Terminal and communication method

Abstract

A terminal according to the present invention has: a communication unit that performs communication by means of half-duplex frequency division duplex; and a control unit that performs first processing performed for determining a signal to be received or transmitted when a downlink signal and an uplink signal overlap in the time domain in the communication, and second processing performed for determining a signal to be transmitted when a plurality of uplink signals overlap in the time domain in the communication. The control unit determines which of the first processing and the second processing is to be performed first, and the communication unit receives or transmits a signal based on a result of performing at least one of the first processing and the second processing.

Description

[Technical Field]

[0001] The present invention relates to a terminal and a communication method in a wireless communication system. [Background technology]

[0002] The 3GPP (3rd Generation Partnership Project) is currently studying a wireless communication system called 5G or NR (New Radio) (hereinafter, this wireless communication system will be referred to as "NR") in order to achieve even larger system capacity, even faster data transmission speeds, even lower latency in wireless sections, etc. In order to meet the requirements of NR, such as a large-capacity system, high-speed data transmission speeds, low latency, simultaneous connection of many terminals, low cost, and low power consumption, various wireless technologies and network architectures are being studied (for example, Non-Patent Document 1).

[0003] In addition, in 3GPP standardization, a new device type (hereinafter also referred to as "RedCapUE") is being considered as a Reduced Capability NR device, which has lower cost and complexity than an eMBB (enhanced Mobile Broadband) device or an URLLC (Ultra-Reliable and Low Latency Communications) device. To reduce complexity, RedCapUE is also being considered to support HD-FDD (Half-Duplex Frequency Division Duplex). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.300 V16.5.0 (2021-03) Summary of the Invention [Problem to be solved by the invention]

[0005] When RedCapUE supports HD-FDD, DL (Downlink) and UL (Uplink) are allocated to different carriers, are not transmitted simultaneously, and DL-UL switching time is assumed. Therefore, it is necessary to newly specify how to handle collisions between DL and UL channels, and how to handle collisions between UL channels.

[0006] The present invention has been made in view of the above points, and has as its object to establish communication in a wireless communication system when channel collision occurs. [Means for solving the problem]

[0007] According to the disclosed technology, a terminal is provided that has a communication unit that performs communication using half-duplex frequency division duplexing, and a control unit that performs a first process that is executed to determine a signal to receive or transmit when a downlink signal and an uplink signal overlap in the time domain in the communication, and a second process that is executed to determine a signal to transmit when a plurality of uplink signals overlap in the time domain in the communication, wherein the control unit determines which of the first process and the second process to execute first, and the communication unit receives or transmits a signal based on a result of execution of at least one of the first process and the second process. [Effects of the Invention]

[0008] According to the disclosed technology, communication can be established even when channel collision occurs in a wireless communication system. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram for explaining a duplexing method in FDD. [Figure 3] FIG. 10 is a diagram illustrating a processing example (1) when channels overlap. [Figure 4] FIG. 10 is a diagram illustrating a processing example (2) when channels overlap. [Figure 5] FIG. 10 is a diagram illustrating a processing example (1) when channels overlap in an embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating a processing example (2) when channels overlap in the embodiment of the present invention. [Figure 7] FIG. 10 is a diagram illustrating a processing example (3) when channels overlap in an embodiment of the present invention. [Figure 8] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 9] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 10] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0011] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are used as appropriate. However, the existing technologies are, for example, but not limited to, the existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (e.g., NR) unless otherwise specified.

[0012] Furthermore, in the embodiments of the present invention described below, terms used in existing LTE, such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel), are used. This is for convenience of description, and similar signals, functions, etc. may be referred to by other names. Furthermore, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used in NR are not necessarily designated as "NR-".

[0013] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, when radio parameters and the like are "configured," it may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] Fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot or a subslot, or a TTI may be a subframe.

[0017] Base station 10 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (component carriers)) to communicate with terminal 20. In carrier aggregation, one primary cell (PCell) and one or more secondary cells (SCells) are used.

[0018] The base station 10 transmits a synchronization signal, system information, and the like to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, on the NR-PBCH or PDSCH, and is also called broadcast information. As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 on the DL (Downlink) and receives control signals or data from the terminal 20 on the UL (Uplink). Note that, here, what is transmitted on a control channel such as the PUCCH or PDCCH is called a control signal, and what is transmitted on a shared channel such as the PUSCH or PDSCH is called data, but these names are merely examples.

[0019] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 may be referred to as a UE, and the base station 10 may be referred to as a gNB.

[0020] Terminal 20 can perform carrier aggregation, which aggregates multiple cells (multiple CCs) to communicate with base station 10. In carrier aggregation, one primary cell and one or more secondary cells are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0021] In 3GPP standardization, a new device type (hereinafter also referred to as "RedCapUE") is being considered as a Reduced Capability NR device, which has lower cost and complexity than an eMBB (enhanced Mobile Broadband) device or a URLLC (Ultra-Reliable and Low Latency Communications) device.

[0022] For example, the RedCapUE may support a smaller maximum bandwidth, a smaller number of receive branches, a smaller maximum number of MIMO layers, and a smaller modulation order. To reduce complexity, the RedCapUE is being considered to support HD-FDD (Half-Duplex Frequency Division Duplex).

[0023] Figure 2 is a diagram for explaining the duplexing method in FDD. As shown in Figure 2, in full-duplex FDD (full-duplex frequency division duplex), the DL carrier and the UL carrier are allocated to different frequencies and can transmit and receive simultaneously. On the other hand, in half-duplex FDD (half-duplex frequency division duplex), the DL carrier and the UL carrier are allocated to different frequencies and cannot transmit and receive simultaneously, requiring switching time between DL and UL. HD-FDD can eliminate the duplexer and use a switch and an additional filter instead.

[0024] In HD-FDD, it is necessary to consider the DL to UL switching time, UL to DL switching time, and DL / UL collision.

[0025] Table 1 shows an example of processing related to DL / UL collisions.

[0026] [Table 1]

[0027] As shown in Table 1, if a Scheduled-DL and a Configured-UL collide, at least a part of the Configured-UL is canceled if the timeline is satisfied. If a Configured-DL and a Scheduled-UL collide, a Scheduled-UL is transmitted. If a Configured-DL and a Configured-UL collide, this is an error case. If a Scheduled-DL and a Scheduled-UL collide, this is an error case. If an SSB and a Scheduled / Configured-UL collide, the Scheduled / Configured-UL is canceled. If a Scheduled / Configured-DL and a valid RO (Random Access Occasion) collide, the Scheduled / Configured-DL is not received. In the case of a collision due to DL / UL switching, i.e., during the transition time, no transmission / reception is expected.

[0028] Table 2 shows an example of priorities set between UL channels or UL signals.

[0029] [Table 2]

[0030] For example, two levels of priority may be set for UL transmission. The terminal 20 specifies the priority of UL transmission by a PriorityIndicator field included in DCI or a priority parameter of RRC.

[0031] As shown in Table 2, SR in PUCCH is set by the RRC parameter schedulingRequestPriority. HARQ-ACK in PUCCH is set by the Priority Indicator of DL-DCI when DynamicPDSCH is supported, and by the RRC parameter HARQ-ACK-Codebook-indicator-forSPS when SPS-PDSCH is supported. For P / SP (periodic / semi-persistent)-CSI, CSI in PUCCH is set to a fixed low priority. For A (aperiodic)-CSI or SP-CSI in PUSCH, CSI is set by the Priority Indicator of UL-DCI. For PUSCH, in the case of DynamicGrantPUSCH, it is set by the Priority Indicator of UL-DCI. For ConfiguredGrantPUSCH, it is set by the priority of the RRC parameter. For P / SP-SRS and A-SRS triggered by DCI format 2_3, a fixed low priority is set.

[0032] Fig. 3 is a diagram showing a processing example (1) when channels overlap. When two UL transmissions with the same priority overlap in the time domain in terminal 20, UCI and UCI or data are multiplexed into one UL channel as shown in Fig. 3. Multiplexing can improve efficiency.

[0033] Furthermore, when two UL transmissions of different priorities overlap in the time domain in terminal 20, UCI and UCI or data are prioritized, and the transmission with lower priority is dropped, as shown in Figure 3. If dropping occurs, there is a possibility of a large delay.

[0034] Figure 4 shows a processing example (2) for the case where channels overlap. When more than two UL transmissions overlap in the time domain, collisions may be resolved by steps 1)-4) shown below.

[0035] Step 1) Resolve collisions between low priority UL transmissions. Step 2) Resolve collisions between UL transmissions of different priorities, if any. Step 3) Resolve collisions between high priority UL transmissions. Step 4) Resolve collisions between UL transmissions of different priorities, if any.

[0036] In the example shown in Fig. 4, in step 1, a collision between a low-priority PUCCH (eMBB HARQ-ACK) and a low-priority PUSCH (eMBB data) is resolved, and the PUCCH (eMBB HARQ-ACK) is multiplexed onto the PUSCH (eMBB data). In the following step 2, a collision between UL transmissions of different priorities is resolved by prioritization, and the PUSCH (eMBB data & HARQ-ACK) is dropped. In the following step 3, a collision between a high-priority PUCCH (URLLC SR) and a high-priority PUCCH (URLLC HARQ-ACK) is resolved, and the PUCCH (URLLC SR) is multiplexed onto the PUCCH (URLLC HARQ-ACK).

[0037] The collision-related process shown in FIGS. 3 and 4 may be referred to as intra-UE prioritization.

[0038] Also, for example, if a semi-static DL symbol and SSB and UL transmission collide, the following two steps may be performed.

[0039] Step 1) Perform intra-UE prioritization including multiplexing and override to determine the final PUCCH / PUSCH. Step 2) The final PUCCH / PUSCH is cancelled if it collides with the semi-static DL symbol and SSB.

[0040] When RedCapUE supports HD-FDD, DL and UL are allocated to different carriers, are not transmitted simultaneously, and DL-UL switching time is assumed. Therefore, it is necessary to newly specify how to handle collisions between DL and UL channels, and how to handle collisions between UL channels.

[0041] Therefore, in a terminal 20 that supports HD-FDD, the processing order of DL / UL collision processing and intra-UE prioritization processing as shown in Table 1 for HD-FDD is determined.

[0042] Fig. 5 is a diagram showing a processing example (1) in the case where channels overlap in an embodiment of the present invention. As shown in Fig. 5, terminal 20 may perform intra-UE prioritization processing before DL / UL collision processing in HD-FDD. That is, as shown in Fig. 5, PUCCHs having the same priority may be multiplexed onto PUSCHs, and then DL / UL collision processing in HD-FDD may be performed. In the example of Fig. 5, the PUSCHs multiplexed with the PDSCHs do not overlap, so DL / UL collision processing in HD-FDD is not performed. Terminal 20 receives the PDSCHs and transmits the multiplexed PUSCHs.

[0043] Fig. 6 is a diagram showing a processing example (2) when channels overlap in an embodiment of the present invention. As shown in Fig. 6, terminal 20 may perform DL / UL collision processing in HD-FDD before performing intra-UE prioritization processing. That is, as shown in Fig. 6, Configured-PUCCH that overlaps with Scheduled-PDSCH is canceled. UCI of PUCCH is not multiplexed onto PUSCH. Terminal 20 receives PDSCH and transmits PUSCH.

[0044] Fig. 7 is a diagram showing a processing example (3) when channels overlap in an embodiment of the present invention. As shown in Fig. 7, terminal 20 does not need to assume that intra-UE prioritization processing will be performed on UL signals that are subject to DL / UL collision processing in HD-FDD. In other words, for Configured-PUCCH that overlaps with Scheduled-PDSCH, terminal 20 does not need to assume that PUSCH that is subject to intra-UE prioritization processing will be Scheduled or Configured.

[0045] The processing order to be applied may be different or the same depending on the combination of target DL / UL signal types. For example, in the case of collision between SSB and Sceduled / Condigured-UL, the processing order shown in Fig. 5 may be applied. Also, in the case of collision between Scheduled-DL and Configured-UL, the processing order shown in Fig. 6 may be applied. In other words, terminal 20 may determine the processing order of DL / UL collision processing and intra-UE prioritization processing based on the signal type.

[0046] According to the above embodiment, the terminal 20 can resolve channel overlap when the RedCap UE supports HD-FDD.

[0047] That is, communication can be established even when there is channel collision in a wireless communication system.

[0048] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only one of the functions of the embodiments.

[0049] <Base station 10> Fig. 8 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 8, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 8 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0050] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signal. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitter 110 also transmits the setting information, etc., described in the embodiments.

[0051] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads out the information from the storage device as needed. The control unit 140 performs, for example, resource allocation and overall control of the base station 10. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Furthermore, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0052] <Terminal 20> Fig. 9 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 9, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 9 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0053] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The transmitter 210 also transmits HARQ-ACK, and the receiver 220 receives the setting information and the like described in the embodiments.

[0054] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The control unit 240 performs overall control of the terminal 20. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. Note that the transmitting unit 210 and the receiving unit 220 may be called a transmitter and a receiver, respectively.

[0055] (Hardware configuration) The block diagrams (FIGS. 8 and 9) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or the multiple devices with software.

[0056] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0057] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 10 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0058] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0059] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0060] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0061] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 8 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 9 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0062] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0063] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0064] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0065] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0066] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0067] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0068] (Summary of the embodiment) As described above, according to an embodiment of the present invention, there is provided a terminal having a communication unit that performs communication using half-duplex frequency division duplexing, and a control unit that performs a first process that is performed to determine a signal to receive or transmit when a downlink signal and an uplink signal overlap in the time domain in the communication, and a second process that is performed to determine a signal to transmit when a plurality of uplink signals overlap in the time domain in the communication, wherein the control unit determines which of the first process and the second process to perform first, and the communication unit receives or transmits a signal based on a result of execution of at least one of the first process and the second process.

[0069] With the above configuration, the terminal 20 can resolve channel overlap when RedCapUE supports HD-FDD, i.e., can establish communication even when channel collision occurs in the wireless communication system.

[0070] The control unit may execute the second process before the first process. With this configuration, the terminal 20 can resolve channel overlap when RedCapUE supports HD-FDD.

[0071] The control unit may execute the first process before the second process. With this configuration, the terminal 20 can resolve channel overlap when RedCapUE supports HD-FDD.

[0072] The control unit may determine whether to execute the first process or the second process first based on the type of signal. With this configuration, the terminal 20 can resolve channel overlap when RedCapUE supports HD-FDD.

[0073] A communication method is provided in which a terminal executes a communication procedure for performing communication using half-duplex frequency division duplexing, a control procedure for performing a first process for determining a signal to receive or transmit when a downlink signal and an uplink signal overlap in the time domain in the communication, and a second process for determining a signal to transmit when a plurality of uplink signals overlap in the time domain in the communication, a procedure for determining which of the first process and the second process to execute first, and a procedure for receiving or transmitting a signal based on a result of execution of at least one of the first process and the second process.

[0074] With the above configuration, the terminal 20 can resolve channel overlap when RedCapUE supports HD-FDD, i.e., can establish communication even when channel collision occurs in the wireless communication system.

[0075] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0076] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0077] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0078] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0079] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0080] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0081] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0082] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0083] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0084] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0085] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0086] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0087] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0088] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0089] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0090] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0091] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0092] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0093] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0094] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0095] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0096] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0097] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0098] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0099] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0100] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0101] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0102] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0103] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0104] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0105] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0106] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0107] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0108] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0109] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0110] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0111] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0112] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0113] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0114] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0115] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0116] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0117] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0118] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0119] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0120] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0121] At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," and the like in this disclosure may be read as "BWP."

[0122] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0123] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0124] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0125] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0126] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0127] This international patent application claims priority to Japanese Patent Application No. 2021-068047, filed on April 13, 2021, the entire contents of which are incorporated herein by reference. [Explanation of symbols]

[0128] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. a communication unit that performs communication by half-duplex frequency division duplex; a control unit that executes a first process that is executed to determine a signal to be received or transmitted when a downlink signal and an uplink signal overlap in the time domain in the communication, and a second process that is executed to determine a signal to be transmitted when a plurality of uplink signals overlap in the time domain in the communication, the control unit determines which of the first process and the second process is to be executed first; The communication unit is a terminal that receives or transmits a signal based on a result of execution of at least one of the first process and the second process.

2. The terminal according to claim 1 , wherein the control unit executes the second process before the first process.

3. The terminal according to claim 1 , wherein the control unit executes the first process before the second process.

4. The terminal according to claim 1 , wherein the control unit determines whether to execute the first process or the second process first based on a type of signal.

5. a communication procedure for performing communication by half-duplex frequency division duplex; a control procedure for executing a first process for determining a signal to be received or transmitted when a downstream signal and an upstream signal overlap in the time domain in the communication, and a second process for determining a signal to be transmitted when a plurality of upstream signals overlap in the time domain in the communication; a step of determining whether the first process or the second process is to be executed first; A communication method in which a terminal executes a procedure for receiving or transmitting a signal based on a result of execution of at least one of the first process and the second process.

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