Terminal and communication method

Abstract

This terminal comprises: a reception unit that receives, from a base station, a signal including information indicating activation or deactivation of monitoring of a low-power synchronization signal and a low-power wake up signal; and a control unit that activates or deactivates the monitoring on the basis of the signal. The control unit activates or deactivates a low-power wireless receiver on the basis of the results of measurement of the low-power synchronization signal and the low-power wake up signal by the monitoring.

Description

Terminal and communication method

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

[0002] 3GPP (registered trademark) (3rd Generation Partnership Project) is currently studying a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless communication method will be referred to as "NR") in order to achieve a larger system capacity, a higher data transmission speed, and a lower latency in wireless sections. In 5G, various wireless technologies and network architectures are being studied to meet the requirements of achieving a throughput of 10 Gbps or more while reducing the latency in wireless sections to 1 ms or less (for example, Non-Patent Document 1 and Non-Patent Document 2).

[0003] In order to further reduce the power consumption of conventional wake-up signals (WUS (Wake Up Signal)), 3GPP Rel-19 is considering the introduction of an ultra-low power wake-up signal (LP (Low Power)-WUS) with ultra-low power consumption, and technology to switch between a receiving circuit (module) called LP-WUR (Wake Up Receiver) (also known as LR (Low power Radio)) and MR (Main Radio).

[0004] 3GPP TS 38.300 V18.0.0(2023-12)3GPP TS 38.401 V18.0.0(2023-12)3GPP TS 38.304 V18.0.0(2023-12)

[0005] However, the conventional standards do not clearly define the procedures for activating or deactivating LP-WUR and MR, so there is a risk that LP-WUR and MR may not be activated or deactivated properly.

[0006] The present invention has been made in view of the above points, and has an object to define a procedure for measurements on low-power received low-power signals in a wireless communication system.

[0007] The terminal in this embodiment comprises a receiving unit that receives a signal from a base station including information instructing activation or deactivation of monitoring of a low-power synchronization signal and a low-power wake-up signal, and a control unit that activates or deactivates the monitoring based on the signal, and the control unit activates or deactivates a low-power radio receiver based on the results of measuring the low-power synchronization signal and the low-power wake-up signal through the monitoring.

[0008] According to the disclosed technology, it is possible to define the procedure for activation or deactivation of LP-WUR and MR in a wireless communication system.

[0009] 1-1-1-2。 FIG. 1-1-1-2 is a diagram for explaining a wireless communication system in the present embodiment. FIG. 1-1-1 is a diagram for illustrating an example of a procedure for radio resource management (RRM) using low power radio in the present embodiment. FIG. 1-1-1 is a diagram for illustrating an example of a procedure for LR and MR activation in the present embodiment. FIG. 1-1-1 is a sequence diagram for illustrating an example of a procedure for triggering activation of LP-SS / LP-WUS monitoring in Example 1-1-1. FIG. 1-1-1-2 is a diagram for illustrating an example of information indicating activation of LP-SS / LP-WUS monitoring in a DCI field in Example 1-1-1-2. FIG. 1-1-1-2 is a diagram for illustrating an example of an updated short message indicator field of DCI in Example 1-1-1-2. FIG. 1-1-1-2 is a sequence diagram for illustrating an example of a procedure for triggering activation of LP-SS / LP-WUS monitoring in Example 1-1-2. FIG. 1-1-3 is a flowchart for illustrating an example of a procedure for performing activation of LP-SS / LP-WUS monitoring in Example 1-1-3. FIG. 1-1-3 is a flowchart for illustrating an example of an operation of a terminal based on reception of an instruction for activation / deactivation of LP-SS / LP-WUS monitoring in Example 1-2. FIG. 1 is a flowchart showing an example of the operation of a terminal based on reception of an instruction for activation / deactivation of an MR in Example 2-1-1. FIG. 2 is a diagram showing an example of the functional configuration of a base station in this embodiment. FIG. 3 is a diagram showing an example of the functional configuration of a terminal in this embodiment. FIG. 4 is a diagram showing an example of the hardware configuration of a base station or a terminal in this embodiment. FIG. 5 is a diagram showing an example of the configuration of a vehicle in this embodiment.

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

[0012] In addition, in the present embodiment described below, terms 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) used in existing LTE are used. This is for convenience of description, and similar signals, functions, etc. may be called by other names. The above-mentioned terms in NR are referred to as SS, PSS, SSS, PBCH, PRACH, etc. without any particular distinction from LTE.

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

[0014] Furthermore, in this embodiment, "configuring" radio parameters etc. may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] Fig. 1 is a diagram showing an example of the configuration of a wireless communication system according to this embodiment. As shown in Fig. 1, the wireless communication system according to 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. 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 resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal may be, for example, a PSS or an SSS. The system information is transmitted, for example, via the PBCH and is also referred to as broadcast information. The synchronization signal and system information may also 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 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, 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 propagation path quality based on the reception results of the reference signals.

[0018] In the following description, unless otherwise specified or unless a different meaning is clear from the context, " / " means "and / or."

[0019] In 3GPP (registered trademark), a power consumption reduction technology called "Low-Power Wake Up Signal and Receiver" is being discussed. 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. A state called Ultra-Deep Sleep is introduced by operating the LR, a simplified circuit that operates with lower power consumption than the Main Radio (MR), which is a circuit used for normal data communication. The LR may have a function that triggers the power OFF of the MR or the power ON of the MR when the LR receives an LP-WUS signal.

[0020] 3GPP Rel-19 also considers the following: For example, it specifies a Low Power-Synchronization Signal (LP-SS) with a specific period corresponding to LP-WUR for serving cell synchronization and / or Radio Resource Management (RRM) in idle mode / inactive mode. LP-SS is a signal based on an On Off Keying (OOK) waveform with or without an overlaid Orthogonal Frequency Division Multiplexing (OFDM) sequence. It also specifies further RRM relaxation in the MR of a terminal for both serving cell measurements and neighbor cell measurements, and serving cell RRM measurements, including necessary conditions, for a terminal offloaded from the MR to the LP-WUR.

[0021] The purpose of the RRM procedures in idle / inactive mode is to ensure that the terminal is camped on the best cell.

[0022] In serving cell measurement (see Non-Patent Document 3), the terminal measures the SS-RSRP and SS-RSRQ levels of the serving cell and evaluates the cell selection criteria of the serving cell at least once every M1 × N1 DRX cycles, where M1 = 2 if the SMTC period (TSMTC) > 20 ms and the DRX cycle ≤ 0.64 s, and M1 = 1 otherwise. Also, N1 = 1 in FR1, and N1 = 3 to 12 in FR2.

[0023] Neighbor cell measurements (intra- or inter-frequency cell reselection, see 3GPP TS 36.210, section 5.2.4) need only be performed if the serving cell is not strong enough, i.e., if one of the following is not met: Intra-frequency cell reselection criterion: Srxlev>S IntraSearchP and Squal>S IntraSearchQ Inter-frequency cell reselection criteria: Srxlev>S nonIntraSearchP and Squal>S nonIntraSearchQ

[0024] If the terminal is configured with DRX_IDLE / eDRX_IDLE cycles and the terminal evaluates that the serving cell does not satisfy the cell selection criterion in Nserv consecutive DRX / eDRX cycles, the terminal starts measuring all neighboring cells indicated by the serving cell, regardless of the measurement rule that currently restricts the measurement activity. Here, the cell selection criterion S is Srxlev>0 and Squal>0 (see Section 5.2.3.2 of Non-Patent Document 3). Here, Srxlev and Squal are calculated as follows: Srxlev=Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Q offsettemp ・Squal=Q qualmeas -(Q qualmin +Q qualminoffset )-Qoffset temp

[0025] FIG. 2 is a diagram illustrating a radio resource management (RRM) procedure using low-power radio in this embodiment. In (A) of FIG. 2, a terminal is present in cell #1 and performs serving cell measurements. Here, the low-power radio (LR) is in a sleep state, and the main radio (MR) receiver performs serving cell measurements. From this state, activation of the LR for serving cell measurements transitions to a state in which the LR performs serving cell measurements and the main radio does not perform measurements or performs relaxed measurements. In (B) of FIG. 2, while the terminal is moving from cell #1 to cell #2, the main radio is activated for both serving cell measurements and neighboring cells. In (C) of FIG. 2, the terminal performs cell reselection and is present in cell #2, and the LR is activated.

[0026] 3 is a diagram showing an example of an activation procedure of the LR and the MR in this embodiment. The terminal 20 (UE) in this embodiment has an MR and an LR (LP-WUR). The MR is a receiver (receive (Rx) module or circuit) that operates with lower power consumption than the LR.

[0027] In State 1 on the left side of Fig. 3, the MR measures the serving cell and the LR is in sleep mode. Then, as Trigger 1, the LR is activated based on the serving cell measurement result, and in State 2, the LR measures the serving cell and the MR goes to sleep. In the following Example 1, a method for activating the LR (LP-WUR) corresponding to Trigger 1 in Fig. 3 will be described. Before the activation of the LR (LP-WUR), LP-SS (Synchronization Signal) / LP-WUS monitoring may be performed.

[0028] In the center diagram of Fig. 3, Trigger 2 indicates that the MR and LR transition to State 1 based on measurement results of the serving cell and neighboring cells. In the right diagram of Fig. 3, Trigger 1 indicates that the MR and LR transition to State 2. In the following Example 2, a method for activating the MR corresponding to Trigger 2 in Fig. 3 is described.

[0029] In this embodiment, Example 1 and Example 2 may be executed independently, or may be executed in combination with Example 1 and Example 2. Furthermore, each example included in Example 1 and Example 2 may be executed independently, or any examples may be executed in combination.

[0030] (Example 1) According to Example 1, the procedure for activation / deactivation of LP-SS / LP-WUS monitoring is clarified. Activation of LP-WUR may be performed based on the measurement results of LP-SS / LP-WUS by LP-SS / LP-WUS monitoring. LP-SS / LP-WUS in this embodiment may refer to at least one signal of LP-SS or LP-WUS.

[0031] (Embodiment 1-1) Embodiment 1-1: The conditions for triggering activation / deactivation of LP-SS / LP-WUS monitoring may follow one or more of the following embodiments.

[0032] (Example 1-1-1) According to Example 1-1-1, activation / deactivation of LP-SS / LP-WUS monitoring may be indicated by downlink control information (DCI). As shown in FIG. 4, in step S101, the base station 10 transmits DCI to the terminal 20. The DCI includes an indication of activation / deactivation of LP-SS / LP-WUS monitoring. In step S102, the terminal 20 performs activation / deactivation of P-SS / LP-WUS monitoring based on the received DCI.

[0033] The terminal 20 may receive DCI at the following opportunities (e.g., time resources):

[0034] Alt.1-1: The terminal 20 may receive DCI at paging occasions (POs) / paging early indication occasions (PEI-Os). The POs / PEI-Os that receive DCI may be all or part of the POs / PEI-Os. The POs / PEI-Os that receive DCI may be configured by at least one of system information, RRC (Radio Resource Control), MAC CE (Medium Access Control Element), or DCI transmitted by the base station 10.

[0035] Alt. 1-2: The terminal 20 may receive DCI on newly defined occasions, for example, low power occasions (LPOs). The LPO configuration may be provided by at least one of system information, RRC, and DCI transmitted from the base station 10.

[0036] The LPO setting may be common to all terminals 20, common to a group of terminals 20, or different for each terminal 20. The group of terminals 20 may be determined based on a terminal ID (UE ID), the number of groups set, and / or the number of terminals included in the group.

[0037] An LPO is a set of PDCCH monitoring occasions (MOs) and may consist of multiple time slots (e.g., subframes or OFDM symbols) in which an indication of "LP-SS / LP-WUS monitoring activation" can be transmitted.

[0038] In multi-beam operation, the terminal 20 may assume that the same DCI and the content indicated by the DCI are repeated in all transmit beams, and the selection of the beam for receiving the DCI may be based on the implementation of the terminal 20.

[0039] Alt. 1-3: The terminal 20 may receive DCI and control the channel search space on other cell-specific or terminal (UE)-specific occasions.

[0040] Example 1-1-1-2: The DCI may include information on activation / deactivation of LP-SS / LP-WUS monitoring according to the following DCI design.

[0041] The DCI may be scrambled by a legacy Radio Network Temporary Identifier (RNTI) (e.g., P-RNTI / SI-RNTI / PEI-RNTI) or a newly defined RNTI (e.g., LP-RNTI). The newly defined RNTI may be common to all terminals 20, or may be common to a group including multiple terminals 20.

[0042] The DCI may use an existing DCI format or a new DCI format.

[0043] Alt. 2-1: Information about activation / deactivation of LP-SS / LP-WUS monitoring may be indicated by an existing field in an existing DCI format. For example, as shown in Fig. 5A, this information may be indicated by the existing "Short Message" field of DCI format 1_0 scrambled by the P-RNTI. As shown in the upper table (legacy) of Fig. 5A, the first four bits (i.e., bits 1-4) of the 8-bit field of the existing "Short Message" field are already used. As shown in the lower table of Fig. 5A, one or more bits of the last four bits (i.e., bits 5-8) of the existing "Short Message" field may be reused to define a new message for activation / deactivation of LP-SS / LP-WUS monitoring, such as "lpwurActivationDeactivation." As a definition of "lpwurActivationDeactivation", as shown in the example of FIG. 5A, if LP-WUR monitoring is not configured in the terminal 20 or if the terminal 20 does not have the LP-WUR monitoring function, the terminal 20 must ignore the field; otherwise, "0" may indicate that LP-SS / LP-WUS monitoring is disabled, and "1" may indicate that LP-SS / LP-WUS monitoring is activated.

[0044] Alt.2-2: LP-SS / LP-WUS monitoring activation / deactivation information may be indicated by a new field (e.g., “lpwurActivationDeactivation”) in an existing DCI format (e.g., DCI format 1_0 scrambled by the P-RNTI). The size of the new field “lpwurActivationDeactivation” may be fixed or may be set to an arbitrary size. The definition of the new field “lpwurActivationDeactivation” may be the same as the definition of “lpwurActivationDeactivation” shown in the example of Fig. 5A.

[0045] Whether the new field is present in the DCI may be indicated by a newly defined RRC configuration (e.g., lpwurConfig). The terminal 20 may determine whether the new field is present in the DCI based on information indicated in the newly defined RRC configuration.

[0046] As shown in FIG. 5B, the "Short Message Indicator" field may be updated to indicate under what conditions the field indicating LP-SS / LP-WUS monitoring activation / deactivation information exists.

[0047] As in the example of FIG. 5B, bit field “01” may indicate “Only scheduling information for Paging, and TRS availability indication if trs-ResourceSetConfig is configured, and activation / deactivation of LP-SS / LP-WUS monitoring if lpwurConfig is configured, are present in the DCI.”

[0048] A bit field of "10" may indicate "Only short message, and TRS availability indication if trs-ResourceSetConfig is configured, and activation / deactivation of LP-SS / LP-WUS monitoring if lpwurConfig is configured, are present in the DCI."

[0049] A bit field of "11" may indicate "Both scheduling information for Paging, TRS availability indication if trs-ResourceSetConfig is configured, and activation / deactivation of LP-SS / LP-WUS monitoring if lpwurConfig is configured, and short messages are present in the DCI."

[0050] Alt.2-3: LP-SS / LP-WUS monitoring activation / deactivation information may be indicated by a new DCI format (e.g., DCI format 2_x).

[0051] The new DCI format may be used to indicate activation / deactivation of LP-SS / LP-WUS monitoring for a specific terminal 20 or a group including multiple terminals 20.

[0052] Each of the terminals 20 may refer to the LP-SS / LP-WUS monitoring activation / deactivation field to indicate a group of terminals 20. The location of the field for a particular terminal 20 may be indicated by RRC.

[0053] (Example 1-1-2) Activation / deactivation of LP-SS / LP-WUS monitoring may be indicated by MAC CE and / or RRC signaling. As shown in Fig. 6, in step S111, the base station 10 transmits MAC CE / RRC signaling to the terminal 20. In step S112, the terminal 20 performs activation / deactivation of P-SS / LP-WUS monitoring based on the received DCI.

[0054] When an instruction to activate / deactivate LP-SS / LP-WUS monitoring is indicated by RRC signaling, the instruction may be included in existing RRC signaling (e.g., RRCRelease signaling) or new RRC signaling, or may be transmitted together with existing or new RRC signaling.

[0055] If an instruction for activation / deactivation of LP-SS / LP-WUS monitoring is indicated by a MAC CE, the instruction may be included in or transmitted together with an existing or new MAC CE.

[0056] (Example 1-1-3) Activation of LP-SS / LP-WUS monitoring may be performed based on a criterion according to a measurement result, a period during which the criterion is satisfied, and / or a measurement time. The criterion may be predefined or may be set based on a signal (e.g., higher layer signaling). For example, the terminal 20 may determine to activate LP-SS / LP-WUS monitoring when the measurement result (e.g., measResult) is equal to or greater than a threshold (e.g., Qthreshold) in N consecutive measurements.

[0057] FIG. 7 is a flowchart showing an example of a procedure for the terminal 20 in Example 1-1-3 to perform activation of LP-SS / LP-WUS monitoring.

[0058] In step S121, the terminal 20 performs measurements in the serving cell.

[0059] In step S122, the terminal 20 determines whether the measurement result satisfies a predetermined criterion. For example, as shown in the following formula 1, if the measurement result (measResult) is equal to or greater than a threshold (Qthreshold), the terminal 20 may determine that the predetermined criterion is satisfied. Furthermore, in addition to formula 1, if the number of measurements is equal to or greater than a predetermined number, the terminal 20 may determine that the predetermined criterion is satisfied. For example, when N measurements are performed, the measurement result may be the total value of the N measurements, the average value, or the minimum value (or maximum value) of the N measurements, and the threshold may be set to a value corresponding to the method for calculating the measurement result.

[0060] measResult >= Qthreshold (Formula 1)

[0061] When determining whether the measurement result satisfies a predetermined criterion (for example, Equation 1), one or more of the following 1-A) to 1-E) may be applied.

[0062] 1-A) measResult may be, for example, any one or a combination of CSI measurement results set by reportConfig, RRM measurement results measured in RRC_CONNECTED mode, or RRM measurement results measured in RRC_IDLE or RRC_IDLE mode.

[0063] 1-B) measResult may be any one or a combination of CQI, cri-RSRP, ssb-Index-RSRP, cri-SINR, or ssb-Index-SINR.

[0064] 1-C) measResult may be L1 / L3 measurement beam or cell quantity of SINR, RSRP or RSRQ by MR.

[0065] 1-D) measResult may be, for example, L1 / L3 measurement beam or cell quantity of LPSS-RSRP, LPSS-RSRQ, LPSS-RSSI or LPSS-SINR.

[0066] 1-E) The Qthreshold and the N number of measurements may be set according to one or more of the following 1-E-1) to 1-E-5).

[0067] 1-E-1) Metrics measured by LP-WUR or MR; 1-E-2) Metrics measured with low-power signals (LP-SS, LP-WUS, etc.); 1-E-3) Whether the measured metrics take into account the power of LP-WUS or SSB; 1-E-4) Whether the measured metrics take into account the power of the overlaid OFDM sequence; 1-E-5) Frequency band

[0068] The predetermined criteria may include multiple equations, such as Equation 1. Different metrics and thresholds may be set for measResult and Qthreshold for each of the multiple equations. The criteria may be determined to be met only if all of the multiple equations are met.

[0069] In step S122 of FIG. 7, if the measurement result satisfies a predetermined criterion (Yes in step S122), the terminal 20 performs activation of LP-SS / LP-WUS monitoring in step S123.

[0070] On the other hand, if the measurement result does not satisfy the predetermined criteria in step S122 (No in step S122), the terminal 20 does not execute activation of LP-SS / LP-WUS monitoring in step S124.

[0071] (Embodiment 1-1-4) The time when the terminal 20 starts LP-SS / LP-WUS monitoring or when the MR is switched to sleep mode can be one or more of the following.

[0072] When the terminal 20 receives the instruction, the terminal 20 may start LP-SS / LP-WUS monitoring immediately, X periods after receiving the instruction, immediately after the terminal 20 switches to RRC_IDLE mode, or X periods after the terminal 20 enters RRC_IDLE mode.

[0073] When the terminal 20 receives the instruction, the terminal 20 may switch the MR to sleep mode immediately, Y periods after receiving the instruction / immediately after the terminal 20 switches to RRC_IDLE mode, Y periods after the terminal 20 enters RRC_IDLE mode, or Y periods after the start of LP-SS / LP-WUS monitoring or Y periods after the start of LP-SS / LP-WUS monitoring.

[0074] The above X / Y period may be in units of milliseconds, seconds, symbols, slots, subframes, radio frames or DRX cycles of LP-WUR.

[0075] (Example 1-1-5) The activation / deactivation instruction for LP-SS / LP-WUS monitoring in the above-described Examples 1-1-1 to 1-1-3 may include one or more pieces of information from 2-A) to 2-D) below.

[0076] 2-A) Activation / deactivation of LP-SS / LP-WUS monitoring 2-B) Time when the terminal 20 starts LP-SS / LP-WUS monitoring or switches the MR to sleep mode in Example 1-1-4 2-C) Mode and details when the MR turns on (e.g., different levels of sleep mode (ultra-deep / deep / light / micro sleep modes) and information about waking up for measurement or monitoring) 2-D) Mode and details when the LP-WUR turns on in Example 1-3

[0077] (Example 1-2) A terminal procedure of an MR based on reception of an instruction to activate / deactivate LP-SS / LP-WUS monitoring will be described. As shown in Fig. 8, when the terminal 20 receives an instruction to activate LP-SS / LP-WUS monitoring in step S131, the terminal 20 switches the MR to a sleep mode in step S132. The MR of the terminal 20 has multiple sleep modes with different power consumption and transition times, and the terminal 20 may switch the MR to one of the sleep modes in accordance with an instruction or setting.

[0078] In RRC_IDLE mode, when the MR goes into sleep mode or when LP-SS / LP-WUS monitoring is activated, the MR may occasionally wake up to perform one or more of the following operations 3-A) to 3-D) according to the configuration or instructions.

[0079] 3-A) Performing serving cell measurements, intra-frequency measurements, and / or inter-frequency measurements; 3-B) Not performing serving cell measurements, intra-frequency measurements, and / or inter-frequency measurements; 3-C) Performing PO monitoring, PEI-O monitoring, and / or MBS monitoring; 3-D) Not performing PO monitoring, PEI-O monitoring, and / or MBS monitoring.

[0080] (Example 1-3) A terminal procedure of LP-WUR based on receiving an instruction to activate / deactivate LP-SS / LP-WUS monitoring will be described. When the terminal 20 receives an instruction to activate LP-SS / LP-WUS monitoring, the terminal 20 may wake up the LP-WUR and perform one or more of the following steps 4-A) to 4-C).

[0081] 4-A) Synchronization with LP-SS / LP-WUS 4-B) Cell measurement by LP-WUR 4-C) LP-WUS monitoring

[0082] In the RRC_IDLE mode, when the MR of the terminal 20 performs wake-up, paging monitoring, and / or reference signal measurement, the terminal 20 may pause, stop, or continue the measurement of the LP-SS / LP-WUS by the LP-WUR, or may perform an operation based on an instruction from the base station 20. When the terminal 20 resumes the measurement after pausing or stopping the measurement, it may be determined that the previous measurement results are usable.

[0083] In this way, the terminal 20 in the first embodiment may receive a signal (e.g., DCI or MAC CE) including information instructing activation or deactivation of monitoring of the LP-SS / LP-WUS from the base station 10, and may activate or deactivate the LP-SS / LP-WUS based on the signal. The terminal 20 may also activate or deactivate the LP-WUR based on the measurement results of the LP-SS / LP-WUS.

[0084] In this way, the terminal 20 in the first embodiment may receive a reference signal (e.g., CSI) from the base station 10, measure the received reference signal or perform radio resource management (RRM) measurement, and monitor activation or deactivation of LP-SS / LP-WUS monitoring based on the reference signal measurement result or the radio resource management measurement result. The terminal 20 may activate or deactivate LP-WUR based on the LP-SS / LP-WUS measurement result obtained by LP-SS / LP-WUS monitoring.

[0085] According to the above configuration, the procedure for activating or deactivating LP-SS / LP-WUS monitoring is clarified, and the LP-WUR can be appropriately activated or deactivated.

[0086] In the above-described first embodiment, a procedure for activating or deactivating LP-SS / LP-WUS monitoring has been described. However, the activation or deactivation of LP-SS / LP-WUS monitoring may be replaced with the activation or deactivation of LP-WUR. For example, the terminal 20 may receive a signal (e.g., DCI or MAC CE) including information instructing the activation or deactivation of LP-WUR monitoring from the base station 10, and activate or deactivate the LP-WUR based on the signal. For example, the terminal 20 may receive a reference signal (e.g., CSI) from the base station 10, measure the received reference signal or perform radio resource management (RRM) measurement, and activate or deactivate the LP-WUR based on the reference signal measurement result or the radio resource management measurement result.

[0087] (Example 2) The activation procedure of MR will be explained.

[0088] (Example 2-1) Triggering of activation of MR may be performed as follows.

[0089] (Example 2-1-1) As shown in Fig. 9, in step S201, it is determined whether the measurement result of the low-power signal and / or one or more of the following predetermined criteria (5-A)-5-F) are satisfied, and if it is determined that the predetermined condition is satisfied (Yes in step S201), activation of the MR may be executed in step S202. On the other hand, if it is determined that the predetermined condition is satisfied (No in step S201), activation of the MR is not executed in step S203.

[0090] 5-A) The cell selection criterion S_LP is not satisfied for L consecutive periods or L measurement times.

[0091] 5-B) The intra-frequency cell reselection criteria is not met for N consecutive durations or N measurement times.

[0092] 5-C) The inter-frequency cell reselection criteria is not met for M consecutive periods or M measurements.

[0093] 5-D) The criteria of Example 1-1-3 above (eg, Equation 1) are not met for O consecutive durations or O measurement times.

[0094] 5-E) The measurement result (measResult) is less than the threshold value, as shown in Equation 2. For example, Equation 2 is satisfied for P consecutive durations or measurement times.

[0095] measResult < Qthreshold2 (Formula 2)

[0096] measResult may follow the definition of measResult in Equation 1. Qthreshold2 may follow the definition of Qthreshold in Equation 1. Qthreshold2 may be smaller or larger than Qthreshold.

[0097] 5-F) The LP-WUR fails to achieve synchronization with the LP-SS for Q periods or Q LP-SS transmission opportunities.

[0098] The same or different integer values ​​may be specified for L / M / N / O / P above. If L / M / N / O / P is a duration, it may be in units of milliseconds, seconds, symbols, slots, subframes, radio frames, or DRX cycles of LP-WUR.

[0099] (Embodiment 2-1-2) MR is activated when receiving LP-WUS of the terminal 20 together with one or more of the following conditions:

[0100] From the received LP-WUS, the bits carried by the OOK waveform and / or the overlaid OFDM sequence are detected.

[0101] The MR may be activated when the UE ID or UE Group ID detected from the LP-WUS is the same as the UE ID set according to a predefined rule and the UE Group ID to which the terminal 20 belongs.

[0102] (Embodiment 2-2) When the MR is activated as in embodiment 2-1-1 or 2-1-2, the terminal 20 may turn on the MR immediately or X period after activation.

[0103] The above X period may be in units of milliseconds, seconds, symbols, slots, subframes, radio frames or DRX cycles of LP-WUR.

[0104] When the MR is activated, the MR may occasionally wake up to perform one or more of the following actions 6-A) to 6-D) according to pre-settings or instructions.

[0105] 6-A) Performing serving cell measurements, intra-frequency measurements, and / or inter-frequency measurements; 6-B) Not performing serving cell measurements, intra-frequency measurements, and / or inter-frequency measurements; 6-C) Performing PO monitoring, PEI-O monitoring, and / or MBS monitoring; 6-D) Not performing PO monitoring, PEI-O monitoring, and / or MBS monitoring.

[0106] (Example 2-3) A terminal procedure for LP-WUR will be described. When MR is activated, the terminal 20 immediately switches the LP-WUR to sleep mode or does not monitor low power signals after Y period after MR is activated, while MR is operating, or Y period after MR is operating.

[0107] The above Y period may be in units of milliseconds, seconds, symbols, slots, subframes, radio frames or DRX cycles of LP-WUR.

[0108] In this way, the terminal 20 in the second embodiment may receive a low-power signal from the base station 10, measure the low-power signal using a low-power wireless receiver, and activate the MR based on the measurement result of the low-power signal.

[0109] According to the second embodiment, the procedure for activating or deactivating MR is clarified, and it is possible to appropriately switch from LP-WUR to MR.

[0110] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described above will be described. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions of the embodiments.

[0111] <Base Station 10> Fig. 10 is a diagram showing an example of the functional configuration of the base station 10 in this embodiment. As shown in Fig. 10, 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. 10 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations according to this embodiment.

[0112] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The transmitter 110 also transmits setting information, instructions, notifications, etc. related to a low-power wake-up signal to the terminal 20. The transmitter 110 also transmits notifications related to switching of monitoring operations to the terminal. The receiver 120 has 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.

[0113] 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.

[0114] 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.

[0115] <Terminal 20> Fig. 11 is a diagram showing an example of the functional configuration of the terminal 20 in this embodiment. As shown in Fig. 11, 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. 11 is merely an example. As long as the operations according to this embodiment can be executed, 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.

[0116] 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 wirelessly receives various signals 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 a low-power wake-up signal from the base station 10. The configuration unit 230 stores various configuration information received from the base station 10 by the receiver 220. 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.

[0117] As described in the embodiments, the control unit 240 controls settings, instructions, and notifications related to the low-power wake-up signal. A functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0118] (Hardware Configuration) The block diagrams (FIGS. 10 and 11) 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 directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0119] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, 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.

[0120] 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. 12 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.

[0121] In the following description, the term "apparatus" can be interpreted 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.

[0122] Each function in the base station 10 and the terminal 20 is realized by loading specified 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.

[0123] 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.

[0124] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 10 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 11 may be implemented by a control program stored in the storage device 1002 and running on 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 also be transmitted from a network via a telecommunications line.

[0125] 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 read-only memory (EPROM), an electrically erasable programmable read-only memory (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.

[0126] 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 (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0127] 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, a communication module, etc. 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.

[0128] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0129] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0130] Furthermore, 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.

[0131] Fig. 13 shows an example configuration of a vehicle 2001. As shown in Fig. 13, 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.

[0132] 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.

[0133] 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).

[0134] 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.

[0135] 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.

[0136] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] <Configuration of this embodiment> (Item 1) A terminal comprising: a receiving unit that receives, from a base station, a signal including information instructing activation or deactivation of monitoring of a low-power synchronization signal and a low-power wake-up signal; and a control unit that activates or deactivates the monitoring based on the signal, wherein the control unit activates or deactivates a low-power wireless receiver based on a result of measuring the low-power synchronization signal and the low-power wake-up signal through the monitoring. (Item 2) The terminal described in item 1, wherein the control unit measures the low-power signals using the low-power wireless receiver, and activates a primary wireless receiver based on the result of the measurement of the low-power signals. (Clause 3) A terminal comprising: a receiving unit that receives a reference signal from a base station; and a control unit that measures the reference signal or measures radio resource management, wherein the control unit monitors activation or deactivation of monitoring of a low power synchronization signal and a low power wake-up signal based on a result of the measurement of the reference signal or a result of the measurement of the radio resource management, and activates or deactivates a low power radio receiver based on a result of the measurement of the low power synchronization signal and the low power wake-up signal by the monitoring. (Clause 4) The terminal according to clause 3, wherein the control unit measures the low power signal with the low power radio receiver, and activates a primary radio receiver based on a result of the measurement of the low power signal. (Clause 5) A terminal comprising: a receiving unit that receives a low power signal from a base station; and a control unit that measures the low power signal with the low power radio receiver, wherein the control unit activates the primary radio receiver based on a result of the measurement of the low power signal.(Clause 6) A communication method executed by a terminal, comprising: a step of receiving from a base station a signal including information instructing activation or deactivation of monitoring of a low-power synchronization signal and a low-power wake-up signal; a step of activating or deactivating the monitoring based on the signal; and a step of activating or deactivating a low-power radio receiver based on the results of measuring the low-power synchronization signal and the low-power wake-up signal by the monitoring.

[0142] Any of the above configurations can specify the procedure for activating or deactivating a receiver that processes low-power signals and a receiver that processes normal signals. The configurations of paragraphs 1, 3, and 6 clarify the procedure for activating or deactivating monitoring of low-power synchronization signals and low-power wake-up signals, allowing the low-power radio receiver to be activated or deactivated appropriately. The configurations of paragraphs 2, 4, and 5 clarify the procedure for activating or deactivating the primary radio receiver, allowing appropriate switching from the low-power radio receiver to the primary radio receiver.

[0143] (Supplementary Notes on the Embodiments) Although the present embodiment has been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; 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 (as long as there is no contradiction). Boundaries between functional units or processing units in functional block diagrams do not necessarily correspond to 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 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, but such devices may be realized by 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, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0144] 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) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling and Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB) and 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.

[0145] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems enhanced based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0146] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged 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.

[0147] In this specification, a specific operation described as being performed by the base station 10 may 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).

[0148] The information, signals, etc. 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.

[0149] 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 transmitted to another device.

[0150] In the present disclosure, the determination may be made by a value represented by one bit (0 or 1), by a Boolean value (true or false), or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0151] 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.

[0152] 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.

[0153] 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.

[0154] Note that terms described 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.

[0155] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0156] 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.

[0157] 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.

[0158] 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. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0159] 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 partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage.

[0160] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0161] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0162] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0163] 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.

[0164] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0165] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0166] 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.

[0167] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0168] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0169] 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."

[0170] 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.

[0171] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0172] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0173] 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.

[0174] Numerology may be communication parameters that apply to the transmission and / or 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, specific windowing operations performed by the transceiver in the time domain, etc.

[0175] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0176] 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.

[0177] 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.

[0178] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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 greater than or equal to 1 ms.

[0184] A resource block (RB) is a resource allocation unit in the time domain and the 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 the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0185] 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.

[0186] 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, etc.

[0187] 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.

[0188] 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 BWP and numbered within the BWP.

[0189] 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.

[0190] 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."

[0191] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to 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.

[0192] 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.

[0193] 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."

[0194] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0195] 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.

[0196] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheels 2008 Rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 Tire 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 system section 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. A terminal comprising: a receiving unit that receives a signal from a base station including information instructing activation or deactivation of monitoring of a low-power synchronization signal and a low-power wake-up signal; and a control unit that activates or deactivates the monitoring based on the signal, wherein the control unit activates or deactivates a low-power radio receiver based on the results of measuring the low-power synchronization signal and the low-power wake-up signal through the monitoring.

2. The terminal according to claim 1, wherein the control unit: measures a low-power signal by the low-power radio receiver; and activates a primary radio receiver based on the result of the measurement of the low-power signal.

3. A terminal comprising: a receiving unit that receives a reference signal from a base station; and a control unit that measures the reference signal or performs radio resource management measurements, wherein the control unit monitors activation or deactivation of monitoring of a low-power synchronization signal and a low-power wake-up signal based on the results of the measurement of the reference signal or the results of the measurement of the radio resource management, and activates or deactivates a low-power radio receiver based on the results of the measurement of the low-power synchronization signal and the low-power wake-up signal by said monitoring.

4. The terminal according to claim 3, wherein the control unit: measures a low-power signal by the low-power radio receiver; and activates a primary radio receiver based on the result of the measurement of the low-power signal.

5. A terminal comprising: a receiving unit that receives a low-power signal from a base station; and a control unit that measures the low-power signal using a low-power radio receiver, wherein the control unit activates a primary radio receiver based on the results of the measurement of the low-power signal.

6. A communication method executed by a terminal, comprising the steps of: receiving from a base station a signal including information instructing activation or deactivation of monitoring of a low-power synchronization signal and a low-power wake-up signal; activating or deactivating the monitoring based on the signal; and activating or deactivating a low-power radio receiver based on the results of measuring the low-power synchronization signal and the low-power wake-up signal by the monitoring.

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