Method, terminal, device and storage medium for monitoring a control channel in a wireless communication system, and method and base station for transmitting a control channel

Abstract

According to the present invention, a terminal switches a search space set of a first SSSG to a search space of a second SSSG at a search space set group (SSSG) switching time, and performs PDCCH monitoring for at least one serving cell. When PDCCH monitoring is performed on a slot-group basis for the at least one serving cell, the terminal determines the SSSG switching time based on a maximum Xs value among Xs values ​​for the at least one serving cell.

Description

[Technical field]

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

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. In general, wireless communication systems are multiple access systems capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, etc. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem to be solved by the present invention is to provide a control channel monitoring method and an apparatus therefor for efficiently monitoring a control channel in a wireless communication system, and a method and an apparatus therefor for transmitting a control channel.

[0004] The technical object of the present invention is not limited to the above-mentioned technical object, and other technical objects can be inferred from the embodiments of the present invention. [Means for solving the problem]

[0005] The present invention provides a method for a terminal to monitor a control channel in a wireless communication system.

[0006] In another aspect of the present invention, there is provided a terminal for monitoring a control channel in a wireless communication system, the terminal including at least one transceiver, at least one processor, and at least one computer memory operatively coupled to the at least one processor and which, when executed, causes the at least one processor to perform operations.

[0007] In yet another aspect of the present invention, there is provided an apparatus for a terminal, the apparatus including at least one processor and at least one computer memory operatively connected to the at least one processor and configured to, when executed, cause the at least one processor to perform operations.

[0008] In yet another aspect of the present invention, a computer-readable non-transitory storage medium is provided that contains at least one computer program for causing at least one processor to perform operations.

[0009] In yet another aspect of the present invention, a method for a base station transmitting a control channel in a wireless communication system is provided.

[0010] In yet another aspect of the present invention, a base station for transmitting a control channel in a wireless communication system is provided.

[0011] The method in the terminal, or operations performed by execution of instructions stored in at least one memory or storage medium of the terminal or the apparatus for the terminal, include receiving a search space configuration for at least one serving cell (e.g., a serving cell or serving cell set), the search space configuration including a configuration for at least one search space set belonging to a first search space set group (SSSG) having at least a first group index and a configuration for at least one search space set belonging to a second SSSG having a second group index, performing physical downlink control channel (PDCCH) monitoring according to the search space set of the first SSSG for the at least one serving cell based on the search space configuration, and performing SSSG switching based on detecting a DCI format notifying the at least one serving cell of SSSG switching or based on expiration of a timer for SSSG switching. Based on the at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is performed by delaying the SSSG switching period from the last symbol of a PDCCH having the DCI format by at least a predetermined number P switchAt the beginning of a first slot of a slot-group of Xs slots after symbols, i) stopping the PDCCH monitoring according to the search space set of the first SSSG, and ii) starting the PDCCH monitoring according to the search space set of the second SSSG, where the slot-group of Xs slots are consecutive. Based on the at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the terminal or the operation determines, for the SSSG switching, a slot at which to stop or start the PDCCH monitoring and a symbol within the slot based on a maximum Xs value among Xs values ​​for the at least one serving cell (e.g., Xs value associated / configured for the at least one serving cell).

[0012] The method in the base station, or actions performed by execution of instructions stored in at least one memory of the base station, include transmitting a search space configuration for at least one serving cell (e.g., a serving cell or a serving cell set), the search space configuration including a configuration for at least one search space set belonging to a first search space set group (SSSG) having at least a first group index and a configuration for at least one search space set belonging to a second SSSG having a second group index, transmitting at least one physical downlink control channel (PDCCH) according to the search space set of the first SSSG for the at least one serving cell based on the search space configuration, and performing the SSSG switching based on transmitting a DCI format notifying the at least one serving cell of SSSG switching or based on expiration of a timer for SSSG switching. Based on the at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is performed by delaying the SSSG switching period from the last symbol of a PDCCH having the DCI format by at least a predetermined number P switchAt the beginning of a first slot of a slot-group of Xs slots after symbols, i) stopping transmitting at least one PDCCH according to the search space set of the first SSSG, and ii) starting transmitting at least one PDCCH according to the search space set of the second SSSG, where the slot-groups of Xs slots are contiguous. Based on the at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the base station or the operation determines a slot in which the SSSG switching will occur and a symbol within the slot based on a maximum Xs value among Xs values ​​for the at least one serving cell (e.g., Xs value associated / configured for the at least one serving cell).

[0013] In each aspect of the present invention, a cell group configuration for a switch is provided to the terminal by the base station. When the cell group configuration for a switch is provided, the at least one serving cell is a serving cell set. Based on the cell group configuration for a switch, the SSSG switching is performed for all serving cells in the serving cell set.

[0014] In each aspect of the present invention, the cell group setting for the switch is a radio resource control (RRC) parameter cellGroupForSwitch.

[0015] In each embodiment of the present invention, the predetermined number P switch is provided to the terminal by the base station.

[0016] In each embodiment of the present invention, the predetermined number P switch is predefined for the subcarrier spacing of 960 kHz and the processing capability of the terminal.

[0017] In each aspect of the present invention, each search space set in the first SSSG and the second SSSG is set based on one of the Xs values ​​for the at least one serving cell.

[0018] In various aspects of the invention, each of the Xs values ​​for the at least one serving cell is associated with a search space set configured for the at least one serving cell.

[0019] In each aspect of the present invention, information regarding the location of an SSSG flag field in the DCI format for the at least one serving cell is provided by the base station to the terminal.

[0020] In each aspect of the present invention, the DCI format is DCI format 2_0.

[0021] The above-described aspects of the present invention are merely some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be understood and derived by those having ordinary skill in the art based on the detailed description of the present invention described below. Effect of the Invention

[0022] According to an embodiment of the present invention, a terminal can perform more efficient control signal monitoring.

[0023] The technical effects of the present invention are not limited to the above-mentioned technical effects, and other technical effects may be inferred from the embodiments of the present invention. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 illustrates a structure of a radio frame. [Diagram 2] FIG. 2 illustrates a resource grid of slots. [Diagram 3]A diagram showing an example of mapping physical channels within a slot. [Figure 4] FIG. 13 illustrates search space set group switching according to some implementations of the present invention. [Diagram 5] FIG. 13 illustrates search space set group switching according to some implementations of the present invention. [Figure 6] FIG. 2 is a diagram illustrating a flow of signal transmission and reception according to an embodiment of the present invention. [Figure 7] FIG. 2 is a diagram illustrating a flow of signal transmission and reception according to an embodiment of the present invention. [Figure 8] 1 is a diagram illustrating a communication system 1 to which the present invention is applied. [Figure 9] 1 is a diagram illustrating a wireless device to which the present invention can be applied; [Figure 10] 11 is a diagram illustrating another example of a wireless device to which the present invention is applied; FIG. [Figure 11] FIG. 1 is a diagram illustrating a vehicle or an autonomous vehicle to which the present invention is applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The following technologies can be used for various wireless access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (registered trademark) 3rd Generation Partnership Project LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0026] For a clearer description, the present invention will be described based on a 3GPP communication system (e.g., LTE-A, NR), but the technical idea of ​​the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. In particular, LTE technology after 3GPP TS 36.xxx Release 10 is called LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is called LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR can also be called a 3GPP system. "xxx" refers to the detailed number of the standard document. LTE / NR is collectively called a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, please refer to the matters described in the standard documents previously published by the present invention. For example, the following documents can be referenced.

[0027] 3GPP NR

[0028] -38.211: Physical channels and modulation

[0029] -38.212: Multiplexing and channel coding

[0030] -38.213: Physical layer procedures for control

[0031] -38.214: Physical layer procedures for data

[0032] -38.300: NR and NG-RAN Overall Description

[0033] -38.331: Radio Resource Control (RRC) protocol specification

[0034] FIG. 1 illustrates the structure of a radio frame used in NR.

[0035] In NR, uplink (UL) and downlink (DL) transmissions are composed of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HF). A half-frame is defined as five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). If a normal CP is used, each slot contains 14 symbols. If an extended CP is used, each slot contains 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

[0036] Table 1 illustrates that when a general CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0037] [Table 1]

[0038] Table 2 illustrates that when an extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0039] [Table 2]

[0040] In an NR system, the settings of OFDM(A) pneumatics (e.g., SCS, CP length, etc.) are different among multiple cells merged to one terminal (User Equipment; UE). As a result, the settings of (absolute time) intervals of time resources (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) consisting of the same number of symbols are different among the merged cells.

[0041] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) neurologies (e.g., subcarrier spacing, SCS) to support various 5G services. For example, a 15kHz SCS supports wide areas in traditional cellular bands, while a 30kHz / 60kHz SCS supports dense urban areas, lower latency, and wider carrier bandwidth.

[0042] The NR frequency band is defined by two types of frequency ranges (FR1 / FR2). FR1 / FR2 are configured as shown in Table 3 below. FR2 also stands for millimeter wave (mmW).

[0043] [Table 3]

[0044] FIG. 2 illustrates the slot structure of an NR frame.

[0045] A slot includes multiple symbols in the time domain. For example, in the case of a general CP, one slot includes 14 symbols, while in the case of an extended CP, one slot includes 12 symbols. A carrier includes multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. In the frequency domain, multiple RB interlaces (simply, interlaces) are defined. An interlace m ∈ {0, 1, ..., M-1} is composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}. M indicates the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive RBs (e.g., physical RBs, PRBs) in the frequency domain, and can correspond to one OFDM numerology (e.g., SCS(u), CP length, etc.). A carrier includes up to N (e.g., 5) BWPs. Data communication is performed in an activated BWP, and only one BWP is activated for one terminal in one cell / carrier. Each element in the resource grid is called a resource element (RE), and one modulation symbol can be mapped to it.

[0046] In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and the terminal transmits information to the base station via an uplink (UL). Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels / signals exist depending on the type / use of the information transmitted and received. A physical channel corresponds to a set of resource elements (RE) that carry information originating from a higher layer. A physical signal corresponds to a set of resource elements (RE) used by a physical layer (PHY), but does not carry information originating from a higher layer. The higher layers include a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, etc.

[0047] DL physical channels include PBCH (Physical Broadcast channel), PDSCH (Physical Downlink Shared channel) and PDCCH (Physical Downlink Control channel). DL physical signals include DL RS (Reference Signal), PSS (Primary synchronization signal) and SSS (Secondary synchronization signal). DL RS include DM-RS (Demodulation RS), PT-RS (Phase-tracking RS) and CSI-RS (channel-state information RS). UL physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel). UL physical signals include UL RS. UL RS include DM-RS, PT-RS and SRS (Sounding RS).

[0048] FIG. 3 shows an example of mapping physical channels within a slot.

[0049] A DL control channel, DL or UL data, and UL control channel are all included in one slot. For example, the first N symbols in a slot are used to transmit the DL control channel (hereinafter, DL control region), and the last M symbols in a slot are used to transmit the UL control channel (hereinafter, UL control region). N and M are integers equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter, data region) is used to transmit DL data or UL data. There is a time gap between the control region and the data region for DL-to-UL or UL-to-DL switching. The PDCCH is transmitted in the DL control region, and the PDSCH is transmitted in the DL data region. Some symbols at the time of switching from DL to UL in a slot are used as the time gap.

[0050] In the present invention, the base station is, for example, a gNodeB.

[0051] Downlink (DL) physical channels / signals

[0052] (1) PDSCH

[0053] The PDSCH carries downlink data (e.g., DL-shared channel transport block, DL-SCH TB). The TB is encoded into a codeword (CW) and then transmitted through a process of scrambling and modulation. The CW includes one or more code blocks (CB). One or more CBs are collected into one CBG (CB group). Depending on the cell configuration, the PDSCH can carry up to two CWs. Scrambling and modulation are performed for each CW, and the modulation symbols generated from each CW are mapped to one or more layers. Each layer is precoded, mapped to resources together with the DMRS, and transmitted from the corresponding antenna port. The PDSCH is dynamically scheduled by the PDCCH (dynamic scheduling) or semi-statically scheduled (Configured Scheduling, CS) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). Thus, in dynamic scheduling, PDSCH transmission is accompanied by a PDCCH, whereas in CS, PDSCH transmission is not accompanied by a PDCCH. CS includes semi-persistent scheduling (SPS).

[0054] (2) PDCCH

[0055] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of DL-SCH, frequency / time resource allocation information for UL-SCH (shared channel), paging information for PCH (paging channel), system information on DL-SCH, frequency / time resource allocation information for higher layer control messages such as voluntary access response (RAR) transmitted on PDSCH, transmission power control command, and information on activation / deactivation of SPS / CS (Configured Scheduling), etc. Various DCI formats are provided depending on the information in the DCI.

[0056] Table 4 illustrates an example of a DCI format transmitted via the PDCCH.

[0057] [Table 4]

[0058] DCI format 0_0 is used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​is used to schedule TB-based (or TB-level) PUSCH or CBG (Code Block Group)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 is used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 is referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 is referred to as DL grant DCI or UL scheduling information. DCI format 2_0 is used to deliver dynamic slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to deliver downlink pre-Emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 are transmitted to terminals in a corresponding group via a group common PDCCH, which is a PDCCH transmitted to terminals defined as one group.

[0059] The PDCCH / DCI includes a cyclic redundancy check (CRC), and the CRC is masked / scrambled to various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or use of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked to Cell-RNTI (C-RNTI). If the PDCCH is related to paging, the CRC is masked to P-RNTI (Paging-RNTI). If the PDCCH is related to system information (e.g., System Information Block, SIB), the CRC is masked to System Information RNTI (SI-RNTI). If the PDCCH is related to an unsolicited access response, the CRC is masked to Random Access-RNTI (RA-RNTI).

[0060] Table 5 shows an example of the use of PDCCH according to RNTI and the transmission channel. The transmission channel indicates the transmission channel related to the data carried by the PDSCH / PUSCH scheduled by the PDCCH.

[0061] [Table 5]

[0062] The modulation method of the PDCCH is fixed (e.g., Quadrature Phase Shift Keying, QPSK), and one PDCCH is composed of 1, 2, 4, 8, or 16 CCEs (Control Channel Elements) depending on the AL (Aggregation Level). One CCE is composed of six REGs (Resource Element Groups). One REG is defined by one OFDM symbol and one (P)RB.

[0063] PDCCH is transmitted in a CORESET (Control Resource Set). CORESET corresponds to a physical resource / parameter set used to carry PDCCH / DCI in BWP. For example, CORESET includes a REG set having a predetermined neurology (e.g., SCS, CP length, etc.). CORESET is configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. Examples of parameters / information used to configure CORESET are as follows: One or more CORESETs are configured in one UE, and multiple CORESETs are superimposed in the time / frequency domain.

[0064] - controlResourceSetId: Indicates the identification information (ID) of the CORESET.

[0065] - frequencyDomainResources: Indicates the frequency domain resources of the CORESET. It is indicated by a bitmap, where each bit corresponds to an RB group (= 6 consecutive RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit whose bit value is 1 is assigned to the frequency domain resources of the CORESET.

[0066] - duration: indicates the time domain resource of CORESET. It indicates the number of consecutive OFDMA symbols that compose CORESET. For example, duration has a value of 1 to 3.

[0067] - cce-REG-MappingType: indicates the CCE-to-REG mapping type. Interleaved and non-interleaved types are supported.

[0068] - precoderGranularity: indicates the precoder granularity in the frequency domain.

[0069] - tci-StateSPDCCH: Indicates information (e.g., TCI-StateID) indicating the TCI (Transmission Configuration Indication) state for the PDCCH. The TCI state is used to provide a Quasi-Co-Location (QCL) relationship between DL RSs and PDCCH DMRS ports in an RS set (TCI-State).

[0070] - tci-PresentInDCI: indicates whether the TCI field in the DCI is included or not.

[0071] - pdcch-DMRS-ScramblingID: indicates the information used to initialize the PDCCH DMRS scrambling sequence.

[0072] For PDCCH reception, the UE monitors a set of PDCCH candidates in the CORESET (e.g., blind decoding). The PDCCH candidates indicate the CCEs that the UE monitors for PDCCH reception / detection. PDCCH monitoring is performed in one or more CORESETs on an active DL BWP on each activated cell where PDCCH monitoring is configured. The set of PDCCH candidates that the UE monitors is defined as a PDCCH Search Space (SS) set. The SS set is a Common Search Space (CSS) set or a UE-specific Search Space (USS) set.

[0073] Table 6 illustrates the PDCCH search space.

[0074] [Table 6]

[0075] The SS set is configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. S (e.g., 10) or less SS sets are configured in each DL BWP of the serving cell. For example, the following parameters / information are provided for each SS set (by the RRC information element (IE) SearchSpace): Each SS set is associated with one CORESET, and each CORESET configuration is associated with one or more SS sets.

[0076] - searchSpaceId: Indicates the ID of the SS set.

[0077] - controlResourceSetId: Indicates the CORESET associated with the SS set.

[0078] - monitoringSlotPeriodicityAndOffset: indicates the PDCCH monitoring periodicity period (in slot units) and the PDCCH monitoring period offset (in slot units).

[0079] - monitoringSymbolsWithinSlot: indicates the first OFDMA symbol for PDCCH monitoring in a slot where PDCCH monitoring is configured. It is indicated via a bitmap, where each bit corresponds to each OFDMA symbol in the slot. The MSB of the bitmap corresponds to the first OFDM symbol in the slot. The OFDM symbol corresponding to the bit whose bit value is 1 corresponds to the first symbol of the CORESET in the slot.

[0080] - nrofCandidates: indicates the number of PDCCH candidates for AL={1, 2, 4, 8, 16} (e.g., any one of the values ​​0, 1, 2, 3, 4, 5, 6, 8).

[0081] - searchSpaceType: Indicates whether the SS type is CSS or USS.

[0082] - DCI Format: Indicates the DCI format of the PDCCH candidate.

[0083] Based on the CORESET / SS set configuration, the terminal can monitor PDCCH candidates in one or more SS sets in a slot. An occasion (e.g., a time / frequency resource) for monitoring PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities are configured in a slot.

[0084] In the present invention, a scheduling cell refers to a cell where a PDCCH is transmitted or a cell where a terminal performs PDCCH monitoring, and a scheduled cell refers to a cell where PUSCH / PDSCH resources are allocated / are allocated by DCI carried by a PDCCH. When cross-carrier scheduling is configured for a serving cell, it is possible to configure in the terminal which cell signals downlink assignments and uplink grants for the serving cell, i.e., which cell is a scheduling cell for the serving cell. DCI including resource allocation information for PUSCH / PDSCH includes information regarding which cell the resource allocation information is for, i.e., which cell is scheduled by the DCI. A serving cell where a PDCCH is transmitted can also be a scheduled cell.

[0085] 1. Control channel monitoring in high frequency bands

[0086] The above contents may be applied in combination with the method proposed in the present invention described below, or may be supplemented to clarify the technical features of the method proposed in the present invention.

[0087] In addition, the method described below can be similarly applied to the aforementioned NR system (licensed band) or shared spectrum, and it goes without saying that the technical ideas proposed in the present invention can be embodied in the relevant systems and can be modified or replaced according to the terms, expressions, structures, etc. defined in each system.

[0088] The NR system supports multiple neurologies (or subcarrier spacing, SCS) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in the traditional cellular band, when the SCS is 30 kHz / 60 kHz, it supports dense urban areas, lower latency, and wider carrier bandwidth, and when the SCS is 60 kHz or higher, it supports bands above 24.25 GHz. Until Release 16, the NR frequency bands are defined into two types of frequency ranges (FR1 and FR2) and are configured as shown in Table 3. In addition, discussions are underway to support the NR system in the frequency bands defined by FR1 / FR2 or higher (e.g., 52.6 GHz to 71 GHz).

[0089] A frequency band higher than the FR1 and FR2 bands (for example, 52.6 GHz to 114.25 GHz band, particularly 52.6 GHz to 71 GHz) is referred to as FR2-2. The waveform, SCS, CP length, timing, and the like defined for FR1 and FR2 in conventional NR systems do not need to be applied to FR2-2.

[0090] In the FR2-2 band, SCSs of 120 kHz, 480 kHz, and 960 kHz are used for NR operation. In the case of SCSs of 480 kHz and 960 kHz, the length of the OFDM symbol is shorter than that of 120 kHz. For example, an OFDM symbol of 480 kHz is 1 / 4 times as long as an OFDM symbol of 120 kHz, and an OFDM symbol of 960 kHz is 1 / 8 times as long as an OFDM symbol of 120 kHz. For short-length slots to which 480 kHz and 960 kHz are applied, if PDCCH monitoring is performed in all slots, power consumption, etc., is a burden on the terminal. Therefore, when SCSs of 480 kHz and / or 960 kHz are configured, multi-slot PDCCH monitoring is introduced.

[0091] Multi-slot PDCCH monitoring refers to an operation of performing PDCCH monitoring by defining BD (Blind decoding) / CCE (control channel element) limits using multiple consecutive slots as a reference and / or unit. In conventional NR rel-15, BD / CCE limits are defined in units of one slot, and in NR rel-16, BD / CCE limits are defined in units of spans confined within one slot. A span refers to a PDCCH monitoring unit consisting of consecutive symbols.

[0092] Hereinafter, PDCCH monitoring performed in slot units is referred to as per-slot monitoring, PDCCH monitoring performed in span units is referred to as per-span monitoring, and PDCCH monitoring performed in slot-group units is referred to as per-X monitoring. Hereinafter, in terms related to multi-slot (PDCCH) monitoring (i.e., per-X monitoring), "slot-group size," "X," and "Xs" may all refer to the time unit of per-X monitoring.

[0093] The BD limit refers to the "Maximum number of monitored PDCCH candidates for a DL BWP with SCS configuration for a single serving cell" in the 3GPP standard, and the CCE limit refers to the "Maximum number of non-overlapped CCEs for a DL BWP with SCS configuration for a single serving cell" in the 3GPP standard.

[0094] A number of consecutive slots that are the basis of multi-slot PDCCH monitoring are called a slot group. A slot group is composed of X consecutive slots, and BD / CCE restrictions are defined for each slot group. For example, for 480 kHz SCS, BD / CCE restrictions are defined for each slot group consisting of X=4 slots. Also, Y consecutive slots are defined within the slot group. There may be a type of SS set (search space sets) that is restricted so that PDCCH monitoring is performed only in Y slots. Meanwhile, in per-X monitoring operation, some parameters (e.g., periodicity, offset, duration) of SS set configuration need to be configured (by the base station to the terminal) in X units. For example, periodicity is configured in slot units in per-slot monitoring, but is configured in X slot units in per-X monitoring. As an example, if X=8 is configured in a cell using 960 kHz SCS, the periodicity value for per-X monitoring consists of only multiples of 8.

[0095] In per-X monitoring that operates based on different Xs (or when the terminal reports that it supports multiple Xs), the base station can explicitly indicate the X value for the cell and / or SCS to the terminal via another RRC signaling, etc. If there is no other instruction or before the RRC signaling, the terminal determines and / or derives the X actually used for the SS set configuration among the Xs reported to the base station according to the value of the SS set configuration, and performs the per-X monitoring operation.

[0096] Meanwhile, a terminal (e.g., UE) configured with a multi-cell operation (e.g., carrier aggregation (CA)) performs PDCCH monitoring for a plurality of cells. In this case, a different SCS may be configured for each cell. When per-X monitoring is configured, per-X monitoring may operate based on a different X value for each cell (even if the same SCS is used). Therefore, the X value needs to be indicated to the terminal for each cell. Alternatively, a criterion X that enables per-X monitoring to operate is required for all cells configured with different X values.

[0097] Hereinafter, we propose a method for determining a reference X to be used for SS set configuration in a situation where different X values ​​are reported. We also propose a configuration method for SS set group switching, introduced in Rel-16, to operate for multiple Xs (multiple cell situation) as described above.

[0098] In Rel-15 / 16 NR operation, SS set configuration for per-slot monitoring and per-span monitoring is performed by signaling information regarding the PDCCH monitoring period, the offset expressed in slot units from a frame boundary, and the duration indicating the number of slots in which the SS set exists within the period (number of consecutive slots that a SearchSpace lasts in every occasion, i.e., upon every period as given in the periodicityAndOffset) to the terminal via related RRC parameters. The terminal determines a PDCCH monitoring occasion from such period, offset, duration, and monitoring pattern within the slot.

[0099] Meanwhile, in per-X monitoring, PDCCH monitoring is performed in slot-group units consisting of X slots. Depending on the SS set type, some SS sets are monitored in only Y slots in a slot-group. In slots other than Y slots among the X slots, some SS sets may not be monitored depending on the SS set type. Therefore, SS set configuration parameters such as a period for determining a PDCCH MO (monitoring occasion) position must be performed in units of X slots. Supportable X may be different for each terminal, and the terminal can report one or more supportable X values ​​to the base station. The base station configures an SS set based on one of the reported X values ​​and transmits the configuration information to the terminal via related RRC signaling.

[0100] There are various methods for setting SS set configuration parameters (e.g., period, offset, and / or period) in units of X. For example, new RRC parameters having values ​​in units of X are defined instead of conventional RRC parameters having values ​​in units of one slot. Also, even if the base station transmits conventional RRC parameter values ​​in units of one slot, the terminal applies a value obtained by multiplying the received RRC parameter value by X for each SCS (and using X reported or determined by the terminal). Also, a method is possible in which only values ​​that are multiples of X for each SCS (and reported or determined by the terminal) are set among the conventional RRC parameters having values ​​in units of one slot. The X-unit setting of the SS set configuration shown in the proposed method described later can be understood to include such a setting method.

[0101] The SS set configuration for per-X monitoring operation needs to be performed in units of X slots. Depending on the SS set type, the MO of some SS sets (for convenience, referred to as Group 2 SS) can be located in any slot of a slot-group consisting of X slots (i.e., a slot-group of size X). The MO of some other SS sets (for convenience, referred to as Group 1 SS) can be located only in a specific Y slot in a slot-group. For example, Group 1 SS includes Type 1 CSS with dedicated RRC configuration and type 3 CSS, UE specific SS. Group 2 SS may be referred to as Type 1 CSS without dedicated RRC configuration and type 0, 0A, and 2 CSS.

[0102] Hereinafter, the method of establishing a SS set for per-X monitoring (operating in a multi-cell situation) will be described separately for Group 1 SS and Group 2 SS.

[0103] (Proposal 1) For per-X monitoring operation, if the terminal reports multiple X values ​​(as supportable), the configuration (e.g., period, offset, duration) for group 1 SS is set based on the minimum value of the reported X values, and the terminal determines the PDCCH MO based on this minimum X value.

[0104] In order for the MO of group 1 SS to exist only in Y slots among X slots, the SS set configuration (e.g., period, offset and / or interval) value for the SS must consist of only multiples of X. On the other hand, if the terminal reports multiple Xs that can be supported for per-X monitoring for a specific SCS (or reports optional Xs in addition to the Xs that are mandatorily supported), the base station must determine a reference X for SS set configuration in X units, and the terminal must also determine the MO based on the same X.

[0105] For example, if a terminal reports that it can support X=8 and X=4 for per-X monitoring operating at 960 kHz SCS, an MO set based on X=4 exists every 4 slots (e.g., the period is a multiple of 4), and an MO set based on X=8 exists every 8 slots (e.g., the period is a multiple of 8). Therefore, the SS set configuration needs to be set based on X=4, which corresponds to a common divisor of the two X values, and the terminal determines the MO assuming X=4. If the X values ​​reported by the terminal are all in the form of a power of 2, the smaller value is always a divisor of the larger value, so the SS set configuration is performed based on the minimum value of the reported X values. For per-X monitoring operations in which different Xs are reported, the SS set configuration for group 1 SS is set based on the minimum value of the X values ​​reported by the terminal. In addition, the terminal determines the MO assuming that the SS configuration (e.g., period, offset, section) is performed based on this minimum X value.

[0106] Furthermore, the terminal is instructed by the base station (via RRC or DCI) of an X value that is a reference for SS set configuration (period, offset, and / or interval) for per-X monitoring operation for multiple cells, either implicitly or explicitly. The terminal recognizes that the SS set configuration is performed by the instructed X value, and determines the MO accordingly. For example, the terminal determines the X value available in the BWP based on all configured SS sets in the BWP. In some implementations, a default value (available when not instructed by the base station) may be used as the minimum X value.

[0107] (Proposal 1a) For per-X monitoring operation, the configuration (e.g., period, offset, and / or interval) for Group 1 SS is set based on the minimum value of the X values ​​that can be supported in the per-X monitoring operation for each SCS, and the terminal determines the PDCCH MO based on this minimum X value.

[0108] In order for the MO of group 1 SS to exist only in Y slots within X slots, the SS set configuration (e.g., period, offset, and / or interval) values ​​for the SS need to consist of only multiples of X. Meanwhile, X that can be supported for per-X monitoring operation may be predefined for each SCS. For example, per-X monitoring operation for 960 kHz is defined and / or configured based on X=8 and / or X=4, and per-X monitoring operation for 480 kHz is defined and / or configured based on X=4 and / or X=2. The terminal reports to the base station the X preferred for per-X monitoring operation for each SCS. In some implementations of the present invention, the X value may be multiple for each SCS.

[0109] The SS set configuration is set and / or defined based on the minimum value of multiple values ​​of X. In other words, regardless of the X reported by the terminal to the base station, the SS set configuration is set and / or defined based on the minimum value of X (or (X, Y)) defined for the SCS in the relevant NR specification.

[0110] For example, when X=8, X=4 (or (X, Y) combinations including X=8 or X=4) are defined in the specifications for per-X monitoring for 960 kHz SCS, even if the terminal reports that it supports X=8 but does not report that it supports X=4, the base station can perform SS set configuration based on X=4. When the SS set configuration is performed based on X=4, SS set configuration parameters such as period, offset, and interval are set and / or indicated as one of multiples of 4. Alternatively, when the SS set configuration is performed based on X=4, the base station defines a value set of parameters such as (for example) period, offset, and interval according to values ​​consisting of multiples of 4, and sets and / or indicates one of these values ​​to the terminal.

[0111] As another example, when X=8, X=4 (or (X, Y) combinations including X=8 or X=4) are defined in the specifications for per-X monitoring for a 960 kHz SCS, X=8 is a mandatory support element that a terminal must support, and X=4 is an optional support element that only some terminals may support. In this situation, even if the terminal does not report that it supports the optional support element X=4, X=4 is a value that allows operations defined in the specifications for the corresponding SCS, and therefore SS set configuration (e.g., period, offset, and / or interval, etc.) can be performed based on X=4.

[0112] For example, when (X, Y) for per-X monitoring for 480 / 960kHz is defined as follows:

[0113] [Table 7]

[0114] The SS set is determined based on X=4 for the 480 kHz SCS, and based on X=4 for the 960 kHz SCS. If (2, 1) is added to the (X, Y) combinations selectively supported for 480 kHz, the SS set for 480 kHz is determined based on X=2.

[0115] Furthermore, for per-X monitoring operation for multiple cells, (instead of SS set configuration being based on the minimum value of reported X values ​​as in Proposal 2 described later), SS set configuration is performed based on the minimum value of X values ​​supported by per-X monitoring for each SCS (regardless of whether a specific X value is reported by the terminal and / or regardless of mandatory / optional support X) in a similar manner to Proposal 1a. When SS set configuration is performed based on the minimum value of supported X values, a parameter of SS set configuration is set by one of multiple values ​​of the minimum value of X. Alternatively, the base station configures and / or instructs the terminal to one of value sets consisting of multiple values ​​of the minimum value of X.

[0116] Although the proposed content is described as being applied to Group 1 SS, the SS set type is not limited to Group 1 SS. For example, the proposed content may be applied only to Type-3 CSS set and / or UE specific SS.

[0117] (Proposal 2) For per-X monitoring operation (for multiple cells), when X is different for each cell, the configuration (period, offset, and / or period) for group 1 SS is set based on the minimum value of X for each cell, and the terminal determines the PDCCH MO based on this minimum X value.

[0118] When per-X monitoring (for multiple cells) is configured in the terminal, X may be different for each cell. For example, for two cells configured with 960 kHz SCS, if X=4 is configured for cell#0 and X=8 is configured for cell#1, MO for cell#0 exists every 4 slots (period is a multiple of 4), and MO for cell#1 exists every 8 slots (period is a multiple of 8). Therefore, in order to monitor both cell#0 and cell#1, the terminal needs to operate assuming MO with X=4, which corresponds to the common denominator (or minimum value) of the two X values. That is, for multiple cell operation having different X values, SS set configuration for group 1 SS for per-X monitoring operation is configured based on the minimum value of the X values ​​for each cell. In addition, the terminal determines MO assuming that SS configuration (e.g., period, offset, and / or interval) has been performed based on the minimum value of the X values.

[0119] Furthermore, the terminal may be instructed by the base station (via RRC or DCI) of an X value that is a reference for SS set configuration (all or part of period, offset, and duration) for per-X monitoring operation for multiple cells. For example, the X value configured for each cell may be explicitly provided to the terminal, or may be implicitly provided to the terminal via a search space configuration for the cell (or BWP). The terminal recognizes that the SS set configuration is performed by the instructed X value (i.e., the configured X value), and determines the MO accordingly. In this case, the minimum value of these X values ​​is the basic value (which can be used when not instructed by the base station).

[0120] The proposed method is not limited to the case where per-X monitoring operates for multiple cells. That is, the proposed method is similarly applied to per-X monitoring for a single cell. In addition, the proposed method described above is not limited to the case where all Xs are different for each cell even when per-X monitoring operates for multiple cells. That is, it is similarly applied to the case where all Xs are the same for each cell, all Xs are different for each cell, Xs for some cells are the same and Xs for other some cells are different, etc. It will be fully understood by those skilled in the art that some expressions of the proposed method described above do not necessarily mean only the situation limited by the above expressions.

[0121] (Proposal 3) When X is different for each cell for per-X monitoring operation (for multiple cells), the configuration (period, offset, and / or interval) for group 2 SS is set based on X=1 (i.e., slot unit) or the minimum value of the X values ​​for each cell, and the terminal determines the PDCCH MO based on X=1 or the minimum value of the X values ​​for each cell.

[0122] Group 2 SS corresponds to an SS set type used when only cell-specific RRC configuration is configured (for any terminal) without dedicated RRC configuration, or an SS set type configured in common to multiple terminal groups. Thus, when a parameter value of an SS set configuration (e.g., period, offset, and / or interval) for per-X monitoring for multiple cells is configured based on a specific X value for an SS set belonging to group 2 SS, a terminal that does not support the specific X value may not be able to accurately and completely determine the MO location. To solve this problem, SS set configuration is performed for group 2 SS using one of the following three methods. The following methods may be applied to all SS set types belonging to group 2 SS, or some methods may be applied only to a specific SS set type.

[0123] (Method 3-1) SS set configuration (e.g., period, offset, and / or section) is performed based on X=1, and the terminal determines the MO assuming that the SS set configuration is performed based on X=1. In this case, the meaning of setting based on X=1 can be understood as the meaning of setting the SS set on a slot-by-slot basis, similar to conventional per-slot monitoring.

[0124] (Method 3-2) SS set configuration (e.g., period, offset, and / or section) is performed based on the minimum X value at which per-X monitoring operation is set for a specific SCS. The terminal determines the MO assuming that the SS set configuration of the per-X monitoring operation for a specific SCS is performed based on the minimum X value at which per-X monitoring operation is set for the specific SCS. For example, for per-X monitoring operating at 960 kHz SCS, if the X value for each cell is only X=8 or X=4, the SS set configuration for group 2 SS in per-X monitoring for multiple cells is performed based on X=4, and the terminal determines the MO position assuming this.

[0125] (Method 3-3) For an SS set type commonly set for multiple terminal groups, SS set configuration (e.g., period, offset, and / or section) is performed based on the minimum value of all X values ​​that terminals included in the terminal group can report. For example, if the minimum value of X values ​​reported by terminal #1 for a specific SCS of a specific cell is 4 and the minimum value of X values ​​reported by terminal #2 for a specific SCS of a specific cell is 8, SS set configuration for a specific SCS of a specific cell is performed based on 4. The terminal determines the MO on the assumption that SS set configuration for per-X monitoring operation for a specific SCS is performed based on the minimum value of X values ​​that can be reported.

[0126] The proposed method is not limited to the case where per-X monitoring operates for multiple cells. That is, the proposed method is similarly applied to per-X monitoring for a single cell. In addition, the proposed method described above is not limited to the case where all Xs are different for each cell even when per-X monitoring operates for multiple cells. That is, it is similarly applied to the case where all Xs are the same for each cell, all Xs are different for each cell, Xs for some cells are the same and Xs for other some cells are different, etc. It will be fully understood by those skilled in the art that some expressions of the proposed method described above do not necessarily mean the situation limited by the above expressions.

[0127] (Proposal 4) When multiple X values ​​are available for a cell, or when the X values ​​are different for each cell in a multi-cell situation, SS set group switching is performed at the slot-group boundary corresponding to the maximum X. Here, cells with different X may refer to cells that belong to the same cell group for SSSG switching.

[0128] SSSG (search space set group) switching is a feature introduced in rel-16 NR-U, and is a method in which a terminal varies the operation period of PDCCH monitoring according to the ID (or index) of an SSSG (different SS set settings may be made for each group) when a group including a specific (single or multiple) SS set setting is predefined. In some scenarios (e.g., NR rel-16), SSSG switching is applied in type-3 CSS sets and USS.

[0129] For example, referring to 3GPP TS 38.213 Rel-16, the terminal is provided with group indexes for each (respective) type-3 CSS set or USS set by the base station through the RRC parameter searchSpaceGroupIdList for PDCCH monitoring on the serving cell. This RRC parameter searchSpaceGroupIdList is provided to the terminal by being included in an RRC configuration (e.g., IE SearchSpace) that defines how / where to search for PDCCH candidates, and this RRC parameter searchSpaceGroupIdList is a list of search space group IDs to which the search space defined by the IE SearchSpace is related. For example, the network configures two search space groups with search space group IDs of 0 or 1, or configures three search space groups with search space group IDs of 0, 1, or 2. One search space set belongs to one SSSG or multiple SSSGs. If one search space set belongs to both the SSSG before SSSG switching and the SSSG after SSSG switching, the search space set continues to be used for PDCCH monitoring even if SSSG switching occurs. If the terminal is not provided with a searchSpaceGroupIdList for a search space set, SSSG switching is not applied to PDCCH monitoring by the search space set. If the terminal is provided with an RRC parameter cellGroupsForSwitchList indicating one or more serving cell groups by the base station, SSSG switching is applied to all serving cells in each group, otherwise, SSSG switching is applied only to serving cells for which the terminal is provided with a searchSpaceGroupIdList.Here, the RRC parameter cellGroupsForSwitchList is a list of serving cells bundled for the purpose of SSSG switching, where the serving belongs to only one cellGroupForSwitch, and the network configures the same list for all BWPs of serving cells in the same cellGroupForSwitch. When the terminal is provided with searchSpaceGroupIdList, the terminal resets PDCCH monitoring according to the search space set with group index 0 if searchSpaceGroupIdList is provided. In some implementations of the present invention, a time value or number of symbols required until SSSG switching after SSSG switching is notified or triggered is provided to the terminal by the base station, or a minimum number of symbols P. switch is predefined for each SCS setting. For example, the number of symbols P switch is provided from the base station to the terminal. P switch The minimum values ​​of x are provided, for example, for terminal processing capability 1 and terminal processing capability 2, and SCS settings u=0, 1, 2, as shown in the table below.

[0130] [Table 8]

[0131] The terminal is provided by the base station with a timer value for the serving cell for which searchSpaceGroupIdList is provided or, if provided, for the set of serving cells provided by cellGroupsForSwitchList. The base station sets the same searchSpaceSwitchTimer value for all serving cells belonging to the same cellGroupForSwitch. The terminal decrements the timer value by 1 after each slot based on a reference SCS setting, where the reference SCS setting is the smallest SCS setting u of all configured DL BWPs in the serving cell or in the set of serving cells. If the terminal is provided by the base station with the location of the search space set group (SSSG) switching flag for the serving cell in DCI format 2_0 (or for the set of serving cells provided by cellGroupsForSwitchList) by the base station with the RRC parameter SearchSpaceSwitchTrigger:

[0132] > If the terminal detects DCI format 2_0 and the value of the SSSG switching flag in DCI format 2_0 is 0, the terminal shall switch start monitoring the PDCCH according to the search space set having group index 0, and stop monitoring the PDCCH according to the search space set having group index 1, for the serving cell in the first slot after this number of symbols have passed;

[0133] > If the terminal detects DCI format 2_0 and the value of the SSSG switching flag in DCI format 2_0 is 1, the terminal shall switchstart monitoring the PDCCH according to the search space set having group index 1 for the serving cell in the first slot after symbols have passed, and stop monitoring the PDCCH according to the search space set having group index 0, and the terminal sets a timer value according to a value provided by searchSpaceSwitchTimer;

[0134] > When the terminal monitors the PDCCH for the serving cell according to the search space set with group index 1, the terminal shall monitor the PDCCH for the serving cell according to the search space set with group index 1 for at least one second after the slot in which the timer expires or, if indicated by DCI format 2_0, after the last symbol of the remaining channel occupancy duration for the serving cell. switch At the beginning of the first slot after this number of symbols, for the serving cell, start monitoring the PDCCH according to the search space set with group index 0 and stop monitoring the PDCCH according to the search space set with group index 1.

[0135] For each serving cell in the set of serving cells, the base station provides the terminal with the location of the SSSG switching flag field in DCI format 2_0 by the RRC parameter SearchSpaceSwitchTrigger, where the SSSG switching flag indicates a group from the search space set for PDCCH monitoring for scheduling for that serving cell, or for a set of serving cells provided by the RRC parameter cellGroupsForSwitchList. Each SearchSpaceSwitchTrigger value provides the location in that DCI format of a bit field indicating the SSSG switching flag for the serving cell, or for a group of serving cells (e.g. a set of serving cells belonging to the same cellGroupForSwitch) if cellGroupsForSwitchList is set. In some implementations, for each serving cell in the set of serving cells, the terminal receives from the base station the location of a channel occupancy (CO) duration field in DCI format 2_0 provided by the RRC parameter co-DurationsPerCell, and the CO duration field provides a value from the RRC parameter co-DurationList to indicate the remaining CO duration for the serving cell starting from the first symbol of the slot in which the terminal detects DCI format 2_0. The CO duration field is defined as max{ceil( log2 (COdurationListSize), 1} bits, where COdurationListSize is the number of values ​​provided by the co-DurationList.

[0136] If the terminal does not provide a SearchSpaceSwitchTrigger for the serving cell:

[0137] > When the terminal detects the DCI format by monitoring the PDCCH according to the search space set of group index 0, the terminal switch In the first slot after symbols have passed, for the serving cell, start monitoring the PDCCH according to the search space set having group index 1, and stop monitoring the PDCCH according to the search space set having group index 0; if the terminal detects a DCI format by monitoring the PDCCH in any search space set, the terminal sets a timer value according to a value provided by searchSpaceSwitchTimer;

[0138] > When the terminal monitors the PDCCH for the serving cell according to the search space set of group index 1, the terminal shall monitor the PDCCH for the serving cell according to the search space set of group index 1 after the slot in which the timer expires or, if a search space set for monitoring the PDCCH for detecting DCI format 2_0 is provided, after the last symbol of the remaining channel occupancy period for the serving cell as indicated by DCI format 2_0. switch At the beginning of the first slot after symbols have passed, for the serving cell, start monitoring the PDCCH according to the search space set with group index 1 and stop monitoring the PDCCH according to the search space set with group index 0, and if the terminal detects a DCI format by monitoring the PDCCH in any search space set, the terminal sets a timer value according to the value provided by searchSpaceSwitchTimer.

[0139] According to 3GPP TS 38.213 Rel-16, the terminal determines, for a serving cell for which searchSpaceGroupIdList is provided or for a set of serving cells if cellGroupsForSwitchList is provided, the slot and the symbol within the slot at which to start or stop PDCCH monitoring according to the search space set based on the smallest SCS configuration u of all configured DL BWPs in the serving cell or in the set of serving cells and, if present, in the serving cell in which the terminal receives a PDCCH and detects said DCI format 2_0 used to notify start or stop PDCCH monitoring according to the search space set.

[0140] As described above, for per-slot monitoring, switching between different SSSGs occurs at slot boundaries. For example, after SSSG switching is notified or triggered, switch PDCCH monitoring is performed according to the changed SSSG from the first slot after the above symbols. However, in the case of per-X monitoring, if the SS set setting is changed in the middle of a slot-group, the complexity of the terminal increases. To avoid this, switching between SSSGs must be performed at the slot-group boundary.

[0141] Meanwhile, when a multi-cell operation is configured in the UE, X for per-X monitoring may be different for each cell. In this case, the SSSG switching time is determined by two different methods. In the method described below, cells having different Xs refer to cells belonging to the same cell group for SSSG switching.

[0142] 4 and 5 illustrate search space set group switching according to some implementations of the present invention.

[0143] (Method 4-1) When the X value is different for each cell, SSSG switching is performed at the boundary of X (i.e., slot-group) which is different for each cell. For example, when cell#0 has X=4 and cell#1 has X=8, a situation is considered in which both cell#0 and cell#1 are switched from SSSG#0 to SSSG#1 through one SSSG switching trigger. After switching is triggered, both cell#0 and cell#1 are P switch PDCCH monitoring by SSSG#1 can start at the first slot-group boundary after the symbol has passed, but since the slot-group of cell#0 consists of 4 slots and the slot-group of cell#1 consists of 8 slots, the actual time of switching to SSSG#1 may differ from each other, as shown in Figure 4.

[0144] (Method 4-2) Even if the X values ​​are different for each cell, all cells monitored by the terminal perform SSSG switching at the X boundary (i.e., slot-group boundary) based on the reference X. The reference X may be the maximum X among the X values ​​that the terminal can support (or among the X values ​​of the cells monitored by the terminal). For example, in the situation of cell #0 and cell #1 illustrated in method 4-1, if SSSG switching is performed based on X=8 of cell #1, cell #0 is also changed to SSSG #1 at the slot-group boundary of cell #1 (see FIG. 4). As another example, referring to FIG. 5, when multiple X values ​​are available for a single SCS or a single cell, SSSG switching is performed at the slot-group boundary based on the maximum X value among the multiple available X values. According to SSSG method 4-2, SSSG switching is performed at the same time for all cells (belonging to CellGroupForSwitch) monitored by the terminal and for all search space sets for which SSSG switching is configured. In other words, according to some embodiments of the present invention, even if a cell for multi-slot PDCCH monitoring (i.e., per-X monitoring) is configured in a terminal, SSSG switching is performed at the same time for a search space set of cells, and for all cells in a cell group when a cell group is configured for SSSG switching. This allows the base station and the terminal to more efficiently use unlicensed spectrum, and simplifies the implementation of the terminal. Effects obtained by aligning the SSSG switching time for a search space set or for multiple cells are, for example, as follows: SSSG switching is used before and after the CO period from an unlicensed band (or shared spectrum) to a CO period (channel occupancy duration) in order to reduce the frequency of PDCCH monitoring.In a transmission process using multiple cells such as CA, the CO intervals for multiple cells are set to end simultaneously. In this case, the SSSG switching points between search space sets or cells can be aligned, which has the advantage of simplifying the operation of the terminal.

[0145] In some embodiments of the present invention, P switchmay be a value provided by the base station to the terminal, or may be a value predefined by SCS configuration u. In some implementations of the present invention, for a serving cell for which an SSSG flag field in DCI format 2_0 is provided by searchSpaceSwitchTrigger, the terminal determines that SSSG switching is triggered i) at the last symbol of a PDCCH having DCI format 2_0 if it detects DCI format 2_0 with a value of 0 or 1 in the SSSG switching flag field, or ii) at the slot where a timer expires according to a timer value provided by searchSpaceSwitchTimer if it monitors a PDCCH for the serving cell according to a search space set of group index 1, or at the last symbol of the remaining CO period for the serving cell if indicated by DCI format 2_0. In some implementations of the present invention, if searchSpaceSwitchTrigger is not provided for a serving cell, the terminal determines that SSSG switching is triggered i) at the last symbol of a PDCCH having a DCI format when monitoring a PDCCH according to a search space set with group index 0 to detect a DCI format, ii) at the slot where a timer expires according to a timer value provided by searchSpaceSwitchTimer when monitoring a PDCCH for a serving cell according to a search space set with group index 1, or at the last symbol of the remaining CO period for a serving cell when indicated by DCI format 2_0 when a search space set is provided for the terminal to monitor a PDCCH to detect DCI format 2_0. In some implementations of the present invention, the terminal determines that SSSG switching is triggered at least P after the symbol or slot where SSSG switching is triggered. switchWhen SSSG switching is triggered at the beginning of the first slot of a slot-group after this symbol, SSSG switching is performed by stopping PDCCH monitoring with the search space set of the SSSG being monitored and starting PDCCH monitoring with the search space set of another SSSG.

[0146] Furthermore, it is also possible to flexibly change method 4-1 and method 4-2. That is, the base station instructs the terminal whether the SSSG switching time of each cell is a boundary of X that differs from cell to cell or a boundary of a reference X (for example, maximum X) through higher layer signaling such as RRC. Alternatively, a 1-bit field is added to DCI format 2_0 used to notify SSSG switching, and information referring to either method 4-1 or method 4-2 is transmitted through the added 1-bit field. This has the advantage that when an individual CO section is obtained for each beam, the SSSG switching time can be set individually for each beam. As another method, either method 4-1 or method 4-2 may be pre-defined according to the SSSG switching trigger type. For example, when switching is notified or triggered by DCI 2_0, the switching time of all cells is aligned with the boundary of maximum X, and when switching is triggered by the expiration of the SSSG switching timer, SSSG switching is performed at different X boundaries for each cell. Alternatively, when entering the CO section in an unlicensed band (or shared spectrum) operation, SSSG switching is performed for each cell at the X boundary of each cell, and when switching is triggered due to the end of the CO section, it is also possible to match the switching time according to the maximum X in all cells. This reduces unnecessary power consumption during the CO section, and reduces the complexity of the terminal operation by performing SSSG switching at the same time for all cells when the CO section ends.

[0147] (Proposal 5) SSSG switching boundary alignment method for cells belonging to CellGroupForSwitch

[0148] (5-1) To align the SSSG switching boundaries of cells that belong to / are included in CellGroupForSwitch, one of the following methods is applied. Hereinafter, Xs has the same meaning as X in the proposal above.

[0149] >> Sort by the maximum Xs of all configured BWPs for all cells in the same CellGroupForSwitch

[0150] >> Sort by maximum Xs among all active BWPs for all cells in the same CellGroupForSwitch

[0151] >> Sort by the maximum Xs of all reported Xs values ​​by the device.

[0152] (5-2) When only one serving cell is included in CellGroupForSwitch, or when CellGroupForSwitch is not set (i.e., when there is a single serving cell), if the Xs value set for each DL (or UL) BWP is different, the SSSG switching boundary may be aligned based on the maximum Xs value (see FIG. 5). For example, it is shown as follows.

[0153] >> Sort by maximum Xs among all configured / active BWP or reported Xs values

[0154] (5-3) In some implementations, cells collected by CellGroupForSwitch can be restricted to have the same Xs for each SCS (or only cells with the same Xs are configured by CellGroupForSwitch). For example, a terminal (configured with 480 / 960 kHz) may not expect cells (or the BWPs of the cells) with the same SCS but different configured Xs to be collected by the same CellGroupForSwitch.

[0155] In Proposal 5, the configured Xs is an Xs value explicitly or implicitly provided by the base station to the terminal. For example, the base station may implicitly provide the terminal with an explicit Xs value for the cell (or BWP or SCS), or may provide the terminal with the configured Xs for the cell (or BWP or SCS) implicitly by the search space configuration. The terminal determines the configured Xs value for the cell (or BWP or SCS) based on the explicitly provided Xs value or the Xs associated with the search space set configured for the cell (or BWP or SCS).

[0156] Furthermore, as described above, the SSSG switching delay (or switching time) of the cells belonging to CellGroupForSwitch may be determined based on the SCS of all configured BWPs configured in the terminal, or may be determined based on the SCS of all active BWPs among the BWPs configured in the terminal. That is, when the SCSs configured in the cells (or BWPs) included in CellGroupForSwitch are different, the cells belonging to CellGroupForSwitch are simultaneously SSSG switched at the slot boundary of the SCS corresponding to the minimum value of the SCSs of each cell (i.e., the minimum value of the SCSs of the cells belonging to CellGroupForSwitch). At this time, the SCSs configured in all configured BWPs or the SCSs configured in all active BWPs are used as the SCS of each cell. For this purpose, an RRC configuration that configures / indicates / selects one of the two criteria is introduced.

[0157] Furthermore, for per-X monitoring operation, the terminal operates as follows: or is configured (by the base station via RRC, etc.) to operate as follows.

[0158] For a terminal configured for per-X monitoring, for some CSSs (e.g., CSSs such as type 0 / OA), the terminal is configured to monitor in the entire slot-group of size X, and for some other CSSs (e.g., CSSs of type 3) and / or terminal-specific SSs (i.e., USSs), the terminal is configured to monitor only in specific / some Y slots within X slots. In this case, for a specific CSS type to be monitored in any slot among the slot-group of size X, for a terminal-specific RNTI (e.g., C-RNTI and / or MCS-C-RNTI and / or CS-RNTI), it is predefined to monitor only in the Y slots, or configured (by the base station to the terminal) via RRC, etc. Alternatively, the terminal may report to the base station that it is a terminal capable of operating / preferred by the terminal's capability report.

[0159] In some implementations, the above-mentioned "configured X", "configured X", "configured Xs", "commanded Xs", "configured slot-group size" or "commanded slot-group size" is determined based on a search space configuration provided to the terminal by the base station.

[0160] On the other hand, the contents of the present invention are not limited to transmission and reception of uplink and / or downlink signals. For example, the contents of the present invention can also be used for direct communication between terminals. Furthermore, the base station in the present invention is a concept that includes not only a base station but also a relay node. For example, the operation of the base station in the present invention may be performed by the base station, but may also be performed by a relay node.

[0161] Since the above-mentioned example of the proposed method is also included as one of the implementation methods of the present invention, it is obvious that it is regarded as a kind of proposed method. Also, the above-mentioned proposed methods may be implemented independently, or may be implemented by combining (or merging) some of the proposed methods. Rules may be defined so that the base station notifies the terminal of the suitability of the proposed method (or information on the rules of the proposed method) or the transmitting terminal notifies the receiving terminal of the suitability of the proposed method via a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0162] Example

[0163] 6 and 7 are flowcharts of a signal transmitting and receiving method according to an embodiment of the present invention.

[0164] Referring to FIG. 6, some implementations of the present invention are performed by executing instructions stored in a terminal or a memory in a terminal or a device for the terminal, or by executing instructions or a program stored in a non-volatile storage medium. The terminal or operation by the instructions / program performs PDCCH monitoring according to a search space set of a first SSSG having a first group index for a serving cell or serving cell set (e.g., serving cells belonging to the same cellGroupForSwitch) (S601). During the PDCCH monitoring according to the search space set of the first SSSG, the terminal recognizes that SSSG switching has been notified or triggered according to some implementations of the present invention. For example, the terminal or operation detects a DCI format notifying SSSG switching for a serving cell or serving cell set, or determines that SSSG switching has been triggered based on the expiration of a timer related to SSSG switching, or the end of a remaining CO period. The terminal determines an SSSG switching time point for the notified / triggered SSSG switching (S603). In some implementations, the terminal or operation determines the SSSG switching time based on a slot-group size (hereinafter, Xs) for a serving cell or a serving cell set. At the SSSG switching time, the terminal or operation stops PDCCH monitoring according to a search space set of a first SSSG and starts PDCCH monitoring according to a search space set of a second SSSG having a second group index different from the first group index (S605).

[0165] In some implementations, in addition to the operations described with respect to FIG. 6, one or more of the operations described with respect to FIGS. 1-5 and / or the operations described in section 1 above may be performed in combination.

[0166] Referring to FIG. 7, some embodiments of the present invention are performed by executing instructions stored in a memory in a base station or in a device for a base station, or by executing instructions or programs stored in a non-volatile storage medium. The base station or the operation by the instructions / program performs PDCCH transmission according to a search space set of a first SSSG having a first group index for a serving cell or a serving cell set (e.g., serving cells belonging to the same cellGroupForSwitch) (S701). During the execution of PDCCH transmission according to the search space set of the first SSSG, the base station or the operation notifies SSSG switching according to some embodiments of the present invention or recognizes that SSSG switching has been triggered. For example, the base station or the operation transmits a DCI format that triggers SSSG switching for a serving cell or a serving cell set, or determines that SSSG switching has been triggered based on the expiration of a timer related to SSSG switching or the end of a remaining CO period. The base station or the operation determines an SSSG switching time point for the triggered SSSG switching (S703). In some implementations, the base station or operation determines the SSSG switching time based on a slot-group size (hereinafter, Xs) for a serving cell or a serving cell set. The base station or operation stops transmitting the PDCCH according to the search space set of the first SSSG at the SSSG switching time, and starts transmitting the PDCCH according to the search space set of the second SSSG having a second group index different from the first group index (S705).

[0167] In some implementations, a search space configuration including a first group index of the first SSSG and a second group index of the second SSSG is provided by the base station to the terminal.

[0168] In some implementations, the terminal or base station or operation determines the SSSG switching point based on the maximum Xs among the Xs values ​​for the serving cell or serving cell set when per-X PDCCH monitoring is performed for the serving cell or serving cell set.

[0169] In some embodiments, the SCS of a serving cell or a serving cell set where per-X PDCCH monitoring is performed is 960 kHz. In some embodiments, the SCS of a serving cell or a serving cell set where per-X PDCCH monitoring is performed is 480 kHz. In some embodiments, the SCS of a serving cell set where per-X PDCCH monitoring is performed is 480 kHz and / or 960 kHz.

[0170] In some implementations, the terminal or operation includes receiving a search space configuration for at least one serving cell (e.g., a serving cell or a serving cell set), the search space configuration including a configuration for at least one search space set belonging to a first search space set group (SSSG) having at least a first group index and a configuration for at least one search space set belonging to a second SSSG having a second group index, performing physical downlink control channel (PDCCH) monitoring according to the search space set of the first SSSG for the at least one serving cell based on the search space configuration, and performing SSSG switching based on detecting a DCI format notifying the at least one serving cell of SSSG switching or based on expiration of a timer for SSSG switching. In some implementations, based on at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching includes performing a PDCCH monitoring according to the search space set of the first SSSG for the at least one serving cell based on the search space configuration, and performing a PDCCH monitoring according to the search space set of the first SSSG for the at least one serving cell based on detecting a DCI format notifying the at least one serving cell of SSSG switching or based on expiration of a timer for SSSG switching.switch At the beginning of a first slot of a slot-group of Xs slots after symbols, i) stopping PDCCH monitoring according to a search space set of the first SSSG, and ii) starting PDCCH monitoring according to a search space set of the second SSSG, where the slot-groups of Xs slots are consecutive. In some implementations, based on at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the terminal or operation determines a slot and a symbol within the slot at which to stop or start PDCCH monitoring for SSSG switching based on a maximum Xs value among the Xs values ​​for at least one serving cell (e.g., Xs values ​​associated / configured for at least one serving cell).

[0171] In some implementations, the base station or operation includes transmitting a search space configuration for at least one serving cell (e.g., a serving cell or a serving cell set), the search space configuration including a configuration for at least one search space set belonging to a first search space set group (SSSG) having at least a first group index and a configuration for at least one search space set belonging to a second SSSG having a second group index, transmitting at least one physical downlink control channel (PDCCH) according to the search space set of the first SSSG for the at least one serving cell based on the search space configuration, and performing SSSG switching based on transmitting a DCI format notifying the at least one serving cell of SSSG switching or based on expiration of a timer for SSSG switching. In some implementations, based on at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching includes performing a PDCCH switching operation based on at least a predetermined number P of symbols from a last symbol of a PDCCH having a DCI format. switch At the beginning of a first slot of a slot-group of Xs slots after symbols, i) stopping transmitting at least one PDCCH according to a search space set of the first SSSG, and ii) starting transmitting at least one PDCCH according to a search space set of the second SSSG, where the slot-groups of Xs slots are contiguous. In some implementations, based on at least one serving cell including a serving cell having a subcarrier spacing of 960 kHz, the base station or operation determines a slot and a symbol within the slot at which SSSG switching is to occur based on a maximum Xs value among Xs values ​​for at least one serving cell (e.g., Xs value associated / configured with at least one serving cell).

[0172] In some implementations, a cell group configuration for switching is provided to the terminal by the base station. When the cell group configuration for switching is provided, at least one serving cell is a serving cell set. Based on the cell group configuration for switching, SSSG switching is performed for all serving cells in the serving cell set.

[0173] In some implementations, the cell group configuration for the switch is a radio resource control (RRC) parameter cellGroupForSwitch.

[0174] In some implementations, a predetermined number P switch The base station provides information about the

[0175] In some implementations, a predetermined number P switch is predefined for a subcarrier spacing of 960 kHz and the processing capability of the terminal.

[0176] In some implementations, each search space set in the first SSSG and the second SSSG is set based on one of the Xs values ​​for the at least one serving cell.

[0177] In some implementations, each of the Xs values ​​for the at least one serving cell is associated with a search space set configured for the at least one serving cell.

[0178] In some implementations, information regarding the location of the SSSG flag field in the DCI format for at least one serving cell is provided to the terminal by the base station.

[0179] In some implementations, the DCI format is DCI format 2_0.

[0180] An example of a communication system to which the present invention is applied

[0181] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or flow charts of the present invention disclosed herein may be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0182] Hereinafter, a more detailed description will be given with reference to the drawings. In the following drawings / description, the same reference numerals denote the same or corresponding hardware blocks, software blocks or function blocks, unless otherwise specified.

[0183] FIG. 8 illustrates a communication system 1 to which the present invention is applied.

[0184] Referring to FIG. 8, the communication system 1 applied to the present invention includes wireless devices, base stations, and networks. Here, the wireless devices refer to devices that communicate using wireless connection technology (e.g., 5G NR, LTE), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, vehicles 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held device) 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication functions, autonomous vehicles, vehicles capable of inter-vehicle communication, and the like. Here, the vehicles include UAVs (Unmanned Aerial Vehicles) (e.g., drones). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital billboards, vehicles, robots, etc. Portable devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebook computers, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0185] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. AI (Artificial Intelligence) technology is applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, the vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, an IoT device (e.g., a sensor) can directly communicate with another IoT device (e.g., a sensor) or another wireless device 100a to 100f.

[0186] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f / base stations 200 and the base stations 200. Here, the wireless communication / connections are performed by various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication) and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and base stations, and the base stations and base stations can transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, based on various proposals of the present invention, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed.

[0187] Examples of wireless devices to which the present invention can be applied

[0188] FIG. 9 illustrates a wireless device to which the present invention can be applied.

[0189] 9, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals according to various wireless access technologies (e.g., LTE, NR), where {first wireless device 100, second wireless device 200} corresponds to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG.

[0190] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate a first information / signal, and then transmits a wireless signal including the first information / signal via the transceiver 106. The processor 102 also receives a wireless signal including a second information / signal via the transceiver 106, and then stores information obtained from signal processing of the second information / signal in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as an RF (radio frequency) unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0191] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate a third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from the signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0192] The hardware elements of the wireless device 100, 200 are described in more detail below. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP, etc.). One or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. One or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein to the one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed herein.

[0193] The one or more processors 102, 202 may also be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, the one or more processors 102, 202 may include one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like. The firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202, or may be stored in one or more memories 104, 204 and run by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed herein may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0194] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various forms of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0195] One or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, etc., as described in the methods and / or flow charts, etc., herein to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, suggestions, methods and / or flow charts, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 may be coupled to one or more processors 102, 202 and may transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Also, the one or more transceivers 106, 206 are coupled to one or more antennas 108, 208, and the one or more transceivers 106, 206 are configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed herein, via the one or more antennas 108, 208. In this specification, the one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing using the one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed using the one or more processors 102, 202, from baseband signals to RF band signals. For this purpose, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0196] Examples of use of wireless devices to which this invention can be applied

[0197] 10 shows another example of a wireless device to which the present invention is applied. The wireless device may be embodied in various forms depending on the use case / service (see FIG. 8).

[0198] Referring to Fig. 10, the wireless devices 100, 200 correspond to the wireless devices 100, 200 of Fig. 9 and are composed of various elements, components, units / parts and / or modules. For example, the wireless devices 100, 200 include a communication unit 110, a control unit 120, a memory unit 130 and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102, 202 and / or one or more memories 104, 204 in Fig. 9. For example, the transceiver 114 includes one or more transceivers 106, 206 and / or one or more antennas 108, 208 in Fig. 9. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130 and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls electrical / mechanical operations of the wireless device based on the programs / codes / commands / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface, or stores information received from the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0199] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. The wireless device may be embodied in the form of, but not limited to, a robot (FIG. 8, 100a), a vehicle (FIG. 8, 100b-1, 100b-2), an XR device (FIG. 8, 100c), a mobile device (FIG. 8, 100d), a home appliance (FIG. 8, 100e), an IoT device (FIG. 8, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a Fintech device (or financial device), a security device, a climate / environment device, an AI server / device (FIG. 8, 400), a base station (FIG. 8, 200), and a network node. The wireless device may be mobile or fixed depending on the use case / service.

[0200] In FIG. 10, the various elements, components, units / sections and / or modules within the wireless devices 100, 200 are all coupled to each other by wired interfaces or at least some are wirelessly coupled to each other by a communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and a first unit (e.g., 130, 140) are connected wirelessly via the communication unit 110. In addition, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is composed of a set of one or more processors. For example, the control unit 120 is composed of a set of a communication control processor, an application processor, an ECU (Electronic control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 is composed of a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0201] Examples of vehicles or autonomous vehicles to which the present invention can be applied

[0202] 11 is a diagram illustrating a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be realized as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0203] 11, a vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 10, respectively.

[0204] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a causes the vehicle or autonomous vehicle 100 to run on the ground. The driving unit 140a includes an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d embodies a technology for maintaining a lane while driving, a technology for automatically adjusting speed such as an adaptive cruise control, a technology for automatically driving according to a predetermined route, a technology for automatically setting a route when a destination is set, and the like.

[0205] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a drive plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., speed / direction adjustment) so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving route according to the drive plan. The communication unit 110 non-periodically obtains the latest traffic information data from an external server during autonomous driving, and also obtains surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and the drive plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, the autonomous driving route, the drive plan, etc. to the external server. The external server can predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0206] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be interpreted as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

[0207] As mentioned above, the present invention can be applied to a variety of wireless communication systems.

Claims

1. A method for monitoring a control channel by a terminal in a wireless communication system, comprising: receiving a search space configuration for a serving cell set including at least one serving cell, the search space configuration including at least one search space set belonging to a first search space set group (SSSG) having a first group index and at least one search space set belonging to a second SSSG having a second group index; performing physical downlink control channel (PDCCH) monitoring according to a search space set of the first SSSG for the serving cell set based on the search space configuration; and performing the SSSG switching based on detection of a downlink control information (DCI) format for notifying the serving cell set of SSSG switching; Based on the serving cell set including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is At least a predetermined number P from the last symbol of the PDCCH having the DCI format switch At a beginning of a first slot of a slot-group of Xs slots after symbols, i) stopping the PDCCH monitoring according to the search space set of the first SSSG; and ii) starting the PDCCH monitoring according to the search space set of the second SSSG, where the slot-groups of the Xs slots are contiguous; Based on the fact that the serving cell set includes a serving cell having a subcarrier spacing of 960 kHz, the terminal determines a slot and a symbol within the slot in which to stop or start the PDCCH monitoring for the SSSG switching based on a maximum Xs value among the Xs values ​​for the serving cell set. A control channel monitoring method.

2. receiving a switch-directed cell group configuration for the serving cell set; Based on the cell group setting for the switch, the SSSG switching is performed on all serving cells in the serving cell set. The control channel monitoring method according to claim 1 .

3. The cell group setting for the switch is a radio resource control (RRC) parameter cellGroupForSwitch; The control channel monitoring method according to claim 2 .

4. The predetermined number P switch receiving information about The control channel monitoring method according to claim 1 .

5. The predetermined number P switch is predefined for the subcarrier spacing of 960 kHz and the processing capability of the terminal, The control channel monitoring method according to claim 1 .

6. Each search space set in the first SSSG and the second SSSG is configured based on one of the Xs values ​​for the serving cell set. The control channel monitoring method according to claim 1 .

7. Each of the Xs values ​​for the serving cell set is associated with a search space set configured for the serving cell set. The control channel monitoring method according to claim 1 .

8. Further comprising receiving information regarding a location of an SSSG flag field in the DCI format for the serving cell set; The DCI format is DCI format 2_0. The control channel monitoring method according to claim 1 .

9. A method for monitoring a control channel by a terminal in a wireless communication system, comprising: At least one transceiver; At least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations, said operations including: receiving a search space configuration for a serving cell set including at least one serving cell, the search space configuration including at least one search space set belonging to a first search space set group (SSSG) having a first group index and at least one search space set belonging to a second SSSG having a second group index; performing physical downlink control channel (PDCCH) monitoring according to a search space set of the first SSSG for the serving cell set based on the search space configuration; and performing the SSSG switching based on detection of a downlink control information (DCI) format for notifying the serving cell set of SSSG switching; Based on the serving cell set including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is At least a predetermined number P from the last symbol of the PDCCH having the DCI format switch at a start of a first slot of a slot-group of Xs slots after symbols i) ceasing the PDCCH monitoring according to the search space set of the first SSSG; and ii) starting the PDCCH monitoring according to the search space set of the second SSSG, where the slot-groups of Xs slots are contiguous; Based on the fact that the serving cell set includes a serving cell having a subcarrier spacing of 960 kHz, the terminal determines a slot and a symbol within the slot in which to stop or start the PDCCH monitoring for the SSSG switching based on a maximum Xs value among the Xs values ​​for the serving cell set. Terminal.

10. An apparatus for a terminal, comprising: At least one processor; and at least one computer memory operatively connected to the at least one processor and which, when executed, causes the at least one processor to perform operations, the operations including: receiving a search space configuration for a serving cell set including at least one serving cell, the search space configuration including at least one search space set belonging to a first search space set group (SSSG) having a first group index and at least one search space set belonging to a second SSSG having a second group index; performing physical downlink control channel (PDCCH) monitoring according to a search space set of the first SSSG for the serving cell set based on the search space configuration; and performing the SSSG switching based on detection of a downlink control information (DCI) format for notifying the serving cell set of SSSG switching; Based on the serving cell set including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is At least a predetermined number P from the last symbol of the PDCCH having the DCI format switch at a start of a first slot of a slot-group of Xs slots after symbols i) ceasing the PDCCH monitoring according to the search space set of the first SSSG; and ii) starting the PDCCH monitoring according to the search space set of the second SSSG, where the slot-groups of Xs slots are contiguous; Based on the fact that the serving cell set includes a serving cell having a subcarrier spacing of 960 kHz, the terminal determines a slot and a symbol within the slot in which to stop or start the PDCCH monitoring for the SSSG switching based on a maximum Xs value among the Xs values ​​for the serving cell set. Device.

11. A computer-readable non-volatile storage medium containing at least one computer program causing at least one processor to perform operations, said operations including: receiving a search space configuration for a serving cell set including at least one serving cell, the search space configuration including at least one search space set belonging to a first search space set group (SSSG) having a first group index and at least one search space set belonging to a second SSSG having a second group index; performing physical downlink control channel (PDCCH) monitoring according to a search space set of the first SSSG for the serving cell set based on the search space configuration; and performing the SSSG switching based on detection of a downlink control information (DCI) format for notifying the serving cell set of SSSG switching; Based on the serving cell set including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is At least a predetermined number P from the last symbol of the PDCCH having the DCI format switch at a start of a first slot of a slot-group of Xs slots after symbols i) ceasing the PDCCH monitoring according to the search space set of the first SSSG; and ii) starting the PDCCH monitoring according to the search space set of the second SSSG, where the slot-groups of Xs slots are contiguous; Based on the fact that the serving cell set includes a serving cell having a subcarrier spacing of 960 kHz, the terminal determines a slot and a symbol within the slot in which to stop or start the PDCCH monitoring for the SSSG switching based on a maximum Xs value among the Xs values ​​for the serving cell set. Storage medium.

12. A method for transmitting a control channel by a base station in a wireless communication system, comprising: Transmit a search space configuration for a serving cell set including at least one serving cell, the search space configuration including at least one search space set belonging to a first search space set group (SSSG) having a first group index and at least one search space set belonging to a second SSSG having a second group index; transmitting at least one physical downlink control channel (PDCCH) according to a search space set of the first SSSG for the serving cell set based on the search space configuration; and performing the SSSG switching based on a downlink control information (DCI) format that notifies the serving cell set of SSSG switching; Based on the serving cell set including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is At least a predetermined number P from the last symbol of the PDCCH having the DCI format switch at a start of a first slot of a slot-group of Xs slots after symbols, i) ceasing to transmit at least one PDCCH according to the search space set of the first SSSG, and ii) starting to transmit at least one PDCCH according to the search space set of the second SSSG, where the slot-groups of Xs slots are contiguous; Based on the fact that the serving cell set includes a serving cell having a subcarrier spacing of 960 kHz, the base station determines a slot in which the SSSG switching is performed and a symbol within the slot based on a maximum Xs value among the Xs values ​​for the serving cell set. Control channel transmission method.

13. A method for transmitting a control channel by a base station in a wireless communication system, comprising: At least one transceiver; At least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations, said operations including: Transmit a search space configuration for a serving cell set including at least one serving cell, the search space configuration including at least one search space set belonging to a first search space set group (SSSG) having a first group index and at least one search space set belonging to a second SSSG having a second group index; transmitting at least one physical downlink control channel (PDCCH) according to a search space set of the first SSSG for the serving cell set based on the search space configuration; and performing the SSSG switching based on a downlink control information (DCI) format that notifies the serving cell set of SSSG switching; Based on the serving cell set including a serving cell having a subcarrier spacing of 960 kHz, the SSSG switching is At least a predetermined number P from the last symbol of the PDCCH having the DCI format switch at a start of a first slot of a slot-group of Xs slots after symbols, i) ceasing to transmit at least one PDCCH according to the search space set of the first SSSG, and ii) starting to transmit at least one PDCCH according to the search space set of the second SSSG, where the slot-groups of Xs slots are contiguous; Based on the serving cell set including a serving cell having a subcarrier spacing of 960 kHz, the operation includes determining a slot and a symbol within the slot in which the SSSG switching is performed based on a maximum Xs value among the Xs values ​​for the serving cell set. Base station.

14. transmitting a cell group configuration for the switch for the serving cell set; Based on the cell group setting for the switch, the SSSG switching is performed on all serving cells in the serving cell set. The base station according to claim 13.

15. The cell group setting for the switch is a radio resource control (RRC) parameter cellGroupForSwitch; The base station of claim 14.

16. The predetermined number P switch further comprising transmitting information regarding The base station according to claim 13.

17. The predetermined number P switch is predefined for the subcarrier spacing of 960 kHz and the processing capability of the terminal, The base station according to claim 13.

18. Each search space set in the first SSSG and the second SSSG is configured based on one of the Xs values ​​for the serving cell set. The base station according to claim 13.

19. Each of the Xs values ​​for the serving cell set is associated with a search space set configured for the serving cell set. The base station according to claim 13.

20. Further comprising transmitting information regarding a position of an SSSG flag field in the DCI format for the serving cell set; The DCI format is DCI format 2_0. The base station according to claim 13.

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