Terminal device, base station device, and communication system

Abstract

This terminal device comprises a reception unit and a control unit. The reception unit receives a first signal and a first reference signal. Processing is controlled, the processing involving: determining a first reference signal resource corresponding to the first reference signal set after a first time has elapsed from a first timing at which the first signal was received; and determining the first reference signal received in the first reference signal resource as the reference signal.

Description

Terminal equipment, base station equipment, and communication systems

[0001] This disclosure relates to terminal equipment, base station equipment, and communication systems.

[0002] In current networks, mobile device traffic (smartphones and feature phones) accounts for the majority of network resources. Furthermore, the amount of traffic used by mobile devices is expected to continue to increase. In addition to traffic used by mobile devices, IoT (Internet of Things) services (e.g., transportation systems, smart meters, monitoring systems for devices, etc.) are also being deployed. Therefore, networks are required to support services with diverse requirements. To support such diverse services, the communication standards for fifth-generation mobile communication (5G or NR (New Radio)) have been developed. For example, in non-patent literature (1-14), standards have been formulated that anticipate support for many use cases classified as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication), in addition to the standard technologies of 4G (fourth-generation mobile communication).

[0003] Furthermore, the Third Generation Partnership Project (3GPP: 3) is an international standardization project. rd The working group of the Generation Partnership Project (registered trademark) is currently continuing to consider and standardize extensions to the above communication standards.

[0004] For example, a 3GPP working group considered the technology of LTM (Lower layer Triggered Mobility, or L1 / L2 Triggered Mobility), and LTM was introduced in Release 18.

[0005] 3GPP TS 37.324 v18.0.03GPP TS 37.340 v18.4.03GPP TS 38.201 v18.0.03GPP TS 38.202 v18.4.03GPP TS 38.211 v18.5.03GPP TS 38.212 v18.5.03GPP TS 38.213 v18.5.03GPP TS 38.214 v18.5.03GPP TS 38.215 v18.4.03GPP TS 38.300 v18.4.03GPP TS 38.321 v18.4.03GPP TS 38.322 v18.2.03GPP TS 38.323 v18.4.03GPP TS 38.331 v18.4.0

[0006] The LTM introduced in Release 18 triggers cell switching at the physical layer of the terminal device, for example. Furthermore, for LTM introduced in Release 18, the terminal device performs channel measurements of candidate cells for cell switching using SSB (Synchronization Signal / PBCH Block). However, channel measurements using SSB have a wider beam width than channel measurements using CSI-RS (Channel State Information - Reference Signal). Therefore, the terminal device acquires CSI (Channel State Information) before performing a cell switch in response to channel measurements using SSB. While CSI-RS is used to acquire CSI, it is necessary to consider factors such as CSI processing time and identifying the CSI-RS to be measured. For example, if CSI processing time is not considered, the terminal device may not be able to report the measured CSI.

[0007] The disclosed technology was made in view of the above and provides a method for reporting acquired CSIs in LTM.

[0008] One aspect of the present invention provides a terminal device having a control unit that controls the process of determining a first reference signal resource corresponding to a first reference signal set after a first time has elapsed from a first timing of receiving a first signal, and determining the first reference signal received by the first reference signal resource as the reference signal.

[0009] The terminal device will be able to report the acquired CSI in LTM.

[0010] Figure 1 shows an example of a wireless communication system in Embodiment 1. Figure 2 shows an example of a functional configuration diagram of a base station device. Figure 3 shows an example of a functional configuration diagram of a terminal device. Figure 4 shows an example of a slot configuration. Figure 5 shows an example of the relationship between value μ, slot, frame, and subframe. Figure 6 shows an example of LTM cell switch processing in the MAC layer of terminal device 200. Figure 7 shows an example of a cell switching procedure. Figure 8 shows an example of determining a CSI reference resource for periodic / semi-persistent CSI reporting in the embodiment. Figure 9 shows an example of a method for determining a CSI reference resource and / or CSPU after CSC reception. Figure 10 shows an example of performing measurements before CSC reception. Figure 11 shows an example of the hardware configuration of a base station device. Figure 12 shows an example of the hardware configuration of a terminal device.

[0011] Hereinafter, this embodiment will be described in detail with reference to the drawings. The problems and embodiments described herein are examples and do not limit the scope of the rights of this application. In particular, even if the wording of the description is different, if it is technically equivalent, the technology of this application can be applied even with different wording and does not limit the scope of the rights. Furthermore, each embodiment can be combined as appropriate, as long as the processing content is not contradictory.

[0012] Furthermore, the terminology and technical content used in this specification may be appropriately adapted from the terminology and technical content described in specifications and contributions of communication standards such as 3GPP. Examples of such specifications are those described in Non-Patent Documents 1 to 14.

[0013] The embodiments of the base station equipment, terminal, and communication system (wireless communication system) disclosed in this application will be described in detail below with reference to the drawings. The following embodiments are not intended to limit the disclosed technology. Embodiment 1

[0014] Figure 1 shows an example of a wireless communication system 1 in Embodiment 1. The wireless communication system 1 includes a base station device 100A, a base station device 100B, a terminal device 200A, a terminal device 200B, and a terminal device 200C. Base station device 100A forms cell C10. Base station device 100B forms cell C11. The terminal devices 200 are located within the coverage of at least one base station device 100. Hereinafter, when base station device 100A and base station device 100B are not distinguished, they will simply be referred to as base station device 100. Similarly, when terminal devices 200A, terminal device 200B, and terminal device 200C are not distinguished, they will simply be referred to as terminal device 200.

[0015] Cell C10 may be referred to as the coverage of base station equipment 100A. Similarly, cell C11 may be referred to as the coverage of base station equipment 100B.

[0016] Furthermore, the base station equipment 100 may be small wireless base station equipment such as macro wireless base station equipment and pico wireless base station equipment (including micro wireless base station equipment and femto wireless base station equipment, etc.), as well as wireless base station equipment of various sizes, and may be described as wireless communication equipment, communication equipment and transmitting equipment, etc. Also, the terminal equipment 200 may be wireless terminals such as mobile phones, smartphones, PDAs (Personal Digital Assistants), personal computers, and various devices and equipment (sensor devices, etc.) with wireless communication functions such as vehicles, and may be described as wireless communication equipment, communication equipment, receiving equipment and mobile stations, etc.

[0017] The base station device 100 is connected to the network via a wired connection with network devices (higher-level devices and other base station devices) not shown in the diagram. Alternatively, the base station device 100 may be connected to the network devices wirelessly instead of via a wired connection.

[0018] The base station equipment 100 may separate its wireless communication function with the terminal equipment 200 from its digital signal processing and control functions into separate devices. In this case, the device with the wireless communication function can be called an RRH (Remote Radio Head), and the device with the digital signal processing and control functions can be called a BBU (BaseBand Unit). The RRH may be installed as an extension from the BBU, and these devices may be connected by a wired connection such as an optical fiber, or by a wireless connection. Furthermore, the base station equipment 100 may not only be separated as described above as the RRH and BBU, but may also be separated into, for example, a CU (Central Unit), a DU (Distributed Unit), and a RU (Radio Unit). The CU may include, for example, the functions of the RRC (Radio Resource Control) layer. The CU may also include, for example, the functions of the PDCP (Packet Data Convergence Protocol) layer. The CU may also include, for example, the functions of the SDAP (Service Data Adaptation Protocol) layer. The DU may include, for example, the functions of the MAC (Medium Access Control) layer. Furthermore, the DU may include, for example, the functionality of the RLC (Radio Link Control) layer. The RU also includes at least an RF radio circuit. The DU and RU may be integrated into a single unit.

[0019] Meanwhile, the terminal device 200 communicates with the base station device 100 via wireless communication.

[0020] Furthermore, if an RRC connection has not been established between the base station device 100 and the terminal device 200, the base station device 100 will perform a process to establish an RRC connection. The process to establish an RRC connection may include a random access procedure.

[0021] Next, the base station device 100 will be described. Figure 2 is a diagram showing an example of the functional configuration of the base station device 100 in this embodiment. The base station device 100 includes a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

[0022] The wireless communication unit 110 is composed of a transmission unit 111 and a reception unit 112, and performs wireless communication with a terminal device 200. Specifically, the transmission unit 111 transmits data signals and control signals via wireless communication through an antenna. Note that the antenna may be common for transmission and reception. The transmission unit 111 transmits downlink signals such as a random access procedure signal, a downlink physical signal, an RRC layer signal, a downlink data signal, and a downlink control signal to the terminal device 200, for example.

[0023] Furthermore, the reception unit 112 can receive uplink signals transmitted from the terminal device 200, such as a random access procedure signal, an RRC layer signal, an uplink data signal, and an uplink control signal, for example.

[0024] The control unit 120 controls the base station apparatus 100. Specifically, the control unit 120 can perform control such as controlling establishment of an RRC connection with the terminal device 200, signal processing of signals received by the reception unit 112, generating a transport block (TB), and mapping the transport block to radio resources. Furthermore, the control unit 120 can perform control related to LTM. For example, the control unit 120 performs control to transmit a signal instructing measurement of a measurement signal of a handover target cell via the transmission unit 111.

[0025] The storage unit 130 can store, for example, a downlink data signal.

[0026] The communication unit 140 connects to and communicates with a network device (e.g., a higher-level device or another base station device) via a wired or wireless connection. Furthermore, a data signal addressed to the terminal device 200 received by the communication unit 140 can be stored in the storage unit 130.

[0027] Next, a terminal device 200 will be described. FIG. 3 is a diagram showing an example of a functional configuration diagram of the terminal device 200 according to the present embodiment. As shown in FIG. 3, the terminal device 200 includes a communication unit 210, a control unit 220, and a storage unit 230. Each of these components is connected so that signals and data can be input and output in one direction or two directions. Note that the communication unit 210 can be described separately as a transmission unit 211 and a reception unit 212.

[0028] The transmission unit 211 transmits data signals and control signals by wireless communication via an antenna. Note that the antenna may be common for transmission and reception. Further, the transmission unit 211 transmits uplink signals such as, for example, a signal for a random access procedure, an RRC layer signal, an uplink data signal, and an uplink control signal.

[0029] The reception unit 212 receives downlink signals transmitted from the base station device 100, such as a signal for a random access procedure, a downlink data signal, and a downlink control signal. Further, the received signal may include, for example, a reference signal used for channel estimation or demodulation.

[0030] The control unit 220 controls the terminal device 200. Specifically, the control unit 220 can control establishment of an RRC connection with the base station device 100, signal processing of signals received by the reception unit 212, generation of a transmission block (TB), mapping of the transmission block to radio resources, and the like. Further, the control unit 220 is controlled to perform control related to LTM. For example, the control unit 220 measures a measurement signal transmitted from the base station device 100B that is a cell switching destination, and performs control to report the measurement result to the base station device 100A.

[0031] The storage unit 230 can store, for example, an uplink data signal. Further, the storage unit 230 can store configuration information (or setting information) related to wireless communication transmitted from the base station device 100. Note that the configuration information is, for example, configuration information of a CSI-RS resource or a report, or information related to LTM.

[0032] Furthermore, the communication unit 110 of the base station device 100 and the communication unit 210 of the terminal device 200 may be configured to include an antenna port.

[0033] The uplink may also be called the uplink. The downlink may also be called the downlink. The uplink may also be the communication link that the terminal device 200 transmits to the base station device 100. The uplink may also include the uplink channel and the uplink signal. The downlink may also be the communication link that the base station device 100 transmits to the terminal device 200. The downlink may also include the downlink channel and the downlink signal.

[0034] The uplink channel may include some or all of the following: PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), and SRS (Sounding Reference Signal).

[0035] The uplink signal may be a signal transmitted via PUSCH, PUCCH, PRACH, and SRS.

[0036] The downlink channel may include some or all of the following: PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), PBCH (Physical Broadcast Channel), SSB (Synchronization Signal Block), and CSI-RS (Channel State Information - Reference Signal).

[0037] The downlink signal may be a signal transmitted via PDSCH, PDCCH, PBCH, SSB, and CSI-RS. The downlink signal may also include a downlink reference signal. The SSB may be an SS (Synchronization Signal) / PBCH block.

[0038] The higher-level parameters may include some or all of the parameters of the RRC parameters, MAC CE (Medium Access Control Control Element), SIB (System Information Block), and MIB (Master Information Block).

[0039] Here, we will describe an example of slots for the base station device 100 and terminal device 200 to perform wireless communication.

[0040] Figure 4 shows an example of the slot configuration in this embodiment. The radio frame shown in Figure 4 may be, for example, 10 milliseconds (msec). The radio frame may also be referred to as a frame. Furthermore, the radio frame may also be referred to as a system frame. In addition, the radio frame is composed of, for example, 10 subframes.

[0041] In the wireless frame shown in Figure 4, for example, the length of the time axis of the wireless frame is determined according to the subcarrier spacing (SCS). For example, the subcarrier spacing is SCS = 15 x 2 μ It is determined by the relationship in (kHz). For example, μ=0 means that the subcarrier spacing is 15kHz. In the following, μ may be referred to as the value μ or the value μ that determines the subcarrier spacing.

[0042] Furthermore, in 15 kHz subcarrier spacing, one frame may include 10 slots. One slot includes, for example, 14 OFDM symbols. An OFDM symbol is composed of, for example, a plurality of physical resource blocks (PRB: Physical Resource Block). One physical resource block may be composed of, for example, 12 subcarriers.

[0043] Furthermore, a slot is numbered using, for example, subcarrier spacing μ, n s μ is numbered. n s μ is numbered in ascending order within the range of {0, 1, 2, ..., N slot subframe,μ-1} in one subframe. n s μ is numbered in ascending order within the range of {0, 1, 2, ..., N slot frame,μ -1} in one frame (Increasing order). One slot includes N symb slot OFDM symbols. The value of N symb slot may vary depending on the length of a cyclic prefix (CP: Cyclic Prefix).

[0044] FIG. 5 is a diagram showing an example of the relationship among the value μ, slots, frames and subframes in the present embodiment. Normal CP may be adopted for all values μ. Also, Extended CP may be adopted when μ=2. The length of CP in the time domain may be shorter for Normal CP than for Extended CP. In addition, FIG. 5 shows the number of slots N included in one radio frame for the value μ slot frame,μThis shows an example of the number of slots contained in one subframe at a value μ. For Normal CP, for example, one slot contains 14 OFDM symbols. For Extended CP, for example, one slot contains 12 OFDM symbols. In this embodiment, unless otherwise specified, it is assumed that Normal CP is used. The technology in this embodiment is applicable to both Normal CP and Extended CP.

[0045] Subcarrier spacing may also be called numerology. Different numerology may correspond to different subcarrier spacing.

[0046] A time resource may consist of one or more OFDM symbols. Alternatively, a time resource may consist of one or more slots. Furthermore, a time resource may consist of one or more system frames.

[0047] The frequency resource may be one or more subcarriers. Alternatively, the frequency resource may be one or more PRBs.

[0048] The channel on which a certain symbol is transmitted on an antenna port may be defined as being able to infer the channels on which other symbols are transmitted on the same antenna port. That is, multiple symbols transmitted on the same antenna port but at different time instances can be considered to have been transmitted on the same channel.

[0049] If the large-scale property of a channel on which a certain symbol is transmitted on one antenna port allows for the inference of a channel on which a different symbol is transmitted on the other antenna port, then the two antenna ports may be said to be a Quasi Co-Location (QCL). The large-scale property may include one or more delay spreads, a Doppler spread, a Doppler shift, an average gain, an average delay, and some or all of the spatial reception parameters.

[0050] In each numerology and carrier, the resource grid is N grid,x size,μ ×N sc RB Individual subcarriers and N symb A subframe may be defined by μ OFDM symbols. sc RB This can also be the number of subcarriers that make up one PRB. sc RB It may be 12.

[0051] FR1 (Frequency Range 1) may have a carrier frequency of less than 6 GHz. Conversely, FR2 may have a carrier frequency of 6 GHz or higher.

[0052] TDD (Time Division Duplex) may also be called an unpaired spectrum.

[0053] A random access preamble sequence supports one or more different lengths. These lengths may include 139, 571, 839, or 1151.

[0054] A random access preamble sequence of length 839 may be applied to part or all of a 1.25 kHz and / or 5 kHz SCS. A random access preamble sequence of length 139 may be applied to SCSs of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 480 kHz, and 960 kHz. A random access preamble sequence of length 571 may be applied to part or all of a 30 kHz and / or 120 kHz and / or 480 kHz SCS. A random access preamble sequence of length 1151 may be applied to part or all of a 15 kHz and / or 120 kHz SCS.

[0055] Next, TDD will be described. In TDD, the base station device 100 may determine the slot format. In TDD, the base station device 100 may also transmit slot format configuration information to the terminal device 200. In TDD, the terminal device 200 may determine the slot format based on the slot format configuration information. In TDD, the base station device 100 may also store the slot format of the terminal device 200 in the cell included in the base station device 100. In TDD, the slot format configuration information may consist of one or more upper-layer parameters or one or more physical layer signals.

[0056] In a downlink slot and / or downlink symbol, the terminal device 200 may receive downlink channels and / or downlink signals. For example, the terminal device 200 may receive PDSCH, PDCCH, PBCH, CSI-RS, or SSB in a downlink slot and / or downlink symbol. Also, in an uplink slot and / or uplink symbol, the terminal device 200 may receive uplink channels and / or uplink signals. For example, the terminal device 200 may transmit PUSCH, PUCCH, PRACH, or SRS in an uplink slot and / or uplink symbol. Also, in a flexible slot and / or flexible symbol, the terminal device 200 may receive downlink channels or downlink signals scheduled in DCI format. Also, in a flexible slot and / or flexible symbol, the terminal device 200 may transmit uplink channels or uplink signals scheduled in DCI format. Furthermore, in the flexible slot and / or flexible symbol, the terminal device 200 may transmit PRACH.

[0057] The terminal device 200 may configure downlink symbols based on the upper-layer parameters tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated. The terminal device 200 may also configure uplink symbols based on the upper-layer parameters tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated. The terminal device 200 may also configure flexible symbols based on the upper-layer parameters tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated.

[0058] In a set of symbols for a slot that is indicated as flexible by tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated, if the terminal device 200 is not configured to monitor PDCCH in DCI format 2_0, or if tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated are not provided to the terminal device 200, the terminal device 200 may receive PDSCH or CSI-RS in the set of symbols for the slot if the terminal device 200 receives the corresponding instruction in DCI format.

[0059] A terminal device 200 configured to operate in the Bandwidth Part (BWP) of a serving cell may have up to four sets of BWPs configured by the upper layers of the serving cell. The BWP set may include an uplink BWP (UL BWP) and a downlink BWP (DL BWP). The DL BWP may be used by the terminal device 200 for reception in the downlink bandwidth. The DL BWP may be configured based on the upper layer parameter BWP-Downlink, or based on the upper layer parameter initialDownlinkBWP using a set of parameters configured by the upper layer parameters tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated. The UL BWP may be used by the terminal device 200 for transmission in the uplink bandwidth. The UL BWP may be configured based on the upper layer parameter BWP-Uplink, or based on the upper layer parameter initialUplinkBWP using a set of parameters configured by the upper layer parameters BWP-UplinkCommon and / or BWP-UplinkDedicated.

[0060] The terminal device 200 may transmit the uplink channel and / or uplink signal in the UL BWP. The terminal device 200 may also receive the downlink channel and / or downlink signal in the DL BWP.

[0061] The serving cell may be the cell to which the terminal device 200 is connected. The candidate cell may be a cell that could potentially be the target of the terminal device 200's cell switching. The terminal device 200 may also have one or more candidate cells set. The target cell may be a cell included in the cell switching instruction. The target cell may also be the target cell that the terminal device 200 switches to. The cell switching may also be referred to as an LTM cell switch.

[0062] Here, we will explain the LTM processing flow.

[0063] The terminal device 200 may be indicated by the upper-layer parameter LTM-Config with one or more candidate cells and one or more SSBs for each of those candidate cells. The SSBs may be indicated for the terminal device 200 to acquire synchronization and / or to measure some or all of the one or more L1-RSRPs and / or L1-SINRs corresponding to the SSBs. The terminal device 200 may also be indicated by the upper-layer parameter LTM-Config with one or more candidate cells and one or more CSI-RSs for each of those candidate cells. The CSI-RSs may be indicated for the terminal device 200 to acquire synchronization and / or to measure some or all of the one or more L1-RSRPs and / or L1-SINRs using the CSI-RSs.

[0064] The LTM cell switch command MAC CE may be a command that instructs the terminal device 200 to switch cells. The LTM cell switch command MAC CE may also be referred to as CSC (Cell Switch Command). The serving cell may also send the CSC to the terminal device 200. When the terminal device 200 receives the CSC, it may perform a cell switch based on the information contained in the CSC.

[0065] L1-RSRP (Layer1-Reference Signal Received Power) may be the received power of the reference signal received by the terminal device 200. Alternatively, L1-RSRP may be a value indicating radio wave strength. L1-SINR (Layer1-Signal to Interference plus Noise power Ratio) may be the ratio of the power of the desired signal to the power of signals other than the desired signal.

[0066] A MAC CE command to activate or deactivate the TCI state of a candidate cell may activate and / or deactivate the TCI state provided by the upper-level parameter Candidate-TCI-State-r18 and / or Candidate-TCI-UL-State-r18 in the candidate cell. The TCI state may also be associated with the SSB or TRS of the corresponding candidate cell.

[0067] If a candidate cell's TCI activation or deactivation MAC CE command activates one or more TCI states, the CSC may indicate one TCI state from among the activated one or more TCI states. On the other hand, if a candidate cell's TCI state activation or deactivation MAC CE command does not activate one or more TCI states, the CSC may indicate to activate one TCI state from among the one or more TCI states provided by the higher-level parameters Candidate-TCI-State-r18 and / or Candidate-TCI-UL-State-r18.

[0068] After receiving a CSC from the base station device 100, the terminal device 200 may deactivate TCI states other than the TCI state indicated by the CSC.

[0069] The terminal device 200 may provide report configuration information for reporting L1-RSRP and / or L1-SINR measurement results via the upper-layer parameter LTM-CSI-ReportConfigToAddModList. This report configuration information may include the number of candidate cells and the number of SSB and / or CSI-RS for each candidate cell contained within the candidate cells.

[0070] If, in one candidate cell, the upper layer parameter ltm-UE-MeasuredTS-ID and / or the upper layer parameter ltm-ServingCellUE-MeasuredTA-ID of the serving cell are provided to the terminal device 200, and the two upper layer parameters have the same value, the terminal device 200 may estimate a timing advance (TA) to apply to the first transmission on the candidate cell after receiving a CSC instructing a cell switch to the candidate cell, provided that predetermined conditions are met.

[0071] The terminal device 200 may be provided with parameters for PRACH transmission in one or more candidate cells by the higher-layer parameter EarlyUL-SyncConfig. The terminal device 200 may also be triggered to transmit PRACH in a candidate cell by a PDCCH Order. The terminal device 200 may also receive the PDCCH Order from the serving cell. The PDCCH Order may also include an indication of which candidate cell will transmit PRACH.

[0072] The PDCCH order may be an instruction from the base station device 100 to the terminal device 200 to transmit a PRACH using a PDCCH that includes a DCI. The DCI may also include information about candidate cells to which the PRACH should be transmitted.

[0073] If the serving cell and the candidate cell are operating in the same frequency band, and the terminal device 200 performs uplink transmissions that overlap in time to both cells, and the terminal device 200 does not support uplink transmissions that overlap in time, the terminal device 200 does not need to transmit on the serving cell.

[0074] If the serving cell and the candidate cell are operating in the same frequency band, and the terminal device 200 performs uplink transmissions that overlap in time to both cells, and the terminal device 200 supports uplink transmissions that overlap in time, the terminal device 200 may prioritize the power allocation of PRACH transmissions on the candidate cell.

[0075] If the serving cell and the candidate cell operate in the same frequency band, and the terminal device 200 makes uplink transmissions that overlap in time to both cells, and the gap between the uplink transmissions of the candidate cell and the serving cell is less than N symbols, then the terminal device 200 does not need to transmit on the serving cell. The gap may be the number of symbols between the last symbol of the uplink transmission on the serving cell and the first symbol of the PRACH transmission on the candidate cell. Alternatively, the gap may be the number of symbols between the last symbol of the PRACH transmission on the candidate cell and the first symbol of the uplink transmission on the serving cell.

[0076] If the serving cell and the candidate cell are operating in the same frequency band, and the terminal device 200 performs uplink transmissions that overlap in time with both cells, and the interval between the uplink transmissions of the candidate cell and the serving cell is less than N symbols, and the total transmission power of the terminal device 200 in the frequency band in which the uplink transmissions are performed exceeds the upper limit, the terminal device 200 may prioritize the power allocation for PRACH transmissions on the candidate cell.

[0077] The terminal device 200 may transmit PRACH to the candidate cell with a predetermined transmission power.

[0078] The terminal device 200 may, in a serving cell, be provided with the upper-layer parameter CandidateTCI-State, included in the upper-layer parameter ltm-DL-OrJointTCI-StateToAddModList, and / or the upper-layer parameter CandidateTCI-UL-State, included in the upper-layer parameter ltm-UL-TCI-StateToAddModList, by the CSC included in the PDSCH reception. The upper-layer parameter CandidateTCI-State and / or CandidateTCI-UL-State may indicate a TCI state applicable to uplink transmission and / or downlink reception in one candidate cell from among one or more candidate cells. The one candidate cell may be determined by the CSC. The one candidate cell may also be indicated by the CSC. The one candidate cell may also be referred to as a target cell.

[0079] The terminal device 200 may assume that one or more DMRS (Demodulation Reference Signal) antenna ports for PDCCH reception and PDSCH reception are SSB, TRS, and / or CSI-RS and QCL included in the TCI state. The QCL may have type A and / or type D attributes.

[0080] The terminal device 200 does not need to expect QCL type A to be notified if the SSB is configured as the source reference signal for the TCI state.

[0081] If the CandidateTCI-State and / or CandidateTCI-UL-State are provided to the terminal device 200 by the CSC, the terminal device 200 will send a HARQ-ACK corresponding to the PDSCH reception containing the CSC after the last symbol of the PUCCH or PUSCH, LTM-RRC-processing +T LTM-processing +T first-RS +T RS-procCandidateTCI-State and / or CandidateTCI-UL-State may be applied within +3 msec. Here, T LTM-RRC-processing This may be the time required for decoding the RRC configuration information of the target cell as instructed by the CSC and for validity and / or compliance checks. LTM-processing This may also be the processing time on the terminal device side, consisting of applying the target cell parameters and L1 / L2 changes. first-RS This is the time for fine time tracking and obtaining complete timing information for the target cell. RS-proc This could be the SSB processing time. msec (millisecond) could be 1 / 1000th of a second. For example, 3 msec in this case is 3 / 1000th of a second.

[0082] In the case of RACH-based LTM, the terminal device 200 may apply CandidateTCI-State to receptions on candidate cells and apply a spatial filter corresponding to CandidateTCI-State and / or CandidateTCI-UL-State to transmissions on candidate cells from the completion of the random access procedure related to PRACH transmission on candidate cells until a new TCI state is instructed to the candidate cells.

[0083] In the case of RACH-less LTM, the terminal device 200 may apply CandidateTCI-State to receptions on candidate cells and apply a spatial domain filter corresponding to CandidateTCI-State and / or CandidateTCI-UL-State to transmissions on candidate cells until a new TCI state is instructed for the candidate cell.

[0084] The base station device 100 may also notify the terminal device 200 that it will perform the LTM cell switch procedure by transmitting a CSC. This notification may be made by a MAC entity.

[0085] Figure 6 shows an example of an LTM cell switch procedure in the MAC layer of terminal device 200. The serving cell is assumed to belong to base station device 100. The MAC layer may also include MAC entities that perform processing in the MAC layer. Furthermore, some or all of the lower layer, MAC layer, and / or upper layer may be included in terminal device 200. The lower layer may also be the physical layer. The upper layer and / or MAC layer may also be included in the upper layer. The lower layer, MAC layer, and upper layer may also be included in terminal device 200. Furthermore, the lower layer, MAC layer, and upper layer shown in Figure 6 may be implemented, for example, according to the control of control unit 220. The lower layer may also be, for example, the physical layer. The upper layer may also be, for example, the RLC (Radio Link Control) layer, the PDCP (Packet Data Convergence Protocol) layer, and the RRC (Radio Resource Control) layer.

[0086] The lower layer of terminal device 200 receives the CSC included in the PDSCH transmitted via the serving cell (step S10). Then, the lower layer of terminal device 200 notifies the MAC layer of the received CSC (step S11).

[0087] When the MAC layer of terminal device 200 receives the CSC, it instructs or notifies the upper layer of terminal device 200 that a cell switch has been triggered and provides the Target configuration ID contained in the CSC (step S12). The Target configuration ID may include the cell index that is the target of the cell switch.

[0088] The MAC layer of terminal device 200 receives instructions or notifications regarding MAC processing from the upper layer of terminal device 200 (step S13). Then, the MAC layer of terminal device 200 performs MAC processing, which is MAC layer processing, in response to the instructions or notifications regarding MAC processing (step S14). MAC processing is, for example, the execution of the received Timing advance command (TA command) if a MAC reset is performed and the value of the Timing advance command (TA command) included in CSC is not FFF. The TA command is, for example, processing that assumes a RACH-less LTM cell switch is being performed. Furthermore, if the MAC processing is associated with an SCG (Secondary Cell Group), the MAC layer may notify or indicate to the upper layer that it will skip the random access procedure for the cell switch (step S15).

[0089] Furthermore, MAC processing includes, for example, processing of the measured TA command if a MAC reset is performed, TA measurement is configured, and the terminal device 200 successfully measures the TA in one or more specified cells (candidate cells). Processing of the TA command is, for example, processing that assumes a RACH-less LTM cell switch is being performed. If the MAC processing is associated with the SCG, the MAC layer may notify or indicate to the upper layer that it will skip the random access procedure for the cell switch (step S15).

[0090] Furthermore, the MAC process may include a process in which the SSB associated with the TCI state indicated by the TCI state ID included in the CSC is assumed to be the SSB used in the RACH-less LTM cell switch to select the configured uplink grant for the initial uplink transmission to the candidate cell.

[0091] The MAC layer notifies or instructs the lower layers regarding information about the TCI state information contained in the CSC (step S16).

[0092] Here, we will explain the parameters for channel measurement.

[0093] In CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), CRI (CSI-RS Resource Indicator), SSBRI (SS / PBCH Block Resource Indicator), LI (Layer Indicator), RI (Rank Indicator), L1-RSRP, L1-SINR, Capability Index, and / or TDCP (Time Domain Channel Properties), the terminal device 200 may have a list of one or more trigger states provided by the upper layer through one or more upper layer parameters CSI-ReportConfig reporting settings, one or more upper layer parameters LTM-CSI-ReportConfig reporting settings, one or more upper layer parameters CSI-ResourceConfig resource settings, one or more upper layer parameters LTM-CSI-ReportConfig resource settings, the upper layer parameters CSI-AperiodicTriggerStateList, and / or CSI-SemiPersistentOnPUSCH-TriggerStateList, in whole or in part.

[0094] Each trigger state included in the upper-level parameter CSI-AperiodicTriggerStateList may include a list of upper-level parameters CSI-ReportConfig or LTM-CSI-ReportConfig that indicate resource set IDs for channel measurements and / or resource set IDs for interference measurements. The IDs may also be indices. Furthermore, resource sets for interference measurements may only exist in the report configuration provided by the upper-level parameter CSI-ReportConfig. Additionally, if the associated CSI-ReportConfig consists of a list of sub-configurations, a trigger state may include one or more upper-level parameters csi-ReportSubConfigID.

[0095] Each trigger state included in the higher-level parameter CSI-SemiPersistentOnPUSCH-TriggerStateList may include one associated CSI-ReportConfig or LTM-CSI-ReportConfig. If the associated CSI-ReportConfig consists of a list of sub-configurations, a trigger state may also include one or more higher-level parameters csi-ReportSubConfigurationID.

[0096] Each report setting of the upper layer parameter LTM-CSI-ReportConfig may include parameters for time-domain operation provided by the upper layer parameter ltm-ReportConfigType, the number of candidate cells provided by the upper layer parameter nrOfReportedCells, and / or the number of reference signals per candidate cell provided by nrOfReportedRS-PerCell. If the upper layer parameter spCellInclusion is set, each report setting of the upper layer parameter LTM-CSI-ReportConfig may include L1 (Layer 1) measurement results associated with the current SpCell.

[0097] The time-domain operation of the terminal device 200, configured by the upper-layer parameter LTM-CSI-ReportConfig, is indicated by the upper-layer parameter ltm-ReportConfigType and may be set to one of the following values: upper-layer parameter periodic, upper-layer parameter semiPersistentOnPUCCH, upper-layer parameter semiPersistentOnPUSCH, or upper-layer parameter aperiodic. If the upper-layer parameter periodic is set, the terminal device 200 may periodically transmit CSI reports to the base station device 100 (serving cell). The CSI reports may include measurement results. Also, if the upper-layer parameter semiPersistentOnPUCCH is set, the terminal device 200 may periodically transmit CSI reports to the base station device 100 (serving cell) using PUCCH from the time it receives an instruction from the base station device 100 to start transmitting CSI reports until it receives an instruction to stop transmitting CSI reports. Furthermore, if the upper layer parameter semiPersistentOnPUSCH is set, the terminal device 200 may periodically send CSI reports to the base station device 100 (serving cell) using PUSCH from the time it receives an instruction from the base station device 100 to start CSI report transmission until it receives an instruction to stop CSI report transmission. Also, in the CSI report of the upper layer parameter periodic, semiPersistentOnPUCCH, and semiPersistentOnPUSCH, the set period and set slot offset may be applied to the Numerology of the UL BWP configured to send CSI reports. Also, in the CSI report of the upper layer parameter periodic, semiPersistentOnPUCCH, and semiPersistentOnPUSCH, the report period and slot offset may be derived based on the Numerology of the UL BWP to which the CSI reports are sent.

[0098] In a terminal device 200 where the upper-layer parameter LTM-CSI-ReportConfig is set, for L1-RSRP measurement, one or all of the aperiodic, semi-persistent, or periodic CSIs may be associated with one resource setting specified by the upper-layer parameter ltm-ResourceForChannelMeasurement.

[0099] Figure 7 shows an example of a cell switching procedure. Specifically, the first cell is, for example, a cell belonging to base station equipment 100. The first cell may also be a serving cell. For example, the first cell is cell C10 formed by base station equipment 100A. For example, the second cell is cell C11 formed by base station equipment 100B. In the explanation of Figure 7, the first cell and the second cell may be replaced with base station equipment 100. This procedure may also be applied when there are multiple candidate cells.

[0100] The terminal device 200 receives first information from the first cell, which includes information about the second cell, a candidate cell (step S20). This first information is, for example, configuration information necessary for uplink transmission and / or downlink reception in the second cell. The first information may also be, for example, the upper layer parameter CSI-MeasConfig in the second cell and the upper layer parameter linked to the upper layer parameter CSI-MeasConfig.

[0101] The terminal device 200 receives the SSB and / or CSI-RS transmitted from the second cell based on the first information received in S20 and performs channel measurement (step S21). The terminal device 200 may then transmit the measurement results performed in step S21 to the first cell (step S22). The first cell may transmit a PDCCH Order to the terminal device 200 (step S23) and instruct the second cell to transmit a PRACH. Here, the configuration information necessary for the PRACH transmission may be set based on the first information. The terminal device 200 may then transmit a PRACH to the second cell based on the first information (step S24). The RACH Occasion used for the PRACH transmission may be a RACH Occasion linked to the SSB index included in the PDCCH Order. The transmission of a PRACH by the terminal device 200 in step S24 may be referred to as RACH-based LTM. In step S24, the terminal device 200 does not have to transmit a PRACH, and the failure to transmit the PRACH before receiving the CSC may be referred to as RACH-less LTM. In the case of RACH-based LTM, the second cell may receive the PRACH transmitted by the terminal device 200 in step S24, measure the TA information, and transmit the information regarding the TA to the first cell (step S25). The TA command may be derived from the TA information. The information regarding the TA may also include the TA information and / or the TA command.

[0102] The first cell may activate the TCI state to the terminal device 200 (step S26). Step S26 is optional. The first cell may then transmit a CSC to the terminal device 200 and instruct it to switch to the second cell (step S27). The terminal device 200 may also transmit a PRACH to the second cell (step S28). If the terminal device 200 transmitted a PRACH in step S24, it does not need to transmit a PRACH in step S28. Also, if the value of the TA command included in the CSC is anything other than FFF, the terminal device 200 does not need to transmit a PRACH in step S28. The terminal device 200 may then start an uplink transmission to the second cell (step S29). The second cell may then instruct the terminal device 200 to measure the beam using CSI-RS (step S30). The first cell may also be described as the base station equipment 100 that forms the first cell. Similarly, the second cell may be described as the base station equipment 100 that forms the second cell.

[0103] The cell switching procedure shown in Figure 7 involves, for example, the measurement of a beam using CSI-RS being instructed in step S30, followed by the measurement of the beam using CSI-RS. The terminal device 200 may transmit the acquired channel information (CSI: Channel State Information) from the beam measurement to the target cell. The base station device 100 can perform high-throughput communication by setting transmission parameters for the downlink based on the CSI. These transmission parameters may be MCS. However, between the time the terminal device 200 receives the CSC and measures the beam, and then pairs the optimal beam (beam pairing), a decrease in cell switching performance, such as a decrease in throughput, may occur. Therefore, the terminal device 200 may perform a measurement to acquire the CSI before receiving the CSC in S27. For example, the terminal device 200 may perform a measurement to acquire the CSI in step S31, or in step S32. Alternatively, the terminal device 200 may perform a measurement to acquire the CSI after receiving the CSC in step S27. The terminal device 200 may also report the acquired CSI to the second cell. In this way, by acquiring the CSI before performing a cell switch and reporting it to the target cell, it is possible to minimize the decrease in throughput. Here, the measurement for acquiring the CSI does not need to be associated with the report.

[0104] Therefore, the terminal device 200 can reduce the probability of performance degradation due to cell switching by performing CSI acquisition, for example, before or after receiving the CSC. Whether the CSI is acquired before or after receiving the CSC depends on the capability of the terminal device 200. For example, the terminal device 200 may have a first capability that allows it to acquire (or measure) the CSI before receiving the CSC, or a second capability that does not allow it to acquire (or measure) the CSI before receiving the CSC. In other words, for example, the terminal device 200 with the first capability can perform control regarding CSI acquisition before or after receiving the CSC, and the terminal device 200 with the second capability can perform control regarding CSI acquisition after receiving the CSC. The terminal device 200 with the first capability may also have the second capability. Furthermore, the CSC may trigger the operation to acquire the CSI after receiving the CSC.

[0105] A CSI reference resource may be used to select the CSI-RS to be used for CSI acquisition. The CSI reference resource may be defined in the frequency domain by one or more DL PRBs in the frequency domains measured by the CSI to be acquired. The CSI-RS used for CSI acquisition may also be a CSI-RS transmitted in a slot containing the CSI reference resource or in a slot configured one or more slots prior to the slot containing the CSI reference resource in the time domain.

[0106] A CSI reference resource may be defined in the time domain by referencing a UL slot that reports a CSI. The index of the UL slot that reports the CSI is: This may also be the case. Specifically, in the time domain, a CSI reference resource may be defined based on a single downlink slot (DL slot) that satisfies (Equation 1) below.

[0107] (Formula 1)

[0108] This may be given by higher-level parameters. Also, the CSI reference resource has a slot index. It may be configured in a slot that is also This may be a slot index. Also, This could also be the slot index for the downlink. This may be a slot index. Specifically, This is given, for example, by (Equation 2) below.

[0109] (Formula 2)

[0110] Here This could be the Numerology of the DL slot. Also, This could be Numerology for the UL slot. Also, , , , and, This may be given by higher-level parameters.

[0111] For periodic reporting and / or semi-persistent reporting, and when one CSI-RS and / or SSB resource is configured, teeth, Among values ​​that are the same as or larger than, The smallest of which becomes a valid DL slot The value may also be . For periodic reports and / or quasi-static reports, and when multiple CSI-RS and / or SSB resources are configured, teeth, Among values ​​that are the same as or larger than, The smallest of which becomes a valid DL slot It can also be a value.

[0112] In the case of aperiodic reporting, and when terminal device 200 receives a DCI instructing a CSI report in a slot, it is instructed to send a CSI report. This value may be the same slot as the slot that received the DCI. In the case of aperiodic reporting, if the terminal device 200 is instructed to send a CSI report in a slot other than the slot that received the DCI instructing the CSI report, teeth, Among values ​​that are the same as or larger than, The smallest of which becomes a valid DL slot It may also be a value. Here, This may be a predetermined number of symbols, or it may be a different value for each terminal device 200.

[0113] A valid DL slot may be a slot designated as a downlink symbol or flexible symbol by a higher-layer parameter, and may not be a measurement gap of the terminal device 200.

[0114] Figure 8 shows an example of determining the CSI reference resource for periodic / semi-persistent CSI reporting in an embodiment. and Each of these may be 1. The slot format is, for example, composed of D, D, D, F, U, where D is a DL slot, U is a UL slot, and F is a Flexible symbol slot. When a CSI report (F801) is triggered on terminal device 200, the time-domain resource to which the CSI report (F801) is transmitted may be configured with a slot (F800) by upper-layer parameters. The CSI reference resource (F802) may also be determined based on the slot (F800). The slot in which the CSI reference resource (F802) is configured If one CSI-RS and / or SSB resource is configured, teeth, Among values ​​that are the same as or larger than, The smallest of which becomes a valid DL slot Since it is a value of , in this example, the CSI reference resource (F802) may be the slot (F803) which is 8 slots before the slot (F800).

[0115] A CSPU (CSI Processing Unit) may be defined by one or more OFDM symbol counts. Furthermore, in a CSI report configured by the upper-layer parameters CSI-ReportConfig and / or LTM-CSI-ReportConfig, if the upper-layer parameter reportQuantity is not set to none, the CSPU may occupy a predetermined number of OFDM symbols.

[0116] For periodic or quasi-static CSI reports (excluding quasi-static CSI reports transmitted on the first PUSCH after receiving a PDCCH that triggers the report, and quasi-static CSI reports on PUSCHs where the upper-layer parameter codebookType is set to typeII-Doppler-r18 or typeII-Doppler-PortSelection-r18), the CSPU may occupy the CSPU from the first symbol of the latest CSI-RS, CSI-IM, or SSB resource configured for channel or interference measurement, which is no slower than the corresponding CSI reference resource, until the last symbol of the PUSCH and / or PUCCH configured to transmit the report.

[0117] For periodic or quasi-static CSI reports (excluding quasi-static CSI reports sent on the first PUSCH after receiving a PDCCH that triggers the report, and quasi-static CSI reports on PUSCHs where the upper-layer parameter codebookType is set to typeII-Doppler-r18 or typeII-Doppler-PortSelection-r18), the CSPU may occupy the CSPU from the first symbol of each CSI-RS or CSI-IM resource associated with all subconfigurations configured for periodic CSI reports corresponding to the CSI-ReportConfig containing the list of subconfigurations provided by the upper-layer parameter csi-ReportSubConfigList, which is no later than the corresponding CSI reference resource, until the last symbol of the PUSCH and / or PUCCH configured to send the report.

[0118] For periodic or quasi-static CSI reports (excluding quasi-static CSI reports sent on the first PUSCH after receiving a PDCCH that triggers the report, and quasi-static CSI reports on PUSCHs where the upper-layer parameter codebookType is set to typeII-Doppler-r18 or typeII-Doppler-PortSelection-r18), the CSPU may occupy the CSPU from the first symbol of the latest CSI-RS or CSI-IM resource associated with each subconfiguration activated / triggered for a quasi-static CSI report corresponding to a CSI-ReportConfig containing a list of subconfigurations provided by csi-ReportSubConfigList, no later than the corresponding CSI reference resource, until the last symbol of the PUSCH and / or PUCCH configured to send the CSI report.

[0119] A non-periodic CSI report may occupy the CSPU from the first symbol after the PDCCH reception that triggers the CSI report to the last symbol of the scheduled PUSCH that transmits the CSI report. If the PDCCH reception includes two PDCCH candidates from two different search space sets, the PDCCH candidate that finishes later in time may be used to determine the CSPU.

[0120] For a quasi-static CSI report sent on the first PUSCH after a PDCCH reception that triggers the report, the CSPU may be occupied from the first symbol after the PDCCH reception to the last symbol of the scheduled PUSCH that sends the report. If the PDCCH reception includes two PDCCH candidates from two different search space sets, the PDCCH candidate that finishes later in time may be used to determine the CSPU.

[0121] For quasi-static CSI reports on PUSCH where the upper-level parameter codebookType is set to typeII-Doppler-r18 or typeII-Doppler-PortSelection-r18, the latest K is not slower than the CSI reference resource. P The CSPU may be occupied from the first symbol of the second consecutive periodic / quasi-static CSI-RS timing to the last symbol of the PUSCH that transmits the CSI report. Here, K P This value may be any of 1, 2, or 4, or it may be given by the capabilities of the terminal device 200.

[0122] In Figure 8, for periodic reports or quasi-static CSI reports (excluding quasi-static CSI reports transmitted on the first PUSCH after receiving a PDCCH that triggers the report, and quasi-static CSI reports on PUSCHs where the upper-layer parameter codebookType is set to typeII-Doppler-r18 or typeII-Doppler-PortSelection-r18), among the CSI-RS(F804) and CSI-RS(F805) that are not slower than the CSI reference resource(F802), the latest CSI-RS that is not slower than the corresponding CSI reference resource is CSI-RS(F804). Therefore, the CSPU may be determined from the first symbol on which CSI-RS(F804) is transmitted to the last symbol on which the corresponding CSI report(F801) is transmitted.

[0123] In LTM, for example, even if terminal device 200 starts a measurement to acquire CSI, the resource to which the measurement results are transmitted may not be determined. In this case, there is a problem in that terminal device 200 cannot determine the CSPU and / or CSI reference resource.

[0124] In the following explanation, a terminal device 200 having the first capability will be referred to as terminal device 200A, and a terminal device 200 having the second capability will be referred to as terminal device 200B. Furthermore, when terminal devices 200A and 200B are not distinguished, they will be referred to simply as terminal device 200.

[0125] Here, we will describe how the terminal device 200 determines the CSI reference resource and / or CSPU, for example, before and after the timing of CSC reception. The method for determining the position of the CSI reference resource and / or CSPU after the timing of CSC reception will be described as a first example. The method for determining the position of the CSI reference resource and / or CSPU before the timing of CSC reception will be described as a second example.

[0126] (First Example) The first example describes the operation in which the terminal device 200 performs CSI measurement after receiving a CSC. Figure 9 shows an example of a method for determining the CSI reference resource and / or CSPU after receiving a CSC. The first cell schedules a CSC (F902) to the terminal device 200 using, for example, DCI (F901). The CSC (F902) may contain information for acquiring the CSI. Alternatively, the terminal device 200 may determine the CSI reference resource after receiving the CSC (F902). Alternatively, the terminal device 200 may consider the CSI reference resource to be configured in the slot that receives the first CSI-RS after receiving the CSC. Alternatively, the terminal device 200 may consider the CSI reference resource to be configured in the slot that receives the first CSI-RS after a predetermined time has elapsed since receiving the CSC and processing the CSC. The predetermined time is an example of the first time. The predetermined time is, for example, a time equal to or greater than the processing time in the MAC (Medium Access Control) layer. For example, terminal device 200 may determine that the slot (F904) that receives the first CSI-RS (F903) transmitted after receiving CSC (F902) is configured as the CSI reference resource. Also, after a certain period of time has passed since terminal device 200 received CSC, If CSI-RS is not received within a certain period, terminal device 200 may interrupt (drop) the CSI report. Also, after a certain period of time has passed since terminal device 200 received CSC, If CSI-RS cannot be received within a certain period of time, the terminal device 200 will... The measurement may be performed using the first CSI-RS that is transmitted later, and a message indicating the completion of the measurement may be sent to the second cell. The results of the CSI measurement using the CSI-RS may also be transmitted according to the schedule of the second cell. (This is a certain period of time.) This may be given by higher-level parameters. This value may vary depending on the SCS. Note that CSI-RS (F903) is an example of a first reference signal. Also, slot (F904) is an example of a first reference signal resource.

[0127] The terminal device 200 will receive a CSI reference resource for a certain period of time. You can expect that a UL resource will be scheduled to send a CSI report later. The terminal device 200 will receive the CSI reference source after a certain period of time. The CSI report may be sent to the first UL resource scheduled later. Also, the terminal device 200 will wait a certain period of time after receiving the CSC. The terminal device 200 may send the CSI report to the first UL resource scheduled later. The CSI report may be sent to the first UL resource scheduled later. This UL resource may be PUSCH or PUCCH. teeth, It may also be the number of slots. Also, the certain period teeth It may also be the number of slots. Also, the certain period teeth, It may also be the case that the certain period This may be given by higher layer parameters. Also, the certain time This may be given by CSC. Also, the certain time This can also be calculated using the Numerology of the second cell.

[0128] The CSC may specify the UL resource to send the CSI report to. The CSC may also specify a PUSCH or PUCCH to send the CSI report to. For example, after receiving the CSC, You may also specify the second PUSCH to be scheduled. For example, CSC may be scheduled after CSC reception. Scheduled up to the 1st Specify the PUSCH, and the terminal device 200 will Some or all of the individual PUSCHs may transmit a CSI report. Also, the terminal device 200 will transmit a CSI report for a certain period of time. Some of the contents included It is not necessary to send a CSI report to each PUSCH. This means that the terminal device 200 does not need to complete the measurements for CSI acquisition. Also, for example, The value of may be included in CSC. Also, The value of may be given by the higher-level parameters. Also, The value of may be one or more values ​​given by the higher-level parameters and selected by the CSC.

[0129] a certain period of time If a UL resource (F907) that carries a CSI report is scheduled for a slot (F906), the terminal device 200 will not include the CSI report in the UL resource for a certain period of time. The CSI report may be included and sent with the first UL resource scheduled later. Also, for a certain period of time If a UL resource that carries a CSI report is scheduled, the terminal device 200 will send a message to that UL resource for a certain period of time. The second cell may also send information informing it to include the CSI report in the first UL resource scheduled later. If a UL resource that carries a CSI report is scheduled, the terminal device 200 may send the CSI report to the UL resource with the CQI field set to OOR (Out-Of-Range). The OOR may be the Lowest CQI.

[0130] a certain period of time If a UL resource (F907) carrying a CSI report is scheduled, terminal device 200 may drop the transmission of the CSI report for a certain period of time. If a UL resource that carries the CSI report is scheduled, the terminal device 200 does not need to send the CSI report.

[0131] a certain period of time If a UL resource (F907) carrying a CSI report is scheduled, the terminal device 200 may send a Scheduling Request (SR) to the second cell, informing the second cell that there is a CSI report available for transmission.

[0132] Furthermore, for example, the time obtained by going back from slot (F906) to time (F908) is an example of a second time. Note that time (F908) corresponds to the time from measuring the reference signal to obtaining the measurement result.

[0133] In the first example, the CSPU may be the period from the symbol following the last symbol that received a CSC to the last symbol of the UL resource that sends a CSI report. Alternatively, in the first example, the CSPU may be the period from the symbol following the last symbol that received a PDCCH containing a DCI scheduling a CSC to the last symbol of the UL resource that sends a CSI report. Furthermore, if no UL resource is scheduled to send a CSI report, the CSPU may be in an occupied state. Also, in the first example, or Calculations related to the time domain, etc., may be performed in accordance with the SCS of the second cell. Also, in the first example, or Calculations related to the time domain, such as those mentioned above, may be performed in accordance with the SCS of the first cell. Also, in the first example, or Calculations related to the time domain, such as those mentioned above, may be performed according to the smaller of the two SCS values ​​between the first cell and the second cell. Also, in the first example, or Calculations related to the time domain, such as those mentioned above, may be performed according to the larger of the two SCS values ​​between the first cell and the second cell.

[0134] As described above, in the first example, the terminal device 200 determines the slot (F904) as the CSI reference resource (F905) in response to the reception of the CSC (F902). Then, it determines the CSI to be reported according to the CSI reference resource (F905). In the first example, the CSI reference resource (F905) may also be the CSI to be reported. That is, the terminal device 200 determines the CSI to be measured in response to the reception of the CSC (F902). Then, the terminal device 200 transmits the CSI to be measured. In this way, the terminal device 200 can report the acquired CSI in LTM. Furthermore, the terminal device 200 can minimize the decrease in throughput by acquiring the CSI before performing a cell switch and reporting it to the cell to which the cell switch is taking place.

[0135] The second example describes the operation of acquiring the CSI before receiving the CSC. Note that the operation in the second example may also be the operation of the terminal device 200 having the first capability.

[0136] Figure 10 shows an example of a measurement performed before receiving the CSC. DCI (F901) schedules, for example, the CSC (F902). The CSI reference resource (F1001) may be updated in the slot (F1002) that receives the CSC (F902). The terminal device 200 performs a certain period of time (F1006). The measurement result using the latest CSI-RS among the results of measuring CSI using the CSI-RS transmitted internally may be included in the CSI report and sent to the second cell. The latest CSI-RS may be the CSI-RS closest to the CSI reference resource (F1001). The slot that received the latest CSI-RS may be the slot that received the CSI-RS closest in time to the CSI reference resource (F1001) among the slots that are not slower than the slot (F1002) in which the CSI reference resource is configured. The slot that received the latest CSI-RS may be the slot that received the CSI-RS closest in time to the CSI reference resource (F1001) among the slots that are not slower than the slot (F1002) that is configured. This may be given by the upper layer parameters. Also, the constant time (F1006) This may be given by CSC. Also, the certain time (F1006) This may be given by a combination of upper layer parameters and CSC. Note that the constant time (F1006) This is an example of a third time period. The timing of receiving the CSC is an example of a first time period, the timing of receiving the CSC is an example of a first time period, and the start time of a certain period is an example of a third time period.

[0137] If the terminal device 200 does not perform a measurement using the CSI-RS transmitted within the specified time (F1006), the terminal device 200 may switch to the operation described in the first example. Also, if the terminal device 200 does not perform a measurement using the CSI-RS transmitted within the specified time (F1006), the terminal device 200 does not have to transmit a CSI report. In other words, if the terminal device 200 has not performed a measurement of the reference signal within the specified time (F1006), it determines the reference signal to be reported using the method described in the first example.

[0138] In the second example, the CSPU may begin occupying the CSPU from the time CSI acquisition is configured in the upper layer parameters. In the second example, the CSPU may begin occupying the CSPU from the time CSI acquisition is configured in the upper layer parameters and RRC configuration or RRC reconfiguration is completed. In the second example, the CSPU may begin occupying the CSPU from the time SP CSI-RS is activated. In addition, the CSPU may begin occupying the CSPU from the time CSI acquisition is triggered. In addition, the CSPU may end occupying the CSPU when the corresponding CSI report is completed. In addition, the CSPU may end occupying the CSPU when the corresponding SP CSI-RS is deactivated. In addition, the CSPU may end occupying the CSPU a certain period of time after receiving the CSC. This certain period of time may be zero or more slots, or zero or more symbols.

[0139] In the second example, the time calculation may be performed according to the SCS of the second cell. Alternatively, the time calculation in the second example may be performed according to the SCS of the first cell. Alternatively, the time calculation in the second example may be performed according to the smaller SCS between the SCS of the first and second cells. Alternatively, the time calculation in the second example may be performed according to the larger SCS between the SCS of the first and second cells.

[0140] In the first and / or second example, the terminal device 200 may transmit the acquired CSI using UL resource F907. In the first and / or second example, the terminal device 200 may transmit the corresponding CSI report using UL resource F907. The UL resource F907 may be configured with an indication bit to indicate whether or not there is a CSI report that can be transmitted from the terminal device 200. In the first example, for a certain period of time If a UL resource F907 carrying a CSI report is scheduled, the terminal device 200 may set the indication bit of the UL resource F907 with information indicating that there are no CSI reports available to send and transmit it. In the first example, for a certain period of time If a UL resource F907 that will carry the CSI report is scheduled later, the terminal device 200 may set information in the indication bit of the UL resource F907 indicating that there is a CSI report available to send, and then multiplex the CSI report to the UL resource F907.

[0141] Furthermore, in the first and / or second example, the terminal device 200 may use the DMRS of PUSCH or PUCCH transmitted in UL resource F907 to indicate whether or not a CSI report is available to be sent from the terminal device 200. The terminal device 200 uses the initial value of the DMRS of PUSCH transmitted in UL resource F907. or the initial value of PUCCH's DMRS The terminal device 200 may use this to indicate whether or not a CSI report can be sent. Initial value of PUSCH's DMRS This is given, for example, by (Equation 3).

[0142] (Formula 3)

[0143] This could also be the number of slots within a single frame in SCSμ. This may be given by a higher-level parameter or by a cell index (cell ID). This value can be either 0 or 1. This can be any value of 0, 1, or 2. The terminal device 200, for example, if there is a CSI report that can be transmitted, The first value may be set to this. The terminal device 200, for example, if there are no CSI reports that can be transmitted, A second value may be set. For example, the first value and the second value are different values. For example, if the first value is 0, the second value is 1. For example, if the first value is 1, the second value is 0. If the first value is set in DMRS, terminal device 200 may send a CSI report using UL resource F907. If the second value is set in DMRS, terminal device 200 does not have to send a CSI report using UL resource F907.

[0144] Furthermore, in each embodiment, cell switching, cell switch, and LTM cell switch may have the same meaning. Performing CSI acquisition may also mean performing measurements for CSI acquisition. CSI measurement may also mean CSI acquisition. Reporting may also mean sending a report.

[0145] As described above, in the second example, the terminal device 200 determines the slot (F1002) as the CSI reference resource (F1002) in response to the reception of CSC (F902). Then, it determines the CSI to be reported according to the CSI reference resource (F1002). In the second example, for example, one of the CSI-RSs measured within a certain period (F1006) preceding the reception timing of CSC (F902) or the CSI reference resource (F1002) is determined as the reference signal to be reported. Then, the terminal device 200 transmits the CSI to be measured. In this way, the terminal device 200 can report the acquired CSI in LTM. Furthermore, the terminal device 200 can minimize the decrease in throughput by acquiring the CSI before performing a cell switch and reporting it to the cell to which the cell switch is taking place.

[0146] In Embodiment 1, CSC is an example of a first signal that instructs cell switching. Furthermore, the process of determining the reference signal to be reported from one or more reference signals in response to the reception of CSC is an example of a first process. Also, the CSI report is an example of a second signal containing measurement information of the reference signal. CSC may also be described as a cell switching command, which is a MAC layer signal that instructs switching from the first cell to the second cell. Hardware configuration of each device in each embodiment

[0147] Based on Figures 11 and 12, the hardware configuration of each device in the wireless communication system of each embodiment will be described.

[0148] Figure 11 shows an example of the hardware configuration of the base station device 100 in this embodiment. As shown in Figure 11, the base station device 100 has, as hardware components, an RF (Radio Frequency) circuit 320 equipped with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, a memory 350, and a network IF (Interface) 360. The CPU 330 is connected via a bus to enable input and output of various signals and data signals. The memory 350 includes at least one of RAM (Random Access Memory), such as SDRAM (Synchronous Dynamic Random Access Memory), ROM (Read Only Memory), and flash memory, and stores programs, control information, and data signals.

[0149] The correspondence between the functional configuration of the base station device 100 shown in Figure 2 and the hardware configuration of the base station device 100 shown in Figure 11 will be explained. The transmitting unit 111 and the receiving unit 112 (or communication unit 140) are realized by, for example, an RF circuit 320, or an antenna 310 and an RF circuit 320. The control unit 120 is realized by, for example, a CPU 330, a DSP 340, a memory 350, and a digital electronic circuit (not shown). Examples of digital electronic circuits include ASICs (Application Specific Integrated Circuits), FPGAs (Field Programmable Gate Arrays), and LSIs (Large Scale Integrations).

[0150] Furthermore, the base station device 100 can generate multiple data signals transmitted in multiple subbands, and the filters that generate these signals may be configured independently for each subband.

[0151] Figure 12 shows an example of the hardware configuration of the terminal device 200 in this embodiment. As shown in Figure 12, the terminal device 200 has, as hardware components, an RF circuit 420 equipped with an antenna 410, a CPU 430, and a memory 440. Furthermore, the terminal device 200 may have a display device such as an LCD (Liquid Crystal Display) connected to the CPU 430. The memory 440 includes at least one of RAM such as SDRAM, ROM, and flash memory, and stores programs, control information, and data signals.

[0152] The correspondence between the functional configuration of the terminal device 200 shown in Figure 3 and the hardware configuration of the terminal device 200 shown in Figure 12 will be explained. The transmitting unit 211 and the receiving unit 212 (or communication unit 210) are implemented, for example, by an RF circuit 420, or by an antenna 410 and an RF circuit 420. The control unit 220 is implemented, for example, by a CPU 430, a DSP 440, a memory 450, and a digital electronic circuit (not shown). Examples of digital electronic circuits include ASICs, FPGAs, and LSIs.

[0153] Although each embodiment describes an example of a base station device, terminal, and repeater, the disclosed technology is not limited to these examples and can be applied to various devices such as electronic equipment mounted on automobiles, trains, airplanes, satellites, electronic equipment transported by drones, robots, AV equipment, home appliances, office equipment, vending machines, and other everyday devices.

[0154] Furthermore, although each embodiment was explained using fifth-generation mobile communication as an example, the disclosed technology is not limited to these. Each embodiment may also apply the disclosed technology to mobile communication of a different generation, such as sixth-generation or seventh-generation.

[0155] 1 Wireless Communication System 100A Base Station Equipment 100B Base Station Equipment C10 Cell C11 Cell 110 Wireless Communication Unit 111 Transmitter Unit 112 Receiver Unit 120 Control Unit 130 Memory Unit 140 Communication Unit 200 Terminal 210 Communication Unit 211 Transmitter Unit 212 Receiver Unit 220 Control Unit 310 Antenna 320 RF Circuit 330 CPU 340 DSP 350 Memory 360 Network IF 410 Antenna 420 RF Circuit 430 CPU 440 DSP 450 Memory

Claims

1. A terminal device comprising: a receiving unit that receives a first signal instructing cell switching; a control unit that performs a first process to determine a reference signal to be reported from one or more reference signals in response to the reception of the first signal; and a transmitting unit that transmits a second signal containing measurement information of the reference signal.

2. The terminal device according to claim 1, wherein the first process includes determining a first reference signal resource that corresponds to the first reference signal set after a first time has elapsed from a first timing of receiving the first signal, and determining the first reference signal received by the first reference signal resource as the reference signal.

3. The terminal device according to claim 2, wherein the first time is equal to or greater than the processing time in the MAC (Medium Access Control) layer.

4. The terminal device according to claim 2, wherein the first signal is a cell switching command, which is a MAC layer signal instructing a switch from a first cell to a second cell, the receiving unit receives the first signal via the first cell, and the transmitting unit transmits the second signal via the second cell.

5. The terminal device according to claim 4, wherein the first cell corresponds to a first subcarrier spacing (SCS), the second cell corresponds to a second SCS, and the control unit counts the first time in accordance with either the first SCS or the second SCS.

6. The terminal device according to claim 1, wherein the first process determines a first reference signal resource corresponding to the first reference signal, which is set to a position earlier than a second time from a second timing, which is the transmission timing of the second signal, and controls the first reference signal to be measured at the first reference signal resource.

7. The terminal device according to claim 6, wherein the second time corresponds to the time from measuring the first reference signal to obtaining the measurement result.

8. The terminal device according to claim 6, wherein the first signal includes information indicating the second timing.

9. The terminal device according to claim 1, wherein the first process includes a process to start a CSI processing unit from a first timing when the first signal is received, or when a control signal for scheduling the first signal is received, and the CSI processing unit terminates when the second signal is transmitted.

10. The terminal device according to claim 1, wherein the first process includes determining the second reference signal as the reference signal if a second reference signal is received during a third time period from a third timing prior to a first timing in which the first signal is received to the first timing.

11. The terminal device according to claim 10, wherein the first process includes, if the second reference signal is not measured during a third time period from a third timing prior to the first timing of reception of the first signal to the first timing, determining a first reference signal resource corresponding to the first reference signal set after a first time period has elapsed from the first timing of reception of the first signal, and determining the first reference signal received by the first reference signal resource as the reference signal.

12. A base station device comprising: a transmitting unit that transmits one or more reference signals; and a receiving unit that receives a second signal containing measurement information of a reference signal determined to be reported from one or more reference signals, upon receiving a first signal instructing cell switching.

13. A base station device comprising: a transmitting unit that transmits a first signal to a terminal device that instructs cell switching; and a control unit that, by transmitting the first signal, causes the terminal device to perform a first process for determining a reference signal to be reported from one or more reference signals.

14. A communication system comprising: a first base station device that transmits a first signal instructing cell switching; a terminal device that, in response to receiving the first signal, performs a first process for determining a reference signal to be reported from one or more reference signals and transmits a second signal containing measurement information of the reference signal; and a second base station device that receives the second signal.

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