JP7504982B2 - Terminal, wireless communication method, base station and system - Google Patents

Description

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

Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and greater sophistication over LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

Successor systems to LTE (also known as, for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

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 NR Rel. 17 and later, it is being considered to expand area coverage by using distributed MIMO (Multi Input Multi Output) using millimeter waves (mmWave) in communications between user terminals (user equipment (UE)) and networks (NW, e.g., base stations).

In distributed MIMO technology, which is being considered for adoption in Rel. 17 and later, the method of controlling UEs communicating with the network has not yet been studied. If this control is not clarified, there is a risk that the increase in communication throughput will be suppressed.

Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method , a base station , and a system that can appropriately perform communication even when utilizing distributed MIMO technology.

A terminal according to one aspect of the present disclosure has a receiving unit that receives a first configuration for a first channel state information reference signal ( CSI -RS) resource corresponding to a first plurality of antenna ports and a second configuration for a second CSI-RS resource corresponding to a second plurality of antenna ports, with different transmission/reception points (TRPs) corresponding to the first plurality of antenna ports and the second plurality of antenna ports, respectively, and a control unit that controls measurements in the first CSI-RS resource based on the first configuration and controls measurements in the second CSI-RS resource based on the second configuration .

According to one aspect of the present disclosure, communication can be carried out appropriately even when utilizing distributed MIMO technology.

FIG. 1 is a diagram showing an example of an SFN in a tunnel. 2A and 2B are diagrams showing an example of arranging multiple antennas or multiple TRPs around a base station. 3A and 3B are diagrams showing an example of the configuration of antennas arranged around a base station. FIG. 4 is a diagram showing an example of communication using antenna configuration (1). FIG. 5 is a diagram showing an example of communication using antenna configuration (2). 6A and 6B are diagrams showing an example of communication using antenna configuration (2). 7A and 7B are diagrams showing an example of association between antenna points and antenna groups. 8A and 8B are diagrams showing an example of association between antenna points and antenna groups. FIG. 9 is a diagram showing an example of association between antenna points, antenna ports, and antenna groups. FIG. 10 is a diagram showing an example of a beam management method for multiple antenna points. FIG. 11 is a diagram showing an example of a beam management method for a plurality of antenna points. FIG. 12 is a diagram showing an example of a beam management method for a plurality of antenna points. FIG. 13 is a diagram showing an example of a beam management method for a plurality of antenna points. FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 15 is a diagram illustrating an example of the configuration of a base station according to an embodiment. FIG. 16 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. FIG. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.

In successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), New Radio (NR)), wireless communication methods using millimeter waves have been introduced. In Rel. 15 NR, hybrid beamforming (e.g., Beam Management) using Massive MIMO has been introduced, and in Rel. 16 NR, distributed MIMO (multi-TRP) has been introduced to improve the communication speed and reliability of the downlink shared channel (PDSCH).

In NR Rel. 17 and later, it is expected that the communication speed and reliability of channels other than the downlink shared channel (PDSCH) will be improved by distributed MIMO (multi-TRP). In addition, in NR Rel. 17 and later, it is expected that beam management will be improved in scenarios using moving objects such as trains (HTS (High Speed Train)) that move at high speed.

However, the above improvements in communication speed and reliability are on a best-effort basis and are only applicable to limited areas.

In successor systems to NR (e.g., also referred to as 5G+, 6G, etc.), higher data rates/capacity, wide-area coverage, low energy/cost, low latency, high reliability, multiple connections, etc. are required compared to 5G. In this disclosure, "A/B" may mean "at least one of A and B."

In line with the above 6G requirements, it is expected that best-effort communications will be replaced by quality-guaranteed communications. It is also expected that high-speed, highly reliable communications will be expanded from limited areas to all areas.

There are several issues with wireless communication methods that use millimeter waves. For example, there are concerns about increased propagation loss due to increased communication distances, increased non-line of sight loss due to the highly directional nature of radio waves, the difficulty of implementing high-order SU-MIMO (Single User MIMO) due to the lack of multipath, and the need to increase the installation density of equipment due to its larger size.

In the LTE system, a Single Frequency Network (SFN) is operated using multiple small antennas in a structure (e.g., a tunnel, a building, etc.) with the same cell ID for each antenna. SFN is a method of transmitting the same signal simultaneously in the same physical resource block (PRB) using multiple antennas, and a UE receiving a signal assumes that the signal was transmitted from a single point.

Figure 1 is a diagram showing an example of an SFN in a tunnel. In Figure 1, for example, a large antenna is installed outside the tunnel (for example, near the tunnel entrance), and a small antenna is installed inside the tunnel. The large antenna may be, for example, an antenna with a transmission power of about 1-5W. The small antenna may be, for example, an antenna with a transmission power of about 250mW. The large antenna may transmit downlink (DL) signals inside and outside the tunnel, and the small antenna may transmit DL signals into the tunnel. The large antenna may perform handover before the UE enters the tunnel. The large antenna and the small antenna in Figure 1 may transmit the same DL signal to one UE at the same time in the same PRB. Note that the arrangement and transmission power of each antenna in Figure 1 are merely examples and are not limited to this example. In addition, the SFN in the tunnel may be read as IMCS (Inbuilding Mobile Communication System).

In this disclosure, "transmission of a DL signal at an antenna" may be read as "reception of an uplink (UL) signal at an antenna." Also, "reception of a DL signal at a UE" may be read as "transmission of a UL signal at a UE."

In order to expand the coverage area using distributed MIMO with millimeter waves, a method of spreading out a large number of antenna points is being considered. For example, as shown in Figure 2A, a method of securing a high-speed, high-reliability area may be achieved by spreading out multiple high-frequency antennas with relatively narrow coverage from a low-frequency base station with relatively wide coverage.

In this disclosure, a low-frequency base station with a relatively wide coverage may simply be referred to as a base station. Also, a high-frequency antenna with a relatively narrow coverage may simply be referred to as an antenna.

The multiple antennas may be installed and operated not only outdoors but also indoors on ceilings/walls. For example, they may be installed near indoor lighting sources. In this case, there is a high possibility that the antennas will be within line of sight of multiple indoor UEs, and it is possible to reduce propagation loss.

Figure 2A shows an example of arranging multiple antennas around a base station. For example, the method of spreading antenna points as shown in Figure 2A can be implemented at low cost, but it is difficult to optimize resource utilization efficiency, and there are problems with increasing propagation loss as the distance of the high-frequency antenna increases.

On the other hand, in order to expand the service area by utilizing distributed MIMO using millimeter waves, a method is being considered in which part of the base station functions are extended to the vicinity of the high-frequency antenna. This method is similar to the method of placing multiple transmission/reception points (TRPs) around the base station.

Figure 2B is a diagram showing an example of arranging multiple TRPs around a base station. For example, the method of extending multiple TRPs around a base station as shown in Figure 2B allows resource control for each TRP, and even if the distance between TRPs increases, propagation loss can be reduced by utilizing optical fiber, etc.

In this disclosure, an "antenna point" may mean an "antenna corresponding to (corresponding to) a physical antenna element" or an "antenna corresponding to (corresponding to) multiple physical antenna elements." An antenna port may mean an "antenna of a signal processing unit consisting of one or more antenna points," a "signal processing unit corresponding to one or more antenna points," a "logical entity corresponding to a signal output from one or more antenna points," or the like. An "antenna group" may mean "multiple antennas consisting of one or more antenna points," or "multiple antennas consisting of one or more antenna ports."

In addition, in the present disclosure, "antenna point" may be read interchangeably as "antenna end," "antenna port," "antenna group," "antenna element," "antenna position," "high frequency antenna point," "high frequency antenna end," "high frequency antenna port," "high frequency antenna group," "high frequency antenna element," "high frequency antenna position," etc.

In addition, in this disclosure, "antenna group" may be read interchangeably as "antenna group," "antenna set," "high frequency antenna group," "high frequency antenna group," "high frequency antenna set," etc.

Two configurations are being considered as a method of deploying a large number of antenna points to expand coverage area using distributed MIMO with millimeter waves.

One configuration under consideration is one in which high-frequency antennas are connected by electric wires or the like and extended continuously in a certain direction, as shown in Figure 3A (antenna configuration (1)). With this antenna configuration, the cost of construction can be kept low, but it is thought that antenna loss will increase the closer the antenna is to the base station, the farther it is from the base station.

Another configuration under consideration is one in which signals are relayed to some antennas (e.g., using optical fiber, IAB, etc.) as shown in Figure 3B (antenna configuration (2)). With this antenna configuration, it is possible to reduce antenna loss even for antennas that are relatively far from the base station.

In the case of antenna configuration (1), the same signal may be transmitted from all antenna points. If a UE is located near any of the multiple high frequency antenna points, DL communication is possible for the UE. In this case, the NW does not need to recognize which antenna the UE is located near, so overhead can be reduced. However, transmitting the same transmission signal from all antenna points reduces the spatial frequency utilization efficiency.

Figure 4 is a diagram showing an example of communication using antenna configuration (1). In Figure 4, a DL signal is transmitted from the high frequency antenna to UE1. In this case, UE1 in the vicinity of the high frequency antenna can communicate. The contribution of the transmission signal to UE1 from the high frequency antenna, which is relatively far from the base station, to improving the received signal at UE1 is small. Therefore, it is preferable to utilize frequency resources for UE2 and other UEs in the vicinity of the high frequency antenna.

In order to solve the problem of the above antenna configuration (1), it is conceivable to divide a series of antenna points into multiple antenna points, provide an antenna group consisting of multiple consecutive antenna points, and transmit an independent transmission signal for each antenna group.

Figure 5 is a diagram showing an example of communication using antenna configuration (2). For example, as shown in Figure 5, if antenna points (antenna points #1-#4) relatively close to the base station are set as a first antenna group, and antenna points (antenna points #5-#8) relatively far from the base station are set as a second antenna group, then UE1 near the first antenna group and UE2 near the second antenna group can communicate with the NW appropriately.

In addition, in the configuration of the example in Figure 5, the base station may have the function of scheduling for each antenna group and relay for each antenna group (for example, relaying by extending optical fiber, etc.), or each antenna group may have some of the functions of a base station.

In antenna configuration (2), the same DL signal/reference signal (RS) may be transmitted from each antenna group. Also, in antenna configuration (2), the same (common) DL signal/RS may be transmitted from some antenna groups, and a different DL signal/RS may be transmitted from another antenna group.

6A and 6B are diagrams showing an example of communication using antenna configuration (2). In Fig. 6A, a common DL signal is transmitted to UE1 and UE2 from the first antenna group and the second antenna group. Meanwhile, in Fig. 6B, DL signal 1 is transmitted to UE1 from the first antenna group, and DL signal 2 is transmitted to UE2 from the second antenna group.

(TCI, spatial relations, QCL)
In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (hereinafter referred to as a signal/channel) based on a transmission configuration indication state (TCI state).

The TCI state may represent that which applies to the downlink signal/channel. The equivalent of the TCI state which applies to the uplink signal/channel may be expressed as a spatial relation.

The TCI state is information about the Quasi-Co-Location (QCL) of signals/channels and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE on a per channel or per signal basis.

In addition, in this disclosure, the DL TCI state may be interpreted interchangeably as the UL spatial relationship, the UL TCI state, etc.

QCL is an index that indicates the statistical properties of a signal/channel. For example, if a signal/channel has a QCL relationship with another signal/channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) is the same between these different signals/channels (QCL with respect to at least one of these).

In addition, the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL. The QCL (or at least one element of the QCL) in this disclosure may be read as sQCL (spatial QCL).

A plurality of types (QCL types) of QCL may be defined. For example, four QCL types A to D may be provided, each of which has different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be called QCL parameters) are as follows:
QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread,
QCL type B (QCL-B): Doppler shift and Doppler spread,
QCL type C (QCL-C): Doppler shift and mean delay;
QCL Type D (QCL-D): Spatial reception parameters.

The UE's assumption that a particular Control Resource Set (CORESET), channel or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel or reference signal may be referred to as a QCL assumption.

The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI condition or QCL assumption of the signal/channel.

The TCI state may be, for example, information regarding the QCL between the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.

In the present disclosure, higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

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

The physical layer signaling may be, for example, downlink control information (DCI).

The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).

In addition, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS/PBCH block.

The TCI state information element (RRC's "TCI-state IE") set by higher layer signaling may include one or more QCL information ("QCL-Info"). The QCL information may include at least one of information on the RS that is in a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may include information such as an index of the RS (e.g., an SSB index, a Non-Zero-Power (NZP) CSI-RS resource identifier), an index of the cell in which the RS is located, and an index of the Bandwidth Part (BWP) in which the RS is located.

In Rel. 15 NR, both QCL type A RS and QCL type D RS, or only QCL type A RS, may be configured for a UE as at least one TCI state of the PDCCH and PDSCH.

When a TRS is configured as an RS for QCL type A, unlike a demodulation reference signal (DMRS) for a PDCCH or PDSCH, it is assumed that the same TRS is transmitted periodically over a long period of time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

A UE in which the TRS is set as a QCL type A RS in the TCI state of the DMRS of the PDCCH or PDSCH can assume that the parameters of the QCL type A of the DMRS of the PDCCH or PDSCH and the TRS (average delay, delay spread, etc.) are the same, and can therefore obtain the parameters of the type A of the DMRS of the PDCCH or PDSCH (average delay, delay spread, etc.) from the measurement results of the TRS. When performing channel estimation of at least one of the PDCCH and PDSCH, the UE can perform more accurate channel estimation using the measurement results of the TRS.

A UE configured with a QCL type D RS can use the QCL type D RS to determine the UE receiving beam (spatial domain receiving filter, UE spatial domain receiving filter).

An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel/signal (DMRS), and this RS may be referred to as a QCL source of QCL type X in that TCI state.

(CSI)
In NR, a UE measures the channel state using a reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to a network (e.g., a base station).

The UE may measure the channel state using at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block, a Synchronization Signal (SS), a DeModulation Reference Signal (DMRS), etc.

The CSI-RS resources may include at least one of non-zero power (NZP) CSI-RS resources, zero power (ZP) CSI-RS resources, and CSI interference measurement (CSI-IM) resources.

The resources for measuring the signal components for CSI may be called Signal Measurement Resources (SMR) or Channel Measurement Resources (CMR). SMR (CMR) may include, for example, NZP CSI-RS resources, SSB, etc. for signal measurement.

The resource for measuring the interference component for CSI may be referred to as an interference measurement resource (IMR). The IMR may include, for example, at least one of an NZP CSI-RS resource, an SSB, a ZP CSI-RS resource, and a CSI-IM resource for interference measurement.

An SS/PBCH block is a block that includes a synchronization signal (e.g., a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS)) and a PBCH (and corresponding DMRS), and may be referred to as an SS block (SSB), etc.

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

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

In addition, CSI may be classified into several CSI types. The type and size of information to be reported may differ depending on the CSI type. For example, a CSI type set for communication using a single beam (also called type I CSI, CSI for single beam, etc.) and a CSI type set for communication using multiple beams (also called type II CSI, CSI for multiple beams, etc.) may be specified. The use of the CSI types is not limited to this.

Methods of CSI feedback under consideration include periodic CSI (Periodic CSI (P-CSI)) reporting, aperiodic CSI (A-CSI)) reporting, and semi-persistent CSI (Semi-Persistent CSI (SP-CSI)) reporting.

The UE may be notified of CSI measurement configuration information using higher layer signaling, physical layer signaling or a combination of these.

The CSI measurement configuration information may be configured, for example, using the RRC information element "CSI-MeasConfig". The CSI measurement configuration information may include CSI resource configuration information (RRC information element "CSI-ResourceConfig"), CSI report configuration information (RRC information element "CSI-ReportConfig"), etc. The CSI resource configuration information relates to resources for CSI measurements, and the CSI report configuration information relates to how the UE performs CSI reporting.

The CSI reporting configuration information ("CSI-ReportConfig") may include resource information for channel measurement ("resourcesForChannelMeasurement"). The CSI reporting configuration information may also include resource information for interference measurement (e.g., NZP CSI-RS resource information for interference measurement ("nzp-CSI-RS-ResourcesForInterference"), CSI-IM resource information for interference measurement ("csi-IM-ResourcesForInterference"), etc.). These pieces of resource information may correspond to the ID (Identifier) of the CSI resource configuration information ("CSI-ResourceConfigId").

In addition, the ID of the CSI resource setting information corresponding to each resource information (which may also be called a CSI resource setting ID) may be one or more of the same value, or may be different values.

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

The resource type indicates the time domain behavior of this CSI-RS resource configuration, and can be set to "aperiodic", "semi-persistent", or "periodic". The corresponding CSI-RS may be called A-CSI-RS, SP-CSI-RS, or P-CSI-RS.

In addition, the channel measurement resources may be used to calculate, for example, CQI, PMI, L1-RSRP, etc. In addition, the interference measurement resources may be used to calculate L1-SINR, L1-SNR, L1-RSRQ, and other interference-related indices.

When interference measurements are performed on CSI-IM, each CSI-RS for channel measurements may be associated with a CSI-IM resource from a resource perspective based on the order of the CSI-RS resources and the CSI-IM resources in the corresponding resource set.

The "nzp-CSI-RS-SSB" may include NZP CSI-RS resource set list information ("nzp-CSI-RS-ResourceSetList") and SSB resource set list information for CSI measurements ("csi-SSB-ResourceSetList"). These list information may correspond to one or more NZP CSI-RS resource set IDs ("NZP-CSI-RS-ResourceSetId") and CSI-SSB resource set IDs ("CSI-SSB-ResourceSetId"), respectively, and may be used to identify the resources to be measured.

The NZP CSI-RS resource set information ("NZP-CSI-RS-ResourceSet") may include an NZP CSI-RS resource set ID and one or more NZP CSI-RS resource IDs ("NZP-CSI-RS-ResourceIds").

The NZP CSI-RS resource information ("NZP-CSI-RS-Resource") may include an NZP CSI-RS resource ID and an ID ("TCI-stateId") of the transmission configuration indication state (TCI state). The TCI state is described below.

The CSI-SSB resource set information ("CSI-SSB-ResourceSet") may include a CSI-SSB resource set ID and one or more SSB index information ("SSB-Index"). The SSB index information may be, for example, an integer between 0 and 63, and may be used to identify an SSB within an SS burst.

The TCI state information ("TCI-State") may include a TCI state ID and one or more pieces of QCL information ("QCL-Info"). The QCL information may include at least one of information regarding a reference signal of the QCL source (RS related information ("referenceSignal")) and information indicating a QCL type (QCL type information ("qcl-Type")). The RS related information may include information such as an index of the RS (e.g., NZP CSI-RS resource ID, SSB index), an index of the serving cell, and an index of the BWP (Bandwidth Part) in which the RS is located.

The UE may control reception processing (e.g., at least one of reception, demapping, demodulation, decoding, receive beam determination, etc.), transmission processing (e.g., at least one of transmission, mapping, modulation, encoding, transmit beam determination, etc.) of the signal/channel based on the TCI state corresponding to the TCI state ID associated with the signal/channel.

For P-CSI-RS, the associated TCI state may be configured by RRC. For SP-CSI-RS, A-CSI-RS, the associated TCI state may be determined based on higher layer signaling, physical layer signaling, or a combination thereof.

(Beam Management)
In Rel. 15 NR, a method of Beam Management (BM) has been considered. In the beam management, beam selection is performed based on the L1-RSRP reported by the UE. Changing (switching) the beam of a certain signal/channel may correspond to changing the Transmission Configuration Indication state (TCI state) of the signal/channel.

The UE may report (transmit) the measurement results for beam management using the uplink control channel (Physical Uplink Control Channel (PUCCH)) or the uplink shared channel (Physical Uplink Shared Channel (PUSCH)). The measurement results may be, for example, CSI including at least one of L1-RSRP, L1-RSRQ, L1-SINR, L1-SNR, etc.

Measurement results (e.g., CSI) reported for beam management may be referred to as beam measurement, beam measurement report, beam report, beam report CSI, etc.

The CSI measurements for the beam report may include interference measurements. The UE may use resources for CSI measurements to measure channel quality, interference, etc., and derive the beam report.

The beam report may include at least one of the results of a channel quality measurement and an interference measurement. The channel quality measurement result may include, for example, L1-RSRP. The interference measurement result may include, for example, L1-SINR, L1-SNR, L1-RSRQ, or other interference-related indicators (for example, any indicator other than L1-RSRP).

The CSI reporting configuration information ("CSI-ReportConfig") may include a "report quantity" (which may be represented by the RRC parameter "reportQuantity"), which is information on parameters to be reported in one report instance (e.g., one CSI). The report quantity is defined by an ASN.1 (Abstract Syntax Notation One) object type called "choice". For this reason, one of the parameters (cri-RSRP, ssb-Index-RSRP, etc.) defined as the report quantity is set.

A UE in which higher layer parameters included in the CSI reporting configuration information (e.g., the RRC parameter "groupBasedBeamReporting") are set to enabled may include in the beam report, for each reporting configuration, multiple beam measurement resource IDs (e.g., SSBRI, CRI) and multiple corresponding measurement results (e.g., L1-RSRP).

A UE in which one or more numbers of RS resources to be reported have been configured by higher layer parameters (e.g., the RRC parameter "nrofReportedRS") included in the CSI reporting configuration information may include in the beam report one or more beam measurement resource IDs and one or more corresponding measurement results (e.g., L1-RSRP) for each reporting configuration.

In Rel. 15 NR, the cri-RSRP and ssb-Index-RSRP are related to beam management among the reporting quantities. A UE with a cri-RSRP configured reports a CRI and an L1-RSRP corresponding to the CRI. A UE with a ssb-Index-RSRP configured reports an SSBRI and an L1-RSRP corresponding to the CRI.

However, in the distributed MIMO technology that uses the above-mentioned antenna configuration and is being considered for adoption in Rel. 17 and later, the method of controlling UEs that communicate with the network has not yet been studied. Specifically, there has been insufficient study on the control method of UE beam management for multiple antennas. If this control is not clarified, there is a risk that the increase in communication throughput will be suppressed.

Therefore, the inventors have come up with a method of appropriate beam management for multiple antennas, even when using distributed MIMO technology utilizing the above antenna configuration.

Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Each embodiment may be applied alone or in combination.

(Wireless communication method)
First Embodiment
The present inventors came up with the idea of the first embodiment by noting that the physical distance between each antenna point in an antenna group is large and that a phase shift may occur in the signal at each antenna point.

A separate TCI state may be set for each antenna point. In other words, the UE may assume that a separate TCI state (e.g., a different TCI state) is set for each antenna point. In this disclosure, the TCI state may be interchangeably read as at least one of a DL TCI state, a UL TCI state, a unified TCI state, a spatial relationship, a QCL, a QCL assumption, and a QCL type.

For example, the UE may assume that the TCI state is set separately for each antenna point. That is, different TCI state settings may be supported for multiple antenna points. The UE may also assume that the TCI state is set separately for each (set of) multiple antenna points.

The UE may also assume that a specific QCL type (e.g., QCL type D) is set for each antenna group. For example, the UE may assume that at least a specific QCL type is the same between antenna points of the same Code Division Multiplexing (CDM) group (e.g., between antenna points that perform antenna point multiplexing in at least one of the code domain, the spatial domain, and the beam domain), and may receive a demodulation reference signal (DeModulation Reference Signal (DMRS)) corresponding to the CDM group. The UE may also assume that QCL types other than the specific type are different between antenna points of different CDM groups (e.g., between antenna points that perform antenna point multiplexing in at least one of the time domain and the frequency domain), and may receive a DMRS corresponding to the CDM group.

In the present disclosure, CDM group, group, CORESET, PDSCH, codeword, antenna port group (e.g., DMRS port group), reference signal group, CORESET group, etc. may be interchangeable. Also, antenna group and TRP may be interchangeable.

The TCI state (QCL) for the antenna points may be set by higher layer signaling (e.g., RRC signaling), physical layer signaling (e.g., DCI), or a combination thereof. For example, the QCL for one or more antenna points may be set semi-statically by RRC signaling. The QCL for one or more antenna points may be selected by the MAC CE from among those semi-statically set by RRC signaling. The QCL for one or more antenna points may be selected by the MAC CE from among those semi-statically set by RRC signaling, and may be further selected by the DCI from among those selected by the MAC CE.

According to the method of setting the TCI state (QCL) in the first embodiment described above, communication can be performed appropriately even when the physical distance between the antenna points is large.

In addition, at least one of the UE and the NW may perform signal processing (e.g., precoding, etc.) independently for each antenna point included in one antenna group. At least one of the UE and the NW is required to perform transmission and reception processing based on antenna points with different phases in the antenna group. For this purpose, it is preferable to grasp the channel state (including the phase difference) between the UE and each antenna point.

For example, the UE may transmit a UL Reference Signal (RS) (e.g., SRS), and the NW may measure Channel State Information (CSI) based on the reference signal. In this case, the NW can suitably measure the channel including the phase difference of each antenna point.

For example, when CSI measurement is performed by DL RS, the UE may perform CSI measurement based on a new CSI codebook that takes into account the phase difference of signals between antenna points. In other words, the UE may perform signal processing of DL signals received from each antenna point based on the newly defined codebook. For example, the UE may refer to a codebook for a single panel and perform CSI measurement for multiple panels, assuming that one panel corresponds to one antenna point. Note that the multiple panels may be non-coherent.

In the present disclosure, the CSI may be measured for each antenna point, for each antenna port, for each antenna group, or for each of multiple antenna groups.

According to the CSI measurement method in the first embodiment described above, appropriate communication can be performed taking into account the phase difference of each antenna point.

Second Embodiment
In the following, the association between an antenna point and an antenna group consisting of one or more antenna points will be described. The number of antenna points constituting the antenna group shown in the following description is merely an example, and is not limited to this.

The UE may assume that an antenna point is associated with an antenna group based on a certain rule. The rule may be specified in advance in a specification. For example, X antenna points (X is any natural number) may be defined as a unit of one antenna group, and X may be specified in a specification. For example, as shown in FIG. 7A, one antenna group may be configured for every four antenna points.

It may also be assumed that the UE associates antenna points with antenna groups (at least one of notification, configuration, update, activation, and deactivation) by higher layer signaling, physical layer signaling, or a combination of these. In this case, flexible communication control is possible according to the distribution of multiple UEs, traffic volume, etc.

For example, as shown in FIG. 7B, the association of antenna points with antenna groups may be updated by higher layer signaling, physical layer signaling, or a combination thereof.

In addition, the antenna points included in the antenna group do not have to be consecutive. For example, the UE may be notified of the antenna points included in the antenna group by a bitmap.

The antenna point numbers (ID, index) may be local numbers within each antenna group. For example, as in the example shown in FIG. 8A, the antenna point numbers (in this case, #0-#3) may be set in ascending order within each antenna group. The antenna point numbers may also be common to each antenna group. In this case, the numbers of multiple antenna points constituting different antenna groups may be common or different. For example, as in the example shown in FIG. 8B, the same antenna point number (in this case, #0) may be set.

Note that in this disclosure, ascending order may be interpreted as descending order.

In addition, an association between an antenna point corresponding to a physical antenna element (or a set of multiple physical antenna elements) and an antenna port of a signal processing unit may be set (or specified, indicated). For example, as shown in the example of FIG. 9, a number may be set that associates each antenna point included in the first and second antenna groups with an antenna port of a signal processing unit.

The association of antenna points, antenna ports and antenna groups may be explicitly signalled to the UE by higher layer signalling, physical layer signalling or a combination thereof.

For example, the association of antenna points, antenna ports and antenna groups may be notified to the UE by higher layer signaling (e.g., RRC signaling, MAC CE).

In addition, for the association of antenna points, antenna ports, and antenna groups, multiple associations may be notified to the UE by higher layer signaling (e.g., RRC signaling, MAC CE). The UE may determine one association from the multiple associations by DCI. The DCI may be a DCI that schedules a control channel/shared channel, and an indication field regarding the association of antenna points, antenna ports, and antenna groups may be specified. The size of the indication field may be Ceil(log ₂ (M)) bits. In this case, M may be the number of candidates notified to the UE by higher layer signaling (or the number of the above associations configured in the UE). Note that Ceil(X) in the present disclosure may mean a ceiling function of X.

The UE may also implicitly determine the association of antenna points, antenna ports and antenna groups.

For example, the UE may implicitly determine the association of antenna points, antenna ports, and antenna groups based on the physical resources of the DCI (or the PDCCH that transmits the DCI). The physical resources of the DCI may be at least one of the time resource, frequency resource, control channel element (CCE) index, search space index, control resource set (CORESET) index, and aggregation level of the DCI. For example, the UE may assume that the remainder of the CCE index value (or the aggregation level value, or the value obtained by dividing the CCE index by the aggregation level) by a certain integer is the value for the association of antenna points, antenna ports, and antenna groups instructed by the NW.

Also, for example, the UE may assume that the antenna points, antenna ports, and antenna groups of the data schedule by the DCI are determined based on the association of the antenna points, antenna ports, and antenna groups of the DCI. For example, the UE may assume that the association of the antenna points, antenna ports, and antenna groups of the DCI and the association of the antenna points, antenna ports, and antenna groups of the data schedule by the DCI are common. Also, for example, the UE may apply a conversion formula in the association of the antenna points, antenna ports, and antenna groups of the DCI to determine the association of the antenna points, antenna ports, and antenna groups of the data schedule by the DCI.

Also, for example, the UE may assume that the antenna points, antenna ports and antenna groups for the data schedule according to the DCI are determined based on the TCI state of the DCI (or the PDCCH that transmits the DCI).

In addition, the association between antenna points and antenna groups described in the second embodiment may be the same or different between the uplink and the downlink. In addition, the association may be set, activated, determined, etc. for each channel or reference signal, or may be set, activated, determined, etc. commonly for multiple channels/reference signals.

According to the second embodiment, the UE can perform appropriate communication based on the association of antenna points, antenna ports and antenna groups.

Third Embodiment
In this embodiment, the beam management of the UE and the NW for a plurality of antenna points constituting an antenna group will be described. A specific method will be described in the embodiments 3-1 to 3-4, but the embodiments 3-1 to 3-4 may be applied alone or in combination.

<Embodiment 3-1>
The UE may assume that beam management is performed independently for each antenna point. In this case, the UE may be configured with a certain number (e.g., N (N is any integer, e.g., 64)) of RS (e.g., at least one of CSI-RS, SSB, and SRS) resources for each antenna point. The UE may then perform measurements of the received power/received quality in the N RS resources configured for each antenna point. Furthermore, the UE may determine (decide) a spatial domain filter (analog beam) to be applied to receive (transmit) a signal/channel based on the results of the measurements.

Specifically, the UE measures the received power (e.g., Reference Signal Received Power (RSRP), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR))/received quality (e.g., Reference Signal Received Quality (RSRQ)) for N RS resources set for each antenna point based on information about the RS resources received from the network.

Next, the UE reports (transmits) at least one of the RS IDs with the highest received power (reception quality) or the measurement values to the NW.

The UE may then determine the TCI state (or spatial relationship) corresponding to that RS ID/measurement as the spatial domain filter to apply in receiving the DL channel/signal.

The UE may also receive information about a spatial domain filter to be applied in receiving a DL channel/signal from a NW and determine the spatial domain filter. The NW may be a NW that has received the reported RS ID/measurement value, or a NW that has not received the reported RS ID/measurement value.

In the third embodiment, the reception of DL channels/signals is described, but this embodiment is also applicable to the transmission of UL channels/signals. When this embodiment is applied to the transmission of UL channels/signals, the UE may determine that the spatial domain filter to be applied in the reception of DL channels/signals is the spatial domain filter to be applied in the transmission of UL channels/signals. In addition, the UE may receive measurement results corresponding to N RS resources measured by the NW, and determine the spatial domain filter to be applied in the transmission of UL channels/signals.

The number of RS resources N may be a common number for each antenna point or may be a different number. The spatial domain filter set for each antenna point may be a common number or may be different.

In the present disclosure, the N RS resources may be referred to as an RS resource set, an RS resource list, an RS resource group, etc. Also, the configuration of the N RS resources may be notified to the UE by higher layer signaling, physical layer signaling, or a combination thereof. Also, in the present disclosure, the measurement result of the received power/received quality in the RS resource may simply be read as the measurement result corresponding to the RS resource.

Figure 10 is a diagram showing an example of performing beam management independently for each antenna point. In Figure 10, antenna points #0 and #1 are included in a first antenna group, and antenna points #2 and #3 are included in a second antenna group. In this disclosure, the antenna points may be referred to as virtual antenna points, virtual antenna ports, pseudo antenna points, pseudo antenna ports, virtual RS points, virtual RS ports, pseudo RS points, pseudo RS ports, etc.

Note that the UE may assume that pseudo antenna points/ports (which may be referred to as virtual antenna points/ports) are constituted by the antenna points/ports actually used for MIMO transmission. The virtual antenna points/ports may include only antenna points/ports within an antenna group, or may include antenna points/ports across multiple antenna groups. Note that the virtual antenna points/ports for a certain multi-antenna transmission may constitute a virtual antenna group.

The UE and the NW may associate an antenna port with each antenna point in the antenna group. The network may notify the UE of information regarding the antenna points/ports actually used for MIMO transmission using higher layer signaling, physical layer signaling, or a combination of these.

In addition, a virtual antenna point/port may correspond to an antenna point/port that is activated based on higher layer signaling, physical layer signaling, or a combination of these.

In addition, each antenna point (or each virtual antenna point) in an antenna group (or virtual antenna group) may transmit the same data, or each may process the signal independently and transmit it.

In the example shown in Figure 10, N RS resources (SSB) are configured for each antenna point (antenna points #0-#3). In this case, the UE performs measurements for each antenna point in each of the RS resources and determines the spatial domain filter to apply to the channel/signal of the UE.

<Embodiment 3-2>
The UE may assume that beam management is performed independently for each antenna group. In this case, the UE may be configured with N RS resources for each antenna group. The UE may then perform measurements of received power/received quality in the N RS resources configured for each antenna group. Furthermore, the UE may determine (decide) a spatial domain filter to be applied to receive (transmit) a signal/channel based on the results of the measurements.

Specifically, the UE measures the received power/reception quality for N RS resources set for each antenna group based on information about RS resources received from the network.

Next, the UE reports (transmits) at least one of the RS IDs with the highest received power (reception quality) or the measurement values to the NW.

The UE may then determine the TCI state (or spatial relationship) corresponding to that RS ID/measurement as the spatial domain filter to apply in receiving the DL channel/signal.

The UE may also receive information about a spatial domain filter to be applied in receiving a DL channel/signal from a NW and determine the spatial domain filter. The NW may be a NW that has received the reported RS ID/measurement value, or a NW that has not received the reported RS ID/measurement value.

The number of RS resources N may be a common number for each antenna group or may be a different number. The spatial domain filters set for each antenna group may be common or may be different.

Figure 11 shows an example of performing beam management independently for each antenna group. The configuration of antenna points and antenna groups shown in Figure 11 is the same as that in Figure 10.

In the example shown in Figure 11, N RS resources (SSBs) are configured for each antenna group (first and second antenna groups). In this case, the UE performs measurements for each antenna group in each of the RS resources and determines the spatial domain filter to be applied to the channel/signal of the UE.

<Embodiment 3-3>
The UE may assume that beam management is performed independently for each of the multiple antenna groups. In this case, the UE may be configured with N RS resources for each of the multiple antenna groups. The UE may then measure the received power/received quality in the N RS resources configured for each of the multiple antenna groups. Furthermore, the UE may determine (decide) a spatial domain filter to be applied to receive (transmit) a signal/channel based on the result of the measurement.

Specifically, the UE measures the received power/reception quality for N RS resources set for each of multiple antenna groups based on information about RS resources received from the network.

Next, the UE reports (transmits) at least one of the RS IDs with the highest received power (reception quality) or the measurement values to the NW.

The UE may then determine the TCI state (or spatial relationship) corresponding to that RS ID/measurement as the spatial domain filter to apply in receiving the DL channel/signal.

The UE may also receive information about a spatial domain filter to be applied in receiving a DL channel/signal from a NW and determine the spatial domain filter. The NW may be a NW that has received the reported RS ID/measurement value, or a NW that has not received the reported RS ID/measurement value.

The number of RS resources N may be a common number for each of the multiple antenna groups, or may be a different number. The spatial domain filters set for each of the multiple antenna groups may be common or may be different.

Figure 12 shows an example of performing beam management independently for each of multiple antenna groups. The configuration of antenna points and antenna groups shown in Figure 12 is the same as that in Figure 10.

In the example shown in Figure 12, N RS resources (SSBs) are configured in common for each antenna group (first and second antenna groups). In this case, the UE performs measurements on multiple antenna groups in each of the RS resources and determines the spatial domain filter to be applied to the channel/signal of the UE.

<Embodiment 3-4>
As in embodiment 3-1 above, the UE may be assumed to perform beam management independently for each antenna point.

The UE is configured with an RS resource list including N RS resources for each antenna point. At this time, the UE may activate an RS resource based on an activation instruction for the RS resource included in a certain list. Next, the UE may measure the reception power/reception quality in the activated RS resource.

In addition, in this disclosure, "activate" may be interpreted interchangeably as "activate," "deactivate," "deactivate," "activate/deactivate," "update," "switch," "enable," "disable," etc.

Furthermore, when the UE receives an activation instruction for a certain RS resource included in a certain list, the UE may activate both the certain RS resource and other RS resources. The other RS resources may be multiple RS resources at an antenna point corresponding to the certain RS resource. The other RS resources may also be RS resources associated with the certain resource that are set at different antenna points.

In addition, the association of RS resources set to different antenna points may be notified to the UE by higher layer signaling, physical layer signaling, or a combination thereof. In addition, the association of RS resources set to different antenna points may be determined based on the RS resource ID.

Figure 13 shows an example of performing beam management independently for each antenna point. The configuration of the antenna points and antenna groups shown in Figure 13 is the same as that in Figure 10.

In the example shown in FIG. 13, N RS resources (SSBs) are configured for each antenna point (antenna points #0-#3). In addition, SSB#0-1, SSB#1-1, SSB#2-1, and SSB#3-1 are associated with each other.

When the UE receives an instruction to activate SSB#0-1 at antenna point #0, it activates SSB#1-1, SSB#2-1, and SSB#3-1 at each of antenna points #1 to #3 without individual signaling (e.g., MAC CE). The UE measures the received power/received quality at the activated SSB#0-1, SSB#1-1, SSB#2-1, and SSB#3-1.

The UE may also be explicitly notified of a list of spatial domain filters corresponding to each of the N RS resources for each antenna point.

For each antenna point, the UE is configured with a list of spatial domain filters corresponding to each of the N RS resources. At this time, the UE may activate a spatial domain filter corresponding to a certain RS resource based on an activation (update) instruction for the spatial domain filter corresponding to the RS resource included in the list of spatial domain filters. The UE may then apply the activated spatial domain filter to the reception (transmission) of a channel/signal for the antenna point.

Also, when the UE receives an instruction to activate (update) a spatial domain filter corresponding to a certain RS resource included in a certain list, the UE may activate each of the spatial domain filters corresponding to the certain RS resource and the RS resources associated with the certain RS resource at other antenna points. Then, the activated spatial domain filters may be applied to the reception (transmission) of channels/signals for each antenna point.

In addition, in embodiments 3-4, a case where an RS resource is set for each antenna point has been described, but the same is also applicable to a case where an RS resource is set for each antenna group, and a case where an RS resource is set for each of multiple antenna groups.

As described above, according to the third embodiment, even in communications using multiple antenna points, beam management can be performed appropriately while taking into account signaling overhead.

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

Figure 14 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 Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

In addition, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

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

The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (e.g., dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged within the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the aspect shown in the figure. Hereinafter, when there is no need to distinguish between base stations 11 and 12, they will be collectively referred to as base station 10.

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

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

In addition, the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

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

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

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

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

The radio access method may be called a waveform. In the wireless communication system 1, other radio access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL radio access methods.

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

In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH. User data, upper layer control information, etc. may be transmitted by the PUSCH. In addition, Master Information Block (MIB) 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 (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

In addition, the DCI for scheduling the PDSCH may be called a DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called a UL grant, UL DCI, etc. In addition, the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

A control resource set (COntrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH. The CORESET corresponds to the resources to search for DCI. The search space corresponds to the search region 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 certain search space based on the search space configuration.

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

The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

In this disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

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

In addition, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific Reference Signal).

(base station)
15 is a diagram showing an example of a configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may each be provided in one or more units.

In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some 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, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.

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

The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field related to the present disclosure.

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

The transmitting/receiving antenna 130 may be constructed from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

The transceiver unit 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

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

The transceiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

The transceiver unit 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

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

In addition, the transmitting unit and receiving unit of the base station 10 in the present disclosure may be constituted by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.

The transceiver 120 may perform at least one of transmitting and receiving measurement results corresponding to reference signal (RS) resources set separately for each antenna group or each antenna point. The control unit 110 may determine a spatial domain filter to be applied to at least one of transmitting and receiving signals to the antenna group or one or more of the antenna points constituting the antenna group based on the measurement results.

(User terminal)
16 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the control unit 210, the transceiver unit 220, and the transceiver antenna 230 may each include one or more.

In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some 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, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.

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

The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field related 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 reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

The transmit/receive antenna 230 may be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

The transceiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

In addition, whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the above-mentioned transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it is not necessary to perform DFT processing as the above-mentioned transmission processing.

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

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

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

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

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

The transceiver 220 may transmit or receive measurement results corresponding to reference signal (RS) resources set separately for each antenna group or each antenna point. The control unit 210 may determine a spatial domain filter to be applied to at least one of the transmission and reception of signals to the antenna group or one or more of the antenna points constituting the antenna group based on the measurement results.

The control unit 210 may control the activation of RS resources set to other antenna groups or antenna points based on the activation of RS resources set to a particular antenna group or antenna point.

(Hardware configuration)
The block diagrams used in the description of the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the transmission function may be called a transmitting unit, transmitter, etc. In either case, as described above, there is no particular limitation on the method of realization.

For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 17 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

In this disclosure, the terms apparatus, circuit, device, section, unit, etc. may be interpreted interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figures, or may be configured to exclude some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or using other techniques. The processor 1001 may be implemented by one or more chips.

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

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

In addition, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. The programs used are those that cause a computer to execute at least some of the operations described in the above-mentioned embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks.

The memory 1002 is a computer-readable recording medium and may be composed of at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or other suitable storage media. The memory 1002 may be called a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to one embodiment of the present disclosure.

Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

The communication device 1004 is hardware (transmission and reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission and reception unit 120 (220), transmission and reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission and reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one configuration (e.g., a touch panel).

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

Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

(Modification)
In addition, the terms described in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. The numerology may indicate at least one of, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame configuration, a specific filtering process performed by the transceiver in the frequency domain, and a specific windowing process performed by the transceiver in the time domain.

A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). A slot may also be a time unit based on numerology.

A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in this disclosure may be read as interchangeable with each other.

For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal by allocating radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units. Note that the definition of TTI is not limited to this.

A TTI may be a transmission time unit for a channel-coded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

In addition, when one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. In addition, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length less than the TTI length of a long TTI and equal to or greater than 1 ms.

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

In addition, an RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

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

A Bandwidth Part (BWP), which may also be referred to as partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by an index of the RB relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

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

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be read as "BWP".

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

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

The names used for parameters, etc. in this disclosure are not limiting in any respect. Furthermore, the formulas, etc. using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and the various names assigned to these various channels and information elements are not limiting in any respect.

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

In addition, information, signals, etc. may be output from a higher layer to a lower layer and/or from a lower layer to a higher layer. Information, signals, etc. may be input/output via multiple network nodes.

Input/output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input/output information, signals, etc. may be overwritten, updated, or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

Notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or combinations thereof.

The physical layer signaling may be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, using a MAC Control Element (CE).

In addition, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

The determination may be based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or a numerical comparison (e.g., with a predetermined value).

Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

Additionally, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave, etc.), then these wired and/or wireless technologies are included within the definition of a transmission medium.

As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., a base station).

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

In this disclosure, terms such as "Base Station (BS)", "Radio base station", "Fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission/Reception Point (TRP)", "Panel", "Cell", "Sector", "Cell group", "Carrier", "Component carrier", etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

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

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

In addition, the base station in the present disclosure may be read as a user terminal. For example, each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the user terminal 20 may be configured to have the functions possessed by the above-mentioned base station 10. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, etc. may be read as a side channel.

Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

In the present disclosure, operations that are described as being performed by a base station may in some cases be performed by its upper node. In a network including one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

Each aspect/embodiment described in this disclosure may be used alone, in combination, or switched between depending on the implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect/embodiment described in this disclosure may be reordered as long as there is no inconsistency. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

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

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

Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

"Determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

In addition, "judgment" may be considered to be "judging" resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" may be considered to be "judging" some action.

In addition, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

The "maximum transmit power" referred to in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

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

In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

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

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

In this disclosure, where articles have been added by translation, such as a, an, and the in English, this disclosure may include that the nouns following these articles are in the plural form.

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

Claims (4)

A receiver that receives a first configuration of first channel state information reference signal ( CSI -RS) resources corresponding to a first plurality of antenna ports and a second configuration of second CSI-RS resources corresponding to a second plurality of antenna ports, and the first plurality of antenna ports and the second plurality of antenna ports are respectively associated with different transmission/reception points (TRPs) ;
A terminal having a control unit that controls measurement in the first CSI-RS resource based on the first configuration and controls measurement in the second CSI-RS resource based on the second configuration . receiving a first configuration of first channel state information reference signal ( CSI -RS) resources corresponding to a first plurality of antenna ports and a second configuration of second CSI-RS resources corresponding to a second plurality of antenna ports, the first plurality of antenna ports and the second plurality of antenna ports corresponding to different transmission/reception points (TRPs) ;
A wireless communication method for a terminal, comprising the steps of controlling measurements in the first CSI-RS resource based on the first setting , and controlling measurements in the second CSI-RS resource based on the second setting . A transmitter that transmits a first configuration of first channel state information reference signal ( CSI -RS) resources corresponding to a first plurality of antenna ports and a second configuration of second CSI-RS resources corresponding to a second plurality of antenna ports, and the first plurality of antenna ports and the second plurality of antenna ports correspond to different transmission/reception points (TRPs), respectively ;
A control unit that uses the first configuration to instruct measurement on the first CSI-RS resource and uses the second configuration to instruct measurement on the second CSI-RS resource . A system having a base station and a terminal,
The base station,
a transmitter that transmits a first configuration of first channel state information reference signal (CSI-RS) resources corresponding to a first plurality of antenna ports and a second configuration of second CSI-RS resources corresponding to a second plurality of antenna ports, the first plurality of antenna ports and the second plurality of antenna ports corresponding to different transmission/reception points (TRPs);
The terminal includes:
a receiving unit that receives the first setting and the second setting;
A control unit that controls measurements in the first CSI-RS resource based on the first configuration and controls measurements in the second CSI-RS resource based on the second configuration.

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