResourceConfigId) indicating which signal (or resources for which signal) the measured CSI is reported using.

[0030] <CSI reporting configuration / CSI reporting (DL beam reporting)> Figure 1 shows the CSI reporting configuration in Rel. 16. "resourcesForChannelMeasurement" is a parameter related to channel measurement. "cri-RSRP" and "ssb-Index-RSRP" are parameters related to beam management. When "cri-RSRP" is set, the UE reports the CRI and the L1-RSRP corresponding to the CRI. When "ssb-Index-RSRP" is set, the UE reports the SSBRI and the L1-RSRP corresponding to the SSBRI.

[0031] "reportQuantity-r16" configures the L1-SINR-based DL beam reporting quantity. "reportQuantity-r16" includes "cri-SINR-r16" and "ssb-Index-SINR-r16". "cri-SINR-r16" and "ssb-Index-SINR-r16" are parameters related to beam management. If "cri-SINR-r16" is configured, the UE reports the CRI and the L1-SINR corresponding to the CRI. If "ssb-Index-SINR-r16" is configured, the UE reports the SSBRI and the L1-SINR corresponding to the SSBRI. If "reportQuantity-r16" is present, "reportQuantity" may be ignored.

[0032] That is, the reporting configuration of L1-RSRP / L1-SINR for the DL beam is included in the CSI reporting configuration.

[0033] Figure 2 is a diagram showing the DL beam report of CSI reports in Rel. 16. "CRI or SSBRI #1", "CRI or SSBRI #2", "CRI or SSBRI #3", and "CRI or SSBRI #4" shown in Figure 2 indicate DL beam indexes. The DL beam indexes are ordered according to the strength of RSRP / SINR, and the RSRP / SINR corresponding to the first (optimal) DL beam index is "RSRP / SINR #1", which may be a value quantized to 7 bits. "Differential RSRP / SINR #2", "Differential RSRP / SINR #3", and "Differential RSRP / SINR #4" are the difference values from "RSRP / SINR #1", which may be values quantized to 4 bits.

[0034] The UE may transmit beam indexes (e.g., RI of SSB / CSI-RS / Sounding Reference Signal (SRS) for measurement, UL panel index, values related to power / MPR (UL RSRP, PHR)) as CSI reports.

[0035] In the CSI report setting, the UL beam report setting and the DL beam report setting may be separated (separate beam measurement / report settings for UL and DL). For example, the UE may receive, by upper layer signaling, a first information element including the UL beam report setting and a second CSI information element different from the first information element and including the DL beam report setting.

[0036] The UE may receive the DL beam report setting together with the UL beam report setting (joint beam measurement / report setting for UL and DL). For example, the UE may receive, by upper layer signaling, one information element including both the UL beam report setting and the DL beam report setting.

[0037] UL beam reporting may be supported in addition to DL beam reporting (e.g., L1-RSRP or L1-SINR), i.e., UL beam reporting may be configured only if DL beam reporting is configured.

[0038] The UL beam report in the CSI report will be described. The CSI report may first include a field for the UL beam index, followed by a field for the value related to the transmit power / MPR of the UL beam. The value related to the transmit power / MPR of the UL beam may be a quantized absolute value, or may be a difference value from the value related to the transmit power / MPR of the optimal UL beam.

[0039] FIG. 3 is a diagram showing an example of a CSI report including an UL beam report. "CRI or SSBRI or SRI #1," "CRI or SSBRI or SRI #2," "CRI or SSBRI or SRI #3," and "CRI or SSBRI or SRI #4" shown in FIG. 3 indicate UL beam indices. "POWER / MPR Related value #1," "POWER / MPR Related value #2," "POWER / MPR Related value #3," and "POWER / MPR Related value #4" are values ​​related to the transmit power / MPR of the UL beam corresponding to each UL beam index. The notation in FIG. 3 is an example, and other notations having similar meanings may be used. The UL beam indices may be ordered according to the strength of RSRP / SINR, and the value related to the transmit power / MPR corresponding to the first (optimal) UL beam index may be reported first (at the beginning). All values ​​related to the transmit power / MPR may be absolute values, or, as with DL beam reports, only the first value may be an absolute value and the subsequent values ​​may be differential values.

[0040] The UE may report a beam index and an estimated remaining power considering the P-MPR for each beam indicated by the beam index. The estimated remaining power for each beam may be a power headroom value (PH value) based on an actual transmission or a reference format (virtual transmission) considering the MPE. Alternatively, the estimated remaining power for each beam may be reported as a PH report (PHR) (e.g., a PH type, PH value, P-MPR value, similar to the content of the PHR MAC CE) considering the MPE (P-MPR value) for each beam. CMAX、f、c ) may be used. The PHR may take into account the TPC / PL-RS for each beam.

[0041] However, when a beam report (CSI report) includes at least one of a UL beam report and a DL beam report, it is not clear how to perform the beam report. For example, the number of beams to be selected (reported), the selection procedure, and the reporting order (mapping order) are not clear. If beam reporting is not performed appropriately, system performance such as throughput may be degraded.

[0042] Therefore, the inventors came up with the idea of ​​a terminal having a control unit that selects a beam to be reported based on at least one of uplink (UL) beam quality and downlink (DL) beam quality, and a transmitting unit that transmits the UL beam quality and DL beam quality of the selected beam as a beam report.

[0043] 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.

[0044] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, resource ID, and RI (resource index or rank index) may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0045] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0046] In the present disclosure, MAC CE and activation / deactivation command may be read interchangeably.

[0047] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), and RRC messages may be interchangeable. Reporting in the present disclosure may be performed by higher layer signaling. In the present disclosure, "reporting," "measurement," and "transmission" may be interchangeable.

[0048] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0049] In this disclosure, the terms beam, panel, spatial domain filter, spatial setting, TCI state, TCI state pool, multiple TCI states, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS for QCL type D in TCI state / QCL assumption, RS for QCL type A in TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be interchangeable. In this disclosure, the terms QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be interchangeable.

[0050] The beam index may be an SSB index, an SSBRI, a CSI-RS, a CRI, an SRS index, or an SRI. The panel index may be an antenna group index / antenna set index, an RS group index / RS set index, or other equivalent index. The beam report transmitted by the UE may support both non-group and group-based reporting.

[0051] In the present disclosure, MPE, MPR, and P-MPR may be interchangeable. CSI report and beam report may be interchangeable. RSRP and SINR may be interchangeable.

[0052] The DL beam report in the present disclosure may include at least one of a DL beam index, an L1-RSRP, and an L1-SINR. The UL beam report may include at least one of a UL beam index, a transmit power of the UL beam, a value related to MPR, and a PH (PHR) taking MPE into account.

[0053] In the present disclosure, selecting a beam may mean selecting a beam (beam index / beam quality) included in a beam report (CSI report). In the present disclosure, mapping (or selecting) report content (beam index, beam quality, etc.) to a beam report based on UL beam quality / DL beam quality may indicate mapping (or selecting) report content to a beam report in order of better UL beam quality / DL beam quality (larger RSRP / SINR / PHR values, smaller MPR values). Note that calculation of UL RSRP will be described later. PHR may be a PHR that takes MPE into consideration. Best, maximum, and strongest may be interchangeable. Beam index, DL beam index, and UL beam index may be interchangeable.

[0054] (Wireless communication method) First Embodiment In the UL beam report (e.g., per-beam UL RSRP, per-beam PHR (UL PHR), or per-beam power value of other UL channels), the UE may select N_U UL beams to report based on the UL beam quality / DL beam quality. The UE transmits a beam report including the quality of the selected UL beam. In the present disclosure, the beam report and the CSI report may be interchangeable.

[0055] Hereinafter, N_U may indicate the number of UL beams selected / reported. The beam selection rule in the present disclosure may be defined in a specification, or may be applied only when a specific setting is made by an RRC parameter or the like. For example, one of the following options 1-0 to 1-3 is applied as the UL beam selection rule. The PHR in the present disclosure may be a PHR (UL PHR) that takes MPE into consideration.

[0056] In this disclosure, UL RSRP (UL's RSRP) is P UEtx -PL=P UEtx -(DL P BS -DL RSRP). UEtx is the UE transmit power, which may be determined using UL fast Transmission Power Control (TPC) and P-MPR based on MPE. PL is the path loss, and DL P BS is the DL transmission power at the base station.

[0057] In the present disclosure, the reported UL beam quality may be at least one of RSRP, PHR, and MPE (MPR) of the UL (UL beam). The reported DL beam quality may be at least one of RSRP and SINR of the DL (DL beam).

[0058] [Option 1-0] The UE may select the N_U beams to report based on the UL beam quality.

[0059] [Option 1-1] The UE may select N_U beams to report based on the DL beam quality and transmit the UL beam quality of the selected beams. For the selected beams, the UE may map them to the beam report based on the order of the UL beam quality (e.g., RSRP / PHR / MPR). Alternatively, the UE may map the UL beams to the beam report based on the order of the UL beam quality.

[0060] [Option 1-2] The UE may obtain (select) the first M UL beams based on DL beam quality, where M may be configured by higher layer signaling (e.g., RRC) or defined in a specification. The UE may select up to M UL beams based on a comparison of a value related to DL beam quality (e.g., RSRP value) with a threshold configured by higher layer signaling or defined in a specification.

[0061] The UE may then select N_U UL beams from among the M beams based on UL beam quality. For example, the UE may map UL beams from among the M beams to beam reports based on the order of UL beam quality (e.g., RSRP / PHR / MPR). Alternatively, the UE may map UL beams to beam reports based on the order of DL beam quality.

[0062] [Options 1-3] The UE may obtain (select) the first M UL beams based on the UL beam quality, where M may be configured by higher layer signaling (e.g., RRC) or defined in a specification. The UE may select up to M UL beams based on a comparison of the UL beam quality (e.g., RSRP / SINR / PHR / MPR) with a threshold configured by higher layer signaling or defined in a specification.

[0063] Then, the UE may select N_U UL beams from among the M beams based on the DL beam quality. The UE may map the UL beams to beam reports based on the order of the DL beam quality (e.g., RSRP / SINR). Alternatively, the UE may map the UL beams to beam reports based on the order of the UL beam quality.

[0064] The content of the UL beam report may include at least one of the content of described above. The reported UL beam index / UL beam quality may correspond to the UL beam selected by any of the above options.

[0065] The UE may apply any of the options when specific conditions are met. For example, when the UL RSRP, PHR, or MPR corresponding to all beams exceeds the corresponding threshold or the number of beams exceeding the threshold is greater than or equal to a predetermined value, the UE may apply Options 1-3, and in other cases, may apply Options 1-0 / 1-1 / 1-2.

[0066] Alternatively, the UE may select the UL beam based on the calculation result (e.g., total value / average value, etc.) using the value related to the DL beam quality and the value related to the UL beam quality.

[0067] [Specific Example] FIG. 4 is a diagram showing examples of DL and UL beam qualities. FIG. 4 shows graphs of each DL beam quality (DL RSRP / SINR) and the corresponding UL beam quality (UL RSRP / PHR) as beam quality. In the specific example, it is assumed that N_U is 4. In the specific example of the present disclosure, DL RSRP / SINR is used as the DL beam quality and UL RSRP / PHR is used as the UL beam quality, but other examples may also be used.

[0068] When option 1-1 is applied, the UE selects beams 1 / 2 / 3 / 4 based on the DL RSRP / SINR and maps them to the beam report in the order of beams 2, 1, 4, and 3 based on the UL RSRP / PHR.

[0069] When option 1-2 is applied, the UE selects beams 1 / 2 / 3 / 4 / 5 / 6 (M=6) based on the DL RSRP / SINR, and from among them, selects beams 6 / 5 / 2 / 1 based on the UL RSRP / PHR, and maps them to the beam report in the order of beams 6, 5, 2, and 1.

[0070] When options 1-3 are applied, the UE selects beams 6 / 5 / 2 / 7 / 1 / 8 (M=6) based on the UL RSRP / PHR, and from among them, selects beams 1 / 2 / 5 / 6 based on the DL RSRP / SINR, and may map them to the beam report in the order of beams 1, 2, 5, and 6.

[0071] According to the present disclosure, UL beam selection can be performed taking into consideration not only UL beam quality but also DL beam quality, allowing an appropriate beam to be selected.

[0072] <Second embodiment> When a beam report includes both a DL beam report (e.g., DL RSRP / SINR) and a UL beam report (e.g., UL RSRP / PHR / MPR) (joint beam report), the UE may receive a configuration for the number of DL beam reports (N_D) and the number of UL beam reports (N_U). A common number or different numbers may be configured for N_D and N_U. The UE may transmit a beam report including (N_D) DL beam qualities corresponding to the number of DL beam reports in the configuration, and (N_U) UL beam qualities corresponding to the number of UL beam reports in the configuration.

[0073] Beam Selection Rules The UE may independently select a DL beam and a UL beam to report. For example, the UE may select a DL beam based on DL beam quality (e.g., DL RSRP / SINR) and a UL beam based on UL beam quality (e.g., RSRP / PHR / MPR). The UE may select one or more (N_D) DL beams in descending order of corresponding DL beam quality, and select one or more (N_U) UL beams in descending order of corresponding UL beam quality. The beam selection rule may be the same as that described in the first embodiment.

[0074] [Beam Report Contents] [Option 2-1-1] The beam report includes a DL beam index and a value related to DL beam quality (e.g., RSRP / SINR) for each of the N_D DL beams. Additionally, the beam report includes a UL beam index and a value related to UL beam quality (e.g., RSRP / PHR / MPR) for each of the N_U UL beams.

[0075] [Option 2-1-2] The beam report includes, for each of the (N_D+N_U) beams, a beam index, a value related to DL beam quality (e.g., RSRP / SINR), and a value related to UL beam quality (e.g., RSRP / PHR / MPR).

[0076] [CSI field mapping order and quantization] [Option 2-2-1] In beam reporting, N_D DL beam indices, N_D DL beam quality values, N_U UL beam indices, and N_U UL beam quality values ​​are mapped in this order. The mapping order of DL beam indices and DL beam quality values ​​follows the order of DL beam quality. The mapping order of UL beam indices and UL beam quality values ​​follows the order of UL beam quality. Option 2-1-1 applies to beam selection.

[0077] The value for the first DL beam quality is the value for the maximum DL beam quality and is quantized with a larger bit size (e.g., 7 bits). The values ​​for the remaining DL beam qualities may be differential values ​​from the value for the maximum DL beam quality and are quantized with a smaller bit size (e.g., 4 bits). The value for the first UL beam quality is the value for the maximum UL beam quality and is quantized with a larger bit size (e.g., 7 bits). The values ​​for the remaining UL beam qualities may be differential values ​​from the value for the maximum UL beam quality and are quantized with a smaller bit size (e.g., 4 bits).

[0078] [Option 2-2-2] The mapping is in the order of N_D DL beam indices, N_U UL beam indices, N_D values ​​related to DL beam quality, and N_U values ​​related to UL beam quality. The order of DL beam indices and values ​​related to DL beam quality follows the DL beam quality. The order of UL beam indices and values ​​related to UL beam quality follows the UL beam quality. The arrangement of maximum / difference values, quantization, number of bits, etc. are the same as in Option 2-2-1. Option 2-1-1 applies to beam selection.

[0079] [Option 2-2-3] The (N_D+N_U) beam indices are mapped in the order of DL beam quality and UL beam quality. Option 2-1-2 is applied to beam selection.

[0080] [Specific example] Fig. 5 is a diagram showing a first example of a beam report according to the second embodiment. The beam report in Fig. 5 is based on the beam quality in Fig. 4, and assumes that N_D=2 and N_U=2. The example in Fig. 5 also follows options 2-1-1 and 2-2-1.

[0081] The UE selects beam1 and beam2 with the highest DL beam quality from among the DL beams, and includes in the beam report, in descending order of DL beam quality, beam1, beam2, the DL RSRP / SINR (absolute value) of beam1, and the DL RSRP / SINR (differential value) of beam2. The DL RSRP / SINR of beam2 may be an absolute value.

[0082] Furthermore, the UE selects beam6 and beam5, which have the highest UL beam quality, from among the UL beams, and includes in the beam report, in descending order of UL beam quality, beam6, beam5, the UL RSRP / SINR (absolute values) of beam6, and the UL RSRP / SINR (differential value) of beam5. The UL RSRP / SINR of beam5 may be an absolute value.

[0083] The beam index (beam1, 2, 5, 6) may be expressed, for example, as "CRI or SSBRI or SRI #X or TCI state #X" (X=1, 2, 5, 6).

[0084] Fig. 6 is a diagram showing a second example of a beam report according to the second embodiment. The beam report in Fig. 6 is based on the beam quality in Fig. 4, with N_D=2 and N_U=2. The example in Fig. 6 also follows options 2-1-1 and 2-2-2. In the example in Fig. 6, the contents included in the CSI report are the same as those in the example in Fig. 5, but the mapping order is different. In Fig. 6, the beam index, the value related to DL beam quality, and the value related to UL beam quality are mapped in this order.

[0085] According to this embodiment, the UE reports a UL beam along with a DL beam in a CSI report, and when N_D and N_U are set, the UE can create / send an appropriate beam report taking into account the DL beam quality and the UL beam quality, respectively.

[0086] <Third embodiment> When a beam report includes both a DL beam report (e.g., DL RSRP / SINR) and a UL beam report (e.g., UL RSRP / PHR / MPR) (joint beam report), the UE may receive a setting for the total number (N_all) of DL beam reports (N_D) and UL beam reports (N_U). The UE may transmit a beam report including DL beam quality and UL beam quality according to the total number. In this case, individual settings for N_D and N_U are not required.

[0087] Beam Selection Rules [Option 3-1-0] The UE may select the N_all beams to report based on the UL beam quality.

[0088] [Option 3-1-1] The UE may select the N_all beams to report based on the DL beam quality.

[0089] [Option 3-1-2] The UE may obtain (select) the first M beams based on DL beam quality. M may be configured by higher layer signaling (e.g., RRC) or may be defined in a specification. The UE may select up to M beams based on a comparison of a value related to DL beam quality (e.g., an RSRP value) with a threshold configured by higher layer signaling or defined in a specification. The UE may then select the first N_all beams from the M beams based on UL beam quality.

[0090] [Option 3-1-3] The UE may obtain (select) the first M beams based on UL beam quality. M may be configured by higher layer signaling (e.g., RRC) or may be defined in a specification. The UE may select up to M beams based on a comparison between a threshold configured by higher layer signaling or defined in a specification and a value related to UL beam quality (e.g., RSRP / PHR / MPR value). Then, the UE may select the first N_all beams from the M beams based on DL beam quality.

[0091] [CSI reporting content, CSI field mapping order, and quantization] [Option 3-2-1] The beam report may include N_all beam indices, and for each beam, a value for DL ​​beam quality and a value for UL beam quality.

[0092] [Option 3-2-1-1] In beam reporting, the order of mapping is N_all beam indices, N_all values ​​related to DL beam quality, and N_all values ​​related to UL beam quality. The order of beam indices, values ​​related to DL beam quality, and values ​​related to UL beam quality is based on DL beam quality.

[0093] The first DL beam quality value is the best DL beam quality value (e.g., RSRP / SINR) and is quantized with a larger bit size (e.g., 7 bits). The remaining DL beam quality values ​​may be differential values ​​from the best DL beam quality value and are quantized with a smaller bit size (e.g., 4 bits). The UL beam quality values ​​may be absolute values ​​using the same bit size, since the first value is not necessarily the largest.

[0094] [Option 3-2-1-2] Based on Option 3-2-1-1, the order of N_all DL beam quality values ​​and N_all UL beam quality values ​​may be reversed, i.e., N_all beam indices, N_all UL beam quality values, and N_all DL beam quality values ​​may be mapped in that order.

[0095] Based on Option 3-2-1-1, beam reporting may be applied in which values ​​related to DL beam quality and values ​​related to UL beam quality are alternately mapped, for example, in the order of N_all beam indices, value related to DL beam quality of the first beam, value related to UL beam quality of the first beam, value related to DL beam quality of the second beam, value related to UL beam quality of the second beam, etc.

[0096] In option 3-2-1-2, the quantized bit size, the distinction between differential value and absolute value, etc. are the same as in option 3-2-1-1.

[0097] [Option 3-2-1-3] In beam reporting, the order of mapping is N_all beam indices, N_all values ​​related to UL beam quality, and N_all values ​​related to DL beam quality. The order of beam indices, values ​​related to UL beam quality, and values ​​related to DL beam quality follows the UL beam quality.

[0098] The first UL beam quality value is the best UL beam quality value (e.g., RSRP / PHR / MPR) and is quantized with a larger bit size (e.g., 7 bits). The remaining UL beam quality values ​​may be differential values ​​from the best UL beam quality value and are quantized with a smaller bit size (e.g., 4 bits). The DL beam quality values ​​may be absolute values ​​using the same bit size, since the first value is not necessarily the largest.

[0099] [Option 3-2-1-4] Based on Option 3-2-1-3, the order of N_all DL beam quality values ​​and N_all UL beam quality values ​​may be reversed, i.e., N_all beam indices, N_all DL beam quality values, and N_all UL beam quality values ​​may be mapped in this order.

[0100] Based on Option 3-2-1-3, beam reporting may be applied in which values ​​related to UL beam quality and values ​​related to DL beam quality are alternately mapped. For example, the mapping may be in the order of N_all beam indices, value related to UL beam quality of the first beam, value related to DL beam quality of the first beam, value related to UL beam quality of the second beam, value related to DL beam quality of the second beam, etc. In other words, values ​​related to UL beam quality and values ​​related to DL beam quality may be alternately mapped. The quantized bit size, distinction between differential value and absolute value, etc. are the same as in Option 3-2-1-3.

[0101] [Option 3-2-2] The beam report includes N_all beam indices, a value for DL ​​beam quality and a value for UL beam quality for each beam, and may further include information indicating the beam corresponding to the best DL beam quality or the beam corresponding to the strongest (largest) UL beam quality.

[0102] [Option 3-2-2-1] The beam report may include information indicating the best UL beam quality (e.g., beam index) before or after the N_all beam indexes based on Option 3-2-1-1 and Option 3-2-1-2. The value for the best UL beam quality may be quantized with a larger bit size (e.g., 7 bits), and the values ​​for the remaining UL beam qualities may be differential values ​​from the maximum UL beam quality value and may be quantized with a smaller bit size (e.g., 4 bits).

[0103] This allows the beam with the best UL beam quality to be specified even when the beam index is in the order of DL beam quality, as in Option 3-2-1-1 and Option 3-2-1-2.

[0104] [Option 3-2-2-2] The beam report may include information indicating the best DL beam quality (e.g., beam index) before or after the N_all beam index based on options 3-2-1-3 and 3-2-1-4. The value for the best DL beam quality may be quantized with a larger bit size (e.g., 7 bits), and the values ​​for the remaining DL beam qualities may be differential values ​​from the maximum DL beam quality value and may be quantized with a smaller bit size (e.g., 4 bits).

[0105] This makes it possible to specify the beam with the best DL beam quality even when the beam index is in the order of UL beam quality, as in Option 3-2-1-3 and Option 3-2-1-4.

[0106] [Specific example] Figure 7 is a diagram showing an example of CSI reporting in option 3-2-1-1. "CRI or SSBRI or SRI #X or TCI state #X" corresponds to the beam index. Note that in each example of Figures 7 to 12, X = 1 to N_all. The beam indexes are arranged in the order of the corresponding DL beam quality. "RSRP / SINR #X" corresponds to the absolute value of the best DL beam quality, and "Differential RSRP / SINR #X" corresponds to the differential value of the DL beam quality. "UL RSRP / PHR #X" corresponds to the UL beam quality.

[0107] Figure 8 is a diagram showing an example of CSI reporting in option 3-2-1-2. The order of the values ​​related to UL beam quality and DL beam quality is reversed from that in Figure 7, but the rest is the same.

[0108] Figure 9 shows an example of CSI reporting in option 3-2-1-3. As in Figure 7, "CRI or SSBRI or SRI #X or TCI state #X" corresponds to the beam index. The beam indexes are arranged in order of the corresponding UL beam quality. "UL RSRP / PHR #X" corresponds to the absolute value of the best UL beam quality, and "Differential UL RSRP / PHR #X" corresponds to the differential value of the UL beam quality. "RSRP / SINR #X" corresponds to the DL beam quality.

[0109] 10 is a diagram showing an example of CSI reporting in Option 3-2-1-4. The order of the values ​​related to UL beam quality and DL beam quality is reversed from that in FIG. 9, but the rest is the same.

[0110] Figure 11 is a diagram showing an example of a CSI report in Option 3-2-2-1. After the N_all beam indices, information indicating the best UL beam quality, "An indication of strongest UL RSRP / PHR," is included. This information may be the beam index corresponding to the best UL beam quality, "CRI or SSBRI or SRI #2 or TCI state #2." In Figure 11, this information corresponds to "UL RSRP / PHR #2." In Figure 11, the order of the values ​​related to DL beam quality and UL beam quality may be reversed.

[0111] Figure 12 is a diagram showing an example of CSI reporting in Option 3-2-2-2. After the N_all beam indices, information indicating the best DL beam quality, "An indication of strongest DL RSRP / SINR beam," is included. This information may be the beam index corresponding to the best DL beam quality, "CRI or SSBRI or SRI #N_all or TCI state #N_all." In Figure 12, this information corresponds to "RSRP / SINR #N_all." In Figure 12, the order of the values ​​related to DL beam quality and UL beam quality may be reversed.

[0112] According to this embodiment, the UE reports a UL beam along with a DL beam in a CSI report, and can create / transmit an appropriate beam report by taking into account the DL beam quality and the UL beam quality, respectively, even when the total number of N_D and N_U is set.

[0113] <Other> In the present disclosure, the beam index may be, for example, an SSB / CSI-RS / SRS index / TCI state ID. The beam index may be set / reported together with other indexes (IDs) such as a panel ID / RS group ID / antenna group ID, or may not be set / reported together with other indexes.

[0114] The UL PHR in the present disclosure may be calculated by taking into account the P-MPR value of the MPE of each beam and the TPC / PL-RS for each beam, in addition to the same calculation method as the actual PHR or virtual PHR.

[0115] When a UL beam report (first embodiment) or a joint DL / UL beam report (second or third embodiment) is transmitted by a MAC CE rather than a UCI, the same beam selection rules, mapping order rules in the MAC CE, and quantization rules for measured DL / UL values ​​as in each example of the present disclosure may be applied to the MAC CE.

[0116] The new beam report in the present disclosure may be applied to at least one UE triggered by periodic / aperiodic / semi-persistent CSI set by the NW and MPE for each cell / panel / beam.

[0117] <UE capability> The UE may transmit (report) UE capability information indicating whether it supports at least one of each process in the present disclosure to the network (base station). Also, the UE may receive information for instructing / setting at least one of each process in the present disclosure by DCI / MAC CE / higher layer signaling (e.g., RRC), etc. The information may correspond to the UE capability information transmitted by the UE. The UE capability information may include, for example, at least one of the following (1) to (3).

[0118] (1) Whether to consider DL beam quality when selecting a UL beam to report an MPE problem. (2) Whether to support both the DL RSRP / SINR value and the UL RSRP / PHR value of the beam for CSI reporting. (3) The maximum number of N_D / D_U / N_all in the CSI report.

[0119] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0120] FIG. 13 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0121] 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.

[0122] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0123] 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 the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0124] 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.

[0125] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0126] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0127] 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.

[0128] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, 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.

[0129] 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.

[0130] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0131] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio 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).

[0132] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0133] 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.

[0134] 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)), etc. may be used as an uplink channel.

[0135] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0136] 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.

[0137] 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 an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0138] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0139] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0140] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement 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.

[0141] 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.

[0142] 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, 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 as DL-RS.

[0143] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and 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 reference signals.

[0144] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0145] (base station) 14 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.

[0146] 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.

[0147] 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.

[0148] 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 to be transmitted as signals, control information, sequences, etc., 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.

[0149] 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.

[0150] The transmitting / receiving unit 120 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 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0151] 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 pertains, such as an array antenna.

[0152] 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.

[0153] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0154] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0155] The transceiver 120 (transmission processor 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.

[0156] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0157] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0158] 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.

[0159] 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.

[0160] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0161] 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.

[0162] The control unit 110 may assume that the beam to be reported is selected by the terminal based on at least one of the uplink (UL) beam quality and the downlink (DL) beam quality.

[0163] In addition, the transceiver unit 120 may receive a beam report including at least one of the UL beam quality and DL beam quality of the selected beam.

[0164] (user terminal) 15 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.

[0165] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, 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.

[0166] 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, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0167] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also 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.

[0168] 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 from 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.

[0169] 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.

[0170] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0171] 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.

[0172] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0173] The transceiver 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.

[0174] The transceiver 220 (transmission processor 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.

[0175] 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 when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0176] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0177] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0178] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0179] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, 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.

[0180] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0181] The control unit 210 may select a beam to be reported based on at least one of the uplink (UL) beam quality and the downlink (DL) beam quality.

[0182] The transceiver 220 may transmit a beam report including at least one of the UL beam quality and DL beam quality of the selected beam.

[0183] The control unit 210 may select a beam to be reported based on the DL beam quality, and the transceiver unit 220 may transmit the beam report including the UL beam quality of the selected beam.

[0184] When the beam report includes a DL beam report and a UL beam report, the transceiver 220 may receive settings for the number of DL beam reports and the number of UL beam reports, respectively. The transceiver 220 may transmit the beam report including the DL beam quality corresponding to the number of DL beam reports and the UL beam quality corresponding to the number of UL beam reports.

[0185] When the beam report includes a DL beam report and a UL beam report, the transceiver 220 may receive a setting for the total number of DL beam reports and the total number of UL beam reports. The transceiver 220 may transmit the beam report including the DL beam quality and the UL beam quality according to the total number.

[0186] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. 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 also be realized by combining the single device or multiple devices with software.

[0187] 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 mentioned above, the implementation method of each is not particularly limited.

[0188] 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. 16 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.

[0189] In the present disclosure, terms such as apparatus, circuit, device, section, and unit 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.

[0190] 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.

[0191] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as 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.

[0192] 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), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0193] 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 realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0194] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0195] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact 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, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0196] 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.

[0197] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0198] 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.

[0199] 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 such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0200] (Variation) Note that terms explained 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.

[0201] 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.

[0202] 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, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0203] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0204] 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.

[0205] 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.

[0206] 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 a subframe and a 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.

[0207] 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. However, the definition of TTI is not limited to this.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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 equal to or greater than 1 ms.

[0212] 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 also be determined based on numerology.

[0213] 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. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0214] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0215] 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.

[0216] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a 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 given BWP and numbered within that BWP.

[0217] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0218] 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."

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, 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.

[0226] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called 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).

[0227] 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).

[0228] 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).

[0229] 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.

[0230] 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), then these wired and / or wireless technologies are included within the definition of transmission media.

[0231] 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).

[0232] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0233] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0234] 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 divided 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 term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0235] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0236] 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.

[0237] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. 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). 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.

[0238] 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 uplink channel and downlink channel may be read as sidelink channel.

[0239] 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.

[0240] 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) and a Serving-Gateway (S-GW)), or a combination thereof.

[0241] 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 specific order presented.

[0242] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0243] 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."

[0244] 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.

[0245] 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.

[0246] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0247] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0248] 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."

[0249] 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.

[0250] 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."

[0251] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0252] 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.

[0253] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. When the beam report includes a downlink (DL) beam report and an uplink (UL) beam report, a receiving unit that receives settings of the number of DL beam reports and the number of UL beam reports; a control unit that selects a beam to be reported based on at least one of a UL Reference Signal Received Power (RSRP) and a DL RSRP; A transmitting unit that transmits a beam report including the DL RSRP corresponding to the number of DL beam reports of the selected beam and the UL RSRP corresponding to the number of UL beam reports; A terminal having:

2. When the beam report includes a downlink (DL) beam report and an uplink (UL) beam report, receiving a setting of the number of DL beam reports and the number of UL beam reports; selecting a beam to report based on at least one of an UL Reference Signal Received Power (RSRP) and a DL RSRP; transmitting a beam report including the DL RSRP of the selected beam according to the number of DL beam reports and the UL RSRP according to the number of UL beam reports; A wireless communication method for a terminal having the above configuration.

3. A transmitting unit that transmits settings of the number of DL beam reports and the number of UL beam reports when the beam report includes a downlink (DL) beam report and an uplink (UL) beam report; A receiver that selects a beam to be reported by a terminal based on at least one of an UL Reference Signal Received Power (RSRP) and a DL RSRP, and receives a beam report including the DL RSRP of the selected beam according to the number of DL beam reports and the UL RSRP according to the number of UL beam reports; A base station having

4. A system including a terminal and a base station, The terminal A receiving unit that receives a setting of the number of DL beam reports and the number of UL beam reports when the beam report includes a downlink (DL) beam report and an uplink (UL) beam report; a control unit that selects a beam to be reported based on at least one of a UL Reference Signal Received Power (RSRP) and a DL RSRP; A transmitting unit that transmits a beam report including the DL RSRP corresponding to the number of DL beam reports of the selected beam and the UL RSRP corresponding to the number of UL beam reports, The base station a receiver for receiving the beam report; system.

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