Base station equipment, terminal equipment, control method, and program for efficient measurement of wireless quality

Abstract

To appropriately control the execution timing of a terminal device's measurement of interference between uplink and downlink.SOLUTION: A base station device notifies a first terminal device of setting information for measuring the first quality of an uplink signal that interferes with a downlink signal received by the first terminal device and transmitted by a second terminal device by layer 3 signaling, and transmits an instruction to perform the first quality measurement on the basis of the setting information or to stop the measurement in progress to the first terminal device by layer 1 or layer 2 signaling.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a technique for improving the efficiency of measurement of uplink signals and downlink signals.

Background Art

[0002] In a cellular communication system, in order to use radio resources flexibly, the adoption of time division duplex (TDD) is being promoted. In TDD, time slots are allocated to the uplink in which signals are transmitted from a terminal device to a base station device and the downlink in which signals are transmitted from the base station device to the terminal device, respectively. In TDD, efficient communication can be achieved by flexibly setting the amount allocated to the uplink or the downlink according to the data amounts of the uplink and the downlink.

[0003] On the other hand, when such flexible settings are used, for example, between cells adjacent to each other, an uplink signal transmitted from a terminal device may interfere with a downlink signal received by another terminal device. Also, a downlink signal transmitted from a base station device may interfere with an uplink signal received by another base station device. Such interference may be called cross-link interference (CLI). Also, it is assumed that common time slots are allocated to the uplink and the downlink, respectively, in two adjacent frequency resources within one cell. In this case, similar interference may occur. Thus, since interference may occur by performing flexible control, it is important to reduce the influence of such interference. Non-Patent Document 1 describes that, for cooperative operation between base station devices for reducing CLI, a terminal device measures the magnitude of CLI and reports it to the base station device.

Prior Art Documents

Non-Patent Documents

[0004] <00*00020>

Non-Patent Document 1

Summary of the Invention

[0005] When measuring interference between uplink and downlink, it is necessary to control the communication of the uplink or downlink on the resource where interference is expected to occur. On the other hand, in the method described in Non-Patent Document 1, the start and end of the measurement are indicated by Layer 3 signaling. As a result, for example, the period from when the situation requiring interference measurement arises until the measurement begins can be prolonged, and measurements may be performed for an unnecessarily long period of time. [Means for solving the problem]

[0006] This invention provides a technique for appropriately controlling the timing of measurement of interference between an uplink and a downlink by a terminal device.

[0007] A base station device according to one aspect of the present invention includes a notification means that notifies the first terminal device by Layer 3 signaling of setting information for measuring the first quality of an uplink signal, which interferes with the downlink signal received by the first terminal device and is transmitted by the second terminal device, and a means that instructs the first terminal device to perform the measurement of the first quality based on the setting information. Go An instruction means that transmits instructions to do so by signaling at Layer 1 or Layer 2, Receiving means for receiving the measurement results by the first terminal device and to have Furthermore, the notification means notifies the first terminal device, via Layer 3 signaling, of information instructing the first terminal device whether the measurement results should be transmitted as a Layer 1, Layer 2, or Layer 3 message. .

[0008] A terminal device according to one aspect of the present invention includes a setting means for setting the first quality measurement of an uplink signal, which interferes with the downlink signal received by the terminal device and is transmitted by a second terminal device, when the terminal device receives a downlink signal from a base station device to which it is connected, by receiving setting information for measuring the first quality of the uplink signal from the base station device via Layer 3 signaling, and a setting means for setting the first quality measurement from the base station device ExecuteBy receiving instructions to do so via Layer 1 or Layer 2 signaling, Based on the aforementioned configuration information A measuring means that performs the measurement, Based on the instructions received from the base station device via the Layer 3 signaling, The results of the above measurement In a message from Layer 1, Layer 2, or Layer 3 It includes a notification means for notifying the base station device. [Effects of the Invention]

[0009] According to the present invention, the timing of the measurement of interference between the uplink and downlink by the terminal device can be appropriately controlled. [Brief explanation of the drawing]

[0010] [Figure 1] This diagram shows an example of a wireless communication network configuration. [Figure 2] This figure shows an example of the device's hardware configuration. [Figure 3] This figure shows an example of the functional configuration of a base station device. [Figure 4] This figure shows an example of the functional configuration of a terminal device. [Figure 5] This diagram shows an example of the processing flow performed in a wireless communication network. [Modes for carrying out the invention]

[0011] The embodiments will be described in detail below with reference to the attached drawings. Note that the following embodiments do not limit the invention as defined in the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more of the features described in the embodiments may be combined in any way. Furthermore, identical or similar configurations will be given the same reference numeral, and redundant descriptions will be omitted.

[0012] (System Configuration) Figure 1 shows an example configuration of a wireless communication system according to this embodiment. The wireless communication system may be, for example, a wireless communication system compliant with the 5th generation (5G) cellular communication standard of the 3rd Generation Partnership Project (3GPP®). The wireless communication system includes, for example, base station equipment 101 and base station equipment 102, and terminal equipment 111 and terminal equipment 112. In one example, terminal equipment 111 establishes a connection with base station equipment 101 and communicates, and terminal equipment 112 establishes a connection with base station equipment 102 and communicates. This is just an example, and for example, both terminal equipment 111 and terminal equipment 112 may connect to base station equipment 101 and communicate. In Figure 1, two base station equipment and two terminal equipment are shown for simplicity of explanation, but the wireless communication system may include many base station equipment and many terminal equipment without loss of generality.

[0013] In this embodiment, flexible resource allocation is performed such that uplink and downlink communications coexist within a single time slot of a single frequency band. For example, at the same time that base station 101 allocates uplink resources to terminal 111, base station 102 may allocate downlink resources to terminal 112. In such a case, the uplink signal transmitted from terminal 111 may interfere with the downlink signal received by terminal 112. If terminal 111 is located close to terminal 112, this interference may be received by terminal 112 with very high received power. At the location of terminal 112, the timing of the frames may be significantly different between the timing of receiving the downlink signal and the timing of receiving the uplink signal transmitted from terminal 111. In this case, even if different frequency resources are used for the uplink and downlink, the orthogonality of the signals cannot be guaranteed, and interference may not be able to be ignored. Therefore, in situations where such interference exists, it may be impossible for terminal 112 to communicate. Furthermore, the downlink signal transmitted from the base station device 102 may interfere with the uplink signal transmitted from the terminal device 111 at the location of the base station device 101. However, this interference can be suppressed to a sufficiently low level, for example, by positioning the base station device 101 and the base station device 102 at a sufficiently far distance apart, and by controlling the direction (tilt angle) of the radio waves transmitted from the base station device 102.

[0014] Therefore, in this embodiment, the description will focus on the situation where the uplink signal transmitted from the terminal device 111 interferes with the downlink signal transmitted to the terminal device 112. Note that the following discussion can also be applied when both the terminal device 111 and the terminal device 112 are connected to the base station device 101 for communication. That is, when the base station device 101 transmits a downlink signal using some of the frequency resources in the available frequency band for the terminal device 112 and at the same time causes the terminal device 111 to transmit an uplink signal using another part of the frequency resources within the available frequency band, the processes described below can be applied. In the example of FIG. 1, an example is shown where the uplink signal transmitted by the terminal device 111 interferes with the downlink signal addressed to the terminal device 112. However, it is also natural that the uplink signal transmitted by the terminal device 112 interferes with the downlink signal addressed to the terminal device 111. For this reason, hereinafter, when there is no particular need for distinction, the description of the reference signs may be omitted, and the terminal device 111 and the terminal device 112 may be referred to as "terminal devices".

[0015] To address the interference between the uplink signal and the downlink signal between terminal devices, it is assumed that the terminal device observes the surrounding environment and, after confirming that the impact of interference between terminal devices is low, allocates uplink resources. For example, the terminal device 112 measures the uplink signal transmitted by the terminal device 111, and the terminal device 111 measures the downlink signal received by the terminal device 112 and others, and resource allocation control is performed based on the measurement results. The terminal device detects surrounding radio signals and measures the received signal strength indicator (RSSI), reference signal received power (RSRP), reference signal received quality (RSRQ), signal-to-noise ratio (SNR), and signal-to-interference and noise ratio (SINR). The terminal device can, for example, measure the surrounding uplink signal while the downlink signal is not being transmitted, and measure the surrounding downlink signal while the uplink signal is not being transmitted.

[0016] A terminal device measures, for example, the RSRP of the Sounding Reference Signal (SRS) transmitted by surrounding terminal devices as an uplink signal, and the RSSI of SRS and other signals, and notifies the connected base station device of the measured results (SRS-RSRP, CLI-RSSI). Here, CLI-RSSI is a value indicating the magnitude of crosslink interference (CLI). This measurement can be performed mainly by terminal devices that may be affected by uplink signals from surrounding terminal devices. Note that when a terminal device performs uplink communication that may cause interference to downlink communication, it is configured to transmit SRS by the control of the base station device. Here, a terminal device that transmits SRS does not have to transmit uplink signals transmitted by other terminal devices. Also, a terminal device that transmits SRS may measure SRS and other signals transmitted by other terminal devices in a frequency band other than the frequency band in which it transmits its own SRS and other signals, or during periods when it is not transmitting its own SRS and other signals. Furthermore, the terminal device may use the RSSI for the entire available frequency band as a measurement result for the uplink signal while no downlink signal is being transmitted. The terminal device may also receive information from the base station device indicating the frequency resources allocated to the uplink in its vicinity and perform measurements based on that information.

[0017] Furthermore, the terminal device can measure, for example, RSRP, SINR, RSSI, etc., of channel status information (CSI)-reference signals (RS) and synchronization signals (SS) transmitted by surrounding base station devices as signals of the surrounding downlink. The terminal device then notifies the connected base station device of the measured results (CSI-RSRP / SINR / RSSI, SS-RSRP / SINR / RSSI, etc.). The terminal device may also measure the RSSI of other signals. For example, the terminal device may measure the RSRP and SINR of CSI-RS and SS in the frequency band in which they are transmitted, and measure the RSSI in the frequency band in which CSI-RS and SS are not transmitted. Regarding downlink signals, the measurement may be configured to be performed by a terminal device that transmits uplink signals that may interfere with downlink communication. However, this is not limited to this, and the measurement may be performed by a terminal device that may be affected by uplink signals from surrounding terminal devices.

[0018] In 5G, multiple Bandwidth Parts (BWPs) can be configured for a terminal device. The terminal device can perform measurements only in the frequency band within the active BWP among the multiple BWPs. Therefore, when multiple BWPs are configured, the terminal device can select the BWP to be made active so that the frequency region to be measured is included within the range of the configured BWP, and perform measurements. Also, when the terminal device switches and uses multiple BWPs at predetermined time intervals, the terminal device may select the period during which the BWP capable of interference measurement is active and measure interference in that BWP. Note that if the terminal device cannot perform measurements on the frequency region to be measured in any of the configured BWPs, it can refrain from performing measurements. Note that if the terminal device receives from the base station device a configuration in which none of the configured BWPs includes the frequency region to be measured, it may discard that configuration. Also, in that case, the terminal device may notify the base station device that none of the configured BWPs includes the frequency region to be measured or that the configuration has been discarded. Also, the base station device may, for example, reconfigure the BWP so that such a configuration is not made.

[0019] The base station equipment can receive the measurement results from the terminal equipment and, based on those measurement results, can determine, for example, the allocation of uplink resources. For example, if the reception quality of the downlink signal at the terminal equipment to which uplink resources are to be allocated is sufficiently high, above a predetermined value, it is considered to have a certain degree of resistance to interference. In such cases, the base station equipment can determine that downlink communication is possible even if there is uplink interference and allocate uplink resources to the terminal equipment from which the measurement results were obtained. On the other hand, if the reception quality of the downlink signal at the terminal equipment to which uplink resources are to be allocated is below a predetermined value, the base station equipment can choose not to allocate uplink resources to the terminal equipment from which the measurement results were obtained. Furthermore, for example, the base station equipment can determine the allocation of downlink resources based on the measurement results from the terminal equipment. For example, for terminal equipment whose uplink signal strength or quality is sufficiently low, below a predetermined value, it is assumed that downlink communication is possible without significant interference from the uplink signal. That is, for a first terminal equipment with sufficiently low uplink signal reception power, it is assumed that there are no second terminal equipment communicating on the uplink in the vicinity. Therefore, even if an uplink resource is allocated to a second terminal device in the same time slot as the downlink resource allocated to the first terminal device, the effects of interference can be sufficiently suppressed. For this reason, the base station equipment can allocate downlink resources to terminal devices that have obtained such measurement values. Furthermore, the base station equipment to which a terminal device that transmitted an uplink signal is connected can allocate uplink resources to that terminal device in the same time slot as the resources it transmitted. In this case, if the terminal device that receives the downlink signal and the terminal device that transmits the uplink signal are connected to the same base station equipment, that base station equipment can perform both uplink and downlink allocation. On the other hand, if the terminal device that receives the downlink signal and the terminal device that transmits the uplink signal are connected to different base station equipment, the measurement results can be shared between the base station equipment to which each terminal device is connected, and resource allocation can be performed based on those measurement results.Furthermore, one of the base station devices to which each of these terminal devices is connected may determine whether or not resources can be allocated, and a portion of the result of that determination may be notified to the other base station device. In this case, the base station device that determines whether or not resources can be allocated may be provided with measurement results from the other base station device. The base station device that determines whether or not resources can be allocated may be the base station device to which a terminal device requiring uplink resources is connected, or it may be the base station device to which a terminal device receiving downlink signals is connected. In addition, the allocation of resources may be determined by other base station devices or other network nodes. Note that only the allocation of uplink resources may be determined, and downlink resources may be assumed to be available by default. Similarly, only the allocation of downlink resources may be determined, and uplink resources may be assumed to be available by default. Note that these resource allocations may be performed according to various criteria, but will not be explained in further detail here.

[0020] The base station equipment is configured to notify terminal equipment of settings necessary for the terminal equipment to perform the measurements described above. For example, the base station equipment may notify terminal equipment performing uplink communication of settings information for measuring the radio quality of downlink signals in resource blocks that may be interfered with by the uplink communication. For example, the base station equipment notifies the terminal equipment of settings information specifying a frequency resource to measure the radio quality of the downlink in that resource block. If CSI-RS or SS is transmitted in that resource block, information indicating the location and sequence of the CSI-RS or SS may also be notified to the terminal equipment as settings information. The settings information may also include information indicating the type of radio quality to be measured, such as RSSI, RSRP, or SINR. Furthermore, the base station equipment may also notify terminal equipment that may perform downlink communication in that resource block of settings information for measuring the radio quality of uplink signals transmitted by terminal equipment performing uplink communication. In this case, the settings information may include, for example, information indicating the frequency range to be measured, which is the resource element from which the uplink communication terminal equipment transmits signals. For example, configuration information may include the location of the resource element from which the uplink communication terminal transmits the SRS, and information about the sequence used to generate the SRS.

[0021] Furthermore, the base station equipment can notify terminal equipment of its configuration information through Layer 3 (e.g., the Radio Resource Control (RRC) layer) signaling. The base station equipment can transmit the above configuration information, for example, via the RRCReconfiguration message. The RRCReconfiguration message includes a MeasObjectCLI information element that defines the measurement target for the CLI. In this MeasObjectCLI information element, rssi-ResourceConfig-r16 can specify the frequency position of the physical resource block to be measured. This information can also be used to notify terminal equipment of information regarding the timing of the measurement, such as the measurement period and measurement cycle. For example, configuration information for measuring downlink signals can be notified to terminal equipment. Also, in the MeasObjectCLI information element, srs-ResourceConfig-r16 can be used to notify terminal equipment of the SRS configuration information to be measured. For example, configuration information for measuring uplink signals can be notified to terminal equipment.

[0022] The above-described settings can be applied, for example, when a terminal device transmitting an uplink signal and a terminal device receiving a downlink signal are connected to the same base station device. If a terminal device transmitting an uplink signal and a terminal device receiving a downlink signal are connected to different base station devices, in addition to the above, setting information for measurement in adjacent cells may be notified to the terminal devices. In this case, the base station device may, for example, notify the terminal device performing uplink communication of information that enables the measurement of synchronization signals and broadcast signals (SSB) transmitted in the cell to which the terminal device performing downlink communication is connected. This information may also be provided when the base station device providing the cell to which the uplink signal transmitting terminal device is connected and the base station device providing the cell to which the downlink signal receiving terminal device is connected are provided by different telecommunications carriers. As this setting information for measurement, information about the frequency channel to which the SSB is transmitted may be transmitted. This frequency channel information may be indicated, for example, by the Global Synchronization Channel Number (GSCN). The terminal device can perform SSB measurements based on its configuration information and identify and report to the base station device information such as the location within the frequency channel where the SSB was transmitted, the transmission timing of the SSB, and radio quality information such as received signal strength, RSRP, and RSRQ. The terminal device may also report the frequency location of the SSB to the base station device using the GSCN or NR Absolute Radio Frequency Channel Number (NR-ARFCN). If the base station device knows the frequency location where SSB from another base station device using a frequency channel adjacent to the frequency channel it is using is transmitted, it may send configuration information specifying that frequency location to the terminal device. This frequency location may be notified, for example, by the NR-ARFCN. The base station device may also notify the terminal device of the Measurement Gap, which is the period during which SSB on an adjacent channel is measured without transmitting or receiving data with the base station device.

[0023] Here, for example, a base station device allocates uplink and downlink resources to terminal devices connected to it using a common time slot within a single frequency band. The resources allocated to the uplink and downlink are separated in the frequency domain, but the environment is such that uplink signals can interfere with downlink signals. In this case, the base station device can, at its own discretion, stop transmitting downlink signals to measure uplink measurements, and vice versa. Therefore, the base station device retains information such as the location and sequence of resource elements from which uplink SRS signals are transmitted, and the locations from which downlink CSI-RS, SS, or other signals are transmitted. Consequently, when the base station device wants a terminal device connected to it to measure the effects of interference within its network, it can notify the terminal device of the information it holds. On the other hand, a base station device does not hold information such as the transmission location of SRS transmitted by terminal devices connected to other base station devices, or CSI-RS, SS, or other signals transmitted by other base station devices. Therefore, in this embodiment, a base station device can exchange information for measurement with other base station devices before generating the aforementioned setting information for measurement.

[0024] For example, a base station connected to a terminal device that transmits an uplink signal (a terminal device that may cause interference) provides other base station devices with information regarding the transmission of that uplink signal. For example, information indicating that a portion of the frequency range of a downlink time slot is allocated to the uplink is transmitted to other base station devices. It may also be notified that a time slot previously allocated to the downlink has been reallocated to an uplink time slot. Furthermore, information indicating the frequency range (physical resource block) in which the signal is transmitted on the uplink, and SRS information transmitted by a terminal device communicating on the resources allocated to that uplink (such as the resource elements transmitted and the sequences used to generate the SRS) may be notified to other base station devices. Upon receiving this notification, other base station devices may instruct terminal devices that may be affected by the uplink signal to perform measurements of the uplink signal based on the notified information. For example, another base station device may specify the frequency range in which the interfering uplink signal may be transmitted and instruct a terminal device connected to it to perform RSSI measurements within that frequency range. Furthermore, other base station equipment may notify connected terminal equipment of the resources from which SRS is transmitted and the sequence used to generate that SRS, and instruct the terminal equipment to measure the RSRP of the SRS, etc.

[0025] Furthermore, a base station that transmits a downlink signal that may be interfered with by an uplink signal from a terminal device connected to another base station can notify other base station devices from which the interfering uplink signal may be transmitted of the CSI-RS and SS information it is transmitting. In addition, a base station can notify other base station devices of information indicating resources (e.g., physical resource blocks) that it plans to allocate to a terminal device connected to it, where interference is expected to occur due to an uplink signal in a cell provided by that other base station device. The other base station device can generate measurement configuration information to notify the terminal device to perform measurements on these resources.

[0026] Conventionally, in addition to notifying terminal devices of the configuration information described above, base station equipment also notified terminal devices of the start and end of measurements via Layer 3 signaling. When the start and end of measurements are notified via Layer 3 signaling, it is not possible to start and end measurements in a timely manner. For example, the time between interference between the uplink signal and the downlink signal and the start of measurement may become long. Also, if the transmission of the downlink signal is stopped when the uplink signal is measured, and the transmission of the uplink signal is stopped when the downlink signal is measured, if the measurement cannot be stopped in a timely manner, the transmission of downlink and uplink signals may be unnecessarily stopped, which can reduce frequency utilization efficiency. Furthermore, if Layer 3 signaling is performed each time a measurement is required, the overhead of that signaling can reduce frequency utilization efficiency. Furthermore, environments where two adjacent cells have different TDD configurations may include situations where uplinks or downlinks are used for very short periods (momentarily), such as when a portion of the uplink time slot is dynamically used as a downlink, or vice versa. In such environments, if the start and end of measurements are indicated by Layer 3 signaling, it is conceivable that the necessary interference measurements cannot be performed in real time due to the long period between the conditions requiring interference measurement and the start of the measurement.

[0027] Therefore, in this embodiment, the base station device issues instructions to start and end measurements by Layer 1 or Layer 2 signaling. For example, the base station device may transmit instructions to start and end measurements by Layer 1 signaling using downlink control information (DCI) included in the physical downlink control channel (PDCCH). Alternatively, the base station device may transmit instructions to start and end measurements by Layer 2 signaling using the downlink medium access control element (DL MAC CE).

[0028] The terminal device initiates measurement based on configuration information previously notified via Layer 3 signaling, triggered by Layer 1 or Layer 2 signaling that instructs the start of measurement. The terminal device then notifies the base station device of the measurement results. The terminal device may, for example, notify the measurement results using a Layer 3 message, such as Measurement Report, as in the conventional method. However, it is not limited to this; the terminal device may also transmit the measurement results to the connected base station device using Layer 1 uplink control information (UCI) or Layer 2 uplink MAC CE (UL MAC CE). In one example, the base station device may prepare a resource for a physical uplink control channel for UCI containing the measurement results in advance and notify the terminal device of that resource.

[0029] Furthermore, terminal devices may dynamically switch between reporting at Layer 1 or Layer 2 and reporting at Layer 3. For example, a terminal device receiving a downlink signal may report the measurement result at Layer 1 or Layer 2 if the measured value of the uplink signal is above a predetermined value, and report the measurement result at Layer 3 if the measured value is below the predetermined value. Similarly, a terminal device transmitting an uplink signal may report the measurement result at Layer 1 or Layer 2 if the measured value of the downlink signal is below a predetermined value, and report the measurement result at Layer 3 if the measured value is above the predetermined value. The base station device may notify terminal devices of information indicating predetermined values ​​for determining whether to switch messages during reporting. Note that the first predetermined value for determining whether to switch to reporting at Layer 1 or Layer 2 while reporting at Layer 3, and the second predetermined value for determining whether to switch to reporting at Layer 3 while reporting at Layer 1 or Layer 2, may be the same value or different values. In the example described above, we explained how to determine whether a report is made using Layer 3 or another method (Layer 1 or Layer 2). However, it may be further determined which Layer 1 or Layer 2 message should be used for reporting. The base station device may further notify the terminal device of a predetermined value for this determination.

[0030] Furthermore, the base station device may notify the terminal device whether or not to report the measurement results using any of the Layer 1 to Layer 3 messages. This notification may be made, for example, by a Layer 3 message. The base station device may send this notification to the terminal device, for example, along with the configuration information described above. The base station device may also notify the terminal device to report using a Layer 1 or Layer 2 message if it determines that a predetermined event has occurred based on a Layer 3 message, such as a Measurement Report. For example, the base station device may notify the terminal device receiving the downlink signal to report the measurement results using a Layer 1 or Layer 2 message if the measured value of the uplink signal reported by the terminal device receiving the downlink signal in a Layer 3 message is above a predetermined value. The base station device may also notify the terminal device transmitting the uplink signal to report the measurement results using a Layer 1 or Layer 2 message if the measured value of the downlink signal reported by the terminal device transmitting the uplink signal in a Layer 3 message is below a predetermined value. Furthermore, the base station equipment may notify terminal devices as events if the measured value of the uplink signal at the terminal receiving the downlink signal is above a predetermined value, or if the measured value of the downlink signal at the terminal transmitting the uplink signal is below a predetermined value. When the base station equipment receives a report of the measured value due to such an event via a Layer 3 message, it may instruct the terminal sending the report to report the measurement result via a Layer 1 or Layer 2 message.

[0031] Although Layer 3 messages are inferior to Layer 1 and Layer 2 messages in terms of real-time capabilities, they can report measurement results in detail. Taking advantage of this characteristic, terminal devices may perform detailed reporting in Layer 3 messages, and in Layer 1 or Layer 2 messages, transmit reduced information, such as the difference between the measurement value notified in the Layer 3 message and the measurement value to be reported. Alternatively, when reporting measurement values ​​in Layer 1 or Layer 2 messages, terminal devices may transmit the difference between the measurement value previously transmitted in any of the Layer 1-3 messages and the measurement value to be reported. Furthermore, when reporting measurement values ​​in Layer 1 or Layer 2 messages, terminal devices may only notify the base station device of information indicating whether the measurement value is above a predetermined value.

[0032] For example, a terminal device may notify the base station device of information indicating what kind of measurement the measured value represents, as measurement result information. That is, information such as whether the measured value is the result of measuring SRS-RSRP on the uplink, the RSSI on the uplink, or the SS or CSI-RS on the downlink may be notified to the base station device as measurement result information. This information may be notified as a resource indicator. Furthermore, when information on the measurement result of the uplink is notified using UCI, the information may be transmitted using a UCI format that is an extension of the format used for notifying conventional CSI-RS and SSB measurement results. In that case, a resource indicator indicating SRS-RSRP or RSSI may be included in the UCI instead of the conventional resource indicator indicating CSI-RS or SSB. In this case, a field with the necessary number of bits to uniquely identify the type of measurement is reserved as a field for the resource indicator. In addition, a field for storing the measured value of RSSI or SRS-RSRP may be reserved as, for example, 7 bits, and the measurement result may be transmitted using the field specified in the existing format. Furthermore, to reduce overhead, the difference value of the measurement result from the previous measurement may be transmitted using a field, for example, 4 bits, which stores the difference value from the previous measurement, etc., and does not exist in the existing format. Alternatively, a UCI including a 1-bit field indicating whether the measurement value is greater than or equal to a predetermined value may be transmitted to the base station equipment. Note that which of these formats should be used may be dynamically switched. In this case, for example, which of these formats to use may be specified by an instruction from the base station equipment.

[0033] Furthermore, when starting a measurement using Layer 1 or Layer 2 signaling, the timing of the measurement may also be indicated using Layer 1 or Layer 2 signaling. For example, the measurement timing may be specified by an offset and duration from the timing indicated by the frame or symbol that receives the Layer 1 or Layer 2 measurement start signal. The offset and duration may be dynamically indicated by Layer 1 or Layer 2 signaling. Here, the set of parameters to be actually applied may be indicated by Layer 1 or Layer 2 signaling from one or more sets of offset and duration parameters set by Layer 3 signaling. Alternatively, statically predetermined fixed values ​​may be used as the offset and duration.

[0034] As described above, measurements to evaluate interference between the uplink and downlink are transmitted and received using Layer 3 signaling for their configuration information, and then measurements using that configuration information are started or stopped using Layer 1 or Layer 2 signaling. This ensures that measurements are performed in a timely manner, allowing for appropriate measurements while suppressing a decrease in frequency utilization efficiency. Furthermore, by performing measurements appropriately, it becomes possible to flexibly allocate resources and communicate while suppressing interference between uplink and downlink communications.

[0035] (Device configuration) Figure 2 illustrates an example of the hardware configuration of a base station device and a terminal device. In one example, the base station device and terminal device consist of a processor 201, ROM 202, RAM 203, storage device 204, and communication circuit 205. The processor 201 is a computer consisting of one or more processing circuits, such as a general-purpose CPU (Central Processing Unit) or ASIC (Application-Specific Integrated Circuit), and executes the overall processing of the device and the aforementioned processing by reading and executing programs stored in ROM 202 and storage device 204. ROM 202 is a read-only memory that stores information such as programs and various parameters related to the processing performed by the base station device and terminal device. RAM 203 functions as a workspace when the processor 201 executes programs and is a random-access memory that stores temporary information. Storage device 204 consists of, for example, a removable external storage device. Communication circuit 205 consists of, for example, a circuit for wireless communication of 5G or its successor standards. Although Figure 2 shows one communication circuit 205, a base station device and a terminal device may have two or more communication circuits. Furthermore, a base station device and a terminal device may have a common antenna for wireless communication circuits for 5G and its successor standards. The base station device and terminal device may also have separate antennas for 5G and its successor standards. The terminal device may also have communication circuits for other wireless communication networks such as Wi-Fi. The base station device and terminal device may have separate communication circuits for each of the multiple usable frequency bands, or they may have a common communication circuit for at least a portion of those frequency bands. In this embodiment, the terminal device is assumed to have multiple communication circuits capable of communicating in a common frequency band. The base station device may also have wired communication circuits used when communicating with other base station devices or nodes in the core network.

[0036] Figure 3 shows an example of the functional configuration of a base station device. The base station device has, for example, a setting notification unit 301, a measurement execution instruction unit 302, a measurement result receiving unit 303, and an information exchange unit 304. Note that Figure 3 shows only the functions particularly relevant to this embodiment, and various other functions that the base station device may have are omitted from the illustration. For example, the base station device naturally has other functions that 5G and subsequent standard base station devices generally have. Also, the functional blocks in Figure 3 are shown schematically, and each functional block may be implemented as an integrated unit or further subdivided. Furthermore, each function in Figure 3 may be implemented, for example, by the processor 201 executing a program stored in the ROM 202 or storage device 204, or by a processor located inside the communication circuit 205 executing predetermined software. Note that the details of the processing performed by each functional unit will not be explained in detail here, and only the general functions will be outlined.

[0037] The configuration notification unit 301 notifies the connected terminal device of configuration information for measurement to evaluate the effect of interference from the uplink signal to the downlink signal, using Layer 3 (e.g., RRC layer) signaling. For example, if the connected first terminal device is the device that is interfered with by the uplink signal transmitted from the second terminal device, the configuration notification unit 301 notifies the first terminal device of configuration information for measuring the uplink signal transmitted from the second terminal device. Also, for example, if the connected first terminal device is the device that transmits a signal that interferes with the downlink signal destined for the second terminal device, the configuration notification unit 301 notifies the first terminal device of configuration information for measuring the quality of the resource from which the downlink signal to the second terminal device may be transmitted. As the details of the configuration information are as described above, a detailed explanation is omitted here.

[0038] The measurement execution instruction unit 302 transmits instructions to start and end wireless quality measurements based on the setting information to terminal devices that have been notified of the setting information by the setting notification unit 301, via Layer 1 or Layer 2 signaling. The measurement result receiving unit 303 receives the measurement results from terminal devices that have been instructed to perform measurements by the measurement execution instruction unit 302. The measurement result receiving unit 303 receives the measurement result information, for example, by the type of message instructed to the terminal device by the setting notification unit 301, or by a message determined by the terminal device based on predetermined value information notified to the terminal device by the setting notification unit 301 to determine the type of message.

[0039] The information exchange unit 304 exchanges information with other base station devices for determining measurement settings and information on measurement results. For example, if the first terminal device being connected is the device that is being interfered with by an uplink signal transmitted from a second terminal device connected to another base station device, the information exchange unit 304 may receive information about the SRS transmitted by the second terminal device from the other base station device. In this case, the information exchange unit 304 may also provide the other base station device with information about downlink resources that can be allocated to the first terminal device. Furthermore, if the first terminal device being connected is the device that transmits a signal that interferes with the downlink signal destined for the second terminal device, the information exchange unit 304 may also provide the other base station device with information about the SRS transmitted by the first terminal device. In this case, the information exchange unit 304 may also receive information about downlink resources that can be allocated to the second terminal device from the other base station device.

[0040] Figure 4 shows an example of the functional configuration of a terminal device. The terminal device has, for example, a setting receiving unit 401, a measurement instruction receiving unit 402, a measurement unit 403, and a measurement result notification unit 404. Note that Figure 4 shows only the functions particularly relevant to this embodiment, and various other functions that the terminal device may have are omitted from the illustration. For example, the terminal device naturally has other functions that terminal devices of 5G and its successor standards generally have. Also, the functional blocks in Figure 4 are shown schematically, and each functional block may be implemented as an integrated unit or further subdivided. Furthermore, each function in Figure 4 may be implemented, for example, by the processor 201 executing a program stored in the ROM 202 or storage device 204, or by a processor located inside the communication circuit 205 executing predetermined software. Note that the details of the processing performed by each functional unit will not be explained in detail here, and only the general functions will be outlined.

[0041] The configuration receiving unit 401 receives configuration information provided by the base station equipment as described above via Layer 3 signaling. The execution instruction receiving unit 402 receives instructions to start and end the measurement from the base station equipment via Layer 1 or Layer 2 signaling. When the execution instruction receiving unit 402 receives an instruction to start the measurement, the measurement unit 403 performs a measurement of the radio quality based on the configuration information received by the configuration receiving unit 401. The measurement result notification unit 404 notifies the connected base station equipment of the results of the measurement performed by the measurement unit 403. The measurement result notification unit 404 may, for example, determine which of the Layer 1 to Layer 3 messages to use to notify the measurement results based on instructions received from the base station equipment or based on a comparison of a predetermined value received from the base station equipment with the measured radio quality. The measurement result notification unit 404 then notifies the base station equipment of the measurement results using the determined type of message.

[0042] (Process flow) Next, using Figure 5, we will explain an example of the processing flow performed in a wireless communication system. Here, we will explain an example where measurements are performed in an environment where the uplink signal transmitted by the terminal device 111 connected to the base station device 101 may interfere with the downlink signal transmitted from the base station device 102 to the terminal device 112, as shown in Figure 1.

[0043] First, information for measurement is shared between base station device 101, to which terminal device 111 is connected, and base station device 102, to which terminal device 112 is connected (S501). For example, base station device 101 provides base station device 102 with information about the SRS transmitted by terminal device 111 so that terminal device 112, which is connected to base station device 102, can perform a measurement of the uplink signal transmitted by terminal device 111, which is connected to base station device 101. In addition, base station device 102 may provide base station device 101 with information such as the frequency range to which downlink resources may be allocated to terminal device 112. Note that if both terminal device 111 and terminal device 112 are connected to the same base station device, the procedure for information sharing between base station devices is omitted.

[0044] Based on the exchanged information, base station devices 101 and 102 determine the configuration information to be notified to the connected terminal device (S502). For example, base station device 102 generates configuration information to cause terminal device 112 to measure the SRS transmitted from terminal device 111, and notifies terminal device 112 of this configuration information via Layer 3 signaling (S503). Also, base station device 101 generates configuration information to cause terminal device 111 to measure the downlink signal transmitted from base station device 102, and notifies terminal device 111 of this configuration information via Layer 3 signaling (S504). Furthermore, base station device 101 transmits the SRS configuration information to terminal device 111 (S505), causing it to transmit the SRS. Note that if terminal device 111 already has the SRS configuration information, the transmission and reception of the configuration information here may be omitted. The base station device 102 instructs the terminal device 112 to start measuring its SRS, for example using Layer 1 DCI (S506). The terminal device 112 measures the SRS based on that instruction (S507) and transmits the measurement result to the base station device 102 (S508). The base station device 101 also instructs the terminal device 111 to start measuring the downlink signal, for example using Layer 1 DCI (S509). The terminal device 111 then measures the downlink signal (e.g., SS or CSI-RS) transmitted from the base station device 102 (S510) and transmits the measurement result to the base station device 102 (S511). The base station devices 101 and 102 exchange the measurement results received from the respective connected terminal devices with the other base station device as needed (S512). For example, the base station device 102 notifies the base station device 101 of the measurement results of the uplink signal from the terminal device 111 at the terminal device 112. As a result, the base station device 101 can cause the terminal device 111 to transmit an uplink signal if the uplink interference is below a predetermined value, and prevent the terminal device 111 from transmitting an uplink signal if the interference is above a predetermined value.Furthermore, the base station device 101 can estimate the radio quality, such as the SINR of the downlink at terminal device 112, when terminal device 111 transmits an uplink signal, based on, for example, the measurement result of the downlink signal at terminal device 111 and the measurement result of the uplink signal at terminal device 112 notified by base station device 102. If the estimated value is greater than or equal to a predetermined value, the base station device 101 may determine that the transmission of the uplink signal by terminal device 111 is permitted.

[0045] As described above, according to this embodiment, even under conditions where interference from uplink signals to downlink signals occurs, measurements can be performed by the terminal device in a timely manner. As a result, it becomes possible to perform measurements appropriately while suppressing a decrease in frequency utilization efficiency, thereby enabling flexible resource allocation and communication while suppressing interference between uplink and downlink communications. Thus, it becomes possible to contribute to Goal 9 of the United Nations-led Sustainable Development Goals (SDGs), "Build resilient infrastructure, promote sustainable industrialization and foster innovation."

[0046] The invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of the gist of the invention.

Claims

1. A notification means that notifies the first terminal device of setting information for measuring the first quality of the uplink signal, which interferes with the downlink signal received by the first terminal device and is transmitted by the second terminal device, via Layer 3 signaling, An instruction means for transmitting an instruction to the first terminal device, by signaling of Layer 1 or Layer 2, to perform the first quality measurement based on the setting information, Receiving means for receiving the measurement results by the first terminal device and It has, The base station device is further characterized in that the notification means notifies the first terminal device, by Layer 3 signaling, of information instructing the first terminal device whether the measurement result should be transmitted as a Layer 1, Layer 2, or Layer 3 message.

2. The base station device according to claim 1, characterized in that the signaling of Layer 2 is signaling by a downlink medium access control / control element (DL MAC CE).

3. The base station device according to claim 1, characterized in that the signaling of Layer 1 is signaling by downlink control information (DCI).

4. The base station device according to claim 1, characterized in that the signaling of Layer 3 is signaling by an RRCReconfiguration message.

5. The base station device according to claim 1, characterized in that the setting information includes information used to measure the reference signal received power (RSRP) of the uplink sounding reference signal (SRS) or the received signal strength indicator (RSSI) of the frequency range in which the uplink signal is transmitted as the uplink signal.

6. When the second terminal device is connected to the base station device, the notification means notifies the second terminal device of setting information for measuring the second quality of the downlink signal transmitted from the base station device to the first terminal device by Layer 3 signaling. The instruction means transmits an instruction to the second terminal device by signaling of layer 1 or layer 2 to perform the second quality measurement based on the setting information. The base station device according to claim 1.

7. The base station device according to claim 6, further comprising means for providing information to the other base station device that enables the third terminal device to measure a third quality of the uplink signal transmitted by the second terminal device when the uplink signal transmitted by the second terminal device interferes with the downlink signal transmitted to the third terminal device connected to the other base station device.

8. The base station device according to claim 7, further comprising receiving means for receiving information from the other base station device that enables the second terminal device to measure the fourth quality of the downlink signal transmitted from the other base station device to the third terminal device.

9. The base station device according to claim 1, further comprising receiving means for receiving information from the other base station device that enables the first terminal device to measure the first quality when the second terminal device is connected to the other base station device.

10. The base station device according to claim 9, further comprising means for providing information to the other base station device that enables the second terminal device to measure the fifth quality of the downlink signal transmitted from the base station device to the first terminal device.

11. A terminal device, When the terminal device receives a downlink signal from the connected base station device, the setting means receives setting information for measuring the first quality of the uplink signal, which interferes with the downlink signal received by the terminal device and is transmitted by the second terminal device, from the base station device via Layer 3 signaling, thereby setting the first quality measurement; A measurement means that receives an instruction from the base station device to perform the first quality measurement via Layer 1 or Layer 2 signaling, and performs a measurement based on the setting information, A notification means that, based on instructions received from the base station device by the Layer 3 signaling, notifies the base station device of the measurement results in a Layer 1, Layer 2, or Layer 3 message, A terminal device characterized by having the following features.

12. The terminal device according to claim 11, characterized in that the signaling of Layer 2 is signaling by a downlink medium access control / control element (DL MAC CE).

13. The terminal device according to claim 11, characterized in that the signaling of Layer 1 is signaling by downlink control information (DCI).

14. The terminal device according to claim 11, characterized in that the signaling of Layer 3 is signaling by an RRCReconfiguration message.

15. BWP setting means for setting Bandwidth Part (BWP), Measurement control means that controls the execution of the measurement during the period when the BWP is effective and prevents the execution of the measurement during the period when the BWP is not effective. The terminal device according to claim 11, further comprising the above.

16. The BWP setting means sets a plurality of BWPs, The terminal device according to claim 15, further comprising switching means for switching the plurality of BWPs at predetermined time intervals.

17. The terminal device according to claim 11, characterized in that the setting information includes information used to measure the reference signal received power (RSRP) of the uplink sounding reference signal (SRS) or the received signal strength indicator (RSSI) in the frequency range to which the uplink signal is transmitted, as the signal of the uplink.

18. The setting means, when an uplink signal transmitted by the terminal device to the base station device interferes with a downlink signal transmitted by the base station device or another base station device, receives setting information for measuring the second quality of the downlink signal transmitted by the base station device or the other base station device from the base station device via Layer 3 signaling, thereby setting the second quality measurement. The measurement means receives an instruction from the base station device to perform the second quality measurement via Layer 1 or Layer 2 signaling, and then performs the measurement based on the setting information. The notification means notifies the base station device of the results of the second quality measurement. The terminal device according to feature 11.

19. A control method performed by a base station device, A notification step in which setting information for measuring the first quality of the uplink signal, which interferes with the downlink signal received by the first terminal device and is transmitted by the second terminal device, is notified to the first terminal device by Layer 3 signaling, A transmission step of transmitting an instruction to the first terminal device to perform the first quality measurement based on the setting information, via signaling at Layer 1 or Layer 2, A receiving step of receiving the measurement results by the first terminal device, Includes, A control method characterized in that, in the notification step, information instructing the first terminal device whether to transmit the measurement result as a Layer 1, Layer 2, or Layer 3 message is notified to the first terminal device by Layer 3 signaling.

20. A control method performed by a terminal device, When the terminal device receives a downlink signal from the connected base station device, the terminal device receives setting information for measuring the first quality of the uplink signal, which interferes with the downlink signal received by the terminal device and is transmitted by the second terminal device, from the base station device via Layer 3 signaling, thereby setting the first quality measurement. The base station device receives an instruction to perform the first quality measurement via Layer 1 or Layer 2 signaling, thereby performing the measurement based on the configuration information. Based on the instructions received from the base station device via the Layer 3 signaling, the measurement results are notified to the base station device via a message in either Layer 1, Layer 2, or Layer 3. A control method characterized by including

21. A program for causing a computer to function as a base station device according to any one of claims 1 to 10.

22. A program for causing a computer to function as a terminal device according to any one of claims 11 to 18.

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