Terminal and communication method

Abstract

A terminal is provided with: a transmission unit that, when a first RAT and a second RAT, which are a first radio access technology, are operated on the same frequency band, transmits, to a network, information indicating which method supports reception of a downlink control channel candidate of the second RAT including a symbol in which a reference signal of the first RAT is arranged; a reception unit that receives, from a network, radio resource control (RRC) signaling indicating which of the methods is activated; and a control unit that monitors the downlink control channel candidates including the symbols using a method activated by the RRC signaling.

Description

Technical Field

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

[0002] In NR (New Radio) (also called "5G"), which is the successor system to LTE (Long Term Evolution), technologies that meet the requirements such as large-capacity systems, high data transmission speeds, low latency, simultaneous connection of multiple terminals, low costs, and power saving are being studied (for example, non-patent document 1).

[0003] Dynamic spectrum sharing (DSS) technology (e.g., non-patent document 2) is being studied to enable LTE and NR to coexist in the same frequency band. By allowing different RATs (Radio Access Technology) to coexist on a single carrier, it is possible to flexibly respond to business needs during system generation switching. Furthermore, in order to increase the capacity of NR-PDCCH (Physical Downlink Control Channel) in DSS, NR-PDCCH reception on symbols configured with LTE-CRS (Cell specific reference signal) is being studied (e.g., non-patent document 3).

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 38.300 V17.0.0 (2022-03)

[0007] Non-patent document 2: 3GPP TSG RAN Meeting #86RP-192678 (2019-12)

[0008] Non-patent document 3: 3GPP TSG RAN Meeting #94e RP-213575 (2021-12)

[0009] Non-patent document 4: 3GPP TS 38.213 V17.1.0 (2022-03) Summary of the invention

[0010] Problems to be solved by the invention

[0011] In the DSS specification, signals are sent to LTE terminals and NR terminals separately. Since a large number of signals that are always sent are specified in LTE, it is difficult to ensure sufficient resources for NR-PDCCH.

[0012] The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to ensure resources for control signals when a plurality of RATs (Radio Access Technologies) coexist on a single carrier in a wireless communication system.

[0013] Means for solving problems

[0014] According to the disclosed technology, a terminal is provided, which comprises: a sending unit, which sends information to a network indicating which of the methods of receiving downlink control channel candidates of the second RAT including code elements configured with a reference signal of the first RAT is supported when a first wireless access technology, i.e., a first RAT and a second RAT, are used on the same frequency band; a receiving unit, which receives from the network wireless resource control signaling, i.e., RRC signaling, indicating which of the methods is activated; and a control unit, which monitors the downlink control channel candidates including the code elements using the method activated by the RRC signaling.

[0015] Effects of the Invention

[0016] According to the disclosed technology, in a wireless communication system, when a plurality of RATs (Radio Access Technology) coexist on a single carrier, it is possible to secure resources for control signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing a configuration example (1) of a wireless communication system.

[0018] Figure 2 This is a diagram showing a configuration example (2) of a wireless communication system.

[0019] Figure 3 This is a diagram showing an example of a downlink channel configuration based on DSS.

[0020] Figure 4 This is a diagram showing an example (1) of PDCCH reception in the embodiment of the present invention.

[0021] Figure 5 This is a diagram showing example (2) of PDCCH reception in the embodiment of the present invention.

[0022] Figure 6 This is a diagram showing example (3) of PDCCH reception in the embodiment of the present invention.

[0023] Figure 7 It is a timing chart for explaining an example of PDCCH reception in the embodiment of the present invention.

[0024] Figure 8 This is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention.

[0025] Fig. 9 This is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention.

[0026] Fig.10 This is a diagram showing an example of the hardware configuration of the base station 10 or the terminal 20 according to the embodiment of the present invention.

[0027] Fig.11 1 is a diagram showing an example of the structure of a vehicle 2001 in the embodiment of the present invention. DETAILED DESCRIPTION

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0029] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are appropriately used. The existing technologies are, for example, existing LTE, but are not limited to existing LTE. In addition, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and subsequent methods (e.g., NR) of LTE-Advanced.

[0030] In addition, in the embodiments of the present invention described below, the terms 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), PUSCH (Physical Uplink Shared Channel), etc. used in the previous LTE are used. These are for the convenience of recording, and the same signals, functions, etc. may also be referred to by other names. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used for NR are not necessarily clearly recorded as "NR-".

[0031] Furthermore, in the embodiments of the present invention, the duplexing method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0032] In the embodiment of the present invention, “configuring” wireless parameters and the like may be pre-configuring predetermined values, or may be configuring wireless parameters notified from the base station 10 or the terminal 20 .

[0033] Figure 1 FIG. 1 is a diagram showing a configuration example (1) of a wireless communication system in an embodiment of the present invention. Figure 1 As shown, the wireless communication system in the embodiment of the present invention includes a base station 10 and a terminal 20. Figure 1 Although one base station 10 and one terminal 20 are shown in each figure, this is only an example and there may be a plurality of base stations 10 and a plurality of terminals 20.

[0034] 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 the wireless signal are defined in the time domain and the frequency domain. The time domain can be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain can be defined by the number of subcarriers or the number of resource blocks. The base station 10 sends a synchronization signal and system information to the terminal 20. Synchronization signals are, for example, NR-PSS and NR-SSS. System information is sent, for example, through NR-PBCH, also called broadcast information. The synchronization signal and system information may also be referred to as SSB (SS / PBCH block). As Figure 1 As shown, the base station 10 sends a control signal or data to the terminal 20 via DL (Downlink), and receives a control signal or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to send and receive signals. In addition, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output)-based communications to DL or UL. In addition, the base station 10 and the terminal 20 can also communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) based on CA (Carrier Aggregation). Furthermore, the terminal 20 can also communicate via the primary cell of the base station 10 based on DC (Dual Connectivity) and the primary and secondary cell group cells (PSCell: Primary SCG Cell) of other base stations 10.

[0035] The terminal 20 is a communication device having a wireless communication function, such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, or an M2M (Machine-to-Machine) communication module. Figure 1 As shown, the terminal 20 receives a control signal or data from the base station 10 via DL and transmits a control signal or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. In addition, the terminal 20 receives various reference signals transmitted from the base station 10 and performs measurement of propagation path quality based on the reception result of the reference signal.

[0036] The terminal 20 can perform carrier aggregation to communicate with the base station 10 by bundling multiple cells (multiple CCs (Component Carriers)). In carrier aggregation, one PCell (Primary cell) and one or more SCells (Secondary cells) are used. In addition, a PUCCH-SCell having a PUCCH may also be used.

[0037] Figure 2 This is a diagram showing example (2) of a wireless communication system in an embodiment of the present invention. Figure 2 FIG. 2 shows a configuration example of a wireless communication system in which DC (Dual Connectivity) is performed. Figure 2 As shown, there are a base station 10A as a MN (Master Node) and a base station 10B as a SN (Secondary Node). The base stations 10A and 10B are connected to the core network respectively. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0038] The cell group provided by the base station 10A as the MN is called MCG (Master Cell Group), and the cell group provided by the base station 10B as the SN is called SCG (Secondary Cell Group). In addition, in DC, MCG is composed of 1 PCell and one or more SCells, and SCG is composed of 1 PSCell (Primary SCG Cell) and one or more SCells.

[0039] The processing actions in this embodiment can be performed by Figure 1 The system structure shown can also be implemented by Figure 2 The present invention may be executed by the system configuration shown in the figure, or may be executed by system configurations other than these.

[0040] The following is an example of DSS (Dynamic Spectrum Sharing) technology that allows LTE and NR to coexist in the same frequency band. DSS technology allows different RATs (Radio Access Technology) to coexist on a single carrier, thereby flexibly responding to business needs during system generation switching.

[0041] Figure 3 This is a diagram showing an example of a downlink channel configuration based on DSS. Figure 3 The time domain shown corresponds to one subframe of LTE. Figure 3As shown in FIG. 1 , in the downlink, "LTE-CRS (Cell specific reference signal: cell specific reference signal)" and "LTE-PDCCH" are transmitted as LTE signals or channels. Figure 3 As shown in FIG. 1 , in the downlink, “NR-PDCCH”, “NR-PDSCH DM-RS (Demodulation reference signal)” and “NR-PDSCH” are also transmitted as NR channels. Figure 3 As shown, "LTE-CRS" may be arranged adjacent to "NR-PDSCH". In addition, for example, although not shown, the "NR-PDCCH region" may also include resources for arranging DM-RS for decoding PDCCH.

[0042] In the current DSS, LTE-CRS is transmitted in each subframe. If the NR side signal is transmitted on the RE (Resource Element) of LTE-CRS, the characteristics of the channel estimation or RRM (Radio Resource Management) of the LTE system will be greatly degraded, so it becomes a norm for the NR side to avoid LTE-CRS and use the remaining resources. Therefore, it is difficult to ensure sufficient resources for NR-PDCCH.

[0043] Therefore, in DSS, the code elements (such as Figure 3 In order to receive NR-PDCCH on a certain symbol of LTE-CRS, the method described below is being studied.

[0044] Figure 4 1 is a diagram showing an example (1) of PDCCH reception in an embodiment of the present invention. Figure 4 As shown, the NR-PDCCH and DMRS that overlap with the LTE-CRS of symbol #1 are punctured. DMRS only uses symbols #2 and #3, or also uses the DMRS of symbol #1 that is not punctured. Figure 4 The PDCCH reception method described is set to method 1-1.

[0045] Figure 5 2 is a diagram showing an example (2) of PDCCH reception in an embodiment of the present invention. Figure 5 As shown, the NR-PDCCH and DMRS that overlap with the LTE-CRS of symbol #1 are truncated, the DMRS is not mapped to symbol #1, and the unmapped resources are used for PDCCH. Figure 5The PDCCH reception method described is set to method 1-2.

[0046] Figure 6 3 is a diagram showing an example (3) of PDCCH reception in an embodiment of the present invention. Figure 6 As shown in FIG. 1 , the NR-PDCCH and DMRS of the resources mapped with LTE-CRS are not truncated, but are directly multiplexed for transmission. Figure 6 The described method for PDCCH reception is set to method 2.

[0047] Here, the existing specification stipulates that the terminal 20 may not monitor PDCCH candidates overlapping with symbols including LTE-CRS (see, for example, Non-Patent Document 4). On the other hand, the network needs to know whether it is a terminal that can monitor PDCCH candidates overlapping with LTE-CRS.

[0048] In addition, there are multiple methods for receiving NR-PDCCH on a certain codeword of LTE-CRS, so it is necessary to make the methods applied in the terminal 20 and the network consistent.

[0049] Therefore, the terminal 20 can report to the network whether it can receive the NR-PDCCH candidate including the OFDM symbol in which the LTE-CRS symbol is transmitted through the UE capability. In addition, when multiple methods are standardized, the terminal 20 can also report to the network which method can be handled through the UE capability.

[0050] The terminal 20 that has reported the above UE capabilities may monitor PDCCH candidates overlapping with symbols including LTE-CRS when the network sets at least any one or a specific combination of information of 1)-4) shown below through RRC signaling.

[0051] 1) A case where a rate matching mode related to a 4-port CRS is set in the serving cell.

[0052] 2) A case where a CRS pattern for a function of monitoring a PDCCH candidate overlapping with a symbol including a CRS is set in the serving cell separately from the rate matching purpose.

[0053] 3) A case where a PDCCH CORESET and / or search space that overlaps with a symbol including a CRS is set.

[0054] 4) When a specific new information element (IE) is set. For example, when an IE is set to activate a function of monitoring a PDCCH candidate overlapping a symbol including a CRS.

[0055] Figure 71 is a timing diagram for illustrating an example of PDCCH reception in an embodiment of the present invention. In step S11, the terminal 20 sends a UE capability indicating whether it can receive an NR-PDCCH candidate including an OFDM symbol in which an LTE-CRS symbol is transmitted to the base station 10. In the next step S12, the terminal 20 receives the above-mentioned specific RRC signaling. In the next step S13, the terminal 20 monitors the PDCCH candidate overlapping with the symbol including the LTE-CRS.

[0056] Even when receiving the above-mentioned specific RRC signaling, when the CORESET and / or search space is a specific CORESET and / or search space, or when it is other than a specific CORESET and / or search space, the terminal 20 may not monitor the PDCCH candidates overlapping with the codeword including the CRS, and may not assume that this situation is set. The specific CORESET and / or search space may be, for example, CORESET0 and / or SS0 (Search Space 0), or a common search space.

[0057] When multiple methods of receiving NR-PDCCH candidates including OFDM symbols in which LTE-CRS symbols are transmitted are standardized, the terminal 20 can report which method is supported through UE capabilities, and the network can also set which method to activate through RRC signaling.

[0058] Terminal 20 can change the mapping of NR-PDCCH and / or DMRS of codewords containing CRS, and the assumption of whether or not to truncate, depending on which method is activated.

[0059] For example, when the above-mentioned method 1-1 is activated, the terminal 20 assumes that the NR-PDCCH and DMRS that overlap with the CRS in the codeword including the CRS are punctured.

[0060] For example, when the above-mentioned method 1-2 is activated, the terminal 20 assumes that the DMRS is not mapped in the codeword including the CRS but the NR-PDCCH is mapped instead, and the NR-PDCCH overlapping with the CRS is truncated.

[0061] For example, when the above-mentioned method 2 is activated, the terminal 20 does not assume that the NR-PDCCH and DMRS that overlap with the CRS in the codeword including the CRS are truncated.

[0062] A condition for activating the function of monitoring a PDCCH candidate overlapping a symbol including a CRS may be defined. In addition, a condition for activating a specific method applied to the function of monitoring a PDCCH candidate overlapping a symbol including a CRS may be defined.

[0063] For example, when the aggregation level of the PDCCH is above a specific value or below a specific value, the function of monitoring the PDCCH candidates overlapping with the codewords containing the CRS can be activated, and the specific method applied to the function can also be activated. In addition, the UE capability can also be used to report whether the function or specific method can be activated above or below a specific aggregation level.

[0064] For example, in the case where a CORESET and / or PDCCH candidate spanning multiple CRS patterns (especially with reference to the rate matching pattern) is not set, the function of monitoring PDCCH candidates overlapping with the codeword containing CRS can be activated, and a specific method applied to the function can be activated. Alternatively, in the case where a CORESET and / or PDCCH candidate spanning multiple CRS patterns (especially with reference to the rate matching pattern) is set, the function of monitoring PDCCH candidates overlapping with the codeword containing CRS can be set to be inactivated, and in such a case, whether it can be activated can also be reported by the UE capability.

[0065] Through the above embodiments, in the DSS scenarios of LTE and NR, NR-PDCCH can be transmitted and received on the code elements configured with LTE-CRS, thereby increasing the capacity of NR-PDCCH.

[0066] That is, in a wireless communication system, when a plurality of RATs (Radio Access Technology) coexist on a single carrier, resources for control signals can be secured.

[0067] (Device Structure)

[0068] Next, the functional configuration examples of the base station 10 and the terminal 20 that perform the above-described processing and operation are described. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions in the embodiments.

[0069] <Base station 10>

[0070] Figure 8 FIG. 1 is a diagram showing an example of a functional configuration of a base station 10 in an embodiment of the present invention. Figure 8 As shown, the base station 10 includes a transmission unit 110 , a reception unit 120 , a setting unit 130 , and a control unit 140 . Figure 8 The functional configuration shown is only an example, and any functional division and function unit name may be used as long as the operation according to the embodiment of the present invention can be performed.

[0071] The transmitting unit 110 includes a function of generating a signal to be sent to the terminal 20 side and wirelessly transmitting the signal. In addition, the transmitting unit 110 sends network node messages to other network nodes. The receiving unit 120 includes a function of receiving various signals sent from the terminal 20 and obtaining, for example, higher layer information from the received signals. In addition, the transmitting unit 110 has a function of sending NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, etc. to the terminal 20. In addition, the receiving unit 120 receives network node messages from other network nodes.

[0072] The setting unit 130 stores preset setting information and various setting information transmitted to the terminal 20. The content of the setting information is, for example, information related to DSS.

[0073] As described in the embodiment, the control unit 140 performs control related to DSS. Functional units related to signal transmission in the control unit 140 may be included in the transmission unit 110 , and functional units related to signal reception in the control unit 140 may be included in the reception unit 120 .

[0074] <Terminal 20>

[0075] Fig. 9 FIG. 2 is a diagram showing an example of the functional structure of the terminal 20 in the embodiment of the present invention. Fig. 9 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Fig. 9 The functional configuration shown is only an example, and any functional division and function unit name may be used as long as the operation according to the embodiment of the present invention can be performed.

[0076] The transmitting unit 210 generates a transmission signal according to the transmission data, and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly, and obtains a higher layer signal from the received physical layer signal. In addition, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, etc. transmitted from the base station 10. And for example, as D2D communication, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0077] The setting unit 230 stores various setting information received by the receiving unit 220 from the base station 10. In addition, the setting unit 230 also stores pre-set setting information. The content of the setting information is, for example, information related to the DSS.

[0078] As described in the embodiment, the control unit 240 performs control related to DSS. Functional units related to signal transmission in the control unit 240 may be included in the transmission unit 210, and functional units related to signal reception in the control unit 240 may be included in the reception unit 220.

[0079] (Hardware Structure)

[0080] The block diagram used in the description of the above embodiment ( Figure 8 and Fig. 9 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented using these multiple devices. The functional blocks can also be implemented by combining software in the above-mentioned one device or the above-mentioned multiple devices.

[0081] Functions include judging, determining, judging, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that performs a sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0082] For example, the base station 10 , the terminal 20 , and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.10 1 is a diagram showing an example of the hardware structure of a base station 10 and a terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 may be configured as a computer device that physically includes 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, and the like.

[0083] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware configuration of the base station 10 and the terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0084] Each function in the base station 10 and the terminal 20 is implemented by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0085] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, the control unit 140, the control unit 240, etc. may also be implemented by the processor 1001.

[0086] In addition, the processor 1001 reads a program (program code), a software module, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes accordingly. As a program, a program that causes the computer to execute at least a part of the actions described in the above embodiments is used. For example, Figure 8 The control unit 140 of the base station 10 shown may also be implemented by a control program stored in the storage device 1002 and executed in the processor 1001. For example, Fig. 9 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operated in the processor 1001. Although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be implemented by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0087] The storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing the communication method involved in one embodiment of the present disclosure.

[0088] The auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (CompactDisc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic stripe, etc. The above-mentioned storage medium may be, for example, a database, a server, and other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0089] The communication device 1004 is hardware (transceiver device) for communicating between computers via at least one of a wired network and a wireless network, and may also be referred to as a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may also be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transceiver antenna, an amplifier, a transceiver, a transmission path interface, etc. may also be implemented by the communication device 1004. The transceiver may also be implemented by physically or logically separating the transmitter and the receiver.

[0090] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0091] In addition, the processor 1001 and the storage device 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses may be used between the devices.

[0092] In addition, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0093] Fig.11 FIG. 2 shows a structural example of a vehicle 2001. Fig.11As shown, the vehicle 2001 includes a driving unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each form / embodiment described in the present disclosure may also be applied to a communication device mounted on the vehicle 2001, for example, may also be applied to the communication module 2013.

[0094] The driving unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by a user.

[0095] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals from various sensors 2021 to 2029 included in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be referred to as an ECU (Electronic Control Unit).

[0096] As signals from various sensors 2021~2029, there are current signals from the current sensor 2021 that senses the current of the motor, speed signals of the front wheels and rear wheels obtained by the speed sensor 2022, air pressure signals of the front wheels and rear wheels obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression amount signals obtained by the accelerator pedal sensor 2029, brake pedal depression amount signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 2028, and the like.

[0097] The information service unit 2012 is composed of various devices such as a car navigation system, an audio system, a speaker, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013 to provide various multimedia information and multimedia services to passengers of the vehicle 2001. The information service unit 2012 may include input devices (such as keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept inputs from the outside, and may also include output devices (such as displays, speakers, LED lights, touch panels, etc.) that implement outputs to the outside.

[0098] The driving assistance system unit 2030 is composed of various devices for preventing accidents or reducing the driver's driving load, such as millimeter wave radar, LiDAR (Light Detection and Ranging), camera, positioning device (such as GNSS, etc.), map information (such as high-definition (HD) map, autonomous driving vehicle (AV) map, etc.), gyroscope system (such as IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 sends and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0099] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data with the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheel 2007, the rear wheel 2008, the axle 2009, the microprocessor 2031 in the electronic control unit 2010, the memory (ROM, RAM) 2032, and the sensors 2021 to 2029 via the communication port 2033.

[0100] The communication module 2013 can be controlled by the microprocessor 2031 of the electronic control unit 2010, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. The external device can also be, for example, a base station, a mobile station, etc.

[0101] The communication module 2013 may also transmit at least one of the signals from the various sensors 2021-2028 input to the electronic control unit 2010, the information obtained based on the signals, and the information based on the input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted by the communication module 2013 may include the above-mentioned information based on the input.

[0102] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from an external device and displays it on the information service unit 2012 of the vehicle 2001. The information service unit 2012 may also be referred to as an output unit that outputs information (for example, outputs information to a display, a speaker, etc. based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH)). In addition, the communication module 2013 stores various information received from the external device in the memory 2032 that can be used by the microprocessor 2031. The microprocessor 2031 may also control the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the gear lever 2006, the front wheel 2007, the rear wheel 2008, the axle 2009, the sensors 2021 to 2029, etc. of the vehicle 2001 based on the information stored in the memory 2032.

[0103] (Summary of Implementation Methods)

[0104] As described above, according to an embodiment of the present invention, there is provided a terminal comprising: a sending unit, which, when a first wireless access technology, i.e., a first RAT and a second RAT, are used on the same frequency band, sends to a network information indicating which of the methods of receiving downlink control channel candidates of the second RAT, including code elements configured with a reference signal of the first RAT, is supported; a receiving unit, which receives from the network wireless resource control signaling, i.e., RRC signaling, indicating which of the methods is activated; and a control unit, which monitors the downlink control channel candidates including the code elements using the method activated by the RRC signaling.

[0105] Through the above structure, in the DSS scenario of LTE and NR, NR-PDCCH can be transmitted and received on the code element configured with LTE-CRS, thereby increasing the capacity of NR-PDCCH. That is, in a wireless communication system, control signal resources can be ensured when multiple RATs (Radio Access Technology) coexist on a single carrier.

[0106] Alternatively, the control unit assumes that the downlink control channel and the decoding reference signal are truncated in the codeword. Through this structure, in the DSS scenario of LTE and NR, NR-PDCCH can be transmitted and received on the codeword where LTE-CRS is configured, thereby increasing the capacity of NR-PDCCH.

[0107] Alternatively, the control unit assumes that the decoding reference signal is not mapped in the codeword and the downlink control channel is mapped instead, and the downlink control channel is truncated in the codeword. Through this structure, in the DSS scenario of LTE and NR, NR-PDCCH can be transmitted and received on the codeword where LTE-CRS is configured, thereby increasing the capacity of NR-PDCCH.

[0108] Alternatively, the control unit assumes that the downlink control channel and the decoding reference signal are not truncated in the codeword. Through this structure, in the DSS scenario of LTE and NR, NR-PDCCH can be transmitted and received on the codeword where LTE-CRS is configured, thereby increasing the capacity of NR-PDCCH.

[0109] Alternatively, the control unit activates a function of monitoring the downlink control channel candidate including the codeword when the aggregation level of the downlink control channel is above or below a threshold. Through this structure, in the DSS scenario of LTE and NR, NR-PDCCH can be transmitted and received on the codeword configured with LTE-CRS, thereby increasing the capacity of NR-PDCCH.

[0110] In addition, according to an embodiment of the present invention, a communication method is provided, wherein the terminal performs the following steps: when a first wireless access technology, i.e., a first RAT and a second RAT, are used on the same frequency band, information is sent to a network indicating which of the methods of receiving downlink control channel candidates of the second RAT including code elements configured with a reference signal of the first RAT is supported; wireless resource control signaling, i.e., RRC signaling, is received from the network indicating which of the methods is activated; and the downlink control channel candidates including the code elements are monitored using the method activated by the RRC signaling.

[0111] Through the above structure, in the DSS scenario of LTE and NR, NR-PDCCH can be transmitted and received on the code element configured with LTE-CRS, thereby increasing the capacity of NR-PDCCH. That is, in a wireless communication system, control signal resources can be ensured when multiple RATs (Radio Access Technology) coexist on a single carrier.

[0112] (Supplementary Implementation Methods)

[0113] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments, and those skilled in the art should understand various variations, modifications, alternatives, replacements, etc. In order to promote the understanding of the invention, specific numerical examples are used for description, but unless otherwise specified, these numerical values ​​are only examples, and any appropriate value may also be used. The item distinction in the above description is not essential to the present invention. The items recorded in two or more items can be combined and used as needed, and the items recorded in a certain item can be applied to the items recorded in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of the physical components. The actions of multiple functional units can be performed by one physical component, or the actions of one functional unit can be performed by multiple physical components. Regarding the processing steps described in the embodiment, the order of processing can be swapped if there is no contradiction. In order to facilitate the description of the processing, the base station 10 and the terminal 20 are described using a functional block diagram, but such a device can also be implemented by hardware, software, or a combination thereof. The software that operates according to the implementation mode of the present invention through the processor of the base station 10 and the software that operates according to the implementation mode of the present invention through the processor of the terminal 20 can also 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 and any other appropriate storage medium.

[0114] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high-level signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may be referred to as an RRC message, for example, it may also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0115] Each form / implementation method described in the present disclosure can also be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6G (6th generation mobile communication system), xG (xth generation mobile communication system) (xG (x is, for example, an integer or a decimal)), FRA (Future Radio Access), NR (new Radio), NX (New radio access), FX (Future generation radio access), 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 At least one of 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems that are extended, modified, created, and specified based on these systems. In addition, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) may also be applied.

[0116] The processing steps, timing, and flow of each form / implementation described in this specification may be reversed in order if there is no contradiction. For example, the method described in this disclosure uses the order of examples to indicate the elements of various steps, but is not limited to the specific order indicated.

[0117] In this specification, specific actions performed by the base station 10 are sometimes also performed by its upper node according to the situation. In a network composed of one or more network nodes having the base station 10, various actions performed for communicating with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station 10 is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0118] The information or signals described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and can also be input or output via a plurality of network nodes.

[0119] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0120] The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0121] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0122] In addition, software, commands, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0123] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0124] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0125] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0126] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, a wireless resource may be indicated by an index.

[0127] The names used for the above parameters are non-restrictive in any respect. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by all appropriate names, and therefore the various names assigned to these various channels and information elements are non-restrictive in any respect.

[0128] In the present disclosure, the terms "base station (BS)," "wireless base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes, the base station is also referred to as macro cell, small cell, femto cell, pico cell and the like.

[0129] A base station can accommodate one or more (for example, 3) 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 also provide communication services through a base station subsystem (for example, a small base station RRH: Remote Radio Head for indoor use). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of the base station and the base station subsystem that provide communication services within the coverage area.

[0130] In the present disclosure, the base station sending information to the terminal may be replaced by the base station instructing the terminal to perform control / action based on the information.

[0131] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0132] For mobile stations, those skilled in the art sometimes also use the following terms: 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 appropriate terms.

[0133] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to an object that can move, and the moving speed is arbitrary. In addition, of course, it also includes the case where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, motorcycles, bicycles, networked cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, two-wheel trailers, rickshaws, ships (ships and other watercraft: ships and other ships), airplanes, rockets, artificial satellites, Drone (registered trademark), multi-rotor helicopters, quadcopters, balloons and objects mounted on them, and is not limited to this. In addition, the mobile body may also be a mobile body that drives autonomously based on an operating instruction. It may be a means of transportation (for example, a car, an airplane, etc.), a mobile body that moves in an unmanned manner (for example, a drone, an autonomous driving car, etc.), or a robot (man-driven or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does 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.

[0134] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple terminals 20 (for example, it may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) may also apply various forms / implementations of the present disclosure. In this case, it may also be configured that the terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0135] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station may have the functions of the user terminal.

[0136] The terms "determining" and "determining" used in the present disclosure sometimes also include a variety of actions. "Determining" and "determining" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include matters that have been received (for example, receiving information), transmitted (for example, sending information), input, output, accessed (for example, accessed data in memory) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "judged" or "determined". That is, "judgment" and "decision" may include certain actions that are considered to be "judged" or "decided". In addition, "judgment (decision)" may also be replaced by "assuming", "expecting", "considering", etc.

[0137] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region may be used to "connect" or "couple" to each other.

[0138] The reference signal may be referred to as RS (Reference Signal) for short, or may be referred to as a pilot signal (Pilot) according to the applied standard.

[0139] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise explicitly stated. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0140] Any reference to an element using the designations "first", "second", etc. used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, a reference to a first element and a second element does not mean that only two elements can be taken or that the first element must precede the second element in any form.

[0141] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section”, “circuit”, “device” or the like.

[0142] When the terms "include", "including" and their variations are used in the present disclosure, these terms are intended to be inclusive like the term "comprising". Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0143] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as a subframe. A subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is independent of a numerology.

[0144] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, and the like.

[0145] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0146] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0147] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0148] For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, and one time slot or one mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing a TTI may not be referred to as a subframe, but as a time slot, a mini time slot, or the like.

[0149] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each terminal 20) to each terminal 20 in units of TTI. In addition, the definition of TTI is not limited to this.

[0150] TTI can be a transmission time unit of data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit such as scheduling and link adaptation. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0151] In addition, when one time slot or one mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can be the minimum time unit for scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit for scheduling can be controlled.

[0152] A TTI with a time length of 1 ms is also called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-time slot, a sub-time slot, a time slot, etc.

[0153] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be understood as a TTI with a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be understood as a TTI with a TTI length less than that of a long TTI (long TTI) and greater than 1ms.

[0154] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined according to the parameter set.

[0155] In addition, the time domain of an RB may include one or more symbols, and may be the length of one slot, one mini slot, one subframe, or one TTI. One TTI, one subframe, etc. may be composed of one or more resource blocks, respectively.

[0156] In addition, one or more RBs may also be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc.

[0157] In addition, 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.

[0158] A bandwidth part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, the common RBs may be identified by the index of the RBs relative to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0159] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0160] At least one of the set BWPs may be active, and it is not assumed that the UE transmits or receives a predetermined signal / channel outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may be replaced with "BWP".

[0161] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length may be changed in various ways.

[0162] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes the case where the noun following the article is in plural form.

[0163] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". In addition, the term may mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0164] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched depending on the execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., notification of the scheduled information is not performed).

[0165] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0166] Description of symbols

[0167] 10: Base Station

[0168] 110: Sending Department

[0169] 120: Receiving Department

[0170] 130: Setting department

[0171] 140: Control Department

[0172] 20: Terminal

[0173] 210: Sending Department

[0174] 220: Receiving Department

[0175] 230: Setting department

[0176] 240: Control Department

[0177] 1001: Processor

[0178] 1002: Storage device

[0179] 1003: Auxiliary storage device

[0180] 1004: Communication device

[0181] 1005: Input device

[0182] 1006: Output device

[0183] 2001: Vehicles

[0184] 2002: Drive Department

[0185] 2003: Steering

[0186] 2004: Accelerator pedal

[0187] 2005: Brake pedal

[0188] 2006: Gear Lever

[0189] 2007: Front wheel

[0190] 2008: Rear wheel

[0191] 2009: Axles

[0192] 2010: Electronic Control Department

[0193] 2012: Information Services Department

[0194] 2013: Communication Module

[0195] 2021: Current Sensors

[0196] 2022: Speed ​​Sensor

[0197] 2023: Air pressure sensor

[0198] 2024: Vehicle speed sensor

[0199] 2025: Accelerometers

[0200] 2026: Brake pedal sensor

[0201] 2027: Gearshift sensor

[0202] 2028: Object detection sensors

[0203] 2029: Accelerator pedal sensor

[0204] 2030: Driving Assistance Systems Division

[0205] 2031: Microprocessors

[0206] 2032: Memory (ROM, RAM)

[0207] 2033: Communication port (IO port)

Claims

1. A terminal comprising: a transmitting unit configured to transmit information indicating which of the methods of receiving downlink control channel candidates of the second RAT including symbols configured with a reference signal of the first RAT is supported to a network when a first radio access technology, namely a first RAT and a second RAT, is operated in the same frequency band; a receiving unit configured to receive radio resource control signaling (RRC signaling) from a network indicating which of the methods is activated; and A control unit monitors the downlink control channel candidate including the symbol using a method activated by the RRC signaling.

2. The terminal according to claim 1, wherein: The control unit assumes that the downlink control channel and the decoding reference signal are punctured in the symbol.

3. The terminal according to claim 1, wherein: The control unit assumes that a decoding reference signal is not mapped to the symbol but is mapped to the downlink control channel instead, and that the downlink control channel is punctured in the symbol.

4. The terminal according to claim 1, wherein: The control unit assumes that the downlink control channel and the decoding reference signal are not punctured in the symbol.

5. The terminal according to claim 1, wherein: The control unit activates a function of monitoring the downlink control channel candidate including the symbol when the aggregation level of the downlink control channel is equal to or higher than a threshold.

6. A communication method, wherein: Perform the following steps from the terminal: When a first radio access technology, namely a first RAT and a second RAT, are operated on the same frequency band, sending information to a network indicating which of the methods of receiving a downlink control channel candidate of the second RAT including a symbol configured with a reference signal of the first RAT is supported; receiving a radio resource control signaling (RRC signaling) from the network indicating which of the methods is activated; as well as The downlink control channel candidate including the symbol is monitored using a method activated by the RRC signaling.

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