JPWO2020065882A1 - User terminal and wireless communication method - Google Patents

Abstract

The user terminal has a control unit that generates one channel state information of phase and amplitude for a subband for which channel state information reporting is set, and a transmission unit that reports the channel state information. According to one aspect of the present disclosure, CSI reporting can be made appropriately.

Description

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

In the UMTS (Universal Mobile Telecommunications System) network, LTE (Long Term Evolution) has been specified for the purpose of further high-speed data rate and low delay (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (3GPP (Third Generation Partnership Project) Rel. (Release) 8, 9).

A successor system to LTE (for example, 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), 3GPP Rel.15 or later, etc.) is also being studied.

In an existing LTE system (for example, LTE Rel. 8-13), a user terminal (UE: User Equipment) periodically and / or aperiodically refers to a base station with Channel State Information (CSI). ) Is sent. The UE transmits the CSI using the uplink control channel (PUCCH: Physical Uplink Control Channel) and / or the uplink shared channel (PUSCH: Physical Uplink Shared Channel).

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

In future wireless communication systems (for example, NR), CSI for performing communication using multi-beam is being studied.

However, such CSI has a large overhead. Reducing the overhead can reduce the accuracy of the CSI. Therefore, if an appropriate CSI is not reported, system performance may be degraded.

Therefore, one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method capable of appropriately performing CSI reporting.

The user terminal according to one aspect of the present disclosure includes a control unit that generates one channel state information of phase and amplitude for a subband for which channel state information reporting is set, and a transmission unit that reports the channel state information. It is characterized by having.

According to one aspect of the present disclosure, CSI reporting can be made appropriately.

FIG. 1 is a diagram showing an example of subband CSI. FIG. 2 is a diagram showing an example of a priority reporting level table. FIG. 3 is a diagram showing an example of a subband group. FIG. 4 is a diagram showing a first example of the priority reporting level table. FIG. 5 is a diagram showing a second example of the priority reporting level table. FIG. 6 is a diagram showing a third example of the priority reporting level table. FIG. 7 is a diagram showing a fourth example of the priority reporting level table. FIG. 8 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 9 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 10 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 11 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

In the NR, the UE measures the channel state using a predetermined reference signal (or resource for the reference signal). The reference signal for measuring the channel state may be called CSI-RS (Channel State Information-Reference Signal) or the like. The UE measures the channel state using a signal other than CSI-RS (for example, a synchronization signal / broadcast channel (SS / PBCH: Synchronization Signal / Physical Broadcast Channel) block, a synchronization signal, a reference signal for demodulation, etc.). You may.

The CSI-RS resource may include at least one of Non Zero Power (NZP) CSI-RS and CSI-IM (Interference Management). Further, the SS / PBCH block is a block including a primary synchronization signal (PSS: Primary Synchronization Signal), a secondary synchronization signal (SSS: Secondary Synchronization Signal) and PBCH, and may be called an SS block or the like.

The UE transmits channel state information (CSI) to a base station (for example, BS (Base Station), transmission / reception point (TRP: Transmission / Reception Point)), eNB (eNodeB) at a predetermined timing based on a measurement result such as a reference signal. ), GNB (NR NodeB), etc.).

The CSI is a channel quality identifier (CQI: Channel Quality Indicator), a precoding matrix identifier (PMI: Precoding Matrix Indicator), a CSI-RS resource identifier (CRI: CSI-RS Resource Indicator), and an SS / PBCH block resource identifier (CRI: CSI-RS Resource Indicator). At least SSBRI: SS / PBCH Block Indicator), layer identifier (LI: Layer Indicator), rank identifier (RI: Rank Indicator), L1-RSRP (Layer 1 Reference Signal Received Power), etc. One may be included.

The CSI may have multiple parts. The first part of the CSI (Part 1 CSI) may include fixed payload size information (eg, RI, CQI, etc.). The second part of the CSI (Part 2 CSI) may contain different types of information (eg, PMI, etc.) than the Part 1 CSI.

CSI feedback methods include (1) periodic CSI (P-CSI: Periodic CSI) reporting, (2) aperiodic CSI (A-CSI: Aperiodic CSI) reporting, and (3) semi-permanent (semi-permanent) reporting. Sustained, semi-persistent (Semi-Persistent) CSI reports (SP-CSI: Semi-Persistent CSI) reports are being studied.

The UE provides information about the reporting resource of at least one CSI of P-CSI, SP-CSI and A-CSI (which may be referred to as CSI reporting setting) to higher layer signaling, physical layer signaling (eg, downlink). It may be notified using control information (DCI: Downlink Control Information) or a combination thereof.

Here, the upper layer signaling may be, for example, any one of RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.

For MAC signaling, for example, a MAC control element (MAC CE (Control Element)), a MAC PDU (Protocol Data Unit), or the like may be used. Broadcast information includes, for example, a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), a minimum system information (RMSI: Remaining Minimum System Information), and other system information (OSI: Other). System Information) and so on.

The CSI-ReportConfig may include, for example, information about reporting cycles, offsets, etc., which may be expressed in predetermined time units (slot units, subframe units, symbol units, etc.). The CSI report setting may include a setting ID (CSI-ReportConfigId), and the setting ID may specify parameters such as the type of CSI reporting method (whether SP-CSI or not, etc.) and the reporting cycle. The CSI reporting setting may include information (CSI-ResourceConfigId) indicating which reference signal (or resource for which reference signal) is used to report the measured CSI.

The plurality of CSI types may be set according to the intended use (or communication function). For example, a CSI type (also called type I) CSI set for communication using a single beam and a CSI type (type 2 (type I) type) set for communication using a multi-beam. II) Also called CSI). Of course, the usage of the CSI type is not limited to this.

UEs and base stations may utilize Type 1 CSI to maintain a coarse link utilizing a single beam. Further, the UE and the base station may use the type 2 CSI to make a connection using a multi-beam (for example, a plurality of layers). For example, the type 2 CSI may be configured to include information for each layer (or beam-related information such as a beam number).

Further, it may be controlled to report only a part of the CSI parameters of the type 2 CSI information type (CSI parameters). A CSI containing some information types may be referred to as a partial type 2 CSI.

When the UE transmits Type 1 CSI using the uplink control channel, for example, RI and / or CRI (CSI-RS resource indicator), PMI, and CQI are reported as CSI parameters. The PMI may include a wide band PMI 1 having a long feedback period and a sub band PMI 2 having a short feedback period. The PMI1 is used for selecting the vector W1, the PMI2 is used for selecting the vector W2, and the precoder W is determined based on W1 and W2 (W = W1 * W2).

Further, when the UE transmits the partial type 2 CSI using the uplink control channel, for example, the RI, the CQI, and the number of non-zero wideband amplitude coefficients per layer are used. , Are reported as CSI parameters. The number of the non-zero wideband amplitude factor corresponds to the beam number whose amplitude is not scaled to zero. In this case, since it is not necessary to transmit the information of the beam whose amplitude is zero (or less than or equal to a predetermined threshold value that can be regarded as equivalent to zero), the PMI is transmitted by transmitting the number of the non-zero wideband amplitude coefficient. Overhead can be reduced.

In Type 2 CSI feedback, Part 1 CSI may include RI, CQI, non-zero wideband amplitude factor numbers for each layer, and so on. Part 2 CSI may include PMI.

Since type 2 CSI feedback results in a large overhead, the higher the supported ranks and the greater the number of beam combinations in the type 2 CSI feedback, the greater the overhead.

Type 2 CSI may include one wideband (all subband) CSI and subband CSI for each subband. The wideband CSI may include a rotation factor, L beam selections, a maximum of 2 L beam combining coefficients per layer, wideband amplitudes per layer, and the like. The subband CSI for each subband may include subband amplitude, subband phase, and the like.

Thus, most of the Type 2 CSI overhead is due to the subband phase and subband amplitude for each subband. Also, the phase overhead (payload size) and the amplitude overhead (payload size) are different.

The UE may perform partial subband CSI reporting (partial subband CSI reporting) for some of the plurality of subbands in order to reduce CSI overhead.

As shown in FIG. 1, the UE may perform CSI reporting (CSI measurement) using a part of a plurality of consecutive subbands. The plurality of sub-bands may form a band, a component carrier (CC), a BWP (BandWidth Part, a partial band), and the like. Each subband may be a predetermined number of RBs (Resource Blocks). In the example of this figure, the UE is an even-numbered subband (subband index is even) out of N subbands # 0 to # N-1 (subband index # 0 to # N-1). The CSIs of # 0, # 2, ..., # N-2 (part 2 subband CSIs of even-numbered subbands) are reported.

Also, if the CSI report on the PUSCH contains two parts (Part 1 CSI, Part 2 CSI), the UE will select part of the Part 2 CSI according to the priority in the priority report levels table as shown in FIG. It may be omitted.

In the priority reporting level table, N _Rep is the number of CSI reports set to be carried on the PUSCH. Each of the N _Rep CSI reports carries a value y, which indicates whether it is carried to A-CSI / SP-CSI / P-CSI and whether it is carried to PUSCH / PUCCH, and whether or not to carry L1-RSRP. It is associated with the priority based on the indicated value k, the serving cell index c, and the report setting ID (reportConfigID) s, arranged in the order of priority, and tabled as CSI report n (n = 1, ..., N _Rep , CSI report index). Will be done.

The priority reporting level table has 2N _Rep + 1 Part 2 CSI entries. In the priority _{0 to 2n Rep} attached to each part 2CSI, priority 0 is the highest priority, priority _{2N Rep} is the lowest priority. 2N _Rep +1 pieces of CSI includes one of the Part 2 wide band _CSI, and _{2N Rep} number of part 2 sub-band CSI, the.

When the UE is scheduled to send a transport block on the PUSCH where the CSI report is multiplexed, the lowest priority CSI is started until the number of coded symbols based on the number of bits in CSI Part 2 meets a predetermined condition. , Part 2 CSI may be omitted.

In descending order of priority, _{part 2 wideband CSI for CSI reports 1 to N rep} , even-numbered (subband index) part 2 subband CSI for CSI report 1, and odd-numbered part 2 subband CSI for CSI report 1. , the even-numbered Part 2 sub-band CSI for the CSI report 2, the odd-numbered Part 2 sub-band CSI for the CSI report 2, ..., the even-numbered Part 2 sub-band CSI for the CSI report _{N rep,} odd for the CSI report _{N rep} Part 2 subband CSI of.

By allowing the UE to omit part of the Part 2 CSI in this way, the overhead of CSI reporting can be reduced.

The base station may also derive the amplitude and phase of the subband for which CSI is not reported by interpolating the amplitude and phase of the subband for which CSI is reported.

However, since the accuracy of interpolation is lowered by the overhead reduction, if the grain size of the overhead reduction is coarse, an appropriate accuracy may not be obtained in the interpolation.

Therefore, the present inventors have conceived a method of finely graining the overhead reduction in the CSI report.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to each embodiment may be applied individually or in combination.

In the following description, the CSI report may be read as at least one of the CSI measurement and the CSI report.

(Wireless communication method)
(Aspect 1)
The UE may select several subbands for Type 2 CSI reporting. In other words, the UE may omit some subbands in Type 2 CSI reporting (it is not necessary to make Type 2 CSI reporting for some subbands).

Specifically, the UE may perform at least one of the following selection methods 1 to 3.
<Selection Method 1> The UE selects several subbands that report both phase and amplitude (full reporting).
<Selection Method 2> The UE selects several subbands that report the phase and not the amplitude (phase reporting only).
<Selection Method 3> The UE selects several subbands that report the amplitude and not the phase (amplitude reporting only).

The UE may set a subband for at least one of full reporting, phase reporting, and amplitude reporting by higher layer signaling (eg, RRC signaling, or RRC signaling and MAC CE) or as specified in the specification. It may be decided based on a predetermined rule.

The UE may be configured by higher layer signaling whether to support phase reporting or amplitude reporting for each subband. The UE may be configured by higher layer signaling whether to support phase reporting or amplitude reporting for all subbands.

The UE may be configured for CSI reporting for subbands according to the following configuration methods 1-5.

<Setting method 1>
The UE may set the following three subband patterns by higher layer signaling.
(A) Complete report instruction information: Indicates the subband to be completely reported.
(B) Phase report instruction information: Indicates the subband to be phase reported.
(C) Amplitude report instruction information: Indicates the subband to be reported.

The subband pattern may have a number of bits in the number of subbands (bitmap). If the bit corresponding to the subband index is 1, it may indicate that the report is valid. For example, if the UE is configured with 10 subbands for Type 2 CSI reporting, the subband pattern may be 10 bits.

If the complete report instruction information is 1010101010, the UE determines subbands # 0, 2, 4, 6, and 8 as targets for complete report. When the phase report instruction information is 010000000001, the UE determines subbands # 1 and 9 as the target of phase report. When the amplitude report instruction information is 0001010100, the UE determines subbands # 3, 5, and 7 as targets for amplitude report.

<Setting method 2>
The UE may set the following two subband patterns by higher layer signaling. That is, the UE does not report the amplitude of the subband.
(A) Complete report instruction information (B) Phase report instruction information

<Setting method 3>
The UE may set the following three subband patterns by higher layer signaling.
(A) Report instruction information: Indicates the subband to be reported.
(B) Complete report instruction information: Indicates the subband to be completely reported.
(C) Phase report instruction information: Indicates the subband to be phase reported.

The UE may determine the subband for amplitude reporting based on the reporting instruction information, the complete reporting instruction information, and the phase reporting instruction information.

A specific example of the setting method 3 may be one of the following setting methods 3-1 to 3-3.

<< Setting method 3-1 >>
The reporting instruction information may indicate whether or not each subband is subject to reporting. The full report instruction information may indicate whether or not each subband is subject to full report. The phase report instruction information may indicate whether or not each subband is the target of phase report.

If the reporting instruction information is 1010101010, the UE determines subbands # 0, 2, 4, 6, and 8 to be reported. If the complete report instruction information is 010000000001, the UE determines subbands # 1 and 9 as targets for complete report. When the phase report instruction information is 00001000000, the UE determines subband # 4 as the target of phase report. The UE determines the remaining subbands # 3, 5 and 7 for amplitude reporting.

<< Setting method 3-2 >>
The reporting instruction information may indicate whether or not each subband is subject to reporting. The complete reporting instruction information may indicate whether or not each subband to be reported is subject to complete reporting. The phase report instruction information may indicate whether or not each subband to be reported is subject to phase report. The length of the complete report instruction information and the length of the phase report instruction information may be the number of subbands to be reported (the number of 1s in the report instruction information).

If the reporting instruction information is 1010101010, the UE determines subbands # 0, 2, 4, 6, and 8 to be reported. If the complete report instruction information is 10001, the UE determines subbands # 0 and 8 as targets for complete report. When the phase report instruction information is 00100, the UE determines subband # 4 as the target of phase report. The UE determines the remaining subbands # 2 and 6 for amplitude reporting.

Since the length of the complete report instruction information and the length of the phase report instruction information are shorter than the length of the report instruction information, the setting overhead can be suppressed as compared with the setting method 3-1.

<< Setting method 3-3 >>
The reporting instruction information may indicate whether or not each subband is subject to reporting. The complete reporting instruction information may indicate whether or not each subband to be reported is subject to complete reporting. The phase report instruction information may indicate whether or not each subband of the report targets other than the complete report target is the target of the phase report. The length of the complete report instruction information may be the number of subbands to be reported (the number of 1s in the report instruction information). The length of the phase report instruction information may be the number of subbands other than the target of the complete report (the number of 0s in the complete report instruction information) among the subbands to be reported.

If the reporting instruction information is 1010101010, the UE determines subbands # 0, 2, 4, 6, and 8 to be reported. If the complete report instruction information is 10001, the UE determines subbands # 0 and 8 as targets for complete report. When the phase report instruction information is 010, the UE determines subband # 4 as the target of phase report. The UE determines the remaining subbands # 2 and 6 for amplitude reporting.

Since the length of the complete report instruction information is shorter than the length of the report instruction information and the length of the phase report instruction information is shorter than the length of the complete report instruction information, the setting overhead can be suppressed as compared with the setting method 3-2. can.

<Setting method 4>
The UE may be configured with one of full reporting, phase reporting, and amplitude reporting by higher layer signaling. The UE may make a set report for all subbands.

Since it is not necessary to set a report for each subband, the overhead of setting can be suppressed.

<Setting method 5>
If the UE does not set one of full report, phase report, and amplitude report for each subband by upper layer signaling, the UE may perform full report of all subbands.

According to this aspect 1, by fine-graining the setting of the CSI report, the overhead of the type 2 CSI report and the accuracy of the interpolation of the CSI report can be appropriately controlled.

(Aspect 2)
The UE may support a priority reporting level table (CSI reporting priority rule) that takes into account fine particle size. The priority reporting level table may be rebuilt. The priority reporting level table may consider at least one of the following parameters:
・ CSI report index n
-Sub-band group (whether the sub-band index is even or odd, or a group of sub-band indexes based on a predetermined rule)
-Whether CSI is phase or amplitude

The sub-band group may be a group of sub-band indexes according to a predetermined rule. The number of subband groups may be greater than two.

For example, as shown in FIG. 3, the subband index may be divided into four subband groups (1/4 subband to 4/4 subband) by the remainder of the subband index by 4. The 1/4 subband may be a subband in which the remainder of the subband index of 4 is 0. The 2/4 subband may be a subband in which the remainder of the subband index of 4 is 1. The 3/4 subband may be a subband in which the remainder of the subband index of 4 is 2. The 4/4 subband may be a subband in which the remainder of the subband index of 4 is 3.

An example of the priority report level table will be described below.

FIG. 4 shows an example in which the phase and amplitude dimensions are added to the priority reporting level table. The priority reporting level table includes a phase part 2 CSI report and an amplitude part 2 CSI report for subbands with an even subband index for CSI report 1.

FIG. 5 shows an example in which the particle size of the subband is finely divided. The priority reporting level table is, in descending order of priority, for all 1/4 subband Part 2 CSI reports for CSI Report 1, all 2/4 subband Part 2 CSI reports for CSI Report 1, and all for CSI Report 1. Includes Part 2 CSI reports for 3/4 subbands, Part 2 CSI reports for all 4/4 subbands for CSI Report 1.

FIG. 6 shows an example in which the phase priority is higher than the amplitude priority for one CSI reporting index. In this priority report level table, the priority of the part 2 CSI report of the phase of the subband having an even subband index and the subband having an odd subband index with respect to the CSI report 1 is that the subband index is an even number. Subband and subband index are higher than the priority of Part 2 CSI reporting of subband amplitudes.

FIG. 7 shows an example in which the phase priority and the amplitude priority alternate with respect to the CSI report index in the even and odd subband indexes. In the priority reporting level table, in descending order of priority, the subband phase part 2 CSI report with an even subband index for CSI report 1 and the subband amplitude part 2CSI with an odd subband index for CSI report 1 Includes reports, Part 2 CSI reports of subband amplitudes with an even subband index for CSI Report 1, and Part 2 CSI reports of subband phases with an odd subband index for CSI Report 1.

The rules in these priority reporting level tables may be combined with each other.

The UE may determine the CSI to be omitted from the Part 2 wideband CSI and the Part 2 subband CSI of some subbands set by aspect 1 according to the priority reporting level table of aspect 2.

According to this aspect 2, the overhead of type 2 CSI reporting and the accuracy of interpolation of CSI reporting can be appropriately controlled by fine-graining the priority reporting level table.

(Aspect 3)
The UE may report the UE capability for CSI overhead reduction.

The UE capability may indicate at least one of the following capabilities 1 and 2.
<Capacity 1> Supports the UE to perform at least one of full reporting, phase reporting, and amplitude reporting for different subbands.
<Capacity 2> The UE supports one of full reporting, phase reporting, and amplitude reporting for all subbands.

One of the capabilities 1 and 2 is specified in the specification, and the UE may report the presence or absence of the specified capacity.

If the UE does not report such UE capability, the base station and UE may recognize one of the following options 1-5.
<Option 1> The UE supports full reporting.
<Option 2> The UE supports amplitude reporting.
<Option 3> The UE supports phase reporting.
<Option 4> The UE supports performing at least one of full reporting, phase reporting, and amplitude reporting for different subbands.
<Option 5> The UE is Rel. Fall back to 15 UE operations. Rel. Fifteen UEs support amplitude scaling. That is, the UE is set to wideband and subband amplitudes or wideband amplitudes with respect to the amplitude report by setting the truth of the upper layer signaling (subbandAmplitude). In addition, Rel. Fifteen UEs support only subbands for phase reporting.

According to this aspect 3, the UE can appropriately perform CSI reporting according to the UE capability.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the 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 each of the above-described embodiments of the present disclosure or a combination thereof.

FIG. 8 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using LTE (Long Term Evolution) specified by 3GPP (Third Generation Partnership Project), 5G NR (5th generation mobile communication system New Radio), and the like. ..

Further, the radio communication system 1 may support dual connectivity between a plurality of RATs (Radio Access Technology) (multi-RAT dual connectivity (MR-DC: Multi-RAT Dual Connectivity)). MR-DC is a dual connectivity between LTE (E-UTRA: Evolved Universal Terrestrial Radio Access) and NR (EN-DC: E-UTRA-NR Dual Connectivity), and a dual connectivity between NR and LTE (NE). -DC: NR-E-UTRA Dual Connectivity) and the like may be included.

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

The wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NN-DC: NR-NR Dual Connectivity) in which both MN and SN are NR base stations (gNB)). ) May be supported.

The wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. You may prepare. The user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode 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.

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: Carrier Aggregation) and dual connectivity (DC) using a plurality of component carriers (CC: Component Carrier).

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

Further, the user terminal 20 may perform communication using at least one of time division duplex (TDD: Time Division Duplex) and frequency division duplex (FDD: Frequency Division Duplex) in each CC.

The plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is an IAB (Integrated Access Backhaul) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.

The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one such as EPC (Evolved Packet Core), 5GCN (5G Core Network), and NGC (Next Generation Core).

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

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

The wireless access method may be referred to as a waveform. In the wireless communication system 1, another wireless access system (for example, another single carrier transmission system, another multi-carrier transmission system) may be used as the UL and DL wireless access systems.

In the wireless communication system 1, as downlink channels, downlink shared channels (PDSCH: Physical Downlink Shared Channel), broadcast channels (PBCH: Physical Broadcast Channel), and downlink control channels (PDCCH: Physical Downlink Control) shared by each user terminal 20 are used. Channel) and the like may be used.

Further, in the wireless communication system 1, as the uplink channel, the uplink shared channel (PUSCH: Physical Uplink Shared Channel), the uplink control channel (PUCCH: Physical Uplink Control Channel), and the random access channel (PRACH) shared by each user terminal 20 are used. : Physical Random Access Channel) may be used.

User data, upper layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. User data, upper layer control information, and the like may be transmitted by the PUSCH. Further, the MIB (Master Information Block) may be transmitted by the PBCH.

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

The DCI that schedules PDSCH may be called DL assignment, DL DCI, or the like, and the DCI that schedules PUSCH may be called UL grant, UL DCI, or the like. The PDSCH may be read as DL data, and the PUSCH may be read as UL data.

A control resource set (CORESET: COntrol REsource SET) and a search space may be used for the detection of PDCCH. CORESET corresponds to a resource for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.

One SS may correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. The "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. of the present disclosure may be read as each other.

Depending on the PUCCH, channel state information (CSI), delivery confirmation information (for example, HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement), ACK / NACK, etc.), scheduling request (SR: Scheduling Request) ) Etc. may be transmitted. The PRACH may transmit a random access preamble to establish a connection with the cell.

In this disclosure, downlinks, uplinks, etc. may be expressed without "links". Further, it may be expressed without adding "Physical" at the beginning of various channels.

In the wireless communication system 1, a synchronization signal (SS: Synchronization Signal), a downlink reference signal (DL-RS: Downlink Reference Signal), and the like may be transmitted. In the wireless communication system 1, the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DMRS: DeModulation). A reference signal), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), and the like may be transmitted.

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

Further, in the wireless communication system 1, as an uplink reference signal (UL-RS), a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), or the like may be transmitted. The DMRS may be called a user terminal specific reference signal (UE-specific reference signal).

(base station)
FIG. 9 is a diagram showing an example of the configuration of the base station according to the embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a 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 each be provided with one or more.

In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.

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 described based on the common recognition in the technical field according to the present disclosure.

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

The transmission / reception unit 120 may include a baseband unit 121, an RF (Radio Frequency) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on common recognition in the technical fields according to the present disclosure. be able to.

The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting / receiving antenna 130 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.

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

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

The transmission / reception unit 120 (transmission processing unit 1211) processes, for example, PDCP (Packet Data Convergence Protocol) layer processing and RLC (Radio Link Control) layer processing (for example, for data, control information, etc. acquired from the control unit 110). RLC retransmission control), MAC (Medium Access Control) layer processing (for example, HARQ retransmission control), and the like may be performed to generate a bit string to be transmitted.

The transmission / reception unit 120 (transmission processing unit 1211) performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) processing on the bit string to be transmitted. Transmission processing such as (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog transformation, and the like may be performed to output a baseband signal.

The transmission / reception unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to 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 perform amplification, filtering, demodulation to a baseband signal, and the like on the radio frequency band signal received by the transmission / reception antenna 130.

The transmission / reception unit 120 (reception processing unit 1212) performs analog-digital transform, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. Receive processing such as processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing, and user data Etc. may be obtained.

The transmission / reception unit 120 (measurement unit 123) may perform measurement on the received signal. For example, the measuring unit 123 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, or the like based on the received signal. The measuring unit 123 has received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)). , Signal strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 110.

The transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10 and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.

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

The transmission / reception unit 120 may transmit the channel status information report setting. The transmission / reception unit 120 may receive the channel state information.

(User terminal)
FIG. 10 is a diagram showing an example of the configuration of the user terminal according to the embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. The control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.

In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.

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 described based on the common recognition in the technical field according to the present disclosure.

The control unit 210 may control signal generation, mapping, and the like. The control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.

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

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

The transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.

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

The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.

The transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output the baseband signal.

Whether or not to apply the DFT process may be based on the transform precoding setting. The transmission / reception unit 220 (transmission processing unit 2211) described above for transmitting a channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled. The DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.

The transmission / reception unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to 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 unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, and the like on the signal in the radio frequency band received by the transmission / reception antenna 230.

The transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.

The transmission / reception unit 220 (measurement unit 223) may perform measurement on the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 210.

The transmission unit and the reception unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmission / reception unit 220, the transmission / reception antenna 230, and the transmission line interface 240.

Further, the control unit 210 may generate one channel state information of phase and amplitude for the subband for which the channel state information report (for example, type 2 CSI report) is set. The transmission / reception unit 220 may report the channel state information.

Further, the control unit 210 is instructed to report one of the phase and amplitude (for example, complete report), the phase (for example, phase report), and the amplitude (for example, amplitude report). , At least one of report instruction information, complete report instruction information, phase report instruction information, amplitude report instruction information), the channel state information may be generated.

Further, the instruction information may instruct each subband to report one of the phase and the amplitude, the phase and the amplitude.

The instruction information may also instruct all subbands to report one of phase and amplitude, phase and amplitude.

Further, the control unit 210 determines the channel state information to be reported according to a predetermined priority (for example, priority reporting level table), and the priority is set to a plurality of groups of subbands (for example, subband group). , The subband channel state information may be based on at least one of phase and amplitude.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Here, the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (constituent unit) for functioning transmission may be referred to as a transmitting unit, a transmitter, or the like. As described above, the method of realizing each of them is not particularly limited.

For example, the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 11 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment. The base station 10 and the user terminal 20 described above 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 this disclosure, the wording of a device, a circuit, a device, a section, a unit and the like can be read as each other. The hardware configuration 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 not to include some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors. The processor 1001 may be mounted by one or more chips.

For each function of the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.

The memory 1002 is a computer-readable recording medium, such as ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EPROM (Electrically EPROM), RAM (Random Access Memory), or at least other suitable storage medium. It may be composed of one. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and is, for example, a flexible disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (CD-ROM (Compact Disc ROM), etc.)), a digital versatile disc, and the like. At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. The storage 1003 may be referred to as an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. Communication device 1004 includes, for example, 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). It may be composed of. For example, the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).

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

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

Further, the base station 10 and the user terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
The terms described in the present disclosure and the terms necessary 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 read interchangeably. Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot (Pilot), a pilot signal, or the like depending on the applied standard. Further, the component carrier (CC: Component Carrier) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transmission / reception. At least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.

The slot may be composed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.). In addition, the slot may be a time unit based on numerology.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. The mini-slot may also be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot. A PDSCH (or PUSCH) transmitted in a time unit larger than the minislot may be referred to as a PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each. The time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.

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

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

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

When one slot or one minislot is called TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, and the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

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

The RB may also include one or more symbols in the time domain and may be one slot, one minislot, one subframe or one TTI in length. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as a wireless frame, a subframe, a slot, a minislot, and a symbol are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained in a slot, the number of symbols and RBs contained in a slot or minislot, and included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, radio resources may be indicated by a given index.

The names used for parameters and the like in the present disclosure are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements. Is not a limited name in any way.

The information, signals, etc. described in the present disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Further, information, signals, and the like can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers. Information, signals, etc. may be input / 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. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to another device.

The notification of information is not limited to the embodiments / embodiments described in the present disclosure, and may be performed by other methods. For example, the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), and upper layer signaling (for example, RRC (Radio Resource Control)). ) Signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals or a combination thereof May be good.

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

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

The determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

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

The terms "system" and "network" used in this disclosure may be used interchangeably. The "network" may mean a device (eg, a base station) included in the network.

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "pseudo-colocation (QCL: Quasi-Co-Location)", "TCI state (Transmission Configuration Indication state)", "spatial relationship" (Spatial relation), "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", " Terms such as rank, resource, resource set, resource group, beam, beam width, beam angle, antenna, antenna element, and panel are compatible. Can be used for.

In the present disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "Transmission point (TP)", "Reception point (RP)", "Transmission / reception point (TRP)", "Panel", "Cell" , "Sector", "cell group", "carrier", "component carrier" and the like can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head)). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , Handset, user agent, mobile client, client or some other suitable term.

At least one of a base station and a mobile station may be referred to as a transmitting device, a receiving device, a wireless communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the user terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the user terminal in the present disclosure may be read as 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, the operation performed by the base station may be performed by its upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal are performed by one or more network nodes other than the base station and the base station (for example, the base station). It is clear that it can be performed by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these) or a combination thereof.

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication). system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered Trademarks) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), LTE 802. 20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other systems using appropriate wireless communication methods, next-generation systems extended based on these, and the like may be applied. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first", "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

The term "determining" as used in the present disclosure may include a wide variety of actions. For example, "judgment" means "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up", "search", "inquiry". For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment".

In addition, "judgment (decision)" includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as "judgment (decision)" such as "accessing" (for example, accessing data in memory).

In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

The "maximum transmit power" described in the present disclosure may mean the maximum value of the transmit power, may mean the nominal UE maximum transmit power, or may mean the nominal UE maximum transmit power (the nominal UE maximum transmit power). It may mean rated UE maximum transmit power).

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

In the present disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-comprehensive examples, the radio frequency domain, microwaves. It can be considered to be "connected" or "coupled" to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, and the like.

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

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example a, an and the in English, the disclosure may include the plural nouns following these articles.

Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as an amended or modified mode without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for purposes of illustration and does not bring any limiting meaning to the invention according to the present disclosure.

Claims (6)

A control unit that generates one channel state information of phase and amplitude for the subband for which the channel state information report is set, and a control unit.
A user terminal comprising a transmission unit for reporting the channel state information. The first aspect of the present invention, wherein the control unit generates the channel state information based on the instruction information instructing to report one of the phase and the amplitude, the phase, and the amplitude. User terminal. The user terminal according to claim 2, wherein the instruction information instructs each subband to report one of the phase and the amplitude, the phase and the amplitude. The user terminal according to claim 2, wherein the instruction information instructs all the subbands to report one of the phase and the amplitude, the phase and the amplitude. The control unit determines the channel state information to be reported according to a predetermined priority.
The user terminal according to claim 1, wherein the priority is based on at least one of a plurality of groups of subbands and whether the channel state information of the subbands is phase or amplitude. The process of generating one channel state information of phase and amplitude for the subband for which the channel state information report is set, and
A method for wireless communication of a user terminal, which comprises a step of reporting the channel state information.

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