WO2021166195A1 - Terminal, wireless communication method, and base station - Google Patents

Abstract

A terminal according to an embodiment of the present disclosure comprises: a control unit that controls the measurement of resources for DL reference signals from one or more antenna points constituting respective antenna groups, the DL reference signal resource being set separately for each antenna group or for each antenna point; and a transmission unit that transmits measurement results for the DL reference signal resources.

Description

Terminals, wireless communication methods and base stations

This disclosure relates to terminals, wireless communication methods and base stations in next-generation mobile communication systems.

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

Successor systems to LTE (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. ..

Rel. In NR after 17, in the communication between the user terminal (user terminal, User Equipment (UE)) and the network (Network (NW), for example, base station), distributed MIMO (Multi Input Multi Output) by millimeter wave (mmWave) is used. It is being considered to use it to expand area coverage.

Such Rel. In the distributed MIMO technology, which is considered to be adopted in 17 or later, the communication control method between the NW and the UE has not yet been studied. Unless this communication control is clarified, an increase in communication throughput may be suppressed.

Therefore, one of the purposes of the present disclosure is to provide a terminal, a wireless communication method, and a base station capable of appropriately performing communication even when the distributed MIMO technology is utilized.

The terminal according to one aspect of the present disclosure includes a control unit that controls measurement of DL reference signal resources separately set for each of the antenna groups or for each of the antenna points from one or more antenna points constituting the antenna group. It is characterized by having a transmission unit for transmitting the measurement result of the DL reference signal resource.

According to one aspect of the present disclosure, communication can be appropriately performed even when the distributed MIMO technology is utilized.

FIG. 1 is a diagram showing an example of SFN in a tunnel. 2A and 2B are diagrams showing an example in which a plurality of antennas or a plurality of TRPs are arranged around a base station. 3A and 3B are diagrams showing an example of the configuration of an antenna arranged around a base station. FIG. 4 is a diagram showing an example of communication by the antenna configuration (1). FIG. 5 is a diagram showing an example of communication by the antenna configuration (2). 6A and 6B are diagrams showing an example of communication according to the antenna configuration (2). FIG. 7 is a diagram showing an example of DL measurement control when applying an antenna group including one or more antenna points. 8A-8C are diagrams showing an example of control for reporting measurement results for each antenna point / antenna group. FIG. 9 is a diagram showing an example of control for reporting measurement results for each antenna point / antenna port / antenna group. FIG. 10 is a diagram showing an example of UL measurement control when an antenna group including one or more antenna points is applied. 11A and 11B are diagrams showing an example of the association between the antenna point and the antenna group. 12A and 12B are diagrams showing an example of the association between the antenna point and the antenna group. FIG. 13 is a diagram showing an example of association with the antenna point, the antenna port, and the antenna group. FIG. 14 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 15 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 16 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 17 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

A wireless communication method using millimeter waves has been introduced in the successor system of LTE (for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR)). Rel. In 15 NR, hybrid beamforming (for example, Beam Management) by large-scale MIMO (Massive MIMO) was introduced, and Rel. 16 In NR, the communication speed and reliability of the downlink shared channel (PDSCH) have been improved by introducing distributed MIMO (multi-TRP).

Rel. In NR after 17, 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, Rel. In the NR after 17, it is expected that the beam management will be improved in the scenario of using a moving body (HTS (High Speed Train)) such as a train moving at high speed.

However, the above improvement in communication speed and reliability is a best effort type, and the applicable area is limited.

In the successor system of NR (for example, also referred to as 5G +, 6G, etc.), compared with the above 5G, higher data rate / capacity, wide coverage, low energy / cost, low latency, high reliability, multiple connections, etc. Is required. In the present disclosure, "A / B" may mean "at least one of A and B".

With the above 6G demand, it is expected that the best effort type communication will be switched to the quality assurance type communication. In addition, it is expected that high-speed / high-reliability communication will be extended to all areas, not limited to areas.

There are multiple issues with wireless communication methods using millimeter waves. For example, an increase in propagation loss due to an increase in communication distance, an increase in non-line of sight due to high straightness of radio waves, and a high-order SU-MIMO (Single User MIMO) due to a small number of multipaths. There are concerns about difficulty in implementation and an increase in equipment installation density due to an increase in the size of the equipment.

In the LTE system, a single frequency network (Single Frequency Network (SFN), which has the same cell ID for each antenna) using multiple small antennas in a building (for example, a tunnel, a building, etc.) is operated. .. SFN is a method of transmitting the same signal at the same time in the same physical resource block (PRB) using a plurality of antennas, and it is assumed that the UE receiving the signal transmits the signal from one point.

FIG. 1 is a diagram showing an example of SFN in a tunnel. In FIG. 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 having a transmission power of about 1-5 W. The small antenna may be, for example, an antenna having a transmission power of about 250 mW. The large antenna may transmit downlink (DL) signals in and out of the tunnel, and the small antenna may transmit DL signals into and out of the tunnel. The large antenna may perform a handover before the UE enters the tunnel. The large antenna and the small antenna of FIG. 1 may simultaneously transmit the same DL signal to one UE in the same PRB. The arrangement and transmission power of each antenna in FIG. 1 are merely examples, and are not limited to this example. Further, SFN in the tunnel may be read as IMCS (Inbuilding Mobile Communication System).

In the present disclosure, "transmission of DL signal at the antenna" may be read as "reception of uplink (UL) signal at the antenna". Further, "reception of DL signal in UE" may be read as "transmission of UL signal in UE".

In order to expand the area using distributed MIMO using millimeter waves, a method of extending a large number of antenna points is being studied. For example, a method of securing a high-speed and high-reliability area may be used by extending a plurality of high-frequency antennas having a relatively narrow coverage from a low-frequency base station having a relatively wide coverage as shown in FIG. 2A.

In the present disclosure, a low-frequency base station having a relatively wide coverage may be simply referred to as a base station. Further, a high frequency antenna having a relatively narrow coverage may be simply called an antenna.

The plurality of antennas may be installed and operated not only outdoors but also indoors on the ceiling / wall. For example, it may be installed near an indoor illumination light source, and in this case, there is a high possibility that it will be in line of sight for a plurality of indoor UEs, and it is possible to reduce the propagation loss.

FIG. 2A is a diagram showing an example in which a plurality of antennas are arranged around the base station. For example, the method of extending the antenna points as shown in FIG. 2A can be realized at low cost, but it is difficult to optimize the resource utilization efficiency, and the propagation loss increases as the distance of the high-frequency antenna increases. There is a problem.

On the other hand, in order to expand the area by utilizing distributed MIMO using millimeter waves, a method of extending a part of the base station function to the vicinity of the high frequency antenna is also being studied. This method is similar to the method of arranging a plurality of transmission / reception points (Transmission / Reception Point (TRP)) around the base station.

FIG. 2B is a diagram showing an example in which a plurality of TRPs are arranged around the base station. For example, in the method of projecting a plurality of TRPs around a base station as shown in FIG. 2B, resource control is possible for each TRP, and even if the distance between the TRPs is extended, it is propagated by utilizing an optical fiber or the like. The loss can be reduced.

In the present disclosure, the "antenna point" means "an antenna corresponding to (corresponding to) a physical antenna element" and "an antenna corresponding to (corresponding to) a plurality of physical antenna elements (physical antenna elements)". You may. Further, the antenna port corresponds to "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", and "a signal output from one or more antenna points". It may mean "logical entity" or the like. Further, the "antenna group" may mean "a plurality of antennas composed of one or more antenna points" and "a plurality of antennas composed of one or more antenna ports".

Further, in the present disclosure, the "antenna point" refers to "antenna end", "antenna port", "antenna group", "antenna element", "antenna position", "high frequency antenna point", "high frequency antenna end", and " It may be read as "high frequency antenna port", "high frequency antenna group", "high frequency antenna element", "high frequency antenna position" and the like.

Further, in the present disclosure, the "antenna group" may be read as "antenna group", "antenna set", "high frequency antenna group", "high frequency antenna group", "high frequency antenna set" and the like.

Two configurations are being studied as a method of extending a large number of antenna points for expanding the area using distributed MIMO using millimeter waves.

One is, as shown in FIG. 3A, a configuration in which a high-frequency antenna is connected by an electric wire or the like and continuously extended in a certain direction (antenna configuration (1)) is being studied. In the case of this antenna configuration, although the configuration cost can be suppressed, it is conceivable that the antenna loss increases as the antenna is relatively far from the base station.

The other is a configuration (antenna configuration (2)) of relaying to some antennas (for example, relaying using an optical fiber, IAB, etc.) as shown in FIG. 3B. With this antenna configuration, it is possible to suppress antenna loss even with an antenna that is relatively far from the base station.

In the case of the antenna configuration (1), the same signal may be transmitted from all antenna points. If there is a UE in the vicinity of any of the plurality of high-frequency antenna points, DL communication is possible with the UE. At this time, the NW does not need to recognize which antenna the UE is in the vicinity of, so that the overhead can be suppressed. However, if the same transmission signal is transmitted from all antenna points, the location frequency utilization efficiency deteriorates.

FIG. 4 is a diagram showing an example of communication by the antenna configuration (1). In FIG. 4, a DL signal directed to the UE 1 is transmitted from the high frequency antenna. In this case, UE1 in the vicinity of the high frequency antenna can communicate. The contribution of the transmission signal to the UE 1 from the high-frequency antenna relatively far from the base station to the improvement of the reception signal to the UE 1 is small. Therefore, it is also preferable to utilize the frequency resource for UE2 and the like in the vicinity of the high frequency antenna.

In order to solve the problem of the antenna configuration (1), a series of antenna points are divided into a plurality of antenna points, an antenna group consisting of a plurality of continuous antenna points is provided, and an independent transmission signal is transmitted for each antenna group. It is conceivable to do.

FIG. 5 is a diagram showing an example of communication by the antenna configuration (2). For example, as shown in FIG. 5, an antenna point relatively close to the base station (antenna points # 1 to # 4) is set as the first antenna group, and an antenna point relatively far from the base station (antenna points # 5 to # 8). When is set as the second antenna group, the UE 1 in the vicinity of the first antenna group and the UE 2 in the vicinity of the second antenna group can appropriately communicate with the NW.

The configuration of the example of FIG. 5 has a function that the base station schedules for each antenna group, and may be relayed for each antenna group (for example, relay by overhanging an optical fiber) or for each antenna group. It may have some functions of the station.

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

6A and 6B are diagrams showing an example of communication according to the antenna configuration (2). In FIG. 6A, a common DL signal is transmitted to UE1 and UE2 in the first antenna group and the second antenna group. On the other hand, in FIG. 6B, the first antenna group transmits the DL signal 1 to the UE 1, and the second antenna group transmits the DL signal 2 to the UE 2.

(TCI, spatial relationship, QCL)
In NR, reception processing (for example, reception, demapping, reception, demapping, etc.) in the UE of at least one of the signal and the channel (hereinafter referred to as a signal / channel) based on the transmission setting instruction state (Transmission Configuration Indication state (TCI state)). Controlling demodulation (at least one of decoding) and transmission processing (eg, at least one of transmission, mapping, precoding, modulation, and coding) is being considered.

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

The TCI state is information related to signal / channel pseudo collocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameters, spatial relation information, or the like. The TCI state may be set in the UE on a channel-by-channel or signal-by-signal basis.

In the present disclosure, the TCI state of DL may be read as the spatial relationship of UL, the TCI state of UL, and the like.

QCL is an index showing the statistical properties of signals / channels. For example, when one signal / channel and another signal / channel have a QCL relationship, Doppler shift, Doppler spread, and average delay are performed between these different signals / channels. ), Delay spread, and spatial parameter (for example, spatial Rx parameter) can be assumed to be the same (QCL for at least one of these). You may.

The spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).

A plurality of types (QCL types) may be specified for the QCL. For example, four QCL types AD with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (which may be referred to as QCL parameters) are shown below:
QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread,
-QCL type B (QCL-B): Doppler shift and Doppler spread,
QCL type C (QCL-C): Doppler shift and average delay,
-QCL type D (QCL-D): Spatial reception parameter.

The UE may assume that a given control resource set (Control Resource Set (CORESET)), channel or reference signal has a specific QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. , QCL assumption (QCL assumption) may be called.

The UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state of the signal / channel or the QCL assumption.

The TCI state may be, for example, information about the QCL of the target channel (in other words, the reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another RS). .. The TCI state may be set (instructed) by higher layer signaling, physical layer signaling, or a combination thereof.

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

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

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

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

The RS having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a measurement reference signal (Sounding). It may be at least one of Reference Signal (SRS)), CSI-RS for tracking (also referred to as Tracking Reference Signal (TRS)), and reference signal for QCL detection (also referred to as QRS).

The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may be referred to as an SS / PBCH block.

The information element of the TCI state (“TCI-state IE” of RRC) set by the upper layer signaling may include one or more QCL information (“QCL-Info”). The QCL information may include at least one of information related to the RS having a QCL relationship (RS-related information) and information indicating the QCL type (QCL type information). RS-related information includes RS index (for example, SSB index, non-zero power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (Identifier)), cell index where RS is located, and RS position. Information such as the index of the Bandwidth Part (BWP) to be used may be included.

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

When TRS is set as the RS of QCL type A, it is assumed that the same TRS is periodically transmitted over a long period of time, unlike the PDCCH or PDSCH demodulation reference signal (DeModulation Reference Signal (DMRS)). Will be done. The UE can measure the TRS and calculate the average delay, delay spread, and so on.

A UE in which the TRS is set as the QCL type A RS in the TCI state of the PDCCH or PDSCH DMRS has the same parameters (average delay, delay spread, etc.) of the PDCCH or PDSCH DMRS and the TRS QCL type A. Since it can be assumed that there is, the parameters (average delay, delay spread, etc.) of DMRS of PDCCH or PDSCH can be obtained from the measurement result of TRS. When performing at least one channel estimation of PDCCH and PDSCH, the UE can perform more accurate channel estimation by using the measurement result of the TRS.

A UE set with a QCL type D RS can determine a UE reception beam (spatial domain reception filter, UE spatial domain reception filter) using the QCL type D RS.

A TCI-state QCL type X RS may mean an RS that has a QCL type X relationship with a channel / signal (DMRS), and this RS is called the TCI-state QCL type X QCL source. You may.

By the way, Rel. In the distributed MIMO technology, which is considered to be adopted in 17 or later, the communication control method between the NW and the UE has not yet been studied.

For example, when controlling communication with a UE by using a plurality of antenna groups including one or more antenna points or antenna ports, the network (for example, a base station) uses an antenna group suitable for communication of each UE. Alternatively, it is required to select and communicate. However, there is not enough consideration on how to determine the appropriate antenna group for each UE on the network side.

Therefore, the present inventors have focused on the fact that the measurement result of the UL signal / DL signal can be used for grasping the relationship (for example, the positional relationship) between the antenna point / antenna port and the UE as one aspect of the present embodiment. The idea was to control UL measurement or DL measurement for each antenna point / antenna port / antenna group.

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

(First aspect)
In order for the network (for example, a base station) to grasp the antenna point / antenna group (for example, the antenna point / antenna group near the UE) suitable for communication with a certain UE, at least one of the following options 1 and 2 is used. May be applied.

<Option 1>
The base station may specify the antenna point / antenna group corresponding to each UE (or close to each UE) based on the measurement result of the DL transmission transmitted (or reported) from the UE. The DL transmission may be at least one of a DL signal, a DL channel, and a DL reference signal. In the following description, a case where a DL reference signal is used will be described as an example.

The UE measures the predetermined DL reference signal resource (or the DL reference signal transmitted by the predetermined DL reference signal resource), and transmits the measurement result to the base station. For example, the UE may measure the received signal for each antenna point / antenna group for the DL reference signal resource and report the measurement result. The measurement of the received signal may be a measurement of at least one of received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), and signal strength (eg, RSSI).

The predetermined DL reference signal resource may be defined in advance in the specifications, or may be set or notified from the base station to the UE by at least one of higher layer signaling and DCI. The predetermined DL reference signal resource may be specified by at least one of a time resource, a frequency resource, a comb, a sequence, a cyclic shift, and a quadrature code.

Further, the predetermined DL reference signal resource may be set separately for each antenna point / for each antenna group. That is, at least one of the time resource, the frequency resource, the comb, the sequence, the cyclic shift, and the orthogonal code may be set differently for each antenna point / antenna group. Further, the time resource may include the periodicity of the DL reference signal resource and the like.

When the DL reference signal resource is set for each antenna group, a common DL reference signal resource may be set for a plurality of antenna points (or antenna ports) included in the antenna group. In this case, it is possible to suppress an increase in the amount of signaling of the DL reference signal resource to the UE.

Further, for a plurality of antenna points or a plurality of antenna groups, at least some parameters of time, frequency, comb, sequence, cyclic shift, and orthogonal code are set in common, and the remaining parameters are set separately. You may.

When the DL reference signal resource corresponding to each antenna point / each antenna group is set, the UE controls to measure each DL reference signal resource and report a part or all of the measurement result. May be good. The measurement result reporting conditions (for example, reporting timing, cycle, etc.) may be defined in advance in the specifications, or may be set or notified from the base station to the UE by at least one of higher layer signaling and DCI.

For example, the base station may instruct (or trigger) at least one of measurement and reporting using the DL reference signal to the UE using at least one of DCI and higher layer signaling. The UE may report the measurement result periodically, semi-persistently, or aperiodically based on the instruction or trigger from the base station.

FIG. 7 is a diagram showing an example of measuring a DL reference signal transmitted from one or more antenna points / antenna groups using a DL reference signal resource. FIG. 7 shows a case where the first antenna group # 0 including the antenna points # 0 to # 3 and the second antenna group # 1 including the antenna points 4 to # 7 are set. The number of antenna groups, the number of antenna points included in each antenna group, the index, etc. are not limited to this.

UE # 1 measures the DL reference signal resource set for each antenna group or each antenna point. When a plurality of antenna points are included in one antenna group, the DL reference signal resource may be set only for a specific antenna point, or the DL reference signal resource may be set for all the antenna points. You may. Here, a case where a DL reference signal resource is set for each antenna point (or a DL reference signal is transmitted from each antenna point) is shown.

The UE reports the measurement result of the DL reference signal resource corresponding to each antenna point to the base station. The UE may report the measurement result as a part of the channel state information (for example, L1-CSI) of the layer 1 (or the physical layer or the lower layer). Alternatively, the UE may report the measurement result as a layer 2 report (for example, L2-MAC CE report).

The UE may report all the measurement results among the measurement results measured for each antenna point / antenna group, or may control to report some measurement results.

For example, the UE may control to report M measurement results in descending order of received power / reception quality. Further, when the UE measures a plurality of antenna groups (or antenna points included in the plurality of antenna groups), the UE has at least one antenna point (for example, reception power / reception quality is maximum) for each antenna group. It may be controlled to report the measurement result of. As a result, the base station can grasp the reception status of the UE for the plurality of antenna groups.

Alternatively, the UE may report N pieces from the highest of the maximum / best value or the minimum / minimum value from the measurement results measured for each antenna point / antenna group. The number of report results to be reported (for example, N) may be notified or set to the UE by higher layer signaling or the like. If the number of reported results is not set by higher layer signaling, the UE may report a predetermined number (also referred to as the default number) of measurement results. The predetermined number may be 1, for example.

The UE may apply at least one of the following reporting operations 1 and 2 as a report of the measurement result.

[Report operation 1]
The UE may report all the measured antenna points in order from the maximum value. In this case, the UE may report N measurement results in order from the maximum value among all the measured antenna points. FIG. 8A shows an example of the measurement results in the first antenna group # 0 including the antenna points # 0 to # 3 and the second antenna group # 1 including the antenna points 4 to # 7.

In FIG. 8A, when N = 4, the UE may report the measurement results corresponding to the antenna points # 3, # 4, # 2, and # 5 (see FIG. 8B). As a result, the base station can grasp the relationship between each antenna point and the UE (for example, the positional relationship between the UE and the antenna point).

Further, when reporting a plurality of measurement results, the difference between the predetermined measurement result as a reference and the predetermined measurement result may be reported. For example, when reporting the measurement results corresponding to the antenna points # 3, # 4, and # 2, the difference between one reference measurement result (for example, the measurement result of # 3) and the measurement result (for example, # The difference between 3 and # 2, the difference between # 3 and # 1) may be reported. As a result, it is possible to suppress an increase in the overhead of reporting the measurement result. The reference measurement result is not limited to the maximum measurement result (here, # 3), and may be another measurement result (# 2 or # 1).

[Report operation 2]
The UE may control the reporting of measurement results on an antenna group basis. That is, at least one measurement result corresponding to each antenna group may be controlled to be reported.

For example, the UE may be controlled to report N measurement results in order from the maximum value for each antenna group (reporting operation 2-1). In FIG. 8A, when N = 2, the UE has the measurement results corresponding to the antenna points # 3 and # 2 included in the first antenna group # 0, and the measurement results # 4 included in the second antenna group # 1. The measurement result corresponding to # 5 may be reported. As a result, the base station can grasp the reception status (for example, received power) of the UE with respect to the DL reference signal of each antenna group.

N may be 1. In this case, the UE may report the antenna point with the highest measurement result in each antenna group. As a result, it is possible to suppress an increase in the overhead of reporting the measurement result.

Alternatively, the UE may calculate or calculate the average value (or total value) of a plurality of antenna points included in the antenna group and report it (report operation 2-2). In FIG. 8A, the UE has an average value (or total value) of antenna points # 0 to # 3 included in the first antenna group # 0 and antenna points # 4 to included in the second antenna group # 1. The average value (or total value) of # 7 may be reported (see FIG. 8C).

Alternatively, the UE may calculate or calculate and report N average values (or total values) in order from the maximum value among the plurality of antenna points included in the antenna group (reporting operation 2-3). Alternatively, instead of or in addition to the maximum value, N average values (or total values) may be calculated or calculated and reported in order from the minimum value.

Alternatively, the UE may calculate or calculate and report the average value (or total value) of the remaining antenna points excluding N in order from the maximum value among the plurality of antenna points included in the antenna group (report). Operation 2-4). Alternatively, instead of or in addition to the maximum value, the average value (or total value) of the remaining antenna points excluding N in order from the minimum value may be calculated or calculated and reported.

[variation]
FIG. 8A shows a case where antenna points having different indexes are associated with each other over a plurality of antenna groups (here, the first antenna group # 1 and the second antenna group # 2), but the present invention is not limited to this. For example, an antenna port to be indexed may be set for each antenna group (or for each antenna group), and the reporting of the measurement result may be controlled based on the antenna port.

FIG. 9 shows a case where four antenna ports (# 0 to # 3) are associated with each antenna group (here, the first antenna group # 1 and the second antenna group # 2). The antenna point may be set separately from the antenna port. In this case, the association between the antenna port and the antenna point may be notified from the base station to the UE by higher layer signaling or the like.

The UE may be controlled to report only the measurement result corresponding to a specific antenna port (for example, # 0) of each antenna group. Alternatively, the UE may be controlled to report the antenna group that maximizes the measurement result at each antenna port.

<Option 2>
By measuring the UL transmission by the base station, the antenna points / antenna groups in which each UE is close to each other may be specified on the base station side. The UL transmission may be at least one of the UL signal, the UL channel and the UL reference signal.

For example, the base station may measure the received signal for each antenna point / antenna group for UL transmission transmitted from the UE, and determine the antenna point / antenna group in which each UE is close. The measurement of the received signal may be a measurement of at least one of received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), and signal strength (eg, RSSI).

The UE transmits a UL signal / UL channel / UL reference signal using a predetermined UL resource. A given UL resource may be predefined in the specification or may be configured or notified from the base station to the UE by at least one of higher layer signaling and DCI. The UL resource may be specified by at least one of a time resource, a frequency resource, a comb, a sequence, a cyclic shift, and a quadrature code. Further, the time resource may include the periodicity of the UL resource and the like.

FIG. 10 is a diagram showing an example of measuring the UL transmission (for example, UL reference signal) transmitted from the UE at each antenna point. FIG. 10 shows an example in which the base station measures UL transmission (for example, UL reference signal) transmitted from UE # 1 for each antenna point.

The base station may determine the antenna point (or the antenna group having the antenna point) having the highest received power for the UL transmission of a certain UE as the antenna point (or the antenna group) in the vicinity of the UE. Here, since the received power at the antenna point # 1 adjacent to the UE # 1 is the highest, the base station has the first antenna group # in which the UE # 1 includes the antenna point # 1 (or the antenna point # 1). It may be determined that it exists in the vicinity of 1).

The base station controls to use the first antenna group # 1 for communication with the UE # 1 based on the measurement result (for example, transmit the DL signal from the first antenna group # 1).

In this way, by measuring UL transmission in units of antenna points (or in units of antenna groups), the antenna group used by each UE for communication can be appropriately determined.

(Second aspect)
Separate TCI states may be set for each antenna point. In other words, the UE may assume that the TCI states are set separately (eg, different TCI states) for each antenna point. In the present disclosure, the TCI state may be read as at least one of DL TCI state, UL TCI state, unified TCI state, spatial relationship, QCL, QCL assumption, and 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. Further, the UE may assume that the TCI state is set separately for each of a plurality of antenna points (sets).

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

In the present disclosure, the CDM group, group, CORESET, PDSCH, code word, antenna port group (for example, DMRS port group), reference signal group, CORESET group, and the like may be read as each other. Further, the antenna group and the TRP may be read as each other.

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

According to the TCI state (QCL) setting method in the second aspect, communication can be appropriately performed even when the physical distance between the antenna points is large.

Further, at least one of the UE and the NW may independently perform signal processing (for example, precoding) 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 having 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 (Reference Signal (RS)) (for example, SRS), and the NW may perform channel state information (CSI) measurement based on the reference signal. In this case, the NW can suitably measure the channel including the phase difference of each antenna point.

Further, for example, when CSI measurement is performed by DL RS, the UE may perform CSI measurement based on a new CSI codebook that considers the phase difference of signals between antenna points. In other words, the UE may perform signal processing of the DL signal 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 measurements on a plurality of panels assuming that one panel corresponds to one antenna point. The plurality of panels may be non-coherent.

In the present disclosure, CSI may be measured for each antenna point, for each antenna port, for each antenna group, or for each of a plurality of antenna groups. May be good.

According to the CSI measurement method in the second aspect, appropriate communication can be performed in consideration of the phase difference of each antenna point.

(Third aspect)
In the following, the association between the antenna point and the antenna group composed 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 these.

The UE may assume that the antenna point and the antenna group are associated with each other based on a certain rule. The rule may be specified in advance in the specifications. For example, X antenna points (X is an arbitrary natural number) may be set as a unit of one antenna group, and the X may be specified in the specifications. For example, as shown in FIG. 11A, one antenna group may be configured for every four antenna points.

In addition, the UE is associated with the antenna point and the antenna group by upper layer signaling, physical layer signaling, or a combination thereof (at least one of notification, setting, update, activation, and deactivation is performed). May be assumed. In this case, flexible communication control is possible according to the distribution of a plurality of UEs, the amount of traffic, and the like.

For example, as shown in FIG. 11B, the association between the antenna point and the antenna group may be updated by upper layer signaling, physical layer signaling, or a combination thereof.

Note that each antenna point included in the antenna group does not have to be continuous. For example, the UE may be notified by a bitmap about the antenna points included in the antenna group.

The antenna point number (ID, index) may be a local number in each antenna group. For example, as in the example shown in FIG. 12A, antenna point numbers (# 0- # 3 in this case) may be set in ascending order within each antenna group. Further, the antenna point numbers may be common to each antenna group. In this case, the numbers of the plurality of antenna points constituting the different antenna groups may be common or may be different. For example, as in the example shown in FIG. 12B, the same antenna point number (# 0 in this case) may be set.

In this disclosure, the ascending order may be read as the descending order.

Further, the association between the (corresponding) antenna point corresponding to the physical antenna element (or a set of a plurality of physical antenna elements) and the antenna port of the signal processing unit may be set (or specified, instructed). .. For example, as in the example shown in FIG. 13, a number for associating each antenna point included in the first and second antenna groups with the antenna port of the signal processing unit may be set.

The association of the antenna point, the antenna port, and the antenna group may be explicitly notified to the UE by the upper layer signaling, the physical layer signaling, or a combination thereof.

For example, the association between the antenna point, the antenna port, and the antenna group may be notified to the UE by higher layer signaling (for example, RRC signaling, MAC CE).

Further, regarding the association of the antenna point, the antenna port and the antenna group, a plurality of associations may be notified to the UE by higher layer signaling (for example, RRC signaling, MAC CE). The UE may determine one of the plurality of associations by DCI. The DCI may be a DCI that schedules control channels / shared channels, and may specify instruction fields for associating antenna points, antenna ports, and antenna groups. The size of the indicator field _{may be Ceil (log 2} (M)) bits. At this time, M may be the number of candidates notified to the UE by higher layer signaling (or the number of the above associations set in the UE). In this disclosure, Ceil (X) may mean the ceiling function of X.

Further, the UE may implicitly judge the association between the antenna point, the antenna port, and the antenna group.

For example, the UE may implicitly determine the association of antenna points, antenna ports, and antenna groups based on the physical resources of DCI (or PDCCH that transmits DCI). The physical resources of the DCI are at least the time resource, frequency resource, control channel element (CCE) index, search space index, control resource set (CORESET) index, and aggregation level of the DCI. There may be one. For example, the UE may divide the value of the CCE index (or the value of the aggregation level, or the value of the CCE index divided by the aggregation level) by a certain integer, and divide the value by an integer to obtain the antenna point and antenna port specified by the NW. And it may be assumed that it is a value related to the association of antenna groups.

Further, for example, the UE may assume that the antenna point, the antenna port, and the antenna group of the data schedule by the DCI are determined based on the association of the antenna point, the antenna port, and the antenna group of the DCI. For example, the UE may assume that the association of the antenna point, the antenna port, and the antenna group of the DCI is common to the association of the antenna point, the antenna port, and the antenna group of the data schedule by the DCI. Further, for example, the UE may apply the conversion formula in the association of the antenna point, the antenna port, and the antenna group of the DCI to determine the association of the antenna point, the antenna port, and the antenna group of the data schedule by the DCI.

Further, for example, the UE may assume that the antenna point, the antenna port, and the antenna group of the data schedule by the DCI are determined based on the TCI state of the DCI (or the PDCCH that transmits the DCI).

Note that the association between the antenna point and the antenna group described in the third aspect may be the same or different for the uplink and the downlink. Further, the association may be set, activated, determined, etc. for each channel or reference signal, or may be set, activated, determined, etc. in common for a plurality of channels / reference signals.

According to the third aspect, the UE can perform appropriate communication based on the association of the antenna point, the antenna port, and the antenna group.

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

FIG. 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), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..

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

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 base station (gNB) of NR is MN, and the base station (eNB) of LTE (E-UTRA) is SN.

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

The wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. You may prepare. The user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

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

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)). The macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2. For example, FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz). The frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

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

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

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

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

In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, at least one of the downlink (Downlink (DL)) and the uplink (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 wireless access method may be called a waveform. In the wireless communication system 1, another wireless access system (for example, another single carrier transmission system, another multi-carrier transmission system) may be used as the UL and DL wireless access systems.

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

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

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

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

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

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

One 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. The "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. of the present disclosure may be read as each other.

Depending on the PUCCH, channel state information (Channel State Information (CSI)), delivery confirmation information (for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.) and scheduling request (Scheduling Request ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted. The PRACH may transmit a random access preamble to establish a connection with the cell.

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

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

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

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

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

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

The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

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

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

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

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

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

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

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

The transmission / reception unit 120 (transmission processing unit 1211) performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. The base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog conversion, and other transmission processing.

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

On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.

The transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.

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

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

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

The transmission / reception unit 120 may transmit at least one of the information regarding the DL reference signal resource and the information regarding the reporting conditions. Further, the transmission / reception unit 120 may receive the measurement result of the DL reference signal resource.

The control unit 110 may control the DL reference signal resource to be set separately for each antenna group or for each antenna point from one or more antenna points constituting the antenna group.

(User terminal)
FIG. 16 is a diagram showing an example of the configuration of the user terminal according to the embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. The control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.

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

The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The transmission / reception unit 220 may receive at least one of the information regarding the DL reference signal resource and the information regarding the reporting conditions. Further, the transmission / reception unit 220 may transmit the measurement result of the DL reference signal resource.

The control unit 210 may control the measurement of the DL reference signal resource set separately for each antenna group or for each antenna point from one or more antenna points constituting the antenna group.

At least one of time, frequency, comb, sequence, cyclic shift, and orthogonal code may be set separately for the DL reference signal resource corresponding to different antenna groups or different antenna points.

When there are a plurality of measured DL reference signal resources, the control unit 210 may determine the report result to be transmitted based on the conditions set by the upper layer signaling.

When a plurality of antenna groups are set, the control unit 210 may be controlled to transmit the measurement result corresponding to at least one antenna point included in each antenna group.

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

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

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

In this disclosure, the terms of devices, circuits, devices, sections, units, etc. can be read as each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

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

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

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

Further, the processor 1001 reads a program (program code), a software module, data, 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. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.

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

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

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). May be configured to include. For example, the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).

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

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

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

(Modification example)
The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols and signals (signals or signaling) may be read interchangeably. Also, the signal may be a message. The reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard. Further, the component carrier (Component Carrier (CC)) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

In addition, information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers. Information, signals, etc. may be input / output via a plurality of network nodes.

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

The notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using other methods. For example, the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, 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 May be carried out by.

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

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

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

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

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

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

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

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

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

In this disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" are used interchangeably. Can be done.

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

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

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

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

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

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

Each aspect / embodiment described in the present disclosure includes 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, integer, fraction)), 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) , LTE 802.11 (Wi-Fi®), LTE 802.16 (WiMAX®), LTE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other suitable radios. It may be applied to a system using a communication method, a next-generation system extended based on these, and the like. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

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

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

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

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

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

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

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

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

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

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

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

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

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

Claims (6)

1. A control unit that controls the measurement of DL reference signal resources set separately for each antenna group or each antenna point from one or more antenna points constituting the antenna group.
   A terminal having a transmission unit for transmitting a measurement result of the DL reference signal resource.
2. The DL reference signal resource corresponding to a different antenna group or a different antenna point is characterized in that at least one of time, frequency, comb, sequence, cyclic shift, and orthogonal code is set separately. The terminal described in.
3. The control unit determines the report result to be transmitted based on the conditions set by the upper layer signaling when there are a plurality of the DL reference signal resources for which the measurement has been performed. The terminal described in.
4. When a plurality of antenna groups are set, the control unit controls to transmit measurement results corresponding to at least one antenna point included in each antenna group, according to claims 1 to 3. The terminal described in any of.
5. A process of controlling the measurement of DL reference signal resources separately set for each antenna group or for each antenna point from one or more antenna points constituting the antenna group.
   A wireless communication method comprising a step of transmitting a measurement result of the DL reference signal resource.
6. A control unit that controls one or more antenna points constituting the antenna group to separately set DL reference signal resources for each antenna group or each antenna point.
   A base station including a receiving unit that receives a measurement result of the DL reference signal resource.

Images