Terminal, measurement method, and wireless communication system

Abstract

The user equipment has a receiving unit that receives measurement settings from a base station device, the measurement settings including an event that includes a condition for sending a measurement report, a control unit that performs measurement based on the measurement settings, and a transmitting unit that transmits a measurement report to the base station device based on the result of the performed measurement when the condition for sending the measurement report is met, and the control unit changes the measurement method based on the result of the performed measurement.

Description

Technical Field

[0001] The present invention relates to a user device and a base station device 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, as a requirement related to measurement of a user device, a delay allowed from the occurrence of an event to be measured until the transmission of a measurement report is defined (for example, Non-Patent Document 2).

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] In an NR wireless communication system, a user device needs to perform measurements so as to satisfy the required conditions defined in the specifications. On the other hand, unnecessary measurements may occur when the communication environment is far from the conditions for satisfying the events related to the measurements.

[0006] The present invention has been made in view of the above points, and an object thereof is to enable a user device to efficiently perform measurements in a wireless communication system.

Means for Solving the Problems

[0007] According to the disclosed technique, a receiving unit that receives, from a base station, a measurement setting including conditions for transmitting a measurement report, a control unit that executes a measurement based on the measurement setting, and when conditions for transmitting the measurement report are satisfied, a transmitting unit that transmits a measurement report to the base station based on the result of the measurement, wherein the control unit, as a result of comparing the result of a first measurement with the result of a second measurement, is a threshold for determining a change in the measurement method, a notified threshold, and a condition for changing the measurement method, a notified condition, and executes a relaxed measurement based on these. When the difference between the result of the relaxed measurement and the result of the previous relaxed measurement of the relaxed measurement is equal to or greater than the threshold value, the control unit increases the measurement. A terminal is provided.

Advantages of the Invention

[0008] According to the disclosed technique, in a wireless communication system, a user device can efficiently perform measurements.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

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Figure 6

Best Mode for Carrying Out the Invention

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

[0011] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are appropriately used. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, the term "LTE" used in this specification shall have a broad meaning including LTE-Advanced and subsequent systems (e.g., NR) unless otherwise specified.

[0012] In addition, 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), etc. used in existing LTE are used. This is for convenience of description, and signals, functions, etc. similar to these 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 for signals used in NR, the "NR-" is not necessarily specified.

[0013] In addition, in the embodiments of the present invention, the duplex mode may be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or another mode (e.g., Flexible Duplex, etc.).

[0014] In the following description, the method of transmitting a signal using a transmission beam may be digital beamforming that transmits a signal multiplied by a precoding vector (precoded by the precoding vector), or may be analog beamforming that realizes beamforming using a variable phase shifter in an RF (Radio Frequency) circuit. Similarly, the method of receiving a signal using a reception beam may be digital beamforming that multiplies a received signal by a predetermined weight vector, or may be analog beamforming that realizes beamforming using a variable phase shifter in an RF circuit. Hybrid beamforming that combines digital beamforming and analog beamforming may be applied to transmission and / or reception. Also, transmitting a signal using a transmission beam may be transmitting a signal at a specific antenna port. Similarly, receiving a signal using a reception beam may be receiving a signal at a specific antenna port. The antenna port refers to a logical antenna port or a physical antenna port defined in the 3GPP standard. Also, the above precoding or beamforming may be referred to as a precoder or a spatial domain filter, etc.

[0015] Note that the method of forming the transmission beam and the reception beam is not limited to the above method. For example, in the base station device 10 or the user device 20 including a plurality of antennas, a method of changing the angle of each antenna may be used, or a method of combining a method using a precoding vector and a method of changing the angle of the antenna may be used, or different antenna panels may be switched and used, or a method of combining a method of using a plurality of antenna panels together may be used, or other methods may be used. Also, for example, in a high frequency band, a plurality of mutually different transmission beams may be used. Using a plurality of transmission beams is called multi-beam operation, and using one transmission beam is called single-beam operation.

[0016] In addition, in the embodiments of the present invention, when wireless parameters or the like are "configured", it may mean that predetermined values are pre-configured, or that wireless parameters notified from the base station apparatus 10 or the user apparatus 20 are configured.

[0017] FIG. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. As shown in FIG. 1, the wireless communication system according to the embodiment of the present invention includes a base station apparatus 10 and a user apparatus 20. In FIG. 1, one base station apparatus 10 and one user apparatus 20 are shown, but this is an example, and there may be a plurality of each.

[0018] The base station apparatus 10 is a communication apparatus that provides one or more cells and performs wireless communication with the user apparatus 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 symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station apparatus 10 transmits a synchronization signal and system information to the user apparatus 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 referred to as notification information. As shown in FIG. 1, the base station apparatus 10 transmits a control signal or data to the user apparatus 20 in the DL (Downlink), and receives a control signal or data from the user apparatus 20 in the UL (Uplink). Both the base station apparatus 10 and the user apparatus 20 are capable of performing beamforming to transmit and receive signals.

[0019] The user apparatus 20 is a communication apparatus 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), or the like. As shown in FIG. 1, the user apparatus 20 receives a control signal or data from the base station apparatus 10 in the DL, and transmits a control signal or data to the base station apparatus 10 in the UL, thereby using various communication services provided by the wireless communication system.

[0020] The user equipment 20 performs measurements to grasp the communication situation. The user equipment 20 is specified an event as a measurement configuration from the base station equipment 10. When the conditions related to the measurement results set by the event are satisfied, the user equipment 20 transmits a measurement report to the base station equipment 10.

[0021] Here, in order to reduce the power consumption of the user equipment 20, changing the RRM (Radio Resource Management) measurement is being considered. Hereinafter, changing the measurement shall mean relaxing the measurement, adapting the measurement, increasing the measurement, decreasing the measurement, restricting the measurement, etc. For example, the user equipment 20 may decrease the number of RRM measurements of the SS block (SS / PBCH block) or CSI-RS (Channel State Information Reference Signal) in the serving cell and adjacent cells in the time domain. Also, for example, the user equipment 20 may reduce the accuracy of the RRM measurement of the SS block or CSI-RS. Also, for example, the user equipment 20 may decrease the number of cells to be measured or the number of frequencies of adjacent cells to be measured according to conditions. Also, for example, the conditions for relaxing the measurement are the channel situation, the position of the user equipment 20, the moving speed of the user equipment 20, etc.

[0022] Relaxing the measurement is being considered to reduce the power consumption of the user equipment 20, especially in an environment with a low moving speed. Also, in the RRM measurement when multi-beam and multi-cell are related, or when the SS block and SMTC (SSB-based measurement timing configuration) are offset from the period when DRX (Discontinuous Reception) is ON, etc., studies have been conducted to reduce the power consumption of the user equipment 20.

[0023] FIG. 2 is a sequence diagram for explaining an example of measurement in an embodiment of the present invention. As shown in FIG. 2, in the embodiment of the present invention, a measurement report is notified from the user equipment 20 to the base station apparatus 10.

[0024] In step S1, the base station apparatus 10 transmits information related to measurement settings to the user equipment 20. The information related to measurement settings includes events. Subsequently, in step S2, the user equipment 20 executes measurement based on the received information related to measurement settings. Subsequently, in step S3, when the conditions related to the measurement result set by the event are satisfied, the user equipment 20 transmits a measurement report to the base station apparatus 10.

[0025] For example, the event indicates conditions for transmitting a measurement report, such as "when the measurement quality (RSRQ: Reference Signal Received Quality) is less than X dB", "when the measurement quality of cell A is Y dB higher than the measurement quality of cell B", "when the measurement quality of frequency band A is Z dB higher than the measurement quality of frequency band B", etc. The event can trigger the transmission of a measurement report when the condition is satisfied. Also, in order to prevent a ping-pong phenomenon where handovers frequently occur between two cells, there is a hysteresis as a parameter.

[0026] In the NR specification, as a requirement condition for measurement by the user equipment 20, a permitted delay time from when the event actually occurs until the measurement report is transmitted is defined. That is, the user equipment 20 needs to execute measurement so that appropriate measurement results can be obtained at least at the period of the permitted delay time. In order to obtain appropriate measurement results, multiple samples may be required. Therefore, the period at which measurement is executed can be shorter than the period of the permitted delay time. The period at which measurement is executed affects the power consumption in the user equipment 20. In order to obtain appropriate measurement results, multiple measurement samples may be required.

[0027] Regardless of the event setting content, measurement results, terminal capabilities, etc., the user equipment 20 needs to perform measurements to meet the required conditions specified in the specifications. However, for example, even if the measurement results in the user equipment 20 are far from the conditions set for the event and it is unlikely that the environment will change so that the conditions set for the event are met in a short time, it is necessary to perform measurements according to the above-specified required conditions.

[0028] For example, when the user equipment 20 is simultaneously performing measurements on two adjacent cells as handover destination candidates, if the measurement result of cell A is within a predetermined value from the threshold for transmitting a measurement report and the measurement result of cell B is more than a predetermined value away from the threshold for transmitting a measurement report, the possibility that cell B meets the threshold for transmitting a measurement report recently is low. However, since the user equipment 20 measures all cells, it may consume more power than necessary. Therefore, it is conceivable to solve the problem of consuming more power than necessary for measurement and reduce the power consumption of the user equipment 20.

[0029] Figure 3 is a flowchart for explaining an example of measurement in an embodiment of the present invention. In step S11, the user equipment 20 performs a measurement. Subsequently, the user equipment 20 changes the measurement method based on the measurement result (S12). Subsequently, the user equipment 20 performs a measurement with the changed measurement method (S13).

[0030] The change in the measurement method in step S12 may be, for example, a change in the number of cells for measurement, the number of frequency bands for measurement, the number of bands for measurement, the number of spatial reception parameters for measurement, the number of resources for measurement, the number of types of resources for measurement, the number of reference signals for measurement, the number of types of reference signals for measurement, the number of measurement objects for which measurement is performed, or the number of measurement configurations for which measurement is performed. The magnitude of the number to be changed may be a magnitude corresponding to the number of measurement targets or measurement settings. The change in the above numbers may be specified in the specification as a function, or the related requirements may be changed or newly specified.

[0031] For a certain measurement, whether to perform the measurement may be determined according to the relative difference between the result of the measurement and the results of other measurements, or the frequency, period, accuracy, etc. of the measurement may be changed. That is, the user equipment 20 may compare the result of the measurement with the results of other measurements to determine whether to continue the measurement. Other measurements may be, for example, measurements of other cells, measurements of other frequency bands, measurements of other bands, measurements of other beams, measurements using other spatial reception parameters, measurements in other resources, measurements in other types of resources, measurements of other reference signals, other measurement objects, other measurement configurations, or other measurements. The result of the measurement or other measurements may include the difference value between the result of the measurement or other measurements and the threshold for transmitting the measurement report.

[0032] For a certain measurement, whether to perform the measurement may be determined according to the absolute value of the result of the measurement or the absolute value of the results of other measurements, or the frequency, period, accuracy, etc. of the measurement may be changed.

[0033] The measurement result may be a signal strength (e.g., RSRP (Reference Signal Received Power), etc.) or a signal quality (e.g., RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise power Ratio), etc.).

[0034] Also, the measurement result, measurement frequency, measurement period, measurement accuracy, etc. may be defined in any layer. For example, it may be layer 1 or layer 3. Also, the samples corresponding to the measurement result, measurement frequency, measurement period, measurement accuracy, etc. may be a single sample or a filtered result of multiple samples.

[0035] Also, the measurement result may be based on the value of a single measurement result or on the change in the value of the measurement result in the time domain. For example, the measurement result may be determined based on whether the measurement result is increasing, decreasing, or the degree of change in the measurement result.

[0036] For example, the measurement method in step S12 may be changed according to the UE mobility indicating the UE's moving speed, UE type related to the moving speed, UE capabilities, UE category. Also, for example, the measurement method in step S12 may be changed according to the UE type, UE capabilities, UE category, etc. related to measurement or power consumption.

[0037] Also, the measurement method may be changed according to the number of measurements. For example, when the number of measurements is greater than a predetermined number, certain measurements may be stopped or the measurement may be relaxed based on certain conditions. Also, for example, when the number of measurements is less than a predetermined number, certain measurements may be started or the measurement may be adapted based on certain conditions. The number of measurements for which the measurement method is changed and the details of the change in the measurement method may be specified in the specification or notified from the base station. The number of measurements refers to, for example, the number of cells for which measurements are performed, the number of frequency bands for which measurements are performed, the number of bands for which measurements are performed, the number of spatial reception parameters for which measurements are performed, the number of resources for which measurements are performed, the number of types of resources for which measurements are performed, the number of reference signals for which measurements are performed, the number of types of reference signals for which measurements are performed, the number of measurement objects for which measurements are performed, or the number of measurement configurations for which measurements are performed, etc.

[0038] The threshold, conditions, operation form to be changed, degree of change, etc. for changing the measurement method in step S12 may be specified in the specification or notified from the base station apparatus 10. The threshold and conditions for changing the measurement method are the threshold or conditions used for the determination to determine the change in the measurement method.

[0039] The notification may be transmitted from the base station apparatus 10 via notification information or RRC (Radio Resource Control) signaling, or may be transmitted together when the base station apparatus 10 sets the measurement.

[0040] For example, as examples of elements such as the threshold, conditions, operation form to be changed, degree of change, etc. for determining the change in the measurement method in step S12, some or all of the following 1)-4) may be used in combination.

[0041] 1) Threshold for changing the measurement method 1a) The difference value between the threshold at which the transmission of the measurement report is triggered and the measurement result is X dB or less. 1b) The difference value from the previous measurement result is Y dB or more. 1c) The difference value between the difference value between the threshold value at which the transmission of the report of Measurement A is triggered and the measurement result, and the difference value between the threshold value at which the transmission of the report of Measurement B is triggered and the measurement result is Z dB or more.

[0042] 2) Conditions for changing the measurement method 2a) Has the measurement result this time increased from the previous measurement result? 2b) Has the measurement result this time decreased from the previous measurement result?

[0043] 3) Operation mode for changing the measurement method 3a) Stop the measurement. For example, the measurement may be stopped for a predetermined time, or may be stopped until an instruction is received from the base station device 10. 3b) Start the measurement. 3c) Relax or tighten the measurement frequency or accuracy.

[0044] 4) Degree of changing the measurement method Halve the measurement frequency.

[0045] Hereinafter, an example of changing the measurement method in step S12 will be described.

[0046] Suppose that the user equipment 20 is simultaneously performing measurements on two adjacent cells, namely Cell A and Cell B, as handover destination candidates. Assume that the difference value between the measurement result of Cell A and the threshold value at which the transmission of the measurement report is triggered is X dB or less, and the measurement result this time has increased from the previous measurement result. On the other hand, assume that the difference value between the measurement result of Cell B and the threshold value at which the transmission of the measurement report is triggered exceeds X dB, and the measurement result this time has decreased from the previous measurement result.

[0047] When the measurement results of cell A and the measurement results of cell B are as described above, as a change in the measurement method in step S12, the user equipment 20 stops measuring cell B. Thereafter, when the difference value between the measurement result of cell A and the threshold value that triggers the transmission of the measurement report exceeds X dB, as a change in the measurement method in step S12, the user equipment 20 starts measuring cell B. Also, the value of X in the above example may be defined or notified as a different value as another parameter.

[0048] According to the above-described embodiment, the user equipment 20 can change the measurement method so as to omit unnecessary measurements based on the measurement results.

[0049] That is, in a wireless communication system, the user equipment can perform measurements efficiently.

[0050] (Device Configuration) Next, a functional configuration example of the base station device 10 and the user equipment 20 that execute the processes and operations described so far will be described. The base station device 10 and the user equipment 20 include functions for implementing the above-described embodiment. However, the base station device 10 and the user equipment 20 may each be provided with only some of the functions in the embodiment.

[0051] <Base Station Device 10> FIG. 4 is a diagram showing an example of the functional configuration of the base station device 10. As shown in FIG. 4, the base station device 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 4 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and the names of the functional units may be anything.

[0052] The transmitting unit 110 includes the function of generating a signal to be transmitted to the user device 20 side and wirelessly transmitting the signal. The receiving unit 120 includes the function of receiving various signals transmitted from the user device 20 and obtaining information of a higher layer, for example, from the received signals. Further, the transmitting unit 110 has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, etc. to the user device 20.

[0053] The setting unit 130 stores setting information set in advance and various setting information to be transmitted to the user device 20 in the storage device and reads it out from the storage device as necessary. The content of the setting information is, for example, information related to the measurement of the user device 20.

[0054] As described in the embodiment, the control unit 140 performs a process of generating a measurement setting of the user device 20. Further, the control unit 140 performs communication control based on the measurement report obtained from the user device 20. The functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

[0055] <User device 20> FIG. 5 is a diagram showing an example of the functional configuration of the user device 20. As shown in FIG. 5, the user device 20 includes a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 5 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional classification and the names of the functional units may be any.

[0056] The transmitting unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires signals of a higher layer from the received physical layer signals. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, etc. transmitted from the base station apparatus 10. Also, 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 another user apparatus 20 as D2D communication, and the receiving unit 120 receives PSCCH, PSSCH, PSDCH, or PSBCH, etc. from another user apparatus 20.

[0057] The setting unit 230 stores various setting information received from the base station apparatus 10 or the user apparatus 20 by the receiving unit 220 in the storage device and reads it out from the storage device as necessary. Also, the setting unit 230 stores preset setting information. The content of the setting information is, for example, information related to the measurement of the user apparatus 20.

[0058] The control unit 240 executes measurements based on the measurement settings acquired from the base station apparatus 10 as described in the embodiments. Also, the control unit 240 reports the measurement results to the base station apparatus 10. A functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0059] (Hardware Configuration) The block diagrams (Figs. 4 and 5) used in the description of the above embodiments show blocks in terms of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0060] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit is called a transmitting unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0061] For example, the base station device 10, the user device 20, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 6 is a diagram showing an example of the hardware configuration of the base station device 10 and the user device 20 according to an embodiment of the present disclosure. The above base station device 10 and user device 20 may physically be 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.

[0062] In the following description, the term "apparatus" can be read as a circuit, device, unit, etc. The hardware configurations of the base station apparatus 10 and the user apparatus 20 may be configured to include one or more of the apparatuses shown in the figure, or may be configured without including some of the apparatuses.

[0063] Each function in the base station apparatus 10 and the user apparatus 20 is realized by causing a processor 1001 to perform operations by loading a predetermined software (program) onto hardware such as a processor 1001 and a storage device 1002, controlling communication by a communication device 1004, or controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0064] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, the above-described control units 140, 240, etc. may be realized by the processor 1001.

[0065] Further, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station device 10 shown in FIG. 4 may be stored in the storage device 1002 and realized by a control program that operates on the processor 1001. Also, for example, the control unit 240 of the user device 20 shown in FIG. 5 may be stored in the storage device 1002 and realized by a control program that operates on the processor 1001. Although it has been described that the above various processes are 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. Note that the program may be transmitted from a network via a telecommunication line.

[0066] The storage device 1002 is a computer-readable recording medium and may be composed of at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may be referred to as a register, cache, main memory (main storage device), etc. The storage device 1002 can store a program (program code), software module, etc. executable for implementing the communication method according to an embodiment of the present disclosure.

[0067] The auxiliary storage device 1003 is a computer-readable recording medium, which may be composed of, for example, at least one of 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 versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The auxiliary storage device 1003 may also be called an auxiliary memory device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0068] The communication device 1004 is hardware (a transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of frequency-division duplexing (FDD: Frequency Division Duplex) and time-division duplexing (TDD: Time Division Duplex). For example, a transmission / reception antenna, an amplifier section, a transmission / reception section, a transmission line interface, etc. may be realized by the communication device 1004. The transmission / reception section may be physically or logically separated into a transmission section and a reception section.

[0069] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0070] Also, 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 may be configured using different buses for each device.

[0071] Also, the base station device 10 and the user device 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0072] (Summary of Embodiment) As described above, according to the embodiment of the present invention, a receiving unit that receives from a base station device a measurement setting including an event including a condition for transmitting a measurement report, a control unit that executes a measurement based on the measurement setting, and a transmission unit that transmits a measurement report to the base station device based on the result of the executed measurement when a condition for transmitting the measurement report is satisfied, and the control unit provides a user device that changes a measurement method based on the result of the executed measurement.

[0073] With the above configuration, the user device 20 can change the measurement method so as to omit unnecessary measurements based on the measurement results. That is, in a wireless communication system, the user device can execute measurements efficiently.

[0074] Based on the results of the executed measurements, the control unit may change at least one of the number of cells to be measured, the number of frequency bands to be measured, the number of bands to be measured, the number of spatial reception parameters to be measured, the number of resources to be measured, the number of types of resources to be measured, the number of reference signals to be measured, the number of types of reference signals to be measured, the number of measurement objects to be measured, and the number of measurement configurations to be measured. With this configuration, the user equipment 20 can change the measurement method so as to omit unnecessary measurements based on the measurement results.

[0075] The control unit may compare the results of the executed measurements with the results of other measurements to determine whether to continue the executed measurements. With this configuration, the user equipment 20 can change the measurement method so as to omit unnecessary measurements based on the measurement results.

[0076] When the difference value between the results of the executed measurements and the threshold value at which the transmission of the measurement report is triggered is within a predetermined value, and the difference value between the results of the other measurements and the threshold value at which the transmission of the measurement report is triggered exceeds the predetermined value, the control unit may stop the other measurements. With this configuration, the user equipment 20 can change the measurement method so as to omit unnecessary measurements based on the measurement results.

[0077] After stopping the other measurements, when the difference value between the results of the executed measurements and the threshold value at which the transmission of the measurement report is triggered exceeds the predetermined value, the control unit resumes the other measurements. With this configuration, the user equipment 20 can resume measurements according to the communication situation after omitting unnecessary measurements based on the measurement results.

[0078] As described above, according to the embodiment of the present invention, there is provided a base station device including a transmission unit that transmits a measurement setting including an event for setting a condition for transmitting a measurement report to a user device, and a reception unit that receives, from the user device, a measurement report based on a result of a measurement executed based on the measurement setting, wherein the measurement setting includes information for changing a measurement method based on the result of the executed measurement.

[0079] With the above configuration, the user device 20 can change the measurement method so as to omit unnecessary measurements based on the measurement results. That is, in a wireless communication system, the user device can efficiently execute measurements.

[0080] (Supplement to the embodiment) The embodiments of the present invention have been described above. However, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, etc. Although specific numerical examples have been used for the purpose of facilitating the understanding of the invention, unless otherwise specified, those numerical values are merely examples and any appropriate values may be used. The classification of items in the above description is not essential to the present invention, and the matters described in two or more items may be used in combination as necessary, or the matters described in one item may be applied to the matters described in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For the sake of convenience in explaining the processing, the base station device 10 and the user device 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software that operates by the processor included in the base station device 10 according to the embodiment of the present invention and the software that operates by the processor included in the user device 20 according to the embodiment of the present invention may be stored in a random access memory (RAM), a flash memory, a read-only memory (ROM), an EPROM, an EEPROM, a register, a hard disk drive (HDD), a removable disk, a CD-ROM, a database, a server, or any other appropriate storage medium, respectively.

[0081] In addition, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and other methods may be used. For example, the notification of information may be implemented 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, notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Also, the RRC signaling may be referred to as an RRC message, and for example, it may be an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, etc.

[0082] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using 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), other suitable systems, and next-generation systems extended based thereon. Also, a plurality of systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0083] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be rearranged as long as there is no contradiction. For example, regarding the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0084] The specific operations assumed to be performed by the base station device 10 in this specification may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having the base station device 10, various operations performed for communication with the user device 20 can clearly be performed by at least one of the base station device 10 and other network nodes other than the base station device 10 (for example, but not limited to, an MME or an S-GW, etc.). Although the case where there is one other network node other than the base station device 10 is exemplified above, the other network node may be a combination of a plurality of other network nodes (for example, an MME and an S-GW).

[0085] The information or signals, etc. described in the present disclosure can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). They may also be input and output via a plurality of network nodes.

[0086] The input and output information, etc. may be stored in a specific location (for example, a memory) or may be managed using a management table. The input and output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0087] The determination in the present disclosure may be made based on a value represented by 1 bit (0 or 1), may be made based on a Boolean value (true or false), or may be made by comparing numerical values (for example, comparison with a predetermined value).

[0088] Software should be broadly construed to mean, whether called software, firmware, middleware, microcode, hardware description language, or by any other name, 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, etc.

[0089] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cables, optical fiber cables, twisted pairs, digital subscriber line (DSL), etc.) and wireless technologies (such as infrared rays, microwaves, etc.), at least one of these wired technologies and wireless technologies is included within the definition of the transmission medium.

[0090] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which 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.

[0091] Note that for the terms described in this disclosure and the terms necessary for understanding this disclosure, they may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0092] The terms "system" and "network" used in this disclosure are used interchangeably.

[0093] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or by using other corresponding information. For example, radio resources may be indicated by an index.

[0094] The names used for the above-described parameters are not limiting names in any way. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting names in any way.

[0095] In the present disclosure, terms such as "base station (BS: Base Station)", "radio base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0096] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0097] In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0098] A mobile station may also be called 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 some other appropriate terms.

[0099] At least one of the base station and the mobile station may also be called a transmission device, a reception device, a communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. 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.

[0100] Also, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of user devices 20 (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station device 10 may be configured to be functions of the user device 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, downlink channel, etc. may be replaced with side channels.

[0101] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal may be configured to be functions of the base station.

[0102] As used herein, the terms "determining" and "deciding" may encompass a variety of operations. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "decided". "Determining" and "deciding" may also include receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory), and considering something as having been "determined" or "decided". "Determining" and "deciding" may further include resolving, selecting, choosing, establishing, comparing, and considering something as having been "determined" or "decided". That is, "determining" and "deciding" may include considering something as having been determined by performing some operation. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", etc.

[0103] The terms "connected" or "coupled", or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electrical wires, cables, and printed electrical connections, and also, by way of some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region, etc.

[0104] The reference signal can also be abbreviated as RS (Reference Signal) and may be called a Pilot depending on the applicable standard.

[0105] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0106] Any reference to an element using designations such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any form.

[0107] In the configuration of each of the above devices, "means" may be replaced with "section", "circuit", "device", etc.

[0108] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0109] A wireless frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0110] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0111] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on numerology.

[0112] The slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0113] The radio frame, sub-frame, slot, mini-slot, and symbol all represent time units when transmitting signals. Different names corresponding to each of them may also be used.

[0114] For example, one sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, a mini-slot, etc. instead of a sub-frame.

[0115] Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user device 20) to each user device 20 in TTI units. Note that the definition of the TTI is not limited to this.

[0116] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0117] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0118] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0119] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and a TTI length of 1 ms or more.

[0120] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0121] Also, the time domain of the RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0122] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0123] Also, a resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0124] A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. A PRB is defined in a certain BWP and may be numbered within the BWP.

[0125] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). For a UE, one or more BWPs may be set within one carrier.

[0126] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0127] The structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols within a TTI, symbol length, cyclic prefix (CP) length, etc. can be variously changed.

[0128] In the present disclosure, for example, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0129] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". Note that the term may also mean "A and B are each different from C". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0130] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched for use during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, without performing the notification of the predetermined information).

[0131] As described in detail above regarding the present disclosure, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and has no restrictive meaning for the present disclosure.

Explanation of Reference Numerals

[0132] 10 Base station device 110 Transmission unit 120 Reception unit 130 Setting unit 140 Control unit 20 User device 210 Transmission unit 220 Reception unit 230 Setting unit 240 Control unit 1001 Processor 1002 Memory device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. a receiving unit that receives from a base station a measurement setting including conditions for transmitting a measurement report; a control unit that executes a measurement based on the measurement setting; a transmitting unit that transmits a measurement report to the base station based on the result of the measurement when the condition for transmitting the measurement report is satisfied, the control unit executes a relaxed measurement based on a threshold value notified for determining a change in the measurement method as a result of comparing the result of a first measurement with the result of a second measurement, and a condition notified for changing the measurement method; the control unit increases the measurement when a difference between the result of the relaxed measurement and the result of the previous relaxed measurement of the relaxed measurement is equal to or greater than the threshold value; a terminal.

2. a receiving procedure for receiving from a base station a measurement setting including conditions for transmitting a measurement report; a control procedure for executing a measurement based on the measurement setting; a transmitting procedure for transmitting a measurement report to the base station based on the result of the measurement when the condition for transmitting the measurement report is satisfied; a terminal executes a procedure for executing a relaxed measurement based on a threshold value notified for determining a change in the measurement method as a result of comparing the result of a first measurement with the result of a second measurement, and a condition notified for changing the measurement method; the measurement is increased when a difference between the result of the relaxed measurement and the result of the previous relaxed measurement of the relaxed measurement is equal to or greater than the threshold value; a measurement method.

3. a wireless communication system having a terminal and a base station, wherein the terminal has a receiving unit that receives from the base station a measurement setting including conditions for transmitting a measurement report; a control unit that executes a measurement based on the measurement setting; a transmitting unit that transmits a measurement report to the base station based on the result of the measurement when the condition for transmitting the measurement report is satisfied, the control unit executes a relaxed measurement based on a threshold value notified for determining a change in the measurement method as a result of comparing the result of a first measurement with the result of a second measurement, and a condition notified for changing the measurement method; the control unit increases the measurement when a difference between the result of the relaxed measurement and the result of the previous relaxed measurement of the relaxed measurement is equal to or greater than the threshold value; wherein the base station has a transmitting unit that transmits the measurement setting to the terminal; A wireless communication system having a receiving unit that receives a report of the measurement from the terminal.

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