Terminal, wireless communication method and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a control unit that determines a priority related to a channel state information (CSI) report based on a CSI report group index; and a sending unit that sends a CSI report selected based on the priority from a plurality of conflicting CSI reports. According to one embodiment of the present disclosure, CSI reporting can be appropriately implemented even when multiple TRPs or panels are used.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9)).

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

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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

[0007] Problems to be solved by the invention

[0008] In NR, the user terminal (User Equipment (UE)) measures the channel state based on the resources of reference signals such as the Channel State Information Reference Signal (CSI-RS) and feeds back (reports) the Channel State Information (CSI) to the network (e.g., base station).

[0009] In addition, in NR, one or more transmission / reception points (Transmission / ReceptionPoint (TRP)) (multi TRP (multi TRP (M-TRP))) using one or more panels (multi-panels) to perform DL transmission to the UE is being studied. In addition, the UE is studying the use of one or more panels to perform UL transmission to one or more TRPs.

[0010] However, in the NR specifications to date, the control of CSI reporting in the case of multiple panels / TRPs has not been fully studied. For example, the existing CSI priority does not take TRP into consideration. Therefore, if the existing CSI priority is used, CSI reporting cannot be properly performed in the case of multiple TRPs, which may reduce throughput or degrade communication quality.

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately implement CSI reporting even when using multiple TRPs or panels.

[0012] Means for solving problems

[0013] A terminal according to one embodiment of the present disclosure includes: a control unit that determines a priority related to a channel state information (CSI) report based on a CSI report group index; and a transmission unit that transmits a CSI report selected based on the priority from among a plurality of conflicting CSI reports.

[0014] Effects of the Invention

[0015] According to one embodiment of the present disclosure, CSI reporting can be appropriately implemented even when multiple TRPs or panels are used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figures 1A to 1D This is a diagram showing an example of determining PUCCH resources for sending CSI reports in Rel.15 / 16 NR.

[0017] Figure 2 This is a diagram showing an example of a multi-TRP scenario.

[0018] Figure 3 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0019] Figure 4 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0020] Figure 5 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0021] Figure 6 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment. DETAILED DESCRIPTION

[0022] (CSI)

[0023] In NR, the UE measures the channel state based on the resources of reference signals such as the Channel State Information Reference Signal (CSI-RS) and feeds back (reports) the Channel State Information (CSI) to the network (e.g., base station).

[0024] In addition, CSI may also include at least one of a channel quality indicator (Channel Quality Indicator (CQI)), a precoding matrix indicator (Precoding Matrix Indicator (PMI)), a CSI-RS resource indicator (CSI-RSResource Indicator (CRI)), a SS / PBCH block resource indicator (SS / PBCH Block Resource Indicator (SSBRI)), a layer indicator (Layer Indicator (LI)), a rank indicator (Rank Indicator (RI)), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), L1-SNR (Signal to Noise Ratio), etc.

[0025] As a CSI feedback method, periodic CSI (Periodic CSI (P-CSI)) reporting, aperiodic CSI (Aperiodic CSI (A-CSI)) reporting, semi-persistent CSI (Semi-Persistent CSI (SP-CSI)) reporting, etc. are being studied.

[0026] The UE may also be notified of the CSI measurement setting information using higher layer signaling, physical layer signaling, or a combination thereof.

[0027] In the present disclosure, high-layer signaling may also be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0028] MAC signaling may use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (PDU), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (OSI), etc.

[0029] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0030] The CSI measurement configuration information may also be configured using, for example, the RRC information element "CSI-MeasConfig". The CSI measurement configuration information may also include CSI resource configuration information (RRC information element "CSI-ResourceConfig"), CSI report configuration information (RRC information element "CSI-ReportConfig"), etc. The CSI resource configuration information is associated with the resources used for CSI measurement, and the CSI report configuration information is associated with how the UE implements CSI reporting.

[0031] The CSI report configuration information ("CSI-ReportConfig") includes resource information for channel measurement ("resourcesForChannelMeasurement"). In addition, the CSI report configuration information may also include resource information for interference measurement (for example, non-zero power (Non-Zero Power (NZP)) CSI-RS resource information for interference measurement ("nzp-CSI-RS-ResourcesForInterference"), CSI-Interference Management (IM) resource information for interference measurement ("csi-IM-ResourcesForInterference"), etc.). These resource information correspond to the ID (Identifier) ​​("CSI-ResourceConfigId") of the CSI resource configuration information.

[0032] In addition, one or more IDs of CSI resource configuration information corresponding to each resource information (may also be referred to as CSI resource configuration ID) may be the same value or different values.

[0033] The CSI resource configuration information ("CSI-ResourceConfig") may also include a CSI resource configuration information ID, CSI-RS resource set list information ("csi-RS-ResourceSetList"), a resource type ("resourceType"), etc. The CSI-RS resource set list may also include at least one of the information of the NZP CSI-RS and SSB used for measurement ("nzp-CSI-RS-SSB") and the CSI-IM resource set list information ("csi-IM-ResourceSetList").

[0034] The resource type indicates the time domain operation of the CSI-RS resource setting, which can be set to "aperiodic", "semi-persistent", or "periodic". The corresponding CSI-RS can also be called A-CSI-RS, SP-CSI-RS, or P-CSI-RS.

[0035] In addition, the channel measurement resources may be used, for example, in the calculation of CQI, PMI, L1-RSRP, etc. In addition, the interference measurement resources may be used in the calculation of L1-SINR, L1-SNR, L1-RSRQ, and other interference-related indices.

[0036] (Priority level associated with CSI reporting)

[0037] In Rel.15 / 16NR, a CSI report (also referred to as a CSI report, CSI feedback, etc.) may also be associated with a priority value. For example, the priority value may also be associated with a priority value using the function Pri iCSI (y, k, c, s) is defined. This priority can also be replaced with CSI report priority, CSI priority, etc.

[0038] Here, y can also be a value based on the type of CSI report (A-CSI report, SP-CSI report, or P-CSI report) and the channel for sending the CSI report (uplink shared channel (Physical Uplink Shared Channel (PUSCH))) or uplink control channel (Physical Uplink Control Channel (PUCCH)))).

[0039] For example, if it is an A-CSI report transmitted via PUSCH, y=0; if it is an SP-CSI report transmitted via PUSCH, y=1; if it is an SP-CSI report transmitted via PUCCH, y=2; and if it is a P-CSI report transmitted via PUCCH, y=3.

[0040] k may also be a value based on whether the CSI report includes L1-RSRP / SINR (for example, if the CSI report includes L1-RSRP / SINR, k=0, if not, k=1). c may also be a serving cell index. s may also be a report configuration ID (reportConfigID).

[0041] For example, Pri iCSI (y, k, c, s) can also be obtained by the following formula 1.

[0042] (Formula 1)

[0043] Pri iCSI (y, k, c, s) = 2·N cells ·M s y+N cells ·M s ·k+M s ·c+s

[0044] Here, it can also be, N cells is the maximum number of serving cells (higher layer parameter maxNrofServingCells), M sIt is the value of the maximum number of CSI report configurations that are configured (higher layer parameter maxNrofCSI-ReportConfigurations).

[0045] In the Pri associated with the first CSI report iCSI The value of (y, k, c, s) is less than the Pri associated with the second CSI report iCSI In the case of the values ​​of (y, k, c, s), it may also mean that the first CSI report has a higher priority than the second CSI report.

[0046] (Conflict reported by CSI)

[0047] In Rel.15 / 16 NR, when the time occupancy of physical channels (e.g., PUCCH, PUSCH) scheduled for transmitting two CSI reports overlaps in at least one Orthogonal Frequency Division Multiplexing (OFDM) symbol and is sent in the same carrier, the two CSI reports are said to collide.

[0048] In the case where the UE is configured to send two conflicting CSI reports, if the value of y (in the priority formula) between the two CSI reports is different, the following rule applies: the CSI report with the higher priority value is not sent by the UE, except for the case where the value of y for one is 2 and the value of y for the other is 3. In this case, the two CSI reports can be multiplexed or one can be dropped based on the priority value.

[0049] When multiple PUCCH resources are configured in one time slot for sending a CSI report, and no list of PUCCH resources for multiple CSIs is provided (RRC parameter "multi-CSI-PUCCH-ResourceList") or the multiple PUCCH resources do not overlap in the one time slot, the UE determines the first resource corresponding to the CSI report with the highest priority.

[0050] Here, when the first resource includes PUCCH format 2 and there are remaining resources in the above-mentioned one time slot that do not overlap with the first resource, the UE decides to select the CSI report with the highest priority from the CSI reports with corresponding resources from the remaining resources, and determines the corresponding second resource as an additional resource for the CSI report.

[0051] In addition, when the first resource includes PUCCH format 3 or PUCCH format 4 and there are remaining resources in the above-mentioned one time slot that do not overlap with the first resource and include PUCCH format 2, the UE decides to select the CSI report with the highest priority from the CSI reports with corresponding resources from the remaining resources, and determines the corresponding second resource as an additional resource for the CSI report.

[0052] When multiple PUCCH resources are configured in one time slot for sending CSI reports, and when a list of PUCCH resources for multiple CSIs is provided and the multiple PUCCH resources overlap in the one time slot, all CSI reports are multiplexed in one resource from the resources provided by the list.

[0053] In Rel.15 / 16NR, there are PF0 to 4 PFs (PUCCH formats), but at least one of PF2, 3, and 4 for uplink control information (UCI) of more than 2 bits is used in the CSI report. PF2 is transmitted over 1 or 2 symbols, and PF3 / 4 is transmitted over 4 or more symbols.

[0054] Figures 1A to 1D This is a diagram showing an example of determining the PUCCH resources for sending CSI reports in Rel.15 / 16 NR. In this example, a situation in which 4 PUCCH resources are configured for a UE in 1 time slot (14 symbols) is described. The priority (highest, second highest, third highest, fourth highest) of the scheduled CSI reports sent through each PUCCH resource is shown.

[0055] Figure 1A as well as Figure 1B An example is shown in which the UE does not provide a list of PUCCH resources for multiple CSIs (and a portion of the four PUCCH resources overlap). Figure 1C as well as Figure 1D An example is shown in which the four PUCCH resources do not overlap (in this example, any groups of PUCCH resources do not overlap).

[0056] The UE determines the CSI report with the highest priority, and determines the PUCCH resource corresponding to the CSI report as the first resource. Figure 1A , Figure 1C In the example, the PUCCH resource of PF2 is determined as the first resource. Figure 1B , Figure 1D In the example, the PUCCH resource of PF3 / 4 is determined as the first resource.

[0057] Figure 1AIn the example, the UE determines the PUCCH resource corresponding to the CSI report with the highest priority (the third priority overall) among the CSI reports of the resources that do not overlap with the first resources as the second resource.

[0058] Figure 1B In the example, the UE determines the PUCCH resource corresponding to the CSI report with the highest priority (the fourth priority overall) in the CSI report that does not overlap with the first resource and includes the resources of PF2 as the second resource.

[0059] Figure 1C In the example, the UE determines the PUCCH resource corresponding to the CSI report with the highest priority (the second priority overall) among the CSI reports of the resources that do not overlap with the first resources as the second resource.

[0060] Figure 1D In the example, the UE determines the PUCCH resource corresponding to the CSI report with the highest priority (the fourth priority overall) in the CSI report that does not overlap with the first resource and includes the resources of PF2 as the second resource.

[0061] The UE may also use one or both of the determined first resources and second resources to report the CSI report.

[0062] (Multiple TRP)

[0063] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi TRP (M-TRP)) use one or more panels (multi-panels) to perform DL transmission to the UE. In addition, the UE is studying the use of one or more panels to perform UL transmission to one or more TRPs.

[0064] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0065] Figure 2 is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP and UE can utilize two different beams, but is not limited to this.

[0066] Multiple TRPs (TRP#1, #2) can also be connected through an ideal / non-ideal backhaul and exchange information, data, etc. Different code words (CW) and different layers can also be sent from each TRP of the multiple TRPs. As a form of multi-TRP transmission, non-coherent joint transmission (NCJT) can also be used.

[0067] In NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword, and uses a first precoding for a first number of layers (e.g., 2 layers) to send a first PDSCH. In addition, TRP2 performs modulation mapping and layer mapping on a second codeword, and uses a second precoding for a second number of layers (e.g., 2 layers) to send a second PDSCH.

[0068] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed can also be defined as partially or completely overlapping with respect to at least one of the time domain and the frequency domain. In other words, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP can also overlap.

[0069] It can also be assumed that the first PDSCH and the second PDSCH are not in a quasi-co-location (QCL) relationship (not quasi-co-located). The reception of multiple PDSCHs can also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (eg, QCL type D).

[0070] Based on one or more DCIs, the UE receives multiple PDSCHs (also referred to as multiple PDSCHs) from multiple TRPs. In addition, in this example, the UE is assumed to send different CSI reports (CSI reports) related to different TRPs. Such CSI feedback may also be referred to as separate feedback, separate CSI feedback, etc. In addition, CSI feedback that sends CSI reports related to two TRPs to one TRP may also be referred to as joint feedback, joint CSI feedback, etc.

[0071] Figure 2 In the example, the UE is configured to use a certain PUCCH (PUCCH1) to send a CSI report for TRP#1 for TRP#1, and to use another PUCCH (PUCCH2) to send a CSI report for TRP#2 for TRP#2.

[0072] Based on such a multi-TRP scenario, more flexible transmission control using channels with good quality can be performed.

[0073] However, in the NR specifications to date, the control of CSI reporting when multiple panels / TRPs are used has not been fully studied. For example, the existing CSI priority of formula 1 does not take TRP into consideration. Therefore, if the existing CSI priority is used, CSI reporting cannot be properly performed in the case of multiple TRPs, which may reduce throughput or degrade communication quality.

[0074] Therefore, the inventors of the present invention have come up with a method for appropriately performing CSI reporting. According to one method of the present disclosure, the UE can appropriately determine the CSI priority by associating it with the TRP.

[0075] In addition, in the present disclosure, “A / B” may mean “at least one of A and B”.

[0076] In the present disclosure, the panel, uplink (UL) transmission entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, specific antenna port (e.g., demodulation reference signal (DMRS)) port), specific antenna port group (e.g., DMRS port group), specific group (e.g., code division multiplexing (CDM)) group, specific reference signal group, CORESET group), CORESET pool, etc. can also be replaced with each other. In addition, the TRP identifier (Identifier (ID)) can also be replaced with TRP.

[0077] In the present disclosure, index, ID, indicator, resource ID, etc. may also be replaced with each other. In the present disclosure, beam, TCI, TCI state, DL TCI state, UL TCI state, unified TCI state, QCL, QCL assumption, spatial relationship, spatial relationship information, precoder, etc. may also be replaced with each other.

[0078] In the present disclosure, lists, groups, sets, subsets, clusters, etc. may also be used interchangeably.

[0079] (Wireless Communication Method)

[0080] One embodiment of the present disclosure is related to CSI priority. The CSI priority described below can be used when the UE is configured with multiple TRPs, and can also be used when CSI feedback (for multiple TRPs) uses separate feedback.

[0081] In the case of multiple TRPs, for CSI reports associated with different TRPs, the CSI priority can be calculated by the above formula 1 or by at least one of formulas 2 to 6. In the case of a conflict between CSI reports corresponding to multiple TRPs, the UE can also control the sending of CSI reports (or PUCCH resources for sending CSI reports) based on the priority corresponding to each CSI report.

[0082] (Formula 2)

[0083] Pri iCSI (y, k, c, s, p) = 2·N cells ·M s ·K p y+N cells ·M s ·K p ·k+M s ·K p ·c+K p ·s+p

[0084] (Formula 3)

[0085] Pri iCSI (y, k, c, p, s) = 2·N cells ·M s ·K p y+N cells ·M s ·K p ·k+M s ·K p ·c+K p ·p+s

[0086] (Formula 4)

[0087] Pri iCSI (y, k, p, c, s) = 2·N cells ·M s ·K p y+N cells ·M s ·K p k+N cells ·M s ·p+M s ·c+s

[0088] (Formula 5)

[0089] Pri iCSI (y, p, k, c, s) = 2·N cells ·M s ·K p ·y+2·Ncells ·M s ·p+N cells ·M s ·k+M s ·c+s

[0090] (Formula 6)

[0091] Pri iCSI (p, y, k, c, s) = 8·N cells ·M s ·p+2·N cells ·M s y+N cells ·M s ·k+M s ·c+s

[0092] Here, p may also represent a CSI report group index, for example, for a CSI report corresponding to the i-th (i is an integer) CSI report group index, p may be i-1. For example, for a first CSI report group index, p may be 0, and for a CSI report corresponding to a second CSI report group index, p may be 1.

[0093] The CSI report group index may also be set by at least one of a higher-layer parameter indicating a CSI report group index (ID) (eg, reportConfigGroupId), a higher-layer parameter indicating a CORESET pool index (eg, CORESETPoolIndex), and the like.

[0094] The CSI report group index may also be set by being included in at least one of the CSI report setting information ("CSI-ReportConfig"), CSI resource setting information ("CSI-ResourceConfig"), NZP CSI-RS resource set list information ("nzp-CSI-RS-ResourceSetList"), NZP CSI-RS resource information ("NZP-CSI-RS-Resource"), transmission setting indication status (TCI status (Transmission Configuration Indication state)), QCL information ("QCL-Info"), etc., which are RRC information elements.

[0095] The CSI report group index can also indicate the CSI report associated with the TRP (which TRP a certain CSI report (or CSI report setting, CSI resource setting, CSI-RS resource set, CSI-RS resource, TCI state, QCL, etc.) corresponds to). For example, the CSI report group index #i can also correspond to TRP#i.

[0096] The CSI report group index may also be replaced by a CSI group index, a value associated with a CSI report group, a CORESET pool index, etc.

[0097] In each formula, it is shown that a CSI report with relatively small p is sent preferentially compared to a CSI report with relatively large p, but it is not limited to this. Formulas 2 to 6 can also be modified to give priority to CSI reports with large p. In addition, constants (for example, "8" in Formula 6, etc.), parameters, etc. in each formula can also be replaced with other values, other parameters, etc. In addition, as a CSI priority, the following value can also be used: a value obtained by adding, subtracting, multiplying, and dividing an arbitrary value / parameter by the value derived by Formulas 1-6.

[0098] In each formula, the parameters described in Formula 1 may be the same as those in Formula 1. For example, y may also refer to a value determined by the type of CSI report, and k may also refer to a value determined by the content (CSI report content) sent by the CSI report. In addition, in the present disclosure, "CSI report type" may be replaced with "y". In addition, in the present disclosure, "CSI report content" may be replaced with "k".

[0099] When using Formula 1, the report configuration ID (reportConfigID) (in other words, s in Formula 1) may also correspond to multiple TRPs. In this case, the CSI priority values ​​of multiple CSI reports associated with different TRPs may also be the same.

[0100] When using Formula 1, the report configuration ID (reportConfigID) (in other words, s in Formula 1) may also correspond to one TRP (or TRP index). In this case, the value of the CSI priority may also indicate the priority of the TRP.

[0101] When using Formula 1, the report configuration ID (reportConfigID) (in other words, s in Formula 1) may also correspond to a TRP having a specific Interference Measurement Resource (IMR) configuration. In this case, the value of the CSI priority may also represent the priority of the TRP having the IMR hypothesis.

[0102] Regarding Equation 2 to Equation 6, for a CSI report for which a CSI report group index is not set, p may be a specific value (eg, a default value, p=0).

[0103] K pIt can also be the value of the maximum number of configured CSI report groups (also referred to as report configuration groups) (higher layer parameter maxNrofreportConfigGroups). p It can also be the set number or maximum number of TRPs.

[0104] Regarding equations 2 to 5, for a CSI report for which no CSI group index is set, K p It can also be a specific value (for example, default value, K p =1).

[0105] In Formula 2, for CSI reports with the same CSI report type, CSI report content, serving cell index, and report configuration ID, priority is given to the CSI report with a smaller p.

[0106] In Formula 3, for CSI reports with the same CSI report type, CSI report content, and serving cell index, the CSI report with a smaller p is prioritized.

[0107] In Formula 4, the coefficient of parameter y corresponding to the CSI report type (here, 2·N cells ·M s ·K p ) is greater than the coefficient of parameter p associated with the CSI reporting group (here, N cells ·M s ). In other words, in Formula 4, the priority value is determined more by the CSI report type than by the CSI report group. In other words, in Formula 4, the change in the priority value caused by a change of 1 in the value (y) determined by the CSI report type is greater than the change in the priority value caused by a change of 1 in the CSI report group index (p). In addition, in Formula 4, for CSI reports with the same CSI report type and CSI report content, the CSI report with a smaller p is prioritized.

[0108] In Formula 5, the coefficient of parameter y corresponding to the CSI report type (here, 2·N cells ·M s ·K p ) is greater than the coefficient of parameter p associated with the CSI reporting group (here, 2·N cells ·M s ). In other words, in Formula 5, the priority value is determined more by the CSI report type than by the CSI report group.

[0109] In Equation 6, the coefficient of the parameter (eg, p) associated with the CSI reporting group (here, 8·N cells ·M s ) is greater than the coefficient of parameter y corresponding to the CSI report type (here, 2·N cells ·Ms ). In other words, in Formula 6, the priority value is determined more by the CSI report group than by the CSI report type.

[0110] According to one embodiment described above, the CSI report associated with the TRP can be determined by the CSI priority. As a result, even when communicating using multiple TRPs, the UE can perform appropriate CSI reporting for the TRP.

[0111] (Wireless Communication System)

[0112] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0113] Figure 3 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0114] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0115] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0116] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0117] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0118] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0119] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0120] Furthermore, the user terminal 20 may perform communication in each CC by using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0121] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station may also be referred to as an IAB node.

[0122] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also 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.

[0123] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0124] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0125] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0126] In the wireless communication system 1, as downlink channels, 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)) and the like may be used.

[0127] In addition, in the wireless communication system 1, as uplink channels, 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)) and the like may be used.

[0128] The PDSCH is used to transmit user data, high-layer control information, system information block (SIB), etc. The PUSCH is also used to transmit user data, high-layer control information, etc. In addition, the PBCH is also used to transmit the master information block (MIB).

[0129] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0130] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0131] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0132] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0133] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., may also be called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) may also be transmitted through PUCCH. Random access preamble code for establishing connection with a cell may also be transmitted through PRACH.

[0134] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0135] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0136] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0137] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0138] (Base Station)

[0139] Figure 41 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0140] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0141] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0142] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0143] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0144] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0145] The transmitting / receiving antenna 130 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0146] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0147] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0148] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, to generate a bit string to be sent.

[0149] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0150] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0151] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0152] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0153] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (ReceivedSignal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0154] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0155] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0156] In addition, the transmitting and receiving unit 120 may also transmit the following CSI report group index to the user terminal 20 : the CSI report group index used in the user terminal 20 to determine the priority related to the Channel State Information (CSI) report.

[0157] In addition, the transmitting and receiving unit 120 may also receive the following CSI report: the CSI report selected and sent by the user terminal 20 from a plurality of conflicting CSI reports based on the priority.

[0158] (User Terminal)

[0159] Figure 5 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0160] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0161] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0162] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0163] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0164] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0165] The transmitting / receiving antenna 230 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0166] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0167] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0168] The sending and receiving unit 220 (sending processing unit 2211), for example, can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0169] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0170] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0171] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0172] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0173] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0174] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0175] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0176] In addition, the control unit 210 may also determine the priority associated with the Channel State Information (CSI) report based on the CSI report group index.

[0177] The transmitting and receiving unit 220 may also transmit a CSI report selected based on the priority from among a plurality of conflicting CSI reports.

[0178] The control unit 210 may also determine the priority for CSI reports having the same CSI report type, CSI report content, serving cell index, and report setting ID in such a way as to give priority to CSI reports having a smaller CSI report group index.

[0179] The control unit 210 may also determine the priority level for CSI reports having the same CSI report type, CSI report content, and report setting ID in such a way as to give priority to CSI reports having a smaller CSI report group index.

[0180] The control unit 210 may determine the priority level by assuming that a change in the priority level caused by a change in the value determined by the CSI report type by 1 is greater than a change in the priority level caused by a change in the CSI report group index by 1.

[0181] (Hardware Structure)

[0182] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0183] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0184] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 6 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0185] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0186] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0187] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0188] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0189] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that enables a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0190] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0191] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0192] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) can also be realized by physically or logically separating the transmitting unit and the receiving unit.

[0193] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0194] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or different buses may be used between the devices.

[0195] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0196] (Variation Example)

[0197] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc., depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0198] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0199] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0200] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0201] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0202] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0203] For example, a subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and a time slot or a mini time slot may also be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may also be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0204] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0205] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when 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 also be shorter than the TTI.

[0206] In addition, when a time slot or a mini time slot is called TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0207] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0208] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0209] 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 (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0210] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0211] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0212] In addition, a resource block may also be composed of one or more resource elements (RE). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

[0213] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0214] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0215] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific channel / signal other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0216] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0217] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0218] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0219] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0220] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0221] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0222] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0223] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0224] Furthermore, notification of specific information (for example, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (for example, by not notifying the specific information or by notifying other information).

[0225] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0226] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0227] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0228] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0229] 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", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0230] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0231] A base station can accommodate one or more (for example, 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 also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0232] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0233] There are also cases where a mobile station is 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, hand set, user agent, mobile client, client or some other appropriate terminology.

[0234] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0235] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0236] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0237] In the present disclosure, operations are assumed to be performed by a base station, and sometimes by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by a base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0238] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0239] The various modes and embodiments described in the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, 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 (Ultra Mobile Broadband (UMB)), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0240] The term “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the term “based on” means both “based only on” and “based at least on”.

[0241] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used, or that the first element must take precedence over the second element in some form.

[0242] The term "determining" as used in this disclosure may include a variety of operations. For example, "determining" may also be considered as "judging", calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc.

[0243] In addition, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0244] In addition, "judgment (decision)" can also be regarded as the situation of "judgment (decision)" on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as the situation of "judgment (decision)" on some actions.

[0245] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0246] The terms "connected", "coupled", or all their variations used in this disclosure mean all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be replaced by "access".

[0247] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0248] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0249] In the present disclosure, when the terms "include", "including", and variations thereof are used, these terms, like the term "comprising", have an inclusive meaning. Furthermore, the term "or" used in the present disclosure does not mean an exclusive OR.

[0250] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0251] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A control unit, which determines a priority value associated with a channel state information CSI report based on a report setting identifier ID of the CSI report; and a sending unit, configured to send a CSI report selected from a plurality of conflicting CSI reports based on the value of the priority, When the CSI report is sent using multiple transmission and reception points TRP, the report setting ID corresponds to the multiple TRPs.

2. The terminal according to claim 1, wherein: The priority value is the same for multiple CSI reports associated with different TRPs.

3. A wireless communication method of a terminal, comprising: The step of determining a priority value associated with a channel state information (CSI) report based on a reporting configuration identifier (ID) of the CSI report; and a step of transmitting a CSI report selected from a plurality of conflicting CSI reports based on the value of the priority, When the CSI report is sent using multiple transmission and reception points TRP, the report setting ID corresponds to the multiple TRPs.

4. A base station, comprising: A sending unit, configured to send a report setting identifier ID of a channel state information CSI report used in determining a priority value related to the CSI report to a terminal; a receiving unit, receiving a CSI report selected and sent by the terminal from a plurality of conflicting CSI reports based on the value of the priority; as well as A control unit, when the terminal uses multiple sending and receiving points TRP to send the CSI report, sets the report setting ID corresponding to the multiple TRPs.

5. A system comprising a terminal and a base station, The terminal has: A control unit, which determines a priority value associated with a channel state information CSI report based on a report setting identifier ID of the CSI report; as well as a sending unit, configured to send a CSI report selected from a plurality of conflicting CSI reports based on the value of the priority, When the CSI report is sent using multiple transmission and reception points TRP, the report setting ID corresponds to the multiple TRPs. The base station has: A sending unit, sending the report setting ID to the terminal; A receiving unit, receiving the CSI report; as well as The control unit sets the report setting ID.

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