Terminal device, base station device, control method, and program for performing efficient beam control

Abstract

To reduce a time between measuring a radio signal for beam selection and reporting the measurement results.SOLUTION: A terminal device measures a predetermined signal transmitted by a base station device for selecting a beam to be used in communication with the terminal device, and transmits at least a portion of the measurement results using a second radio resource on the basis of the fact that, among the radio resources corresponding to a timing after the timing at which the measurement has been made, a second radio resource corresponding to a timing earlier than a first radio resource to be used to report the measurement results is usable to transmit information other than the measurement results to the base station device.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to beam control techniques in cellular communication systems. [Background technology]

[0002] In a fifth-generation (5G) cellular communication system, a base station device and a terminal device can form beams to perform high-capacity communication. In the 5G cellular communication standard, a terminal device measures predetermined signals, such as SSB (Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block) and CSI-RS (Channel State Information-Reference Signal), transmitted in each of a plurality of beams formed by a base station device, and a beam to be used in communication between the base station device and the terminal device is determined based on the measurement result. Summary of the Invention [Problem to be solved by the invention]

[0003] The report by the terminal device of the radio quality of a predetermined signal from a plurality of beams formed in the base station device is transmitted using a physical uplink control channel (PUCCH) in radio resources that the base station device has previously assigned to the terminal device for reporting the radio quality. If the time from measurement of this predetermined signal to reporting is long, a beam that was appropriate at the time of measurement may not be appropriate at the time of selection. In other words, for highly accurate beam control, it is important to shorten the time from measurement to reporting. [Means for solving the problem]

[0004] The present invention provides a technique for reducing the time between measuring radio signals for beam selection and reporting the measurement results.

[0005] A terminal device according to one embodiment of the present invention has a measurement means for measuring a predetermined signal transmitted by a base station device for selecting a beam to be used in communication with the terminal device, and a transmission means for transmitting at least a part of a result of the measurement using a second radio resource, based on the fact that a second radio resource corresponding to a timing before a first radio resource to be used for reporting a result of the measurement, among radio resources corresponding to a timing after the timing at which the measurement was performed, can be used to transmit information different from the result of the measurement to the base station device.

[0006] A base station device according to one embodiment of the present invention has a transmitting means for transmitting a predetermined signal for selecting a beam to be used in communication with a terminal device, a receiving means for receiving at least a portion of the result of the measurement from the terminal device using the second radio resource based on the fact that a second radio resource corresponding to a timing earlier than a first radio resource used for the terminal device to report the result of measurement of the predetermined signal in the terminal device to the base station device, and the second radio resource corresponding to a timing later than the timing of transmitting the predetermined signal, can be used by the terminal device to transmit information different from the result of the measurement, and a setting means for setting a beam to be used in communication with the terminal device based on the result of the measurement. Effect of the Invention

[0007] According to the present invention, it is possible to reduce the time between measuring radio signals for beam selection and reporting the measurement results. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system. [Diagram 2] FIG. 1 is a diagram showing a conventional example of a process for setting a beam that can be used to transmit a downlink signal to a terminal device. [Diagram 3] FIG. 11 is a diagram illustrating an example of a processing flow of a first procedure. [Figure 4] FIG. 13 is a diagram for explaining a method of multiplexing measurement results. [Diagram 5] FIG. 13 is a diagram showing a modified example of the first procedure. [Figure 6] FIG. 11 is a diagram illustrating an example of the processing flow of the second procedure. [Figure 7] FIG. 13 is a diagram showing a modified example of the second procedure. [Figure 8] FIG. 2 illustrates an example of a hardware configuration of the apparatus. [Figure 9] FIG. 2 is a diagram illustrating an example of a functional configuration of a base station device. [Figure 10] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more features among the multiple features described in the embodiments may be arbitrarily combined. In addition, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0010] Fig. 1 shows an example of the configuration of a wireless communication system according to this embodiment. The wireless communication system is, for example, a cellular communication system conforming to the fifth generation (5G) cellular communication standard of the Third Generation Partnership Project (3GPP (registered trademark)), and includes a base station device 101 and a terminal device 111. Note that, although Fig. 1 shows only one base station device and one terminal device, it goes without saying that many base station devices and many terminal devices may exist.

[0011] The base station device 101 can form a plurality of beams and provide communication services to the terminal device 111 using some of the plurality of beams. The base station device 101 selects one of the plurality of beams and transmits a downlink signal to the terminal device 111 using the selected beam. When a different beam is used, the characteristics of the transmission path between the terminal device 111 and the base station device 101 differ, and the decoding process of the downlink signal to be executed in the terminal device 111 also differs. For this reason, when transmitting a downlink signal, the base station device 101 notifies the terminal device 111 of which beam the signal was transmitted using by using downlink control information (DCI). Here, since the base station device 101 can set a large number of beams, in a situation where all of the beams can be used, the beam used to transmit the downlink signal cannot be uniquely identified by the limited number of DCI bits. For this reason, a beam that can be used to transmit a downlink signal to the terminal device 111 can be selected from a large number of beams that the base station device 101 can use and can be set in the terminal device 111 in advance. The flow of this process will be described with reference to FIG. 2.

[0012] It is assumed that the base station device 101 notifies the terminal device 111 in advance of setting information for the terminal device 111 to measure and report the radio quality (channel state information (CSI)) of a predetermined signal for selecting a beam used between the base station device 101 and the terminal device 111, which is transmitted by the base station device 101 with each beam. The notification of this setting information is performed, for example, using a radio resource control (RRC) message such as an RRC Reconfiguration message. After that, the base station device 101 can instruct the terminal device 111 to measure the radio quality (S201). This measurement instruction is transmitted to the terminal device 111, for example, using a media access control element (MAC CE) or DCI. It is noted that the measurement and reporting may be instructed together with the setting information. That is, the terminal device 111 may perform measurement and reporting based on the setting information in response to receiving the setting information from the base station device 101, without receiving a separate instruction. The terminal device 111 measures the radio quality of a reference signal, such as at least one of an SSB (Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block) and a CSI-RS (Channel State Information-Reference Signal) transmitted from the base station device 101 (S202, S203). After performing the measurement, the terminal device 111 transmits the measurement result to the base station device 101 on a preconfigured physical uplink control channel (PUCCH) (S204).

[0013] The base station device 101 uses the result of the report received in S204 to determine one or more beams to be enabled (enabled) for downlink signal transmission to the terminal device 111 among a plurality of beams that the base station device 101 can use for transmitting downlink signals (S205). Each of the plurality of beams that the base station device 101 can form is associated with a Transmission Configuration Indication (TCI). Then, a beam that can be used for transmitting downlink signals to the terminal device 111 is set by enabling a TCI state indicating the state of the TCI. For example, the TCI state of a beam heading in a direction significantly different from the direction of the terminal device 111 is disabled, and the TCI state of at least a part of the beam heading in the direction of the terminal device 111 is enabled. Each TCI can be associated with a reference signal to be measured. For example, in the example of FIG. 1, TCI0 ​​to TCI8 can be associated with CSI-RS, and TCI9 to TCI11 can be associated with SSB. TCIn means TCI stateid=n. A plurality of TCIs having different TCI stateids are associated with different reference signals. That is, CSI-RS based on different radio resources (frequency and time resources) or sequences may be associated with TCI0 ​​to TCI8, and SSB based on different radio resources or sequences may be associated with TCI9 to TCI11. The base station device 101 notifies the terminal device 111 of configuration information of these reference signals, and the terminal device 111 can measure these reference signals based on the configuration information. In addition, when the base station device 101 and the terminal device 111 communicate using a plurality of cells, the TCI used by each cell may be associated with a reference signal provided by another cell, not with a reference signal provided by the cells. In this case, information for identifying which cell's reference signal is associated with which cell's TCI may be notified to the terminal device 111.

[0014] Then, the base station device 101 transmits to the terminal device 111 a MAC CE including information specifying one or more beams determined to be enabled for downlink signal transmission to the terminal device 111 (S206). The base station device 101 may notify the terminal device 111 of a TCI stateid specifying one or more beams to be enabled. The base station device 101 may notify the terminal device 111 of information such as a bitmap indicating enabled or disabled as a TCI state corresponding to each of a plurality of beams formed by the base station device 101. Thereafter, when transmitting a downlink signal (for example, a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH)) to the terminal device 111, the base station device 101 selects a beam to be used from one or more beams determined to be enabled in S205. Then, the base station device 101 includes information specifying the beam to be used in DCI in the PDCCH transmitted when transmitting the downlink signal, and transmits the DCI to the terminal device 111 (S207).

[0015] In this way, in order to set a downlink beam, the terminal device 111 needs to receive a CSI measurement report instruction from the base station device 101, report the CSI, and receive designation of one or more beams that are determined to be enabled based on the result of the report. In this way, a certain amount of time is required to set an appropriate beam between the base station device 101 and the terminal device 111. If the time from when the measurement is performed to when the communication is actually performed becomes long, there may be a case where the radio environment at the time of measurement and when the communication is performed is significantly different. In this case, the beam to be used is not appropriately selected, and the efficiency of the communication may decrease.

[0016] In view of the above circumstances, the present embodiment provides a method for shortening the time from measurement to selection and use of a beam. More specifically, the present embodiment provides a procedure for shortening the time from measurement in S202 to reporting in S204, for example.

[0017] (Processing flow) In the first procedure, when the terminal device 111 has an opportunity to transmit an uplink signal at a timing earlier than a preset timing, the terminal device 111 transmits at least a part of the measurement result of the reference signal transmitted from the base station device 101 at that opportunity. For example, the terminal device 111 determines whether a second radio resource for transmitting an uplink signal is available at a second timing prior to the first timing corresponding to the (preset) first radio resource used for reporting after the measurement timing of the reference signal. Then, the terminal device 111 transmits at least a part of the measurement result in the second radio resource on the condition that the second radio resource is available. For example, the terminal device 111 may transmit the entire measurement result using the second radio resource. This can shorten the time difference between the timing at which the terminal device 111 measures the reference signal and the timing at which the report is made, and it becomes possible to perform communication using an appropriate beam between the base station device 101 and the terminal device 111. Note that the terminal device 111 does not need to transmit anything in the first radio resource. Furthermore, the terminal device 111 may transmit a small amount of information, such as information indicating whether the radio quality (for at least a part of the multiple beams) has improved or deteriorated, to the base station device 101 in the second radio resource, and transmit the remaining information (for example, information indicating the value of the radio quality) to the base station device 101 in another radio resource thereafter. Here, the other radio resource after the second radio resource may be the first radio resource preconfigured for measurement reporting, or may be another radio resource. For example, when a third radio resource that is later than the second radio resource and earlier than the first radio resource is available for uplink communication, the terminal device 111 may transmit a part of the measurement result to the base station device 101 using the second radio resource, and transmit the remaining information to the base station device 101 using the third radio resource.In addition, for example, when the difference between the first timing and the second timing is less than a predetermined value (when there is not much difference), the terminal device 111 may not report the measurement results at the second timing, but may report the measurement results at the first timing, which is the original reporting timing.

[0018] The first preconfigured radio resource is, for example, a PUCCH preconfigured for measurement reporting. On the other hand, the second radio resource is a PUCCH not preconfigured for measurement reporting or a physical uplink shared channel (PUSCH). As an example, the terminal device 111 can use, as the second radio resource, a radio resource for transmitting a composite automatic repeat request acknowledgement (HARQ-ACK) to the base station device 101 after receiving a PDSCH from the base station device 101. An example of the flow of this process is shown in FIG. 3. In this processing example, it is assumed that the terminal device 111 measures a reference signal such as an SSB or CSI-RS transmitted from the base station device 101 (S202, S203), and then receives a PDSCH in which a HARQ-ACK transmission occurs before the radio resource (S204) preconfigured for transmitting the measurement result to the base station device 101 (S301). In response to receiving this PDSCH, the terminal device 111 transmits a HARQ-ACK, and at the same time, transmits at least a part of the measurement result (S302). The terminal device 111 transmits the measurement result in a radio resource that can be used to transmit this HARQ-ACK, but may transmit the measurement result in a resource that is different in frequency or time from the radio resource in which the HARQ-ACK is actually transmitted. The terminal device 111 can also multiplex at least a part of the measurement result into the HARQ-ACK to be transmitted by modulating the HARQ-ACK to be transmitted using information indicating the measurement result.

[0019] 4(A) to 4(C) show examples of modulation of HARQ-ACK. For example, as shown in FIG. 4(A), the terminal device 111 changes the subcarrier on which the HARQ-ACK is transmitted, according to the information indicating the result of the measurement. That is, the terminal device 111 can transmit the information indicating the result of the measurement by frequency-modulating the HARQ-ACK. The base station device 101 can acquire each piece of information by demultiplexing the information indicating the result of the measurement and the information on the HARQ-ACK, by identifying which subcarrier the information on the HARQ-ACK is transmitted on. Note that FIG. 4(A) shows an example in which different subcarriers are used when the wireless quality of the measurement result is lower than the value reported last time and when it is not, but more detailed information on the measurement result may be multiplexed. In that case, the number of available subcarriers is increased, and the terminal device 111 selects one or more subcarriers to be used for transmitting the HARQ-ACK from the group of subcarriers, and transmits the selected subcarriers. Here, by associating the subcarrier selection pattern with the information to be transmitted, the terminal device 111 transmits HARQ-ACK using the subcarrier corresponding to the information to be transmitted. Then, the base station device 101 can obtain information on the measurement result according to the pattern of which subcarrier the HARQ-ACK is transmitted on. In one example, the terminal device 111 can transmit information on the measurement result by varying the subcarrier on which the HARQ-ACK is transmitted over time in a specific pattern.

[0020] Also, as shown in FIG. 4(B), the terminal device 111 may multiplex the information on the measurement result onto the HARQ-ACK by changing the frequency and time resource for transmitting the HARQ-ACK and transmit the multiplexed information. That is, the terminal device 111 may multiplex the information on the measurement result onto the HARQ-ACK by index modulation. In this case, too, a plurality of patterns of frequency and time resource available for transmitting the HARQ-ACK are prepared, and the information on the measurement result is notified from the terminal device 111 to the base station device 101 depending on which pattern is used. Also, for example, as shown in FIG. 4(C), the information on the measurement result may be multiplexed onto the HARQ-ACK by changing (phase modulating) the phase of the constellation on the IQ (in-phase-quadrature) plane of the HARQ-ACK. In the example of Fig. 4(C), when the HARQ-ACK is expressed by +1 or -1 and information indicating a quality degradation is multiplexed, the phase of the HARQ-ACK is changed by 45 degrees on the IQ plane, and when other information is multiplexed, the phase of the HARQ-ACK is changed by -45 degrees on the IQ plane. Note that not only the phase value but also the amplitude value may be changed.

[0021] Also, the value transmitted in the HARQ-ACK may be spread by a code with a predetermined number of bits, and the spreading code used for the spreading may correspond to the information of the measurement result. That is, the terminal device 111 identifies a code corresponding to the information of the measurement result from among the available codes, and spreads (code-modulates) the information of the HARQ-ACK using the code. Then, the terminal device 111 may transmit the spread code using a radio resource capable of transmitting the HARQ-ACK. In this way, the terminal device 111 may multiplex the information of the measurement result into the HARQ-ACK and transmit it using various methods. Note that the radio resource available for transmitting the HARQ-ACK is an example of a radio resource available for transmitting the information of the measurement result, and the information of the measurement result may be transmitted (e.g., multiplexed) in a radio resource available for transmitting other uplink signals.

[0022] In addition, when a radio resource for transmitting user data is assigned, the terminal device 111 may transmit the measurement result using the radio resource. That is, when a radio resource for transmitting a PUSCH to the base station device 101 is assigned at a timing earlier than the radio resource preset for reporting the measurement result, the terminal device 111 reports the measurement result using the radio resource for PUSCH transmission. FIG. 5 shows an example of a processing flow in this case. The base station device 101 assigns a radio resource for PUSCH transmission to the terminal device 111 at a timing earlier than the radio resource preset for reporting the measurement result (S204). The base station device 101 transmits a PDCCH for the assignment (S501). Then, the terminal device 111 transmits a measurement report to the base station device 101 together with user data in the radio resource for PUSCH transmission (S502). In addition, the terminal device 111 may transmit the measurement report using MAC CE, or may transmit the measurement report as user data.

[0023] In addition, for example, when there are both a radio resource for PUCCH (for example, for HARQ-ACK) and a radio resource for PUSCH at a timing earlier than the preset radio resource for measurement report, the terminal device 111 may determine which of them to use based on the data amount of the measurement report. That is, the terminal device 111 may determine to use the radio resource for PUCCH when transmitting a measurement report with a small amount of data such as, for example, a decrease in radio quality, and to use the radio resource for PUSCH when transmitting a measurement report with a relatively large amount of data such as a value indicating radio quality (for example, reference signal received power (RSRP) or reference signal received quality (RSRQ)). In addition, the terminal device 111 may transmit part of the information using the radio resource for PUCCH and transmit the remaining information using the radio resource for PUSCH. In addition, the terminal device 111 may transmit part of the information using the radio resource for PUCCH or the radio resource for PUSCH at a timing earlier than the preset radio resource, and transmit the remaining information using the preset radio resource.

[0024] The base station device 101 receives at least a part of the information on the measurement result at a timing earlier than the preset radio resource, and can use the information to set the beam to be used for communication with the terminal device 111. For example, when the base station device 101 receives a report that the radio quality has deteriorated for a specific beam, the base station device 101 can prevent the beam from being used for communication with the terminal device 111 for at least a certain period of time (for example, until detailed information arrives). Furthermore, when the base station device 101 receives detailed information on the measurement result for a specific beam, it can perform control such as beam selection in the same manner as in the past.

[0025] In the second procedure, when the base station device 101 transmits a downlink signal (PDSCH) to the terminal device 111 after transmitting a reference signal for beam selection and before a timing corresponding to a radio resource preset for reporting a measurement result of the reference signal, the terminal device 111 performs measurement based on the downlink signal and notifies the base station device 101 of the measurement result. An example of the flow of this process is shown in FIG. 6. The base station device 101 transmits SSB or CSI-RS (S202), and the terminal device 111 measures the radio quality of those reference signals (S203). Then, before the timing of the radio resource (S204) preset for measuring the radio quality, the base station device 101 transmits a downlink signal (PDSCH) including user data to the terminal device 111 (S601). The terminal device 111 measures the radio quality using, for example, a demodulation reference signal (DM-RS) transmitted together with the PDSCH (S602). The terminal device 111 performs measurement on the downlink signal transmitted using the beam instructed by the base station device 101 to perform measurement reporting of the reference signal. That is, the beam used in the measurement in S203 and the beam used in the measurement in S602 are the same beam. Then, the terminal device 111 transmits the radio quality measured in S602 to the base station device 101, instead of the radio quality measured in S203, using radio resources preset for the measurement report in S203 (S204). With this, even if the timing of the measurement report remains the same as in the past, it is possible to notify the base station device 101 of the result of the measurement performed at a timing closer to the timing of the report. In this case, the base station device 101 performs control such as beam selection using the received measurement result, as in the past.

[0026] Also, the first procedure and the second procedure may be used in combination. FIG. 7 shows an example of a process flow in that case. After receiving the measurement configuration and the measurement instruction, the terminal device 111 performs a first measurement (S202, S203) on the reference signal to be measured (SSB or CSI-RS) and a second measurement (S601, S602) on other downlink signals (for example, DM-RS associated with PDSCH). When an opportunity to transmit an uplink signal is obtained at a timing earlier than the radio resource preset for reporting the first measurement, the base station device 101 transmits at least a part of the measurement result of the second measurement to the base station device 101 at that opportunity (S301, S302). This allows the base station device 101 to quickly and appropriately set a beam to be used for communication with the terminal device 111. Note that the example of FIG. 7 shows an example in which the measurement result is multiplexed with HARQ-ACK, but various modifications of the first procedure, such as using MAC CE as in FIG. 5, can be naturally applied.

[0027] (Device configuration) FIG. 8 shows an example of the hardware configuration of the base station device 101 and the terminal device 111 according to the present embodiment. In one example, the base station device 101 and the terminal device 111 are configured to include a processor 801, a ROM 802, a RAM 803, a storage device 804, and a communication circuit 805. The processor 801 is a computer configured to include one or more processing circuits such as a general-purpose CPU (Central Processing Unit) or an ASIC (Application Specific Integrated Circuit), and executes the overall processing of the device and each of the above-mentioned processes by reading and executing a program stored in the ROM 802 or the storage device 804. The ROM 802 is a read-only memory that stores information such as programs and various parameters related to the processing executed by the base station device 101 and the terminal device 111. The RAM 803 functions as a workspace when the processor 801 executes a program, and is a random access memory that stores temporary information. The storage device 804 is configured, for example, by a removable external storage device. The communication circuit 805 is configured, for example, by a circuit for wireless communication of 5G or its successor standard. Although one communication circuit 805 is illustrated in FIG. 8, the base station device 101 and the terminal device 111 may have multiple communication circuits. For example, the base station device 101 and the terminal device 111 may have wireless communication circuits for 5G and its successor standard, and a common antenna for those circuits. The base station device 101 and the terminal device 111 may have separate antennas suitable for each standard. The base station device 101 may further have a wired communication circuit used when communicating with other base station devices and nodes of the core network. The terminal device 111 may further have a communication circuit conforming to a wireless communication standard other than the cellular communication standard, such as a wireless local area network (LAN) or Bluetooth (registered trademark). The base station device 101 and the terminal device 111 may have separate communication circuits 805 for each of a plurality of available frequency bands, or may have a common communication circuit 805 for at least a part of those frequency bands.

[0028] FIG. 9 is a diagram showing an example of a functional configuration of a base station device 101 according to this embodiment. The base station device 101 includes, as its functions, a reference signal transmission unit 901, a report setting unit 902, a communication processing unit 903, a report receiving unit 904, and a beam setting unit 905. Note that FIG. 9 shows only functions particularly related to this embodiment, and various other functions that the base station device 101 may have are omitted from the illustration. For example, the base station device 101 naturally has other functions that a base station device conforming to 5G or its subsequent standards generally has. Also, the functional blocks in FIG. 9 are shown in a schematic manner, and each functional block may be integrated and realized, or may be further subdivided. Also, each function in FIG. 9 may be realized, for example, by the processor 801 executing a program stored in the ROM 802 or the storage device 804, or may be realized, for example, by a processor present inside the communication circuit 805 executing predetermined software. Note that the details of the processing performed by each functional unit are as described above, and the description will not be repeated here, and only the rough functions will be outlined.

[0029] The reference signal transmission unit 901 transmits a reference signal, such as an SSB or a CSI-RS, used to select a beam to be used for communication with the terminal device 111. In addition, when transmitting a PDSCH, the reference signal transmission unit 901 transmits a DM-RS for demodulation of the PDSCH. The report setting unit 902 sets radio resources for the terminal device 111 to report measurement results of the SSB, CSI-RS, and the like transmitted in each of a plurality of beams formed by the base station device 101. The report setting unit 902 notifies the terminal device 111 of the radio resource setting. The communication processing unit 903 executes communication processing with the terminal device 111. For example, the communication processing unit 903 executes processing to transmit a downlink signal (PDSCH) to the terminal device 111 and receive a HARQ-ACK for the PDSCH. Note that the communication processing unit 903 executes communication processing so as to transmit a control signal, such as a DM-RS, together with the PDSCH, for example. Moreover, the communication processing unit 903 executes a communication process of allocating radio resources to the terminal device 111 for transmitting an uplink signal (PUSCH) and receiving a radio signal from the terminal device 111 via the radio resources. The report receiving unit 904 receives information on a measurement result from the terminal device 111. For example, the report receiving unit 904 receives the measurement result in a pre-configured radio resource for reporting the measurement result of SSB or CSI-RS. Furthermore, when the terminal device 111 is in a state in which an uplink radio resource corresponding to a timing earlier than the pre-configured radio resource is available, the report receiving unit 904 can monitor the radio resource and determine whether a measurement result report from the terminal device 111 has arrived. For example, when a PDSCH is transmitted to the terminal device 111, if the report receiving unit 904 determines that a HARQ-ACK for the PDSCH is transmitted at a timing earlier than the pre-configured radio resource, the report receiving unit 904 can monitor whether a measurement report has been multiplexed and received in the HARQ-ACK. When the measurement report is multiplexed in the HARQ-ACK, the report receiving unit 904 performs demultiplexing processing to separate and acquire the measurement report and the HARQ-ACK information.Furthermore, when the report receiving unit 904 determines that a radio resource for transmitting a PUSCH has been allocated to the terminal device 111 at a timing earlier than the preset radio resource, the report receiving unit 904 can determine whether a measurement report has been received in the radio resource. For example, when a MAC CE for a measurement report is received in a radio resource for a PUSCH, the report receiving unit 904 can receive the measurement report by decoding the MAC CE. The beam setting unit 905 executes setting processing such as selection of a beam usable between the terminal device 111 and the terminal device 111 based on the measurement result of the radio quality in the terminal device 111 received by the report receiving unit 904.

[0030] FIG. 10 is a diagram showing an example of the functional configuration of the terminal device 111 according to this embodiment. The terminal device 111 includes, for example, a measurement unit 1001 and a measurement result reporting unit 1002 as its functions. Note that FIG. 10 shows only functions particularly related to this embodiment, and various other functions that the terminal device 111 may have are omitted from the illustration. For example, the terminal device 111 naturally has other functions that terminal devices conforming to 5G and subsequent standards generally have. In addition, the functional blocks in FIG. 10 are shown in schematic form, and each functional block may be integrated and realized, or may be further subdivided. In addition, each function in FIG. 10 may be realized, for example, by the processor 801 executing a program stored in the ROM 802 or the storage device 804, or may be realized, for example, by a processor present inside the communication circuit 805 executing a predetermined software. Note that the details of the processing performed by each functional unit are as described above, and the description will not be repeated here, and only the rough functions will be outlined.

[0031] The measurement unit 1001 performs measurement of radio quality based on a reference signal transmitted from the base station device 101. For example, in response to receiving a measurement instruction, the measurement unit 1001 measures the reception quality (e.g., RSRP and RSRQ) of SSB and CSI-RS transmitted in at least a part of a plurality of beams formed by the base station device 101. In addition, in one embodiment, when the measurement unit 1001 receives a downlink signal in a beam in which the measurement of the reception quality of SSB or CSI-RS has been performed before reporting the measurement result, the measurement unit 1001 may measure the reception quality of the downlink signal. The measurement result reporting unit 1002 reports the radio quality measured by the measurement unit 1001 to the base station device 101. The measurement result reporting unit 1002 may transmit a signal reporting the measurement result in a radio resource for reporting that is preset by the base station device 101, for example. Furthermore, when there is a second radio resource capable of transmitting an uplink signal at a timing before the preset first radio resource for reporting, the measurement result reporting unit 1002 may transmit a report of the measurement result in the second radio resource. The method of reporting the measurement result in the second radio resource is as described above, and therefore the description will not be repeated here. Furthermore, the measurement result reporting unit 1002 may transmit a part of the measurement result in the second radio resource, and transmit the remaining part in the first radio resource or a third radio resource different from the first radio resource and the second radio resource. In one example, the measurement result reporting unit 1002 multiplexes the measurement result with HARQ-ACK, which is a response to the reception of PDSCH, at a timing before the preset radio resource and reports a part of the measurement result. Furthermore, the measurement result reporting unit 1002 may report the remaining part of the measurement result in a radio resource for PUSCH, which is similarly assigned at a timing before the preset radio resource. For example, if the measurement result reporting unit 1002 is able to report all the measurement results at a timing prior to the timing of the preset radio resource, the measurement result reporting unit 1002 may not need to use the preset radio resource.Furthermore, for example, when the measurement unit 1001 performs a second measurement of the radio quality of the DM-RS or the like after performing a first measurement of the radio quality of the SSB or CSI-RS and before reporting the measurement, the measurement result reporting unit 1002 may report only the result of the second measurement and not report the result of the first measurement. Furthermore, the measurement result reporting unit 1002 may report both the result of the second measurement and the result of the first measurement to the base station device 101.

[0032] With the above-described configuration, it is possible to reduce the time from when the terminal device 111 measures a signal from the base station device 101 until the result of the measurement is reported. As a result, it is possible for the base station device 101 to more appropriately select a beam to be used for communication with the terminal device 111. This makes it possible to contribute to Goal 9 of the Sustainable Development Goals (SDGs) led by the United Nations, which is to "build resilient infrastructure, promote sustainable industrialization and foster innovation."

[0033] The invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the gist of the invention.

Claims

1. A terminal device, A measurement means for measuring a predetermined signal transmitted by a base station device for selecting a beam to be used in communication with the terminal device; a transmitting means for transmitting at least a part of a result of the measurement using a second radio resource, the second radio resource corresponding to a timing earlier than a first radio resource to be used for reporting a result of the measurement, among radio resources corresponding to a timing after the timing at which the measurement was performed, based on the fact that the second radio resource is usable for transmitting information other than the result of the measurement to the base station device; A terminal device comprising:

2. the transmitting means multiplexes at least a part of the result of the measurement with a composite automatic repeat request acknowledgement (HARQ-ACK) for a physical downlink shared channel (PDSCH) received from the base station device, and transmits the result in the second radio resource available for transmitting the HARQ-ACK.

2. The terminal device according to claim 1 .

3. The terminal device according to claim 2, characterized in that the transmitting means performs multiplexing by modulating the HARQ-ACK using at least a part of the results of the measurement.

4. The terminal device according to claim 2, characterized in that the transmitting means transmits a portion of the measurement results in the second radio resource usable for transmitting the HARQ-ACK, and transmits the remaining portion of the measurement results in a radio resource at a timing later than the second radio resource.

5. 2. The terminal device according to claim 1 , wherein the transmitting means transmits at least a part of the results of the measurements using a Medium Access Control Element (MAC CE) in the second radio resource allocated by the base station device for transmission of a Physical Uplink Shared Channel (PUSCH) by the terminal device.

6. A base station device, A transmitting means for transmitting a predetermined signal for selecting a beam to be used in communication with a terminal device; a receiving means for receiving at least a part of the result of the measurement from the terminal device using the second radio resource, based on the fact that the second radio resource corresponds to a timing earlier than a first radio resource used for the terminal device to report a result of the measurement of the predetermined signal in the terminal device to the base station device, and the second radio resource corresponds to a timing later than a timing of transmitting the predetermined signal, and is usable by the terminal device to transmit information different from the result of the measurement; A setting means for setting a beam to be used in communication with the terminal device based on a result of the measurement; A base station device comprising:

7. At least a part of the result of the measurement is multiplexed with a composite automatic repeat request acknowledgement (HARQ-ACK) for a physical downlink shared channel (PDSCH) transmitted by the base station device, and transmitted in the second radio resource available for transmitting the HARQ-ACK; The receiving means obtains at least a portion of the measurement result multiplexed with the HARQ-ACK by demultiplexing. The base station device according to claim 6 .

8. the multiplexing is performed by modulating the HARQ-ACK with at least a portion of the results of the measurements; The base station apparatus according to claim 7, characterized in that the receiving means performs the demultiplexing by demodulating the HARQ-ACK.

9. The base station device according to claim 7, characterized in that the receiving means receives a portion of the measurement result in the second radio resource that the terminal device can use to transmit the HARQ-ACK, and receives the remaining portion of the measurement result in a radio resource at a timing later than the second radio resource.

10. the second radio resource is a radio resource allocated by the base station device for transmission of a physical uplink shared channel (PUSCH) by the terminal device, 7. The base station apparatus according to claim 6, wherein the receiving means receives at least a part of the result of the measurement by a medium access control element (MAC CE) transmitted from the terminal apparatus in the second radio resource.

11. A control method executed by a terminal device, comprising: Measuring a predetermined signal transmitted by a base station device for selecting a beam to be used in communication with the terminal device; transmitting at least a part of the result of the measurement using a second radio resource, the second radio resource corresponding to a timing earlier than a first radio resource to be used for reporting the result of the measurement, among radio resources corresponding to a timing after the timing at which the measurement was performed, based on the fact that the second radio resource is usable for transmitting information other than the result of the measurement to the base station device; A control method comprising:

12. A control method executed by a base station device, comprising: Transmitting a predetermined signal for selecting a beam to be used in communication with a terminal device; receiving at least a portion of the result of the measurement from the terminal device using the second radio resource, based on the fact that the second radio resource corresponds to a timing earlier than a first radio resource used for the terminal device to report a result of the measurement of the predetermined signal in the terminal device to the base station device, and corresponds to a timing later than a timing of transmitting the predetermined signal, and is usable by the terminal device to transmit information different from the result of the measurement; setting a beam to be used in communication with the terminal device based on a result of the measurement; A control method comprising:

13. A program for causing a computer installed in a terminal device to execute the control method according to claim 11.

14. A program for causing a computer installed in a base station device to execute the control method according to claim 12.

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