Terminal, wireless communication method, base station and system

Abstract

The present invention enables a non-serving cell to be suitably sent / received. A terminal according to one embodiment of the present disclosure includes: a transmission unit that transmits information related to a plurality of Cell Radio Network Temporary identifiers (C-RNTI); and a control unit that controls transmission / reception which uses the plurality of C-RNTI.

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [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 [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), layer 1 / layer 2 (L1 / L2) inter-cell mobility is being considered to facilitate more efficient (lower latency and overhead) DL / UL beam management.

[0006] L1 / L2 inter-cell mobility allows the serving cell to be changed using functions such as beam control without reconfiguring Radio Resource Control (RRC). In other words, it is possible to send and receive data to and from a non-serving cell without handover. Since handover requires RRC reconnection and creates periods when data communication is unavailable, L1 / L2 inter-cell mobility, which does not require handover, is preferable.

[0007] However, there is a possibility that the Cell Radio Network Temporary Identifier (C-RNTI) used in the serving cell cannot be used as is for transmission and reception with non-serving cells. For example, the C-RNTI used in the serving cell may already be in use for another user terminal (User Equipment (UE)) in the non-serving cell. If the same C-RNTI is used between UEs in the same cell, problems may occur, such as the erroneous reading of downlink control information addressed to another UE.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method that can appropriately perform transmission and reception of a non-serving cell. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes: for layer 1 / layer 2 (L1 / L2) inter-cell mobilityMultiple Cell Radio Network Temporary Identifiers (C-RNTIs) A receiver that receives radio resource control (RRC) signaling to set candidates for and the plurality of C-RNTIs At least one of and a control unit that controls transmission and reception using the above. [Effects of the Invention]

[0010] According to one aspect of the present disclosure, transmission and reception of non-serving cells can be performed appropriately. [Brief explanation of the drawings]

[0011] [Figure 1] 1A-1D are diagrams illustrating an example of a multi-TRP scenario. [Figure 2] 2A and 2B are diagrams showing an example of an intra-cell TRP and an example of an inter-TRP, respectively. [Figure 3] 3A and 3B are diagrams illustrating an example of RRC configuration of association between a QCL source RS and a non-serving cell RS. [Figure 4] FIG. 4 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 5] FIG. 5 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (TCI, spatial relations, QCL) In NR, it is being considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a user terminal (user equipment (UE)) of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0013] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state which is applied to an uplink signal / channel may be expressed as a spatial relation.

[0014] The TCI state is information about the quasi-co-location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or signal.

[0015] A QCL is an index that indicates the statistical properties of a signal / channel. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same between these different signals / channels (i.e., they are QCLs with respect to at least one of these).

[0016] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be determined based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with an sQCL (spatial QCL).

[0017] A plurality of types (QCL types) of QCLs may be defined. For example, four QCL types A and B may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may also be referred to as QCL parameters) are listed below: QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL Type B (QCL-B): Doppler shift and Doppler spread, QCL Type C (QCL-C): Doppler shift and mean delay, · QCL Type D (QCL-D): Spatial reception parameters.

[0018] The assumption by a UE that a given Control Resource Set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0019] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumption of the signal / channel.

[0020] The TCI state may be, for example, information about the QCL between the target channel (in other words, the Reference Signal (RS) for the channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0021] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0022] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0023] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0024] 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)).

[0025] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a CSI-RS for tracking (also called a Tracking Reference Signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0026] An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS / PBCH block.

[0027] A TCI state information element ("TCI-state IE" in RRC) configured by higher layer signaling may include one or more pieces of QCL information ("QCL-Info"). The QCL information may include at least one of information about an RS having a QCL relationship (RS relationship information) and information indicating a QCL type (QCL type information). The RS relationship information may include information such as an index of the RS (e.g., an SSB index, a Non-Zero-Power (NZP) CSI-RS resource identifier), an index of a cell in which the RS is located, and an index of a Bandwidth Part (BWP) in which the RS is located.

[0028] In Rel. 15 NR, both QCL type A RS and QCL type D RS, or only QCL type A RS, can be configured for a UE as the TCI state of at least one of the PDCCH and PDSCH.

[0029] When a TRS is configured as an RS for QCL Type A, unlike a demodulation reference signal (DMRS) for a PDCCH or a PDSCH, the same TRS is expected to be transmitted periodically over a long period of time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0030] A UE that has the TRS configured as a QCL Type A RS in the TCI state of a PDCCH or PDSCH DMRS can assume that the QCL Type A parameters (average delay, delay spread, etc.) of the PDCCH or PDSCH DMRS and the TRS are the same, and can therefore determine the Type A parameters (average delay, delay spread, etc.) of the PDCCH or PDSCH DMRS from the measurement result of the TRS. When performing channel estimation for at least one of the PDCCH and the PDSCH, the UE can perform more accurate channel estimation using the measurement result of the TRS.

[0031] A UE configured with a QCL type D RS can determine a UE receive beam (spatial domain receive filter, UE spatial domain receive filter) using the QCL type D RS.

[0032] An RS of QCL type X in a TCI state may refer to an RS that has a relationship of QCL type X with (the DMRS of) a certain channel / signal, and this RS may be called a QCL source of QCL type X in the TCI state.

[0033] (Multi-TRP) In NR, one or more Transmission / Reception Points (TRPs) (multi-TRP) are considered to perform DL transmission to a UE using one or more panels (multi-panel), and a UE is considered to perform UL transmission to one or more TRPs.

[0034] Note that multiple TRPs may correspond to the same cell identifier (ID), or different cell IDs, which may be physical cell IDs (PCIDs, PCIs) or virtual cell IDs.

[0035] 1A-1D illustrate an example of a multi-TRP scenario, assuming, but not limited to, that each TRP is capable of transmitting four different beams.

[0036] 1A shows an example of a case where only one TRP (TRP1 in this example) of multiple TRPs transmits to the UE (this may be referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both control signals (PDCCH) and data signals (PDSCH) to the UE.

[0037] 1B shows an example of a case where only one TRP (TRP1 in this example) transmits a control signal to a UE, and the TRP transmits a data signal (this case may be called a single master mode). The UE receives each PDSCH transmitted from the TRP based on one Downlink Control Information (DCI).

[0038] Figure 1C shows an example of a case where each of the multiple TRPs transmits a part of the control signal to the UE, and the multiple TRPs transmit data signals (this may be called a master-slave mode). TRP1 may transmit part 1 of the control signal (DCI), and TRP2 may transmit part 2 of the control signal (DCI). Part 2 of the control signal may depend on part 1. The UE receives each PDSCH transmitted from the multiple TRPs based on these parts of DCI.

[0039] 1D shows an example of a case where each of the multiple TRPs transmits a separate control signal to the UE, and the multiple TRPs transmit data signals (this may be referred to as a multi-master mode). A first control signal (DCI) may be transmitted from TRP1, and a second control signal (DCI) may be transmitted from TRP2. The UE receives each PDSCH transmitted from the multiple TRPs based on these DCIs.

[0040] When multiple PDSCHs (which may be referred to as multiple PDSCHs) from multiple TRPs as shown in Figure 1B are scheduled using one DCI, the DCI may be referred to as a single DCI (single PDCCH). Also, when multiple PDSCHs from multiple TRPs as shown in Figure 1D are scheduled using multiple DCIs, these multiple DCIs may be referred to as multiple DCIs (multiple PDCCHs).

[0041] Each TRP of a multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) is being considered as one form of multi-TRP transmission.

[0042] In the NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP2 performs modulation mapping and layer mapping on a second codeword to transmit a second number of layers (e.g., two layers) with a second precoding.

[0043] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in at least one of the time and frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0044] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (Quasi-Co-Location (QCL)). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a predetermined QCL type (e.g., QCL type D).

[0045] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. Repetition schemes (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0046] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0047] In the multi-master mode as shown in FIG. 1D, two configurations are possible: one in which the same physical cell ID is configured for multiple TRPs (intra-TRP mobility, intra-cell TRP mobility, intra-cell mobility, or intra-cell multi-TRP operation), and one in which different physical cell IDs are configured for multiple TRPs (inter-TRP mobility, inter-cell TRP mobility, inter-cell mobility, or inter-cell multi-TRP operation).

[0048] Figure 2A shows an example of intra-cell mobility. As shown in Figure 2A, the same physical cell ID (PCI1) is set for TRP1 and TRP2. In this case, the SSB (SSB index) transmitted by TRP1 and the SSB transmitted by TRP2 must be different. In the example of Figure 2A, the SSBs of TRP1 are 0-31, and the SSBs of TRP2 are 32-63.

[0049] FIG. 2B is a diagram showing an example of inter-cell mobility. As shown in FIG. 2B, different physical cell IDs (PCI1, PCI2) are configured for TRP1 and TRP2. In this case, the SSB transmitted by TRP1 and the SSB transmitted by TRP2 may overlap or may be different. In the example of FIG. 2B, the SSBs of TRP1 and TRP2 may both be 0-63. Alternatively, the SSBs of TRP1 may be 0-31, and the SSBs of TRP2 may be 32-63. In this case, the RS in the TCI state of PDSCH1 / PDSCH2 is PCI1 or PCI2.

[0050] Note that intra-cell mobility and inter-cell mobility are not limited to a multi-TRP configuration.

[0051] Layer 1 / Layer 2 (L1 / L2) inter-cell mobility is being considered to facilitate more efficient (lower latency and overhead) DL / UL beam management. For example, QCL / TCI-related enhancements may be implemented to enable inter-cell multi-TRP operation, assuming multi-DCI-based multi-PDSCH reception.

[0052] L1 / L2 inter-cell mobility allows the serving cell to be changed using functions such as beam control without RRC reconfiguration. In other words, it is possible to send and receive data to and from a non-serving cell without handover. Since handover requires RRC reconnection, which creates a period when data communication is unavailable, L1 / L2 inter-cell mobility, which does not require handover, is preferable.

[0053] However, there is a possibility that the C-RNTI used in the serving cell cannot be used as is for transmission and reception with a non-serving cell. For example, the C-RNTI used in the serving cell may already be in use for another UE in a non-serving cell. If the same C-RNTI is used between UEs in the same cell, problems may occur, such as erroneously reading DCI addressed to another UE (e.g., the Cyclic Redundancy Check (CRC) of the DCI addressed to another UE may be accidentally descrambled).

[0054] Therefore, the present inventors have devised a method for appropriately performing transmission and reception of non-serving cells. According to one aspect of the present disclosure, for example, high-speed inter-cell mobility can be realized.

[0055] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0056] In the present disclosure, "A / B" may be read as "at least one of A and B."

[0057] In the present disclosure, the terms panel, uplink (UL) transmitting entity, point, TRP, TRP-ID, TRP ID, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, predetermined antenna port (e.g., demodulation reference signal (DMRS) port), predetermined antenna port group (e.g., DMRS port group), predetermined group (e.g., code division multiplexing (CDM) group, predetermined reference signal group, CORESET group), and CORESET pool may be interchangeable. Also, panel identifier (ID) and panel may be interchangeable.

[0058] In the present disclosure, cell, CC, carrier, BWP, and band may be read interchangeably.

[0059] In the present disclosure, the terms index, ID, indicator, and resource ID may be read interchangeably.

[0060] The terms TCI state, TCI state or QCL assumption, QCL assumption, QCL information, QCL parameters, spatial-domain receive filter, UE spatial-domain receive filter, spatial-domain filter, UE receive beam, DL receive beam, DL precoding, DL precoder, DL-RS, QCL type D RS in TCI state or QCL assumption, and QCL type A RS in TCI state or QCL assumption may be interchangeable. The terms QCL type D RS, DL-RS associated with QCL type D, DL-RS with QCL type D, source of DL-RS, SSB, and CSI-RS may be interchangeable.

[0061] In the present disclosure, the TCI state may be information about a receive beam (spatial domain receive filter) instructed (configured) for the UE (e.g., DL-RS, QCL type, cell in which the DL-RS is transmitted, etc.). The QCL assumption may be information about a receive beam (spatial domain receive filter) assumed by the UE based on transmission or reception of an associated signal (e.g., PRACH), (e.g., DL-RS, QCL type, cell in which the DL-RS is transmitted, etc.).

[0062] In the present disclosure, spatial relationship, spatial relationship information, spatial relationship assumption, QCL parameter, spatial domain transmit filter, UE spatial domain transmit filter, spatial domain filter, UE transmit beam, UL transmit beam, UL precoding, UL precoder, spatially related RS, DL-RS, QCL assumption, SRI, spatial relationship based on SRI, and UL TCI may be interpreted as interchangeable.

[0063] In the present disclosure, the terms TRS, CSI-RS for tracking, CSI-RS having TRS information (higher layer parameter trs-Info), and NZP-CSI-RS resource in an NZP-CSI-RS resource set having TRS information may be read interchangeably.

[0064] In this disclosure, the terms beam, spatial-domain filter, spatial setting, TCI state, TCI state pool, multiple TCI states, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, QCL assumption, QCL parameter, spatial-domain receive filter, UE spatial-domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS for QCL type D in TCI state / QCL assumption, RS for QCL type A in TCI state / QCL assumption, spatial relationship, spatial-domain transmit filter, UE spatial-domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be interchangeable. In this disclosure, the terms QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be interchangeable.

[0065] In this disclosure, the terms "normal TRP," "single TRP," "single TRP system," "single TRP transmission," and "single PDSCH" may be interchangeable. In this disclosure, the terms "multiple TRP," "multiple TRP system," "multiple TRP transmission," and "multiple PDSCH" may be interchangeable. In this disclosure, the terms "single DCI," "single PDCCH," "multiple TRP based on a single DCI," and "activating two TCI states on at least one TCI codepoint" may be interchangeable.

[0066] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, no multi-TRP enabled by RRC / DCI, no multiple TCI states / spatial relationships enabled by RRC / DCI, no CORESETPoolIndex value of 1 set for any CORESET and no code point in the TCI field mapped to two TCI states, communicating with one transmitting / receiving point, and applying a single TRP may be read interchangeably.

[0067] In the present disclosure, "multi-TRP," "channel using multi-TRP," "channel using multiple TCI states / spatial relationships," "multi-TRP being enabled by RRC / DCI," "multiple TCI states / spatial relationships being enabled by RRC / DCI," and "at least one of multi-TRP based on a single DCI" and "multi-TRP based on multiple DCI" may be interchangeable. In the present disclosure, "multi-TRP based on multiple DCI," and "setting a CORESET pool index (CORESETPoolIndex) value of 1 for the CORESET" may be interchangeable. In the present disclosure, "multi-TRP based on a single DCI," and "at least one code point in the TCI field is mapped to two TCI states" may be interchangeable.

[0068] (Wireless communication method) In one embodiment of the present disclosure, a UE performs UL / DL transmission and reception using multiple C-RNTIs.

[0069] In the present disclosure, "UL / DL transmission / reception" and "transmission / reception with a cell" may be interpreted interchangeably as transmission of any UL channel / signal (e.g., RS), reception of any DL channel / signal (e.g., RS), transmission of any UL channel / signal (e.g., RS) to a cell, reception of any DL channel / signal (e.g., RS) in a cell, etc.

[0070] Furthermore, in the present disclosure, terms such as "using C-RNTI" and "performing UL / DL transmission and reception using C-RNTI" may be interchangeably read as "performing PDCCH detection (blind detection) using C-RNTI," "performing PDSCH decoding using C-RNTI," "performing PUCCH / PUSCH scrambling using C-RNTI," etc. This is because C-RNTI is used for scrambling the CRC of the PDCCH (DCI), scrambling data (information bits) of the PDSCH / PUCCH / PUSCH, etc.

[0071] In the first embodiment, a UE holds a C-RNTI of a non-serving cell (e.g., a second C-RNTI) in addition to a C-RNTI of a serving cell (e.g., a first C-RNTI). The UE uses the former to control transmission and reception with the serving cell and the latter to control transmission and reception with the non-serving cell.

[0072] The number of non-serving cells that a UE expects to use (how many non-serving cells it controls transmission and reception to and from; in other words, the number of non-serving cells that the UE can transmit and receive from) may be determined in advance by a specification, may be configured in the UE by higher layer signaling (e.g., RRC / MAC CE), or may be determined based on the UE capabilities.

[0073] The UE may retain / assume the C-RNTIs of the number of non-serving cells that have been specified / configured / assumed / determined in addition to the C-RNTI of the serving cell.

[0074] The UE may use the C-RNTI of the non-serving cell for transmission and reception with the non-serving cell (for example, transmission and reception of at least the physical layer (detection of the PDCCH, descrambling of data on the PDSCH, etc.)).

[0075] In addition, in the present disclosure, "C-RNTI of a non-serving cell," "C-RNTI for a non-serving cell," "additional C-RNTI for a non-serving cell," "additional C-RNTI," etc. may be read interchangeably.

[0076] <Method of configuring / notifying multiple C-RNTIs (method of adding an additional C-RNTI for a non-serving cell)> The UE may report the C-RNTI for the non-serving cell to the network (e.g., base station) using the MAC CE, which may be different from the C-RNTI MAC CE already specified in Rel.15 / 16.

[0077] Note that the C-RNTI MAC CE is a MAC CE transmitted from the UE in message 3 in a Contention Based Random Access (CBRA) procedure. The C-RNTI (also referred to as TC-RNTI (Temporary C-RNTI) at this point) notified from the UE to the base station using the C-RNTI MAC CE officially becomes the C-RNTI for the UE after contention resolution.

[0078] This MAC CE may include a C-RNTI field of a certain number (e.g., 16) of bits indicating the C-RNTI (e.g., the C-RNTI of the MAC entity) similar to the C-RNTI MAC CE. This MAC CE may also include a Cell ID field indicating the cell ID (e.g., PCID (Physical Cell ID)) of the target non-serving cell.

[0079] Also, this MAC CE may be associated with the same Logical Channel ID (LCID) as the existing C-RNTI MAC CE, or may be associated with a different LCID.

[0080] Note that the UE may be configured in advance with candidates for the C-RNTI of non-serving cells by RRC signaling. The C-RNTI field may indicate one or more C-RNTIs from among the candidates (for example, it may indicate an index value indicating the ordinal number of the entry among the candidates).

[0081] In this way, by notifying the additional C-RNTI by the MAC CE, the UE can notify the C-RNTI of a non-serving cell (a surrounding cell, a neighbor cell) without RRC reconfiguration.

[0082] As another method for reporting the additional C-RNTI, the UE determines the additional C-RNTI and transmits information about the determined additional C-RNTI to the network. This transmission may be performed using at least one of the PUSCH, message 3 PUSCH, PUCCH, etc. The information about the additional C-RNTI may be transmitted using at least one of the MAC CE, UCI, etc. At this point, the additional C-RNTI may be referred to as an additional TC-RNTI.

[0083] The UE may determine the additional C-RNTI randomly or may determine the additional C-RNTI based on at least one of the C-RNTI of the serving cell and the cell ID of a non-serving cell.

[0084] Information about the additional C-RNTI may be transmitted using a MAC CE that is an extension / modification of an existing C-RNTI MAC CE (for example, may be referred to as an enhanced C-RNTI MAC CE). The extended C-RNTI MAC CE may include a field for the additional C-RNTI in addition to a field for the C-RNTI of the serving cell.

[0085] The UE may determine the additional TC-RNTI as the additional C-RNTI upon receiving a response from the base station, which may be a response to a transmission including information of the additional C-RNTI (e.g., message 4, DCI, HARQ-ACK, PDSCH, etc.).

[0086] <Meaning of sending and receiving with non-serving cells> "Transmitting / receiving non-serving cells" may mean that the QCL assumptions / TCI states for transmitting / receiving channels / signals are associated with the RS (e.g., SSB / CSI-RS) of the non-serving cells.

[0087] For example, the PDSCH of a non-serving cell may be scheduled on PDSCH resources configured by the PDSCH configuration ("PDSCH-config") set in the RRC parameters for a serving cell (e.g., "ServingCellConfig" indicating the configuration of the serving cell), in the same manner as in the Rel. 15 / 16 NR specifications, but may mean that the QCL source for this PDSCH is associated (configured) with the non-serving cell.

[0088] The UE may assume that the QCL source RS in the TCI state / QCL assumption being used transmits and receives using an additional C-RNTI for the non-serving cell for channels / RS (e.g., PDCCH, PDSCH, CSI-RS, TRS, PUCCH, PUSCH, SRS) associated with the non-serving cell.

[0089] In Rel.15 / 16, the TCI state of the PDSCH was not always explicitly specified. For example, if the RRC parameter "tciPresentInDCI" indicating that the DCI contains a TCI field is not configured, the UE can derive the TCI state of the PDSCH from the TCI state of the PDCCH.

[0090] Similarly in this embodiment, if the TCI state of the PDSCH is not explicitly specified, the UE may assume that it derives the QCL information from the TCI state of the PDCCH, and the UE may transmit and receive the PDSCH using an additional C-RNTI for the non-serving cell if the TCI state of the PDCCH is associated with the non-serving cell RS.

[0091] In addition, if the QCL source RS of the TCI state of the DCI (PDCCH) that schedules the PDSCH / PUSCH is associated with a non-serving cell RS, the UE may transmit and receive the PDSCH / PUSCH using an additional C-RNTI for the non-serving cell.

[0092] Note that in Release 17, a framework for the unified TCI (common TCI) state is planned to be introduced. When the QCL source RS of the unified TCI state indicated by MAC CE / DCI is related to the non-serving cell RS, the UE may perform transmission and reception of channels / RSs (e.g., PDCCH, PDSCH, CSI-RS, TRS, PUCCH, PUSCH, SRS) using an additional C-RNTI for the non-serving cell.

[0093] <Association between QCL source RS and non-serving cell RS> The association between the QCL source RS and the non-serving cell RS may be set for the UE by upper layer signaling. For example, the UE may explicitly set at least one of information on whether it corresponds to the non-serving cell (RS) and the PCI for the TCI state (or the QCL source RS of the TCI state) by RRC signaling, and the PCI may correspond to the PCI of the non-serving cell. This information on whether it corresponds to the non-serving cell may be called a non-serving cell flag, a serving cell flag, a cell flag, etc.

[0094] Figures 3A and 3B are diagrams showing an example of RRC configuration of the association between the QCL source RS and the non-serving cell RS.

[0095] Figure 3A shows an example in which for TCI state #1, TRS #1 is set as the QCL type A and D source RS, and the value of the PCI corresponding to this TCI state (or TRS #1) is set to "358". Note that the PCI may be represented by a certain number of bits (e.g., 10 bits).

[0096] In the example of Figure 3A, TCI state #1 may mean having TRS #1 of the (non)-serving cell with PCI = 358 for QCL type A / D.

[0097] FIG. 3B shows an example in which TRS#1 is set as the source RS for QCL types A and D for TCI state #1, and this TCI state (or TRS#1) has its non-serving cell flag set to "01."

[0098] The non-serving cell flag may be expressed by, for example, two bits. A non-serving cell flag = "00" may indicate the serving cell, a non-serving cell flag = "01" may indicate non-serving cell #1, a non-serving cell flag = "10" may indicate non-serving cell #2, and a non-serving cell flag = "11" may indicate non-serving cell #3.

[0099] When the number of non-serving cells that can be used is small, notifying a non-serving cell flag as in Figure 3B can reduce the number of bits required to notify non-serving cells compared to notifying a PCI as in Figure 3A.

[0100] The cell IDs (PCIs) of the serving cell / non-serving cell corresponding to the non-serving cell flag may be separately notified to the UE by RRC / MAC CE or the like.

[0101] The number of bits of the non-serving cell flag may be predefined by the specifications (e.g., 1 bit), may be set by a higher layer, or may be determined based on the number of cell IDs (PCIs) of the above-mentioned set serving cell / non-serving cells.

[0102] The number of additional C-RNTIs for non-serving cells may be determined based on at least one of the number of bits of the non-serving cell flag, the cell IDs (PCIs) of the serving cell / non-serving cells, etc. For example, if the non-serving cell flag is one bit, it may be determined that there is one additional C-RNTI for the non-serving cell, and if the non-serving cell flag is two bits, it may be determined that there are three additional C-RNTIs for the non-serving cell.

[0103] According to the above-described embodiment, for example, transmission and reception of non-serving cells can be appropriately performed based on the additional C-RNTI. Furthermore, the RS of the non-serving cell can be applied as a QCL source. For example, even when the serving cell is changed due to inter-cell mobility, the RS of the non-serving cell can be applied as is to determine the TCI state, eliminating the need for RRC reconfiguration and reducing communication overhead.

[0104] <Other> It should be noted that at least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0105] The specific UE capabilities may indicate at least one of the following: Whether multiple C-RNTIs (additional C-RNTIs) are supported, Whether or not transmission and reception with non-serving cells is supported; Whether to support QCL assumption / TCI state of non-serving cell RS, · Whether or not to support setting / using PCI of non-serving cells.

[0106] Furthermore, at least one of the above-described embodiments may be applied when specific information related to the above-described embodiments is configured in the UE by higher layer signaling (if not configured, for example, the operation of Rel. 15 / 16 applies). For example, the specific information may be information for configuring the QCL assumption / TCI state of a non-serving cell RS, any RRC parameter for a specific release (e.g., Rel. 17), etc.

[0107] Note that "C-RNTI" in the present disclosure may be replaced with any identifier (for example, another RNTI).

[0108] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0109] 4 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0110] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0111] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0112] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0113] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0114] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0115] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0116] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0117] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0118] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0119] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0120] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, 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), or the like may be used in at least one of the downlink (DL) and the uplink (UL).

[0121] The radio access scheme may also be called a waveform. Note that 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 UL and DL radio access schemes.

[0122] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0123] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0124] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0125] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0126] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0127] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0128] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0129] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0130] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0131] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0132] 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 the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0133] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0134] (base station) 5 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0135] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0136] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0137] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0138] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0139] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0140] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0141] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0142] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0143] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0144] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0145] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0146] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0147] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0148] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0149] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0150] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0151] The transmitting / receiving unit 120 may receive information related to a plurality of Cell Radio Network Temporary Identifiers (C-RNTIs). The control unit 110 may control transmission and reception using at least one of the plurality of C-RNTIs.

[0152] (user terminal) 6 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0153] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0154] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0155] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0156] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0157] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0158] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0159] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0160] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0161] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0162] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0163] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0164] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0165] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0166] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0167] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0168] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0169] The transmitting / receiving unit 220 may transmit information related to a plurality of Cell Radio Network Temporary Identifiers (C-RNTIs). The control unit 210 may control transmission and reception using (each of) the plurality of C-RNTIs.

[0170] The transmitter 220 may transmit information related to the C-RNTI for the non-serving cell using a Medium Access Control Element (MAC CE).

[0171] The control unit 210 may set information indicating whether the cell corresponds to a non-serving cell in relation to a transmission configuration indication state (TCI state).

[0172] The control unit 210 may configure a physical cell identifier (PCI) corresponding to a non-serving cell in association with a transmission configuration indication state (TCI state).

[0173] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0174] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0175] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 7 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0176] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0177] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0178] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0179] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0180] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0181] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0182] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0183] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0184] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0185] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0186] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0187] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0188] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0189] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0190] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0191] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0192] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0193] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot 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 (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0194] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0195] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0196] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0197] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0198] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0199] 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 in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0200] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0201] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0202] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0203] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0204] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0205] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0206] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0207] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0208] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0209] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0210] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0211] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0212] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0213] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0214] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0215] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0216] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0217] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0218] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0219] 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," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0220] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0221] A base station can accommodate one or more (e.g., 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 be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0222] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0223] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0224] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0225] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as uplink channel and downlink channel may be read as sidelink channel.

[0226] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0227] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0228] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0229] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0230] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0231] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0232] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0233] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0234] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0235] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0236] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0237] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0238] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0239] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0240] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

[0241] This application is based on Japanese Patent Application No. 2021-17791, filed February 5, 2021, the contents of which are incorporated herein in their entirety.

Claims

1. A method for providing a mobile station with a wireless LAN, comprising: receiving a radio resource control (RRC) signaling for configuring multiple cell radio network temporary identifier (C-RNTI) candidates for layer 1 / layer 2 (L1 / L2) inter-cell mobility; A terminal having a control unit that controls transmission and reception using at least one of the multiple C-RNTIs.

2. A method for providing a mobile station using a wireless LAN, comprising: receiving Radio Resource Control (RRC) signaling that configures a plurality of Cell Radio Network Temporary Identifier (C-RNTI) candidates for layer 1 / layer 2 (L1 / L2) inter-cell mobility; A wireless communication method for a terminal, comprising: a step of controlling transmission and reception using at least one of the plurality of C-RNTIs.

3. A method for providing a mobile station according to claim 1, further comprising: transmitting a radio resource control (RRC) signaling for configuring a plurality of cell radio network temporary identifier (C-RNTI) candidates for layer 1 / layer 2 (L1 / L2) inter-cell mobility; A base station having a control unit that controls transmission and reception using at least one of the multiple C-RNTIs.

4. A system having a terminal and a base station, The terminal a receiver for receiving Radio Resource Control (RRC) signaling for configuring a plurality of Cell Radio Network Temporary Identifier (C-RNTI) candidates for layer 1 / layer 2 (L1 / L2) inter-cell mobility; a control unit that controls transmission and reception using at least one of the plurality of C-RNTIs; The base station A system comprising a transmitter that transmits the RRC signaling.

Images