Terminals, base stations, communication methods, and systems

Abstract

A terminal has: a reception part that refers to one or a plurality of first symbols and performs measurement of a layer 1 and a layer 3; and a control unit that assumes that data scheduling is not to be performed on the first symbol, and on a second symbol consecutively before the first symbol and a third symbol consecutively after the first symbol, the number of symbols of the second symbol being one or more, and the number of symbols of the third symbol being one or more.

Description

Technical Field

[0001] The present invention relates to a terminal, a base station, and a communication method in a wireless communication system.

Background Art

[0002] In NR (New Radio), which is a successor system to LTE (Long Term Evolution) (also referred to as "5G"), technologies that satisfy requirements such as a large-capacity system, high data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and power saving are being studied (for example, Non-Patent Document 1).

[0003] In NR Release 17, using a higher frequency band than conventional releases (for example, Non-Patent Document 2) is being studied. For example, applicable numerology including subcarrier spacing, channel bandwidth, etc. in the frequency band from 52.6 GHz to 71 GHz, the design of the physical layer, and obstacles assumed in actual wireless communication are being studied.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When performing measurements in a frequency band that uses a newly operated higher frequency than before, for example, due to the beam switching time or the short symbol length due to a larger subcarrier spacing, the symbols to be excluded from the target of data scheduling may not be sufficient if they are the same symbols as the measurement target.

[0006] The present invention has been made in view of the above points, and enables scheduling adapted to the frequency band in a wireless communication system. [Means for solving the problem]

[0007] According to the disclosed technology, a receiving unit performs measurements in Layer 1 and Layer 3 by referencing one or more first symbols, The system includes a control unit that assumes that no data scheduling is performed on the first symbol, the second symbol that precedes the first symbol, and the third symbol that follows the first symbol. The number of symbols for the second symbol and the number of symbols for the third symbol are determined based on the subcarrier interval, in a terminal, The control unit, Intraband In the case of carrier aggregation, a terminal is provided that assumes no data scheduling is performed for the first symbol, the second symbol, and the third symbol in all serving cells. [Effects of the Invention]

[0008] According to the disclosed technology, a wireless communication system can perform scheduling that adapts to the frequency band. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows an example configuration of a wireless communication system according to an embodiment of the present invention. [Figure 2] This figure shows an example of a frequency range in an embodiment of the present invention. [Figure 3] This is an example of scheduling in an embodiment of the present invention (1). [Figure 4] This is an example (2) of scheduling in an embodiment of the present invention. [Figure 5]This is an example (3) of scheduling in an embodiment of the present invention. [Figure 6] This figure shows an example of the functional configuration of the base station 10 in an embodiment of the present invention. [Figure 7] This figure shows an example of the functional configuration of terminal 20 in an embodiment of the present invention. [Figure 8] This figure shows an example of the hardware configuration of a base station 10 or terminal 20 in an embodiment of the present invention. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to those described below.

[0011] In the operation of the wireless communication system according to the embodiments of the present invention, existing technologies may be used as appropriate. However, such existing technologies include, for example, existing LTE, but are not limited to existing LTE. Furthermore, the term "LTE" as used herein has a broad meaning that includes LTE-Advanced and LTE-Advanced and later methods (e.g., NR), unless otherwise specified.

[0012] Furthermore, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel), which are used in existing LTE systems, will be used. This is for convenience of description, and similar signals, functions, etc., may be called by other names. Also, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if a signal is used in NR, it is not necessarily explicitly stated as "NR-".

[0013] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or any other method (for example, a Flexible Duplex).

[0014] Furthermore, in the embodiments of the present invention, "configuring" wireless parameters may mean that predetermined values ​​are pre-configured, or that wireless parameters notified from the base station 10 or terminal 20 are configured.

[0015] Figure 1 shows an example of the configuration of a wireless communication system in an embodiment of the present invention. The wireless communication system in the embodiment of the present invention includes a base station 10 and a terminal 20, as shown in Figure 1. Figure 1 shows one base station 10 and one terminal 20, but this is an example, and there may be multiple base stations 10 and terminals 20.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits the synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, by NR-PBCH and is also called notification information. The synchronization signal and system information may be called SSB (SS / PBCH block). As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 in the DL (Downlink) and receives control signals or data from the terminal 20 in the UL (Uplink). Both the base station 10 and the terminal 20 are capable of performing beamforming for signal transmission and reception. Also, both the base station 10 and the terminal 20 are capable of applying communication by MIMO (Multiple Input Multiple Output) to the DL or UL. Also, both the base station 10 and the terminal 20 may perform communication via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) by CA (Carrier Aggregation). Further, the terminal 20 may perform communication via the primary cell of the base station 10 and the primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 by DC (Dual Connectivity).

[0017] The terminal 20 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, a communication module for M2M (Machine-to-Machine), etc. As shown in FIG. 1, the terminal 20 receives a control signal or data from the base station 10 in the DL and transmits a control signal or data to the base station 10 in the UL, thereby using various communication services provided by the wireless communication system. Further, the terminal 20 receives various reference signals transmitted from the base station 10 and executes measurement of the propagation path quality based on the reception result of the reference signal.

[0018] FIG. 2 is a diagram showing an example of a frequency range in an embodiment of the present invention. In the NR specifications of 3GPP Release 15 and Release 16, for example, it is being considered to operate in a frequency band of 52.6 GHz or higher. As shown in FIG. 2, the currently defined FR (Frequency range) 1 is a frequency band from 410 MHz to 7.125 GHz, the SCS (Sub carrier spacing) is 15, 30 or 60 kHz, and the bandwidth is from 5 MHz to 100 MHz. FR2 is a frequency band from 24.25 GHz to 52.6 GHz, the SCS uses 60, 120 or 240 kHz, and the bandwidth is from 50 MHz to 400 MHz. For example, the newly operated frequency band may be assumed to be from 52.6 GHz to 114.25 GHz.

[0019] As described above, since the newly operated frequency band has a much higher carrier frequency than before, for example, the following problems 1)-3) are assumed.

[0020] 1) Large phase noise Due to this problem, for example, it is required to use a larger SCS or a single carrier waveform.

[0021] 2) Large propagation loss Due to this problem, for example, a narrower beam and a larger number of beams are required.

[0022] 3) High sensitivity in PAPR (Peak to Average Power Ratio) and nonlinearity of PA (Power amplifier) This problem necessitates, for example, a larger SCS (i.e., a smaller number of FFT points), a mechanism to reduce PAPR, and a single-carrier waveform.

[0023] When considering the problems described above, the waveforms in the newly operated frequency band are expected to be, for example, CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing) / DFT-S-OFDM (Discrete Fourier Transform Spread OFDM) which apply a larger SCS.

[0024] On the other hand, as shown in Table 1 illustrating the relationship between SCS and symbol length, if 14 symbols are maintained as the slot configuration, a larger SCS will result in shorter symbol / CP periods and slot periods.

[0025] [Table 1]

[0026] As shown in Table 1, when the SCS is 15 kHz, the symbol length is 66.6 microseconds. When the SCS is 30 kHz, the symbol length is 33.3 microseconds. When the SCS is 60 kHz, the symbol length is 16.65 microseconds. When the SCS is 120 kHz, the symbol length is 8.325 microseconds. When the SCS is 240 kHz, the symbol length is 4.1625 microseconds. When the SCS is 480 kHz, the symbol length is 2.08125 microseconds. When the SCS is 960 kHz, the symbol length is 1.040625 microseconds.

[0027] Furthermore, Radio Resource Management (RRM) is a terminal operation that should take the above-mentioned problems into consideration. RRM performs Radio Link Monitoring (RLM) in the primary cell or primary-secondary cell group. RRM also performs link recovery in the primary cell or primary-secondary cell group. Link recovery includes operations related to Beam Failure Detection (BFD) and Candidate Beam Detection (CBD). In addition, RRM controls Layer 3 measurement and Layer 1-RSRP measurement in the serving cell. Note that "Layer 3 measurement" may refer to NR intra-frequency measurement and / or NR inter-frequency measurement.

[0028] Furthermore, considering the issues mentioned above, it is necessary to determine the areas where scheduling is possible. Generally, to monitor SSB for RRM, all DL receptions and UL transmissions on the same symbol as the monitored SSB are not expected on the terminal side. In addition, in L3 measurements, in addition to the same symbol as the monitored SSB, the preceding and succeeding symbols of the monitored SSB are excluded from scheduling. For example, this exclusion is carried out considering the timing gap between cells related to propagation delay and synchronization gap.

[0029] In newly operated frequency bands, it is conceivable that excluding symbols from data scheduling may not be sufficient if they are identical to the symbols being monitored. Furthermore, when excluding symbols other than those identical to those being monitored, the number of symbols to be excluded is unclear. For example, it is unclear whether excluding only one symbol before or after the target symbol is sufficient. Additionally, factors such as beam switching time and the shortened OFDM symbol length due to larger SCS (Simulation Scale) must be considered.

[0030] Therefore, as a scheduling constraint, it may be stipulated that during RLM, BFD, CBD, or L1-RSRP measurements, each of the multiple symbols before and after the SSB or reference symbol should not be used for data scheduling. This prevents, for example, symbols that are unavailable due to beam switching time from being used for scheduling.

[0031] Figure 3 shows an example of scheduling in an embodiment of the present invention (1). As shown in Figure 3, the preceding and succeeding X symbols of each measured SSB or reference symbol do not necessarily have to be used for UL transmission and DL reception, i.e., data scheduling. The value X may be set based on FR, for example. For example, different values ​​of X may be set for the frequency band above 52.6 GHz, FR1, and FR2, respectively. The reference symbol may be a symbol on which an SSB or various reference signals are placed.

[0032] Hereinafter, "reference symbol" may refer to either an SSB or a reference signal. An SSB or reference signal may be placed on one or more symbols, and may be placed on consecutive symbols or discontinuous symbols. If an SSB or reference signal is placed on discontinuous symbols, the outermost symbol in the time domain may define the period before and after the reference symbol. Note that the reference symbol itself does not have to be used for data scheduling. Furthermore, the number of symbols not used for data scheduling before and after a reference symbol does not have to be the same. That is, the number of symbols not used for data scheduling before and after a reference symbol may be set independently.

[0033] Furthermore, for example, the value X may be determined based on the SCS used for the reference signal being measured (e.g., 480kHz, 960kHz, or a higher frequency). Alternatively, the value X may be determined based on the SCS used for the data. Furthermore, the value X may be determined based on both the SCS used for the reference signal being measured and the SCS used for the data. For example, if the SCS of the reference signal and the SCS of the data are different, the value X may be determined based on both SCSs.

[0034] Furthermore, value X may be one of the RRC settings. For example, the RRC setting and value X may be determined depending on the frequency band, SCS, and / or the difference in SCS applied to the reference signal and the data. Also, value X may be one of the MAC-CE (Medium Access Control - Control Element) settings. For example, the MAC-CE setting and value X may be determined depending on the frequency band and / or SCS. Also, value X may be determined by notification of DCI (Downlink Control Information).

[0035] Furthermore, the value X or the range of the value X may be determined based on UE capability signaling or SCS.

[0036] Multiple different values ​​X may be set for different purposes. For example, a value X may be set to ensure beam switching time, or a value X may be set to ensure transmit / receive switching time. For example, X = Y + Z, where Y is the value for ensuring beam switching time and Z is the value for ensuring transmit / receive switching time. Y and Z may be set based on different conditions. For example, Y may be set based on SCS, while Z may be set based on SCS and data direction (i.e., UL or DL).

[0037] For example, a predetermined value (e.g., 1, 2, etc.) may be set to value X for a frequency band or FRx (FR1, FR2, FR3, etc.) exceeding a certain frequency, and further conditions may be added to perform this setting when different SCSs are used for the data and the measured reference signal.

[0038] Furthermore, for example, a predetermined value (e.g., 1, 2, etc.) may be set to value X when a predetermined SCS (e.g., 240kHz, 480kHz, 960kHz or higher SCS) is used, and additional conditions may be added to perform this setting when different SCSs are used for the data and the reference signal being measured.

[0039] Furthermore, for example, a predetermined value (e.g., 1, 2, etc.) may be set to value X by RRC signaling. This predetermined value may be determined based on frequency-related information (e.g., carrier frequency, FR), based on SCS, or based on other conditions.

[0040] Furthermore, for example, a predetermined value (e.g., 1, 2, etc.) may be set to value X by MAC signaling. This predetermined value may be determined based on frequency-related information (e.g., carrier frequency, FR), based on SCS, or based on other conditions.

[0041] Furthermore, for example, candidate sets of values ​​for value X may be identified or set by RRC signaling. A predetermined value may be notified by DCI from such candidate sets, a predetermined value may be set by MAC-CE from such candidate sets, or a predetermined value may be set by RRC signaling from such candidate sets.

[0042] The range or candidate values ​​for value X may be determined based on UE capability or based on SCS. For example, a higher SCS may be associated with a larger value X.

[0043] The scheduling method for RLM, BFD, CBD, or L1-RSRP measurements described using Figure 3 above is referred to below as Proposal 1.

[0044] As a scheduling limitation, it may be stipulated that during L3 measurements, each of the multiple symbols before and after the SSB or reference symbol should not be used for data scheduling. This prevents, for example, symbols that are unavailable due to beam switching time from being used for scheduling.

[0045] Figure 4 shows an example of scheduling in an embodiment of the present invention (2). As shown in Figure 4, the X+1 symbols before and after each SSB or reference symbol measured in L3 do not have to be used for UL transmission and DL reception, i.e., data scheduling. The value X may be determined or set in the same way as described above using Figure 3. That is, there may be more symbols that are not used for data scheduling before and after the measured SSB or reference symbol during L3 measurement than during measurement in Proposal 1. Note that the reference symbol itself does not have to be used for data scheduling. Also, the number of symbols that are not used for data scheduling before and after a reference symbol do not have to be the same. That is, the number of symbols that are not used for data scheduling before and after a reference symbol may be set independently.

[0046] For example, the value X may be determined or set by RRC signaling, set by MAC-CE, or notified by DCI. Furthermore, the value X or a range of value X may be determined based on UE capability signaling.

[0047] Multiple different values ​​X may be set for different purposes. For example, a value X may be set to ensure beam switching time, or a value X may be set to ensure transmit / receive switching time. For example, X = Y + Z, where Y is the value for ensuring beam switching time and Z is the value for ensuring transmit / receive switching time.

[0048] Figure 5 shows an example of scheduling (3) in an embodiment of the present invention. As shown in Figure 5, the preceding X+W symbols and following X+W symbols of each SSB or reference symbol measured in L3 do not have to be used for UL transmission and DL reception, i.e., data scheduling. This makes it possible to avoid using symbols that cannot be used due to beam switching time and timing differences between cells for scheduling. Note that the reference symbol itself does not have to be used for data scheduling. Also, the number of symbols that are not used for data scheduling before and after a reference symbol do not have to be the same. That is, the number of symbols that are not used for data scheduling before and after a reference symbol can be set independently.

[0049] For example, values ​​X and W may be determined or set by RRC signaling, set by MAC-CE, or notified by DCI. Furthermore, values ​​X, W, the range of value X, and the range of value W may be determined based on UE capability signaling.

[0050] Multiple different values ​​X and multiple different values ​​W may be set for different purposes. For example, a value X may be set to ensure beam switching time, or a value X may be set to ensure transmit / receive switching time. For example, X = Y + Z, where Y is a value for ensuring beam switching time and Z is a value for ensuring transmit / receive switching time.

[0051] The value W may be determined based on any or a combination of the following: the timing difference between the serving cell and the other cell where the reference signal to be monitored is located; the SCS applied to the serving cell; the SCS applied to the other cell where the reference signal to be monitored is located; and the operating FR.

[0052] The values ​​X and W may be determined based on different methods. For example, the value X may be determined based on UE capability, and the value W may be predetermined.

[0053] The scheduling method during L3 measurement described using Figures 4 and 5 above is referred to below as Proposal 2.

[0054] The scheduling methods according to Proposal 1 and Proposal 2 described above may be set, enabled, or deactivated based on RRC signaling. For example, the scheduling methods according to Proposal 1 and Proposal 2 may be enabled or deactivated based on predetermined RRC signaling.

[0055] Proposal 1 above may be applied to scheduling during L3 measurement. Proposal 2 above may be applied to scheduling during RLM, BFD, CBD, or L1-RSRP measurement.

[0056] In the case of carrier aggregation, Proposal 1 and Proposal 2 above may be applied independently to each CC (Component Carrier). That is, different scheduling methods may be applied to different CCs.

[0057] Furthermore, in the case of carrier aggregation, the scheduling methods according to Proposal 1 and Proposal 2 above, applied to a certain CC, may also be applied to all one or more serving cells. Such a certain CC may be a primary cell or primary-secondary cell group cell in FR2, a CC to which the largest SCS is applied, or a CC to which the largest value X or value X+W described above is applied.

[0058] The scheduling method described above for carrier aggregation may be applied to intraband carrier aggregation and interband carrier aggregation, or it may be applied only to intraband carrier aggregation.

[0059] As described above, when the base station 10 and terminal 20 are measuring SSB or various reference signals, they can flexibly set symbols that are not used for data scheduling according to the frequency band or SCS, etc.

[0060] In other words, in a wireless communication system, scheduling can be performed that is adapted to the frequency band.

[0061] (Device configuration) Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above. The base station 10 and terminal 20 include functions to implement the embodiments described above. However, the base station 10 and terminal 20 may each have only some of the functions in the embodiments.

[0062] <Base station 10> Figure 6 shows an example of the functional configuration of a base station 10 in an embodiment of the present invention. As shown in Figure 6, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Figure 6 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention.

[0063] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The transmitting unit 110 also transmits inter-network node messages to other network nodes. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining information from the received signals, for example, higher layer information. The transmitting unit 110 also has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, etc. to the terminal 20. The receiving unit 120 also receives inter-network node messages from other network nodes.

[0064] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20. The content of the setting information includes, for example, information related to measurement settings.

[0065] As described in the embodiment, the control unit 140 performs control related to the measurement settings. The control unit 140 also performs scheduling. The signal transmission function of the control unit 140 may be included in the transmission unit 110, and the signal reception function of the control unit 140 may be included in the reception unit 120.

[0066] <Terminal 20> Figure 7 shows an example of the functional configuration of terminal 20 in an embodiment of the present invention. As shown in Figure 7, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Figure 7 is merely an example. Any functional classification and functional unit names are acceptable as long as they can perform the operations according to the embodiment of the present invention.

[0067] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and acquires signals from higher layers from the received physical layer signals. The receiving unit 220 also has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, etc. transmitted from the base station 10. For example, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20 as D2D communication, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0068] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores pre-configured setting information. The content of the setting information includes, for example, information related to measurement settings.

[0069] The control unit 240 performs control related to the measurement settings, as described in the embodiment. The signal transmission function in the control unit 240 may be included in the transmission unit 210, and the signal reception function in the control unit 240 may be included in the reception unit 220.

[0070] (Hardware configuration) The block diagrams (Figures 6 and 7) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the one or more devices with software.

[0071] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0072] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 8 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0073] In the following explanation, the term "device" can be read as "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0074] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0075] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0076] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes a computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 6 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 7 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0077] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0078] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0079] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0080] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0081] Furthermore, each device, such as the processor 1001 and the storage device 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0082] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0083] (Summary of the embodiments) As described above, according to an embodiment of the present invention, a terminal is provided which includes a receiving unit that performs measurements in Layer 1 and Layer 3 by referring to one or more first symbols, and a control unit that assumes that no data scheduling is performed on the first symbol, a second symbol that precedes the first symbol, and a third symbol that follows the first symbol, wherein the number of symbols of the second symbol is one or more and the number of symbols of the third symbol is one or more.

[0084] With the above configuration, when the base station 10 and terminal 20 are measuring SSB or various reference signals, they can flexibly set symbols that are not used for data scheduling according to the frequency band or SCS, etc. In other words, the wireless communication system can perform scheduling that is adapted to the frequency band.

[0085] The number of symbols for the second symbol and the number of symbols for the third symbol may be determined based on the frequency band or subcarrier interval. With this configuration, when the terminal 20 is measuring SSB or various reference signals, it can flexibly set which symbols are not used for data scheduling according to the frequency band or SCS, etc.

[0086] The number of symbols for the second symbol and the number of symbols for the third symbol may be determined based on the beam switching time and the transmit / receive switching time. This configuration allows the terminal 20 to ensure sufficient time for the transition between measurement and data reception.

[0087] The number of symbols for the second symbol and the third symbol may be larger when the measurement is performed at Layer 3 than when the previous measurement is performed at Layer 1. With this configuration, terminal 20 can adjust the time required for the transition between measurement and data reception according to the measurement content.

[0088] Furthermore, according to an embodiment of the present invention, a base station is provided which includes a transmitting unit that transmits one or more first symbols that are referenced during measurements in Layer 1 and Layer 3, and a control unit that does not schedule data for the first symbol, a second symbol that precedes the first symbol, and a third symbol that follows the first symbol, wherein the number of symbols for the second symbol is one or more and the number of symbols for the third symbol is one or more.

[0089] With the above configuration, when the base station 10 and terminal 20 are measuring SSB or various reference signals, they can flexibly set symbols that are not used for data scheduling according to the frequency band or SCS, etc. In other words, the wireless communication system can perform scheduling that is adapted to the frequency band.

[0090] Furthermore, according to an embodiment of the present invention, a communication method is provided in which a terminal performs a receiving procedure that refers to one or more first symbols to perform measurements in Layer 1 and Layer 3, and a control procedure that assumes that no data scheduling is performed on the first symbol, a second symbol that precedes the first symbol, and a third symbol that follows the first symbol, wherein the number of symbols of the second symbol is one or more and the number of symbols of the third symbol is one or more.

[0091] With the above configuration, when the base station 10 and terminal 20 are measuring SSB or various reference signals, they can flexibly set symbols that are not used for data scheduling according to the frequency band or SCS, etc. In other words, the wireless communication system can perform scheduling that is adapted to the frequency band.

[0092] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0093] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0094] Each aspect / embodiment described in this disclosure may be applied to at least one of the following systems: LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, as well as next-generation systems extended based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0095] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0096] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0097] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0098] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0099] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0100] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0101] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0102] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0103] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0104] The terms “system” and “network” as used in this disclosure are interchangeable.

[0105] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0106] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0107] In this disclosure, terms such as "base station (BS)", "wireless base station", "base station equipment", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0108] A base station can accommodate one or more (e.g., three) cells. If a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0109] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0110] A mobile station may also be referred to by those skilled in the art 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 several other appropriate terms.

[0111] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (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 be a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0112] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0113] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0114] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0115] The terms “connected,” “coupled,” or any variation thereof, mean 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” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0116] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0117] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0118] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0119] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0120] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0121] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist 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.

[0122] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0123] A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a time unit based on neurologic.

[0124] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots 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 (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0125] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0126] For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0127] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal 20 to allocate wireless resources (such as the frequency bandwidth and transmission power available to each terminal 20) in TTI units. However, the definition of TTI is not limited to this.

[0128] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0129] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0130] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0131] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0132] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0133] Furthermore, the time domain of the RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0134] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0135] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0136] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology system in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. A Bandwidth Part (PRB) may be defined and numbered within a given BWP.

[0137] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be configured within a single carrier for a UE.

[0138] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0139] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless 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, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0140] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0141] In this 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 "combine" may be interpreted similarly to "different."

[0142] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0143] The reference symbols in this disclosure are examples of the first symbol.

[0144] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way. [Explanation of Symbols]

[0145] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 devices 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A receiving unit that performs measurements in Layer 1 and Layer 3 by referring to one or more first symbols, The system includes a control unit that assumes that no data scheduling is performed on the first symbol, the second symbol that precedes the first symbol, and the third symbol that follows the first symbol. The number of symbols for the second symbol and the number of symbols for the third symbol are determined based on the subcarrier interval, in a terminal, The control unit assumes that, in the case of intraband carrier aggregation, data scheduling is not performed for the first symbol, the second symbol, and the third symbol in all serving cells.

2. A transmitting unit that transmits one or more first symbols that are referenced during measurements in Layer 1 and Layer 3, The system includes a first symbol, a second symbol preceding the first symbol, and a third symbol following the first symbol, and a control unit that does not perform data scheduling on these symbols. The number of symbols for the second symbol and the number of symbols for the third symbol are determined based on the subcarrier interval, in a base station, The control unit, in the case of intraband carrier aggregation, does not perform data scheduling for the first symbol, the second symbol, and the third symbol in all serving cells, at the base station.

3. The steps include performing measurements in Layer 1 and Layer 3 by referring to one or more first symbols, The control step includes assuming that no data scheduling is performed on the first symbol, the second symbol that precedes the first symbol, and the third symbol that follows the first symbol. The number of symbols for the second symbol and the number of symbols for the third symbol are determined based on the subcarrier interval, in a communication method performed by a terminal. A communication method in which, in the control step, the terminal assumes that, in the case of intraband carrier aggregation, data scheduling is not performed for the first symbol, the second symbol, and the third symbol in all serving cells.

4. A communication system including terminals and base stations, The aforementioned terminal is A receiving unit that performs measurements in Layer 1 and Layer 3 by referring to one or more first symbols, The system includes a control unit that assumes that no data scheduling is performed on the first symbol, the second symbol that precedes the first symbol, and the third symbol that follows the first symbol. The aforementioned base station is A transmitting unit that transmits the first symbol, The first symbol, the second symbol, and the third symbol have a control unit that does not schedule data, The number of symbols for the second symbol and the number of symbols for the third symbol are determined based on the subcarrier interval, and the control unit of the base station does not perform data scheduling for the first symbol, the second symbol, and the third symbol in all serving cells in the case of intraband carrier aggregation.

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