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

Abstract

The base station device notifies, by layer 3 signaling, the first terminal device of setting information for measuring the first quality of an uplink signal, said setting information being transmitted by a second terminal device and interfering with a downlink signal received by the first terminal device. An instruction for performing the measurement of the first quality or stopping the measurement being performed on the basis of the setting information is transmitted to the first terminal device by layer 1 or layer 2 signaling.

Description

Technical Field

[0001] The present invention relates to a technology for improving the efficiency of measuring uplink signals and downlink signals. Background Art

[0002] In cellular communication systems, time division duplex (TDD) is being adopted to flexibly use radio resources. In TDD, time slots are allocated to the uplink for transmitting signals from a terminal device to a base station device and the downlink for transmitting signals from a base station device to a terminal device. In TDD, the amount allocated to the uplink or downlink is flexibly set according to the amount of data in the uplink and downlink, thereby enabling efficient communication.

[0003] On the other hand, if such a flexible setting is used, for example, between cells adjacent to each other, the uplink signal sent from the terminal device may interfere with the downlink signal received by other terminal devices. In addition, the downlink signal sent from the base station device may also interfere with the uplink signal received by other base station devices. Such interference can be called cross-link interference (CLI). In addition, it is also assumed that in two adjacent frequency resources within a cell, common time slots are allocated to the uplink and downlink, respectively. The same interference may also occur in this case. In this way, interference may occur due to flexible control, so it becomes important to reduce the impact of the interference. In non-patent document 1, it is recorded that in order to perform a coordination action between base station devices to reduce CLI, the terminal device measures the size of CLI and reports it to the base station device.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP Appendix, R2-2001700, March 2020 Summary of the invention

[0007] Problems to be solved by the invention

[0008] When measuring the interference between the uplink and the downlink, it is necessary to perform control such as temporarily stopping the communication of the uplink or downlink in the resource assumed to cause the interference. On the other hand, in the method of non-patent document 1, the start and end of the measurement are indicated by layer 3 signaling. Therefore, for example, the period from when the situation where the interference measurement should be performed to the start of the measurement becomes longer, and the measurement may be performed for an unnecessary long time.

[0009] Means used to solve problems

[0010] The present invention provides a technology for appropriately controlling the timing of executing a measurement of interference between uplink and downlink by a terminal device.

[0011] A base station device involved in one embodiment of the present invention comprises: a notification unit, which notifies the first terminal device of setting information for measuring the first quality of a signal for an uplink that interferes with a downlink signal received by the first terminal device and is sent by a second terminal device through layer 3 signaling; and an indication unit, which sends an indication for performing the measurement of the first quality based on the setting information or stopping the measurement in progress to the first terminal device through layer 1 or layer 2 signaling.

[0012] A terminal device involved in one embodiment of the present invention comprises: a setting unit, which, when the terminal device receives a downlink signal from a connected base station device, receives setting information for measuring the first quality of a signal for uplink that interferes with the downlink signal received by the terminal device and is sent by a second terminal device from the base station device through layer 3 signaling, thereby setting the measurement of the first quality; a measuring unit, which receives an instruction for performing the measurement of the first quality based on the setting information or stopping the measurement in progress from the base station device through layer 1 or layer 2 signaling, thereby performing the indicated measurement; and a notification unit, which notifies the base station device of the result of the measurement.

[0013] Effects of the Invention

[0014] According to the present invention, it is possible to appropriately control the timing at which a terminal device measures interference between uplink and downlink.

[0015] Other features and advantages of the present invention will become clear from the following description with reference to the accompanying drawings. In addition, in the accompanying drawings, the same reference numerals are used for the same or similar structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0017] Figure 1 This is a diagram showing an example of the configuration of a wireless communication network.

[0018] Figure 2 This is a diagram showing an example of the hardware configuration of the device.

[0019] Figure 3 It is a diagram showing an example of the functional configuration of a base station apparatus.

[0020] Figure 4This is a diagram showing an example of the functional configuration of a terminal device.

[0021] Figure 5 A diagram showing an example of a process flow executed in a wireless communication network. DETAILED DESCRIPTION

[0022] Hereinafter, the embodiments are described in detail with reference to the accompanying drawings. In addition, the following embodiments do not limit the invention involved in the technical solution. In addition, the combination of features described in the embodiments may not all be necessary for the invention. Two or more of the multiple features described in the embodiments may also be combined arbitrarily. In addition, the same or similar configurations are marked with the same reference numerals, and repeated descriptions are omitted.

[0023] (System Configuration)

[0024] exist Figure 1 An example of the configuration of a wireless communication system involved in the present embodiment is shown in . The wireless communication system may be, for example, a wireless communication system that complies with the fifth generation (5G) cellular communication standard of the Third Generation Partnership Project (3GPP (registered trademark)). The wireless communication system includes, for example, a base station device 101 and a base station device 102 and a terminal device 111 and a terminal device 112. In one example, the terminal device 111 establishes a connection with the base station device 101 to communicate, and the terminal device 112 establishes a connection with the base station device 102 to communicate. In addition, this is an example, and for example, both the terminal device 111 and the terminal device 112 may be connected to the base station device 101 to communicate. Figure 1 In order to simplify the description, two base station devices and two terminal devices are shown, but the wireless communication system can include a plurality of base station devices and a plurality of terminal devices without losing generality.

[0025] In this embodiment, in one time slot of one frequency band, flexible resource allocation is performed such that uplink communication and downlink communication are mixed. For example, when the base station device 101 allocates uplink resources to the terminal device 111, the base station device 102 can allocate downlink resources to the terminal device 112. In such a case, the uplink signal sent from the terminal device 111 may interfere with the downlink signal received in the terminal device 112. In the case where the terminal device 111 is located near the terminal device 112, the interference may be received at a very high receiving power in the terminal device 112. Moreover, at the position of the terminal device 112, the timing of the frame may be greatly offset between the timing of receiving the downlink signal and the timing of receiving the uplink signal sent from the terminal device 111. In this case, even if the frequency resources used are different in the uplink and downlink, the orthogonality of the signal cannot be guaranteed, so it may be impossible to ignore the interference. Therefore, in the presence of such interference, the communication of the terminal device 112 may not be performed. In addition, the downlink signal transmitted from the base station apparatus 102 may interfere with the uplink signal transmitted from the terminal apparatus 111 at the location of the base station apparatus 101. However, the interference can be suppressed to a sufficiently low level by, for example, configuring the base station apparatus 101 and the base station apparatus 102 at locations sufficiently separated from each other, or by controlling the direction (tilt angle) of the radio wave transmitted from the base station apparatus 102.

[0026] Therefore, in this embodiment, the description is made with an eye on a situation where an uplink signal transmitted from the terminal device 111 interferes with a downlink signal transmitted to the terminal device 112. In addition, 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 uses a portion of the frequency resources in the frequency band that can be used for the terminal device 112 to transmit a downlink signal, and uses another portion of the frequency resources in the usable frequency band to enable the terminal device 111 to transmit an uplink signal, the processing described below can be applied. In addition, in Figure 1 In the example of FIG. 1 , an example is shown in which an uplink signal transmitted by the terminal device 111 interferes with a downlink signal transmitted to the terminal device 112. However, the uplink signal transmitted by the terminal device 112 may interfere with the downlink signal transmitted to the terminal device 111. Therefore, in the following, when no special distinction is required, the description of the reference numerals is sometimes omitted, and the terminal devices 111 and 112 are referred to as "terminal devices".

[0027] In order to deal with the interference between the uplink signal and the downlink signal between the terminal devices, it is assumed that the surrounding environment is observed in the terminal device, and after confirming that the influence of the interference between the terminal devices is low, the uplink resources are allocated. For example, the terminal device 112 measures the uplink signal sent by the terminal device 111, and the terminal device 111 measures the downlink signal received by the terminal device 112, etc., and performs resource allocation control based on the measurement result. The terminal device detects the surrounding wireless signals and measures the received signal strength indicator (RSSI), the reference signal received power (RSRP), the reference signal received quality (RSRQ), the signal-to-noise ratio (SNR), and the signal to interference plus noise ratio (SINR). For example, the terminal device can measure the surrounding uplink signals during the period when the downlink signal is not sent, and can measure the surrounding downlink signals during the period when the uplink signal is not sent.

[0028] For example, as a signal of the surrounding uplink, the terminal device measures the RSRP of the sounding reference signal (SRS) being sent by the surrounding terminal devices, the RSSI of the SRS or 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 size of the cross-link interference (CLI). The measurement can be mainly performed by a terminal device that may be interfered with by the uplink signal from the surrounding terminal devices. In addition, the terminal device is configured to send SRS under the control of the base station device when performing uplink communication that may interfere with downlink communication. Here, the terminal device sending SRS may not send the uplink signal being sent by other terminal devices. In addition, the terminal device sending SRS may also measure the SRS and other signals being sent by other terminal devices in other frequency bands other than the frequency band in which the SRS and other signals are being sent in the available frequency band, or during the period when the SRS and other signals are not being sent. In addition, the terminal device may also use the RSSI of the entire usable frequency band as a measurement result related to the uplink signal during the period when the downlink signal is not sent. In addition, the terminal device may receive information indicating the frequency resources allocated to the uplink in the surrounding area from the base station device and perform the measurement based on the information.

[0029] In addition, for example, as a signal of the surrounding downlink, the terminal device can measure the RSRP, SINR, RSSI, etc. of the channel state information (CSI)-reference signal (RS), synchronization signal (SS), etc. being sent by the surrounding base station devices. Then, the terminal device notifies the connected base station device of the measured results (CSI-RSRP / SINR / RSSI, SS-RSRP / SINR / RSSI, etc.). In addition, the terminal device can also measure the RSSI of other signals. In one example, the terminal device can measure the RSRP, SINR, etc. of these signals for the frequency band where CSI-RS and SS are being sent, and measure the RSSI in the frequency band where CSI-RS and SS are not sent. In addition, with respect to the downlink signal, it can be set to be measured by a terminal device that sends an uplink signal that may interfere with the downlink communication. However, it is not limited to this, and the measurement can also be performed by a terminal device that may be interfered with by the uplink signal of the surrounding terminal device.

[0030] In addition, in 5G, multiple bandwidth parts (Bandwidth Part: BWP) can be set for the terminal device. The terminal device can perform measurements only in the frequency band within the activated BWP among the multiple BWPs. Therefore, when multiple BWPs are set, the terminal device can select the activated BWP for measurement in a manner that the frequency domain of the measurement object is included in the range of the set BWP. In addition, when the terminal device switches to use multiple BWPs at predetermined time intervals, the terminal device can select a BWP that can perform interference measurement as an activated period and measure the interference in the BWP. In addition, when the measurement of the frequency domain of the measurement object cannot be performed in any of the set BWPs, the terminal device may not perform the measurement. In addition, when the terminal device receives a setting from the base station device that none of the set BWPs includes the frequency domain of the measurement object, the setting may be discarded. In addition, in this case, the terminal device may also notify the base station device that none of the set BWPs includes the frequency domain of the measurement object and the setting is discarded. In addition, in one example, the base station device may also reset the BWP so as not to perform such a setting.

[0031] The base station device can receive the result of the measurement performed by the terminal device, and determine, for example, the resource allocation of the uplink based on the measurement result. For example, when the reception quality of the downlink signal in the terminal device of the object of the uplink resource allocation is above a sufficiently high predetermined value, it is considered that there is a certain tolerance to interference. Therefore, in such a case, even if there is interference in the uplink, the base station device can determine that downlink communication can be performed, and allocate uplink resources to the terminal device that obtains the measurement value. On the other hand, when the reception quality of the downlink signal in the terminal device of the object of the uplink resource allocation is less than a predetermined value, the uplink resource may not be allocated to the terminal device that obtains the measurement value. In addition, for example, the base station device can determine the resource allocation of the downlink based on the result of the measurement performed by the terminal device. For example, it is assumed that the strength and quality of the uplink signal are sufficiently small and less than the predetermined value for the terminal device, and the downlink communication can be performed without being subject to large interference from the uplink signal. That is, it is assumed that the first terminal device whose uplink signal reception power is sufficiently small does not have a second terminal device that communicates via the uplink around it. Therefore, in the same time slot as the downlink resource allocated to the first terminal device, even if the uplink resource is allocated to the second terminal device, the influence of interference can be fully suppressed. Therefore, the base station device can allocate the downlink resource to the terminal device that obtains such a measurement value. In addition, the base station device to which the terminal device that sends the uplink signal is connected can allocate the uplink resource to the terminal device in the same time slot as the resource. In addition, in this case, when the terminal device as the receiver of the downlink signal and the terminal device as the sender of the uplink signal are connected to the same base station device, the base station device can perform the allocation of both the uplink and the downlink. On the other hand, when the terminal device as the receiver of the downlink signal and the terminal device as the sender of the uplink signal are connected to different base stations, the measurement results can be shared between the base stations of the connection objects of these terminal devices, and resources can be allocated based on the measurement results. In addition, it is also possible to determine whether resources can be allocated in any of the base stations of the connection objects of these terminal devices, and notify the base station device of the other party of a part of the determination result. In this case, the information of the measurement result can be provided from other base stations to the base station device that determines whether resources can be allocated. The base station device that determines whether resources can be allocated can be a base station device connected to a terminal device that needs uplink resources, or a base station device connected to a terminal device that receives downlink signals. In addition, it is also possible to determine whether resources can be allocated by base station devices other than these or other network nodes. In addition, it is also possible to determine whether uplink resources can be allocated only, and of course it is also possible to determine whether downlink resources can be allocated.Similarly, it is also possible to determine whether only downlink resources can be allocated, and of course it is also possible to determine whether uplink resources can be allocated. In addition, the allocation of these resources can be performed based on various criteria, but it will not be described in detail here.

[0032] The base station device is configured to notify the terminal device of the settings for causing the terminal device to perform the above-mentioned measurement. For example, the base station device can notify the terminal device performing uplink communication of the setting information for measuring the wireless quality of the downlink signal in the resource block that may cause interference due to the uplink communication. The base station device, for example, notifies the terminal device of the setting information of the designated frequency resource to measure the wireless quality of the downlink in the resource block. In addition, when CSI-RS and SS are sent in the resource block, information indicating the position and sequence of the CSI-RS and SS can also be notified to the terminal device as setting information. In addition, the setting information can also include information indicating the type of wireless quality to be measured, such as RSSI, RSRP, SINR, etc. In addition, the base station device can also notify the terminal device that may perform downlink communication in the resource block of the setting information for measuring the wireless quality of the uplink signal sent by the terminal device performing uplink communication. In this case, the setting information can, for example, include information on the resource element of the signal sent by the terminal device performing uplink communication as information indicating the frequency range of the measurement object. For example, the setting information may include information on the position of resource elements in which a terminal apparatus performing uplink communication transmits an SRS and a sequence for generating an SRS.

[0033] In addition, the base station device can notify the terminal device of the setting information through signaling of layer 3 (for example, the radio resource control (RRC) layer). The base station device can send the above-mentioned setting information through an RRC reconfiguration message, for example. The RRC reconfiguration message contains a MeasObjectCLI information element that specifies the measurement object related to the CLI. In the rssi-ResourceConfig-r16 within the MeasObjectCLI information element, the frequency position of the physical resource block to be measured can be specified. In addition, through this information, information such as the measurement period and the measurement cycle can be notified to the terminal device as information on the timing of the measurement. Thus, for example, the setting information for the measurement of the downlink signal can be notified to the terminal device. In addition, in the srs-ResourceConfig-r16 within the MeasObjectCLI information element, the setting information of the SRS to be measured can be notified to the terminal device. Thus, for example, the setting information for the measurement of the uplink signal can be notified to the terminal device.

[0034] The above-mentioned settings can be applied, for example, to the case where the terminal device that sends the uplink signal and the terminal device that receives the downlink signal are connected to the same base station device. In the case where the terminal device that sends the uplink signal and the terminal device that receives the downlink signal are connected to different base station devices, the setting information for the measurement in the adjacent cell can also be notified to the terminal device on this basis. In this case, the base station device can, for example, notify the terminal device that performs uplink communication of the information used to measure the synchronization signal and the broadcast signal (SSB) sent in the cell to which the terminal device that performs downlink communication is connected. In addition, in the case where the base station device that provides the cell to which the terminal device that sends the uplink signal is connected and the base station device that provides the cell to which the terminal device that receives the downlink signal is connected are provided by different communication operators, the information can also be provided. As the setting information for the measurement, information related to the frequency channel for sending the SSB can be sent. The information of the frequency channel can be represented by the Global Synchronization Channel Number (GSCN), for example. The terminal device can perform the measurement of the SSB based on the setting information, determine the position in the frequency channel where the SSB is sent, the information of the sending timing of the SSB, and the wireless quality information such as the received signal strength, RSRP, and RSRQ, and report to the base station device. In addition, the terminal device can report the frequency position of the SSB to the base station device through the GSCN and the NR Absolute Radio Frequency Channel Number (NR-ARFCN). In addition, when the base station device knows the frequency position of the SSB of other base station devices that use frequency channels adjacent to the frequency channel currently being used by the present device, it can send the setting information specifying the frequency position to the terminal device. The frequency position can be notified by NR-ARFCN, for example. In addition, the base station device can also notify the terminal device of the measurement gap (Measurement Gap) during which the SSB of the adjacent channel is measured without sending or receiving data with the present device.

[0035] Here, for example, the base station device allocates uplink and downlink resources to the terminal device connected to the present device in a common time slot within a frequency band. In addition, it is assumed that the resources allocated to the uplink and the resources allocated to the downlink are separated in the frequency domain, but the uplink signal may interfere with the downlink signal. In this case, the base station device can perform the following under the authority of the present device: stop the transmission of the downlink signal for the purpose of measuring the uplink, and stop the transmission of the uplink signal for the purpose of measuring the downlink. Therefore, the base station device, for example, maintains information such as the position and sequence of the resource elements for transmitting the uplink SRS, the position of transmitting the downlink CSI-RS, SS or other signals. Therefore, when the terminal device connected to the present device performs the measurement of the influence of the interference under the present device, the base station device can notify the terminal device that should perform the measurement of the maintained information. On the other hand, the base station device does not maintain information such as the transmission position of the SRS transmitted by the terminal device connected to other base station devices, the CSI-RS, SS or other signals transmitted by other base station devices. Therefore, in the present embodiment, the base station apparatus can exchange information used for measurement before generating the setting information used for the above-mentioned measurement with other base station apparatuses.

[0036] For example, a base station device connected to a terminal device (a terminal device that may cause interference) that sends an uplink signal provides other base station devices with information related to the transmission of the uplink signal. For example, information indicating that a part of the frequency range in the time slot of the downlink is allocated to the uplink is sent to other base station devices. In addition, the time slot allocated to the downlink may be reallocated to the time slot of the uplink to notify other base station devices. In addition, information indicating the frequency range (physical resource block) of the signal sent in the uplink and information (resource elements sent, sequences for generating SRS, etc.) of the SRS sent by the terminal device communicating in the resources allocated to the uplink may be notified to other base station devices. When other base station devices receive the notification, they may enable the terminal device that may be interfered by the uplink signal to perform the measurement of the uplink signal based on the information of the notification. For example, other base station devices may specify the frequency range of the uplink signal that may be sent as an interference source, and instruct the terminal device connected to this device to perform the measurement of the RSSI within the frequency range. Furthermore, other base station apparatuses may notify the connected terminal apparatus of resources for transmitting the SRS and information for generating the sequence of the SRS, and instruct the terminal apparatus to measure the RSRP and the like of the SRS.

[0037] In addition, a base station device that is transmitting a downlink signal that may be interfered by an uplink signal from a terminal device connected to another base station device may notify other base station devices that may transmit uplink signals that may become interference sources of information of CSI-RS and SS transmitted in the device. In addition, the base station device may, for example, notify the other base station device of information indicating resources (e.g., physical resource blocks) that are intended to be allocated to the terminal device connected to the device and that interfere with uplink signals in a cell provided by other base station devices. Other base station devices may generate setting information for measurements notified to the terminal device to perform measurements in the resources.

[0038] In the past, the base station device notified the terminal device of the start and end of the measurement through layer 3 signaling in addition to the notification of the setting information as described above. When the start and end of the measurement are notified through layer 3 signaling, the measurement cannot be started and ended in a timely manner. For example, the time from the occurrence of interference between the uplink signal and the downlink signal to the start of the measurement may be prolonged. In addition, when the transmission of the downlink signal is stopped when the uplink signal is measured, and when 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 the downlink signal and the uplink signal is stopped unnecessarily, and the frequency utilization efficiency may be reduced. In addition, when the measurement needs to be performed, if the signaling in layer 3 is performed each time, the frequency utilization efficiency may be reduced due to the overhead of the signaling. In addition, in an environment where the TDD configurations of two adjacent cells are different, there may be an environment where the uplink and downlink are used only for a very short period (instantaneously), including a case where part of the uplink time slot is dynamically used as a downlink, a case where part of the downlink time slot is dynamically used as an uplink, etc. In such an environment, when the start and end of measurement are instructed by layer 3 signaling, it is assumed that the necessary interference measurement cannot be performed in real time because the period from when the situation requiring interference measurement is reached to when the measurement is started is long.

[0039] Therefore, in this embodiment, the base station device indicates the start and end of the measurement through layer 1 or layer 2 signaling. For example, the base station device can use downlink control information (DCI) included in the physical downlink control channel (PDCCH) to send the start and end of the measurement through layer 1 signaling. In addition, the base station device can also use the downlink media access control / control element (DL MAC CE) to send the start and end of the measurement through layer 2 signaling.

[0040] The terminal device starts the measurement based on the setting information notified in advance through the layer 3 signaling by the layer 1 or layer 2 signaling indicating the start of the measurement. Then, the terminal device notifies the base station device of the measurement result. The terminal device can, for example, use a measurement report (Measurement Report) which is a layer 3 message in the same way as before to notify the measurement result. However, not limited to this, the terminal device can also use the uplink control information (UCI) of layer 1, the uplink MAC CE (UL MAC CE) of layer 2, etc. to send the measurement result to the connected base station device. In one example, the base station device can prepare resources for the physical uplink control channel containing the UCI of the measurement result in advance, and notify the terminal device of the resources.

[0041] In addition, the terminal device may dynamically switch between reporting in layer 1 or layer 2 and reporting in layer 3. For example, the terminal device on the side receiving the downlink signal may be configured to report the measurement result in layer 1 or layer 2 when the measurement value of the uplink signal is greater than a predetermined value, and to report the measurement result in layer 3 when the measurement value is less than the predetermined value. In addition, for example, the terminal device on the side transmitting the uplink signal may be configured to report the measurement result in layer 1 or layer 2 when the measurement value of the downlink signal is less than a predetermined value, and to report the measurement result in layer 3 when the measurement value is greater than the predetermined value. The base station device may notify the terminal device of information indicating a predetermined value for determining the switching of the message when reporting. In addition, the first predetermined value used for determining when switching to reporting in layer 1 or layer 2 during reporting in layer 3 and the second predetermined value used for determining when switching to reporting in layer 3 during reporting in layer 1 or layer 2 may be the same value or different values. In addition, in the above example, an example of determining whether to report based on layer 3 or to report based on another layer (layer 1 or layer 2) is described, but it is also possible to further determine which message of layer 1 and layer 2 should be used for reporting. The base station device may further notify the terminal device of the predetermined value used for determination.

[0042] In addition, the base station device may also notify the terminal device whether the measurement result should be reported through any one of the layer 1 to layer 3 messages. The notification here may be performed, for example, through a layer 3 message. The base station device may, for example, send the notification to the terminal device together with the above-mentioned setting information. In addition, the base station device may, for example, notify the terminal device to report through a layer 1 or layer 2 message when it is determined that a predetermined event has occurred through a layer 3 message such as a measurement report. In one example, the base station device may notify the terminal device to report the measurement result through a layer 1 or layer 2 message when the measurement value of the uplink signal reported through a layer 3 message from the terminal device on the side receiving the downlink signal is greater than a predetermined value. In addition, the base station device may also notify the terminal device to report the measurement result in a layer 1 or layer 2 message when the measurement value of the downlink signal reported through a layer 3 message from the terminal device on the side sending the uplink signal is less than a predetermined value. In addition, the base station device may notify the terminal device as an event that the measured value of the uplink signal in the terminal device on the side receiving the downlink signal is greater than a predetermined value, or that the measured value of the downlink signal in the terminal device on the side transmitting the uplink signal is less than a predetermined value. Furthermore, when the base station device receives a report of the measured value based on the event through a layer 3 message, it may instruct the terminal device of the sender of the report to report the measurement result in a layer 1 or layer 2 message.

[0043] In addition, although layer 3 messages are inferior to layer 1 or layer 2 messages in terms of real-time performance, they can report measurement results in detail. Using this feature, the terminal device can also perform detailed reporting in layer 3 messages, and send reduced information such as the difference between the measurement value notified by the layer 3 message and the measurement value of the report object in the layer 1 or layer 2 message. In addition, when reporting the measurement value in the layer 1 or layer 2 message, the terminal device can also send the difference between the measurement value last sent in any of the layer 1 to layer 3 messages and the measurement value of the report object. In addition, when reporting the measurement value in the layer 1 or layer 2 message, the terminal device can notify the base station device of only the information indicating whether the measurement value is above the predetermined value as the information of the measurement value.

[0044] For example, the terminal device can notify the base station device of information indicating the result of the measurement of the measured value as the information of the measurement result. That is, the measured value can be notified to the base station device as the information of the measurement result, such as the result of measuring the SRS-RSRP of the uplink, the result of measuring the RSSI of the uplink, or the result of measuring the SS and CSI-RS of the downlink. This information can be notified as a resource indicator. In addition, in the case of using UCI to notify the information of the measurement result of the uplink, the information can also be sent by UCI of a format obtained by extending the format used in the notification of the measurement result of the previous CSI-RS and SSB. In this case, the resource indicator representing SRS-RSRP, RSSI, etc. can be included in the UCI instead of the resource indicator representing CSI-RS and SSB in the past. In addition, in this case, a field of the number of bits required to uniquely determine the type of measurement is ensured as a field for the resource indicator. In addition, the field for storing the measurement value of RSSI and the measurement value of SRS-RSRP is ensured to be 7 bits, for example, and the measurement result can be sent using the field specified by the existing format. In addition, in order to reduce overhead, a 4-bit field, for example, which does not exist in the existing format and stores the difference value from the last measurement value, etc., may be used to send the difference value between the measurement result and the last measurement value. In addition, UCI including a 1-bit field indicating whether the measurement value is greater than a predetermined value may be sent to the base station device. In addition, it is also possible to dynamically switch which of these formats should be used. In this case, for example, which of these formats to use can be specified by an instruction from the base station device.

[0045] In addition, when the measurement is started using the signaling of layer 1 or layer 2, the timing of the measurement can also be indicated by the signaling of layer 1 or layer 2. For example, the timing of the measurement can also be specified by the offset (offset) and the measurement time (duration) from the timing indicated by the frame and symbol of the signaling for receiving the measurement start of layer 1 or layer 2. The offset and duration can be dynamically indicated by the signaling of layer 1 or layer 2. Here, the set of parameters that should actually be applied can also be indicated by the signaling of layer 1 or layer 2 from the set of one or more offset and measurement time parameters set by the signaling of layer 3. In addition, as the offset and duration, a fixed value that is statically predetermined can also be used.

[0046] As described above, for the measurement for evaluating the interference between the uplink and the downlink, the setting information thereof is sent and received using layer 3 signaling, and then the measurement using the setting information is started or ended using layer 1 or layer 2 signaling. Thus, the measurement can be performed in a timely manner, and the measurement can be performed appropriately while suppressing the reduction in frequency utilization efficiency. In addition, by performing the measurement appropriately, resources can be flexibly allocated for communication while suppressing the interference between the uplink communication and the downlink communication.

[0047] (Device Configuration)

[0048] use Figure 2 , an example of the hardware configuration of a base station device and a terminal device is described. In one example, the base station device and the terminal device are configured to include a processor 201, ROM 202, RAM 203, a storage device 204, and a communication circuit 205. The processor 201 is a computer configured to include one or more processing circuits such as a general-purpose CPU (central processing unit) and an ASIC (application-specific integrated circuit), and performs the overall processing of the device and the above-mentioned processing by reading and executing programs stored in ROM 202 and the 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 the terminal device. RAM 203 functions as a workspace when the processor 201 executes the program, and is also a random access memory that stores temporary information. The storage device 204 is, for example, composed of a removable external storage device. The communication circuit 205 is, for example, composed of circuits for wireless communications of 5G and subsequent standards. In addition, in Figure 2 In the figure, one communication circuit 205 is illustrated, but for example, the base station device and the terminal device may also have more than two communication circuits. In addition, for example, the base station device and the terminal device may have an antenna shared with the wireless communication circuit for 5G and its subsequent standards. In addition, the base station device and the terminal device may also have an antenna for 5G and an antenna for its subsequent standards, respectively. In addition, the terminal device may also have a communication circuit for other wireless communication networks such as a wireless LAN. In addition, the base station device and the terminal device may have separate communication circuits for each of the multiple frequency bands that can be used, or may have a common communication circuit for at least a portion of these frequency bands. In addition, in the present embodiment, the terminal device has multiple communication circuits that can communicate in a common frequency band. In addition, the base station device may also have a wired communication circuit used when communicating with other base station devices and nodes of the core network.

[0049] Figure 33 is a diagram showing an example of a functional configuration of a base station device. The base station device includes, 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 as its functions. Figure 3 In the figure, only the functions particularly related to this embodiment are shown, and the illustration of various other functions that the base station device may have is omitted. For example, the base station device of course has other functions that the base station devices of 5G and subsequent standards generally have. In addition, Figure 3 The functional blocks are shown schematically, and each functional block can be implemented as an integrated whole or further subdivided. Figure 3 Each function of the MCU 201 can be realized by, for example, executing a program stored in the ROM 202 or the storage device 204, or by, for example, executing predetermined software by a processor in the communication circuit 205. In addition, the details of the processing performed by each functional unit will not be described here, and only the general functions will be summarized.

[0050] The setting notification unit 301 notifies the terminal device in connection of setting information for measuring the influence of interference caused by the uplink signal on the downlink signal, using signaling of layer 3 (e.g., RRC layer) for the terminal device in connection. For example, in a case where the first terminal device in connection is a device on the side that is interfered by the uplink signal sent from the second terminal device, the setting notification unit 301 notifies the first terminal device of setting information for making it measure the uplink signal sent from the second terminal device. In addition, for example, in a case where the first terminal device in connection is a device on the side that sends a signal that interferes with the downlink signal sent to the second terminal device, the setting notification unit 301 notifies the first terminal device of setting information for making it measure the quality of the resource that can send the downlink signal to the second terminal device. The details of the setting information are as described above, so the detailed description here is omitted.

[0051] The measurement execution instruction unit 302 transmits an instruction to start and end the measurement of the radio quality based on the setting information to the terminal device notified of the setting information by the setting notification unit 301 through layer 1 or layer 2 signaling. The measurement result receiving unit 303 receives the result of the measurement from the terminal device instructed to perform the measurement by the measurement execution instruction unit 302. In addition, the measurement result receiving unit 303 receives the information of the measurement result through, for example, the type of message instructed by the setting notification unit 301 to the terminal device, and the message determined by the terminal device based on the information of the predetermined value notified by the setting notification unit 301 to the terminal device in order to determine the type of message.

[0052] The information exchange unit 304 exchanges information for determining the settings of the measurement and information on the measurement results with other base station devices. For example, in a case where the first terminal device in connection is a device on the side that is interfered by the uplink signal sent from the second terminal device connected to the other base station device, the information exchange unit 304 can receive information related to the SRS sent by the second terminal device from the other base station device. In addition, in this case, the information exchange unit 304 can provide information on downlink resources that can be allocated to the first terminal device to the other base station devices. In addition, for example, in a case where the first terminal device in connection is a device on the side that sends a signal that interferes with the downlink signal sent to the second terminal device, the information exchange unit 304 can provide information related to the SRS sent by the first terminal device to the other base station devices. In addition, in this case, the information exchange unit 304 can receive information on downlink resources that can be allocated to the second terminal device from the other base station devices.

[0053] Figure 4 4 is a diagram showing an example of a 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 as its functions. Figure 4 In the figure, only the functions particularly related to the present embodiment are shown, and the illustration of various other functions that the terminal device may have is omitted. For example, the terminal device of course has other functions that terminal devices of 5G and subsequent standards generally have. In addition, Figure 4 The functional blocks are shown schematically, and each functional block can be implemented as an integrated whole or further subdivided. Figure 4 Each function of the MCU 201 can be realized by, for example, executing a program stored in the ROM 202 or the storage device 204, or by executing predetermined software in a processor in the communication circuit 205. In addition, the details of the processing performed by each functional unit will not be described here, and only the general functions will be summarized.

[0054] The setting receiving unit 401 receives the setting information provided from the base station device as described above via layer 3 signaling. The execution instruction receiving unit 402 receives the execution start instruction and the execution end instruction of the measurement from the base station device via layer 1 or layer 2 signaling. When the execution instruction receiving unit 402 receives the execution start instruction of the measurement, the measurement unit 403 performs the measurement of the radio quality based on the setting information received in the setting receiving unit 401. The measurement result notification unit 404 notifies the connected base station device of the result of the measurement performed in the measurement unit 403. In addition, the measurement result notification unit 404 can determine which of the messages of layer 1 to layer 3 to use to notify the measurement result based on, for example, an instruction received from the base station device or based on a comparison between a predetermined value received from the base station device and the radio quality of the measurement result. Then, the measurement result notification unit 404 notifies the base station device of the measurement result through the determined type of message.

[0055] (Processing flow)

[0056] Next, use Figure 5 , an example of a process flow executed in a wireless communication system is described. Figure 1 As shown, an example will be described in which measurement is performed in an environment where there is a possibility of interference with a downlink signal transmitted from the base station apparatus 102 to the terminal apparatus 112 using an uplink signal transmitted from the terminal apparatus 111 connected to the base station apparatus 101 .

[0057] First, information sharing for measurement is performed between the base station apparatus 101 connected to the terminal apparatus 111 and the base station apparatus 102 connected to the terminal apparatus 112 (S501). For example, the base station apparatus 101 provides the base station apparatus 102 with information related to the SRS transmitted by the terminal apparatus 111 so that the terminal apparatus 112 connected to the base station apparatus 102 can perform measurement of the uplink signal transmitted by the terminal apparatus 111 connected to the base station apparatus 102. In addition, the base station apparatus 102 can provide the base station apparatus 101 with information such as the frequency range in which downlink resources may be allocated to the terminal apparatus 112. In addition, when the terminal apparatus 111 and the terminal apparatus 112 are both connected to one base station apparatus, the step of information sharing between the base station apparatuses is omitted.

[0058] The base station apparatus 101 and the base station apparatus 102 determine the setting information to be notified to the terminal apparatus in connection based on the exchanged information (S502). For example, the base station apparatus 102 generates setting information for causing the terminal apparatus 112 to perform the measurement of the SRS transmitted from the terminal apparatus 111, and notifies the terminal apparatus 112 of the setting information through layer 3 signaling (S503). In addition, the base station apparatus 101 generates setting information for causing the terminal apparatus 111 to perform the measurement of the downlink signal transmitted from the base station apparatus 102, and notifies the terminal apparatus 111 of the setting information through layer 3 signaling (S504). In addition, the base station apparatus 101 transmits the setting information of the SRS to the terminal apparatus 111 (S505), causing it to transmit the SRS. In addition, when the terminal apparatus 111 already has the setting information of the SRS, the transmission and reception of the setting information here may be omitted. The base station apparatus 102, for example, uses the DCI of layer 1 to instruct the terminal apparatus 112 to start the measurement of the SRS (S506). The terminal device 112 measures the SRS based on the indication (S507) and sends the measurement result to the base station device 102 (S508). In addition, the base station device 101 uses, for example, the DCI of layer 1 to instruct the terminal device 111 to start the measurement of the downlink signal (S509). Then, the terminal device 111 measures the downlink signal (e.g., SS, CSI-RS) (S510) sent from the base station device 102, and sends the measurement result to the base station device 102 (S511). The base station device 101 and the base station device 102 exchange the measurement results received from the terminal devices in their respective connections with the base station device of the other party as needed (S512). For example, the base station device 102 notifies the base station device 101 of the measurement result of the uplink signal from the terminal device 111 in the terminal device 112. Thus, the base station apparatus 101 can be set to make the terminal apparatus 111 transmit an uplink signal when the uplink interference is less than a predetermined value, and not to make the terminal apparatus 111 transmit an uplink signal when the interference is greater than a predetermined value. In addition, the base station apparatus 101 can estimate the radio quality such as the SINR of the downlink in the terminal apparatus 112 when the terminal apparatus 111 transmits the uplink signal, based on the measurement result of the downlink signal in the terminal apparatus 111 and the measurement result of the uplink signal in the terminal apparatus 112 notified from the base station apparatus 102. Furthermore, the base station apparatus 101 can also determine that the transmission of the uplink signal by the terminal apparatus 111 is permitted when the estimated value is greater than a predetermined value.

[0059] As described above, according to this embodiment, under the condition that the uplink signal interferes with the downlink signal, the measurement by the terminal device can be performed in a timely manner. As a result, the measurement can be appropriately performed while suppressing the reduction in frequency utilization efficiency, thereby enabling communication by flexibly allocating resources while suppressing the interference between uplink communication and downlink communication. Therefore, it is possible to contribute to Goal 9 of the Sustainable Development Goals (SDGs) led by the United Nations, "Improve resilient infrastructure, promote sustainable industrialization, and seek to expand innovation."

[0060] The present invention is not limited to the above-described embodiments, and various modifications and changes can be made within the scope of the gist of the present invention.

[0061] This application claims priority based on Japanese patent application No. 2022-141010 filed on September 5, 2022, the entire contents of which are incorporated herein by reference.

Claims

1. A base station device, wherein: The base station device comprises: a notification unit that notifies the first terminal device of setting information for measuring a first quality of an uplink signal that causes interference to a downlink signal received by the first terminal device and is transmitted by the second terminal device, through layer 3 signaling; as well as An instruction unit transmits, to the first terminal device, an instruction for executing the measurement of the first quality based on the setting information or for stopping the measurement being executed, through layer 1 or layer 2 signaling.

2. The base station device according to claim 1, wherein: The layer 2 signaling is based on downlink medium access control / control element (DL MAC CE) signaling.

3. The base station device according to claim 1, wherein: The layer 1 signaling is based on downlink control information (DCI) signaling.

4. The base station device according to claim 1, wherein: The layer 3 signaling is based on the RRC reconfiguration message.

5. The base station device according to claim 1, wherein: The base station device further includes a receiving unit that receives the measurement result performed by the first terminal device.

6. The base station device according to claim 5, wherein: The notification unit further notifies the first terminal device, through the layer 3 signaling, of information indicating which message of layer 1, layer 2, and layer 3 should be used to transmit the measurement result to the first terminal device.

7. The base station device according to claim 5, wherein: The notification unit further notifies the first terminal device of a predetermined value related to the first quality through the layer 3 signaling, the predetermined value being used by the first terminal device to determine through which message of layer 1, layer 2, and layer 3 the measurement result should be transmitted.

8. The base station device according to claim 1, wherein: The setting information includes information for measuring, as the uplink signal, a reference signal received power (RSRP) of a sounding reference signal (SRS) of the uplink or a received signal strength indicator (RSSI) of a frequency range in which the uplink signal is transmitted.

9. The base station device according to claim 1, wherein: When the second terminal device is connected to the base station device, the notification unit notifies the second terminal device of setting information for measuring a second quality of a downlink signal transmitted from the base station device to the first terminal device through layer 3 signaling, The instruction unit transmits, to the second terminal device, an instruction for executing the measurement of the second quality based on the setting information or for stopping the measurement being executed, through layer 1 or layer 2 signaling.

10. The base station device according to claim 9, wherein: The base station device also has a providing unit, which provides information on the third quality of the uplink signal sent by the second terminal device to the other base station device so that the third terminal device can measure the third quality of the uplink signal sent by the second terminal device when the uplink signal sent by the second terminal device interferes with the downlink signal sent to the third terminal device connected to the other base station device.

11. The base station device according to claim 10, wherein: The base station device further includes a receiving unit that receives, from the other base station device, information for enabling the second terminal device to measure fourth quality of a downlink signal transmitted from the other base station device to the third terminal device.

12. The base station device according to claim 1, wherein: The base station device further includes a receiving unit that receives, when the second terminal device is connected to another base station device, measurement information for enabling the first terminal device to measure the first quality from the other base station device.

13. The base station device according to claim 12, wherein: The base station device further includes a providing unit configured to provide the other base station device with information for enabling the second terminal device to measure a fifth quality of a downlink signal transmitted from the base station device to the first terminal device.

14. A terminal device, wherein: The terminal device comprises: a setting unit that receives, from the base station device through layer 3 signaling, setting information for measuring a first quality of a signal for uplink that is sent by a second terminal device and causes interference to the downlink signal received by the terminal device, when the terminal device receives a downlink signal from the connected base station device, thereby setting the first quality measurement; a measurement unit that receives, from the base station device, an instruction to perform measurement of the first quality based on the setting information or to stop the measurement in progress through layer 1 or layer 2 signaling, thereby performing the instructed measurement; as well as A notification unit notifies the base station device of a result of the measurement.

15. The terminal device according to claim 14, wherein: The layer 2 signaling is based on downlink medium access control / control element (DL MAC CE) signaling.

16. The terminal device according to claim 14, wherein: The layer 1 signaling is based on downlink control information (DCI) signaling.

17. The terminal device according to claim 14, wherein: The layer 3 signaling is based on the RRC reconfiguration message.

18. The terminal device according to claim 14, wherein: The notification unit transmits the measurement result to the base station device through any one of layer 1, layer 2, and layer 3 messages based on the instruction received from the base station device through the layer 3 signaling.

19. The terminal device according to claim 14, wherein: The notification unit receives a predetermined value related to the first quality from the base station device through the layer 3 signaling, which is used to determine through which message of layer 1, layer 2 and layer 3 the measurement result should be sent, and based on the first quality and the predetermined value, sends the measurement result to the base station device through a message of any one of layer 1, layer 2 and layer 3.

20. The terminal device according to claim 14, wherein: The setting information includes information for measuring, as the uplink signal, a reference signal received power (RSRP) of a sounding reference signal (SRS) of the uplink or a received signal strength indicator (RSSI) of a frequency range in which the uplink signal is transmitted.

21. The terminal device according to claim 14, wherein: The setting unit receives setting information for measuring the second quality of the downlink signal sent by the base station device or the other base station device from the base station device through layer 3 signaling, when the uplink signal sent by the terminal device to the base station device interferes with the downlink signal sent by the base station device or the other base station device, thereby setting the measurement of the second quality. The measuring unit receives an instruction to perform the measurement of the second quality or to stop the measurement being performed based on the setting information from the base station device through layer 1 or layer 2 signaling, thereby performing the instructed measurement. The notification unit notifies the base station apparatus of a result of the measurement of the second quality.

22. A control method, executed by a base station device, wherein: The control method comprises: Notifying the first terminal device through layer 3 signaling of setting information for measuring a first quality of an uplink signal that causes interference to a downlink signal received by the first terminal device and is sent by the second terminal device; as well as An instruction for executing the measurement of the first quality based on the setting information or for stopping the measurement in progress is transmitted to the first terminal device through layer 1 or layer 2 signaling.

23. A control method, executed by a terminal device, wherein: The control method comprises: When the terminal device receives a downlink signal from a base station device in connection, receiving setting information for measuring a first quality of an uplink signal transmitted by a second terminal device that causes interference to the downlink signal received by the terminal device from the base station device through layer 3 signaling, thereby setting the first quality measurement; receiving, from the base station device, an instruction to perform measurement of the first quality based on the setting information or to stop the measurement being performed, through layer 1 or layer 2 signaling, thereby performing the instructed measurement; as well as The measurement result is notified to the base station device.

24. A program for causing a computer to function as the base station device according to any one of claims 1 to 13.

25. A program for causing a computer to function as the terminal device according to any one of claims 14 to 21.

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