Base station device and terminal device

Abstract

This base station device comprises: a reception unit that receives, from a terminal device, an event-triggered beam report transmitted when a prescribed condition is satisfied; a transmission unit that transmits, to the terminal device, beam report configuration information relating to the beam report; and a control unit that counts the number of reference signal resources and the number of ports, which are simultaneously measured in the terminal device, in accordance with the prescribed condition.

Description

Base station equipment and terminal equipment

[0001] This invention relates to base station equipment and terminal equipment.

[0002] In a wireless communication system, terminal equipment measures the beam transmitted by the connected cell in order to determine the appropriate beam for receiving signals from the base station equipment. Furthermore, as terminal equipment moves and switches to other cells, it measures the beam transmitted by adjacent cells other than the cell with which it is currently communicating or camped on (sometimes referred to as the current cell). The base station equipment notifies the terminal equipment of the CSI (Channel State Information) report settings, for example, to instruct the terminal equipment to perform beam measurements. The CSI report settings include information on the reference signal resource set. The reference signal resource set includes at least one reference signal resource, such as a Synchronization Signal and PBCH Block (SSB) or a Channel State Information Reference Signal (CSI-RS) resource. The terminal device periodically measures the L1 Reference Signal Received Power (L1-RSRP) or L1 Signal to Noise and Interference Ratio (L1-SINR) of a reference signal resource, and transmits the identifier of at least one reference signal and the L1-RSRP or L1-SINR of that reference signal as measurement results to the base station device of the current cell in a CSI report. This CSI report reflects at least one optimal beam and its quality and is used by the base station device to determine the beam for which to transmit a channel or signal to the terminal device. This CSI report may also be called a beam report.

[0003] However, in such beam management, even a terminal device that is not moving or is moving at a slow speed will transmit measurement results periodically, resulting in a communication load in wireless communication.

[0004] Therefore, in order to reduce this communication load, beam reporting based on an event trigger is being considered. The terminal device performs beam measurements, but transmits the measurement results only when the conditions of an event that serves as a trigger are satisfied. This can reduce the number of transmissions of measurement results and thus reduce the communication load.

[0005] The base station device considers how many reference signals and antenna ports of the reference signals (which may be called ports) can be measured simultaneously according to the processing capacity of the terminal device, and instructs the terminal device to perform beam measurements. The base station device and the terminal device count the number of reference signal resources and the number of antenna ports that the terminal device measures simultaneously in a certain beam reporting setting, and sum up the counts of each beam reporting setting to count the total number. This count may be counted multiple times even for the same reference signal resource or the antenna port of the same reference signal.

[0006] Regarding beam reporting based on an event trigger, it is described in, for example, the following documents.

[0007] 3GPP TS 37.324 V18.0.0 3GPP TS 37.340 V18.4.0 3GPP TS 38.133 V18.8.0 3GPP TS 38.201 V18.0.0 3GPP TS 38.202 V18.5.0 3GPP TS 38.211 V18.5.0 3GPP TS 38.212 V18.5.0 3GPP TS 38.213 V18.5.0 3GPP TS 38.214 V18.5.0 3GPP TS 38.215 V18.4.0 3GPP TS 38.

[0008] However, it has not been decided how to count measurements in event-triggered beam reports. If the reference signal and the antenna port of the reference signal are not counted in event-triggered beam reports, the number of reference signals and antenna ports measured may exceed the processing capacity of the terminal device, resulting in the terminal device being unable to transmit an appropriate beam report.

[0009] Therefore, one disclosure provides a base station device and a terminal device that can count the number of reference signal resources and antenna ports to be measured, taking into account the measured beam in an event-triggered beam report.

[0010] The system includes a receiving unit that receives event trigger beam reports transmitted from a terminal device when predetermined conditions are met, a transmitting unit that transmits beam report setting information related to the beam reports to the terminal device, and a control unit that counts the number of reference signal resources and ports simultaneously measured by the terminal device according to the predetermined conditions.

[0011] One disclosure allows for counting the number of reference signal resources and antenna ports to be measured, taking into account the measured beam in the event-triggered beam report.

[0012] Figure 1 shows an example configuration of the wireless communication system 10. Figure 2 shows an example configuration of the base station device 200. Figure 3 shows an example configuration of the terminal device 100. Figure 4 shows an example of a beam report due to a trigger event. Figure 5 shows an example of a counting flowchart. Figure 6 shows an example of counting when the event trigger beam report set is not included. Figure 7 shows an example of counting when the event trigger beam report set is included. Figure 8 shows an example of the period for counting beams. Figure 9 shows an example of how the counting method in the beam report of the 1st type event trigger is reflected in the specification. Figure 10 shows an example of how the counting method in the beam report of the 2nd type event trigger is reflected in the specification.

[0013] [First Embodiment] The first embodiment will now be described.

[0014] Figure 1 shows an example configuration of a wireless communication system 10. The wireless communication system 10 includes a base station device 200 and a terminal device 100.

[0015] The base station device 200 is a device that wirelessly connects to the terminal device 100 and performs wireless communication. The base station device 200 may be a small wireless base station device such as a macro wireless base station device or a pico wireless base station device (including a micro wireless base station device, a femto wireless base station device, etc.), or a wireless base station device of various sizes, and may be described as a wireless communication device, communication device, transmitting device, transmission and reception point (TRP), etc. The base station device 200 constitutes a communication cell A200 capable of wireless communication.

[0016] Terminal device 100 is a communication device that wirelessly connects to base station device 200 and transmits and receives data. Terminal device 100 may be a wireless terminal device such as a mobile phone, smartphone, PDA (Personal Digital Assistant), personal computer, vehicle, airplane, drone, or other devices with wireless communication capabilities, or a device (sensor device, etc.) mounted on a robot, AV equipment, home appliance, office equipment, vending machine, other household equipment, industrial equipment, etc. It may also be referred to as a wireless communication device, communication device, receiving device, mobile station, etc. The current cell of terminal device 100 is the cell corresponding to communication cell A200. Terminal device 100 supports beam reporting triggered by events.

[0017] Furthermore, the base station device 200 transmits TCI (Transmission Configuration Indicator) status setting information to the terminal device 100 in order to control the reception processing in the terminal device 100. The TCI status setting information includes information on one or more TCI states. The TCI status information includes a TCI status identifier, a quasi-co-location (QCL) relationship, and source reference signal information. The source reference signal information includes at least the reference signal identifier (ID) and transmission information. The QCL relationship represents at least one parameter from among Doppler shift, Doppler spread, average delay, delay spread, and spatial reception parameter (spatial Rx parameter). QCL relationships are classified into, for example, QCL type A, QCL type B, QCL type C, and QCL type D. QCL type D represents, for example, a spatial reception parameter. Furthermore, the source reference signal is either SSB or periodic CSI-RS.

[0018] Furthermore, the base station device 200 activates one or more TCI states included in the TCI state setting information to the terminal device 100. This activation is performed using at least one control information from among the RRC (radio resource control) signal and MAC-CE (Medium Access Control-Control Element). When MAC-CE is used, for example, the activation or deactivation state of one or more TCI states is included in the MAC-CE and transmitted to activate or deactivate the TCI state. Also, if only information on one TCI state is notified by the RRC signal, that TCI state is activated, and it is not necessary to notify the activation state using MAC-CE. The RRC signal is one of RRC Configuration, RRC Reconfiguration, or RRC Resume.

[0019] Furthermore, the base station device 200 notifies the terminal device 100 of the TCI state for receiving a channel or signal from among multiple activated TCI states. This notification is made using DCI (Downlink Control Information). Alternatively, this notification may be transmitted by including the index of the TCI state among the multiple activated TCI states in the DCI. Note that if only information on one TCI state is notified by the RRC signal, that TCI state becomes the TCI state for receiving a channel or signal, and it is not necessary to notify it using DCI. Also, if only one TCI state is indicated as activated by MAC-CE, that candidate TCI state becomes the TCI state for receiving a channel or signal, and it is not necessary to notify it using DCI. The terminal device 100 receives the channel or signal according to the source reference signal and QCL relationship corresponding to the indicated TCI state. For example, if the QCL relationship is QCL type D, the terminal device 100 may assume that the channel or signal to be received is transmitted via the same transmit beam as the source reference signal. Furthermore, the receiving channel is, for example, PDSCH (Physical Downlink Shared Channel) or PUSCH (Physical Uplink Shared Channel). The receiving signal is, for example, DMRS (Demodulation Reference Signal) for PDSCH, DMRS, CSI-RS, or SRS (Sounding Reference Signal) for PUSCH.

[0020] The terminal device 100 determines the reference signal for quality measurement of the current beam (sometimes called the current beam reference signal) in the following way: • The current beam reference signal is the source reference signal in the TCI state specified by the base station device 200. • The current beam reference signal is an SSB that is in a QCL relationship with the source reference signal (if the source reference signal is CSI-RS) in the TCI state specified by the base station device 200. This SSB is the source reference signal for the CSI-RS, which is the source reference signal in the specified TCI state.

[0021] The current beam is, for example, the beam from which the cell (base station equipment 200) used for communication transmits channels and signals when the terminal device 100 is using wireless communication. That is, the TCI state specified by the base station equipment 200 is the TCI state when transmitting channels and signals. In the following explanation, the current beam corresponding to the TCI state when transmitting channels and signals will be referred to as the communication beam, and the reference signal for quality measurement of the communication beam will be referred to as the communication beam reference signal. The communication beam reference signal is CSI-RS or SSB.

[0022] Furthermore, the current beam is, for example, the Q-th candidate beam transmitted by the base station device 200 (current cell) to the terminal device 100. That is, the TCI state specified by the base station device 200 is the TCI state with the Q-th reception quality among the activated TCI states. Q is, for example, an integer of 1 or more. Also, Q is, for example, an integer from 1 to 8. In the following explanation, the beam corresponding to an activated TCI state will be referred to as a candidate beam, the beam corresponding to the Q-th TCI state will be referred to as the Q-th candidate beam, and the reference signal for quality measurement for the candidate beam will be referred to as the candidate beam reference signal. The candidate beam reference signal is CSI-RS or SSB.

[0023] Furthermore, the base station device 200 transmits beam report settings to the terminal device 100. The beam report settings include information on a reference signal resource set for beam measurement. The reference signal resource set includes at least one reference signal resource, for example, an SSB or CSI-RS resource. The reference signal resource set includes at least a reference signal resource for quality measurement of the new beam (sometimes called the new beam reference signal). That is, the reference signal resource set includes at least a reference signal transmitted on the new beam. The new beam is, for example, a beam other than the beam that the base station device 200 is using to transmit a channel or signal to the terminal device 100. The new beam is, for example, a beam that is not the current beam. Also, the new beam is, for example, a beam that is not a candidate beam. The base station device 200 may also transmit information on the beam report settings and TCI status in a single signal. For example, the base station device 200 may transmit information on the beam report settings and TCI status in an RRC signal. Furthermore, the base station device 200 may transmit information regarding beam report settings and TCI status using different signals.

[0024] Furthermore, the reference signal of the current beam may or may not be included in the reference signal resource set included in the beam report settings. Also, if the reference signal of the new beam is CSI-RS, the reference signal of the current beam is also CSI-RS, and if the reference signal of the new beam is SSB, the reference signal of the current beam is also SSB.

[0025] In the following explanation, the reference signals for beam quality measurement (including the reference signal for the new beam, the reference signal for the current beam, and the reference signal for the candidate beam) will be described using CSI-RS as an example.

[0026] <Example of Base Station Device 200 Configuration> Figure 2 shows an example of the configuration of a base station device 200. The base station device 200 includes a CPU (Central Processing Unit) 210, storage 220, memory 230, antenna 240, and wireless communication circuit 250.

[0027] Storage 220 is an auxiliary storage device such as flash memory, HDD (Hard Disk Drive), or SSD (Solid State Drive) that stores programs and data. Storage 220 stores the wireless communication control program 221 and the beam report control program 222.

[0028] Memory 230 is an area for loading programs stored in storage 220. Memory 230 may also be used as an area for programs to store data.

[0029] The wireless communication circuit 250 is a device that communicates wirelessly with the terminal device 100 via the antenna 240. The base station device 200 transmits and receives signals (messages) with the terminal device 100 via the wireless communication circuit 250.

[0030] The CPU 210 is a processor that loads programs stored in the storage 220 into the memory 230, executes the loaded programs, builds each part, and performs each process.

[0031] The CPU 210 constructs the transmitting unit, receiving unit, and control unit by executing the wireless communication control program 221, and performs wireless communication control processing. Wireless communication control processing is the process of controlling wireless communication with the terminal device 100. In the wireless communication control processing, the base station device 200 wirelessly connects with the terminal device 100, transmits signals to the terminal device 100, and receives signals from the terminal device 100.

[0032] The CPU 210 constructs the transmitting unit, receiving unit, and control unit by executing the beam report control program 222, and performs beam report control processing. The beam report control processing involves instructing the terminal device 100 to configure beam report settings and receiving beam reports (measurement results of the reference signal) transmitted from the terminal device 100. The beam report settings include information on what kind of beam report to transmit, such as the resource set of the reference signal to be measured (for example, a resource set including periodic CSI-RS (periodic CSI-RS) resources or SSB) and the type of event trigger conditions (event). The base station device 200 can notify the terminal device 100 of multiple types of beam report settings.

[0033] The base station device 200 instructs the terminal device 100 to generate a beam report that takes into account its processing capacity. The base station device 200 counts the number of reference signal resources and ports being measured simultaneously and instructs the terminal device 100 to measure beams that can be processed within its processing capacity. The base station device 200 also receives the beam report and performs actions such as selecting an appropriate transmit beam for the terminal device 100.

[0034] In the following, the number of reference signal resources or ports measured simultaneously may be referred to as the "measurement count." The measurement count corresponds to the number of reference signal resources or the number of ports. Furthermore, the measurement count of a given reference signal during a predetermined period is counted based on the number of times the reference signal can be measured simultaneously during that period. The predetermined period may, for example, be the period during which the reference signal is active. Alternatively, the predetermined period may be, for example, one slot. Specifically, the predetermined period may be the slot during which the reference signal is transmitted while it is active.

[0035] <Example of Terminal Device 100 Configuration> Figure 3 is a diagram showing an example of the configuration of terminal device 100. Terminal device 100 includes a CPU 110, storage 120, memory 130, antenna 140, and wireless communication circuit 150.

[0036] Storage 120 is an auxiliary storage device such as flash memory, HDD, or SSD that stores programs and data. Storage 120 stores the wireless communication program 121 and the beam report program 122.

[0037] Memory 130 is an area for loading programs stored in storage 120. Memory 130 may also be used as an area for programs to store data.

[0038] The wireless communication circuit 150 is a device that communicates wirelessly with the base station device 200 via the antenna 140. The terminal device 100 transmits and receives signals (messages) with the base station device 200 via the wireless communication circuit 150.

[0039] The CPU 110 constructs a terminal transmission unit, a terminal reception unit, and a terminal control unit by executing the wireless communication program 121, and performs wireless communication processing. Wireless communication processing involves establishing a wireless connection with the base station device 200 and performing wireless communication. In wireless communication processing, the terminal device 100 performs wireless communication with the base station device 200, receives signals transmitted by the base station device 200, and transmits signals to the base station device 200.

[0040] The CPU 110 constructs a terminal transmission unit, a terminal reception unit, and a terminal control unit by executing the beam report program 122, and performs beam report processing. Beam report processing is the process of measuring the beam reference signal according to the instructions of the base station device 200 and transmitting the measurement results as a beam report to the base station device 200. If the instructed beam report includes a beam report triggered by an event, the terminal device 100 transmits the measurement results of the beam reference signal to the base station device 200 if the conditions are met.

[0041] <Beam Report of Event Trigger>Figure 4 is a diagram showing an example of a beam report based on a trigger event. The terminal device 100 monitors reference signals and, for example, measures the reference signals transmitted periodically. In Figure 4, the terminal device 100 measures reference signals R1 to R3. The reference signals R1 to R3 include the reference signals of the new beam and the reference signals of the current beam. The reference signal is, for example, CSI-RS or SSB.

[0042] When an event occurs (when the conditions of the event trigger are satisfied), the terminal device 100 transmits a beam report. In Figure 4, after measuring the reference signal R3, the conditions are satisfied, and the beam report BR1 is transmitted to the base station device 200. The beam report is, for example, a CSI report.

[0043] <Conditions of Event Trigger>The conditions of the event trigger (hereinafter may be simply referred to as conditions) will be described.

[0044] For example, there are the following three patterns of conditions: - Condition 1 (Event 1): The reception quality level of the reference signal of the communication beam (for example, L1-RSRP or L1-SINR) is lower (worse) than the threshold value. - Condition 2 (Event 2): The reception quality level of the reference signal of at least one measured new beam (for example, L1-RSRP or L1-SINR) is higher (better) than the threshold value compared to the reception quality level of the reference signal of the communication beam (for example, L1-RSRP or L1-SINR). - Condition 7 (Event 7): The reception quality level of the reference signal of at least one measured new beam (for example, L1-RSRP or L1-SINR) is higher (better) than the threshold value compared to the reception quality level of the reference signal of the Qth candidate beam. Also, the Qth in Condition 7 indicates the beam with good reception quality of the reference signal among the maximum eight candidate beams.

[0045] The terminal device 100 monitors communication beams under Conditions 1 and 2, and monitors all candidate beams under Condition 7. Therefore, it is preferable for the base station device 200 to count the number of measurements considering the monitoring (measurement, result storage, etc.) of communication beams and candidate beams according to the conditions.

[0046] <Counting Method for Beam Reports of Event Triggers> A counting method for the number of measurements in a beam report including a beam report of an event trigger will be described. FIG. 5 is a diagram showing an example of a flowchart of the counting process. The base station device 200 and the terminal device 100 execute a counting process S10 at a predetermined timing.

[0047] The base station device 200 and the terminal device 100 check whether one or more CSI report settings include beam report settings other than event triggers (for example, a beam report that transmits measurement results using a transmission resource set by the base station device 200) (S10-1). When the base station device 200 and the terminal device 100 include beam report settings other than event triggers (Yes in S10-1), they count the beam reports other than event triggers in the first method (S10-2).

[0048] The first method is, for example, a counting method that does not consider the current beam. The base station device 200 and the terminal device 100 count the CSI-RS resources that are active among the CSI-RS resources included in the reference signal resource set to be measured.

[0049] When the base station device 200 and the terminal device 100 do not include beam report settings other than event triggers in one or more CSI report settings (No in S10-1), they do not perform process S10-2.

[0050] The base station device 200 and the terminal device 100 check whether one or more CSI report settings include beam report settings for event triggers (events 1 and 2) (S10-3). If one or more CSI report settings include beam report settings for event triggers related to communication beams (e.g., events 1 and 2) (Yes in S10-3), the base station device 200 and the terminal device 100 perform a count that takes communication beams into account for the beam report settings of event triggers related to communication beams (S10-4). The counting of communication beams will be described later.

[0051] If the base station device 200 and the terminal device 100 do not include a beam report setting for an event trigger related to the communication beam in one or more CSI report settings (No. in S10-3), they do not perform process S10-4.

[0052] The base station device 200 and the terminal device 100 check whether one or more CSI report settings include beam report settings for event triggers related to candidate beams (e.g., event 7) (S10-5). If one or more CSI report settings include beam report settings for event triggers related to candidate beams (Yes in S10-5), the base station device 200 and the terminal device 100 perform a count considering the candidate beams for the beam report settings of the event triggers related to candidate beams (S10-6). The counting of candidate beams will be described later.

[0053] If the base station device 200 and terminal device 100 do not include a beam report setting for an event trigger related to a candidate beam in one or more CSI report settings (No. in S10-5), they will not perform process S10-6 and will terminate the counting process.

[0054] <Counting Examples> The following explains some counting examples.

[0055] <1. Cases without event-triggered beam report settings> Figure 6 shows an example of a count when event-triggered beam report settings are not included. The beam report settings set by the RRC signal include setting 1 (CSI report setting 1). The reference signal resource set included in setting 1 includes CSI-RS#1 and CSI-RS#2 as measurement targets. #1 and #2 are CSI-RS identifiers. CSI-RS#1 and CSI-RS#2 are periodic CSI-RS. Setting 1 is not an event-triggered beam report setting. Setting 1 is, for example, a periodic, semi-persistent, or aperiodic beam report setting. Figure 6 shows an example of the number of measurements in each period P1 and P2 at the bottom, with the horizontal axis representing time (slots). In the following diagrams, the signals indicate the timing of transmission from the base station device 200, but they can also be considered as the timing of reception by the terminal device 100.

[0056] CSI-RS#1 is active and counted in the measurement count from the time CSI-RS#1 is set as an additional by the RRC signal (S100) until CSI-RS#1 is released by the RRC signal (S102). On the other hand, CSI-RS#2 is active and counted in the measurement count from the time CSI-RS#2 is set as an additional by the RRC signal (S100) until CSI-RS#2 is released by the RRC signal (S101).

[0057] The base station device 200 transmits the settings for CSI-RS#1 and CSI-RS#2, and setting 1, to the terminal device 100 via an RRC signal (S100). The RRC signal may also be RRC Configuration. CSI-RS#1 and CSI-RS#2 each have one port. The base station device 200 transmits the release of the setting for CSI-RS#2 to the terminal device 100 via an RRC signal (S101). CSI-RS#2 is active during the period P1 from setting to release. During period P1, CSI-RS#1 is included in the reference signal resource set included in setting 1, and is therefore considered to have been referenced once by setting 1. The measurement count is counted as one. Similarly, CSI-RS#2 is included in the reference signal resource set included in setting 1, and is therefore counted as one measurement. Therefore, during period P1, the number of reference signal resources measured simultaneously is 2, and the number of ports measured simultaneously is 2. Furthermore, during period P1, the number of measurements may be counted in the respective transmission slots of CSI-RS#1 and CSI-RS#2. The base station device 200 also transmits an RRC signal to the terminal device 100 to release the setting of CSI-RS#1 (S102). CSI-RS#1 is active during periods P1 and P2, from setting to release. During period P2, only the active CSI-RS#1 is counted, and the number of measurements for CSI-RS#1 is counted as 1. Also, during period P2, CSI-RS#2 is inactive, so its measurement count is not counted. Therefore, during period P2, the number of reference signal resources measured simultaneously is 1, and the number of ports measured simultaneously is 1. Furthermore, during period P2, the number of measurements may be counted in the transmission slot of CSI-RS#1.

[0058] <2. Including Event-Triggered Beam Report Settings> Figure 7 shows an example of a count when event-triggered beam report settings are included. The beam report settings set by the RRC signal include setting 1 (CSI report setting 1) and setting 2 (CSI report setting 2). Setting 2 is a beam report setting triggered by an event based on conditions related to the communication beam (e.g., condition 1 or condition 2). Setting 1 is the same as in Figure 6.

[0059] The active status of CSI-RS#1 and CSI-RS#2 is the same as in Figure 6.

[0060] The base station device 200 transmits the settings for CSI-RS#1 and CSI-RS#2, setting 1 and setting 2, to the terminal device 100 using RRC signals (S100). The RRC signal may also be RRC Configuration. CSI-RS#1 and CSI-RS#2 each have one port. The base station device 200 transmits, for example, an instruction to the terminal device 100 regarding the TCI state when receiving a channel or signal, including it in the DCI (S200). In this TCI state, CSI-RS#2 is the source reference signal. This TCI state is referred to as the TCI state of CSI-RS#2. During period P11, from the RRC signal setting to the TCI status indication, the base station device 200 and terminal device 100 are considered to have been referenced once by setting 1 because the communication beam has not been determined and CSI-RS#1 and CSI-RS#2 are included in the reference signal resource set included in setting 1. The number of measurements for CSI-RS#1 is counted as 1, and the number of measurements for CSI-RS#2 is counted as 1. Therefore, during period P11, the number of reference signal resources measured simultaneously is 2, and the number of ports measured simultaneously is 2 ports. Alternatively, the number of measurements may be counted in the transmission slot of CSI-RS#1 during period P11.

[0061] Furthermore, the base station device 200 and the terminal device 100 determine that CSI-RS#2 is the reference signal for the communication beam from the timing at which they apply the TCI state instruction for CSI-RS#2. Also, the base station device 200 and the terminal device 100 transmit to the terminal device 100, for example, a TCI state instruction in DCI where the source reference signal is CSI-RS#1 (S201). The base station device 200 and the terminal device 100 determine that CSI-RS#1 is the reference signal for the communication beam from the timing at which they apply the TCI state instruction for CSI-RS#1. Note that during the period P12 from the TCI state instruction for CSI-RS#2 to the TCI state instruction for CSI-RS#1, the base station device 200 and the terminal device 100 consider CSI-RS#2 to have been referenced once by setting 2 because it is the reference signal for the communication beam of setting 2. Therefore, the number of measurements for CSI-RS#1 is counted as 1, and the number of measurements for CSI-RS#2 is counted as 2. During period P12, the number of reference signal resources measured simultaneously is 3, and the number of ports measured simultaneously is 3. Alternatively, during period P12, the number of measurements may be counted using the transmit slot of CSI-RS#1.

[0062] Furthermore, during period P13, from the indication of the TCI state of CSI-RS#1 to the release of CSI-RS#2, the base station device 200 and the terminal device 100 consider CSI-RS#1 to have been referenced once by setting 2 because it is the reference signal for the communication beam of setting 1. Therefore, the number of measurements for CSI-RS#1 is counted as 2, and the number of measurements for CSI-RS#2 is counted as 1. During period P12, the number of reference signal resources measured simultaneously is 3, and the number of ports measured simultaneously is 3 ports. Alternatively, during period P13, the number of measurements may be counted in the transmit slot of CSI-RS#1.

[0063] Furthermore, the base station device 200 and terminal device 100 count only the active CSI-RS#1 during period P14, from the release of CSI-RS#2 to the release of CSI-RS#1, and count the number of measurements for CSI-RS#1 as 2. Also, since CSI-RS#2 is inactive during period P14, the number of measurements for CSI-RS#2 is not counted. Therefore, during period P14, the number of reference signal resources measured simultaneously is 2, and the number of ports measured simultaneously is 2 ports. Alternatively, the number of measurements may be counted in the transmission slot of CSI-RS#1 during period P14.

[0064] Next, we will explain an example of counting when setting 2 is a beam report setting triggered by an event condition (e.g., condition 7) related to a candidate beam. When setting 2 is a beam report setting triggered by an event condition related to a candidate beam, before S200 shown in Figure 7, for example, the base station device 200 sends an instruction to the terminal device 100 to activate the TCI state. Among the activated TCI states, for example, there is a TCI state in which CSI-RS#1 is the source reference signal. That is, CSI-RS#1 is the reference signal of the candidate beam. The terminal device 100 measures the reference signal of the candidate beam, determines the Qth received quality, and determines whether the event condition (e.g., condition 7) is met. Therefore, the terminal device 100 needs to measure the reference signals of all candidate beams, including CSI-RS#1. The base station device 200 and the terminal device 100 consider that, for example, during the period from the instruction to activate the TCI state of CSI-RS#1 to the instruction to deactivate the TCI state, CSI-RS#1 is the reference signal for the candidate beam in setting 2, and therefore is considered to have been referenced once by setting 2. The number of measurements of CSI-RS#1 is counted as 1. Also, during this period, CSI-RS#1 is included in the reference signal resource set included in setting 1, and therefore is considered to have been referenced once by setting 1. Therefore, the number of measurements of CSI-RS#1 is counted as 2. Thus, during the period from the instruction to activate the TCI state of CSI-RS#1 to the instruction to deactivate the TCI state, the number of reference signal resources measured simultaneously is 2, and the number of ports measured simultaneously is 2 ports. Furthermore, the number of measurements may be counted in the transmission slot of CSI-RS#1 during the period from the instruction to activate the TCI state of CSI-RS#1 to the instruction to deactivate the said TCI state.

[0065] Figure 8 shows another example of counting the number of measurements.

[0066] In events related to communication beams (e.g., events 1 and 2), the active period of the CSI-RS, which is the reference signal for the communication beam, is from the transmission of the DCI including the TCI status indication of the said CSI-RS to the transmission of the DCI including the TCI status indication of another CSI-RS. Alternatively, in events related to communication beams (e.g., events 1 and 2), the active period of the CSI-RS, which is the reference signal for the communication beam, may be from the application of the TCI status indication of the said CSI-RS in the terminal device 100 to the application of the TCI status indication of another CSI-RS. Also, in Figure 8(A), CSI-RS #1 is active as the reference signal for the communication beam from the transmission of the DCI including the TCI status indication of CSI-RS #1 to the transmission of the DCI including the TCI status indication of CSI-RS #2.

[0067] In addition to DCI, RRC / MAC-CE may also be used. In the case of RRC / MAC-CE, only one TCI state is set and activated.

[0068] In an event related to a candidate beam (e.g., event 7), the active period of the CSI-RS, which is the reference signal for the candidate beam, is the period from the transmission of the MAC-CE that activates the TCI state of the CSI-RS to the transmission of the MAC-CE that deactivates it. Alternatively, in an event related to a candidate beam (e.g., event 7), the active period of the CSI-RS, which is the reference signal for the candidate beam, may be the period from applying activation, including the receiving process of the MAC-CE that activates the TCI state of the CSI-RS in the terminal device, until applying deactivation, including the receiving process of the MAC-CE that deactivates it. In Figure 8(B), CSI-RS#1 is active as the reference signal for the candidate beam from the time the TCI state of CSI-RS#1 is activated until the TCI state of CSI-RS#1 is deactivated.

[0069] Returning to Figure 7, the base station device 200 transmits a DCI including a TCI status indication for CSI-RS#2 (S200). Then, the base station device 200 transmits a DCI including a TCI status indication for CSI-RS#1 (S201). The base station device 200 and the terminal device 100 count the active CSI-RSs during the period P12 from the TCI status indication for CSI-RS#2 to the TCI status indication for CSI-RS#1. The base station device 200 and the terminal device 100 determine that CSI-RS#1 is the reference signal for the communication beam and count CSI-RS#2 once as the reference signal for the communication beam corresponding to setting 2. That is, during period 12, the number of measurements for CSI-RS#2 is counted to be a total of 2, with 1 measurement for setting 1 and 1 measurement for setting 2.

[0070] During period P13, from the transmission of DCI including the TCI status indication of CSI-RS#1 until CSI-RS#2 is released (S101), the base station device 200 determines CSI-RS#1 as the reference signal for the communication beam and counts CSI-RS#1 once as the current beam corresponding to setting 2. In other words, during period P13, the number of measurements of CSI-RS#1 is counted as a total of 2, with 1 measurement for setting 1 and 1 measurement for setting 2.

[0071] For period P14, CSI-RS#2 will be released, so the measured value of CSI-RS#2 will be 0.

[0072] As mentioned above, each control information is described based on transmission from the base station device 200, but it may also be interpreted as reception by the terminal device 100. Each period may take into account the time required for beam application (beam formation, transmission and reception, etc.) in the terminal device 100 (delay for beam application) and the processing time of each control information (e.g., DCI or RRC signal).

[0073] In the first embodiment, the base station device 200 can estimate the number of processes at the terminal device 100 more accurately (on the safe side) by counting the number of measurements that take into account the event-triggered beam report, and can set the beam report within the processing capacity.

[0074] [Other Embodiments] Figure 9 shows an example of how the counting method for event triggers related to communication beams (e.g., condition 1, condition 2) in the beam report is reflected in the specification. The underlined portion is added to specification TS 38.214 clause 5.2.1.6.

[0075] Figure 10 shows an example of how the counting method for event triggers (e.g., condition 7) related to candidate beams is reflected in the specification. The underlined section is added to specification TS 38.214 clause 5.2.1.6.

[0076] Furthermore, in the UE capability reported by the terminal device 100, the following number of CSI-RS resources and ports (corresponding to the number of measurements) that can be simultaneously supported are considered.

[0077] Item 1: Included in the reference signal resource set included in the CSI report settings. Item 2: The source reference signal is the specified TCI state / activated TCI state. For terminal devices that do not support event-triggered beam reporting, only Item 1 needs to be considered. For example, for terminal devices that support event-triggered beam reporting, both Item 1 and Item 2 should be considered.

[0078] Examples of reporting parameters for the number of CSI-RS resources / ports that can be supported simultaneously are shown below: • Supported max number simultaneous NZP-CSI-RS resources in active BWPs across all CCs • Supported max number simultaneous NZP-CSI-RS resources per CC • Supported max total number of CSI-RS ports in simultaneous NZP-CSI-RS resources in active BWPs across all CCs • Supported max total number of CSI-RS ports in simultaneous NZP-CSI-RS resources per CC

[0079] 10: Wireless communication system 100: Terminal device 110: CPU 120: Storage 121: Wireless communication program 122: Beam report program 130: Memory 140: Antenna 150: Wireless communication circuit 200: Base station device 210: CPU 220: Storage 221: Wireless communication control program 222: Beam report control program 230: Memory 240: Antenna 250: Wireless communication circuit

Claims

1. A base station device comprising: a receiving unit that receives event trigger beam reports transmitted from a terminal device when predetermined conditions are met; a transmitting unit that transmits beam report setting information relating to the beam reports to the terminal device; and a control unit that counts the number of reference signal resources and ports simultaneously measured by the terminal device according to the predetermined conditions.

2. The base station device according to claim 1, wherein the transmitting unit transmits a first instruction relating to the TCI state to the terminal device, the first instruction being an instruction to activate the TCI state, and the TCI state being the TCI state when the terminal device receives a channel or signal.

3. The base station device according to claim 1, wherein the transmitting unit transmits a second instruction regarding the TCI state to the terminal device, and the control unit, when the predetermined condition is the first condition, counts the number of reference signal resources and ports to be measured simultaneously in accordance with the second instruction regarding the TCI state.

4. The base station device according to claim 2, wherein the reference signal resource is a first reference signal corresponding to a second instruction regarding the TCI state in the terminal device.

5. The base station device according to claim 4, wherein the control unit determines and counts that the terminal device is active from the time of receiving the second instruction regarding the TCI state to the time of receiving the second instruction regarding the TCI state of a signal other than the first reference signal.

6. The base station device according to claim 1, wherein the transmitting unit transmits a first instruction regarding the TCI status to the terminal device, and the control unit, when the predetermined condition is a second condition, counts the number of reference signal resources and ports to be measured simultaneously during a predetermined period in accordance with the first instruction.

7. The base station device according to claim 6, wherein the reference signal resource is a second reference signal corresponding to the first instruction in the terminal device.

8. The base station device according to claim 7, wherein the control unit determines and counts that the terminal device is active from the time of receiving the first instruction until the time of receiving the instruction to deactivate the second reference signal.

9. A terminal device comprising: a terminal transmission unit that transmits an event-triggered beam report to a base station device when predetermined conditions are met; a terminal reception unit that receives beam report setting information related to the beam report from the base station device; and a control unit that counts the number of reference signal resources and ports to be measured simultaneously according to the predetermined conditions, wherein the beam report setting information is generated in the terminal device according to the number of reference signal resources and ports that can be measured simultaneously as UE Capability in the terminal device.

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