Terminal, base station, and radio communication system

Abstract

This terminal includes a receiving unit and a control unit. The receiving unit receives first information for configuring an uplink segment and a downlink segment in a plurality of segments, and second information relating to a SubBand Full Duplex (SBFD) configuration for configuring an SBFD segment in at least a part of the downlink segment configured by the first information. The control unit performs control to determine, in accordance with third information for configuring a first segment in which uplink communication can be performed within the SBFD segment and a second segment in which downlink communication can be performed within the SBFD segment, in accordance with the second information, the first segment and the second segment of the SBFD segment.

Description

Terminal, base station and wireless communication system

[0001] The present invention relates to a terminal, a base station, 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 traffic from mobile devices is expected to continue to grow.

[0003] In addition to traffic used by mobile terminals, for example, IoT (Internet of Things) services (for example, monitoring systems for transportation systems, smart meters, devices, etc.) are being deployed. Therefore, networks are required to support services with diverse requirements. In order to support such diverse services, for example, in communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (for example, Non-Patent Documents 1 to 14), standards are being formulated assuming support for many use cases classified as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communication).

[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] For example, a 3GPP working group is considering the introduction of the SBFD (Subband Full Duplex) technology (Non-Patent Document 15), which aims to improve uplink latency and expand coverage by configuring uplink resources on downlink symbols and / or flexible symbols.

[0006] 3GPP TS 37.324 V17.0.03GPP TS 37.340 V17.7.03GPP TS 38.201 V17.0.03GPP TS 38.202 V17.5.03GPP TS 38.211 V17.6.03GPP TS 38.212 V17.7.03GPP TS 38.213 V17.8.03GPP TS 38.214 V17.8.03GPP TS 38.215 V17.4.03GPP TS 38.300 V17.7.03GPP TS 38.321 V17.7.03GPP TS 38.322 V17.3.03GPP TS 38.323 V17.5.03GPP TS 38.331 V17.7.03GPP TR 38.858 V18.0.0

[0007] In SBFD, a base station can simultaneously transmit and receive signals by configuring an uplink (UL) subband for a downlink (DL) symbol. For example, a base station can receive a signal transmitted from a first terminal and a signal transmitted to a second terminal on the same symbol. On the other hand, a terminal can either transmit or receive on a single symbol. Therefore, a terminal configured for SBFD may have both DL and UL resources on a single symbol, making it unclear which control to prioritize for that symbol.

[0008] For example, if a base station transmits a signal in an interval where SBFD is set and a terminal prioritizes the transmission of a signal in that interval, the terminal will not be able to receive the signal transmitted from the base station, and as a result, the base station will need to retransmit the signal at a different time.

[0009] Therefore, a terminal configured with SBFD is required to set whether to control or prioritize DL or UL in a certain symbol. In other words, a base station and a terminal configured with SBFD are required to be able to identify the intervals in which DL and UL processing is performed in the interval in which SBFD is configured.

[0010] The disclosed technology has been developed in consideration of the above, and provides a method that makes it possible to identify sections in which DL processing is performed and sections in which UL processing is performed within a section in which SBFD is configured for a terminal in which SBFD is configured.

[0011] In one aspect, there is provided a terminal having: a receiving unit that receives first information that sets uplink sections and downlink sections in a plurality of sections; and second information regarding SubBand Full Duplex (SBFD) setting for setting up an SBFD section in at least a part of the downlink section set up by the first information; and a control unit that controls the terminal to determine, in accordance with the second information, a first section in which uplink communication can be performed within the SBFD section and a second section in which downlink communication can be performed within the SBFD section, in accordance with third information that sets up the first and second sections of the SBFD section.

[0012] It is possible to distinguish between a section in which DL processing is performed and a section in which UL processing is performed within a section in which SBFD is set for a terminal in which SBFD is set.

[0013] FIG. 1 is a diagram illustrating an example of a wireless communication system according to a first embodiment. FIG. 2 is a functional block diagram of a base station in the wireless communication system according to the first embodiment. FIG. 3 is a functional block diagram of a terminal in the wireless communication system according to the first embodiment. FIG. 4 is a diagram illustrating an example of an operation flow of a terminal according to the first embodiment. FIG. 5 is a diagram illustrating an example of setting an uplink segment and a downlink segment. FIG. 6 is a diagram illustrating an example of a sequence of a wireless communication system according to a second embodiment. FIG. 7 is a diagram illustrating an example of setting an uplink segment and a downlink segment for a terminal in which SBFD is set. FIG. 8 is a diagram illustrating an example of a slot format. FIG. 9 is a diagram illustrating an example in which the contents of the second embodiment are reflected in the specification (TS38.213). FIG. 10 is a diagram illustrating an example in which the contents of the second embodiment are reflected in the specification (TS38.213). FIG. 11 is a diagram illustrating an example in which the contents of the second embodiment are reflected in the specification (TS38.213). FIG. 12 is a diagram illustrating an example of a sequence of a wireless communication system according to a third embodiment. FIG. 13 is a diagram illustrating an example of setting an uplink segment and a downlink segment according to the third embodiment. Fig. 14 is a diagram showing an example of setting of an uplink section and a downlink section in the fourth embodiment. Fig. 15 is a diagram showing an example in which the contents of the fourth embodiment are reflected in a specification (TS38.213). Fig. 16 is a diagram showing an example of the hardware configuration of a base station. Fig. 17 is a diagram showing an example of the hardware configuration of a terminal.

[0014] The present embodiment will be described in detail below with reference to the drawings. The problems and examples in this specification are merely examples and do not limit the scope of the rights of the present application. In particular, even if the expressions used are different, the technology of the present application can be applied as long as they are technically equivalent, and do not limit the scope of the rights. Furthermore, each embodiment can be combined as appropriate within the scope of not causing any contradiction in the processing content.

[0015] Furthermore, the terms used and technical contents described in this specification may be those described in specifications and contributions as standards related to communications, such as 3GPP, as appropriate. Examples of such specifications include those described in Non-Patent Documents 1 to 14.

[0016] Hereinafter, embodiments of a base station, a terminal, a wireless communication system, and a communication method disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the disclosed technology is not limited to the following embodiments. First Embodiment

[0017] 1 is a diagram showing an example of a wireless communication system 1 according to the first embodiment. The wireless communication system 1 includes a base station 100, a terminal 200A, and a terminal 200B. The base station 100 forms a cell C10. The terminals 200A and 200B are present in the cell C10. When there is no need to distinguish between the terminals 200A and 200B, they will be simply referred to as terminal 200.

[0018] The base station 100 may be, for example, a small wireless base station such as a macro wireless base station or a pico wireless base station (including a micro wireless base station, a femto wireless base station, etc.), or may be a wireless base station of various scales, and may be referred to as a wireless communication device, a communication device, a transmitting device, etc. The terminal 200 may be, for example, a wireless terminal such as various devices having a wireless communication function, such as a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a personal computer, a vehicle, an airplane, a drone, or a device (sensor device, etc.) mounted on a robot, AV equipment, home appliances, office equipment, vending machines, other household equipment, industrial equipment, etc., and may be referred to as a wireless communication device, a communication device, a receiving device, a mobile station, etc.

[0019] The base station 100 is connected to a network device (a higher-level device or another base station) not shown in the figure via a wired connection. Note that the base station 100 may be connected to the network device wirelessly instead of via a wired connection.

[0020] The base station 100 may have a wireless communication function with the terminal 200 and a digital signal processing and control function separated into separate devices. In this case, the device having the wireless communication function may be called an RRH (Remote Radio Head), and the device having the digital signal processing and control function may be called a BBU (Base Band Unit). The RRHs may be installed extending from the BBU, and they may be connected by a wired connection such as optical fiber. Alternatively, they may be connected wirelessly. Instead of the aforementioned RRH and BBU, the base station 100 may be separated into, for example, a Central Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU). The DU may include, for example, a MAC (Media Access Control) layer function. The DU may also include, for example, a function of an RLC (Radio Link Control) layer. The RU includes at least an RF wireless circuit. The DU and RU may also be integrated into one unit.

[0021] On the other hand, the terminal 200 communicates with the base station 100 via wireless communication.

[0022] Next, the base station 100 will be described. Fig. 2 is a diagram showing an example of a functional configuration diagram of the base station 100. The base station 100 has a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

[0023] The wireless communication unit 110 is composed of a transmitting unit 111 and a receiving unit 112, and performs wireless communication with the terminal 200. Specifically, the transmitting unit 111 transmits to the terminal 200 downlink signals such as measurement signals (e.g., SSB, reference signals) that the terminal is to measure, random access procedure signals, RRC layer signals, downlink data signals, and downlink control signals.

[0024] The receiving unit 112 can receive uplink signals transmitted from the terminal 200, such as signals of a random access procedure, signals of an RRC layer, uplink data signals, and uplink control signals.

[0025] The control unit 120 controls the base station 100. Specifically, the control unit 120 can control the establishment of an RRC connection with the terminal 200, signal processing of signals received by the receiving unit 112, creation of transmission blocks (TBs), mapping of the transmission blocks to radio resources, etc. The control unit 120 can also control the setting of SBFD (Subband Full Duplex).

[0026] The storage unit 130 can store, for example, downstream data signals.

[0027] The communication unit 140 connects to a network device (e.g., a higher-level device or another base station device) via a wired or wireless connection to communicate with the device. Data signals received by the communication unit 140 and directed to the terminal 300 can be stored in the storage unit 130. The wireless communication unit 110 and the communication unit 140 may be collectively referred to as the communication unit.

[0028] Next, the terminal 200 will be described. Fig. 3 is a diagram showing an example of a functional configuration diagram of the terminal 200. As shown in Fig. 3, the terminal 200 includes a communication unit 210, a control unit 220, and a storage unit 230. These components are connected to each other so as to enable unidirectional or bidirectional input and output of signals and data. The communication unit 210 can be described as being divided into a transmission unit 211 and a reception unit 212.

[0029] The transmitter 211 transmits data signals and control signals by wireless communication via an antenna. Note that the antenna may be common for both transmission and reception. The transmitter 211 transmits uplink signals such as random access procedure signals, RRC layer signals, uplink data signals, and uplink control signals, for example.

[0030] The receiver 212 receives downlink signals such as a random access procedure signal, a downlink data signal, a downlink control signal, etc. transmitted from the base station 100. The received signals may also include reference signals used for channel estimation and demodulation, for example.

[0031] The control unit 220 controls the terminal 200. Specifically, the control unit 320 can control the establishment of an RRC connection with the base station 100, signal processing of signals received by the receiving unit 312, creation of transmission blocks (TBs), mapping of the transmission blocks to radio resources, etc. The control unit 220 can also perform control related to SBFD.

[0032] The storage unit 230 can store, for example, uplink data signals, and can also store configuration information (or setting information) related to wireless communication transmitted from the base station 100.

[0033] A method for setting SBFD in the first embodiment will be described.

[0034] The transmitter 111 of the base station 100 transmits to the terminal 200 first information, which is information for setting the uplink and downlink segments for each slot or the uplink and downlink segments for each symbol included in the slot, and second information, which is information related to the setting of SBFD. The terminal 200 receives the first information and the second information from the base station 100. Note that the first information and the second information may be transmitted in the same signal or in different signals. The first information may also be rephrased as information for setting the uplink and downlink segments for multiple segments.

[0035] An example of a process related to setting SBFD of terminal 200 will be described with reference to Fig. 4. Fig. 4 is a diagram showing an example of an operation flow of terminal 200. Note that the example of the process related to setting SBFD described in Fig. 4 is performed, for example, after receiving the first information and / or the second information.

[0036] The control unit 220 of the terminal 200 determines whether to set up SBFD (step S11). For example, if the receiving unit of the terminal 200 has received the second information, the control unit 220 determines whether to set up SBFD. If the receiving unit of the terminal 200 does not set up SBFD (step S11: No), the control unit 220 does not set up SBFD (step S13), and ends the process.

[0037] If SBFD is to be set (step S11: Yes), SBFD is set according to the second information (step S12). Note that SBFD can be set for downlink or flexibly set slots or symbols.

[0038] Here, the setting of SBFD will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of the setting of the uplink section and the downlink section.

[0039] 5A is a diagram showing uplink (UL) intervals and downlink (DL) intervals set in accordance with the first information. In FIG. 5A, the DL interval is set to frequency F1 and times S1 to S4, and the UL interval is set to frequency F1 and time S5. Note that times S1 to S5 may also be referred to as slots S1 to S5, respectively.

[0040] Fig. 5(B) is a diagram showing an example of SBFD settings. Fig. 5(B) shows that a part of the DL interval shown in Fig. 5(A) is set as the SBFD interval. Note that the SBFD interval indicates that a UL interval and a DL interval are included in a block formed by frequency F1 and one time period (e.g., time S2).

[0041] In Figure 5 (B), the portion of frequency F2 is the uplink section from time S2 to S4. Note that the portion of frequency F1 excluding frequency F2 from time S2 to S4 remains the DL section. Note that the portion of frequency F1 excluding frequency F2 may include a frequency that serves as a guard band where terminal 200 does not transmit or receive at the boundary with frequency F2.

[0042] Returning to the description of FIG. 4 , after SBFD configuration (step S12), the control unit 220 of the terminal 200 performs a first process using the third information. The first process is a process in which the terminal 200 sets a section in which uplink communication is possible and a section in which downlink communication is possible within the SBFD section. For example, times S2 and S3 in FIG. 5B are set as sections in which downlink communication is possible, and time S4 ​​is set as a section in which uplink communication is possible. In this case, frequency F2 is used for uplink communication during times S2 and S3, so downlink communication is performed over the portion of frequency F1 excluding frequency F2. Furthermore, frequency F2 is used for uplink communication during time S4, so uplink communication is performed over the portion of frequency F2. Within the SBFD section, the section in which uplink communication is possible is an example of a first section, and the section in which downlink communication is possible is an example of a second section. The third information may also be described as information that sets the first and second sections of the SBFD section.

[0043] The third information is information that sets a period during which uplink communication and downlink communication are performed for each of the times S2 to S4 or for each sub-time included in the times S2 to S4. For example, if the time is a slot, the sub-time indicates a symbol (for example, in the case of an SBFD period, it may be written as an SBFD symbol). In other words, the sub-time indicates a period shorter than the time. The third information may be transmitted from the base station 100 or may be stored in advance as predetermined information in the storage unit 230 of the terminal 200. The predetermined information is, for example, a rule that indicates that uplink communication or downlink communication is to be performed under specific conditions. The predetermined information is also stored in the storage unit 130 of the base station 100. The third information may use both the information transmitted from the base station 100 and the predetermined information.

[0044] Furthermore, in the SBFD section (for example, time S2-S4 in Figure 5 (B)), the frequency F2 at which upstream communication can be performed is different from the frequency F2 at which downstream communication can be performed (the portion of frequency F1 excluding F2).

[0045] As described above, in the first embodiment, the terminal 200 can set a section in which uplink communication can be performed and a section in which downlink communication can be performed, in accordance with the third information, within an SBFD section set in accordance with the second information received from the base station 100. In other words, the terminal 200 receives first information for setting uplink sections and downlink sections within a plurality of sections, and second information related to SBFD configuration for setting a Subband Full Duplex (SBFD) section in at least a portion of the downlink section set by the first information. The terminal 200 then determines a first section in which uplink communication can be performed within the SBFD section set in accordance with the second information, and a second section in which downlink communication can be performed within the SBFD section, in accordance with the third information for setting the first and second sections of the SBFD section. This allows the terminal to identify a section in which DL processing and a section in which UL processing are performed within a section in which SBFD is set for the terminal in which SBFD is set. Furthermore, the base station 100 can perform control so that the terminal 200 does not transmit a downlink signal during a section in which the terminal 200 performs UL processing. Embodiment 2

[0046] In the first embodiment, an example has been described in which the terminal 200 sets, in accordance with third information, a section in which uplink communication can be performed and a section in which downlink communication can be performed within the SBFD section set in accordance with second information received from the base station 100. In the second embodiment, an example will be described in which the base station 100 transmits third information to the terminal 200 to set, in the SBFD section, a section in which uplink communication can be performed and a section in which downlink communication can be performed. Note that in the second embodiment, the wireless communication system, the base station, and the terminal are the same as those in the first embodiment, and therefore description thereof will be omitted.

[0047] The flow of processing in the second embodiment will be described with reference to Fig. 6. Fig. 6 is a diagram showing an example of a sequence of a communication system in the second embodiment. In Fig. 6, the same processing as in Fig. 4 is assigned the same step number.

[0048] The transmitter 111 of the base station 100 transmits a first signal including first information to the terminal 200 (step S30). The receiver 212 of the terminal 200 receives the first signal (step S30). The transmitter 111 of the base station 100 transmits a second signal including second information to the terminal 200 (step S40). The receiver 212 of the terminal 200 receives the second signal (step S40). The first signal is, for example, a message of the RRC layer. The first signal is, for example, a System Information Block (SIB) (e.g., SIB1), an RRC Reconfiguration message, or an RRC Setup message. The second signal is, for example, a message of the RRC layer. Furthermore, the first signal is, for example, an SIB (e.g., SIB1), an RRC Reconfiguration message, or an RRC Setup message. Furthermore, the first information may be described as, for example, information included in servingcellConfigCommon, servingcellConfigCommonSIB, or tdd-UL-DL-ConfigCommon. Furthermore, the second information may be described as, for example, information included in ConfigSBFD. Furthermore, the first information and the second information may be common information within cell C10. For example, terminals 200A and 200B receive the same first information and second information. Furthermore, the first signal and the second signal may be combined and sent as a single signal. In short, the first information and the second information may be transmitted in the same signal.

[0049] The transmitter 111 of the base station 100 transmits a third signal including third information (step S50). The receiver 212 of the terminal 200 receives the third signal (step S50). Then, the control unit 220 of the terminal 200 performs the first process (step S20). Note that in FIG. 6, the process of step S12 described in FIG. 4 may be performed after the second signal is received or after the third signal is received. Furthermore, the third information may be different or the same for terminals 200A and 200B, for example. For example, if there are multiple terminals including terminals 200A and 200B, and the terminals are divided into a first group including terminals 200A and 200B and a second group including other terminals, the base station 100 may transmit the same third information to the same group. In this case, terminals 200A and 200B will receive the same third information.

[0050] Here, the third signal including the third information will be described. Note that the third signal will be described in the case of an RRC layer signal and the case of a downlink control channel (PDCCH).

[0051] First, the case where the third signal is an RRC layer signal will be described using Figure 7. Note that the RRC layer signal is, for example, an RRC Reconfiguration message, an RRC Setup message, or an RRC Establishment message. The third information may also be described as information included in ConfigDedicated, ServingCellConfig, and tdd-UL-DL-ConfigDedicated. Figure 7 is also a diagram showing an example of the configuration of the uplink and downlink segments of a terminal in which SBFD is configured. Note that in Figure 7, parts similar to those in Figure 5 are assigned the same reference numerals.

[0052] 7A shows an example of setting a section in which uplink communication is possible and a section in which downlink communication is possible within the SBFD section in terminal 200A, while FIG. 7B shows an example of setting a section in which uplink communication is possible and a section in which downlink communication is possible within the SBFD section in terminal 200B.

[0053] The base station 100 uses the third information to instruct the terminal 200A to perform downlink communication in interval T1 and to perform uplink communication in interval T2. Note that, for example, the third information may indicate only interval T1 in which downlink communication is to be performed, or may indicate only interval T2 in which uplink communication is to be performed. By transmitting such third information from the base station 100 to the terminal 200, the terminal 200A can identify that it will perform downlink communication in the block consisting of frequencies F3A and F3B and interval T1 during times S2 to S4, and that it will perform uplink communication in the block consisting of frequency F2 and interval T2.

[0054] Furthermore, the base station 100 uses the third information to instruct the terminal 200B to perform uplink communication in interval T1 and to perform downlink communication in interval T2. Note that, for example, the third information may indicate only interval T2 in which downlink communication is to be performed, or may indicate only interval T1 in which uplink communication is to be performed. By transmitting such third information from the base station 100 to the terminal 200B, the terminal 200B can perform downlink communication in the block formed by frequencies F3A and F3B and interval T1 during times S2 to S4, and can identify that it will perform uplink communication in the block formed by frequency F2 and interval T2.

[0055] Furthermore, for example, in section T1, the base station 100 can transmit a downlink signal to the terminal 200A at frequency F2 and can receive uplink signals at frequencies F3A and F3B.

[0056] Next, a case where the third signal is a downlink control channel (e.g., PDCCH: Physical Downlink Control CHannel) signal will be described with reference to FIG. 8 . Note that when the third signal is a downlink control channel, the third information corresponds to, for example, downlink control information (DCI: Downlink Control Information) or information included in the DCI. FIG. 8 is also a diagram showing an example of a slot format. Note that the slot format shown in FIG. 8 is an example of the content described in Non-Patent Document 7, but is not limited to this. For example, a new table may be defined separately for SBFD. Then, the table is stored in the storage unit 130 of the terminal 200 and the storage unit 130 of the base station 100.

[0057] When the third signal is a downlink control channel (e.g., PDCCH) signal, the index number (format in the figure) shown in Fig. 8 is selected as the third information and transmitted. Note that, for example, the same format may be specified for all slots (e.g., times S2 to S4 in Fig. 5) in the SBFD section, or a format may be specified for each slot.

[0058] For example, the base station 100 selects a format for each slot for the terminal 200A so that the portion corresponding to interval T1 shown in Figure 7(A) in the third information is the interval for downlink communication, and the portion corresponding to interval T2 is the interval for uplink communication.The base station 100 then notifies the terminal 200 of an index indicating the corresponding format as the third information.The terminal 200 then references the table stored in the storage unit 230 and the received index, and sets the intervals in which communication can be performed and the intervals in which downlink communication can be performed.

[0059] As described above, in the second embodiment, the terminal 200 can set a section in which uplink communication is possible and a section in which downlink communication is possible, in accordance with the third information received from the base station 100, within the SBFD section set in accordance with the second information received from the base station 100. Therefore, it is possible to distinguish between a section in which DL processing is performed and a section in which UL processing is performed within the section in which SBFD is set for the terminal in which SBFD is set. Furthermore, the base station 100 can perform control so that the terminal 200 does not transmit a downlink signal in a section in which UL processing is performed.

[0060] An example in which the content of the second embodiment is reflected in the description of a specification will be described below. Figures 9 to 11 are diagrams showing an example in which the content of the second embodiment is reflected in a specification (TS38.213).

[0061] Figure 9(A) is an example specifying that the symbols that can be changed are different between non-SBFD symbols and SBFD symbols. Figure 9(B) is an example specifying that in SBFD symbols, the UL part in tdd-UL-DL-ConfigurationCommon cannot be changed to DL. Figure 9(C) is an example specifying that in SBFD symbols, the DL / UL part in tdd-UL-DL-ConfigDedicated is downlink / uplink.

[0062] 9(D) and 10(A) show examples in which the condition part is added to the SBFD symbol to indicate that it is specified by tdd-UL-DL-ConfigurationDedicated.

[0063] 10B and 10C are examples of defining conditions under which symbols behave flexibly.

[0064] Fig. 11(A) is an example in which the conditions for symbols that cannot be rewritten by a slot format indicator (SFI) are modified and specified. Fig. 11(B) is an example in which the prerequisites for the operation when an SFI index other than 255 is received are modified and specified. Fig. 11(C) is an example in which the operation when an SFI is not received by a flexible symbol is modified and specified. Embodiment 3

[0065] In the first embodiment, an example was described in which the terminal 200 sets a section in which uplink communication can be performed and a section in which downlink communication can be performed in accordance with third information within an SBFD section set in accordance with second information received from the base station 100. In the second embodiment, an example was described in which the base station 100 transmits third information to the terminal 200 to set a section in which uplink communication can be performed and a section in which downlink communication can be performed within an SBFD section. In the third embodiment, an example is described in which a section in which uplink communication can be performed and a section in which downlink communication can be performed are set in accordance with the scheduling of downlink control information. Note that in the third embodiment, the wireless communication system, the base station, and the terminal are similar to those in the first and second embodiments, and therefore description thereof will be omitted.

[0066] The processing flow in the third embodiment will be described using Figures 12 and 13. Figure 12 is a diagram showing an example of a sequence of a wireless communication system in the third embodiment. Also, Figure 13 is a diagram showing an example of setting an uplink section and a downlink section in the third embodiment. Note that in Figure 12, the same processes as those in Figures 4 and 6 are given the same step numbers, and descriptions thereof will be omitted. Also, in Figure 13, the same parts as those in Figure 5 are given the same reference numerals.

[0067] 12(A) and 13(A) correspond to an example in which terminal 200 is scheduled to transmit an uplink signal, and FIG. 12(B) and 13(B) correspond to an example in which a downlink signal is scheduled.

[0068] First, an example in which terminal 200 is scheduled to transmit an uplink signal will be described with reference to FIG. 12(A) and FIG. 13(A).

[0069] Upon receiving the second signal, the receiver 212 of the terminal 200 sets an SBFD period as shown in Fig. 5(B). Thereafter, the receiver 212 of the terminal 200 receives a third signal including resource allocation information (e.g., UL Grant) for uplink signals from the base station 100 (step S52). The allocation information for uplink signals is an example of the third information.

[0070] Then, the control unit 220 of the terminal 200 performs a first process of setting the time position of the resource indicated by the resource allocation information as the section for performing uplink communication (step S20). Then, the transmission unit 211 of the terminal 200 transmits a signal in accordance with the resource allocation information (step S60).

[0071] A specific example will be described with reference to Fig. 13(A). At time S1, the receiver 212 of the terminal 200 receives downlink control information (DCI) corresponding to resource allocation information. Then, when the downlink control information indicates resource R1, the controller 220 of the terminal 200 determines the intervals corresponding to resource R1 (part of time S3 and part of time S4) as the intervals to be used for uplink communication.

[0072] Next, an example in which terminal 200 is scheduled to transmit a downlink signal will be described with reference to FIG. 12(B) and FIG. 13(B).

[0073] Upon receiving the second signal, the receiver 212 of the terminal 200 sets an SBFD period as shown in Fig. 5(B). Thereafter, the receiver 212 of the terminal 200 receives a third signal including downlink signal resource allocation information (e.g., DL assignment) from the base station 100 (step S54). The downlink signal allocation information is an example of the third information.

[0074] Then, the control unit 220 of the terminal 200 performs a first process of setting the time position of the resource indicated by the resource allocation information as the interval for downlink communication, and the interval for transmitting a response signal to the downlink signal as the interval for uplink communication (step S20). Then, the transmission unit 211 of the terminal 200 transmits the response signal to the downlink signal (step S62).

[0075] A specific example will be described using Figure 13 (B). At time S1, the receiving unit 212 of the terminal 200 receives downlink control information (DCI) corresponding to resource allocation information. Then, when the downlink control information indicates resource R2, the control unit 220 of the terminal 200 determines the interval corresponding to resource R2 (part of time S3 and part of time S4) as the interval to be used for downlink communication, and sets the resource (ACK / NACK) for transmitting a response signal as the interval to be used for uplink communication. Note that the resource (ACK / NACK) for transmitting the response signal may be indicated by the DCI, or the timing based on the downlink signal may be set in advance by another signal, or the specification may specify that transmission be based on the timing based on the downlink signal.

[0076] The transmissions in step S52 in Fig. 12A and step S54 in Fig. 12B may be performed simultaneously, i.e., two pieces of downlink control information may be transmitted in one downlink control signal.

[0077] As described above, in the third embodiment, the terminal 200 can set a section in which uplink communication is possible and a section in which downlink communication is possible, in accordance with the resource allocation information for uplink signals or the resource allocation information for downlink signals received from the base station 100, within the SBFD section set in accordance with the second information received from the base station 100. Therefore, it is possible to distinguish between a section in which DL processing is performed and a section in which UL processing is performed within the section in which SBFD is set for the terminal in which SBFD is set. Furthermore, the base station 100 can perform control so that the terminal 200 does not transmit downlink signals in a section in which UL processing is performed. Embodiment 4

[0078] In the first embodiment, an example was described in which the terminal 200 sets a section in which uplink communication can be performed and a section in which downlink communication can be performed in accordance with third information within an SBFD section set in accordance with second information received from the base station 100. In the second embodiment, an example was described in which the base station 100 transmits third information to the terminal 200 to set a section in which uplink communication can be performed and a section in which downlink communication can be performed within an SBFD section. In the third embodiment, an example was described in which a section in which uplink communication can be performed and a section in which downlink communication can be performed are set in accordance with scheduling of downlink control information. In the fourth embodiment, an example is described in which a section in which uplink communication can be performed and a section in which downlink communication can be performed are set in accordance with predetermined information (for example, a predetermined rule). Note that in the third embodiment, the wireless communication system, the base station, and the terminal are similar to those in the first to third embodiments, and therefore description thereof will be omitted.

[0079] The flow of processing in the fourth embodiment will be described with reference to Fig. 14. Fig. 14 is a diagram showing an example of setting of an uplink section and a downlink section in the fourth embodiment. In Fig. 14, the same parts as those in the figure are given the same reference numerals, and the description thereof will be omitted.

[0080] In embodiment 4, when performing the first processing, the terminal 200 applies a predetermined rule (or predetermined information) as third information to set sections in which upstream communication can be performed and sections in which downstream communication can be performed.

[0081] For example, assume that a random access occasion (RO) is set in terminal 200. Note that information about the RO setting is transmitted, for example, by being included in the first signal. This case will be described with reference to FIG. 14(A). As a predetermined rule, downlink communication is not permitted during the section in which RO is set (RO in FIG. 14(A)) and several symbols (N gaps) in the section in which RO is set. In other words, the section in which RO is set and the N gap are sections in which uplink communication is permitted (part of time S2 in FIG. 14(A)).

[0082] 14B illustrates a case where the timing at which the terminal 200 receives SSB from the base station 100 overlaps with the period in which SBFD is set. In this case, a predetermined rule is set so that uplink communication cannot be performed during the period in which the SSB is transmitted (SSB in FIG. 14B). In other words, the period in which the SSB is transmitted is set to a period in which downlink communication can be performed (part of time S3 in FIG. 14B).

[0083] Also, for example, if the timing at which terminal 200 receives SSB from base station 100 overlaps with the period in which SBFD is set, instead of the above, terminal 200 may exclude the time during which it receives the synchronization signal (SSB) (e.g., time S3 in Figure 14(B)) from the SBFD period, or may prohibit uplink communication during the time during which it receives SSB (e.g., time S3 in Figure 14(B)).

[0084] Also, for example, when terminal 200 obtains monitoring information for a control signal contained in SSB or SIB1, if the timing of detection of the control signal specified by the monitoring information overlaps with the section in which SBFD is set, terminal 200 may determine that the section in which downlink communication is performed is the timing at which the control signal is detected, and may prohibit uplink communication or may exclude it from the SBFD section.

[0085] Furthermore, for example, when the timing for transmitting an uplink signal (Su message 3 (Msg3)) is indicated by a random access response (RAR (Random Access Response) or message 2 (Msg2)) signal received by the terminal 200 after transmitting a random access signal (PRACH (Physical Random Access CHannel) or message 1 (Msg1)), and the timing overlaps with a section in which SBFD is set, the terminal determines that the section in which uplink communication is performed is the specified timing.

[0086] As described above, in the fourth embodiment, the terminal 200 can set a section in which uplink communication is possible and a section in which downlink communication is possible according to a predetermined rule within the SBFD section set in accordance with the second information received from the base station 100. Therefore, it is possible to distinguish between a section in which DL processing is performed and a section in which UL processing is performed within the section in which SBFD is set for the terminal in which SBFD is set. Furthermore, the base station 100 can perform control so that the terminal 200 does not transmit a downlink signal in a section in which UL processing is performed.

[0087] The contents described in the fourth embodiment can be combined with the contents described in the first to third embodiments as long as there is no contradiction. Also, for example, if the section in which uplink communication can be performed, set by the method of the second embodiment, becomes the section in which downlink communication can be performed as described in the fourth embodiment, the processing described in the fourth embodiment may be prioritized. In short, it may be determined that the predetermined rule has a higher priority in the settings, and the first processing according to the third information received from the base station 100 may be performed in a state in which the section in which uplink communication can be performed or the section in which downlink communication can be performed, set by the predetermined rule, is fixed.

[0088] An example in which the content of the fourth embodiment is reflected in the description of a specification will be described below. Fig. 15 is a diagram showing an example in which the content of the fourth embodiment is reflected in a specification (TS38.213).

[0089] FIG. 15 shows an example in which it is specified that a downlink cannot be set in a symbol in which RO is set. Fifth embodiment

[0090] In the first embodiment, an example was described in which the terminal 200 sets a section in which uplink communication can be performed and a section in which downlink communication can be performed in accordance with third information within an SBFD section set in accordance with second information received from the base station 100. In the second embodiment, an example was described in which the base station 100 transmits third information to the terminal 200 to set a section in which uplink communication can be performed and a section in which downlink communication can be performed within an SBFD section. In the third embodiment, an example was described in which a section in which uplink communication can be performed and a section in which downlink communication can be performed are set in accordance with scheduling of downlink control information. In the fourth embodiment, an example was described in which a section in which uplink communication can be performed and a section in which downlink communication can be performed are set in accordance with predetermined information (e.g., a predetermined rule). In the fifth embodiment, an example is described in which there is fourth information that sets uplink sections and downlink sections for symbols designated as flexible by the first information, and second information that sets up an SBFD section. Note that in the fifth embodiment, the wireless communication system, base station, and terminal are similar to those in the first to fourth embodiments, and therefore description thereof will be omitted.

[0091] In embodiment 5, an example is shown in which the terminal 200 sets an SBFD section when an uplink section and a downlink section are set by the fourth information for a symbol designated as flexible according to the first information received from the base station 100.

[0092] For example, if a symbol that is specified as either a downlink section or an uplink section by the fourth information in the terminal 200 is specified as an SBFD section by the second information, the terminal may prohibit that section from being an SBFD section.

[0093] Also, for example, if a symbol for which the terminal 200 has been assigned an uplink interval by the fourth information is designated as an SBFD interval by the second information, the terminal may prohibit that interval from being designated as an SBFD interval.

[0094] Furthermore, for example, when the second information specifies that a symbol for which a downlink interval or an uplink interval is specified by the fourth information to the terminal 200 is an SBFD interval, the terminal may set the interval as an SBFD interval. In this case, the transmission and reception direction in the SBFD interval may or may not follow the uplink interval or the downlink interval specified by the fourth information.

[0095] In addition, in embodiment 5, an example is also shown in which terminal 200 sets an uplink section and a downlink section using fourth information for a symbol designated as flexible according to first information received from base station 100 and for which an SBFD section is set using second information.

[0096] For example, when either the downlink section or the uplink section is specified to terminal 200 by the fourth information, the terminal may exclude these sections from the SBFD section.

[0097] Furthermore, for example, for a symbol for which a downlink interval is specified by the fourth information to the terminal 200, the terminal may exclude that interval from the SBFD interval.

[0098] Furthermore, for example, for a symbol for which a downlink interval or an uplink interval is specified by the fourth information to the terminal 200, the terminal does not need to exclude that interval from the SBFD interval. In this case, the transmission and reception direction in the SBFD interval may or may not follow the uplink interval or the downlink interval specified by the fourth information. Hardware configuration of each device in each embodiment

[0099] The hardware configuration of each device in the wireless communication system of each embodiment will be described with reference to FIGS.

[0100] Fig. 16 is a diagram showing an example of the hardware configuration of base station 100. As shown in Fig. 16, base station 100 has, as hardware components, for example, an RF (Radio Frequency) circuit 320 equipped with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, a memory 350, and a network IF (Interface) 360. The CPU is connected via a bus so as to enable input and output of various signals and data signals. The memory 350 includes at least one of a RAM (Random Access Memory) such as an SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), and a flash memory, and stores programs, control information, and data signals.

[0101] The correspondence between the functional configuration of the base station 100 shown in Fig. 2 and the hardware configuration of the base station 100 shown in Fig. 16 will be described. The transmitter 111 and receiver 112 (or wireless communication unit 110) are realized by, for example, an RF circuit 320, or an antenna 310 and an RF circuit 320. The control unit 120 is realized by, for example, a CPU 330, a DSP 340, a memory 350, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), and an LSI (Large Scale Integration). The storage unit 130 is realized by, for example, the memory 350. The communication unit 140 is realized by, for example, the network IF 360 .

[0102] It should be noted that base station 100 may generate a plurality of data signals to be transmitted in a plurality of subbands, and the filters that generate these signals may be configured independently for each subband.

[0103] Fig. 17 is a diagram showing an example of the hardware configuration of terminal 200. As shown in Fig. 17, terminal 200 has, as hardware components, an RF circuit 420 including, for example, an antenna 410, a CPU 430, a DSP 440, and a memory 450. Memory 450 includes at least one of a RAM such as an SDRAM, a ROM, and a flash memory, and stores programs, control information, and data signals.

[0104] The correspondence between the functional configuration of terminal 200 shown in Fig. 3 and the hardware configuration of terminal 200 shown in Fig. 17 will be described. The transmitter 211 and receiver 212 (or communication unit 210) are realized by, for example, an RF circuit 420, or an antenna 410 and an RF circuit 420. The control unit 220 is realized by, for example, a CPU 430, a DSP 440, a memory 450, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC, an FPGA, and an LSI. The storage unit 230 is realized by, for example, the memory 450.

[0105] The embodiments may be combined as appropriate within a range that does not cause any contradiction.

[0106] In each embodiment, examples of a base station and a terminal are described, but the disclosed technology is not limited to this and can be applied to various devices, such as electronic devices mounted on automobiles, trains, airplanes, artificial satellites, etc., electronic devices transported by drones, etc., robots, AV equipment, home appliances, office equipment, vending machines, and other household equipment.

[0107] Furthermore, although the embodiments have been described using fifth-generation mobile communications as an example, the application of the disclosed technology is not limited to this. For example, the disclosed technology may be applied to mobile communications of different generations, such as sixth and seventh generations.

[0108] 1 Wireless communication system 100 Base station C10 Cell 110 Wireless communication unit 111 Transmitter 112 Receiver 120 Control unit 130 Memory unit 140 Communication unit 200A 200B Terminal 210 Communication unit 211 Transmitter 212 Receiver 220 Control unit 230 Memory unit 310 Antenna 320 RF circuit 330 CPU 340 DSP 350 Memory 360 Network IF 410 Antenna 420 RF circuit 430 CPU 440 DSP 450 Memory

Claims

1. A terminal having: a receiving unit that receives first information that sets uplink sections and downlink sections in multiple sections; and second information regarding SBFD (SubBand Full Duplex) setting for setting up an SBFD section in at least a part of the downlink section set up by the first information; and a control unit that controls, in accordance with the second information, to determine a first section in which uplink communication can be performed within the SBFD section and a second section in which downlink communication can be performed within the SBFD section, in accordance with third information that sets up the first section and the second section of the SBFD section.

2. The terminal according to claim 1, wherein the frequency used for the upstream communication and the frequency used for the downstream communication are different in the SBFD section.

3. The terminal according to claim 1, wherein the receiving unit receives a signal including the third information from a base station.

4. The terminal according to claim 3, wherein the third information includes information indicating at least one of the first interval and the second interval, and the signal is a message of an RRC layer.

5. The terminal according to claim 3, wherein the third information is an index of a slot format indication, and the signal receives the third information via a downlink control signal.

6. The terminal according to claim 3, wherein the first information and the second information are common information within a cell, and the third information is individual information for the terminal.

7. The terminal according to claim 3, wherein the third information includes at least one of resource information for uplink communication and resource information for downlink communication; and when the third information includes resource information for uplink communication, the control unit sets the section within the SBFD section corresponding to the resource indicated by the resource information for uplink communication to the first section; and when the third information includes resource information for downlink communication, the control unit controls to set the section within the SBFD section corresponding to the resource indicated by the resource information for downlink communication to the second section, and to set the section within the SBFD section corresponding to the resource for transmitting a feedback signal for a signal transmitted on the resource indicated by the resource information for downlink communication to the first section.

8. The terminal according to claim 1, wherein, when a random access occasion is set within the SBFD interval, the control unit sets the interval in which the random access occasion is set as a first interval, and when a interval in which a synchronization signal is transmitted is present within the SBFD interval, the control unit sets the interval in which the synchronization signal is transmitted as a second interval.

9. A base station comprising: a transmitter that transmits first information that sets uplink sections and downlink sections in a plurality of sections, and second information regarding SBFD (SubBand Full Duplex) setting for setting up an SBFD section in at least a part of the downlink section set by the first information; and a receiver that determines, in accordance with the second information, a first section in which uplink communication can be performed within the SBFD section and a second section in which downlink communication can be performed within the SBFD section, and receives a signal transmitted in the first section, in accordance with third information that sets up the first section and the second section of the SBFD section.

10. A wireless communication system comprising: a base station that transmits first information for setting uplink sections and downlink sections in a plurality of sections, and second information regarding SBFD (SubBand Full Duplex) setting for setting an SBFD section in at least a part of the downlink section set by the first information; and a terminal that receives the first information and the second information, and controls the terminal to determine, in accordance with the second information, a first section in which uplink communication can be performed within the SBFD section and a second section in which downlink communication can be performed within the SBFD section, in accordance with third information for setting the first section and the second section of the SBFD section.

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