Terminal and communication method

Abstract

To clarify the operation of a terminal when LP-WUS and SSSG switching coexist in a wireless communication system, and appropriately perform operations related to LP-WUS and SSSG switching.SOLUTION: A terminal includes a receiving unit that receives a low power wake-up signal from a base station and a control unit that sets information related to the low power wake-up signal in the terminal, and when SSSG switching is set in the terminal and a timer for PDCCH monitoring is running, the control unit determines an SCS to reference for the PDCCH monitoring on the basis of the SCS of the low power wake-up signal or the SCS of a specific BWP of a serving cell associated with the low power wake-up signal.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] In the NR (New Radio) / fifth generation mobile communication system (5G), technologies to further improve the utilization efficiency of radio resources and achieve power saving of terminals are being studied (for example, Non-Patent Document 1 and Non-Patent Document 2).

[0003] LP-WUS (Low Power Wake-Up Signaling), introduced in 3GPP (registered trademark) (3rd Generation Partnership Project) Release 17 (Rel-17) as a power-saving technology, reduces power consumption in idle state by monitoring wake-up signals from base stations even when the terminal is in sleep state.

[0004] On the other hand, SSSG (Search Space Set Group) switching is a technology that improves the reception performance of the control channel by dynamically switching the search space of the PDCCH (Physical Downlink Control Channel) monitored by the terminal. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 38.300 V18.3.0(2024-09) [Non-patent document 2] 3GPP TS 38.401 V18.3.0(2024-09) Summary of the Invention [Problem to be solved by the invention]

[0006] However, previous standards did not clearly define the behavior when combining LP-WUS and SSSG switching. For example, the restrictions on the settings for LP-WUS and SSSG switching, the behavior of both, and the behavior of terminals and LP-WUS monitoring taking SSSG switching into account were unclear. As a result, terminals may not be able to properly perform LP-WUS and SSSG switching operations. [Means for solving the problem]

[0007] A terminal in this embodiment includes a receiving unit that receives a low power wake-up signal from a base station and a control unit that sets information related to the low power wake-up signal in the terminal, and when SSSG switching is set in the terminal and a timer for PDCCH monitoring is running, the control unit determines an SCS to reference for the PDCCH monitoring based on the SCS of the low power wake-up signal or the SCS of a specific BWP of a serving cell associated with the low power wake-up signal. [Effects of the Invention]

[0008] According to this embodiment, the operation of a terminal when LP-WUS and SSSG switching coexist in a wireless communication system is clarified, and operations related to LP-WUS and SSSG switching can be appropriately performed. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram illustrating the operation of conventional SSSG switching. [Figure 3] A figure showing an example of the operation of a timer for PDCCH monitoring in a terminal in which SSSG switching is configured in this embodiment. [Figure 4]A figure showing an example of the operation of switching TCI of LP-WUS based on SSSG switching in this embodiment. [Figure 5] A figure showing an example of the operation of switching TCI of LP-WUS based on SSSG switching in this embodiment. [Figure 6] FIG. 2 is a diagram illustrating an example of a functional configuration of a base station according to the present embodiment. [Figure 7] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal according to the present embodiment. [Figure 8] FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station or a terminal according to the present embodiment. [Figure 9] 1 is a diagram illustrating an example of a configuration of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

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

[0011] The wireless communication system of this embodiment operates using existing technology. The existing technology is, for example, a wireless communication technology based on a communication standard such as the 3GPP standard. The existing technology is, for example, NR (New Radio), but is not limited to existing NR. Unless otherwise specified, the term "NR" used in this specification has a broad meaning including NR (5G) and subsequent systems (for example, 6G).

[0012] In the present embodiment described below, terms used in existing communication standards, such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel), are used. This is for convenience of description, and similar signals, functions, etc. may be called by other names.

[0013] In this embodiment, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or other methods (for example, flexible duplex, etc.).

[0014] In this embodiment, when radio parameters etc. are "configured," it may mean that a predetermined value is pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

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

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, a PSS and an SSS. The system information is, for example, transmitted via a PBCH and is also referred to as broadcast information. The synchronization signal and system information may be referred to as an SSB (SS / PBCH block). As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 in a downlink (DL) and receives control signals or data from the terminal 20 in an uplink (UL). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to the DL or UL. In addition, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0017] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal 20, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures the propagation path quality based on the reception results of the reference signals.

[0018] The terminal 20 in this embodiment may perform communication using one serving cell, or may perform communication using multiple serving cells (for example, CA or DC).

[0019] In the following description, unless otherwise specified or unless a different meaning is clear from the context, " / " means "and / or."

[0020] 3GPP is currently discussing a power consumption reduction technology called "Low-Power Wake Up Signal and Receiver." The Low-Power Wake Up Signal is called LP-WUS or WUS, and the Low-Power Wake Up Receiver is called LP-WUR, WUR, or LR. The LR, a simplified circuit that operates with lower power consumption than the Main Radio (MR), replaces the MR, a circuit used for normal data communications, and introduces a state called Ultra-Deep Sleep. The LR may have a function that triggers the MR to be powered off or powered on when it receives an LP-WUS signal.

[0021] The agreement on the scope of application of LP-WUS / WUR in 3GPP Rel-19 is shown below.

[0022] To specify a LP-WUS design that is commonly applicable to both RRC IDLE / INACTIVE and RRC CONNECTED modes, an OFDM sequence overlaid on OOK symbols (OOK-1 and / or OOK-4) based LP-WUS is specified, supporting at least LP-WUS duty cycle monitoring. The LP-WUS design must ensure that the same information is delivered in IDLE / INACTIVE operation regardless of the LP-WUS type. The OFDM sequence may carry information.

[0023] In RRC IDLE / INACTIVE mode, - Specifying the procedures and configurations for LP-WUS to indicate paging monitoring triggered by LP-WUS, including at least the configuration, subgrouping and entry / exit conditions for LP-WUS monitoring.

[0024] - For synchronization and / or serving cell RRM, the LP-WUR is assigned an LP-SS with a periodicity of Y [ms]. The LP-SS is based on OOK-1 and / or OOK-4 waveforms, with or without an OFDM sequence overlay. For LP-WURs that can receive existing PSS / SSS, the existing PSS / SSS can be used instead of the LP-SS for synchronization and RRM.

[0025] -Specify further relaxation of RRM of the terminal 20 MR with measurements of both the serving cell and the neighbor cell and offloading of RRM measurements of the terminal 20 serving cell from the MR to the LP-WUR, including the necessary conditions.

[0026] In RRC CONNECTED mode, it specifies the procedure to enable UE MR PDCCH monitoring triggered by LP-WUS, including the procedure to enable and disable LP-WUS monitoring. In CONNECTED mode, UE MR ultra-deep sleep is not considered, and UE RRM / RLM / BFD / CSI measurements are performed by MR.

[0027] The target coverage of LP-WUS and LP-SS is the PUSCH coverage of message 3. Optimization of LP-WUS signal design for idle / inactive mode takes priority over optimization for connected mode.

[0028] In Rel-16, SSSG switching was introduced to reduce UE power consumption, and in Rel-17, the SSSG switching function was extended. Figure 2 shows the operation of SSSG switching in 3GPP Rel-17. The operation of SSSG switching is specified as follows:

[0029] If the UE is provided with cellGroupsForSwitchList and one or more serving cell groups are indicated, the following procedures apply to all serving cells in each group. Otherwise, the following procedures apply only to serving cells for which the UE is provided with searchSpaceGroupIdList.

[0030] The UE is provided with a timer value by searchSpaceSwitchTimer for the serving cell for which the UE is provided with searchSpaceGroupIdList or for the serving cell set provided by cellGroupsForSwitchList, if provided. The UE decrements the timer value by one after each slot based on the reference SCS setting, which is the smallest SCS setting μ among all configured DL BWPs (Bandwidth Parts) in the serving cell or serving cell set. The UE maintains the reference SCS setting during the timer decrement procedure.

[0031] If the UE is provided with group indices of the Type3-PDCCH CSS set or USS set by searchSpaceGroupIdList-r17, and the timer value is set by searchSpaceSwitchTimer-r17 for PDCCH monitoring of an active DL BWP on the serving cell, and the timer is running, the UE shall reset the timer after the slot of the active DL BWP of the serving cell if it detects a DCI format CRC-scrambled by C-RNTI / CS-RNTI / MCS-C-RNTI / G-RNTI (for multicast) / G-CS-RNTI in the PDCCH reception. Otherwise, the UE shall decrement the timer value by 1 after the slot of the active DL BWP of the serving cell.

[0032] As shown in Figure 2, in the first slot or the first slot of a group of Xs slots after the last symbol of the PDCCH at least Pswitch symbols, the UE switches the search space set (SSS) to an SSS other than SSS#0 and sets the timer value to searchSpaceSwitchTimer. In the first slot or the first slot of a group of Xs slots after the slot where the timer expires at least Pswitch symbols, the UE switches the search space set to SSS#0.

[0033] However, previous standards did not clearly define the operation when LP-WUS and SSSG switching were combined. For example, the restrictions on the configuration of LP-WUS and SSSG switching, the operation of both and the behavior of terminals, and the operation of LP-WUS monitoring taking SSSG switching into account were unclear. As a result, terminals may not be able to properly perform LP-WUS and SSSG switching operations.

[0034] According to this embodiment, the operation of a terminal when LP-WUS and SSSG switching coexist in a wireless communication system is clarified, and appropriate operations related to LP-WUS and SSSG switching by the terminal are enabled.

[0035] In this embodiment, the LP-WUS (low power wake-up signal) is an example of a low power signal. For example, a legacy (conventional) NR signal / channel is an example of a signal that does not include a low power signal or a signal that is different from a low power signal.

[0036] The terminal 20 in this embodiment may be a terminal 20 in RRC_CONNECTED mode. However, the terminal 20 in this embodiment is not limited to a terminal 20 in RRC_CONNECTED mode. The terminal 20 in RRC_CONNECTED mode may also be referred to as a terminal 20 in a connected state.

[0037] In the following description, the notation [A / B / C / D] means at least one of A, B, C, or D, and any combination such as A and B or A, B and C is possible.

[0038] The examples in this embodiment may be implemented independently of each other, or any combination of a plurality of examples may be implemented.

[0039] In this embodiment, when "X" (for example, function or information) is configured in a terminal (or a base station), it indicates that the terminal is configured with "X".

[0040] In this embodiment, the various pieces of information set in the terminal 20 may be included in parameters (e.g., upper layer (RRC) parameters) transmitted from the base station, for example. The terminal may set the various pieces of information in the terminal based on the parameters transmitted from the base station. As another example, the various pieces of information may be set in the terminal in advance based on a standard (e.g., technical specifications of the 3GPP standard) for the terminal.

[0041] In this embodiment, "the SSSG is configured in the terminal 20" may be expressed as "the terminal 20 is configured with the SSSG (UE is configured SSSG)." "The SSSG is configured in the terminal 20" may mean that parameters for grouping search spaces and search space sets, such as searchSpaceGroupIdList, searchSpaceGroupIdList-r17, cellGroupsForSwitchList, searchSpaceSwitchTimer, and searchSpaceSwitchTimer-r17, are configured for the terminal 20, or the terminal 20 is instructed by a DCI having a "PDCCH monitoring adaptation indication" field.

[0042] In this embodiment, "SSSG switching cannot be configured in terminal 20" may mean at least one of the following: the above parameters cannot be configured in terminal 20; terminal 20 does not expect to receive DCI having a "PDCCH monitoring adaptation indication" field (terminal 20 does not receive the DCI); or terminal 20 that receives the DCI ignores the instruction for SSSG switching.

[0043] Example 1 According to the first embodiment, the settings and limitations on the coexistence of LP-WUS and SSSG switching are clarified.

[0044] In Example 1-1, when both LP-WUS and C-DRX (Connected-DRX) are configured for terminal 20 in RRC_CONNECTED mode, the configuration of SSSG switching may be restricted based on at least one of Alt.1-1 to Alt.1-5a below.

[0045] Alt.1-1: SSSG switching can be configured for terminal 20.

[0046] Alt.1-1a: SSSG switching cannot be configured for terminal 20.

[0047] Alt.1-2: SSSG switching can be configured for at least one of any cell of the terminal 20, PCell (Primary Cell), PSCell (Primary Secondary Cell), SCell (Secondary Cell) or SpCell (Special Cell).

[0048] Alt.1-2a: SSSG switching cannot be configured for at least one of any cell, PCell, PSCell, SCell or SpCell of the terminal 20.

[0049] Alt.1-3: SSSG switching can be configured for the cell from which the terminal 20 receives the LP-WUS.

[0050] Alt.1-3a: SSSG switching cannot be configured for the cell from which the terminal 20 receives the LP-WUS.

[0051] Alt.1-4: SSSG switching can be configured for cells associated with a cell group and for which the cell group is configured with LP-WUS operation of option 1 or option 2 described below.

[0052] In the LP-WUS CONNECTED mode in option 1, (1-1) if there is no wake-up instruction from the LP-WUS to the terminal 20 during the set drx-onDurationTimer (i.e., during the DRX state), the terminal 20 does not transmit a CSI / L1-RSRP report, or (1-2) even if there is a wake-up instruction from the LP-WUS to the terminal 20, the terminal 20 transmits a CSI / L1-RSRP report according to the setting during the drx-onDurationTimer. In option 1, outside the period of the drx-onDurationTimer, i.e., during the C-DRX active period, the CSI / L1-RSRP report is transmitted according to the conventional specifications.

[0053] In the LP-WUS CONNECTED mode in option 2, (2-1) if there is no wake-up instruction from the LP-WUS to the terminal 20, the terminal 20 does not transmit a CSI / L1-RSRP report, or (2-2) if there is a wake-up instruction from the LP-WUS to the terminal 20, the terminal 20 transmits a CSI / L1-RSRP report according to the setting. In option 2, the setting of drx-onDurationTimer does not affect the operation of the CSI / L1-RSRP report.

[0054] Alt.1-4a: SSSG switching cannot be configured for cells associated with a cell group and for which the cell group is configured for LP-WUS operation of option 1 or option 2.

[0055] Alt.1-5: The terminal 20 can operate SSSG switching simultaneously with LP-WUS.

[0056] Alt.1-5a: Terminal 20 cannot operate SSSG switching simultaneously with LP-WUS.

[0057] In Example 1-2, when only LP-WUS is configured in the terminal 20 in connection mode and C-DRX is not configured, the configuration of SSSG switching may be restricted based on at least one of Alt.2-1 to Alt.2-6a below.

[0058] Alt.2-1: SSSG switching can be configured for terminal 20.

[0059] Alt.2-1a: SSSG switching cannot be configured for terminal 20.

[0060] Alt. 2-2: SSSG switching can be configured for at least one of any cell of the terminal 20, PCell, PSCell, SCell or SpCell.

[0061] Alt. 2-2a: SSSG switching cannot be configured for at least one of any cell, PCell, PSCell, SCell, or SpCell of the terminal 20.

[0062] Alt.2-3: SSSG switching can be configured for the cell in which the terminal 20 receives the LP-WUS.

[0063] Alt.2-3a: SSSG switching cannot be configured for the cell from which the terminal 20 receives the LP-WUS.

[0064] Alt. 2-4: SSSG switching can be configured for at least one of the cells associated with or not associated with the LP-WUS of the terminal 20.

[0065] Alt. 2-4a: SSSG switching can be configured for at least one of the cells associated with or not associated with the LP-WUS of the terminal 20.

[0066] Alt. 2-5: SSSG switching can be configured for at least one of the cells associated with or not associated with the LP-WUS operation of Option 1 or Option 2 above.

[0067] Alt. 2-5a: SSSG switching can be configured for at least one of the cells associated with or not associated with the LP-WUS operation of Option 1 or Option 2 above.

[0068] Alt.2-6: The terminal 20 can operate SSSG switching simultaneously with LP-WUS.

[0069] Alt.2-6a: Terminal 20 cannot operate SSSG switching simultaneously with LP-WUS.

[0070] As described above, according to the first embodiment, it is possible to clarify the restrictions on the settings of LP-WUS and SSSG switching, and thus, even when LP-WUS and SSSG switching coexist, the terminal can appropriately perform operations related to LP-WUS and SSSG switching.

[0071] Example 2 Example 2 clarifies the operation in LP-WUS and SSSG switching.

[0072] According to Example 2-1, when SSSG switching is configured for the terminal 20 and a timer for PDCCH monitoring is running in the terminal 20, the operation of the terminal 20 to refer to an SCS for determining a slot and a symbol may be one or more of Alt.1-1 to Alt.1-3 below. The SCS referred to by the terminal 20 may be referred to as a reference SCS.

[0073] Alt.1-1: (When the SCS is set in the LP-WUS) The terminal 20 refers to the SCS of the LP-WUS.

[0074] Alt.1-2: The terminal 20 refers to at least one of the active BWPs (bandwidth portions) of the serving cell associated with the LP-WUS, the BWP with the smallest BWP ID, or the SCS of the BWP with the smallest SCS setting μ among the configured BWPs.

[0075] Alt. 1-3: The terminal 20 refers to the SCS of the BWP with the smallest SCS setting μ among at least one of the active or configured BWPs among all serving cells associated with the LP-WUS.

[0076] According to Example 2-2, when SSSG switching is configured for terminal 20 and a timer for PDCCH monitoring is running in terminal 20, one or more of the following Alt. 2-1 to Alt. 2-5a may be applied to decrementing the timer.

[0077] Alt.2-1: The terminal 20 decrements the timer value by 1 after the slot of the active DL BWP of the serving cell.

[0078] Alt. 2-2: The terminal 20 decrements the timer value after the slot on the reference SCS by 1. For example, the referenced SCS may be determined based on Alt. 1-1 / 1-2 / 1-3 in Example 2-1 above.

[0079] Alt.2-3: When the terminal 20 is not monitoring the LP-WUS, when the terminal 20 is monitoring the PDCCH, or after the LP-WUS for PDCCH monitoring is triggered for the terminal 20, the terminal 20 may decrement the timer value by 1. In the example of Fig. 3, when the terminal 20 is monitoring the PDCCH or after the LP-WUS for PDCCH monitoring is triggered for the terminal 20, the timer is decremented.

[0080] Alt.2-4: When the terminal 20 is monitoring LP-WUS or when it stops PDCCH monitoring for the LP-WUS procedure, the terminal 20 may suspend decrementing the timer. Thereafter, when the terminal 20 is monitoring the PDCCH or after LP-WUS for PDCCH monitoring is triggered for the terminal 20, the terminal 20 may resume decrementing the timer. In the example of Fig. 3, when the terminal 20 stops PDCCH monitoring for the LP-WUS procedure, the decrementing of the timer is suspended.

[0081] Alt.2-5: When the terminal 20 is monitoring the LP-WUS, the terminal 20 may decrement the timer value by one.

[0082] Alt.2-5a: When the terminal 20 is not monitoring the LP-WUS, the terminal 20 may decrement the timer value by one.

[0083] The above Alt.2-1 to Alt.2-5a may be applied, for example, when the TCI (Transmission Configuration Indication) of the LP-WUS is associated with a search space as in the third embodiment described later.

[0084] In Example 2-3, when SSSG switching is configured for the terminal 20 and a timer for PDCCH monitoring is running in the terminal 20, the terminal 20 assumes one or more of the following when the timer expires.

[0085] Alt.3-1: When the terminal 20 transitions to LP-WUS monitoring or stops PDCCH monitoring due to the LP-WUS procedure, if the timer is running, the terminal 20 terminates the timer. For example, the terminal 20 may assume that the timer has expired. For example, when the terminal 20 resumes to monitor the PDCCH (for example, by an LP-WUS trigger or by falling back to legacy without an LP-WUS trigger), the terminal 20 may monitor according to the search space set of group index 0.

[0086] As described above, according to the second embodiment, it is possible to clarify the operations of LP-WUS and SSSG switching and the behavior of a terminal when LP-WUS and SSSG switching coexist, thereby enabling the terminal to appropriately perform operations related to LP-WUS and SSSG switching even when LP-WUS and SSSG switching coexist.

[0087] Example 3 According to the third embodiment, the LP-WUS monitoring operation taking into account SSSG switching is clarified.

[0088] According to Example 3, if the TCI of the LP-WUS is associated with the CORESET (Control Resource Set) of the search space of the search space group, when an SSSG switch occurs, the TCI of the LP-WUS may also be switched accordingly.

[0089] The relationship between SSSG switching and the TCI of the LP-WUS in Example 3 will be described. Regardless of whether the TCI of the LP-WUS is associated with a CORESET (of a search space), when the terminal 20 switches the SSSG due to an SSSG switching instruction, expiration of the timer set by searchSpaceSwitchTimer (timer expiry), or other SSSG switching event, the terminal 20 may assume the TCI of the LP-WUS based on at least one of Alt.1-1 and Alt.1-2 below.

[0090] Alt.1-1: The TCI of the LP-WUS is not switched or changed by SSSG switching, i.e., the switching / changing of the TCI of the LP-WUS may be performed independently of the SSSG switching.

[0091] Alt.1-2: The TCI of the LP-WUS is switched or changed by SSSG switching.

[0092] For example, the terminal 20 assumes that after SSSG switching, the TCI of the LP-WUS follows the TCI of the CORESET with the smallest CORESET ID associated with the search spaces of the search space set group. That is, after SSSG switching, the TCI of the LP-WUS may be switched to the TCI of the CORESET with the smallest CORESET ID associated with the search spaces of the search space set group.

[0093] For example, the terminal 20 assumes that after SSSG switching, the TCI of the LP-WUS follows the TCI of the CORESET of the search space with the smallest search space ID in the search space set group. That is, after SSSG switching, the TCI of the LP-WUS may be switched to the TCI of the CORESET of the search space with the smallest search space ID in the search space set group.

[0094] The switching time of the TCI of the LP-WUS in Example 3 will be described. When the TCI of the LP-WUS is associated with a CORESET (of a search space) and the terminal 20 switches the SSSG due to an SSSG switching instruction, expiration of the timer set by searchSpaceSwitchTimer, or other SSSG switching event, the terminal 20 may apply the TCI of the switched LP-WUS in at least one of the following cases: Alt. 2-1 or Alt. 2-2.

[0095] Alt.2-1: When the terminal 20 applies an instruction to monitor the PDCCH according to a search space set having an indicated group index, the terminal 20 may apply the switched TCI of the LP-WUS.

[0096] Alt.2-2: At the beginning of a "time position" at least "P" symbols after the "last symbol of PDCCH reception that provides an indication of SSSG switching" or the "slot after the timer searchSpaceSwitchTimer expires", the terminal 20 may apply the TCI of the switched LP-WUS. The "time position" may be, for example, any of Alt.2-2-1 to Alt.2-2-4 below.

[0097] Alt.2-2-1: The time position may be the first slot. The SCS may be defined as 15 * 2^μ kHz. Alt.2-2-1 may be applied to the SCS when μ∈{0,1,2,3}, for example.

[0098] Alt.2-2-2: The time position may be the first slot of a slot group of X slots. Alt.2-2-2 may be applied to the SCS when μ∈{4,5,}, for example.

[0099] Alternative 2-2-3: The time position may be the LP-WUS opportunity. For example, as shown in Figure 4, the TCI is switched in the LP-WUS opportunity after "P" symbols (P=1) after the timer expires. That is, the TCI is switched in the middle of the LP-WUS period.

[0100] Alternative 2-2-4: The time position may be the first LP-WUS opportunity of the LP-WUS period. For example, as shown in Figure 5, after the timer expires, the TCI is switched at the first LP-WUS opportunity of the LP-WUS period after the "P" symbol. In other words, the TCI is not switched in the middle of the LP-WUS period.

[0101] For example, the terminal 20 may assume that the TCI of the LP-WUS is not switched / changed in the middle of the LP-WUS period of the LP-WUS cycle. The terminal 20 may assume that the switching of the TCI of the LP-WUS occurs before or after the LP-WUS period.

[0102] The value of the symbol "P" above may be a legacy value or a newly defined value based on the capabilities of the terminal 20.

[0103] In the third embodiment, the terminal 20 may assume that the TCI switching of the LP-WUS and the SSSG switching are applied simultaneously. As another example, the terminal 20 may assume that the TCI switching of the LP-WUS and the SSSG switching are applied at different times.

[0104] As described above, according to the third embodiment, it is possible to clarify the operation of LP-WUS monitoring taking SSSG switching into consideration. As a result, even when LP-WUS and SSSG switching coexist, the terminal can appropriately perform operations related to LP-WUS and SSSG switching.

[0105] According to the above-described embodiment, by allowing LP-WUS and SSSG switching to coexist efficiently, it is possible to improve the utilization efficiency of radio resources and achieve power saving in terminals.

[0106] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions of the embodiments.

[0107] <Base station> Fig. 6 is a diagram showing an example of the functional configuration of the base station 10 in this embodiment. As shown in Fig. 6, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 6 is merely an example. The functional divisions and names of the functional units may be any names as long as they can perform the operations according to this embodiment.

[0108] The transmitter 110 includes a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The transmitter 110 also transmits to the terminal 20 setting information, instructions, notifications, etc. related to a low-power wake-up signal. The transmitter 110 also transmits to the terminal 20 a notification related to switching of monitoring operation. The receiver 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of higher layers from the received signals. The transmitter 110 also has a function of transmitting PSS, SSS, PBCH, DL / UL control signals, etc. to the terminal 20. The receiver 120 also receives inter-network node messages from other network nodes.

[0109] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information is, for example, information related to measurements of low-power signals.

[0110] As described in the embodiments, the control unit 140 controls settings, instructions, and notifications related to low-power wake-up signals, etc. A functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

[0111] <Device> Fig. 7 is a diagram showing an example of the functional configuration of the terminal 20 in this embodiment. As shown in Fig. 7, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 7 is merely an example. As long as the operations according to this embodiment can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0112] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The transmitter 210 also transmits capability information related to the low-power wake-up signal to the base station 10. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The receiver 220 also has a function of receiving PSS, SSS, PBCH, DL / UL / SL control signals, and the like transmitted from the base station 10. The receiver 220 also receives paging notification information and configuration information, instructions, and notifications related to the low-power wake-up signal from the base station 10. For example, the receiver 220 receives the low-power wake-up signal from the base station 10. The configuration unit 230 stores various configuration information received by the receiver 220 from the base station 10. The configuration unit 230 also stores pre-configured configuration information. The configuration information includes, for example, information related to measurements of the low-power signal.

[0113] As described in the embodiments, the control unit 240 controls the settings, instructions, and notifications related to the low-power wake-up signal. The function unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the function unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0114] (Hardware configuration) The block diagrams (FIGS. 6 and 7) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0115] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0116] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 8 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0117] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0118] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0119] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0120] The processor 1001 loads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the loaded program. The program may be a program that causes a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 6 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 7 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0121] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0122] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0123] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0124] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0125] The processor 1001, the storage device 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between the devices.

[0126] The base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0127] Fig. 9 shows an example configuration of a vehicle 2001. As shown in Fig. 9, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0128] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0129] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0130] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a front or rear wheel rotation speed signal obtained by a rotation speed sensor 2022, a front or rear wheel air pressure signal obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0131] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information acquired from external devices via the communication module 2013 or the like to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001. The information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that output information to the outside.

[0132] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as a millimeter-wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0133] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0134] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0135] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0136] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0137] (Configuration of this embodiment) (Additional note 1) a receiving unit that receives a low-power wake-up signal from a base station; a control unit that sets information about the low power wake-up signal in the terminal; When SSSG switching is configured in the terminal and a timer for PDCCH monitoring is running, the control unit determines the SCS to reference for the PDCCH monitoring based on the SCS of the low power wake-up signal or the SCS of a specific BWP of a serving cell associated with the low power wake-up signal.

[0138] (Additional note 2) The control unit decrements the timer after a slot of an active downlink BWP of a serving cell, after a slot on the referenced SCS, during monitoring of the low power wake-up signal or after an LP-WUS trigger for the PDCCH monitoring; The terminal according to Supplementary claim 1, wherein the control unit suspends decrementing the timer when the PDCCH monitoring is stopped.

[0139] (Additional note 3) The terminal according to claim 1, wherein the control unit switches the TCI of the low power wake-up signal based on the execution of the SSSG switching when the TCI of the low power wake-up signal is associated with the CORESET of the SSSG.

[0140] (Additional note 4) The terminal described in Supplementary Claim 3, wherein when the SSSG switching is performed based on the SSSG switching instruction or the expiration of a search space switch timer, the control unit applies the TCI of the switched low power wake-up signal after a predetermined number of symbols have elapsed after the last symbol of PDCCH reception that provides the SSSG switching instruction or after the slot in which the timer set by the search space switch timer expires.

[0141] (Additional note 5) The terminal according to claim 1, wherein when C-DRX (Connected Discontinuous Reception) is set in the terminal, the control unit does not set the SSSG switching for a cell that receives the low power wake-up signal.

[0142] (Additional note 6) A communication method performed by a terminal, comprising: receiving a low power wake-up signal from a base station; setting information about the low power wake-up signal in the terminal; and when SSSG switching is configured in the terminal and a timer for PDCCH monitoring is running, determining an SCS to reference for the PDCCH monitoring based on the SCS of the wake-up signal for low power or the SCS of a specific BWP of a serving cell associated with the wake-up signal for low power.

[0143] Any of the above configurations clarifies the operation of a terminal when LP-WUS and SSSG switching coexist in a wireless communication system, and enables the terminal to appropriately perform operations related to LP-WUS and SSSG switching.

[0144] (Supplementary explanation of the embodiment) Although the present embodiment has been described above, the disclosed invention is not limited to such an embodiment, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; matters described in two or more items may be used in combination as needed, and matters described in one item may apply to matters described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to this embodiment and the software operated by the processor of the terminal 20 according to this embodiment may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0145] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0146] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other appropriate system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may also be applied.

[0147] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0148] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0149] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0150] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0151] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0152] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0153] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0154] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0155] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0156] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0157] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0158] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0159] In the present disclosure, terms such as "base station (BS)," "radio base station," "base station device," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0160] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0161] In the present disclosure, the base station transmitting information to the terminal 20 may be interpreted as the base station instructing the terminal 20 to control and operate based on the information.

[0162] In this disclosure, the terms "Mobile Station (MS)," "user terminal 20," "User Equipment (UE)," "terminal 20," etc. may be used interchangeably.

[0163] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal 20, mobile terminal 20, wireless terminal 20, remote terminal 20, handset, user agent, mobile client, client, or some other suitable terminology.

[0164] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be a mobile object that moves autonomously based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0165] Furthermore, a base station in the present disclosure may be read as a user terminal 20. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal 20 is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals 20 (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0166] Similarly, the user terminal 20 in the present disclosure may be read as a base station. In this case, the base station may be configured to have the functions of the user terminal 20 described above.

[0167] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0168] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0169] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0170] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0171] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0172] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0173] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0174] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0175] Numerology may be communication parameters applied to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0176] A slot may be configured of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0177] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0178] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0179] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0180] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0181] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0182] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0183] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0184] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0185] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0186] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0187] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0188] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0189] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within the BWP.

[0190] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0191] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0192] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0193] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0194] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0195] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0196] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0197] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 Terminal 20 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device 2001 Vehicle 2002 Drive unit 2003 Steering section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. a receiving unit that receives a low-power wake-up signal from a base station; a control unit that sets information about the low power wake-up signal in the terminal; When SSSG (Search Space Set Group) switching is configured in the terminal and a timer for PDCCH (Physical Downlink Control Channel) monitoring is running, the control unit determines an SCS to reference for the PDCCH monitoring based on an SCS (Subcarrier Spacing) of the low power wake-up signal or an SCS of a specific BWP (Bandwidth Part) of a serving cell associated with the low power wake-up signal.

2. The control unit decrements the timer after a slot of an active downlink BWP of a serving cell, after a slot on the referenced SCS, during monitoring of the low power wake-up signal or after an LP-WUS trigger for the PDCCH monitoring; The terminal according to claim 1 , wherein the control unit stops decrementing the timer when the PDCCH monitoring is stopped.

3. The terminal according to claim 1, wherein the control unit switches the TCI (Transmission Configuration Indication) of the low power wake-up signal based on the execution of the SSSG switching when the TCI (Transmission Configuration Indication) of the low power wake-up signal is associated with the CORESET (Control Resource Set) of the SSSG.

4. 4. The terminal according to claim 3, wherein when the SSSG switching is performed based on the instruction for SSSG switching or expiration of a search space switch timer, the control unit applies the TCI of the switched low power wake-up signal after a predetermined number of symbols have elapsed after the last symbol of a PDCCH reception that provides the instruction for SSSG switching or after a slot in which a timer based on the search space switch timer expires.

5. The terminal according to claim 1 , wherein when C-DRX (Connected Discontinuous Reception) is set in the terminal, the control unit does not set the SSSG switching for a cell that receives the low power wake-up signal.

6. A communication method performed by a terminal, comprising: receiving a low power wake-up signal from a base station; setting information about the low power wake-up signal in the terminal; determining an SCS to be referenced for PDCCH monitoring based on an SCS (Subcarrier Spacing) of the low power wake-up signal or an SCS of a specific BWP (Bandwidth Part) of a serving cell associated with the low power wake-up signal when SSSG (Search Space Set Group) switching is configured in the terminal and a timer for PDCCH (Physical Downlink Control Channel) monitoring is running.

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