CN112335282A - User terminal and radio base station - Google Patents

Abstract

A user terminal according to an aspect of the present disclosure includes: a receiving unit that receives at least one setting information; and a control unit configured to determine the plurality of Channel State Information (CSI) reports corresponding to the plurality of transmission points, respectively, based on the at least one piece of configuration information. According to an aspect of the present invention, CSI measurement and reporting for a plurality of transmission points can be appropriately performed.

Description

User terminal and radio base station

Technical Field

The present invention relates to a user terminal and a radio base station in a next-generation mobile communication system.

Background

In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) is standardized for the purpose of higher data rate, lower latency, and the like (non-patent document 11). Furthermore, LTE-a (LTE-Advanced, LTE re1.10, 11, 12, 13) is standardized for the purpose of further increasing the capacity and the height of LTE (LTE re1.8, 9).

Successor systems of LTE (e.g., FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New Radio Access), FX (Future generation Radio Access), LTE rel.14 or 15 and so on) are also being studied.

In existing LTE systems (e.g., LTE re1.8-13), a User terminal (UE) periodically and/or aperiodically transmits Channel State Information (CSI) to a base station. The UE transmits CSI using a Physical Uplink Control Channel (PUCCH) and/or a Physical Uplink Shared Channel (PUSCH).

Documents of the prior art

Non-patent document

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

Disclosure of Invention

Problems to be solved by the invention

In a future wireless communication system (for example, NR), a technology for performing DL transmission from a plurality of transmission points is being studied.

However, if CSI reports (feedback) for a plurality of transmission points cannot be appropriately performed, there is a concern that a decrease in system performance may occur.

Therefore, an object of the present invention is to provide a user terminal and a radio base station capable of appropriately performing CSI reporting for a plurality of transmission points.

Means for solving the problems

One aspect of the present invention relates to a user terminal including: a receiving unit for receiving at least one setting message; and a control unit configured to determine the plurality of Channel State Information (CSI) reports corresponding to the plurality of transmission points, respectively, based on the at least one piece of configuration information.

Effects of the invention

According to an aspect of the present invention, CSI reports can be appropriately performed for a plurality of transmission points.

Drawings

Fig. 1A and 1B show an example of NCJT.

Fig. 2A and 2B are diagrams illustrating an example of RS structure and PDSCH transmission at a plurality of transmission points.

Fig. 3 is a diagram showing an example of CSI reports of a plurality of CSI processes.

Fig. 4 is a diagram showing an example of a plurality of CSI report settings.

Fig. 5A and 5B are diagrams showing an example of CSI reports for a plurality of transmission points.

Fig. 6A to 6D are diagrams showing an example of a CSI report structure for a plurality of transmission points.

Fig. 7A and 7B are diagrams illustrating an example of the CSI report structure according to the first embodiment.

Fig. 8A and 8B are diagrams illustrating an example of the configuration of the channel measurement resource and the interference measurement resource according to the first embodiment.

Fig. 9A and 9B are diagrams illustrating an example of CSI reports according to option 1 of the second embodiment.

Fig. 10A to 10C are diagrams showing an example of CSI reporting of option 2 of the second embodiment.

Fig. 11 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 12 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment.

Fig. 13 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment.

Fig. 14 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment.

Fig. 15 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment.

Fig. 16 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment.

Detailed Description

In NR, a UE measures a channel state using a predetermined reference signal (or a resource for the reference signal). The Reference Signal for Channel State measurement may also be referred to as a CSI-RS (Channel State Information-Reference Signal) or the like. In addition, the UE may also measure the Channel state using signals other than CS1-RS, such as a Synchronization Signal/Broadcast Channel (SS/PBCH) block, a Synchronization Signal/Physical Broadcast Channel (sync Signal/Physical Broadcast Channel), a demodulation reference Signal, and the like.

The CSI-RS resource may also include at least one of Non Zero Power (NZP) CSI-RS and CSI-IM (Interference Management). The SS/PBCH block is a block including a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SS), and a PBCH, and may be referred to as an SS block.

The UE feeds back (reports) Channel State Information (CSI) to a Base Station (for example, a BS (Base Station), a Transmission/Reception Point (TRP), an enb (enodeb), a gnb (nr nodeb), or the like) at a predetermined timing based on a measurement result of a reference signal or the like.

The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS/PBCH Block Resource Indicator (SSBRI), a Layer Identifier (LI), a Layer Indicator, a Rank Identifier (RI), a Rank Indicator (Rank Indicator), and L1-RSRP (Layer 1Reference Received Power in Layer 1).

The CSI may also have a plurality of parts (part). The first part of CSI (CSI part 1) may also contain information (e.g., RI) with a relatively small number of bits. The second part of CSI (CSI part 2) may include information (for example, CQI) having a relatively large number of bits, such as information determined based on CSI part 1.

As a feedback method of CSI, studies are being made: (1) periodic CSI (P-CSI: Periodic CSI) reports, (2) Aperiodic CSI (a-CSI: Aperiodic CSI) reports, (3) Semi-Persistent (Semi-Persistent ) CSI (SP-CSI: Semi-Persistent CSI) reports, and the like.

The UE may also notify Information (may also be referred to as CSI report setting Information) about a resource for reporting at least one of P-CSI, SP-CSI, and a-CSI using higher layer signaling, physical layer signaling (e.g., Downlink Control Information (DCI)), or a combination thereof.

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

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

The CSI report setting information may include information on a report period, an offset (offset), and the like, for example, and may be expressed in predetermined time units (slot units, subframe units, symbol units, and the like). The CSI report configuration information may include a configuration ID (CSI-ReportConfigId), and may specify parameters such as the type of CSI reporting method (whether SP-CSI or not), the reporting period, and the like, based on the configuration ID. The CSI report setting information may include information (CSI-ResourceConfigId) indicating which reference signal (or which reference signal resource) is used to report the measured CSI.

In addition, studies have been made on non-coherent DL (e.g., PDSCH) transmissions from a plurality of transmission points in future wireless communication systems (e.g., after rel. 16). Transmission by coordinating DL signals (or DL channels) that are incoherent from a plurality of Transmission points may also be referred to as NCJT (Non-Coherent Joint Transmission). Also, in the present disclosure, a Transmission Point may be replaced with a Transmission/Reception Point (TRP), a panel (pane1, an antenna panel, a plurality of antenna elements), an antenna port, or a cell (cell). The Transmission points (TRP, panel, etc.) may be replaced with, for example, beams, Spatial filters (Spatial filters), Reference Signal (RS) resources, quasi Co-location (qcl), Transmission Configuration Information (TCI), or a concept in which these are grouped.

It is also conceivable to Control scheduling of the non-coherent PDSCH transmitted from each of the plurality of transmission points by using one or more DCI (Downlink Control Information). For example, in order to schedule PDSCH transmitted from a plurality of transmission points, at least one of a plurality of downlink control channels (e.g., PDCCH) and DCI is used.

Fig. 1A shows a case where a PDSCH (e.g., a PDSCH using NCJT) is transmitted from a multi-panel to a UE, and fig. 1B shows a case where a PDSCH (e.g., a PDSCH using NCJT) is transmitted from a plurality of transmission/reception points (TRPs) to a UE.

In this case, it is also considered that DCI is individually set for scheduling a PDSCH transmitted from each transmission point (e.g., panel or TRP). For example, the UE may be configured to transmit first DCI # a for scheduling a PDSCH transmitted from transmission point # a and second DCI # B for scheduling a PDSCH transmitted from transmission point # B.

Multiple transmission points may also be connected via a wired or wireless interface.

The following assumptions 1 and 2 were investigated for NCJT.

It is assumed that different Transmission points (panels or TRPs (Transmission/Reception points)) in 1, 2 are set to be the same for large scale properties (large scale properties) of the channel (QCL (quasi co-located)). The large-scale characteristics include at least one of delay spread, doppler shift, average gain, average delay, and Spatial Rx Parameter. In addition, the spatial reception parameters may also correspond to reception beams (e.g., reception analog beams) of the UE, and the beams may also be determined based on the spatial QCL. At least one element of the QCL and QCL may be replaced with a sQCL (spatial QCL).

< assumption 1>

In assumption 1, as shown in fig. 2A, the RS (Reference Signal) structure and PDSCH transmission for different transmission points are made transparent (transparent) to the UE.

In this case, UE operation for CSI measurement and CSI reporting becomes an issue. For example, a mechanism of whether CSI feedback (reporting) for a plurality of transmission points can be applied to the current CSI feedback becomes a problem.

< assumption 2>

In assumption 2, as shown in fig. 2B, the RS structure and PDSCH transmission for different transmission points are non-transparent (non-transparent) to the UE.

In this case, CSI feedback to different transmission points should be independent of each other. In this case, there is a problem as to whether or not the current CSI feedback mechanism can be applied, and how to improve the CSI feedback mechanism if it cannot be applied.

In CoMP (Coordinated Multi-Point transmission/reception) in LTE (rel.10), CSI reporting based on multiple CSI processes is supported. For example, as shown in fig. 3, a plurality of CSI processes are set to the UE. Different CSI processes may also represent CSI reports for different transmission points.

The CSI feedback framework (frame) in NR (rel.15) was studied to support CSI measurements based on multiple CSI-RS resources. The CSI measurement may also be applied to CSI measurement for CoMP.

For example, as shown in fig. 4, a plurality of CSI report settings (setting) #1 to # n may indicate resource settings #1 to # n, respectively. Each resource setting may also include at least one of the plurality of CSI-RS resource sets. Each set of CSI-RS resources may also contain at least one CSI-RS resource.

Here, CSI feedback considered in hypothesis 1 will be described.

For the UE, the CSI feedback in 1 is assumed to be the same as for the case of a single transmission point. In case the RS structure is not transmission point specific (specific), it is transparent to the UE whether it is an RS from a different transmission point. In this case, the CSI feedback may also be in accordance with a setting of at least one of existing higher layer signaling (e.g., RRC signaling) and physical layer signaling (e.g., DCI).

At least one of the following schemes 1 and 2 may be used for setting CSI feedback.

< scheme 1>

When the UE is set with the same CSI report content (report amount) for different transmission points by higher layer signaling, the UE performs feedback by combining CSI. In example #1 shown in fig. 5A, the UE is set with RS structures for both panel #1 and panel #2, and reports CSI for both panel #1 and panel # 2.

< scheme 2>

When the UE is set with different CSI report contents for different transmission points by higher layer signaling, the UE may independently feed back CSI because parameters such as CSI offset (offset) are different. In example #2 shown in fig. 5B, the UE is set with an RS structure for TRP #1 and an RS structure for TRP #2, and reports CSI for TRP #1 and CSI for TRP # 2. The UE may report the CSI for TRP #1 to TRP #1 and the CSI for TRP #2 to TRP # 2.

The present CSI feedback framework supports both scheme 1 and scheme 2. In scheme 1, as in example #1 shown in fig. 5A, one CSI report structure (RS structure) for acquiring CSI for a plurality of transmission points may be used. In scheme 2, as in example #2 shown in fig. 5B, a plurality of CSI report structures (RS structures) for acquiring CSI for a plurality of transmission points may be used. In scheme 2, when the RS structure and the CSI report content are the same, information such as higher layer signaling and CSI report may become redundant.

In the CSI feedback method supported by the current CSI feedback framework, whether to feed back CSI to different transmission points is transparent to the UE.

In this CSI feedback scheme, the RS configuration is set for each transmission point transparently to the UE using a higher layer signaling, as in the CSI report quality (report quality) and the report configuration type (indicating one of P-CSI, SP-CSI, and a-CSI). In other words, the UE does not know whether the CSI reports are used for different transmission points or for the same transmission point.

In example #1 corresponding to scheme 1, as shown in fig. 6A, only one CSI parameter set is set to the UE for CSI reporting based on a plurality of transmission points. The CSI parameter set may also contain CRI, RI, PMI, CQI.

As shown in fig. 6B, the higher layer parameters (RRC information element) corresponding to the CSI reporting structure (CSI-ReportConfig) of example #1 may also include at least one of a resource for Channel Measurement (CM) (resource for channel measurement), a resource for Interference Measurement (IM) (CSI-IM-resource for interference), a non-zero power CSI-RS resource for interference measurement (nzp-CSI-RS-resource for interference), a reporting structure type (reportConfigType), and a reporting quantity (reportQuantity).

In example #2 corresponding to scheme 2, as shown in fig. 6C, 2 CSI parameter sets are set in the UE for CSI reports for 2 transmission points (TRPs).

As shown in fig. 6D, the higher layer parameters corresponding to the two CSI report structures (CSI-ReportConfig #1, CSI-ReportConfig #2) of example #2 may include the same parameters as those of the CSI report structure of example #1, respectively.

For CSI reporting, all parameters of CSI may not be set for the UE. For example, in the case where the number of CSI-RS resources is 1, a CRI (CSI-RS resource indicator) is not required.

Here, CSI feedback considered in hypothesis 2 will be described.

In assumption 2, the CSI for each transmission point is not transparent to each UE. As in case of assumption 1, for example, when RSs are set independently to the UE for all transmission points by different CSI-RS resource settings, whether CSI feedback is 1 packet or a plurality of packets is set in accordance with higher layer signaling.

The UE may also perform CSI feedback using the existing CSI feedback framework by scheme 1 or scheme 2, which is the same as in case 1. However, if 2 is used at a plurality of transmission points, as shown in fig. 5B, there is a high possibility that a plurality of CSI report settings are required.

Even if a plurality of CSI reports are set to the UE and are completely independent reports, since 2 transmission points can partially share information on CSI, there is a concern that information such as higher layer signaling and CSI reports may become redundant.

As described above, in case of assuming that 1, at least one of the RS configuration and the report content is the same in the setting of a plurality of CSI reports for a plurality of transmission points, there is a possibility that the setting information of the higher layer signaling becomes redundant. As described above, in case 2, even when a plurality of independent CSI reports are set for a plurality of transmission points, there is a possibility that the CSI reports become redundant.

Thus, the inventors of the present invention thought: the user terminal determines a plurality of CSI reports corresponding to the plurality of transmission points, respectively, based on the at least one piece of setting information, thereby suppressing overhead of at least one of CSI setting and CSI reporting.

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

In the present disclosure, "interference" and "interference power" may be interchanged with each other. "interference" may also be replaced by SINR, SNR, RSRQ, RSSI, other interference related indicators.

In the present disclosure, the Resource for Interference Measurement may also be replaced with at least one of an IMR (Interference Measurement Resource), a CSI-IM (Interference Measurement) Resource, a Zero Power (ZP: Zero Power) CSI-RS Resource, a Non-Zero Power (NZP: Non-Zero Power) CSI-RS Resource, an SS/PBCH block Resource, and the like.

In the present disclosure, the transmission point and the TRP may be replaced by a panel. That is, the TRPs #1 and #2 may also be different panels #1 and # 2.

In the present disclosure, the UE may determine a plurality of CSI reports corresponding to a plurality of transmission points, respectively. The UE may transmit the CSI report for each transmission point to the corresponding transmission point, may transmit the CSI report to a set transmission point, or may transmit the CSI report to a plurality of transmission points. The UE may also send CSI reports using PUCCH, PUSCH, or other uplink channels.

< first mode >

In the first approach, a modification of the CSI feedback framework of the present state (rel.15) is used.

The UE may also be configured with a CSI reporting structure (configuration). The CSI report structure may also contain a common parameter having 1 information element and a dedicated parameter having N information elements. The N information elements of the dedicated parameter may also correspond to the N transmission points, respectively. The common parameters may also be common to the N transmission points. The UE may also perform CSI measurement and CSI reporting for each transmission point using common parameters and dedicated parameters corresponding to the transmission points.

At least one of a plurality of reporting amounts (reporting amounts), a plurality of reporting structure types (reporting configtype), and a plurality of resources for interference (resources for interference) may be set for a given CSI reporting structure based on the current CSI feedback framework.

< example 1-1>

As shown in fig. 7A, a plurality of reportquantites and a plurality of reportconfigtypes may be set for the UE based on the same RS structure (RS resource structure). The RS structure (resource) is common for both sets (reportQuantity, reportConfigType). The measurement amount requirement (reportQuantity) may be different for each transmission point, and the report configuration type (reportConfigType) may be different.

< examples 1 and 2>

As shown in fig. 7B, a plurality of reportquantites, a plurality of reportConfigType, and a plurality of resources for interference may be set for the UE based on the same RS structure. The resource of the RS for channel measurement is common to the two sets (reportQuantity, reportConfigType, resources for interference). The measurement amount requirements (report amount, reportQuantity) may be different for each transmission point, the report configuration type (reportConfigType) may be different, and the interference measurement resources may be different.

The example 1-1 can also be applied to a case where RS structures including a channel measurement RS and an interference measurement RS are the same and reportmetrics are different, or a case where a plurality of reportmetrics (for example, a beam report and a CSI report) based on the same resource are expected, and where RS structures including a channel measurement RS and an interference measurement RS are the same.

The examples 1 and 2 can also be applied to the case where the channel measurement RSs are the same and the interference measurement RSs are different. In this case, the CSI report amounts (types) differ for different transmission points.

Next, a UE operation for CSI report setting of the first mode is described.

When the UE is set with the CSI-ReportConfig having the higher layer parameters ReportQuantity #1_1 and ReportQuantity #1_2, the UE may determine the CSI parameters set in ReportQuantity #1_1 and ReportQuantity #1_2 based on the corresponding resource configuration.

When the UE is set with only one CSI-ResourceConfig for channel measurement and only one CSI-ResourceConfig for interference measurement, the UE may assume that ReportQuantity #1_1 and ReportQuantity #1_2 having the same CSI parameter are not received (may not be expected to be received).

When only one CSI-ResourceConfig for the second channel measurement and one more CSI-ResourceConfig than for the interference measurement are set for the UE, the UE may assume a plurality of interference measurement resources corresponding to the same channel measurement resource, as shown in fig. 8A.

When one more CSI-ResourceConfig than that for channel measurement and one more CSI-ResourceConfig than that for interference measurement are set for the UE, as shown in fig. 8B, the UE may be assumed to be in one-to-one correspondence with the CSI-ResourceConfig for channel measurement and the CSI-ResourceConfig for interference measurement.

According to the first aspect, when a part of CSI report structures for a plurality of transmission points are common and other parameters (at least one of a report amount, a report structure type, and an interference measurement resource) are different, overhead of higher layer parameters can be reduced. In addition, by individually setting at least one of the report amount, the report structure type, and the interference measurement resource to the transmission point, the CSI report can be flexibly set.

< second mode >

The UE may independently feed back a part or all of CSI for each transmission point. In addition, the UE may also feed back CSI for different transmission points by at least partially different methods.

The UE may be configured with a CSI report structure (configuration) for each transmission point. The UE may also perform CSI measurement and CSI reporting for each transmission point using the corresponding CSI reporting structure.

The CSI report for the first transmission point may also depend on the CSI report for the second transmission point. For example, the CSI report for the second transmission point may also supplement the CSI report for the first transmission point. The second transmission point may receive the CSI report for the first transmission point from the first transmission point or the CSI report for the first transmission point from the UE.

At least one of the following option 1 and option 2 may also be used.

< option 1>

The UE may be configured with differential CSI and report the differential CSI for one transmission point in a plurality of transmission point scenarios.

For example, as shown in fig. 9A, the UE may feed back the complete CSI parameter to the TRP #1, and feed back the CSI parameter for the TRP #2 with respect to the differential CSI parameter of the TRP #1 to the TRP # 2.

The differential CSI parameter may be an offset or a ratio of the CSI parameter for the TRP #1 with respect to the CSI parameter for the TRP # 1. In the case that the range of values of the differential CSI parameter is narrower than the range of values of the full CSI parameter, the magnitude of the differential CSI parameter may also be smaller than the magnitude of the full CSI parameter. In the CSI report (differential CSI parameter set) of TRP #2, some CSI parameters may be differential CSI parameters, and other CSI parameters may be full CSI parameters.

The NW (e.g., transmission point) may also obtain the full CSI parameter of the second transmission point based on the full CSI parameter of the first transmission point and the differential CSI parameter of the second transmission point.

A new report quantity (reportQuantity) option may also be added to the specification. For example, as shown in fig. 9B, at least one of the CRI, RI, the set of difference values between PMI and CQI (CRI-RI-PMI-CQI-differential), the set of difference values between RI, PMI and CQI (RI-PMI-CQI-differential), and the difference value between CQI alone may be included in the report amount selection item.

According to option 1, the overhead of CSI feedback can be reduced compared to the case where the complete CSI parameter is fed back to each transmission point.

< option 2>

The UE may set different CSI parameters for different transmission points and perform reporting.

For example, the UE may report several CSI parameters (for example, one of CRI only, CRI and RI set, CRI and RI and PMI set, and RI, RI and PMI set) common to a plurality of transmission points to one transmission point. Further, the UE may report the CSI parameter specific to the transmission point to each transmission point.

The NW may also obtain a complete set of CSI parameters for each transmission point by synthesizing multiple sets of CSI parameters for multiple transmission points.

The plurality of CSI parameter sets for the plurality of transmission points may be at least one of the following examples 2-1 and 2-2.

< example 2-1>

As shown in fig. 10A, as a CSI report for TRP #1, a set of CRI, RI, PMI, and CQI is set to the UE, and as a CSI report for TRP #2, a set of PMI and CQI is set to the UE. The CRI and RI may be parameters common to TRP #1 and TRP # 2. The PMI and CQI may be parameters specific to TRP #1 and TRP # 2.

< example 2-2>

As shown in fig. 10B, a set of CRI and RI may be set to the UE as the CSI report for TRP #1, and a set of PMI and CQI may be set to the UE as the CSI report for TRP # 2. The CRI, RI, PMI, and CQI may also be common to TRP #1 and TRP # 2.

According to option 2, the overhead of CS1 feedback can be reduced compared to the case where a complete CSI parameter set is fed back to each transmission point. In addition, the CSI parameter common to a plurality of transmission points can facilitate inter-transmission-point coordination.

A new report quantity (report quantity) option may be added to the specification. For example, as shown in fig. 10C, only at least one of CQI (CQI), PMI and CQI set (PMI-CQI), and RI and PMI and CQI set (RI-PMI-CQI) may be included in the report amount option.

The UE operation for CSI report setting of the second mode will be explained.

The UE may not assume (expect) that, for all report settings, a higher layer parameter reporting quality is set in which only PMI and CQI (PMI-CQI) or only CRI and RI and a difference between PMI and CQI (CRI-RI-PMI-CQI-differential) are set as a set (set).

When the UE is set with a higher layer parameter ReportQuantity and sets PMI and CQI (PMI-CQI) for the higher layer parameter ReportQuantity, the UE may determine the CSI parameter on the condition of the reported CRI and RI (CRI-RI). The reported CRI-RI may also contain only the CRI and the value reported in the RI.

When the UE is set with a higher layer parameter ReportQuantity and cqi (cqi) is set as a set for the higher layer parameter ReportQuantity, the UE may determine the CSI parameter with the reported CRI, RI, and PMI (CRI-RI-PMI) or the reported CRI and RI (CRI-RI) as a condition. The reported CRI-RI-PMI may also contain the reported values and PMIs in the CRI and RI.

When the UE is set with a higher layer parameter reporting parameter and a difference value (CRI-RI-PMI-CQI-differential) of CRI, RI, PMI, and CQI is set for the higher layer parameter reporting parameter, the UE may determine the CSI parameter using the reported CRI, RI, PMI, and CQI (CRI-RI-PMI-CQI) as a condition. The reported CRI-RI-PMI may also contain CRI and reported values in RI, PMI, and CQI.

According to the second aspect, compared to the case where a complete CSI parameter set is fed back to each transmission point, the overhead of CSI feedback can be reduced.

(Wireless communication System)

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

Fig. 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. In the wireless communication system 1, at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) can be applied, in which a plurality of basic frequency blocks (component carriers) are integrated into one unit of a system bandwidth (for example, 20MHz) of the LTE system.

In addition, the wireless communication system 1 may be referred to as LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER3G, IMT-Advanced, 4G (4th generation mobile communication system, fourth generation mobile communication system), 5G (5th generation mobile communication system, fifth generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), and the like, and may also be referred to as a system implementing them.

The wireless communication system 1 includes: a radio base station 11 forming a macro cell C1 having a large coverage area; and a radio base station 12(12a-12C) disposed in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 is arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the illustrated embodiments.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. The user terminal 20 envisages the use of either CA or DC while using macro cell C1 and small cell C2. Further, the user terminal 20 may also apply CA or DC using a plurality of cells (CCs).

Between the user terminal 20 and the radio base station 11, communication can be performed using a carrier having a narrow bandwidth (also referred to as an existing carrier, legacy carrier, or the like) in a relatively low frequency band (e.g., 2 GHz). On the other hand, between the user terminal 20 and the radio base station 12, a carrier having a bandwidth in a relatively high frequency band (for example, 3.5GHz, 5GHz, or the like) may be used, and the same carrier as that between the radio base station 11 may also be used. The configuration of the frequency band used by each radio base station is not limited to this.

The user terminal 20 can perform communication in each cell using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD). In each cell (carrier), a single parameter set (Numerology) may be applied, or a plurality of different parameter sets may be applied.

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel, and may be at least one of a subcarrier interval, a bandwidth, a symbol length, a cyclic prefix length, a subframe length, a TTI length, the number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transmitter/receiver in the frequency domain, a specific windowing (windowing) process performed by the transmitter/receiver in the time domain, and the like.

For example, when at least one of the subcarrier spacing and the number of OFDM symbols constituting an OFDM symbol differs for a certain physical channel, it may be said that parameter sets (Numerology) differ.

Wireless base station 11 and wireless base station 12 (or between two wireless base stations 12) may be connected by wire (for example, optical fiber conforming to Common Public Radio Interface (CPRI), X2 Interface, or the like) or wirelessly.

The radio base station 11 and each radio base station 12 are connected to the upper station apparatus 30, and are connected to the core network 40 via the upper station apparatus 30. The upper node apparatus 30 includes, for example, an access gateway apparatus, a Radio Network Controller (RNC), a Mobility Management Entity (MME), and the like, but is not limited thereto. Each radio base station 12 may be connected to the upper station apparatus 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage area, and may be referred to as a macro base station, a sink node, an enb (enodeb), a transmission/reception point, or the like. The Radio base station 12 is a Radio base station having a local coverage area, and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, an HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission/reception point, or the like. Hereinafter, the radio base stations 11 and 12 are collectively referred to as the radio base station 10 without distinguishing them.

Each user terminal 20 is a terminal supporting various communication schemes such as LTE and LTE-a, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

In the wireless communication system 1, as a radio Access scheme, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to a downlink, and at least one of Single Carrier Frequency Division Multiple Access (SC-FDMA) and OFDMA is applied to an uplink.

OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier to perform communication. SC-FDMA is a single-carrier transmission scheme in which a system bandwidth is divided into bands each composed of one or continuous resource blocks for each terminal, and a plurality of terminals use different bands to reduce interference between terminals. The uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In the radio communication system 1, as Downlink channels, a Downlink Shared Channel (PDSCH) Shared by each user terminal 20, a Broadcast Channel (PBCH), a Downlink control Channel, and the like are used. User data, higher layer control Information, SIB (System Information Block), and the like are transmitted through the PDSCH. Also, MIB (Master Information Block) is transmitted through PBCH.

The Downlink Control Channel includes a PDCCH (Physical Downlink Control Channel), an EPDCCH (Enhanced Physical Downlink Control Channel), a PCFICH (Physical Control Format Indicator Channel), a PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. Downlink Control Information (DCI) including scheduling Information of at least one of the PDSCH and the PUSCH is transmitted through the PDCCH.

The DCI scheduling DL data reception may be referred to as DL assignment (assignment), and the DCI scheduling UL data transmission may be referred to as UL grant (grant).

The number of OFDM symbols for PDCCH may also be transmitted through PCFICH. Transmission acknowledgement information (for example, also referred to as retransmission control information, HARQ-ACK, ACK/NACK, and the like) of HARQ (Hybrid Automatic Repeat reQuest) for PUSCH may be transmitted through PHICH. EPDCCH and PDSCH (downlink shared data channel) are frequency division multiplexed, and used for transmission of DCI and the like as in PDCCH.

In the radio communication system 1, as Uplink channels, an Uplink Shared Channel (PUSCH), an Uplink Control Channel (PUCCH), a Random Access Channel (PRACH), and the like, which are Shared by the user terminals 20, are used. User data, higher layer control information, etc. are transmitted through the PUSCH. In addition, downlink radio Quality information (CQI: Channel Quality Indicator), acknowledgement information, Scheduling Request (SR), and the like are transmitted through the PUCCH. Through the PRACH, a random access preamble for establishing a connection with a cell is transmitted.

In the wireless communication system 1, as downlink Reference signals, Cell-specific Reference signals (CRS), Channel State Information Reference signals (CSI-RS), DeModulation Reference signals (DMRS), Positioning Reference Signals (PRS), and the like are transmitted. In addition, in the wireless communication system 1, as the uplink Reference Signal, a Sounding Reference Signal (SRS), a demodulation Reference Signal (DMRS), and the like are transmitted. In addition, the DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal). Further, the reference signals transmitted are not limited to these.

(radio base station)

Fig. 12 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment. The radio base station 10 includes a plurality of transmission/reception antennas 101, an amplifier unit 102, a transmission/reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission line interface 106. The number of the transmission/reception antenna 101, the amplifier unit 102, and the transmission/reception unit 103 may be one or more.

User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the upper station apparatus 30 to the baseband signal processing unit 104 via the transmission line interface 106.

In baseband signal processing section 104, with respect to user Data, transmission processes such as a process of a PDCP (Packet Data Convergence Protocol) layer, a process of dividing and combining user Data, a transmission process of an RLC layer such as an RLC (Radio Link Control) retransmission Control, an MAC (Medium Access Control) retransmission Control (for example, a transmission process of HARQ), a scheduling, a transport format selection, a channel coding, an Inverse Fast Fourier Transform (IFFT) process, and a precoding process are performed, and the user Data is transferred to transmitting/receiving section 103. Also, the downlink control signal is subjected to transmission processing such as channel coding and inverse fast fourier transform, and transferred to transmission/reception section 103.

Transmission/reception section 103 converts the baseband signal output from baseband signal processing section 104 by precoding for each antenna to the radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission/reception section 103 is amplified by the amplifier section 102 and transmitted from the transmission/reception antenna 101. The transmitting/receiving section 103 can be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present disclosure. The transmission/reception section 103 may be configured as an integrated transmission/reception section, or may be configured by a transmission section and a reception section.

On the other hand, for the uplink signal, the radio frequency signal received by the transmission/reception antenna 101 is amplified by the amplifier unit 102. Transmission/reception section 103 receives the uplink signal amplified by amplifier section 102. Transmitting/receiving section 103 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 104.

The baseband signal processing section 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction decoding, reception processing for MAC retransmission control, and reception processing for the RLC layer and the PDCP layer on the user data included in the input uplink signal, and transfers the user data to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, and the like) of a communication channel, state management of the radio base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the upper station apparatus 30 via a predetermined interface. The transmission path Interface 106 may also transmit/receive (backhaul signaling) signals to/from other Radio base stations 10 via an inter-base station Interface (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), X2 Interface).

Fig. 13 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment. In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be provided in the radio base station 10 as well as other functional blocks necessary for radio communication.

The baseband signal processing section 104 includes at least a control section (scheduler) 301, a transmission signal generation section 302, a mapping section 303, a reception signal processing section 304, and a measurement section 305. These components may be included in radio base station 10, or a part or all of the components may not be included in baseband signal processing section 104.

The control unit (scheduler) 301 performs overall control of the radio base station 10. The control unit 301 may be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present invention.

The control unit 301 controls, for example, generation of a signal in the transmission signal generation unit 302, allocation of a signal in the mapping unit 303, and the like. Further, the control unit 301 controls reception processing of signals in the received signal processing unit 304, measurement of signals in the measurement unit 305, and the like.

Control section 301 controls scheduling (e.g., resource allocation) of system information, a downlink data signal (e.g., a signal transmitted using a downlink shared channel), and a downlink control signal (e.g., a signal transmitted using a downlink control channel). The control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on the result of determining whether retransmission control of an uplink data signal is necessary, and the like.

Control section 301 controls scheduling of Synchronization signals (e.g., Primary Synchronization Signal/SSS (Secondary Synchronization Signal)), downlink reference signals (e.g., CRS, CSI-RS, DMRS), and the like.

Control section 301 controls scheduling of an uplink data signal (for example, a signal transmitted using an uplink shared channel), an uplink control signal (for example, a signal transmitted using an uplink control channel), a random access preamble, an uplink reference signal, and the like.

Transmission signal generating section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, and the like) based on an instruction from control section 301, and outputs the downlink signal to mapping section 303. The transmission signal generating unit 302 can be configured by a signal generator, a signal generating circuit, or a signal generating device described based on common knowledge in the technical field of the present invention.

Transmission signal generating section 302 generates at least one of DL assignment (assignment) for notifying assignment information of downlink data and UL grant (grant) for notifying assignment information of uplink data, for example, based on an instruction from control section 301. Both DL allocation and UL grant are DCI, and comply with DCI format. The downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on Channel State Information (CSI) and the like from each user terminal 20.

Mapping section 303 maps the downlink signal generated by transmission signal generating section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs the result to transmitting/receiving section 103. The mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field related to the present disclosure.

Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmitting/receiving section 103. Here, the reception signal is, for example, an uplink signal (an uplink control signal, an uplink data signal, an uplink reference signal, or the like) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present disclosure.

The received signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, the HARQ-ACK is output to control section 301. Further, the received signal processing unit 304 outputs at least one of the received signal and the reception-processed signal to the measurement unit 305.

The measurement unit 305 performs measurements related to the received signal. The measurement unit 305 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, and the like based on the received signal. Measurement section 305 may measure reception Power (for example, Reference Signal Received Power (RSRP)), 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, and the measurement result may be output to control section 301.

Furthermore, transmitting/receiving section 103 may transmit setting Information (for example, at least one of CSI-MeasConfig Information Element (IE) of RRC, CSI-ResourceConfig IE, CSI-reportconfige, and the like) related to measurement (or measurement report or report) for Channel State Information (CSI: Channel State Information) to user terminal 20. Transmission/reception section 103 may also receive CSI transmitted from user terminal 20.

Furthermore, the transmission reception unit 103 may also transmit at least one setting Information (for example, at least one of CSI-MeasConfig Information Element (IE) of RRC, CSI-resourceconfigie, CSI-reportconfigie, and the like) related to measurement (or measurement report or report) for Channel State Information (CSI: Channel State Information) to the user terminal 20.

Further, transmission/reception section 103 may receive at least one of the plurality of Channel State Information (CSI) reports corresponding to the plurality of transmission points, which are transmitted based on the at least one piece of setting information.

(user terminal)

Fig. 14 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment. The user terminal 20 includes a plurality of transmission/reception antennas 201, an amplifier unit 202, a transmission/reception unit 203, a baseband signal processing unit 204, and an application unit 205. The number of the transmission/reception antenna 201, the amplifier unit 202, and the transmission/reception unit 203 may be one or more.

The radio frequency signal received by the transmission and reception antenna 201 is amplified by the amplifier unit 202. Transmission/reception section 203 receives the downlink signal amplified by amplifier section 202. Transmitting/receiving section 203 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 204. The transmitting/receiving section 203 can be constituted by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present invention. The transmission/reception section 203 may be configured as an integrated transmission/reception section, or may be configured by a transmission section and a reception section.

The baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing of retransmission control, and the like on the input baseband signal. The downlink user data is forwarded to the application unit 205. The application section 205 performs processing and the like relating to layers higher than the physical layer and the MAC layer. Furthermore, the broadcast information among the data, which may also be downlink, is also forwarded to the application unit 205.

On the other hand, uplink user data is input from the application section 205 to the baseband signal processing section 204. Baseband signal processing section 204 performs transmission processing for retransmission control (e.g., transmission processing for HARQ), channel coding, precoding, Discrete Fourier Transform (DFT) processing, IFFT processing, and the like, and transfers the result to transmitting/receiving section 203.

Transmission/reception section 203 converts the baseband signal output from baseband signal processing section 204 into a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission/reception section 203 is amplified by the amplifier section 202 and transmitted from the transmission/reception antenna 201.

Fig. 15 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment. In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be provided in addition to other functional blocks necessary for wireless communication in the user terminal 20.

The baseband signal processing section 204 included in the user terminal 20 includes at least a control section 401, a transmission signal generation section 402, a mapping section 403, a received signal processing section 404, and a measurement section 405. These components may be included in the user terminal 20, or a part or all of the components may not be included in the baseband signal processing section 204.

The control unit 401 performs overall control of the user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present disclosure.

Control section 401 controls generation of a signal in transmission signal generation section 402, allocation of a signal in mapping section 403, and the like, for example. Further, the control unit 401 controls reception processing of signals in the received signal processing unit 404, measurement of signals in the measurement unit 405, and the like.

Control section 401 acquires a downlink control signal, a downlink data signal, and the like transmitted from radio base station 10 from received signal processing section 404. Control section 401 controls generation of an uplink control signal, an uplink data signal, and the like based on a result of necessity or non-necessity of retransmission control for a downlink data signal, a downlink control signal, and the like.

When various information notified from radio base station 10 is acquired from received signal processing unit 404, control section 401 may update parameters for control based on the information.

Transmission signal generating section 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, and the like) based on an instruction from control section 401, and outputs the uplink signal to mapping section 403. Transmission signal generating section 402 can be configured by a signal generator, a signal generating circuit, or a signal generating device described based on common knowledge in the technical field of the present invention.

Transmission signal generating section 402 generates an uplink control signal related to transmission acknowledgement information, Channel State Information (CSI), and the like, for example, based on an instruction from control section 401. Transmission signal generation section 402 also generates an uplink data signal based on an instruction from control section 401. For example, when the UL grant is included in the downlink control signal notified from radio base station 10, transmission signal generating section 402 is instructed from control section 401 to generate the uplink data signal.

Mapping section 403 maps the uplink signal generated by transmission signal generating section 402 to a radio resource based on an instruction from control section 401, and outputs the result to transmitting/receiving section 203. Mapping section 403 can be constituted by a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field of the present invention.

Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 203. Here, the reception signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, and the like) transmitted from the radio base station 10. The reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present disclosure. Further, the received signal processing unit 404 can constitute a receiving unit according to the present disclosure.

The received signal processing unit 404 outputs information decoded by the reception processing to the control unit 401. Received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to control section 401. Further, the received signal processing unit 404 outputs at least one of the received signal and the reception-processed signal to the measurement unit 405.

The measurement unit 405 performs measurements related to the received signal. The measurement unit 405 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present disclosure. The measurement portion 405 may also constitute at least a part of the receiving unit in the present disclosure.

For example, measurement section 405 may perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 405 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 so on. The measurement result may also be output to the control unit 401.

Furthermore, transmit receive unit 203 may also receive configuration Information (e.g., at least one of CSI-MeasConfig Information Element (IE: Information Element), CSI-ResourceConfig IE, CSI-reportConfig IE, etc. of RRC) related to at least one configuration Information (measurement (or measurement report or report) for Channel State Information). The measurement unit 405 may also perform measurement based on the setting information.

Further, control section 401 may determine a plurality of Channel State Information (CSI) reports corresponding to a plurality of transmission points (e.g., TRP, panel) based on the at least one piece of setting information.

Furthermore, transmitting/receiving section 203 may receive one piece of setting information including: the first parameter (for example, at least one of a channel measurement resource and an interference measurement resource) common to the plurality of transmission points, and the second parameter (first mode) dedicated to the plurality of transmission points.

The second parameter may indicate at least one of a resource for interference measurement, a report amount, and a report structure type.

Further, transmission/reception section 203 may receive a plurality of pieces of setting information corresponding to the plurality of transmission points, respectively. The first CSI report corresponding to the first transmission point may also depend on the second CSI report corresponding to the second transmission point (second manner).

The first CSI report may be a difference between a parameter corresponding to the first transmission point and a parameter corresponding to the second transmission point (option 1 of the second aspect). In addition, the second CSI report may include a parameter common to the first transmission point and the second transmission point (option 2 of the second embodiment).

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks in functional units. These functional blocks (structural units) are realized by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one physically or logically combined device, or may be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, by wire or wireless) and using these multiple devices.

For example, the radio base station, the user terminal, and the like according to one embodiment of the present disclosure may also function as a computer that performs processing of the radio communication method of the present disclosure. Fig. 16 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment. The radio base station 10 and the user terminal 20 described above may be configured as a computer device physically including the processor 1001, the memory 1002, the storage 1003, the communication device 1004, the input device 1005, the output device 1006, the bus 1007, and the like.

In the following description, the language "means" may be replaced with a circuit, a device, a unit, or the like. The hardware configuration of the radio base station 10 and the user terminal 20 may include one or more of the illustrated devices, 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 1 processor, or the processing may be executed by 2 or more processors simultaneously, sequentially, or by another method. The processor 1001 may be mounted on 1 or more chips.

Each function in the radio base station 10 and the user terminal 20 is realized by, for example, reading predetermined software (program) into hardware such as the processor 1001 and the memory 1002, whereby the processor 1001 performs an operation 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 a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the baseband signal processing unit 104(204), the call processing unit 105, 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 memory 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with the read program. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 401 of the user terminal 20 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 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), or the like. 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 the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be configured by at least one of a flexible disk, a Floppy (registered trademark) disk, an optical magnetic disk (e.g., a compact Disc (CD-rom), a digital versatile Disc, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key driver), a magnetic stripe, a database, a server, and other appropriate 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. Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, for example, in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the transmission/ reception antennas 101 and 201, the amplifier units 102 and 202, the transmission/ reception units 103 and 203, the transmission line interface 106, and the like described above may be realized by the communication device 1004.

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, an LED (Light Emitting Diode) 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 using a single bus, or may be configured using different buses for each device.

The radio base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), 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 installed using at least one of these hardware.

(modification example)

In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Further, the signal may also be a message. The reference signal may also be referred to as rs (reference signal) for short, and may also be referred to as Pilot (Pilot), Pilot signal, or the like according to the applied standard. Further, a Component Carrier (CC) may also be referred to as a cell, a frequency Carrier, a Carrier frequency, and the like.

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

Here, the parameter set (Numerology) may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may also indicate, for example, 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 slot may be formed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, or the like) in the time domain. In addition, the time slot may also be a time unit based on a parameter set (Numerology).

A timeslot 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. PDSCH (or PUSCH) transmitted in a time unit greater than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type a. 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 be referred to by other names respectively corresponding thereto. 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, 1 subframe may also be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini-slot may also be referred to as TTIs. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1-13 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, and is not referred to as 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 radio base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like that can be used 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 a transport block, a code block, a codeword, and the like are actually mapped may be shorter than the TTI.

In addition, when 1 slot or 1 mini-slot is referred to as TTI, 1 TTI or more (i.e., 1 slot or more or 1 mini-slot) 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.

The TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal 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, etc.) 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 a plurality of continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set (Numerology), and may also be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

The RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of 1 TTI and 1 subframe may be configured by one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB peers, and so on.

In addition, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

The Bandwidth Part (BWP: Bandwidth Part) (which may also be referred to as partial Bandwidth, etc.) may also represent a subset of consecutive common resource blocks (common resource blocks) for a certain parameter set (Numerology) 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. A PRB may be defined by a certain BWP and assigned a sequence number within the BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). It is also possible to set 1 or more BWPs for the UE within 1 carrier.

At least one of the set BWPs may be active, or the UE may not expect to transceive a predetermined signal/channel outside the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced by "BWP".

The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the 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, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations may be variously changed.

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

The names used in this disclosure for parameters and the like are not limiting names in any way. Further, the equations and the like using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), and the like) and information elements can be identified by all suitable names, and thus various names assigned to these various channels and information elements are not limitative names at any point.

Information, signals, etc. described in this disclosure may also be represented using one 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.

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

The information, signals, and the like that are input/output may be stored in a specific location (for example, a memory) or may be managed using a management table. The information, signals, and the like to be input and output can be overwritten, updated, or written in addition. The information, signals, etc. that are output may also be deleted. The input information, signal, and the like may be transmitted to another device.

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

In addition, physical Layer signaling may also be referred to as L1/L2 (Layer1/Layer 2(Layer1/Layer2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. Further, the MAC signaling may be notified using a MAC Control Element (MAC CE (Control Element)), for example.

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

The determination may be performed by a value (0 or 1) expressed by 1 bit, by a true-false value (boolean value) expressed by true (true) or false (false), or by a comparison of numerical values (for example, a comparison with a predetermined value).

Software shall be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects (objects), executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names.

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

The terms "system" and "network" as used in this disclosure can be used interchangeably.

In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location", "transmission power", "phase rotation", "antenna port group", "layer", "rank", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, "Base Station (BS)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "enodeb (enb)", "gbnodeb (gnb)", "access Point (access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Reception Point (TRP: Transmission/Reception)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" and the like can be used interchangeably. A base station is also sometimes referred to by the terms macrocell, smallcell, femtocell, picocell, and the like.

The base station can accommodate one or more (e.g., three) cells. In the case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole 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 (RRH): Remote Radio Head) — "cell" or "sector" which term refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that performs a communication service in the coverage area.

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

A mobile station is sometimes 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 appropriate terms.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, 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 (e.g., a vehicle, an airplane, etc.), an unmanned moving body (e.g., an unmanned aerial vehicle, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation.

In addition, the radio base station in the present disclosure may also be replaced with a user terminal. For example, the embodiments and implementation modes of the present disclosure may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (for example, D2D (Device-to-Device), V2X (Vehicle-to-Vehicle), and the like may be used). In this case, the user terminal 20 may have the functions of the radio base station 10 described above. The language such as "uplink" and "downlink" may be replaced with a language (e.g., "side") corresponding to inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

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

In the present disclosure, it is assumed that the operation performed by the base station is also performed by its upper node (upper node) depending on the case. In a network including one or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering MME (Mobility Management Entity), S-GW (Serving-Gateway), 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 switched to use with execution. Note that the order of the processing procedures, sequences, flowcharts, and the like of the respective modes/embodiments described in the present disclosure may be changed as long as there is no contradiction. For example, elements of various steps are presented in an exemplary order for the method described in the present disclosure, and the present invention is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER3G, IMT-Advanced, 4G (4th generation Mobile communication System, fourth generation Mobile communication System), 5G (5th generation Mobile communication System, fifth generation Mobile communication System), FRA (Future Radio Access), New-RAT (Radio Access Technology ), NR (New Radio), NX (New Radio Access), FX (Future Radio Access), GSM (Global System for Mobile communication, wireless telecommunications), IEEE (Mobile telecommunications System, Mobile telecommunications) 802, Radio Access, Broadband wireless telecommunications, Broadband wireless, IEEE 802.16(WiMAX (registered trademark)), IEEE802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate wireless communication method, a next generation system extended based on them, and the like. In addition, a combination of a plurality of systems (for example, a combination of LTE, LTE-a, and 5G) may be applied.

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

Any reference to an element using the designations "first," "second," etc. used in this disclosure is not intended to limit the amount or order of such elements in their entirety. These designations can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not imply that only two elements can be employed or that the first element must precede the second element in some fashion.

The term "determining" used in the present disclosure sometimes includes various operations. For example, "determining" may be considered as "determining" a determination (e.g., a determination), a calculation (calculating), a processing (processing), a derivation (deriving), an investigation (investigating), a search (logging) (e.g., a search in a table, a database, or another data structure), a confirmation (authenticating), or the like.

The term "determination (decision)" may be also referred to as "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like.

The "determination (decision)" may be regarded as "determination (decision)" performed for solving (resolving), selecting (selecting), selecting (breathing), establishing (evaluating), comparing (comparing), and the like. That is, "judgment (decision)" may also be regarded as "judgment (decision)" performed on some operation.

The "determination (decision)" may be replaced with "assumption", "expectation", "consideration", and the like.

The "maximum transmission power" described in the present disclosure may indicate a maximum value of transmission power, may indicate a nominal maximum transmission power (the nominal UE maximum transmission power), or may indicate a nominal maximum transmission power (the rated UE maximum transmission power).

The term "connected" or "coupled" or any variant thereof used in the present disclosure means all direct or indirect connections or couplings between 2 or more elements, and can include 1 or more intermediate elements between two elements that are "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 "accessed".

In the present disclosure, when two elements are connected, it is possible to consider that 1 or more electric wires, cables, printed electric connections, and the like are used, and as some non-limiting and non-inclusive examples, electromagnetic energy having a wavelength in a radio frequency domain, a microwave domain, a light (both visible and invisible) domain, and the like are used, and are "connected" or "coupled" to each other.

In the present disclosure, the term "a and B are different" may also mean "a and B are different from each other". Furthermore, the term may also mean "a and B are different from C, respectively". The terms "separate", "join", and the like are also to be construed as similar to "different". In the present disclosure, when the terms "including", and variations thereof are used, these terms are meant to be inclusive in the same way as the term "comprising". Further, the term "or" as used in this disclosure means not 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, it is also possible to include a meaning in which nouns following these articles are plural.

While the invention according to the present disclosure has been described in detail, 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 a modification and a variation without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for the purpose of illustration, and the invention according to the present disclosure is not intended to be limited in any way.

Claims (6)

1. A user terminal, comprising:

a receiving unit that receives at least one setting information; and

and a control unit configured to determine, based on the at least one piece of setting information, a plurality of Channel State Information (CSI) reports corresponding to the plurality of transmission points, respectively.

2. The user terminal of claim 1,

the receiving unit receives one setting information including a first parameter common to the plurality of transmission points and a second parameter dedicated to the plurality of transmission points.

3. The user terminal of claim 2,

the second parameter represents at least one of a resource for interference measurement, a report amount, and a report structure type.

4. The user terminal of claim 1,

the receiving unit receives a plurality of setting information corresponding to the plurality of transmission points,

the first CSI report corresponding to the first transmission point is dependent on the second CSI report corresponding to the second transmission point.

5. The user terminal of claim 4,

the first CSI report is a difference between a parameter corresponding to the first transmission point and a parameter corresponding to the second transmission point, or the second CSI report includes a parameter common to the first transmission point and the second transmission point.

6. A wireless base station, comprising:

a transmitting unit that transmits at least one setting information; and

a receiving unit that receives at least one of the plurality of Channel State Information (CSI) reports corresponding to the plurality of transmission points, which is transmitted based on the at least one setting information.

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