Base station device, terminal device, and wireless communication system

Abstract

Provided is a terminal device in a wireless communication system supporting first communication in which uplink communication and downlink communication are performed at the same timing using different resource blocks in the same slot and the same carrier, the terminal device comprising: a reception unit that receives setting information relating to measurement of a measurement signal from a base station device; and a control unit that, according to the setting information, controls execution or non-execution of alternative measurement processing for measuring a second measurement signal transmitted in a symbol in which the first communication is performed using a first measurement signal transmitted in a resource in which the first communication is not performed.

Description

Base station device, terminal device, and wireless communication system

[0001] The present invention relates to a base station device, a terminal device, and a wireless communication system.

[0002] In today's networks, traffic from mobile devices (smartphones and feature phones) accounts for the majority of network resources, and the traffic used by mobile devices is expected to continue to expand in the future.

[0003] In addition to traffic used by mobile devices, IoT (Internet of Things) services (e.g., transportation systems, smart meters, and monitoring systems for devices) are also being developed, and networks are being required to support services with diverse requirements. In order to accommodate such diverse services, communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (for example, Non-Patent Documents 11 to 28) include, for example, 4G (fourth-generation mobile communications) standard technologies (for example, Non-Patent Documents 1 to 10), as well as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable AND Low Latency Communication). The standards are being developed assuming support for many use cases classified as such.

[0004] In addition, in the working group of the 3rd Generation Partnership Project (3GPP (registered trademark)), an international standardization project, extension technologies for the above communication standards are currently being continuously studied and standardized.

[0005] 3GPP is studying Sub-band Full Duplex (SBFD) as one method for efficiently using radio resources. SBFD is a method in which the same slot and resource of Time Division Duplex (TDD) can be allocated to both uplink and downlink. In SBFD, a target slot is used as an uplink resource by some terminal devices, but as a downlink resource by other terminal devices. In the target slot, a base station device performs reception on the uplink resource and transmission on the downlink resource at the same timing.

[0006] Techniques relating to SBFD are described in the following prior art documents.

[0007] 3GPP TS 36.133 V17.10.03GPP TS 36.211 V17.3.03GPP TS 36.212 V17.1.03GPP TS 36.213 V17.5.03GPP TS 36.214 V17.0.03GPP TS 36.300 V17.4.03GPP TS 36.321 V17.5.03GPP TS 36.322 V17.0.03GPP TS 36.323 V17.2.03GPP TS 36.331 V17.4.03GPP TS 37.324 V17.0.03GPP TS 37.340 V17.5.03GPP TS 38.133 V17.10.03GPP TS 38.201 V17.0.03GPP TS 38.202 V17.3.03GPP TS 38.211 V17.5.03GPP TS 38.212 V17.5.03GPP TS 38.213 V17.6.03GPP TS 38.214 V17.6.03GPP TS 38.215 V17.3.03GPP TS 38.300 V17.5.03GPP TS 38.321 V17.5.03GPP TS 38.322 V17.3.03GPP TS 38.323 V17.5.03GPP TS 38.331 V17.5.03GPP TS 38.420 V17.2.03GPP TS 38.423 V17.5.0

[0008] However, in a communication system in which SBFD and non-SBFD (hereinafter sometimes referred to as non-SBFD) symbols are mixed, the method for setting and handling the transmission interval of CSI-RS (Channel State Information - Reference Signal) has not been determined.

[0009] Since the base station device may use the CSI report to control the radio resources for transmitting data, it is preferable to receive the CSI report of both SBFD and non-SBFD symbols. However, since the base station device needs to adjust the transmission timing of the CSI-RS to coincide with the appearance timing of the SBFD and non-SBFD symbols, the timing of the CSI-RS transmission is limited.

[0010] Therefore, one disclosure provides a terminal device, a base station device, and a communication system that can transmit CSI-RS without being restricted by the timing of SBFD symbols in an SBFD-compatible wireless communication system.

[0011] A terminal device in a wireless communication system compatible with first communication in which uplink and downlink communications are performed at the same timing using different resource blocks in the same slot and the same carrier, has a receiving unit that receives setting information regarding measurement of a measurement signal from a base station device, and a control unit that controls, in accordance with the setting information, the execution or non-execution of an alternative measurement process in which a first measurement signal transmitted in a resource not used for the first communication is used to measure a second measurement signal transmitted in a symbol used for the first communication.

[0012] One disclosure provides that in an SBFD-enabled wireless communication system, CSI-RS can be transmitted without being restricted by the timing of SBFD symbols.

[0013] FIG. 1 is a diagram showing an example of the configuration of a wireless communication system 10. FIG. 2 is a diagram showing an example of the configuration of a base station device 200. FIG. 3 is a diagram showing an example of the configuration of a terminal device 100. FIG. 4 is a diagram showing an example of CSI-RS of SBFD symbols and non-SBFD symbols. FIG. 5 is a diagram showing an example of a process for measuring CSI-RS of SBFD symbols using CSI-RS of non-SBFD symbols. FIG. 6 is a diagram showing an example of a process for measuring CSI-RS of SBFD symbols using CSI-RS of non-SBFD symbols. FIG. 7 is a diagram showing an example of the sequence of CSI report control processing. FIG. 8 is a diagram showing an example of a processing flowchart of CSI-RS reception processing S100. FIG. 9 is a diagram showing an example of information elements to be set. FIG. 10 shows an example of setting information elements. FIG. 11 is a diagram showing an example of sub-configuration settings for measuring both SBFD and non-SBFD using CSI-RS of non-SBFD symbols. FIG. 12 is a diagram showing an example of antenna port settings. FIG. 13 is a diagram showing an example of how the specifications according to the first embodiment are described. FIG. 14 is a diagram showing an example of how the specifications according to the first embodiment are described. FIG. 15 is a diagram showing an example of how the specifications according to the first embodiment are described. FIG. 16 is a diagram showing an example of how the specifications according to the first embodiment are described. FIG. 17 is a diagram showing an example of a processing flowchart for the interference measurement process S200 when receiving CSI-RS. FIG. 18 is a diagram showing an example of information elements to be set. FIG. 19 shows an example of information element settings. FIG. 20 is a diagram showing an example of settings in which signal measurement is permitted but interference measurement is not permitted in non-SBFD CSI measurement using SBFD CSI-RS. FIG. 21 is a diagram showing an example of how the specifications according to the second embodiment are described. FIG. 22 is a diagram showing an example of CSI control under time restriction. FIG. 23 is a diagram showing an example of a processing flowchart for the CSI report generation process S300. FIG. 24 is a diagram showing an example of how the specifications according to the third embodiment are described. 25 and 26 are diagrams illustrating examples of descriptions in the specifications according to the third embodiment.

[0014] [First Embodiment] A first embodiment will be described.

[0015] 1 is a diagram showing an example of the configuration of a wireless communication system 10. The wireless communication system 10 includes a base station device 200 and a terminal device 100. The wireless communication system 10 is a wireless communication system that supports SBFD.

[0016] The base station device 200 is a device that is wirelessly connected to the terminal device 100 and performs wireless communication, and is, for example, an eNodeB or a gNodeB. The base station device 200 supports SBFD and is compatible with communication generations such as 5G and NR (New Radio). The base station device 200 may be configured as a single device, or may be configured as multiple devices such as a CU (Central Unit) and DU (Distributed Unit).

[0017] The terminal device 100 is a communication device, such as a smartphone or a tablet terminal, that is wirelessly connected to the base station device 200 and transmits and receives data. The terminal device 100 supports SBFD.

[0018] In the wireless communication system 10, the base station device 200 notifies the terminal device 100 of radio resources compatible with SBFD. The terminal device 100 uses the radio resources in accordance with the instruction from the base station device 200.

[0019] Furthermore, in the wireless communication system 10, the base station device 200 transmits a CSI-RS (hereinafter, may be simply referred to as CSI), for example, periodically. The terminal device 100 receives the CSI-RS, stores the CSI-RS, and measures data (measurements) to be included in a CSI report. Note that hereafter, measuring the CSI-RS includes, for example, storing the CSI-RS and calculating values ​​(e.g., measurements) required when transmitting a CSI report.

[0020] 2 is a diagram showing an example of the configuration of the base station device 200. The base station device 200 includes a CPU (Central Processing Unit) 210, a storage 220, a memory 230, and a wireless communication circuit 250.

[0021] The storage 220 is an auxiliary storage device that stores programs and data, such as a flash memory, a hard disk drive (HDD), or a solid state drive (SSD). The storage 220 stores a wireless communication control program 221 and a CSI-RS control program 222.

[0022] The memory 230 is an area into which the programs stored in the storage 220 are loaded. The memory 230 may also be used as an area in which the programs store data.

[0023] The wireless communication circuit 250 is a device that performs wireless communication with the terminal device 100. The base station device 200 transmits and receives signals (messages) to and from the terminal device 100 via the wireless communication circuit 250.

[0024] The CPU 210 is a processor that loads programs stored in the storage 220 into the memory 230, executes the loaded programs, configures each unit, and realizes each process.

[0025] The CPU 210 executes a wireless communication control program to construct a transmitting unit and a notifying unit and perform wireless communication control processing. The wireless communication control processing is processing for establishing a wireless connection with the terminal device 100 and transmitting and receiving signals (messages) via the connected wireless. The base station device 200 controls wireless communication in the wireless communication control processing. The wireless communication control processing also includes processing for setting a slot configuration associated with the execution of SBFD and notifying the terminal device 100 of the slot configuration in SBFD.

[0026] The CPU 210 executes a CSI-RS control program to configure a transmission unit and a notification unit and perform CSI-RS control processing. The CSI-RS control processing is processing for controlling CSI-RS measurement and CSI report transmission performed by the terminal device 100. The CSI-RS control processing includes control processing for CSI reports in CSI-RS of non-SBFD and SBFD symbols, such as whether or not to allow measurement of SBFD CSI-RS by CSI-RS in non-SBFD symbols.

[0027] 3 is a diagram illustrating an example of the configuration of the terminal device 100. The terminal device 100 includes a CPU 110, a storage 120, a memory 130, and a wireless communication circuit 150.

[0028] The storage 120 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 120 stores a wireless communication program 121 and a CSI-RS measurement program 122.

[0029] The memory 130 is an area into which the programs stored in the storage 120 are loaded. The memory 130 may also be used as an area in which the programs store data.

[0030] The wireless communication circuit 150 is a device that performs wireless communication with the base station device 200. The terminal device 100 transmits and receives signals (messages) to and from the base station device 200 via the wireless communication circuit 150.

[0031] The CPU 110 is a processor that loads programs stored in the storage 120 into the memory 130, executes the loaded programs, configures each unit, and realizes each process.

[0032] The CPU 110 executes the wireless communication program 121 to configure a receiving unit and perform wireless communication processing. The wireless communication processing is processing for wirelessly connecting to the base station device 200 and performing communication.

[0033] The CPU 110 executes the CSI-RS measurement program 122 to configure a receiver and a controller and perform CSI-RS measurement processing. The CSI-RS measurement processing is processing for controlling measurement of CSI-RS of non-SBFD and SBFD symbols in accordance with instructions from the base station device 200. In CSI-RS measurement, the terminal device 100 uses, for example, CSI-RS of non-SBFD symbols and measures CSI-RS of SBFD symbols.

[0034] <CSI-RS of SBFD Symbols and Non-SBFD Symbols> Figure 4 is a diagram showing examples of CSI-RS of SBFD symbols and non-SBFD symbols. SBFD symbols contain a mixture of downlink resources and uplink resources. SBFD realizes communications in which uplink and downlink communications are performed at the same timing using different resource blocks in the same slot and the same carrier.

[0035] The CSI-RS of the SBFD symbol is transmitted using downlink resources, and the SBFD uplink resources are used as uplink resources as allocated. Therefore, the terminal device 100 cannot receive (does not receive) a partial signal of the CSI-RS transmitted at the timing when the uplink resources are allocated. As shown in FIG. 4 , in order to steadily transmit the CSI-RS using both the SBFD symbol and the non-SBFD symbol, the transmission timing of the CSI-RS is limited.

[0036] <CSI-RS measurement processing> The terminal device 100, for example, independently measures the CSI-RS (measurement signal) of the SBFD symbol and the non-SBFD symbol. In order to reduce restrictions on the transmission timing of the CSI-RS, the terminal device 100 uses the CSI-RS (first measurement signal) of the non-SBFD symbol and performs measurement (alternative measurement) of the CSI-RS of the SBFD symbol (measurement item included in the CSI report of the SBFD symbol) (second measurement signal). However, since the terminal device 100 performs an alternative measurement using different signals, that is, measuring the CSI-RS of the SBFD symbol with the CSI-RS of the non-SBFD symbol, the following processing is performed to improve measurement accuracy.

[0037] <1. Limitation of Measurement Portion> Fig. 5 is a diagram showing an example of a process for measuring the CSI-RS of an SBFD symbol using the CSI-RS of a non-SBFD symbol. The terminal device 100 recognizes the allocation pattern of the SBFD symbols (such as the frequency bands and number of symbols of the uplink resources and downlink resources). Therefore, the terminal device 100 excludes the frequency bands (resource blocks) corresponding to the uplink resources in the SBFD symbols from the measurement targets. For example, in Fig. 5, the terminal device 100 measures measurement targets B1 and B2, which are frequency bands corresponding to the uplink resources in the SBFD symbols, of the CSI-RS of the non-SBFD symbols as the CSI-RS of the SBFD symbols. This makes it possible to measure the CSI-RS of the SBFD symbols using the CSI-RS of the non-SBFD symbols.

[0038] <2. Limitation of Antenna Ports> Figure 6 is a diagram showing an example of a process for measuring the CSI-RS of an SBFD symbol using the CSI-RS of a non-SBFD symbol. For example, when transmitting the CSI-RS using the non-SBFD symbol, the base station device 200 uses all antenna ports. On the other hand, in the SBFD symbol, the base station device 200 may use antenna ports for receiving uplink resources, for example, and therefore transmit the CSI-RS using some of the antenna ports. Therefore, when measuring the CSI-RS of an SBFD symbol using the CSI-RS of a non-SBFD symbol, the terminal device 100 measures only the CSI-RS transmitted via the antenna port used when transmitting the CSI-RS with the SBFD symbol. For example, in Figure 6, the CSI-RS of the non-SBFD symbol corresponding to the CSI-RS of the SBFD symbol (shaded area) is measured.

[0039] <3. Consideration of Power Density Difference> A difference may occur in the power density of the transmission power between the CSI-RS of a non-SBFD symbol and the CSI-RS of an SBFD symbol when they are transmitted from the base station device 200. Therefore, when measuring the CSI-RS of an SBFD symbol using the CSI-RS of a non-SBFD symbol, the terminal device 100 performs the measurement while taking the power density difference into consideration.

[0040] <CSI Report Control Processing> A description will be given of the CSI report control processing in the wireless communication system 10. The CSI report control processing includes a CSI-RS transmission processing by the base station device 200, and a CSI-RS measurement processing and a CSI report transmission processing by the terminal device 100. Note that the message names in the following sequence are examples, and messages other than the examples may be used as long as they can include similar information elements.

[0041] 7 is a diagram showing an example of a sequence of a CSI report control process. The base station apparatus 200 transmits an RRC Configuration to the terminal apparatus 100 (S10). The RRC Configuration includes information elements related to CSI configuration, such as CSI-RS measurement and CSI report transmission.

[0042] The base station device 200 transmits the CSI-RS to the terminal device 100 (S11). The CSI-RS is transmitted using, for example, an SBFD symbol or a non-SBFD symbol.

[0043] Upon receiving the CSI-RS, the terminal device 100 measures the CSI-RS (S12). The terminal device 100 may also store the CSI-RS signal in an internal memory. Measurement items are included in, for example, the RRC Configuration.

[0044] The terminal device 100 generates and transmits a CSI report at the CSI report transmission timing (S13). The CSI report may include either an SBFD symbol or a non-SBFD symbol, or both. The transmission timing and transmission content (measurement content) of the CSI report are included in, for example, the RRC Configuration.

[0045] Upon receiving the CSI report, the base station device 200 uses radio resources taking into consideration the radio wave conditions and the like, and transmits data to the terminal device 100 (S14).

[0046] <CSI-RS Reception Processing> The CSI-RS reception processing S100 will be described. The CSI-RS reception processing S100 is processing that is performed when the terminal device 100 receives a CSI-RS.

[0047] 8 is a diagram showing an example of a processing flowchart of the CSI-RS reception process S100. The terminal device 100 checks whether the received CSI-RS is a non-SBFD symbol (S100-1).

[0048] If the received CSI-RS is an SBFD symbol (No in S100-1), the terminal device 100 performs SBFD CSI measurement (S100-5) and ends the process.

[0049] On the other hand, if the received CSI-RS is a non-SBFD symbol (Yes in S100-1), the terminal device 100 checks whether or not it is set to perform non-SBFD CSI measurement (S100-2).

[0050] If the terminal device 100 is configured to perform non-SBFD CSI measurement (Yes in S100-2), the terminal device 100 performs non-SBFD CSI measurement (S100-3) and ends the process.

[0051] <Information Element Setting> The setting of information elements will be described. Fig. 9 is a diagram showing examples of information elements to be set. The information elements are included in, for example, Report Config included in RRC Configuration. Fig. 10 shows an example of setting information elements.

[0052] SBFDRestrictionForChannelMeasurements indicates whether to measure CSI for SBFD / non-SBFD.

[0053] SBFDChannelMeasurementOnNoSBFD indicates whether or not CSI measurement for SBFD is permitted using CSI-RS of non-SBFD symbols. For example, when this information element is set, it indicates that it is permitted.

[0054] DLsubbandCQI indicates that only downlink resources (subbands) are subject to measurement on the frequency domain in SBFD CSI measurement. For example, it indicates that the measurement portion is limited as shown in FIG. 5. Note that a wideband is set in non-SBFD CSI measurement.

[0055] The portSubsetBitmap specifies the antenna port number used to transmit the CSI-RS in the SBFD symbol. For example, the number (identifier) ​​of the antenna port to be measured shown in FIG. 6 is specified.

[0056] PowerOffsetSBFD indicates the power offset value of the SBFD symbol relative to the non-SBFD symbol. The power offset value indicates, for example, the power density difference.

[0057] 11 is a diagram showing an example of subconfiguration settings for measuring both SBFD and non-SBFD using CSI-RS of non-SBFD symbols. The base station device 200 can instruct to measure both by setting multiple subconfigurations in one Report Config.

[0058] Fig. 12 is a diagram showing an example of antenna port settings. Fig. 12 shows an example in which 8 of 16 antenna ports are used for CSI-RS transmission. 16 bits indicate each antenna port, with 1 indicating an antenna port that is used and 0 indicating an antenna port that is not used.

[0059] 13 to 16 are diagrams showing examples of specifications according to the first embodiment. Each specification is described in, for example, the 3GPP specification "TS38.214."

[0060] The specifications state, for example, that SBFD or non-SBFD CSI measurement is performed ( FIG. 13 ). The specifications also specify that when SBFDChannelMeasurementOnNoSBFD is set, the frequency range and antenna port are adjusted to CSI transmission of SBFD symbols ( FIG. 13 ).

[0061] The specification states that a variable for measuring only downlink resources (DL subband) will be added to the frequency-related settings (FIG. 14).

[0062] The specifications describe the setting of measuring only some antenna ports (FIG. 15).

[0063] The specification document describes changes to the specifications for the subconfiguration (FIG. 16).

[0064] [Second Embodiment] A second embodiment will be described. In the second embodiment, the terminal device 100 handles the measurement of interference, which is one of the CSI measurement items, independently from the measurement of other measurement items (hereinafter, sometimes referred to as signal measurement). Interference includes, for example, cross link interference (CLI) between terminal devices occurring in SBFD slots and self-interference. Therefore, the interference measurement values ​​may differ between SBFD symbols and non-SBFD symbols. Therefore, in the second embodiment, the base station device 200 controls whether or not to permit measurement of SBFD symbol interference using non-SBFD symbols.

[0065] 17 is a diagram showing an example of a processing flowchart of the interference measurement process S200 when receiving CSI-RS. Note that the signal measurement is assumed to be similar to the processing flowchart in FIG.

[0066] The terminal device 100 checks whether the received CSI-RS is a non-SBFD symbol (S200-1).

[0067] If the received CSI-RS is an SBFD symbol (No in S200-1), the terminal device 100 performs interference measurement of the CSI for SBFD (S200-5) and ends the process.

[0068] On the other hand, if the received CSI-RS is a non-SBFD symbol (Yes in S200-1), the terminal device 100 checks whether or not it is set to perform interference measurement of non-SBFD CSI (S200-2).

[0069] If the terminal device 100 is configured to perform interference measurement of CSI for non-SBFD (Yes in S200-2), it performs interference measurement of CSI for non-SBFD (S200-3) and ends the process.

[0070] <Information Element Setting> The setting of information elements will be described. Fig. 18 is a diagram showing examples of information elements to be set. The information elements are included in, for example, Report Config included in RRC Configuration. Fig. 19 shows an example of setting information elements.

[0071] SBFDRestrictionForInterferenceMeasurements indicates whether CSI for SBFD / non-SBFD is to be interference measured.

[0072] SBFDInterferenceMeasurementOnNoSBFD indicates whether interference measurement of CSI for SBFD is permitted in CSI-RS of non-SBFD symbols. For example, when this information element is set, it indicates that interference measurement is permitted.

[0073] Note that the permission or prohibition of the interference measurement is a setting separate from the signal measurement. For example, various settings are possible for non-SBFD CSI measurement using SBFD CSI-RS, such as allowing both signals and interference, allowing only signals, or not allowing both. Figure 20 is a diagram showing a setting example in which signal measurement is permitted but interference measurement is not permitted in non-SBFD CSI measurement using SBFD CSI-RS.

[0074] 21 is a diagram showing an example of specifications according to the second embodiment. Each specification is described in, for example, the 3GPP specification "TS38.214."

[0075] The specifications state, for example, whether interference measurement is performed or not in CSI measurement for SBFD or non-SBFD (FIG. 21).

[0076] [Third Embodiment] A third embodiment will be described below. In the third embodiment, the base station apparatus 200 controls CSI reporting in consideration of time restriction.

[0077] 22 is a diagram showing an example of CSI control under time restriction. In time restriction, a process is performed to exclude CSI-RS for a predetermined period from the targets of a CSI report. The terminal device 100 does not use, in the CSI report, measurement values ​​of the CSI-RS received within a predetermined period from the transmission timing of the CSI report.

[0078] In FIG. 22, CSI-RSC4 within a predetermined period from the timing when CSI report C5 is transmitted is excluded from the targets of the CSI report.

[0079] When a time restriction is set, the terminal device 100 generates a CSI report using the latest CSI-RS, excluding a CSI-RS within a predetermined period. When a time restriction is not set, the terminal device 100 selects one or more CSI-RS using some criterion, excluding a CSI-RS within a predetermined period, and generates a CSI report using the selected CSI-RS.

[0080] For example, when timeRestrictionForChannelMeasurements is set, the terminal device 100 transmits a CSI report targeting the latest CSI-RSC3 among the target CSI-RSs.

[0081] For example, if timeRestrictionForChannelMeasurements is not set, the terminal device 100 selects a CSI-RS (any one of C1 to C3 or a combination of multiple CSI-RS) from the target CSI-RSs and transmits a CSI report targeting the selected CSI-RS.

[0082] <CSI report generation process S300> A description will be given of the CSI report generation process S300 in the terminal device 100. The CSI report generation process S300 is a process that is performed, for example, at the timing of transmitting a CSI report.

[0083] 23 is a diagram showing an example of a processing flowchart of the CSI report generation process S300. The terminal device 100 checks whether the CSI report is for SBFD (S300-1).

[0084] If the CSI report is for SBFD (Yes in S300-1), the terminal device 100 extracts the CSI-RS for SBFD (S300-2). Note that the extraction in this processing flowchart includes, for example, the CSI-RS signal stored in memory and the CSI-RS measurement value.

[0085] On the other hand, if the CSI report is not for SBFD (No in S300-1), the terminal device 100 extracts the CSI-RS for non-SBFD (S300-3).

[0086] Next, the terminal device 100 checks whether or not a time restriction is set (S300-4).

[0087] If there is a time restriction setting (Yes in S300-4), the terminal device 100 selects the latest CSI-RS from the extracted CSI (S300-5).

[0088] On the other hand, if no time restriction is set (No in S300-4), the terminal device 100 selects any (one or more) CSI-RS from the extracted CSI (S300-6).

[0089] The terminal device 100 generates a CSI report including the measurement values ​​of the selected CSI-RS and values ​​calculated using the selected CSI-RS (S300-7), and ends the processing.

[0090] <Regarding SBFD CSI Reports> In the wireless communication system 10, two types of SBFD CSI reports exist: those measured with non-SBFD symbols (SBFD measurements) and those measured with SBFD symbols (non-SBFD measurements). In the CSI report generation process S300, for example, if a measurement value from SBFD measurement exists, the measurement value may be selected with priority over the measurement value from non-SBFD measurement. Furthermore, if a measurement value from SBFD measurement does not exist, the measurement value from non-SBFD measurement may be used.

[0091] The measurement value of the SBFD CSI-RS measured with the CSI-RS of the SBFD symbol may not be prioritized when selecting the latest CSI (when time restriction is set), and the time series (being the latest) may be prioritized. Furthermore, the measurement value of the SBFD CSI-RS may not be particularly distinguished as to whether it was measured with an SBFD symbol or a non-SBFD symbol (it may be stored without being distinguished).

[0092] Furthermore, interference may be handled independently of signal measurement, as in the second embodiment. In this case, the priorities of signal measurement and interference measurement may also be handled independently. For example, the priority of whether measurement is performed using an SBFD symbol or a non-SBFD symbol may be different for signal measurement and interference measurement. For example, no distinction may be made between SBFD and non-SBFD for signal measurement, but priority may be given to measurement using an SBFD symbol for interference measurement.

[0093] 24, 25, and 26 are diagrams showing examples of specifications according to the third embodiment. Each specification is described in, for example, the 3GPP specification "TS38.214."

[0094] The specifications may include, for example, definitions of CSI-RS for SBFD symbols and non-SBFD symbols.

[0095] The specifications also state that when timeRestrictionForInterferenceMeasurements (a variable that sets whether or not to apply time restriction to interference) is "not configured", only the CSI-Reference resource or an earlier CSI-RS is taken into consideration for the interference component; and when timeRestrictionForInterferenceMeasurements is "configured", only the latest value of the CSI-Reference resource or an earlier CSI-RS is taken into consideration for the interference component.

[0096] In addition, the specification states that, with respect to a valid slot in the definition of a CSI reference resource corresponding to a predetermined period in the time restriction, the downlink and flexible symbol are to be defined as SBFD and non-SBFD symbols, respectively, when measuring SBFD CSI and non-SBFD CSI, respectively.

[0097] Other Embodiments The first to third embodiments may be combined with each other. For example, in the third embodiment, the measurement of the interference component in the second embodiment may be handled independently of the measurement of the signal.

[0098] In addition, the "measurement of signals" and "measurement of interference" in each embodiment can be replaced with, for example, "storage of signals," and the terminal device 100 can calculate measurements (e.g., received power, interference value) required for a CSI report based on the stored signals.

[0099] Furthermore, the measurement of the CSI-RS in the non-SBFD symbol may be performed by both the CSI measurement for SBFD and the CSI measurement for non-SBFD. The terminal device 100 may store the measurement results of the CSI measurement for SBFD and the CSI measurement for non-SBFD, or may store the CSI-RS signal and calculate the CSI value when transmitting a CSI report.

[0100] Furthermore, all or some of the limitations on measurement areas, limitations on antenna ports, and consideration of power density differences may be implemented.

[0101] 10: Wireless communication system 100: Terminal device 110: CPU 120: Storage 121: Wireless communication program 122: CSI-RS measurement program 130: Memory 150: Wireless communication circuit 200: Base station device 210: CPU 220: Storage 221: Wireless communication control program 222: CSI-RS control program 230: Memory 250: Wireless communication circuit

Claims

1. A terminal device in a wireless communication system supporting a first communication in which uplink and downlink communications are performed at the same timing using different resource blocks in the same slot and the same carrier, the terminal device having: a receiving unit that receives configuration information regarding measurement of a measurement signal from a base station device; and a control unit that controls, in accordance with the configuration information, the execution or non-execution of an alternative measurement process in which a first measurement signal transmitted in a resource not used for the first communication is used to measure a second measurement signal transmitted in a symbol used for the first communication.

2. The terminal device according to claim 1, wherein the setting information includes information on a frequency band used as an uplink signal in the first communication, and the control unit, in the alternative measurement process, measures the second measurement signal by excluding the frequency band used as the uplink signal from the first measurement signal.

3. The terminal device of claim 1, wherein the setting information includes information regarding an antenna port used to transmit the second measurement signal, and the control unit measures, in the alternative measurement process, a signal among the first measurement signals that corresponds to the antenna port used to transmit the second measurement signal.

4. The terminal device according to claim 1, wherein the setting information includes information regarding a power density difference between the transmission power of the second measurement signal and the first measurement signal, and the control unit performs the alternative measurement processing taking into account the power density difference.

5. The terminal device of claim 1, wherein the alternative measurement process includes measuring interference of the second measurement signal and measuring other than the interference of the second measurement signal, and whether or not to perform the measurements other than the interference and whether or not to perform the measurements of the interference are included in the setting information, and the control unit determines whether or not to perform the measurements other than the interference and whether or not to perform the measurements of the interference in the alternative measurement process in accordance with the setting information.

6. The terminal device of claim 1, wherein when the control unit notifies the base station device of the measurement results of the second measurement signal, if the control unit has measurement results obtained by measuring the second measurement signal using the second measurement signal, the control unit notifies the base station device of the measurement results in priority to the measurement results in the alternative measurement process.

7. The terminal device of claim 6, wherein when the control unit notifies the base station device of the latest measurement result of the second measurement signal prior to a predetermined period of time, the control unit notifies the base station device even if the latest measurement result of the second measurement signal is a measurement result in the alternative measurement process.

8. The terminal device according to claim 1, wherein the first communication includes Sub-band Full Duplex (SBFD).

9. The terminal device according to claim 1, wherein the measurement signal includes a CSI-RS (Channel State Information - Reference Signal) transmitted by the base station device.

10. The terminal device according to claim 6, wherein the measurement signal includes a CSI-RS (Channel State Information - Reference Signal) transmitted by the base station device, and the notification includes a CSI report.

11. The terminal device according to claim 5, wherein the measurements other than the interference include the received power of the measurement signal.

12. A base station device in a wireless communication system supporting a first communication in which uplink and downlink communications are performed at the same timing using different resource blocks in the same slot and the same carrier, the base station device having: a notification unit that transmits configuration information regarding measurement of a measurement signal to a terminal device; and a transmission unit that transmits the measurement signal, the configuration information including information regarding the execution or non-execution of an alternative measurement process in which the terminal device uses a first measurement signal transmitted with a symbol that does not perform the first communication to measure a second measurement signal transmitted with a symbol that performs the first communication.

13. A wireless communication system having a base station device and a terminal device, which supports a first communication in which uplink and downlink communications are performed at the same timing using different resource blocks in the same slot and the same carrier, wherein the base station device transmits configuration information regarding measurement of a measurement signal to the terminal device, the terminal device receives the configuration information, the base station device transmits the measurement signal, and the terminal device controls, in accordance with the configuration information, the execution or non-execution of an alternative measurement process in which a first measurement signal transmitted with a symbol that does not perform the first communication is used to measure a second measurement signal transmitted with a symbol that performs the first communication.

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