Terminal, wireless communication method and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a receiving unit for receiving information indicating multiple transmission setting indication states, i.e., multiple TCI states, of the same demodulation reference signal port, i.e., DMRS port, for receiving a physical downlink shared channel, i.e., PDSCH; and a control unit for using the multiple TCI states in receiving multiple PDSCHs carrying the same downlink data. According to one embodiment of the present disclosure, downlink data from multiple transmission points can be appropriately received.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. Background Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (for example, also referred to as fifth generation mobile communication system (5G), 5G+(plus), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall Description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), in order to realize wireless communication in a high-speed moving object (e.g., a train, etc.), it is envisaged to use a beam transmitted from a transmission point (e.g., a remote radio head (RRH)) set on a path of the moving object.

[0009] However, there has been insufficient research on how a terminal receives downlink data transmitted from a plurality of transmission points. If such an operation is not clear, there is a concern that throughput may be reduced.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately receive downlink data from a plurality of transmission points.

[0011] Means for solving problems

[0012] A terminal involved in one embodiment of the present disclosure comprises: a receiving unit, which receives information indicating multiple transmission setting indication states, i.e., multiple TCI states, of the same demodulation reference signal port, i.e., DMRS port, for receiving a physical downlink shared channel, i.e., PDSCH; and a control unit, which uses the multiple TCI states in the reception of multiple PDSCHs carrying the same downlink data.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, downlink data from a plurality of transmission points can be appropriately received. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A as well as Figure 1B This is a diagram showing an example of communication between a mobile object and a transmission point (for example, RRH).

[0016] Figure 2A as well as Figure 2B This is a diagram showing an example of PDSCHs from a plurality of RRHs.

[0017] Figure 3 It is a diagram showing an example of the extended TCI state activation / deactivation MAC CE for UE-specific PDSCH.

[0018] Figure 4A-4C This is a diagram showing an example of resource allocation for two PDSCHs.

[0019] Figure 5 This is a diagram showing an example of a method for determining TDRA / FDRA.

[0020] Figure 6 This is a diagram showing an example of scheduling method 4.

[0021] Figure 7 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0022] Figure 8 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0023] Fig. 9 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0024] Fig.10 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0025] (HST)

[0026] In NR, in order to communicate with a terminal (hereinafter also referred to as UE) included in a high-speed train (HST (high speed train)), it is assumed that a beam transmitted from a transmission point (for example, RRH) is used. In existing systems (for example, Rel.15), it is supported to transmit a beam in one direction from the RRH to communicate with the mobile body (see Figure 1A ).

[0027] exist Figure 1A In FIG. 1 , it is shown that RRHs are arranged along the moving path (or moving direction, traveling direction, driving path) of a moving body, and beams are formed from each RRH toward the moving direction of the moving body. An RRH that forms a beam in one direction may also be called a uni-directional RRH. Figure 1A In the example shown, the mobile object receives a negative Doppler shift (-f D ).

[0028] Here, the case where the beam is formed on the moving direction side of the moving body is shown, but the present invention is not limited to this, and the beam may be formed on the opposite direction to the moving direction, or the beam may be formed in all directions regardless of the moving direction of the moving body.

[0029] In Rel. 16 and later, it is also assumed that multiple (for example, two or more) beams are transmitted from the RRH. For example, it is assumed that beams are formed for both the moving direction of the mobile body and the direction opposite to the moving direction (see Figure 1B ).

[0030] exist Figure 1B , it is shown that RRHs are arranged along the moving path of the moving body, and beams are formed from each RRH to both the moving direction side and the opposite direction side of the moving direction of the moving body. RRHs that form beams in multiple directions (for example, two directions) may also be called bidirectional RRHs.

[0031] exist Figure 1BIn the example shown, the mobile object switches from receiving a negative Doppler shift signal to receiving a positive Doppler shift signal with a higher power between two RRHs (RRH #1 and RRH #2). In this case, the maximum Doppler shift change range that needs to be corrected is from -f D To +f D The change is twice as much as that in the case of unidirectional RRH.

[0032] In the future, it is expected that communications in a moving body moving at a speed of 500 km / h or more will be supported by using a plurality of RRHs arranged on a moving path (without assistance from a macro cell).

[0033] On the other hand, when the mobile object moves at high speed, it is expected to be difficult to appropriately perform control such as beam steering and switching.

[0034] For example, beam control in existing systems (e.g., before Rel. 15) is performed through a process such as L1-RSRP reporting, beam notification (TCI state, spatial relation setting or activation), and reception beam determination. However, it is difficult to perform this series of processes (e.g., TCI state notification or QCL assumption, etc.) within a short pass period using the methods of existing systems.

[0035] In addition, switching control is performed through the process of, for example, measurement reporting (L3-RSRP, L3-SINR reporting), switching instructions, random access channel transmission, and RRC connection completion, but it is difficult to perform this series of processes within a short passing period.

[0036] (TCI, spatial relationship, QCL)

[0037] In NR, research is being conducted to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and coding) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the transmission configuration indication state (Transmission Configuration Indication state (TCI state)).

[0038] The TCI state may also represent the state of a signal / channel applied to a downlink. A state equivalent to the TCI state of a signal / channel applied to an uplink may also be expressed as a spatial relation.

[0039] The TCI state is information related to Quasi-Co-Location (QCL) of signals / channels, and may also be referred to as spatial reception parameters, spatial relationship information, etc. The TCI state may be set for each channel or each signal to the UE.

[0040] QCL is an indicator of the statistical properties of a signal / channel. For example, it may also mean that when a certain signal / channel is in a QCL relationship with other signals / channels, it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same among these different signals / channels (at least one of them is QCL).

[0041] In addition, the spatial reception parameter may also correspond to a reception beam of the UE (eg, a reception analog beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be replaced by sQCL (spatial QCL).

[0042] Regarding QCL, multiple types (QCL types) may also be specified. For example, four QCL types AD may be set, and the parameters (or parameter sets) that can be assumed to be the same in the four QCL types AD are different. The parameters (also referred to as QCL parameters) are expressed as follows:

[0043] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0044] QCL type B (QCL-B): Doppler shift and Doppler spread,

[0045] QCL Type C (QCL-C): Doppler shift and average delay,

[0046] QCL type D (QCL-D): spatial reception parameters.

[0047] The situation in which the UE assumes that a certain control resource set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals can also be called QCL assumption.

[0048] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0049] The TCI state may be, for example, information related to the QCL between the channel being the object (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI state may also be set (indicated) by high-layer signaling, physical layer signaling, or a combination thereof.

[0050] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0051] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0052] In addition, the RS that is in a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called QRS).

[0053] 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 also be referred to as an SS / PBCH block.

[0054] The RS of QCL type X in the TCI state may also mean an RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0055] (Path loss RS)

[0056] Path loss PL under transmission power control of each of PUSCH, PUCCH, and SRS b,f,c (q d )[dB] is the index q of the reference signal (RS, PathlossReferenceRS) for the downlink BWP associated with the activated UL BWP b of carrier f of serving cell c used by the UE d In the present disclosure, path loss reference RS, pathloss(PL)-RS, index q d , RS used in path loss calculation, RS resources used in path loss calculation may also be replaced with each other. In the present disclosure, calculation, estimation, measurement, and tracking (tracking) may also be replaced with each other.

[0057] It is being studied whether to update the existing mechanism of higher layer filtered RSRP (higher layer filtered RSRP) used for path loss measurement when the path loss RS is updated through MAC CE.

[0058] In the case where the path loss RS is updated through the MAC CE, the path loss measurement based on L1-RSRP may also be applied. The high-layer filter RSRP may also be used for path loss measurement at an available timing after the MAC CE for the update of the path loss RS, and the L1-RSRP may be used for path loss measurement before the high-layer filter RSRP is applied. The high-layer filter RSRP may also be used for path loss measurement at an available timing after the MAC CE for the update of the path loss RS, and before this timing, the high-layer filter RSRP of the previous path loss RS is used. Similar to the operation of Rel.15, the high-layer filter RSRP may also be used for path loss measurement, and the UE may also track (track) all path loss RS candidates set through RRC. The maximum number of path loss RSs that can be set through RRC may also depend on the UE capability. In the case where the maximum number of path loss RSs that can be set through RRC is X, path loss RS candidates below X may also be set through RRC, and the path loss RS is selected from the set path loss RS candidates through MAC CE. The maximum number of path loss RSs that can be set through RRC can also be 4, 8, 16, 64, etc.

[0059] In the present disclosure, high-layer filter RSRP, filtered RSRP, and layer 3 filter RSRP (layer 3 filtered RSRP) may also be interchangeable.

[0060] (Default TCI status / Default spatial relationship / Default PL-RS)

[0061] In RRC connection mode, in both the case where the TCI information in the DCI (high-layer parameter TCI-PresentInDCI) is set to "valid (enabled)" and the case where the TCI information in the DCI is not set, when the time offset between the reception of the DL DCI (DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is less than the threshold (timeDurationForQCL) (application condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) may also be the TCI state of the lowest CORESET ID in the latest time slot in the activated DL BWP of the CC (specific UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may also be the TCI state of the lowest TCI state ID of the PDSCH in the activated DL BWP of the scheduled CC.

[0062] In Rel. 15, separate MAC CEs for activation / deactivation of PUCCH spatial relation and MAC CE for activation / deactivation of SRS spatial relation are required. PUSCH spatial relation follows SRS spatial relation.

[0063] In Rel. 16, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relationship and the MAC CE for activation / deactivation of the SRS spatial relationship may not be used.

[0064] When both the spatial relationship and PL-RS for PUCCH are not set in FR2 (application condition, second condition), the default assumption of spatial relationship and PL-RS (default spatial relationship and default PL-RS) is applied to PUCCH. When both the spatial relationship and PL-RS for SRS (SRS resources for SRS or SRS resources corresponding to SRI in DCI format 0_1 ​​that schedules PUSCH) are not set in FR2 (application condition, second condition), the default assumption of spatial relationship and PL-RS (default spatial relationship and default PL-RS) is applied to PUSCH and SRS scheduled by DCI format 0_1.

[0065] In the case where CORESET is set in the activated DL BWP on the CC, the default spatial relationship and default PL-RS may also be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in the activated DL BWP. In the case where CORESET is not set in the activated DL BWP on the CC, the default spatial relationship and default PL-RS may also be the activated TCI state with the lowest ID of the PDSCH in the activated DL BWP.

[0066] In Rel.15, the spatial relationship of the PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID in the activated spatial relationship of the PUCCH on the same CC. Even if no PUCCH is transmitted on the SCell, the network needs to update the PUCCH spatial relationship on all SCells.

[0067] In Rel.16, the PUCCH setting for the PUSCH scheduled by DCI format 0_0 is not required. In the case where there is no activated PUCCH spatial relationship or no PUCCH resources on the activated UL BWP within the CC for the PUSCH scheduled by DCI format 0_0 (application condition, second condition), the default spatial relationship and default PL-RS are applied in the PUSCH.

[0068] The above-mentioned threshold may also be referred to as the time length for QCL (duration (time duration)), "timeDurationForQCL", "threshold (Threshold)", "threshold for offset between aDCI indicating a TCIstate and a PDSCH scheduled by the DCI" (Threshold for offset between aDCI indicating a TCIstate and a PDSCH scheduled by the DCI)", "Threshold-Sched-Offset", scheduling (schedule) offset threshold, scheduling (scheduling) offset threshold, etc.

[0069] (Multiple TRP)

[0070] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi TRP (multi TRP (MTRP))) using one or more panels (multi-panels) to perform DL transmission to the UE is being studied. In addition, the UE is studying the use of one or more panels to perform UL transmission to one or more TRPs.

[0071] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0072] Multiple TRPs (for example, TRP#1, #2) can also be connected through an ideal / non-ideal backhaul and exchange information, data, etc. Different code words (CW) and different layers can also be sent from each TRP of the multiple TRPs. As a method of sending multiple TRPs, non-coherent joint transmission (NCJT) can also be used.

[0073] In NCJT, for example, TRP#1 performs modulation mapping and layer mapping on a first codeword, and uses a first precoding to send a first PDSCH for a first number of layers (e.g., two layers). In addition, TRP#2 performs modulation mapping and layer mapping on a second codeword, and uses a second precoding to send a second PDSCH for a second number of layers (e.g., two layers).

[0074] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may also be defined to partially or completely overlap with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may also overlap.

[0075] It is also conceivable that the first PDSCH and the second PDSCH are not in a quasi-co-location (QCL) relationship (not quasi-co-located). The reception of multiple PDSCHs may also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (eg, QCL type D).

[0076] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI, single PDCCH) (single-primary mode). Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multiple DCIs, multiple PDCCHs) (multiple-primary mode).

[0077] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0078] In order to support the transmission of multiple TRPs within a cell (intra-cell, with the same cell ID) and between cells (inter-cell, with different cell IDs) based on multiple PDCCHs, in the RRC setting information for linking multiple pairs of PDCCH and PDSCH with multiple TRPs, a control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) can also correspond to one TRP.

[0079] (HST-SFN scenario)

[0080] Extensions of support for HST-single frequency network (SFN) configuration scenarios such as the following are being studied.

[0081] • Operation of QCL assumptions for DMRS (e.g., multiple QCL assumptions for the same DMRS port for the purpose of transmitting DL only).

[0082] ·QCL or QCL-like relationships between DL and UL signals (including applicable QCL types and associated requirements) are reused through the unified TCI framework based on the extension of HST in Rel.16.

[0083] The required time between two TRP / RRH / antennas (distance 200, 300m) and between two beams (64 beams are assumed for each TRP / RRH / antenna) is as follows.

[0084] For a distance of 200 m, the required time between two TRPs is 1.44 s and the required time between two beams is 22.5 ms.

[0085] For a distance of 300 m, the required time between two TRPs is 2.16 s and the required time between two beams is 33.75 ms.

[0086] According to the calculated time scale, there is sufficient time for beam switching regarding the change of TCI status (beam) based on DCI for PDSCH, and there is also sufficient time for the change of TCI status based on MAC CE for PDCCH.

[0087] The following beam switching notification framework for the existing PDCCH / PDSCH can basically be reused.

[0088] Indication / update of TCI status for PDSCH based on RRC, MAC CE and DCI.

[0089] Indication / update of TCI status for PDCCH / PDSCH based on RRC and MAC CE.

[0090] In Rel.16, for the antenna port field of DCI format 1_1, a new DMRS table (new antenna port indication table) is specified for sending multiple PDSCHs (multiple TRPs) based on a single DCI.

[0091] In the case of two TCI states within the code point indicated by the DCI field "Transmission Configuration Indication" and DM-RS ports within two code division multiplexing (CDM) groups within the DCI field "antenna port", the first TCI state corresponds to the CDM group of the first antenna port indicated by the antenna port indicator table, and the second TCI state corresponds to the other CDM groups.

[0092] In multiple PDSCH transmission based on a single DCI, the TCI field in the DCI can indicate one or two TCI states for PDSCH DMRS. If two TCI states are indicated, the two TCI states correspond to different CDM groups of DMRS.

[0093] The new MAC CE in NR Rel.16 supports the activation of one or two TCI states for each codepoint in the TCI field of DCI.

[0094] In order to improve the performance of HST, multiple TRPs / RRHs (using different QCLs / beams) are being studied to simultaneously send multiple PDSCHs (same code word (CW)) / transport block (TB)) to one UE.

[0095] like Figure 2AAs shown, consider a mobile (UE) receiving beams (PDSCH) from two RRHs (TRPs). Figure 2B The PDSCH scenario 1 in the example is supported in NR Rel.16 using multi-PDSCH NCJT transmission based on single DCI and multiple DCI. In multi-PDSCH transmission based on multiple DCI, two DL data (CW / TB) can also be sent. In multi-PDSCH transmission based on single DCI, one or two DL data (CW / TB) can also be sent. PDSCHs from different TRPs can also be sent using different layers. For example, the PDSCH from TRP#1 can also be sent using layers 1 to layer x, and the PDSCH from TRP#2 can also be sent using layers x+1 to layer M (different layers from TRP#1).

[0096] Figure 2B The PDSCH scenario 2 in the example is not supported in NR Rel.16, but is valid for HST-SFN scenarios. To improve reliability, the same DL data (same data / CW / TB / PDSCH) can also be sent from multiple TRPs. PDSCHs from different TRPs can also be sent using the same layer. For example, both the PDSCH from TRP#1 and the PDSCH from TRP#2 can also be sent using layer 1 to layer x (the same layer).

[0097] However, the operation for supporting PDSCH case 2 is unclear. For example, the QCL assumption (DMRS assumption) in PDSCH case 2 is unclear. If such an operation is unclear, there is a concern that a decrease in throughput may be caused.

[0098] Therefore, the inventors of the present invention have conceived of operations in a case where the same downlink data is transmitted from a plurality of transmission points.

[0099] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The structures described in each embodiment may be applied individually or in combination.

[0100] In the present disclosure, panel, uplink (UL) transmission entity, transmission point, transmit receive point (TRP), RRH, antenna, beam, QCL assumption, TCI state, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (for example, demodulation reference signal (DeModulation Reference Signal (DMRS)) port), antenna port group of a certain signal (for example, DMRS port group), group for multiplexing (for example, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group), CORESET pool, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer) can also be replaced with each other. In addition, panel identifier (Identifier (ID)) and panel can also be replaced with each other. In the present disclosure, TRP ID and TRP can also be replaced with each other.

[0101] In the present disclosure, beam, TCI state, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D assumed by TCI state or QCL, RS of QCL type A assumed by TCI state or QCL may also be replaced with each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS may also be replaced with each other.

[0102] In the present disclosure, the TCI state may also be information related to the reception beam (spatial domain reception filter) indicated (set) for the UE (e.g., DL-RS, QCL type, cell to which the DL-RS is transmitted, etc.). The QCL assumption may also be information related to the reception beam (spatial domain reception filter) assumed by the UE based on the transmission or reception of the associated signal (e.g., PRACH) (e.g., DL-RS, QCL type, cell to which the DL-RS is transmitted, etc.).

[0103] In the present disclosure, a moving body may be any moving body as long as it moves at a specific speed or above, and may be, for example, a train, a car, a motorcycle, a ship, etc. In addition, communication between a UE included in the moving body and a transmission point (e.g., an RRH) may be performed directly between the UE and the transmission point, or between the UE and the transmission point via the moving body (e.g., an antenna provided on the moving body, etc.).

[0104] Furthermore, in the present disclosure, the UE included in the mobile body (HST) may also be simply referred to as UE.

[0105] In addition, in the present disclosure, "A / B" may be replaced by at least one of A and B, and "A / B / C" may be replaced by at least one of A, B, and C. In the present disclosure, cell, CC, carrier, BWP, activated DL BWP, activated UL BWP, and frequency band may be replaced by each other. In the present disclosure, RRC parameters, high-layer parameters, RRC information elements (IEs), and RRC messages may be replaced by each other. In the present disclosure, indexes, IDs, indicators, resource IDs, etc. may be replaced by each other.

[0106] In the present disclosure, support, control, be able to control, operate, and be able to operate may also be interchangeable.

[0107] In the present disclosure, activate, update, indicate, enable, and specify may be used interchangeably.

[0108] In the present disclosure, downlink (DL) data, CW, TB, and PDSCH may also be replaced with each other.

[0109] (Wireless Communication Method)

[0110] In each embodiment, a case where the same DL data is transmitted from two transmission points (TRP, RRH) is described, but the number of transmission points is not limited to two, and may be three or more.

[0111] In each embodiment, a plurality of PDSCHs may be transmitted from one or more transmission points (TRP, RRH) configured on a mobile path.

[0112] <First embodiment>

[0113] The UE may also support the setting / indication of a maximum of X QCL / TCI states (X is one or more, for example, X=2) for the same DMRS port (for each layer) for PDSCH reception in one UE.

[0114] A new PDSCH transmission mode using one or more TCI states for the same DMRS port of the PDSCH may also be defined. In the present disclosure, a new PDSCH transmission mode, one or more TCI states set / indicated for the same DMRS port of the PDSCH, and multiple TCI states set / indicated for the same DMRS port of the PDSCH may also be replaced with each other. The new PDSCH transmission mode may also be set / indicated by at least one of the following options 1 to 3.

[0115] [Option 1]

[0116] The new PDSCH transmission mode is set by RRC.

[0117] [Option 2]

[0118] The new PDSCH transmission mode is indicated by MAC CE. For example, the new PDSCH transmission mode may also be indicated together with the TCI state activation / deactivation for UE-specific PDSCH. The reserved ('R') bit (R=1) in the "Extended TCI state activation / deactivation MAC CE for UE-specific PDSCH" of Rel.16 is reused, and if two TCI states are activated for one TCI code point in DCI, this may also mean that the UE assumes two TCI states for all DMRS ports for PDSCH reception.

[0119] The MAC CE may also include a reserved bit R, a serving cell ID, a BWP ID, and an ID indicating a TCI status. i，2 The existence of C i 、TCI Status ID i，j . In TCI status i，2 In the presence of C i is set to 1, otherwise C i Set to 0. TCI Status ID i，j Indicates the TCI state ID identified by the higher layer parameter (TCI-StateId). i is the index of the code point of the TCI field of the DCI. TCI state ID i，j Indicates the jth TCI state represented by the i-th code point of the TCI field.

[0120] exist Figure 3 In the example of R=1, the TCI state corresponding to each code point of the TCI field in the DCI is applied to all DMRS ports of the PDSCH. In the case of R=0, for the operation of Rel.16, two TCI states corresponding to one code point of the TCI field in the DCI are indicated, and the two TCI states are applied to different CDM groups of the PDSCH DMRS.

[0121] [Option 3]

[0122] The new PDSCH transmission mode is indicated via DCI. The new PDSCH transmission mode can also be explicitly indicated by a new bit in the DCI. The new PDSCH transmission mode can also be implicitly indicated. For example, for this mode, the additional DAI field with the RRC setting of ACKNACKFeedbackMode=JointFeedback is reused. For this mode, the setting of ACKNACKFeedbackMode is not a problem. This mode affects the number of bits of the downlink assignment indicator (DAI).

[0123] Semi-static changes between the new PDSCH transmission mode, the multi-PDSCH transmission mode based on single DCI in Rel.16, and the multi-PDSCH transmission mode based on multiple DCI in Rel.16 can also be implemented through Option 1 and / or Option 2.

[0124] Option 3 can also be used to dynamically change between the new PDSCH transmission mode and the multiple PDSCH transmission mode based on a single DCI in Rel. 16.

[0125] X>2 is also possible.

[0126] According to the above first embodiment, one or more TCI states can be appropriately set / indicated for the same DMRS port.

[0127] <Second embodiment>

[0128] The antenna port indicator table for PDSCH DMRS (antenna port table, DMRS table) can also be used in the new PDSCH transmission mode.

[0129] The antenna port index table may also follow either of the following options 1 and 2.

[0130] [Option 1]

[0131] The antenna port index table for the new PDSCH transmission mode may also be defined / fixed in the specification.

[0132] The antenna port indicator table for the new PDSCH transmission mode may also comply with any of the following options 1-1 to 1-3.

[0133] [[Option 1-1]]

[0134] The antenna port indicator table used for the new PDSCH transmission mode may also be the antenna port indicator table of Rel.15 (Table 7.3.1.2.2-1 / 2 / 3 / 4).

[0135] <<Example of Option 1-1>>

[0136] In the case where the UE is configured / indicated with a new PDSCH transmission mode, the UE uses Table 7.3.1.2.2-1 / 2 / 3 / 4. In the case where this is not the case, when the UE receives an activation command (MAC CE) that maps at least one code point of the DCI field of TCI to two TCI states, the UE uses Table 7.3.1.2.2-1A / 2A / 3A / 4A.

[0137] [[Option 1-2]]

[0138] The antenna port indicator table used for the new PDSCH transmission mode may also be the antenna port indicator table of Rel.16 (Table 7.3.1.2.2-1A / 2A / 3A / 4A).

[0139] <<Example of Option 1-2>>

[0140] When the UE is configured / indicated with a new PDSCH transmission mode, or when the UE receives an activation command (MAC CE) that maps at least one code point of the DCI field of TCI to two TCI states, the UE uses Table 7.3.1.2.2-1A / 2A / 3A / 4A. Otherwise, the UE uses Table 7.3.1.2.2-1 / 2 / 3 / 4.

[0141] [[Option 1-3]]

[0142] In the case where all (each) code point of the DCI field of the TCI in the MAC CE is mapped to one TCI state, the UE may also use the antenna port index table of Rel. 15. In the case where at least one code point of the DCI field of the TCI in the MAC CE is mapped to two TCI states, the UE may also use the antenna port index table of Rel. 16.

[0143] <<Examples of options 1-3>>

[0144] In the case where the UE receives an activation command (MACCE) that maps at least one code point of the DCI field of TCI to two TCI states, the UE uses Table 7.3.1.2.2-1A / 2A / 3A / 4A. Otherwise, the UE uses Table 7.3.1.2.2-1 / 2 / 3 / 4.

[0145] [Option 2]

[0146] The antenna port indicator table for the new PDSCH transmission mode may also be configured for the UE.

[0147] The antenna port indicator table for the new PDSCH transmission mode may comply with any of the following options 2-1 and 2-2.

[0148] [[Option 2-1]]

[0149] Alternatively, either the antenna port indicator table of Rel. 15 or the antenna port indicator table of Rel. 16 may be set for the UE.

[0150] [[Option 2-2]]

[0151] When at least one code point of the DCI field of the TCI in the MAC CE is mapped to two TCI states, the UE may be configured with only one of the antenna port index table of Rel.15 and the antenna port index table of Rel.16. When all (each) code point of the DCI field of the TCI in the MAC CE is mapped to one TCI state, the UE may also use the antenna port index table of Rel.15. In this case, the UE may not be configured with the antenna port index table for the new PDSCH transmission mode.

[0152] According to the above second embodiment, the UE can use an appropriate antenna port indicator table for the new PDSCH transmission mode.

[0153] <Third Embodiment>

[0154] In the new PDSCH transmission mode, UE operation for PDSCH DMRS reception may also be defined.

[0155] When the UE is set / indicated a new PDSCH transmission mode (more than one TCI state for the same DMRS port of PDSCH), when two TCI states are indicated in one code point of the DCI field of TCI, the two TCI states may also correspond to all DMRS ports indicated by the antenna port indicator table.

[0156] In the case where the UE is set / indicated a new PDSCH transmission mode (more than one TCI state for the same DMRS port of PDSCH), one or two TCI states indicated in a code point of the DCI field of TCI may also correspond to all DMRS ports indicated by the antenna port indicator table.

[0157] According to the above third embodiment, the UE can appropriately receive the PDSCH DMRS.

[0158] <Fourth embodiment>

[0159] It may also be defined that the PDSCH uses the default QCL when the DCI does not include the TCI field or when the scheduling offset is less than a threshold (QCL duration, timeDurationForQCL).

[0160] When the existing single DCI-based framework is reused for scheduling of the new PDSCH transmission mode, the default QCL for PDSCH can also be the same as NR Rel.16.

[0161] The UE may also be configured / indicated a new PDCCH transmission mode for PDCCH QCL extension for HST-SFN. The new PDCCH transmission mode may also be configured / activated / indicated by a CORESET for one or more TCI states. One or more TCI states for the CORESET may also be configured / activated / indicated by at least one of the RRC and MAC CE. The multiple TCI states may also be two TCI states.

[0162] When a new PDCCH transmission mode is set / indicated and two TCI states are set / indicated for at least one CORESET, the UE may also follow at least one of the following processes 1 and 2.

[0163] [Process 1]

[0164] When the TCI presence information (tci-PresectInDCI) in the DCI is set to valid (enabled), when the offset (time offset) between the DL DCI (DCI scheduling PDSCH) and the PDSCH corresponding to the DL DCI is less than the threshold (timeDurationForQCL), and at least one set TCI state for the service cell of the scheduled PDSCH includes "QCL type D", the UE may also follow any of the following processes 1-1 and 1-2.

[0165] [[Process 1-1]] (Same as Rel.16)

[0166] In the case where at least one TCI code point indicates two TCI states, the UE may also assume that the DMRS port of the PDSCH of the serving cell is quasi co-located with the following RS, which is an RS related to the QCL parameters associated with the TCI state corresponding to the lowest code point among the TCI code points containing two different TCI states.

[0167] [[Process 1-2]] (New rules (e.g., Rel. 17))

[0168] In the case where at least one CORESET is indicated with two TCI states, the UE may also assume that the DMRS port of the PDSCH of the serving cell is quasi co-located with the following RS, which is an RS related to the QCL parameters associated with the TCI state corresponding to the lowest CORESET ID in the CORESET indicated with two different TCI states.

[0169] [Process 2]

[0170] In the case where the PDSCH is scheduled by a DCI format that does not include a TCI field, the UE may also follow any one of the following procedures 2-1 to 2-3.

[0171] [[Process 2-1]] (New rules (e.g., Rel. 17))

[0172] The UE may also assume that, regardless of the TCI state or QCL assumption applied for the CORESET used for PDCCH transmission, the TCI state (one or two TCI states) or QCL assumption for PDSCH is the same as the TCI state or QCL assumption applied for the CORESET used for PDCCH transmission. Here, the CORESET is indicated with one or two TCI states.

[0173] [[Process 2-2]] (New rules (e.g., Rel. 17))

[0174] The UE may also assume that the two TCI states or QCL transmissions for the PDSCH are the same as the two TCI states or QCL transmissions corresponding to the lowest CORESET ID in the CORESET that indicates two different TCI states.

[0175] [[Process 2-3]] (New rules (e.g., Rel.17))

[0176] When the offset (time offset) between the DL DCI and the PDSCH corresponding to the DL DCI is greater than the threshold (timeDurationForQCL), the UE may also consider process 2-1. When the offset (time offset) between the DL DCI and the PDSCH corresponding to the DL DCI is less than the threshold, the UE may also consider process 2-2.

[0177] The configuration / instruction for the new PDCCH transmission mode and the configuration / instruction for the new PDSCH transmission mode may be separate configuration / instructions or may be common configuration / instructions.

[0178] At least one of the following UE capabilities 1 and 2 may also be defined.

[0179] [UE Capability 1]

[0180] Whether the UE supports multiple (eg, two) TCI states for the same DMRS port (for each layer) for PDSCH.

[0181] [UE Capability 2]

[0182] The maximum number of TCI states for the same DMRS port (for each layer) for PDSCH. This maximum number may also be reported if the maximum number is greater than 2.

[0183] When a new PDSCH transmission mode is set / indicated, information related to beam migration may also be used. This may also mean that the order or pattern of QCL migration is set / indicated for the new PDSCH transmission mode.

[0184] The UE may also control the reception of DL transmissions sent from a TRP (transmission point) based on information related to beam migration. Beam migration may also be interchangeable with TCI state migration or QCL migration. Information related to beam migration may be notified to the UE from the network (e.g., base station, transmission point) using RRC signaling and at least one of MAC CEs, or may be predefined in the specification.

[0185] The information related to beam migration may also include at least one of information related to the migration of the TCI state, a period corresponding to each beam (also referred to as a beam period or a beam time), and a period corresponding to the RRH (also referred to as an RRH period or an RRH time). In addition, the period or time may be specified in units of at least one of a symbol, a time slot, a sub-time slot, a sub-frame, and a frame, or may be specified in units of ms or μm. The period or time may also be replaced by a distance or an angle.

[0186] Information related to the transition of TCI states (e.g., TCI#n→TCI#n+1) may also be the transition / order / index of the TCI states. The period corresponding to the beam may also be the duration / dwell-time of the beam. The period corresponding to the transmission point (RRH) may also be the duration / dwell-time of the RRH.

[0187] In each sequence or mode, one or two TCI states may be set to correspond to all DMRS ports for PDSCH reception.

[0188] According to the above-mentioned time scale analysis, it is possible to operate the beam indication based on the DCI for PDSCH, so the order or pattern of QCL migration may not be required for PDSCH.

[0189] According to the fourth embodiment described above, the UE can appropriately determine the parameters related to the QCL of the PDSCH.

[0190] <Fifth Embodiment>

[0191] When a new PDSCH transmission mode is set / indicated, resource allocation of the same DL data from multiple TRPs may also follow any of the following resource allocations 1 to 3.

[0192] [Resource Allocation 1]

[0193] The time / frequency resource allocations overlap completely. Figure 4A In the example of , in PDSCH1 and 2 scheduled by one DCI, the time and frequency resources completely overlap.

[0194] When QCL type D is set / indicated in at least one TCI state for PDSCH reception, full overlap can also be supported.

[0195] [Resource Allocation 2]

[0196] The time / frequency resource allocations partially overlap. Figure 4B In the example of FIG. 1 , in PDSCH 1 and PDSCH 2 scheduled by one DCI, time / frequency resources partially overlap.

[0197] When QCL type D is set / indicated in at least one TCI state for PDSCH reception, partial overlap can also be supported.

[0198] [Resource Allocation 3]

[0199] The time / frequency resource allocations do not overlap. Figure 4C In the example, in PDSCH1 and 2 scheduled by one DCI, time / frequency resources do not overlap.

[0200] In resource allocation 1 and 2, when the spatial separation is good enough for the beams from the two TRPs, the interference between the TRPs is small. Resource allocation 1 and 2 can also be supported when QCL type D is indicated in at least one TCI state for PDSCH reception.

[0201] In scheduling based on a single DCI, for resource allocations 2 and 3, the DCI can also be extended with indications of multiple resource assignments (RA, TDRA / FDRA) / rate matching (RM, rate matching indicator (RMI)) / QCL (TCI status) indicated by a single DCI. RA / RM / QCL for PDSCH from multiple TRPs can be indicated separately or jointly.

[0202] For the new PDSCH transmission mode, all of resource allocations 1 to 3 may be supported. At least one of resource allocations 1 to 3 may also be supported.

[0203] The UE is able to obtain synthetic gain for the same DL data from multiple TRPs.

[0204] PDSCH transmissions from multiple TRPs can also be scheduled through a single DCI following any of the following scheduling methods 1 to 4.

[0205] [Scheduling method 1]

[0206] The UE is set with higher-layer parameters for one TRP and applies a common value (value for one TRP) indicated through the DCI field to multiple TRPs.

[0207] [Scheduling method 2]

[0208] The UE is set with higher-layer parameters for multiple TRPs and applies a common value (a value for one TRP) indicated through a DCI field to the multiple TRPs.

[0209] [Scheduling method 3]

[0210] The UE is configured with high-level parameters for multiple TRPs, and applies the value indicated by the extended DCI field (the value of the number of scheduled TRPs, the value for each TRP) to each TRP.

[0211] exist Figure 5 In the example, the UE is configured with a list of multiple settings for TDRA / FDRA. Each setting in the list is associated with the field value (code point) of TDRA / FDRA in the DCI. The DCI contains a field for TDRA / FDRA for PDSCH0 from TRP#0 and a field for TDRA / FDRA for PDSCH1 from TRP#1. The field for TDRA / FDRA represents one of the settings in the list.

[0212] For example, when the DCI field of each TRP is 3 bits, the DCI field for two TRPs is 6 bits. As a result, the scheduling of each TRP becomes flexible. In order to determine the number of bits before blind detection of DCI, the number of scheduled TRPs can be set by high-level parameters or specified in the specification.

[0213] The DCI field size may also be a multiple of the DCI field size for a TRP. The DCI field size for each TRP may be the same as the existing DCI field size (eg, 3 bits) or smaller than the existing DCI field size (eg, 2 bits).

[0214] It is also possible that the DCI field size for a specific TRP is the existing DCI field size (e.g., 3 bits), while the DCI field size for other TRPs is smaller than the existing DCI field size (e.g., 2 bits).

[0215] [Scheduling method 4]

[0216] The UE is set with high-level parameters for one TRP, and derives values ​​for other TRPs based on the value for one TRP indicated through the DCI field. For example, the UE derives values ​​for other TRPs by adding an offset to the value for one TRP indicated through the DCI field.

[0217] The offset can be either the time offset for TDRA or the frequency offset for FDRA. Figure 6 In the example, the offset can also be at least one of a time offset from the time of PDSCH#0 (e.g., the start or end time slot / symbol / ) to the time of PDSCH#1 (e.g., the start or end), and a frequency offset from the frequency of PDSCH#0 (e.g., the lowest PRB) to the frequency of PDSCH#1 (e.g., the lowest or highest PRB / subcarrier).

[0218] The offset may be specified by the specification, set by higher layer parameters, or reported as a UE capability.

[0219] Multiple offsets may also be specified / set / reported. The UE may also use one of the multiple offsets (or switch one of the multiple offsets) based on at least one of the number of PDSCHs supported by the UE, the number of TRPs supported by the UE, the number of beams set, and the UE movement speed.

[0220] The DCI field in scheduling methods 1 to 4 may also be at least one of TCI state, TDRA, and FDRA.

[0221] Here, a comparison is made between the case where the PRBs of two PDSCHs from two TRPs overlap (resource allocation 1 and 2) and the case where they do not overlap (resource allocation 3).

[0222] When these PRBs completely overlap (resource allocation 1), the time / frequency resources of the two PDSCHs are the same, so in a single DCI, there is no need for extension of TDRA / FDRA and extension of the DCI field for time / frequency indication (the same as the single DCI used for enhanced Mobile Broad Band (eMBB) in Rel.16).

[0223] When these PRBs do not overlap (resource allocation 3), the time / frequency resources of the two PDSCHs are different, so in a single DCI, extension of TDRA / FDRA and extension of the DCI field for indicating time / frequency are required.

[0224] UEs supporting the new PDSCH transmission mode can also assume that the PRBs of the two PDSCHs from the two TRPs do not overlap.

[0225] The expected value of the received power when the PRBs of the two PDSCHs from the two TRPs do not overlap can be twice the expected value of the received power of a single TRP.

[0226] In the case of PRB overlap, the UE receives the complex received signal y=h1s1+h2s1=(h1+h2)s1. The UE can obtain h1 and h2 through channel estimation of each PDSCH. Here, each DMRS is orthogonal (for example, included in different CDM groups). The UE multiplies the received signal by (h1+h2) ＊ And we get y(h1+h2) ＊ =(h1+h2)(h1+h2) ＊ =|h1+h2| 2 s1.h ＊ is the complex conjugate of h. The expected value (ensemble average) of the received power is |s1| 2 .

[0227] In the case of non-overlapping PRBs, the UE receives complex received signals y1=h1s1 and y2=h2s1 on each PDSCH resource. The UE can obtain h1 and h2 through channel estimation of each PDSCH. Here, each DMRS is orthogonal (for example, included in different CDM groups). For the first PDSCH, the UE receives the received signal y1 by combining it with h1. ＊ Multiplying them gives y1h1=h1h1 ＊s1=|h1| 2 s1. For the second PDSCH, the UE combines the received signal y2 with h2 ＊ Multiplying them gives y2h2=h2h2 ＊ s1=|h2| 2 s1. The UE obtains |h1| by coherently combining the two received signals. 2 s1+|h2| 2 s1. The expected value (overall average) of the received power is 2|s1| 2 .

[0228] In the case of non-overlapping PRBs, there is a two-fold power gain relative to a single TRP. In the case of overlapping PRBs, there is no power gain relative to a single TRP. Thus, the primary use case is preferably the case of non-overlapping PRBs. This use case can also be a use case for HST, where resource efficiency is not so important.

[0229] In the case where the UE with multiple panels can use different panels in the reception of different simulated beams from different TRPs (in the case where the UE has multiple panels in frequency range (FR) 2 and the correlation of the paths between the multiple panels is small), the spatial isolation of the two beams is considered to be good enough. In this case, it is considered that the UE can distinguish the channels (h1 and h2) from the two beams even on the same time / frequency resources for decoding. In this case, (instead of only obtaining h=h1+h2), the UE can obtain h1s1 from panel 1 and h2s2 from panel 2. The same level of performance as the case where the PRBs do not overlap can be obtained.

[0230] Therefore, in the fifth embodiment, a restriction may be added when QCL type D is indicated in at least one TCI state for PDSCH reception. Regarding the case of PRB overlap, analog beamforming reception of different panels (QCL type D) can be used to obtain the same degree of gain as in the case of non-overlapping.

[0231] According to the above fifth embodiment, the UE can appropriately obtain information related to the scheduling of PDSCH from multiple TRPs.

[0232] (Wireless Communication System)

[0233] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0234] Figure 7 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0235] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0236] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0237] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0238] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0239] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0240] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0241] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0242] Multiple base stations 10 (e.g., RRH) can also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station can also be called an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) can also be called an IAB node.

[0243] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0244] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0245] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the 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.

[0246] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0247] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0248] In addition, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like can also be used in the wireless communication system 1.

[0249] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0250] The lower layer control information may also be transmitted via the 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 the PDSCH and the PUSCH.

[0251] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0252] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0253] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0254] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0255] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0256] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0257] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0258] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0259] (Base Station)

[0260] Figure 8 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0261] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0262] 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 that are described based on common knowledge in the technical field to which the present disclosure relates.

[0263] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0264] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0265] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0266] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0267] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0268] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0269] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0270] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0271] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0272] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0273] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0274] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0275] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0276] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0277] The transmitting and receiving unit 120 may also transmit information indicating multiple transmit configuration indication (TCI) states for the same demodulation reference signal (DMRS) port for receiving a physical downlink shared channel (PDSCH). The control unit 110 may also use the multiple TCI states to control the transmission of multiple PDSCHs carrying the same downlink data.

[0278] The transmitting and receiving unit 120 may also transmit information indicating multiple transmission configuration indication (TCI) states for the same demodulation reference signal (DMRS) port for a physical downlink shared channel (PDSCH). The control unit 110 may also control the transmission of at least one downlink control information indicating the TCI state and resource allocation of each of multiple PDSCHs carrying the same downlink data.

[0279] (User Terminal)

[0280] Fig. 9 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0281] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0282] 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 that are described based on common knowledge in the technical field to which the present disclosure relates.

[0283] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0284] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0285] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0286] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0287] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0288] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0289] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0290] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0291] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0292] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0293] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0294] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0295] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0296] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0297] The transmitting and receiving unit 220 may also receive information (e.g., setting / indication, RRC parameter / MAC CE / DCI) indicating multiple transmit setting indication (TCI) states for the same demodulation reference signal (DMRS) port for reception of a physical downlink shared channel (PDSCH). The control unit 210 may also use the multiple TCI states in the reception of multiple PDSCHs carrying the same downlink data (first embodiment).

[0298] The control unit 210 may also determine the DMRS port of the PDSCH based on an association between a value of an antenna port field in downlink control information and a DMRS port number (for example, an antenna port indicator table) (second embodiment).

[0299] One or two TCI states indicated in one code point of the TCI field in the downlink control information may also correspond to all DMRS ports indicated by the association (third embodiment).

[0300] The plurality of PDSCHs may be transmitted from one or more transmission points arranged on the moving path.

[0301] The transmitting and receiving unit 220 may also receive information (e.g., setting / indication, RRC parameter / MAC CE / DCI) indicating multiple transmission setting indication (TCI) states for the same demodulation reference signal (DMRS) port for a physical downlink shared channel (PDSCH). The control unit 210 may also determine at least one of the TCI states and resource allocations of multiple PDSCHs carrying the same downlink data based on the downlink control information (fourth embodiment, fifth embodiment).

[0302] When the downlink control information does not include a TCI field, or when the time offset between the downlink control information and the multiple PDSCHs is less than a threshold, the control unit 210 may also use a default value for the TCI state (fourth embodiment).

[0303] The transmitting and receiving unit 220 may also receive a PDSCH setting for one or more transmission points. The control unit 210 may also determine at least one of the TCI state and the resource allocation based on the setting and the downlink control information (fifth embodiment).

[0304] The plurality of PDSCHs may be transmitted from one or more transmission points arranged on the moving path.

[0305] (Hardware Structure)

[0306] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0307] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0308] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.101001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0309] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be used interchangeably. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or to exclude some of the devices.

[0310] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0311] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0312] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0313] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0314] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0315] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0316] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0317] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0318] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0319] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0320] (Variation Example)

[0321] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0322] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0323] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0324] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0325] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0326] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0327] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0328] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0329] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0330] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0331] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0332] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0333] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0334] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0335] In addition, one or more RBs may also be referred to as 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, an RB pair, etc.

[0336] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0337] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs may also be identified by the index of the RB relative to the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0338] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0339] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0340] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0341] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0342] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0343] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0344] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0345] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0346] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0347] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0348] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0349] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0350] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0351] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0352] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0353] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0354] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0355] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0356] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0357] There are also cases where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or some other appropriate terminology.

[0358] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0359] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0360] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0361] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0362] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0363] The various modes and implementation modes described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, 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)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems expanded based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0364] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0365] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0366] The term "determining" used in this disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0367] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0368] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0369] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0370] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be replaced by "access".

[0371] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0372] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0373] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0374] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0375] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit receives a first activation command indicating multiple transmission setting indication states (i.e., multiple TCI states) of the same demodulation reference signal DMRS port for receiving a physical downlink shared channel (i.e., PDSCH), and receives downlink control information (i.e., DCI) for scheduling the PDSCH; and a control unit, using the plurality of TCI states in receiving the PDSCH, When the time offset between the DCI and the PDSCH is greater than a threshold and the DCI does not include a TCI field, the control unit uses a TCI state or a QCL assumption applied to a control resource set, i.e., a CORESET, in receiving the PDSCH, wherein the CORESET is a CORESET used in a downlink control channel PDCCH for transmitting the DCI, When the PDSCH transmission mode using the multiple TCI states of the same DMRS port for reception of the PDSCH is set by high-layer signaling and the first activation command is received, the control unit uses the multiple TCI states in reception of the PDSCH, The setting of the PDSCH transmission mode of the multiple TCI states using the same DMRS port for receiving the PDSCH and the downlink control channel transmission mode of the PDCCH transmission mode in which multiple TCI states are activated for one control resource set, i.e., CORESET, are set separately.

2. The terminal according to claim 1, wherein: The first activation command maps at least one code point of the TCI field of the DCI to two TCI states, The control unit uses a first antenna port table when receiving the first activation command, and uses a second antenna port table different from the first antenna port table when receiving a second activation command that maps each code point of the TCI field of the DCI to a TCI state.

3. The terminal according to claim 1, wherein: The control unit reports capability information, The capability information indicates that the terminal supports the multiple TCI states of the same DMRS port for receiving the PDSCH.

4. The terminal according to claim 1, wherein: The first activation command maps at least one code point of the TCI field of the DCI to two TCI states, When the time offset between the DCI and the PDSCH is less than a threshold, the control unit uses the TCI state corresponding to the lowest code point among the code points to which the two TCI states are mapped in the first activation command in receiving the PDSCH.

5. A wireless communication method of a terminal, comprising: The step of receiving a first activation command indicating multiple transmission configuration indication states, i.e., multiple TCI states, of the same demodulation reference signal DMRS port for receiving a physical downlink shared channel, i.e., PDSCH; The step of receiving downlink control information (DCI) for scheduling the PDSCH; as well as Using step, using the multiple TCI states in receiving the PDSCH, When the time offset between the DCI and the PDSCH is greater than a threshold and the DCI does not include a TCI field, in the using step, a TCI state or a QCL assumption applied for a control resource set (CORESET) is used in reception of the PDSCH, the CORESET being a CORESET used in a downlink control channel PDCCH for transmitting the DCI, When the PDSCH transmission mode using the multiple TCI states of the same DMRS port for reception of the PDSCH is set by high-layer signaling and the first activation command is received, in the using step, the multiple TCI states are used in reception of the PDSCH, The setting of the PDSCH transmission mode of the multiple TCI states using the same DMRS port for receiving the PDSCH and the downlink control channel transmission mode of the PDCCH transmission mode in which multiple TCI states are activated for one control resource set, i.e., CORESET, are set separately.

6. A base station, comprising: A transmitting unit, transmitting a first activation command indicating multiple transmission setting indication states, i.e., multiple TCI states, of the same demodulation reference signal DMRS port for receiving a physical downlink shared channel, i.e., PDSCH, and transmitting downlink control information, i.e., DCI, for scheduling the PDSCH; and a control unit, using the multiple TCI states to control the transmission of the PDSCH, When the time offset between the DCI and the PDSCH is greater than a threshold and the DCI does not include a TCI field, the control unit controls the transmission of the PDSCH using a TCI state or a QCL assumption applied for a control resource set, i.e., a CORESET, which is a CORESET used in a downlink control channel PDCCH for transmitting the DCI, When a PDSCH transmission mode using the multiple TCI states of the same DMRS port for receiving the PDSCH is set by high-level signaling and the first activation command is sent, the control unit uses the multiple TCI states to control the transmission of the PDSCH, The control unit separately sets the PDSCH transmission mode for the multiple TCI states using the same DMRS port for receiving the PDSCH and the downlink control channel transmission mode, i.e., the PDCCH transmission mode, in which multiple TCI states are activated for one control resource set, i.e., CORESET.

7. A system having a terminal and a base station, The terminal has: A receiving unit receives a first activation command indicating multiple transmission setting indication states (i.e., multiple TCI states) of the same demodulation reference signal DMRS port for receiving a physical downlink shared channel (i.e., PDSCH), and receives downlink control information (i.e., DCI) for scheduling the PDSCH; and a control unit, using the plurality of TCI states in receiving the PDSCH, The base station has: A sending unit, sending the first activation command, When the time offset between the DCI and the PDSCH is greater than a threshold and the DCI does not include a TCI field, the control unit of the terminal uses a TCI state or a QCL assumption applied to a control resource set, i.e., a CORESET, in receiving the PDSCH, wherein the CORESET is a CORESET used in a downlink control channel PDCCH for transmitting the DCI, When the PDSCH transmission mode using the multiple TCI states of the same DMRS port for reception of the PDSCH is set by high-layer signaling and the first activation command is received, the control unit of the terminal uses the multiple TCI states in reception of the PDSCH, The setting of the PDSCH transmission mode of the multiple TCI states using the same DMRS port for receiving the PDSCH and the downlink control channel transmission mode of the PDCCH transmission mode in which multiple TCI states are activated for one control resource set, i.e., CORESET, are set separately.

Images