CN115315975A - Terminal, wireless communication method, and base station - Google Patents

Abstract

A terminal according to an aspect of the present disclosure includes: a control unit deciding a priority related to a Channel State Information (CSI) report based on a CSI report group index; and a transmission unit configured to transmit a CSI report selected based on the priority from among the plurality of conflicting CSI reports. According to an aspect of the present disclosure, CSI reporting can be appropriately implemented even in the case where a plurality of TRPs or panels are used.

Description

Terminal, wireless communication method, and base station

Technical Field

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

Background

In a Universal Mobile Telecommunications System (UMTS) network, long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3 GPP rel.10-14) is standardized for the purpose of further large capacity, advanced, and the like of LTE (Third Generation Partnership Project (3 GPP)) version (Release (rel.) 8, 9)).

Successor systems of LTE, such as also referred to as a fifth generation mobile communication system (5G), 5G + (plus), a sixth generation mobile communication system (6G), new Radio (NR), 3gpp rel.15 and so on, are also being studied.

Documents of the prior art

Non-patent document

Non-patent document 1:3GPP TS 36.300 V8.12.0' Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2 (Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In the NR, a User terminal (UE) measures a Channel State based on a resource of a Reference Signal such as a Channel State Information Reference Signal (CSI-RS), and feeds back (reports) Channel State Information (CSI) to a network (e.g., a base station).

In addition, in NR, it is being studied that one or more Transmission/Reception points (TRP) (multi TRP (M-TRP))) perform DL Transmission to a UE using one or more panels (multi panels). Further, studies are being made for: the UE UL transmits one or more TRPs using one or more panels.

However, in the NR specifications so far, control of CSI reporting in the case of using multi-panel/TRP has not been sufficiently studied. For example, TRP is not considered by the existing CSI priority. Therefore, if the existing CSI priority is used, CSI reporting cannot be appropriately performed in the case of multiple TRPs, and there is a possibility that throughput is lowered or communication quality is deteriorated.

Accordingly, it is an object of the present disclosure to provide a terminal, a wireless communication method, and a base station that can appropriately perform CSI reporting even in the case of using a plurality of TRPs or panels.

Means for solving the problems

A terminal according to an aspect of the present disclosure includes: a control unit deciding a priority related to Channel State Information (CSI) reporting based on a CSI report group index; and a transmission unit configured to transmit a CSI report selected based on the priority from among the plurality of conflicting CSI reports.

ADVANTAGEOUS EFFECTS OF INVENTION

According to an aspect of the present disclosure, CSI reporting can be appropriately implemented even in the case where a plurality of TRPs or panels are used.

Drawings

Fig. 1A to 1D are diagrams illustrating an example of determination of PUCCH resources for transmitting CSI reports in rel.15/16 NR.

Fig. 2 is a diagram showing an example of a multi-TRP scenario.

Fig. 3 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 4 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 5 is a diagram showing an example of the configuration of a user terminal according to an embodiment.

Fig. 6 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(CSI)

In the NR, the UE measures a Channel State based on a resource of a Reference Signal such as a Channel State Information Reference Signal (CSI-RS), and feeds back (reports) Channel State Information (CSI) to a network (e.g., a base station).

In addition, the CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS/PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI)), a Rank Indicator (RI)), an L1-RSRP (Reference Signal Received Power in Layer 1), an L1-RSRQ (Reference Signal Received Quality), an L1-SINR (Signal to Interference Noise Ratio), and the like.

As a feedback method of CSI, periodic CSI (P-CSI) report, aperiodic CSI (a-CSI) report, semi-Persistent CSI (SP-CSI) report, and the like are being studied.

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

In the present disclosure, the higher layer signaling may be any one of or a combination of Radio Resource Control (RRC) signaling, medium Access Control (MAC) signaling, broadcast information, and the like, for example.

MAC signaling may also use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), or the like. The broadcast Information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), minimum System Information (Remaining Minimum System Information (RMSI)), or Other System Information (OSI)).

The physical layer signaling may be, for example, downlink Control Information (DCI).

The CSI measurement setting information may be set using, for example, an RRC information element "CSI-MeasConfig". The CSI measurement setting information may include CSI resource setting information (RRC information element "CSI-ResourceConfig"), CSI report setting information (RRC information element "CSI-ReportConfig"), and the like. The CSI resource setting information is associated with resources used for CSI measurement, and the CSI report setting information is associated with matters of how the UE performs CSI reporting.

The CSI report configuration information ("CSI-ReportConfig") includes resource information for channel measurement ("resources for channel measurement"). The CSI report setting information may further include Interference measurement resource information (e.g., non-Zero Power (NZP) CSI-RS resource information ("NZP-CSI-RS-resource for Interference"), interference measurement CSI-Interference Management (IM) resource information ("CSI-IM-resource for Interference"), and the like). These pieces of resource information correspond to IDs (identifiers) of CSI resource setting information ("CSI-resourceconfigids").

The IDs of one or more pieces of CSI resource setting information (which may be referred to as CSI resource setting IDs) corresponding to the respective pieces of resource information may be the same value or different values.

The CSI resource setting information ("CSI-ResourceConfig") may also include a CSI resource setting information ID, CSI-RS resource set list information ("CSI-RS-ResourceSetList"), a resource type ("resourcettype"), and the like. The CSI-RS resource set list may also contain at least one of information of NZP CSI-RS and SSB for measurement ("NZP-CSI-RS-SSB") and CSI-IM resource set list information ("CSI-IM-ResourceSetList").

The resource type indicates the operation of the time domain set by the CSI-RS resource, and may be set to "aperiodic", "semi-persistent", or "periodic". The respectively corresponding CSI-RS may also be referred to as A-CSI-RS, SP-CSI-RS, P-CSI-RS.

The channel measurement resource may be used for calculation of CQI, PMI, L1-RSRP, and the like, for example. The interference measurement resource may be used for calculation of the L1-SINR, L1-SNR, L1-RSRQ, and other interference-related indicators.

(priority associated with CSI reporting)

In Rel.15In/16 NR, a CSI report (which may also be referred to as CSI report, CSI feedback, or the like) may also be associated with a priority value. For example, the value of the priority may also use the function Pri _iCSI (y, k, c, s) are defined. The priority may also be interchanged with CSI reporting priority, CSI priority, etc.

Here, y may be a value based on a type of CSI report (a-CSI report, SP-CSI report, or P-CSI report) and a Channel (Physical Uplink Shared Channel (PUSCH)) through which the CSI report is transmitted or an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))).

For example, y =0 in the case of an a-CSI report transmitted via the PUSCH, y =1 in the case of an SP-CSI report transmitted via the PUSCH, y =2 in the case of an SP-CSI report transmitted via the PUCCH, and y =3 in the case of a P-CSI report transmitted via the PUCCH.

k may be a value based on whether or not the CSI report includes L1-RSRP/SINR (for example, k =0 in the case where the CSI report includes L1-RSRP/SINR, and k =1 in the case where the CSI report does not include L1-RSRP/SINR). c may also be the serving cell index. s may be a report configuration ID (reportConfigID).

For example, pri _iCSI (y, k, c, s) can also be obtained by the following formula 1.

(formula 1)

Pri _iCSI (y、k、c、s)＝2·N _cells ·M _s ·y+N _cells ·M _s ·k+M _s ·c+s

Here, N may be _cells Is the value of the maximum number of cells to be set (higher layer parameter maxNrofServingCells), M _s Is a value of the maximum number of CSI report settings (higher layer parameters maxNrofCSI-reporting configurations) that are set.

At Pri associated with the first CSI report _iCSI The value of (y, k, c, s) is less than Pri associated with the second CSI report _iCSI The value of (y, k, c, s) may also mean that the first CSI report has a higher priority than the second CSI report.

(conflict of CSI reports)

In rel.15/16NR, when time occupancy (time occupancy) of a physical channel (e.g., PUCCH, PUSCH) scheduled for transmission of two CSI reports is overlapped in at least one Orthogonal Frequency Division Multiplexing (OFDM) symbol and transmitted in the same carrier, the two CSI reports collide (collision).

In the case where the UE is set to transmit two conflicting CSI reports, and the value of y (in the formula of priority) is different between the two CSI reports, the following rule applies except for the case where the value of y is 2 for one and 3 for the other: CSI reports with higher priority values are not sent by the UE. In cases where this is not the case, the two CSI reports may either be multiplexed or one dropped based on the value of the priority.

In the case where a plurality of PUCCH resources are set in 1 slot for transmitting a CSI report and a list of PUCCH resources for a plurality of CSIs (RRC parameter "multi-CSI-PUCCH-resource list") is not provided or the plurality of PUCCH resources do not overlap in the 1 slot, the UE determines a first resource corresponding to a CSI report having the highest priority.

Here, when the first resource includes PUCCH format 2 and there are remaining resources that do not overlap with the first resource in the 1 slot, the UE determines a CSI report having the highest priority from among CSI reports having corresponding resources among the remaining resources, and determines a corresponding second resource as an additional resource for CSI reporting.

Further, when the first resource includes PUCCH format 3 or PUCCH format 4 and there is a remaining resource that does not overlap with the first resource and includes PUCCH format 2 in the 1 slot, the UE determines a CSI report having the highest priority from among CSI reports having corresponding resources among the remaining resources, and determines a corresponding second resource as an additional resource for CSI reporting.

When a plurality of PUCCH resources are set in 1 slot for transmitting CSI reports and a list of PUCCH resources for a plurality of CSI is provided and the plurality of PUCCH resources overlap in the 1 slot, the UE multiplexes all CSI reports in one resource from the resources provided through the list.

In rel.15/16NR, PF (PUCCH format) includes PF0 to PF 4, but at least one of PF2, PF3, and PF 4 used for Uplink Control Information (UCI) having more than 2 bits is used for CSI reporting. PF2 is transmitted over 1 or 2 symbols, and PF3/4 is transmitted over 4 or more symbols.

Fig. 1A to 1D are diagrams illustrating an example of determination of PUCCH resources for transmitting CSI reports in rel.15/16 NR. In this example, a description will be given of a situation where a UE is set with 4 PUCCH resources in 1 slot (14 symbols). The priorities (highest, second highest, third highest, fourth highest) of predetermined CSI reports transmitted through the respective PUCCH resources are shown.

Fig. 1A and 1B show examples in which the UE does not provide a list of PUCCH resources for a plurality of CSI (and a part of the 4 PUCCH resources overlap). Fig. 1C and 1D show examples in which the 4 PUCCH resources do not overlap (in this example, arbitrary PUCCH resource groups do not overlap).

The UE decides a CSI report having the highest priority and decides a PUCCH resource corresponding to the CSI report as a first resource. In fig. 1A and 1C, the PUCCH resource of PF2 is determined as the first resource, and in fig. 1B and 1D, the PUCCH resource of PF3/4 is determined as the first resource.

In the example of fig. 1A, the UE decides a PUCCH resource corresponding to a CSI report having the highest priority (of the third priority of the whole) among CSI reports of resources that do not overlap with the first resource as the second resource.

In the example of fig. 1B, the UE determines, as the second resource, a PUCCH resource corresponding to a CSI report having the highest priority (fourth priority of the entire) among CSI reports of resources that do not overlap with the first resource and include PF 2.

In the example of fig. 1C, the UE decides a PUCCH resource corresponding to a CSI report having the highest priority (second priority of the whole) among CSI reports of resources that do not overlap with the first resource as the second resource.

In the example of fig. 1D, the UE decides, as the second resource, a PUCCH resource corresponding to a CSI report having the highest priority (fourth priority of the entire) among CSI reports of resources that do not overlap with the first resource and include PF 2.

The UE may also report the CSI report using one or both of the decided first resource and second resource.

(multiple TRP)

In NR, studies are underway: one or more Transmission/Reception points (TRPs) (multi TRPs (M-TRPs))) perform DL Transmission to the UE using one or more panels (multi panels). Further, studies are being made for: the UE UL transmits the one or more TRPs using the one or more panels.

The plurality of TRPs may correspond to the same cell Identifier (ID)) or may correspond to different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

Fig. 2 is a diagram showing an example of a multi-TRP scenario. In these examples, it is envisaged that each TRP and UE can utilize two different beams, but is not limited thereto.

Multiple TRPs (TRP #1, # 2) may also be connected through an ideal/non-ideal backhaul (backhaul) and exchanged information, data, etc. Different codewords (Code Word (CW)) and different layers may be transmitted from each TRP of the multiple TRPs. As a form of multi-TRP Transmission, non-Coherent Joint Transmission (NCJT) may be used.

In NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword, and transmits a first PDSCH using first precoding on a first number of layers (for example, 2 layers). TRP2 also modulation maps the second codeword and performs layer mapping, and transmits the second PDSCH using a second precoding for a second number of layers (e.g., 2 layers).

In addition, the multiple PDSCHs (multiple PDSCHs) by NCJT may 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 time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may also overlap.

It is also contemplated that the first and second PDSCHs are not in a Quasi-Co-Location (QCL) relationship (non-Quasi-Co-located). The reception of multiple PDSCHs may also be replaced with simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

The UE receives multiple PDSCHs (which may also be referred to as multiple PDSCHs) from multiple TRPs based on one or more DCIs. In addition, in this example, the UE assumes: different CSI reports (CSI reports) related to the respective TRPs are transmitted for the different TRPs. Such CSI feedback may also be referred to as separate feedback, separate CSI feedback, or the like. In addition, CSI feedback for transmitting a CSI report related to TRPs of both TRPs to one TRP may also be referred to as joint feedback, joint CSI feedback, or the like.

In fig. 2, the UE is set to: for TRP #1, a CSI report for TRP #1 is transmitted using a certain PUCCH (PUCCH 1), and for TRP #2, a CSI report for TRP #2 is transmitted using another PUCCH (PUCCH 2).

According to such a multi-TRP scenario, more flexible transmission control using a channel with good quality can be performed.

However, in the NR specifications so far, control of CSI reporting in the case where multi-panel/TRP is utilized has not been sufficiently studied. For example, the existing CSI priority of equation 1 is without considering TRP. Therefore, if the existing CSI priority is used, CSI reporting cannot be appropriately performed in the case of multiple TRPs, and there is a possibility that throughput is lowered or communication quality is deteriorated.

Accordingly, the inventors of the present invention have conceived a method for appropriately performing CSI reporting. According to an aspect of the present disclosure, a UE can appropriately determine a CSI priority in association with a TRP.

In the present disclosure, "a/B" may mean "at least one of a and B".

In the present disclosure, a panel, an Uplink (UL) transmitting entity, a TRP, a spatial relationship, a COntrol REsource SET (CORESET), a PDSCH, a codeword, a base station, a specific antenna port (e.g., a DeModulation Reference Signal (DMRS)) port), a specific antenna port group (e.g., a DMRS port group), a specific group (e.g., a Code Division Multiplexing (CDM)) group, a specific Reference Signal group, a CORESET pool, and the like may be substituted for each other. In addition, a TRP Identifier (ID)) may also be interchanged with TRP.

In the present disclosure, indexes, IDs, indicators, resource IDs, etc. may also be substituted for one another. In the present disclosure, beams, TCI status, DL TCI status, UL TCI status, unified TCI status, QCL assumption, spatial relationship information, precoder, etc. may also be substituted for each other.

Lists, groups, sets, subsets, clusters (clusters), etc. may also be substituted for one another in this disclosure.

(Wireless communication method)

An embodiment of the present disclosure relates to CSI priority. The CSI priority described below may be used when the UE is set to multiple TRPs, or may be used when the CSI feedback (for multiple TRPs) uses separate feedback.

In the case of multiple TRPs, the CSI priority may be determined by the above equation 1 or at least one of equations 2 to 6 for CSI reporting associated with different TRPs. When the CSI reports corresponding to a plurality of TRPs collide with each other, the UE may control transmission of the CSI reports (or PUCCH resources for transmitting the CSI reports) based on the priority corresponding to each CSI report.

(formula 2)

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

(formula 3)

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

(formula 4)

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

(formula 5)

Pri _iCSI (y、p、k、c、s)＝2·N _cells ·M _s ·K _p ·y+2·N _cells ·M _s ·p+N _cells ·M _s ·k+M _s ·c+s

(formula 6)

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

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

The CSI report group index may also be set by at least one of a higher layer parameter (e.g., reportConfigGroupId) representing a CSI report group Index (ID), a higher layer parameter (e.g., coresetpoindindex) representing a CORESET pool index, and the like.

The CSI report group index may be set to include at least one of CSI report setting information ("CSI-report Configuration"), 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 state (Transmission Configuration Indication state), QCL information ("QCL-Info"), and the like, which are RRC information elements.

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

The CSI report group index may also be replaced with a CSI group index, a value associated with the CSI report group, a CORESET pool index, and the like.

In each equation, a case where a CSI report having a relatively small p is preferentially transmitted compared to a CSI report having a relatively large p is shown, but the present invention is not limited thereto. Equations 2 to 6 may be modified so as to give priority to CSI reports with a large p. In addition, the constants (e.g., "8" in equation 6), parameters, and the like in the respective equations may be replaced with other values, other parameters, and the like. Further, as the CSI priority, the following values may also be used: the values derived by equations 1 to 6 are subjected to addition, subtraction, multiplication, and division with arbitrary values/parameters.

In each formula, the parameters described in formula 1 may be the same as those in formula 1. For example, y may be a value determined by the CSI report type, and k may be a value determined by the content transmitted by the CSI report (CSI report content). In the present disclosure, the "CSI report type" may be replaced with "y". In addition, in the present disclosure, "CSI report content" may be interchanged with "k".

In the case of using equation 1, the report configuration ID (reportConfigID) (in other words, s in equation 1) may correspond to a plurality of TRPs. In this case, the CSI priority values of multiple CSI reports associated with different TRPs may also be the same.

In the case of using equation 1, the report configuration ID (in other words, s in equation 1) may correspond to one TRP (or TRP index). In this case, the value of CSI priority may also represent the priority of TRP.

In the case of using equation 1, the report configuration ID (in other words, s in equation 1) may correspond to one TRP having a specific Interference Measurement Resource (IMR) setting. In this case, the value of CSI priority may also represent the priority of TRP with IMR hypothesis (hypothesiis).

With regard to expressions 2 to 6, p may also be a specific value (e.g., default value, p = 0) for CSI reports for which no CSI report group index is set.

K _p The maximum number of set CSI report groups (which may also be referred to as report setting groups) may be set (higher layer parameters maxnroffreportconfiggroups). In addition, K _p It may also be the number of TRPs set or the maximum number.

With respect to equations 2 to 5, K is for CSI reports for which no CSI group index is set _p Or may be a specific value (e.g., default value, K) _p ＝1)。

In equation 2, for CSI reports having the same CSI report type, CSI report content, serving cell index, and report setting ID, CSI reports having a smaller p are prioritized.

In equation 3, for CSI reports having the same CSI report type, CSI report content, and serving cell index, CSI reports having a smaller p are prioritized.

In equation 4, the coefficient of the parameter y (here, 2 · N) corresponding to the CSI report type _cells ·M _s ·K _p ) Coefficient greater than parameter p associated with the CSI report set (here, N) _cells ·M _s ). In other words, in equation 4, the value of the priority is determined more depending on the CSI report type than the CSI report set. In other words, in equation 4, a change in the value of the priority due to the change of the value (y) determined by the CSI report type by 1 is larger than a change in the value of the priority due to the change of the CSI report group index (p) by 1. In equation 4, CSI reports having the same CSI report type and CSI report content are prioritized with smaller p.

In equation 5, the coefficient of the parameter y (here, 2 · N) corresponding to the CSI report type _cells ·M _s ·K _p ) A coefficient greater than the parameter p associated with the CSI report set (here, 2N) _cells ·M _s ). In other words, in equation 5, the value of the priority is determined more depending on the CSI report type than the CSI report set.

In equation 6, the coefficient (here, 8) of the parameter (e.g., p) associated with the CSI report set·N _cells ·M _s ) A coefficient (here, 2 · N) larger than the parameter y corresponding to the CSI report type _cells ·M _s ). In other words, in equation 6, the priority value is determined depending on the CSI report group more than the CSI report type.

According to one embodiment described above, the CSI report reported in association with the TRP can be determined by the CSI priority. Thus, even in the case of communication using multiple TRPs, the UE can perform appropriate CSI reporting on the TRPs.

(Wireless communication System)

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

Fig. 3 is a diagram showing an example of a schematic configuration of a radio 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 (3 GPP), new wireless (5 th Generation mobile communication system New Radio (5G NR)) of the fifth Generation mobile communication system, or the like.

In addition, the wireless communication system 1 may also support Dual Connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs)). The MR-DC may include LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), NR and LTE Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station of NR (gNB) is MN and the base station of LTE (E-UTRA) (eNB) is SN.

The wireless communication system 1 may also support Dual connection between a plurality of base stations within the same RAT (for example, dual connection of a base station (gNB) in which both MN and SN are NR (NR-NR Dual Connectivity (NN-DC)))).

The wireless communication system 1 may include: a base station 11 forming a macrocell C1 having a relatively wide coverage area, and base stations 12 (12 a to 12C) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the embodiments shown in the figures. Hereinafter, base stations 11 and 12 will be collectively referred to as base station 10 without distinguishing them.

The user terminal 20 may also 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) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

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

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).

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based Common Public Radio Interface (CPRI)), X2 Interface, or the like) or wirelessly (e.g., NR communication). For example, when NR communication is used as a Backhaul between base stations 11 and 12, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) donor (donor) and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

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 include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5 GCN)), a Next Generation Core (NGC), and the like.

The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). 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), or the like may be used.

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

In the radio communication system 1, as the Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH))), a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))) and the like that are Shared by the user terminals 20 may be used.

In addition, in the radio communication system 1, as the Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH)), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH)), a Random Access Channel (Physical Random Access Channel (PRACH)), or the like Shared by each user terminal 20 may be used.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted over the PUSCH. In addition, a Master Information Block (MIB)) may also be transmitted through PBCH.

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

The DCI scheduling PDSCH may be referred to as DL assignment, DL DCI, or the like, and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be used. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). A CORESET may also be associated with one or more search spaces. The UE may also monitor the CORESET associated with a certain search space based on the search space settings.

One search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation levels). The one or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be replaced with each other.

Uplink Control Information (UCI)) including at least one of Channel State Information (CSI), ACKnowledgement Information (for example, may also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, and Scheduling ReQuest (SR)) may also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell may also be transmitted through the PRACH.

In addition, in the present disclosure, a downlink, an uplink, and the like may also be expressed without "link". Further, it can be said that "Physical (Physical)" is not attached to the head of each channel.

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, the DL-RS may be 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), or the like.

The Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. The signal blocks including the SSs (PSS, SSs) and the PBCH (and the DMRS for PBCH) may be referred to as SS/PBCH blocks, SS blocks (SSB), and the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

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

(base station)

Fig. 4 is a diagram illustrating an example of a configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission line interface (transmission line interface) 140. The control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission line interface 140 may be provided in one or more numbers.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, but it is also conceivable that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control the generation of signals, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception, measurement, and the like using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmission/reception section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

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

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission/reception unit 120 may receive the uplink channel, the uplink reference signal, and the like.

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, with respect to Data, control information, and the like acquired from Control section 110, transmission/reception section 120 (transmission processing section 1211) may perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like, and generate a bit string to be transmitted.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, discrete Fourier Transform (DFT) processing (if necessary), inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

The transmission/reception section 120 (RF section 122) may perform modulation, filter processing, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 130.

On the other hand, the transmission/reception unit 120 (RF unit 122) may amplify, filter, demodulate a signal in a radio frequency band received through the transmission/reception antenna 130 to a baseband signal.

Transmission/reception section 120 (reception processing section 1212) may acquire user data and the like by applying, to the acquired baseband signal, reception processing such as analog-to-digital conversion, fast Fourier Transform (FFT) processing, inverse Discrete Fourier Transform (IDFT) processing (as necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing.

The transmission/reception unit 120 (measurement unit 123) may also perform measurement related to the received signal. For example, measurement section 123 may perform Radio Resource Management (RRM) measurement, channel State Information (CSI) measurement, and the like based on the received signal. Measurement section 123 may perform measurement of 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), and the like. The measurement result may also be output to the control unit 110.

The transmission path interface 140 may transmit and receive signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, or may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, and the like.

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

Further, transmission/reception section 120 may transmit, to user terminal 20, CSI report group indexes as follows: the CSI report group index used in the user terminal 20 to decide the priority related to the Channel State Information (CSI) report.

Furthermore, transmit/receive section 120 may also receive CSI reports as follows: the user terminal 20 selects and transmits a CSI report based on the priority from the plurality of conflicting CSI reports.

(user terminal)

Fig. 5 is a diagram showing an example of the 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. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with one or more antennas.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, but it is also conceivable that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 210 may also control the generation, mapping, etc. of the signals. Control section 210 may control transmission/reception, measurement, and the like using transmission/reception section 220 and transmission/reception antenna 230. Control section 210 may generate data, control information, a sequence, and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmission/reception section 220.

The transmitting/receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmission/reception section 220 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission section may be constituted by the transmission processing section 2211 and the RF section 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting/receiving antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 220 may receive the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmission/reception unit 220 may transmit the uplink channel, the uplink reference signal, and the like described above.

Transmit/receive section 220 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, with respect to data and control information acquired from control section 210, transmission/reception section 220 (transmission processing section 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), and the like, and generate a bit sequence to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (including error correction coding as well), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

Whether or not DFT processing is applied may be set based on transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is active (enabled), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, or when not, transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing without performing DFT processing.

The transmission/reception section 220 (RF section 222) may perform modulation, filter processing, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 230.

On the other hand, the transmission/reception section 220 (RF section 222) may perform amplification, filter processing, demodulation to a baseband signal, and the like on a signal in a radio frequency band received by the transmission/reception antenna 230.

Transmission/reception section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (including error correction decoding, as well as) MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data and the like.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 210.

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

In addition, control unit 210 may also decide a priority related to Channel State Information (CSI) reporting based on the CSI report group index.

Transmission/reception section 220 may transmit a CSI report selected based on the priority from among a plurality of conflicting CSI reports.

Control section 210 may determine the priority so that a CSI report having a smaller CSI report group index is prioritized for CSI reports having the same CSI report type, CSI report content, serving cell index, and report configuration ID.

Control section 210 may determine the priority so that a CSI report having a smaller CSI report group index is prioritized for CSI reports having the same CSI report type, CSI report content, and report setting ID.

Control section 210 may determine the priority by assuming that a change in the value of the priority due to a change of the value determined by the CSI report type by 1 is larger than a change in the value of the priority due to a change of the CSI report group index by 1.

(hardware construction)

The block diagram used in the description of the above embodiment shows blocks in functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one apparatus physically or logically combined, or may be implemented by a plurality of apparatuses by directly or indirectly (for example, by wire, wireless, or the like) connecting two or more apparatuses physically or logically separated. The functional blocks may also be implemented by combining one or more of the above-described devices with software.

Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), and assignment (ordering). For example, a function block (a configuration unit) that realizes a transmission function may also be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the method of realizing any of the above methods is not particularly limited.

For example, the base station, the user terminal, and the like 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. Fig. 6 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the 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, and the like.

In addition, in the present disclosure, terms such as apparatus, circuit, device, section (section), unit, and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the respective devices shown in the drawings, or may not include some of the devices.

For example, only one processor 1001 is illustrated, but there may be multiple processors. The processing may be executed by one processor, or may be executed by two or more processors simultaneously, sequentially, or by another method. Further, the processor 1001 may be implemented by one or more chips.

Each function of the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, and performing calculation by the processor 1001 to control communication via the communication device 1004 or to control at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmission/reception unit 120 (220), and the like may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be similarly realized for other functional blocks.

The Memory 1002 may be a computer-readable recording medium, and may be formed 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 suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), etc. The memory 1002 can store a program (program code), a software module, and the like that are executable to implement the wireless communication method according to one embodiment of the present disclosure.

The storage 1003 may be a computer-readable recording medium, and may be configured by at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an optical disk (e.g., a Compact Disc read only memory (CD-ROM)) or the like), a digital versatile Disc (dvd), a Blu-ray (registered trademark) disk), a removable disk (removable Disc), a hard disk drive, a smart card (smart card), a flash memory device (e.g., a card (card), a stick (stick), a key drive), a magnetic stripe (stripe), a database, a server, or other suitable storage media. The storage 1003 may also be referred to as a secondary storage device.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example. Communication apparatus 1004 may be configured to include a high Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD), for example. For example, the above-described transmission/reception section 120 (220), transmission/reception antenna 130 (230), and the like may be implemented by the communication device 1004. The transmitting unit 120 (220) and the receiving unit 120b (220 b) may be physically or logically separated from each other.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be configured by a single bus, or may be configured by different buses among the respective devices.

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), a Field Programmable Gate Array (FPGA), or the like, and a part or all of the functional blocks may be implemented using the hardware. For example, the processor 1001 may also be implemented with at least one of these hardware.

(modification example)

In addition, terms described in the present disclosure and terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS for short, and may also be referred to as Pilot (Pilot), pilot Signal, etc. depending on the applied standard. Further, component Carriers (CCs) may also be referred to as cells, frequency carriers, carrier frequencies, and the like.

A radio frame may also be made up of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1 ms) independent of a parameter set (numerology).

Here, the parameter set may also refer to a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the parameter set may further indicate at least one of SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission Time Interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the Time domain, and the like.

The time slot may be formed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and the like) in the time domain. Further, the time slot may also be a time unit based on a parameter set.

A slot may also contain multiple mini-slots. Each mini-slot may also be made up 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 made up of a fewer number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may also be referred to as PDSCH (PUSCH) mapping type a. The PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may also use other names corresponding to each. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be replaced with each other.

For example, one subframe may also be referred to as TTI, a plurality of consecutive subframes may also be referred to as TTI, and one slot or one mini-slot may also be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (such as a frequency bandwidth and transmission power usable by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (for example, the number of symbols) to which transport blocks, code blocks, codewords, and the like are actually mapped may also be shorter than the TTI.

In addition, when one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. The number of slots (the number of mini-slots) constituting the minimum time unit of the schedule may be controlled.

A TTI having a time length of 1ms 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 slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI), may be replaced with a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include one or more continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, and the like may be formed of one or more resource blocks.

In addition, one or more RBs may also be referred to as a Physical Resource Block (PRB), a subcarrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, and the like.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

The Bandwidth Part (BWP) (which may be referred to as a partial Bandwidth) may also indicate a subset of consecutive common RBs (common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may also be defined in a certain BWP and are numbered additionally within the BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). For the UE, one or more BWPs may also be set within one carrier.

At least one of the configured BWPs may be active, and the UE may not expect to transmit and receive a specific channel/signal other than the active BWPs. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced with "BWP".

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the configuration such as the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, cyclic Prefix (CP) length in a TTI can be variously changed.

The information, parameters, and the like described in the present disclosure may be expressed as absolute values, relative values to specific values, or other corresponding information. For example, the radio resource may also be indicated by a specific index.

In the present disclosure, the names used for the parameters and the like are not limitative names in all aspects. Further, the mathematical expressions and the like 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 thus, the various names assigned to these various channels and information elements are not limitative names in all aspects.

Information, signals, and the like 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, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, information, signals, and the like can be output in at least one direction of: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, and the like may also be input and output via a plurality of network nodes.

The input/output information, signals, and the like may be stored in a specific location (for example, a memory) or may be managed using a management table. The input/output information, signals, and the like may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The information notification is not limited to the embodiment and embodiment described in the present disclosure, and may be performed by other methods. For example, the Information notification in the present disclosure may be implemented by physical layer signaling (e.g., downlink Control Information (DCI)), uplink Control Information (UCI)), higher layer signaling (e.g., radio Resource Control (RRC)) signaling, broadcast Information (Master Information Block (MIB)), system Information Block (SIB)), or the like), medium Access Control (MAC) signaling), other signals, or a combination thereof.

The physical Layer signaling may also be referred to as Layer 1/Layer 2 (L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like. The RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC Connection Setup (RRC Connection Setup) message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message, or the like. Further, the MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to an explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of other information).

The decision may be made by a value (0 or 1) represented by one bit, by a true-false value (boolean value) represented by true (true) or false (false), or by a comparison of values (for example, a comparison with a specific value).

Software, whether referred to as software (software), firmware (firmware), middleware-ware (middle-ware), microcode (micro-code), hardware description language, or by other names, should be broadly construed to mean instructions, instruction sets, code (code), code segments (code segments), program code (program code), programs (program), subroutines (sub-program), software modules (software module), applications (application), software applications (software application), software packages (software packages), routines (routines), subroutines (sub-routines), objects (objects), executable files, threads of execution, processes, functions, or the like.

Software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, where the software is transmitted from a website, server, or other remote source (remote source) using at least one of wired techniques (coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), etc.) and wireless techniques (infrared, microwave, etc.), at least one of these wired and wireless techniques is included within the definition of transmission medium.

The terms "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding (precoding)", "precoder (precoder)", "weight (precoding weight)", "Quasi-Co-Location (QCL))", "Transmission Configuration Indication state (TCI state)", "spatial relationship (spatial relationship)", "spatial filter (spatial domain filter)", "Transmission power", "phase rotation", "antenna port group", "layer", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel" can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "eNB (eNodeB)", "gNB (gtnodeb)", "access Point (access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where a base station is referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

The base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also provide a communication service through a base station subsystem (e.g., an indoor small base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of the base stations and base station subsystems that is in communication service within the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE))", "terminal" and the like can be used interchangeably.

There are also instances when a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or several other suitable terms.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, and the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, a mobile body main body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), may be a mobile body that moves in an unmanned manner (e.g., a drone (a drone), an autonomous vehicle, etc.), or may be a robot (manned or unmanned). At least one of the base station and the mobile station 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 be an Internet of Things (IoT) device such as a sensor.

In addition, the base station in the present disclosure may also be replaced with a user terminal. For example, the various aspects/embodiments of the present disclosure may also be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (e.g., which may also be referred to as Device-to-Device (D2D)), vehicle-to-Vehicle networking (V2X), etc.). In this case, the user terminal 20 may have the functions of the base station 10 described above. Also, terms such as "upstream" and "downstream" may be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

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

In the present disclosure, operations performed by the base station are assumed to be performed by an upper node (upper node) depending on the case. Obviously, in a network including one or more network nodes (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 (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited thereto), or a combination thereof.

The aspects and embodiments described in the present disclosure may be used alone, or in combination, or may be used in combination with execution. Note that, in the embodiments and the embodiments described in the present disclosure, the order of the processes, sequences, flowcharts, and the like may be changed as long as they are not contradictory. For example, elements of various steps are presented in the order illustrated for the method described in the present disclosure, but the method is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, fourth generation mobile communication system (4G)), fifth generation mobile communication system (5G), sixth generation mobile communication system (6G)), x generation mobile communication system (xG) (xG (x is, for example, an integer, a decimal)), future Radio Access (Future Access (FRA)), new Radio Access Technology (New-Radio Access (RAT (NR)), new radio access (NX)), new generation radio access (FX), global System for Mobile communications (GSM (registered trademark)), CDMA2000, 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), a System using another appropriate wireless communication method, a next generation System extended based on these, and the like. Furthermore, multiple systems may also be applied in combination (e.g., LTE or LTE-a, combination with 5G, etc.).

The term "based on" used in the present disclosure does not mean "based only" unless otherwise specified. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to elements using the designations "first," "second," etc. used in this disclosure does not fully define the amount or order of such elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be used or that the first element must be in some form of preference to the second element.

The term "determining" used in the present disclosure may include various operations. For example, "determination (decision)" may be regarded as a case where "determination (decision)" is performed on determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search, inquiry (query)) (for example, search in a table, a database, or another data structure), confirmation (authenticating), and the like.

The term "determination (decision)" may be used to mean "determination (decision)" of reception (e.g., reception of information), transmission (e.g., transmission of information), input (input), output (output), access (access) (e.g., access to data in a memory), and the like.

The "determination (decision)" may be regarded as a case where the "determination (decision)" is performed for solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like. That is, "judgment (decision)" may also be regarded as a case where "judgment (decision)" is made for some action.

The "judgment (determination)" may be replaced with "assumption (associating)", "expectation (expecting)", "consideration (associating)", or the like.

The terms "connected" and "coupled" or any variation thereof used in the present disclosure mean all connections or couplings between two or more elements directly or indirectly, and can include a case where one or more intermediate elements exist between two elements "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "access".

In the present disclosure, where two elements are connected, it can be considered to be "connected" or "joined" to each other using more than one wire, cable, printed electrical connection, etc., and using electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, the optical (both visible and invisible) region, etc., as a few non-limiting and non-limiting examples.

In the present disclosure, the term "a is different from B" may 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", "combined", and the like are also to be construed as the same as "different".

In the present disclosure, when the terms "including", and "variation thereof are used, these terms are intended to have inclusive meanings as in the term" comprising ". Further, the term "or" used in the present disclosure does not mean exclusive or.

In the present disclosure, for example, in the case where articles are added by translation as in a, an, and the in english, the present disclosure may also include the case where nouns following these articles are plural.

Although the invention according to the present disclosure has been described in detail above, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not have any limiting meaning to the invention to which the present disclosure relates.

Claims (6)

1. A terminal, having:

a control unit deciding a priority related to Channel State Information (CSI) reporting based on a CSI report group index; and

and a transmission unit configured to transmit a CSI report selected based on the priority from among the plurality of conflicting CSI reports.

2. The terminal of claim 1, wherein,

the control unit determines the priority so that a CSI report having a smaller CSI report group index is prioritized for a CSI report having the same CSI report type, CSI report content, serving cell index, and report setting ID.

3. The terminal of claim 1, wherein,

the control unit determines the priority so that a CSI report having a smaller CSI report group index is prioritized for a CSI report having the same CSI report type, CSI report content, and report setting ID.

4. The terminal of claim 1, wherein,

the control unit assumes that a change in a value of the priority due to a change in the value determined by the CSI reporting category by 1 is larger than a change in a value of the priority due to a change in the CSI reporting group index by 1, and determines the priority.

5. A wireless communication method of a terminal, comprising:

a step of deciding a priority related to a Channel State Information (CSI) report based on a CSI report group index; and

and transmitting a CSI report selected based on the priority from among the plurality of conflicting CSI reports.

6. A base station having:

a transmitting unit, configured to transmit the following CSI report group index to the terminal: a Channel State Information (CSI) report group index used in the terminal to decide a priority related to a CSI report; and

a receiving unit for receiving the following CSI reports: a CSI report selected and transmitted by the terminal from the conflicting plurality of CSI reports based on the priority.

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