WO2021157035A1

WO2021157035A1 - Terminal, wireless communication method and base station

Info

Publication number: WO2021157035A1
Application number: PCT/JP2020/004670
Authority: WO
Inventors: 祐輝松村; 聡永田; シャオツェングオ; ジンワン
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-02-06
Filing date: 2020-02-06
Publication date: 2021-08-12
Also published as: JPWO2021157035A1

Abstract

A terminal according to an embodiment of the present disclosure comprises: a reception unit that receives at least one of information pertaining to the transition of a plurality of transmission configuration indication (TCI) states that can be utilized for downlink transmissions transmitted from at least one transmission point located on a travel route, information pertaining to intervals respectively corresponding to the plurality of TCIs, and information pertaining to an interval corresponding to the transmission point; and a control unit that controls the reception of downlink transmissions transmitted from the transmission point on the basis of the received information.

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).

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

In future wireless communication systems (for example, NR), transmission points (for example, Remote Radio Head (RRH)) arranged in the path of the mobile body in order to realize wireless communication in a mobile body (for example, a train) moving at high speed )) It is assumed that the beam transmitted from) will be used.

However, how to control wireless communication in a mobile body by using the beam transmitted from each transmission point has not been sufficiently examined.

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 controlling wireless communication in a mobile body.

The terminal according to one aspect of the present disclosure includes information on transitions of a plurality of transmission configuration index (TCI) states that can be used for DL transmission transmitted from one or more transmission points arranged in a movement path, the plurality of TCIs. Controls the reception of DL transmission transmitted from the transmission point based on the receiving unit that receives at least one of the information regarding the period corresponding to each of the above and the information regarding the period corresponding to the transmission point. It is characterized by having a control unit.

According to one aspect of the present disclosure, wireless communication in a mobile body can be appropriately controlled.

1A and 1B are diagrams showing an example of communication between a mobile body and a transmission point (for example, RRH). 2A and 2B are diagrams showing an example of communication control according to the first aspect. 3A and 3B are diagrams showing another example of communication control according to the first aspect. 4A and 4B are diagrams showing another example of communication control according to the first aspect. 5A and 5B are diagrams showing an example of a table showing the distance between RRHs according to the first aspect. 6A and 6B are diagrams showing an example of the correspondence between the TCI state and the beam period according to the first aspect. FIG. 7 is a diagram showing another example of the correspondence between the TCI state and the beam period according to the first aspect. 8A and 8B are diagrams showing an example of communication control according to the second aspect. FIG. 9 is a diagram showing another example of communication control according to the second aspect. FIG. 10 is a diagram showing another example of communication control according to the second aspect. 11A and 11B are diagrams showing another example of communication control according to the second aspect. 12A and 12B are diagrams showing another example of communication control according to the second aspect. 13A and 13B are diagrams showing an example of communication control according to the third aspect. FIG. 14 is a diagram showing an example of beam period switching (transition of TCI state) according to the third aspect. FIG. 15 is a diagram showing another example of beam period switching (TCI state transition) according to the third aspect. FIG. 16 is a diagram showing another example of beam period switching (TCI state transition) according to the third aspect. FIG. 17 is a diagram showing an example of the beam period switching timing according to the third aspect. FIG. 18 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 19 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 20 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 21 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

(HTS)
In NR, a beam transmitted from a transmission point (for example, RRH) in order to communicate with a mobile body such as a train moving at high speed (hereinafter, also referred to as a UE) included in an HTS (high speed train). In an existing system (for example, Rel.15), it is supported to transmit a beam in one direction from the RRH to communicate with a mobile body (see FIG. 1A).

FIG. 1A shows a case where RRHs are installed along a moving path (or moving direction, traveling direction, traveling path) of a moving body, and a beam is formed from each RRH on the traveling direction side of the moving body. The RRH forming a unidirectional beam may be referred to as a uni-directional RRH (uni-directional RRH). In the example shown in FIG. 1A, the moving body undergoes a _{negative Doppler shift (−f D) from each RRH.}

Although the case where the beam is formed on the traveling direction side of the moving body is shown here, the beam may be formed on the opposite direction side to the traveling direction.

Rel. After 16, it is assumed that a plurality of (for example, two or more) beams are transmitted from the RRH. For example, it is assumed that a beam is formed in both the traveling direction of the moving body and the direction opposite to the traveling direction (see FIG. 1B).

FIG. 1B shows a case where RRHs are installed along the movement path of the moving body and beams are formed from each RRH on both the traveling direction side and the opposite direction side of the traveling direction of the moving body. An RRH that forms a beam in a plurality of directions (for example, two directions) may be called a bi-directional RRH (bi-directional RRH).

In the example shown in FIG. 1B, the moving body receives a positive Doppler shift with higher power from a signal that has undergone a negative Doppler shift between two RRHs (here, RRH # 1 and RRH # 2). Switch to a signal. In this case, the maximum change width of the Doppler shift that needs to be corrected is the change _{from −f D} to + f _D , which is twice as large as that in the case of unidirectional RRH.

In the future, it is desired to support communication in a mobile body moving at a speed of 500 km / h or more by using a plurality of RRHs arranged in a movement path (without the assistance of a macro cell).

On the other hand, when the moving body moves at high speed, it is assumed that it will be difficult to properly perform control such as beam control and handover.

For example, beam control of an existing system (for example, before Rel.15) includes, for example, L1-RSRP report, beam notification (TCI state, spatial relation setting, or activation), and reception beam. It is done in the decision procedure. However, it becomes difficult to perform the series of flows (for example, notification of TCI status or QCL assumption) in a short transit period by using the method of the existing system.

Further, the handover control is performed by, for example, the procedure of measurement report (L3-RSRP, L3-SINR report), handover instruction, random access channel transmission, and RRC connection completion, and the series of flows is performed in a short passage period. It will be difficult to do.

(TCI, spatial relationship, QCL)
In the NR, reception processing (for example, reception, demapping, demodulation, etc.) in the UE of at least one of the signal and the channel (expressed as a signal / channel) is based on the transmission configuration indication state (TCI state). Controlling 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 colocation (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.

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 (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.

<TCI state for PDCCH>
Information about the PDCCH (or DMRS antenna port associated with the PDCCH) and the QCL with a given RS may be referred to as the TCI state for the PDCCH and the like.

The UE may determine the TCI state for the UE-specific PDCCH (CORESET) based on the upper layer signaling. For example, for the UE, one or more (K) TCI states may be set by RRC signaling for each CORESET.

The UE may activate one of the plurality of TCI states set by RRC signaling for each CORESET by MAC CE. The MAC CE may be called a TCI state indicating MAC CE (TCI State Indication for UE-specific PDCCH MAC CE) for UE-specific PDCCH. The UE may monitor the CORESET based on the active TCI state corresponding to the CORESET.

<TCI state for PDSCH>
Information about the PDSCH (or DMRS antenna port associated with the PDSCH) and the QCL with a given DL-RS may be referred to as the TCI state for the PDSCH and the like.

The UE may notify (set) M (M ≧ 1) TCI states (QCL information for M PDSCHs) for PDSCH by higher layer signaling. The number M of TCI states set in the UE may be limited by at least one of the UE capability and the QCL type.

The DCI used for scheduling the PDSCH may include a predetermined field indicating the TCI state for the PDSCH (for example, it may be called a TCI field, a TCI state field, or the like). The DCI may be used for scheduling the PDSCH of one cell, and may be called, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1-1-1 and the like.

Whether or not the TCI field is included in the DCI may be controlled by the information notified from the base station to the UE. The information may be information indicating whether or not a TCI field exists in DCI (present or present) (for example, TCI existence information, TCI existence information in DCI, upper layer parameter TCI-PresentInDCI). The information may be set in the UE by, for example, higher layer signaling.

When more than 8 types of TCI states are set in the UE, 8 or less types of TCI states may be activated (or specified) using MAC CE. The MAC CE may be referred to as a UE-specific PDSCH TCI state activation / deactivation MAC CE (TCI States Activation / Deactivation for UE-specific PDSCH MAC CE). The value of the TCI field in DCI may indicate one of the TCI states activated by MAC CE.

When the UE sets the TCI existence information set to "enabled" for the CORESET that schedules the PDSCH (CORESET used for the PDCCH transmission that schedules the PDSCH), the UE is set to the TCI field. It may be assumed that it exists in the DCI format 1-11 of the PDCCH transmitted on the CORESET.

When the TCI existence information is not set for the CORESET that schedules the PDSCH, or the PDSCH is scheduled in the DCI format 1_0, the reception of the DL DCI (DCI that schedules the PDSCH) and the PDSCH corresponding to the DCI If the time offset between the reception of the PDSCH is greater than or equal to the threshold value, the UE uses the TCI state or QCL assumption for the PDSCH to determine the QCL of the PDSCH antenna port for the PDCCH transmission that schedules the PDSCH. It may be assumed that it is the same as the TCI state or QCL assumption applied to.

If the TCI presence information is set to "enabled", the TCI field in the DCI in the component carrier (CC) that schedules (PDSCH) will be in the activated TCI state in the scheduled CC or DL BWP. And if the PDSCH is scheduled in DCI format 1-11, the UE uses a TCI that has a DCI and follows the value of the TCI field in the detected PDCCH to determine the QCL of the PDSCH antenna port. May be good. When the time offset between the reception of the DL DCI (scheduling the PDSCH) and the PDSCH corresponding to the DCI (PDSCH scheduled by the DCI) is greater than or equal to the threshold value, the UE performs the PDSCH of the serving cell. It may be assumed that the DM-RS ports are RSs and QCLs in the TCI state with respect to the QCL type parameters given by the indicated TCI state.

In the RRC connection mode, the DL DCI (PDSCH) is set both when the TCI information in the DCI (upper layer parameter TCI-PresentInDCI) is set to "enabled" and when the TCI information in the DCI is not set. If the time offset between the receipt of the scheduled DCI) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is less than the threshold, the UE will see that the DM-RS port of the PDSCH of the serving cell is in the serving cell. One or more CORESETs in the active BWP have the smallest (lowest) CORESET-ID in the latest (latest) slot monitored by the UE and are in the monitored search space. It may be assumed that the associated CORESET is an RS and a QCL with respect to the QCL parameters used to indicate the PDCCH's QCL. This RS may be referred to as the PDSCH default TCI state or the PDSCH default QCL assumption.

The time offset between the reception of the DL DCI and the reception of the PDSCH corresponding to the DCI may be referred to as a scheduling offset.

The above thresholds are QCL time duration, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset". , Schedule offset threshold, scheduling offset threshold, and the like.

The QCL time length may be based on the UE capability, for example, the delay required for PDCCH decoding and beam switching. The QCL time length may be the minimum time required for the UE to perform PDCCH reception and application of spatial QCL information received in the DCI for PDSCH processing. The QCL time length may be represented by the number of symbols for each subcarrier interval, or may be represented by the time (for example, μs). The QCL time length information may be reported from the UE to the base station as UE capability information, or may be set in the UE from the base station using higher layer signaling.

For example, the UE may assume that the DMRS port of the PDSCH is a DL-RS and QCL based on the TCI state activated for the CORESET corresponding to the minimum CORESET-ID. The latest slot may be, for example, a slot that receives the DCI that schedules the PDSCH.

Note that the CORESET-ID may be an ID set by the RRC information element "ControlResourceSet" (ID for identifying CORESET, controlResourceSetId).

If CORESET is not set for the CC, the default TCI state may be the activated TCI state that is applicable to the PDSCH in the active DL BWP of the CC and has the lowest ID.

The present inventors focused on the transition of the beam (or TCI state, QCL assumption) in the mobile body, examined the communication control between the mobile body (or the UE included in the mobile body) and the RRH, and described the present invention. I came up with an embodiment.

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

TCI state, TCI state or QCL assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, spatial domain filter, UE receive beam, DL receive beam, DL precoding, DL precoder, DL-RS, DMRS The QCL parameters followed by the port, the TCI state or QCL-assumed QCL type D RS, and the TCI state or QCL-assumed QCL type A RS, may be read interchangeably. The QCL type D RS, the DL-RS associated with the QCL type D, the DL-RS having the QCL type D, the DL-RS source, the SSB, and the CSI-RS may be read interchangeably.

In the present disclosure, the TCI state is information about a receive beam (spatial domain receive filter) instructed (set) to the UE (for example, DL-RS, QCL type, cell to which DL-RS is transmitted, etc.). You may. A QCL assumption is based on the transmission or reception of an associated signal (eg, PRACH) and is transmitted by an information (eg, DL-RS, QCL type, DL-RS) about a receive beam (spatial domain receive filter) assumed by the UE. It may be a cell to be used, etc.).

In the present disclosure, the moving body may be any one that moves at a predetermined speed or higher, and may be, for example, a train, a car, a motorcycle, a ship, or the like. Further, communication between the UE included in the mobile body and the transmission point (for example, RRH) may be performed directly between the UE and the transmission point, or the mobile body (for example, an antenna installed on the mobile body). It may be done between the UE and the transmission point via.

Further, in the present disclosure, "A / B" may be read as at least one of A and B, and "A / B / C" may be read as at least one of A, B and C.

(First aspect)
In the first aspect, a case where a UE (for example, a terminal included in a mobile body) controls communication with a transmission point (for example, RRH) based on information about a beam transition will be described.

FIG. 2A shows an example of a case where the moving body communicates with a transmission point (here, RRH # 1 and RRH # 2) arranged in the moving path. Here, a case where each RRH transmits a DL signal / DL channel using a plurality of beams is shown. Each transmission point may be at least one of a unidirectional RRH and a bidirectional RRH.

In the following description, a case where a signal / channel is transmitted from a network (for example, RRH) to a mobile body (for example, UE) (DL transmission) will be described as an example, but UL transmission can also be applied.

The UE may control the reception of DL transmission transmitted from the transmission point based on the information regarding the beam transition. Beam transitions may be read interchangeably with TCI state transitions or QCL transitions. Information about the beam transition may be notified from the network (for example, a base station, a transmission point) to the UE using at least one of RRC signaling and MAC CE, or may be predefined in the specifications.

The information regarding the beam transition includes at least one of the information regarding the transition of the TCI state, the period corresponding to each beam (also referred to as the beam period or the beam time), and the period corresponding to the RRH (also referred to as the RRH period or the RRH time). You may. The period or time may be specified in at least one unit of a symbol, a slot, a subslot, a subframe, and a frame, or may be specified in units of ms or μm. The period or time may be read as distance or angle.

The information regarding the transition of the TCI state (for example, TCI # n → TCI # n + 1) may be the transition / ordering / index of the TCI state. The period corresponding to the beam may be the duration / dwell-time of the beam. The transmission point (RRH) corresponding period may be the duration / dwell-time of the RRH.

The period corresponding to RRH may correspond to the total value of the periods corresponding to each beam in RRH. For example, the UE may acquire the period corresponding to RRH from the period corresponding to each beam. In this case, it is not necessary to notify the UE or predefine the period corresponding to RRH.

The TCI state and each beam period may be associated with each other (see FIG. 2B). FIG. 2B is a diagram showing an example of a table in which the TCI state and each beam period are associated with each beam period index (for example, t0, t1, t2, t3, t4, t5).

Each beam period index (t0, t1, t2, t3, t4, t5) may correspond to a different beam. Further, the beam period index may be changed (or switched, changed, changed, updated) in the order of t0, t1, t2, t3, t4, t5 according to the movement of the moving body (UE).

Here, TCI state # 0 (t0), TCI state # 1 (t1), TCI state # 2 (t2), TCI state # 3 (t3), TCI state # 4 (t4), TCI state # 5 (t5). The case of transitioning in the order of is shown. The UE may control the reception of DL transmission by assuming that the TCI state (or QCL) transitions according to the period corresponding to each beam in the communication with the transmission point (RRH # 1, # 2). (See FIGS. 3A and 3B).

The upper figure of FIG. 3A corresponds to an image diagram considering the geographic domain in communication with RRH # 1, and the lower figure shows the transition of the TCI state in the time direction. Although slot units (slot boundaries) are described here in the time direction, they may be other time units (eg, at least one of symbol, subslot, subframe, frame, ms and μm). FIG. 3B shows an example of a table (or association between the TCI state and the beam period) showing the set beam transitions.

When each beam period expires, the UE may update the TCI state (or QCL assumption) based on the set transition order of the TCI state. For example, in communication with RRH # 1, the UE assumes TCI state # 0 in the corresponding beam period (here, 4), and after the beam period expires, switches to TCI state # 1 and switches to the DL signal / channel. You may control the reception of.

In communication with the transmission point (RRH # 1), the UE may determine the first beam period index (eg, t0) or the start point of the period corresponding to the beam based on predetermined conditions or methods. For example, the UE (or mobile body) may make a judgment based on the current position acquired from GPS or the like, or may make a judgment based on a predetermined signal (for example, a reference signal) transmitted from the transmission point. good.

In this way, the UE can appropriately communicate even when the moving body moves at high speed by controlling the communication with the transmission point based on the information regarding the beam transition.

<Variation 1-1>
The period corresponding to the beam may be the ratio of the period during which each beam is used at the transmission point (eg, Duration ratio, dwell ratio, dwell time ratio) (see FIGS. 4A, 4B). At each transmission point, the UE may control the reception of DL transmissions (eg, determine the assumed TCI state or QCL) based on the percentage of time each beam is used.

The beam period does not have to be notified or set to the UE. In this case, the UE may blindly change (or switch, change, update) the TCI state based on the transition order of the TCI state (or QCL).

<Variation 1-2>
The period corresponding to RRH may be information (for example, Distance / duration) regarding the distance or period between RRHs (for example, RRH # 1 and RRH # 2). For example, the UE may be notified of information about the average distance or average duration between adjacent RRHs (eg, RRH # n and RRH # n + 1) (see FIG. 5A). Here, the case where the average distance between each RRH is indicated by 3 is shown.

Alternatively, information regarding the distance or period between each RRH (for example, for each adjacent RRH) may be notified or set to the UE (see FIG. 5B). When RRH # 1 to RRH # 6 are arranged in the movement path, the UE may control the reception of DL transmission in each RRH based on the information regarding the distance or period between the RRHs. The method described above may be applied to the reception of DL transmission in each RRH.

The UE can appropriately perform communication in each RRH by grasping the relationship between the RRHs. Information regarding the twist or period between RRHs may be notified from the base station to the UE using at least one of RRC signaling and MAC CE, or may be defined in advance in the specifications.

<Variation 1-3>
The UE may be controlled to detect a predetermined TCI state from a plurality of TCI states (for example, blind detect) in a certain beam period. For example, when the TCI state corresponding to the beam period t is #i, the TCI state #i and other TCI states may be detected in the beam period t. The other TCI state may be one or more TCI states that transition before or after the TCI state #i. The TCI state #i and other TCI states may be included in a predetermined window (eg, a blind detection window).

FIG. 6A shows a case where the TCI state is blindly detected from the TCI state # 1 corresponding to the t1 and the TCI states # 0 and # 2 transitioned before and after the TCI state # 1 in the beam period t1. There is. That is, it corresponds to the case where the blind detection window includes TCI states # 1, # 2, and # 3. The range or size of the blind detection window (eg, the range or size of rows, indexes, TCI states) may be set from the network or may be predefined.

As a result, even if there is a deviation between the beam period (or TCI state) assumed by the UE and the actual position, it is possible to communicate with the transmission point based on an appropriate TCI state or QCL assumption.

<Variation 1-4>
Multiple TCI states may correspond to each beam period (see FIG. 6B). Here, a case where two or more TCI states correspond to each beam period is shown. The UE may detect a predetermined (eg, one) TCI state (eg, blindly) from a plurality of TCI states during each beam period.

For example, the UE determines one TCI state from TCI states # 0 and # 1 in the beam period t0. The determination of the TCI state may be performed based on the reception status (for example, received power, etc.) when each TCI state is used.

<Variation 1-5>
If a plurality of TCI states correspond to each beam period (see FIG. 6B), the UE may detect one or more TCI states depending on the UE capability. For example, when the UE supports the ability to simultaneously receive DL transmissions transmitted from a plurality of transmission points (multi-panel simultaneous reception), the UE may detect two TCI states and perform reception processing.

In this way, by associating a plurality of TCI states with each other for the beam period, it is possible to simultaneously receive DL transmissions transmitted from a plurality of transmission points.

<Variation 1-6>
A plurality of TCI state candidates corresponding to each beam period may be set, and the TCI state to be actually applied (or assumed) may be determined based on predetermined conditions (see FIG. 7). Here, a case is shown in which two TCI states corresponding to each beam period are set. For example, a plurality of TCI state transition lists corresponding to each beam period may be set, and a list to be actually used may be selected from the plurality of lists.

The TCI status list may be set from the network to the UE using at least one of higher layer signaling and MAC CE, or may be predefined in the specifications. The UE may determine one list out of a plurality of lists based on downlink control information (DCI) or PDCCH. For example, the TCI list may be specified using a new bit field or an existing bit field included in DCI. Alternatively, the TCI list may be selected based on the DCI position and resources (eg, CCE / PRB / RE index) detected by the UE.

When a TCI state (or TCI state list) is specified using the new bit feed of DCI, the size (for example, the number of bits) of the new bit field is set to the TCI state (or TCI state list). It may be determined based on the number of.

If one TCI state corresponds to each beam period, the new bit field is unnecessary (not included in DCI). A new bitfield may be included in the DCI if multiple TCI states correspond to at least one of each beam period.

In this way, by selecting and using one TCI list from a plurality of TCI status lists, it is possible to flexibly set the beam (or TCI status) used for communication with each RRH.

(Second aspect)
In the second aspect, a case where the UE determines the TCI state applied to or assumed to receive the DL transmission separately for each signal / channel type or type will be described.

In the following description, a case where the TCI state applied to or assumed to be received by PDCCH and the TCI state applied to or assumed to be received by PDSCH are determined separately will be described. In addition, any of the methods shown below may be applied to other DL signals / channels.

<TCI state of PDCCH>
The UE may determine the TCI state of the PDCCH by applying the first aspect (for example, beam transition information). The beam transition information may be set separately for each control resource set (CORESET). Alternatively, the beam transition information may be set in common for a plurality of control resource sets (CORESET).

<TCI state of PDSCH>
The UE may determine the TCI state of the PDSCH by applying a method different from that of the PDCCH.

For example, a plurality of TCI states may be set for each beam period (see FIGS. 8A and 8B). Here, the case where the TCI state list is set separately for each beam period is shown. Each TCI state list may include a plurality of (here, 8 (3 bits)) TCI states. The size of the TCI state list set for each beam period (eg, the number of TCI states included in the list) may be the same or different.

The TCI state list (or one or more TCI states) corresponding to each beam period may be set in the UE using at least one of higher layer signaling and MAC CE, or may be defined in the specification. good. The TCI state may be set separately for each beam period, or the activation / deactivation of the TCI state set for each beam period may be notified.

Further, when the TCI state list is set to one beam period, the TCI state list may be applied to another beam period (for example, all beam periods).

One or more TCI states included in the TCI state list may be associated with a code point (for example, a bit value) of a predetermined field of DCI. When the received DCI (or PDCCH) includes a predetermined field, the UE may determine the TCI state to be applied in the beam period for receiving the PDSCH based on the code point of the predetermined field.

Whether or not a predetermined field is included in DCI may be notified by upper layer signaling. For example, when the UE is set with a higher layer parameter (eg, tciPresentInDCI) indicating that the DCI contains a predetermined field (eg, TCI field), the UE is notified of the TCI status of the PDSCH in the predetermined field of DCI. You may assume.

The UE is based on a method other than the predetermined field (eg, predetermined condition or information) if the upper layer parameter (eg, tciPresentInDCI) indicating that the DCI includes a predetermined field (eg, TCI field) is not set. The TCI state of the PDSCH may be determined.

For example, when the DCI does not include a predetermined field, the UE may determine the TCI state to be used for receiving the PDSCH based on the default TCI state or the default QCL assumption (hereinafter, also referred to as the default TCI state). The default TCI state may be the TCI state corresponding to a given control resource set (eg, a given control resource set in the period or slot where the PDSCH is scheduled). A given control resource set may be the control resource set with the smallest index.

FIG. 9 shows a case where PDSCH is received using the default TCI state in each beam period. The default TCI state may be the TCI state corresponding to a predetermined set of control resources corresponding to each beam period.

Alternatively, the default TCI state may be the TCI state corresponding to a predetermined control resource set in the last monitored slot (for example, latest monitoring slot). A given control resource set may be the control resource set with the smallest index. Further, the control resource set may be read as a search space.

The default TCI state may be changed (or updated) for each beam period as shown in the first aspect.

Alternatively, if the DCI does not include a predetermined field, the UE may control PDSCH reception by applying or assuming a default TCI state corresponding to the predetermined beam period in a plurality of beam periods. The predetermined beam period may be the beam period with the smallest index (see FIG. 10). Here, a case is shown in which TCI state # 1 corresponding to the beam period (t0) having the smallest index is applied or assumed in a plurality of beam periods (t0 to t5).

If the control resource set does not exist (or the UE cannot be detected) in the slot where the PDSCH is scheduled, the TCI state corresponding to the control resource set last monitored by the UE is selected as the TCI state for the PDSCH. May be good. That is, the UE determines that the TCI state corresponding to the control resource set in the last monitoring occasion is the default TCI state (see FIG. 11A).

In FIG. 11A, the UE cannot detect the control resource set (or search space) in the slot where the PDSCH is scheduled. Therefore, the TCI state (here, TCI state # 1) corresponding to the control resource set last monitored by the UE is selected as the TCI state (default TCI state) for PDSCH.

Alternatively, if the control resource set does not exist (or the UE cannot be detected) in the slot where the PDSCH is scheduled, the TCI state corresponding to the slot (or symbol) in which the PDSCH is scheduled is set as the TCI state for the PDSCH. It may be selected (see FIG. 11B).

In FIG. 11B, the UE cannot detect the control resource set (or search space) in the slot where the PDSCH is scheduled. Therefore, the TCI state (here, TCI state # 2) of the beam period corresponding to the slot (or symbol) where the PDSCH is scheduled is selected as the TCI state (default TCI state) for the PDSCH. When there are a plurality of TCI states in the beam period corresponding to the slot (or symbol) in which the PDSCH is scheduled, a predetermined TCI state (for example, the TCI state having the smallest index) may be selected.

Alternatively, if the control resource set does not exist (or the UE cannot be detected) in the slot where the PDSCH is scheduled, the TCI state corresponding to the symbol for which the PDSCH is scheduled may be selected as the TCI state for the PDSCH. (See FIGS. 12A and 12B).

FIG. 12A shows the case where the TCI state corresponding to at least one of the first symbol and the last symbol (here, the first symbol) for which PDSCH is scheduled is selected. Specifically, the UE may select the TCI state (here, TCI state # 2) of the beam period corresponding to the first symbol to which the PDSCH is scheduled as the TCI state (default TCI state) for the PDSCH. good. The first symbol on which the PDSCH is scheduled may be read as the first symbol on which the demodulation reference signal (DMRS) for the PDSCH is arranged.

In FIG. 12B, the TCI states (here, TCI states # 2 and # 3) of the beam period corresponding to each symbol for which the PDSCH is scheduled are selected as the TCI states (default TCI states) for the PDSCH. That is, PDSCH is received in consideration of a plurality of TCI states in the time direction. By receiving the PDSCH in consideration of a plurality of TCI states, the PDSCH can be received more appropriately.

Note that the symbol on which the PDSCH is scheduled may be read as the symbol on which the demodulation reference signal (DMRS) for the PDSCH is arranged. In this case, when a plurality of DMRSs are included in the PDSCH, the reception of the PDSCH may be controlled in consideration of the TCI state corresponding to each DMRS symbol.

The second aspect may be applied to UL transmission. In this case, the PDSCH default TCI state (or QCL assumption) may be read as the PUCCH reference signal (for example, PL-RS), SRS, or PUSCH default spatial relation.

(Third aspect)
In the third aspect, the UE operation when the information regarding the beam period is not notified (for example, only the information regarding the transition of the TCI state is notified as the beam transition information) will be described. The beam period may be read as a transition period of the TCI state, a switching period of the TCI state, or a continuation period of the TCI state.

If the information about the beam period (eg, the value of each beam period) is not notified, the UE may blindly detect at least one of each beam period and each RRH period. For example, the UE acquires each beam period based on a predetermined signal / predetermined condition / predetermined information, and DL transmission is performed based on the acquired beam period and the transition order of the TCI state defined in the notification or specification from the network. Reception may be controlled (see FIGS. 13A, 13B).

FIG. 13B shows an example of information regarding the beam transition notified to the UE (for example, transition information of the TCI state). The UE may determine the beam period or RRH period to which each TCI state corresponds based on at least one of the following options 1-4.

<Option 1>
The UE may determine each beam period based on a predetermined signal (or a resource for the predetermined signal). The predetermined signal may be a reference signal (DL RS). The reference signal may be at least one of a sync signal block, CSI-RS, TRS, PT-RS, and DMRS.

For example, the UE sets a beam period / RRH period (hereinafter, also referred to as a beam period) based on a reference signal resource (for example, a predetermined frequency resource) or a measurement result of a reference signal transmitted using the reference signal resource. You may judge. One (or common) reference signal resource may be set for multiple beam periods (see FIG. 14). The UE may determine the reference signal resource to be set based on the information of the reference signal resource configuration notified from the network.

FIG. 14 shows a case where one reference signal resource (for example, a resource to which the same frequency and period are applied) is set in a plurality of beam periods. Reference signal resources may be periodically / semi-persistent / aperiodically set / triggered / activated.

The UE may measure or monitor the set reference signal resource and determine the beam period (or the transition period of the TCI state) based on the measurement result or the monitor result. For example, the UE may compare the measurement results of each reference signal resource and determine the range of each beam period based on the difference in measurement results between different reference signal resources. The measurement result or monitor result may be at least one of received power (RSRP), received quality (RSRQ), and received channel quality (SINR).

If the difference in measurement results of different reference signal resources (for example, reference signal resources adjacent in the time direction) is less than or equal to a predetermined value, the UE belongs to the same beam period (or has a TCI state) between the reference signal resources. It may be determined that the transition is not performed). On the other hand, if the difference in measurement results of different reference signal resources is greater than a predetermined value, the UE may determine that each reference signal resource belongs to a different beam period (or the TCI state is transitioned). A predetermined value as a criterion for determining the measurement result may be defined in the specifications or may be notified to the UE from the network.

In FIG. 14, since the measurement result of the reference signal resource transmitted in the beam period corresponding to TCI # 0 and the measurement result of the reference signal resource transmitted in the period corresponding to TCI # 1 are larger than the predetermined values, the UE Can grasp the period corresponding to each TCI state based on the measurement result.

<Option 2>
Option 1 shows a case where a common reference signal resource (or reference signal resource configuration) is set in a period corresponding to a plurality of TCI states (for example, a plurality of beam periods), but the present invention is not limited to this. Different reference signal resources (or reference signal resource configurations) may be set or used for the period corresponding to each TCI state (eg, each beam period) (see FIG. 15).

FIG. 15 shows a case where reference signal resources (here, three different reference signal resource configurations) corresponding to the number of beam periods (here, three) are set. The different reference signal resources may be, for example, three reference signal resources having different frequency domains.

The UE measures RSRP / RSRQ / SINR of each reference signal resource at the set measurement instance / time, and the beam is based on the resource index that can detect / measure / receive the reference signal at each measurement opportunity. The period (or transition of the TCI state) may be determined. The UE may determine that the reference signal is transmitted in the reference signal resource whose measurement result is larger than the predetermined value among the plurality of reference signal resources.

In FIG. 15, when the UE detects the reference signal in the first reference signal resource (RS resource # 1), it may determine that the beam period (for example, t0) corresponds to TCI # 0. Similarly, when the UE detects the reference signal in the second reference signal resource (RS resource # 2), it determines that the beam period corresponds to TCI # 1 (for example, t1), and determines that the third reference signal is in use. When the reference signal is detected by the resource (RS resource # 3), it may be determined that the beam period corresponds to TCI # 2 (for example, t2).

The base station may control not to transmit a plurality of reference signals using different reference signal resources in the same time interval (for example, at least one of the same symbol, subslot, slot, slot, and frame). .. The UE may assume that multiple reference signals utilizing different reference signal resources are not transmitted in the same time interval (eg, at least one of the same symbol, subslot, slot, slot, and frame).

<Option 3>
Option 2 shows a case where reference signal resources (here, three different reference signal resource configurations) corresponding to the number of beam periods (here, three) are set, but the present invention is not limited to this. The number of reference signal resources (or reference signal resource configurations) set may be less than the number of beam periods.

For example, two reference signal resources may be set for a plurality of beam periods (or a plurality of transitioning TCI states). In this case, different reference signal resources may be applied (or reference signals are placed in different reference signal resources) for adjacent beam periods (see FIG. 16).

FIG. 16 shows a case where two reference signal resources (RS resources # 1 and # 2) are set in a plurality of beam periods (or TCI states) and different RS resources are applied in adjacent beam periods. There is.

When the reference signal can be detected by the first reference signal resource (RS resource # 1), the UE may determine that the beam period corresponds to TCI # 0 (for example, t0). Subsequently, when the UE can detect the reference signal in the second reference signal resource (RS resource # 2) instead of the first reference signal resource, TCI # 0 (for example, t0) to TCI # 1 (for example, for example). It may be determined that the transition to t1) has occurred. Subsequently, the UE transitioned from TCI # 1 (for example, t1) to TCI # 2 (for example, t2) when the reference signal could be detected by the first reference signal resource instead of the second reference signal resource. You may judge.

In this way, by reducing the number of reference signal resources from the number of beam periods (or the number of transitions in the TCI state), the beam period (or TCI state) is detected by utilizing the smaller number of reference signal resources. be able to. As a result, resource utilization efficiency can be improved.

<Option 4>
The switching (or change) of the beam period corresponding to each TCI state may be notified to the UE using DCI. For example, a new field included in the DCI (eg, duration / QCL change indicator field) may be used to notify the UE of beam period switching, or an existing bit field in the DCI (eg, DCI's existing bitfield). For example, the reserved bit field may be used to notify the UE of the switching of the beam period.

Alternatively, the UE may be notified of beam period switching based on the type of RNTI corresponding to DCI (eg, RNTI used for CRC scrambling) and at least one of the DCI formats.

Alternatively, the UE may determine the beam period switching based on at least one of the detected DCI positions and resources. At least one of the DCI positions and resources may be at least one of the CCE index, PRB index, resource element index, search space index, and CORESETID.

<Switching timing>
When the UE switches or updates the beam period (or TCI state / QCL assumption) based on at least one of options 1 to 4, the switching timing (Timing / timeline) of the beam period is the following timings 1 to 1. It may be controlled based on at least one of 4 (see FIG. 17).

<Timing 1>
When the UE detects a different TCI state (or transition of the TCI state) based on the reference signal resource, the UE switches the TCI state (or beam period) based on the reference signal resource (or symbol). You may. In this case, the transition of the TCI state can be performed quickly.

<Timing 2>
When the UE detects a different TCI state (or TCI state transition) based on the reference signal resource, it switches the TCI state (or beam period) based on the next reference signal resource (or symbol). You may go. In this case, the processing time can be secured for the UE to perform the switching processing.

<Timing 3>
When the UE detects a different TCI state (or TCI state transition) based on the reference signal resource, at least the slot boundary, subslot boundary, and subframe boundary containing the reference signal resource (or symbol). The TCI state (or beam period) may be switched based on one. In this case, the transition of the TCI state can be performed quickly.

<Timing 4>
When the UE detects a different TCI state (or TCI state transition) based on the reference signal resource, the next slot boundary, subslot boundary, and subframe boundary containing the reference signal resource (or symbol) The TCI state (or beam period) may be switched based on at least one of the above. In this case, the processing time can be secured for the UE to perform the switching processing.

(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. 18 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 between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). 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 (for example, RRH) 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. In addition, Master Information Block (MIB) may be transmitted by 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 to detect PDCCH. 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 (for example). 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. 19 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 transform, 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 transmitting unit and the receiving 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 relates to information on transitions of a plurality of transmission configuration index (TCI) states that can be used for DL transmission transmitted from one or more transmission points arranged in a movement path, and a period corresponding to each of the plurality of TCIs. At least one of the information and the information about the period corresponding to the transmission point may be transmitted.

The transmission / reception unit 120 may transmit information regarding a plurality of transmission configuration index (TCI) state transitions that can be used for DL transmission transmitted from one or more transmission points arranged on the movement path.

The control unit 110 may control the TCI state used for DL transmission based on the transition of the TCI state.

The control unit 110 may control the transmission of at least one of the plurality of DL reference signals and the downlink control information used for identifying the period corresponding to each of the plurality of TCI states.

(User terminal)
FIG. 20 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-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.

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

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

The transmission / reception unit 220 relates to information on transitions of a plurality of transmission configuration index (TCI) states that can be used for DL transmission transmitted from one or more transmission points arranged in a movement path, and a period corresponding to each of the plurality of TCIs. At least one of the information and the information about the period corresponding to the transmission point may be received.

The transmission / reception unit 220 may receive information regarding a plurality of transmission configuration index (TCI) state transitions that can be used for DL transmission transmitted from one or more transmission points arranged on the movement path.

The control unit 210 may control the reception of the DL transmission transmitted from the transmission point based on the received information. For example, the control unit 210 may control to change the assumption of the TCI state for DL transmission when at least one of the period corresponding to each of the plurality of TCIs and the period corresponding to the transmission point expires. Further, the control unit 210 controls reception of some DL transmissions based on the received information, and is based on the TCI state or the default TCI state notified by the downlink control information for other DL transmissions. You may control the reception. A separate list of TCI states may be set for each period corresponding to the plurality of TCIs.

The control unit 210 may determine the period corresponding to each of the plurality of TCI states based on at least one of the plurality of DL reference signals and the downlink control information. A plurality of DL reference signals may be transmitted using a common resource. The plurality of DL reference signals may be transmitted using different resources for each period corresponding to the plurality of TCI states. The control unit 210 may determine the period corresponding to each of the plurality of TCI states based on the difference between the measurement results of the plurality of reference signals and at least one of the resources used for the plurality of reference signals.

(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, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 21 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, for example, 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. The PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as 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, mini slots, 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. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

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

A resource block (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, etc.) 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 the number of RBs. 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 another method. 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, executables, 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, an uplink channel, a downlink 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), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), LTE 802. 20, Ultra-WideBand (UWB), Bluetooth®, other systems utilizing appropriate wireless communication methods, next-generation systems extended based on these, and the like may be applied. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

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

Any reference to elements using designations such as "first" 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 terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection or connection 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

Information on the transition of a plurality of transmission configuration index (TCI) states that can be used for DL transmission transmitted from one or more transmission points arranged on the movement path, information on the period corresponding to each of the plurality of TCIs, and the above-mentioned A receiver that receives at least one piece of information about the period corresponding to the transmission point,
A terminal having a control unit that controls reception of DL transmission transmitted from the transmission point based on the received information.
1. The control unit changes the assumption of the TCI state for the DL transmission when at least one of the period corresponding to the plurality of TCIs and the period corresponding to the transmission point expires. The terminal described in.
The control unit controls reception of some of the DL transmissions based on the received information, and based on the TCI state or the default TCI state notified by the downlink control information for the other DL transmissions. The terminal according to claim 1 or 2, wherein the reception is controlled.
The terminal according to any one of claims 1 to 3, wherein a separate list of TCI states is set for each period corresponding to the plurality of TCIs.
Information on the transition of a plurality of transmission configuration index (TCI) states that can be used for DL transmission transmitted from one or more transmission points arranged on the movement path, information on the period corresponding to each of the plurality of TCIs, and the above-mentioned The process of receiving at least one piece of information about the period corresponding to the transmission point, and
A wireless communication method comprising a step of controlling reception of DL transmission transmitted from the transmission point based on the received information.
Information on the transition of a plurality of transmission configuration index (TCI) states that can be used for DL transmission transmitted from one or more transmission points arranged on the movement path, information on the period corresponding to each of the plurality of TCIs, and the above-mentioned A transmitter that transmits at least one piece of information about the period corresponding to the transmission point,
A base station including a control unit that controls the TCI state used for the DL transmission based on the transition of the TCI state.