Terminal and base station

Abstract

This terminal comprises: a reception unit that receives a synchronization signal, a low-power synchronization signal, and a low-power wake-up signal; and a control unit that calculates, on the basis of a low-power synchronization signal reference signal reception power and a low-power synchronization signal reference signal reception quality measured using at least one of the synchronization signal, the low-power synchronization signal, and the low-power wake-up signal, a low-power reception level reference and a low-power reception quality reference that are used for cell selection reference in the serving cell measurement. The control unit uses an offset set on the basis of at least one of a measurement value measured by a low-power receiver or a main wireless receiver and a measurement value calculated on the basis of the low-power synchronization signal or the low-power wake-up signal in the calculation of the low-power reception level reference and the low-power reception quality reference.

Description

Terminals and base stations

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

[0002] The 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] 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)

[0004] In 3GPP Rel-19, an ultra-low power consumption system called LP (Low Power)-WUS / WUR (Wake Up Receiver) is being considered with the aim of further reducing the power consumption of conventional WUS (Wake Up Signal).

[0005] 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 signals in a wireless communication system.

[0006] According to the disclosed technology, there is provided a terminal having a receiving unit that receives a synchronization signal, a low-power synchronization signal, and a low-power wake-up signal, and a control unit that calculates a low-power reception level standard and a low-power reception quality standard to be used as cell selection standards in serving cell measurements, based on a low-power synchronization signal reference signal reception power and a low-power synchronization signal reference signal reception quality measured using at least one of the synchronization signal, the low-power synchronization signal, and the low-power wake-up signal, wherein the control unit uses an offset in calculating the low-power reception level standard and the low-power reception quality standard, which is set based on at least one of a measurement value measured in a low-power receiver or a primary radio receiver and a measurement value calculated based on the low-power synchronization signal or the low-power wake-up signal.

[0007] According to the disclosed technology, it is possible to define procedures for measurements on low-power signals in a wireless communication system.

[0008] FIG. 1 is a diagram for explaining a wireless communication system in an embodiment of the present invention. FIG. 2 is a diagram for explaining a wireless communication system in an embodiment of the present invention. FIG. 3 is a diagram for explaining a procedure for radio resource management (RRM) using low-power radio in an embodiment of the present invention. FIG. 4 is a diagram showing an example of settings related to measurement timing in an embodiment of the present invention. FIG. 5 is a diagram showing an example of the functional configuration of a base station 10 in an embodiment of the present invention. FIG. 6 is a diagram showing an example of the functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 7 is a diagram showing an example of the hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention. FIG. 8 is a diagram showing an example of the configuration of a vehicle 2001 in an embodiment of the present invention.

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0010] In the operation of the wireless communication system according to the embodiment of the present invention, 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 subsequent to LTE-Advanced (e.g., NR), unless otherwise specified.

[0011] In addition, in the embodiments of the present invention 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.

[0012] Furthermore, in the embodiment of the present invention, 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.).

[0013] Furthermore, in the embodiments of the present invention, "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.

[0014] Fig. 1 is a diagram showing an example of the configuration of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0015] 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).

[0016] 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.

[0017] Fig. 2 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. Fig. 2 shows an example of the configuration of a wireless communication system in which DC (Dual Connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as a Master Node (MN) and a base station 10B serving as a Secondary Node (SN) are provided. The base station 10A and the base station 10B are each connected to a core network. A terminal 20 can communicate with both the base station 10A and the base station 10B.

[0018] The cell group provided by the base station 10A, which is an MN, is called an MCG (Master Cell Group), and the cell group provided by the base station 10B, which is an SN, is called an SCG (Secondary Cell Group). In addition, in DC, the MCG is composed of one PCell and one or more SCells, and the SCG is composed of one PSCell (Primary SCG Cell) and one or more SCells.

[0019] The processing operations in this embodiment may be executed in the system configuration shown in Fig. 1, in the system configuration shown in Fig. 2, or in other system configurations. In the following description, " / " means "and / or" unless otherwise specified or unless it is clear from the context that a different meaning exists.

[0020] In 3GPP (registered trademark), a power consumption reduction technology called "Low-Power Wake Up Signal and Receiver" is under discussion. The Low-Power Wake Up Signal is called LP-WUS or simply 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 simple circuit that operates with lower power consumption than the Main Radio (MR) used in normal data communications, as a replacement for the MR. The LR may have a function that triggers the power-off of the MR or the power-on of the MR when it receives an LP-WUS signal.

[0021] 3GPP Rel-19 also considers the following: For example, it specifies a Low Power-Synchronization Signal (LP-SS) with a specific period corresponding to the LP-WUR for serving cell synchronization and / or Radio Resource Management (RRM) in idle mode / inactive mode. The 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 necessary conditions for further RRM relaxation in the MR of a terminal for both serving cell measurements and neighbor cell measurements, and serving cell RRM measurements of a terminal offloaded from the MR to the LP-WUR.

[0022] The purpose of the RRM procedures in idle / inactive mode is to ensure that the terminal is camped on the best cell.

[0023] 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 T SMTC If FR1 is greater than 20 ms and the DRX cycle is less than or equal to 0.64 seconds, then M1=2, otherwise M1=1. Also, N1=1 for FR1 and N1=3-12 for FR2.

[0024] 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

[0025] Also, if the terminal is configured with a DRX_IDLE / eDRX_IDLE cycle 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

[0026] (Example) An example will be described below. In order for a terminal having an LR to receive a low power signal in RRC_IDLE / INACTIVE mode, the following points need to be considered.

[0027] In detecting and synchronizing with the LP-SS / LP-WUS, initial synchronization with the SSB should be achieved by the MR, and fine synchronization with the LP-SS should be achieved by LP-SS / LP-WUS detection.

[0028] For serving cell measurements on low-power signals, including LP-SS, LP-WUS, and other signals that LP-WUR can detect, consideration must be given to measurement metrics, measurement timing configuration, measurement criterion, and calculation and procedures for cell and beam measurements.

[0029] In addition, with regard to relaxed measurements of the main radio (Main Radio) in both serving cell measurements and neighbor cell measurements, it is necessary to consider the conditions for relaxed serving cell and neighbor cell measurements and the impact on legacy behavior of the main radio (Main Radio).

[0030] In addition, regarding the measurement state transition between the low-power radio (LP-WUR) and the main radio (Main Radio), it is necessary to consider the trigger criteria and the behavior of the terminal in both the low-power radio (LP-WUR) and the main radio (Main Radio).

[0031] FIG. 3 is a diagram illustrating a radio resource management (RRM) procedure using low-power radio according to an embodiment of the present invention. In FIG. 3(A), a terminal is located in cell #1 and performs serving cell measurements. Here, the low-power radio receiver (LR) is in a sleep state, and the main radio receiver (Main Radio) performs serving cell measurements. From this state, by enabling the LR for serving cell measurements, the terminal transitions to a state in which the LR performs serving cell measurements and the Main Radio performs no measurements or relaxed measurements. In FIG. 3(B), while the terminal is moving from cell #1 to cell #2, the Main Radio is enabled for both serving cell measurements and neighbor cell measurements. In FIG. 3(C), the terminal performs cell reselection and is located in cell #2, and the LR is enabled.

[0032] (Method 1) Measurement Metric and Measurement Timing Configuration (Method 1-1) LPSS-RSRP The base station 10 and the terminal 20 may perform measurement of Low Power Synchronization Signal (LPSS)-Received Signal Received Power (RSRP) using at least one of the following methods, where LPSS-RSRP is defined as the linear average of the power contributions (in watts) of resource elements carrying LP-SS.

[0033] When the LP-SS is configured with an overlaid Orthogonal Frequency Division Multiplexing (OFDM) sequence on an On-Off Keying (OOK) symbol, the base station 10 and the terminal 20 may or may not count the power of the overlaid OFDM sequence for determining the LPSS-RSRP, i.e., may or may not include the power of the sequence in the LPSS-RSRP.

[0034] The base station 10 and the terminal 20 may use the LP-WUS and / or SSB in addition to the LP-SS for determining the LPSS-RSRP.

[0035] The base station 10 and terminal 20 may measure LPSS-RSRP using LP-WUS and / or SSB by linear averaging the power contributions of resource elements carrying corresponding reference signals, taking into account the power scaling of the reference signals.

[0036] When the LP-WUS consists of an overlaid OFDM sequence on an OOK symbol, the base station 10 and the terminal 20 may or may not count the power of the overlaid OFDM sequence for LPSS-RSRP determination.

[0037] The terminal 20 may report, for example, in an L1 / L3 measurement report, which signaling contributes to the measured LPSS-RSRP.

[0038] The base station 10 and the terminal 20 may limit the measurement time resource for LPSS-RSRP to within the duration of a Low Power Synchronization Signal Measurement Time Configuration (LPSS-MTC) window.

[0039] For the definition of LPSS-MTC, please refer to methods 1-4 below.

[0040] The base station 10 and the terminal 20 may measure LPSS-RSRP only between at least one of the following signals that have the same physical layer cell identification information (e.g., identifier) ​​or the same value used for cell identification (e.g., cell identifier): LP-SS corresponding to the same LP-SS index (LP-SS index indicates the index assigned to the LP-SS. The same applies to the indexes for the other signals below); LP-WUS corresponding to the same LP-WUS index when the LP-WUS is used for LPSS-RSRP determination; SSB corresponding to the same SSB (SS / PBCH block) index when the SSB is used for LPSS-RSRP determination; and spatially corresponding signals such as LP-SS, LP-WUS, and SSB with the same SSB index. For example, signals such as LP-SS and LP-WUS having one of the beam patterns received by the terminal 20 using a spatial domain receive filter and / or spatial receive parameters when receiving the corresponding SSB.

[0041] When the upper layer indicates a specific LP-SS for performing LPSS-RSRP measurements, the base station 10 and the terminal 20 may measure the LPSS-RSRP corresponding to only the indicated LP-SS.

[0042] The base station 10 and the terminal 20 may measure the LPSS-RSRP in at least one of an idle (RRC_IDLE), an inactive (RRC_INACTIVE), and a connected (RRC_CONNECTED) mode.

[0043] The base station 10 and the terminal 20 may measure the LPSS-RSRP in at least one of the serving cell, the intra-frequency cell, and the inter-frequency cell.

[0044] The base station 10 and the terminal 20 may measure the LPSS-RSRP in at least one of a low power wake-up signal (LP-WUR) receiver and a main radio receiver.

[0045] The terminal 20 may report at least one of the following to the base station 10 as terminal capabilities, or the base station 10 may set it. - Whether LPSS-RSRP can be measured by a low power wake-up signal (LP-WUR) and / or a main radio (Main Radio) - Whether LP-WUS and / or SSB can be used for SS-RSRP and / or LPSS-RSRP determination - Whether the power of the overlaid OFDM sequence can be used for SS-RSRP and / or LPSS-RSRP determination - Whether the power of the overlaid OFDM sequence from LP-SS and / or LP-WUS can be used for SS-RSRP and / or LPSS-RSRP determination (Method 1-2) LPSS-RSRQ and LPSS-RSSI The base station 10 and the terminal 20 may measure the low power synchronization signal reference signal received quality (LPSS-Received Signal Received Quality (RSRQ)) and the low power synchronization signal received signal strength (LPSS-Received Signal Strength Indicator (RSSI)) using at least one of the following methods. Here, LPSS-RSRQ is defined as the ratio of N×LPSS-RSRP to LPSS-RSSI (N×LPSS-RSRP / LPSS-RSSI), where N is the number of resource blocks in the LPSS-RSSI measurement bandwidth. If the resource blocks for LPSS-RSSI and LPSS-RSRP measurements are the same, LPSS-RSRQ may be defined as LPSS-RSRP / LPSS-RSSI.

[0046] Measurements of the numerator and denominator values ​​in the above ratios may be performed on the same set of resource blocks in the same or different radio environments, e.g., both in LP-WUR or one in LP-WUR and the other in Main Radio.

[0047] The LPSS-RSSI may consist of the total received power (in watts) observed from the LP-WUR and / or Main Radio over N resource blocks in the measurement bandwidth, only in specific OFDM symbols of the measurement time resource, from all sources including co-channel serving and non-serving cells, adjacent channel interference, and thermal noise.

[0048] When the LPSS-RSSI measurement is performed by LP-WUR, the base station 10 and the terminal 20 may limit the measurement time resource for the NR carrier RSSI to within the LPSS-MTC or LP-RMTC (Low Power - RSSI MTC, low power RSSI measurement time setting) window. Here, for the definition of LP-RMTC, see Methods 1 to 4 described below.

[0049] When the higher layer indicates a specific LP-SS for performing LPSS-RSRQ measurements, the base station 10 and the terminal 20 may measure the LPSS-RSRQ corresponding to only the indicated LP-SS.

[0050] The base station 10 and the terminal 20 may measure the LPSS-RSRQ in at least one of the modes RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED.

[0051] The base station 10 and the terminal 20 may measure the LPSS-RSRQ in at least one of the serving cell, the intra-frequency cell, and the inter-frequency cell.

[0052] The base station 10 and the terminal 20 may measure the LPSS-RSRQ in at least one of the LP-WUR and the Main Radio.

[0053] Whether or not LPSS-RSRQ and / or LPSS-RSSI can be measured by LP-WUR and / or Main Radio may be reported by the terminal 20 to the base station 10 as a terminal capability, or may be set by the base station 10.

[0054] (Methods 1-3) LPSS-SINR The base station 10 and the terminal 20 may perform Low Power Synchronization (LPSS)-Signal to Noise Ratio (SINR) measurements using at least one of the following methods. Here, LPSS-SINR may be defined as the linear average of the power contributions (unit: [Watt]) of resource elements carrying LP-SS signals divided by the linear average of the noise and interference power contributions (unit: [W]).

[0055] When the LP-SS consists of an overlaid OFDM sequence on an OOK symbol, the base station 10 and the terminal 20 may or may not count the power of the overlaid OFDM sequence for determining the LPSS-SINR, i.e., may or may not include the power of this sequence in the LPSS-SINR.

[0056] The base station 10 and the terminal 20 may measure the signal, interference, and noise via resource elements carrying LP-SS in the same radio environment, for example, both LP-WUR, or one LP-WUR and the other Main Radio, via resource elements carrying LP-SS within the same frequency bandwidth.

[0057] The base station 10 and the terminal 20 may limit the measurement time resource for LPSS-SINR to within the duration of the LPSS-MTC window.

[0058] The base station 10 and the terminal 20 may use the LP-WUS and / or SSB in addition to the LP-SS to determine the LPSS-SINR.

[0059] When the LP-WUS consists of an overlaid OFDM sequence on an OOK symbol, the base station 10 and the terminal 20 may or may not count the power of the overlaid OFDM sequence for determining the LPSS-SINR.

[0060] When the higher layer indicates a specific LP-SS for performing LPSS-SINR measurements, the base station 10 and the terminal 20 may measure the LPSS-SINR corresponding to only the indicated LP-SS.

[0061] The base station 10 and the terminal 20 may measure the LPSS-SINR in at least one of the modes RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED.

[0062] The base station 10 and the terminal 20 may measure the LPSS-SINR in at least one of the serving cell, the intra-frequency cell, and the inter-frequency cell.

[0063] The base station 10 and the terminal 20 may measure the LPSS-RSRQ in at least one of the LP-WUR and the Main Radio.

[0064] Whether or not LPSS-SINR can be measured by LP-WUR and / or Main Radio may be reported by the terminal 20 to the base station 10 as a terminal capability, or may be set by the base station 10 .

[0065] (Method 1-4) Measurement time configuration The base station 10 and terminal 20 may use the following settings and / or operations as measurement timing configuration for LP-WUR-based measurements and / or measurements on low-power signals.

[0066] The low power synchronization signal measurement time setting (LPSS-MTC) and / or the low power RSSI measurement time setting (LP-RMTC) may include at least one of the following measurement-related setting information: Periodicity: The measurement period, in units of radio frame, subframe, ms (millisecond), DRX cycle, etc. Offset: Information indicating the measurement start point, in units the same as the period, and possible values ​​between 0 and the period value. Duration: The measurement time length, in units of radio frame, subframe, ms, etc. Other information, such as a list of LPSSs to be measured. Figure 4 is a diagram showing an example of settings related to measurement timing in an embodiment of the present invention. As shown in Fig. 4, for example, the candidate periods and offsets for LPSS-MTC are {40 ms, 80 ms, 160 ms, 320 ms, 640 ms, 1280 ms}, and the candidate durations are {1 ms, 2 ms, 4 ms, 6 ms, 8 ms, 10 ms}. Also, LPSS-MTC and LP-RMTC may have different parameters and candidate values ​​for each parameter. For example, the measurement timing settings for LPSS-MTC include parameters related to the periodicity, offset, duration, and list of LPSSs, while the measurement timing settings for LP-RMTC include only parameters related to the periodicity and offset.

[0067] The terminal 20 may transmit a request to the base station 10 regarding parameters in the measurement timing settings.

[0068] In addition, the values ​​of some of the parameters may be adjusted based on a request from the terminal 20 .

[0069] The request of the terminal 20 may also be transmitted via a measurement report on the PUCCH, PUSCH, L1 or L3.

[0070] Furthermore, after receiving a request from the terminal 20, the base station 10 may execute the update of the requested parameters.

[0071] The base station 10 and the terminal 20 may perform at least one of the following measurement timing-related settings (for example, LPSS-MTC, LP-RMTC, etc.).

[0072] Alt. 1: The terminal 20 may configure the LPSS-MTC and / or LP-RMTC for LP-WUR-based measurements and / or low-power signal measurements based on the periodicity and offset parameters received from the base station 10. For example, for the LPSS-MTC and / or LP-RMTC measurement occasion, the terminal 20 configures the first symbol to satisfy the condition "SFN mod T = (FLOOR(Offset / 10)), where T = CEIL(Periodicity / 10)" and the subframe to satisfy the condition "Subframe = Offset mod 10."

[0073] Alt. 2: When configuration is performed based on two measurement timing configurations (e.g., mtc1 and mtc2), the terminal 20 may configure the LPSS-MTC and / or LP-RMTC for LP-WUR-based measurements and / or low-power signal measurements according to some of the reception parameters in one measurement timing configuration (e.g., mtc2) and may configure them using some parameters from the other measurement timing configuration (e.g., mtc1). Here, it may be assumed that the first symbol and subframe of each LPSS-MTC and / or LP-RMTC measurement occasion satisfy the conditions set forth in Alt. 1. For example, if mtc1 is configured with all parameters, such as period, offset, and duration, and mtc2 is configured with only parameters related to period, the terminal 20 may perform configuration by referring to the period from mtc2 and the parameters related to offset and duration from mtc1.

[0074] (Method 2) Serving cell measurement by LP-WUR The procedure for measuring the serving cell for the low power wake-up signal (LP-WUS) will be described.

[0075] (Method 2-1) Measurement Criterion The following describes the criterion for measuring the serving cell for the low power wake-up signal (LP-WUS).

[0076] (Method 2-1-1) The base station 10 and the terminal 20 may consider at least one of the following for the cell selection criterion S_LP for LP-WUR and for measuring low-power signals. Furthermore, the LP or lp attached to the variables indicates that it relates to a low-power signal. - Metrics of the reception level (LPSS-RSRP) and / or quality value (LPSS-RSRQ) - Offset related to waveform information of the received low-power signal For example, the cell selection criterion S_LP is satisfied when Srxlev_lp (low-power reception level criterion) > 0 and Squal_lp (low-power reception quality criterion) > 0. Srxlev_lp > 0 relates to LPSS-RSRP, and Squal_lp > 0 relates to LPSS-RSRQ.

[0077] Srxlev_lp and Squal_lp are calculated using the following formulas.

[0078] Srxlev_lp = Q rxlevmeaslp - (Q rxlevminlp + Q rxlevminoffsetlp ) - P compensationlp - Qoffset templp - Qoffset lp Squal_lp = Q qualmeaslp - (Q qualminlp + Q qualminoffsetlp ) - Qoffset templp - Qoffset lp Each term included in the above formula will be explained below.

[0079] Srxlev_lp is the cell selection reception level value (dB) on the low power signal measured by the LP-WUR.

[0080] Squal_lp is the cell selection quality value (dB) on the low power signal measured by LP-WUR.

[0081] Qoffset templpis the offset temporarily applied to the cell.

[0082] Q rxlevmeaslp is the measured cell reception level value (LPSS-RSRP).

[0083] Q qualmeaslp is the measured cell quality (LPSS-RSRQ).

[0084] Q rxlevminlp is the minimum required receive level (dBm) in the cell. This value may be indicated by the system information.

[0085] Q qualminlp is the minimum required quality level (dB) within the cell.

[0086] Q rxlevminoffsetlp is the signaled Q rxlevminlp is an offset to

[0087] Q qualminoffsetlp is the signaled Q qualminlp is an offset to

[0088] P compensationlp is a value that is set according to the difference between frequency bands.

[0089] Qoffsetlp is an offset that is set based on at least one of the following: Metric measured by LP-WUR or Main Radio Metric measured on a low power signal (LP-SS, LP-WUS, etc.) Measured metric that may or may not take into account the power of LP-WUS or SSB Measured metric that may or may not take into account the power of the overlaid OFDM sequence The above Q rxlevminlp , Q qualminlp , Q rxlevminoffsetlp , Q qualminoffsetlp , and P compensationlp Regarding the above, if no low power signals are measured in cells other than the serving cell, the value of the parameter does not exist or is the default value (0), so the criterion can be simplified as follows:

[0090] Srxlev_lp=Qrxlevmeaslp -Qoffset lp Squal_lp=Q qualmeaslp -Qoffset lp

[0091] (Method 2-1-2) The base station 10 and the terminal 20 may consider at least one of the following as intra-frequency and inter-frequency cell reselection criteria for LP-WUR or for measuring low power signals: Metrics of reception level (LPSS-RSRP) and / or reception quality (LPSS-RSRQ) Offset related to waveform information of received low power signals For example, the criteria for intra-frequency cell reselection is when the following conditions are met:

[0092] Srxlev_lp > S IntraSearchPLpand And Squal_lp > S IntraSearchQLp Furthermore, for example, the criteria for inter-frequency cell reselection are when the following conditions are satisfied:

[0093] Srxlev_lp > S nonIntraSearchPLp and Squal_lp > S nonIntraSearchQLp Each term included in the above formula will be explained below.

[0094] S IntraSearchPLp is the threshold (in dB) for Srxlev_lp for intra-frequency measurements when the metric is measured by LP-WUR and / or low power signals.

[0095] S IntraSearchQLp is the threshold (in dB) for Squal_lp for intra-frequency measurements when the metric is measured with LP-WUR and / or low power signals.

[0096] S nonIntraSearchPLp is the threshold (in dB) for Srxlev_lp for inter-frequency and inter-RAT measurements in NR (New Radio) when the metric is measured with LP-WUR and / or low power signals.

[0097] S nonIntraSearchQLpis the value (in dB) of Squal_lp for inter-frequency and inter-RAT measurements in NR when the metric is measured by LP-WUR and / or low power signals.

[0098] To measure metrics with LP-WUR and / or low power signals, intra-frequency only, inter-frequency only, or both intra-frequency and inter-frequency cell reselection criteria may be required or may be set by the base station 10 based on terminal capabilities. Alternatively, intra-frequency and inter-frequency cell reselection criteria may not be required.

[0099] (Method 2-2) Calculation of cell measurement values ​​and beam measurement values ​​(Method 2-2-1) Calculation of cell measurement values ​​The base station 10 may perform configuration for a terminal 20 having LP-WUR or a terminal 20 having the ability to receive low power signals in an RRC connected state (RRC_CONNECTED) to calculate RSRP, RSRQ and SINR measurement values ​​for each cell associated with an NR measurement object.

[0100] The base station 10 may perform configuration for a terminal 20 having LP-WUR or capable of receiving low power signals in idle mode or inactive mode (RRC_IDLE or RRC_INACTIVE) to calculate RSRP and RSRQ measurements for each cell associated with an NR carrier.

[0101] In order to measure different beam measurements corresponding to each SS / PBCH block index, terminal 20 may calculate cell measurements using at least one of Method A and Method B shown below.

[0102] (Method A) Calculate each cell measurement as the linear power scaled average of the highest beam measurements above a threshold (e.g., absThreshCellQuan) so that the total number of averaged beams does not exceed a predefined number (e.g., nofLPSSBeamToAverage).

[0103] (Method B) Calculate each cell measurement value based on the highest beam measurement value in at least one of the following cases: - When a threshold (e.g., absThreshCellQuan) is not set - When a preset number (e.g., nofLPSSBeamToAverage) is not set - When the maximum beam measurement value is equal to or less than a threshold (e.g., absThreshCellQuan) The parameters related to the above threshold and preset number may be the same or different for RRC_CONNECTED mode and RRC_IDLE / RRC_INACTIVE mode.

[0104] (Method 2-2-2) Calculation of Layer 3 Beam Filter Measurement Values ​​The base station 10 and terminal 20 may calculate set beam measurement values ​​for each Layer 3 beam filtered measurement value and apply Layer 3 beam filtering.

[0105] (Method 2-2-3) Layer 3 Filtering The base station 10 and terminal 20 may apply an L3 filtering technique based on existing specifications (as a legacy) to each measurement, including both cell measurements and beam measurements, measured on low-power signals (e.g., LP-SS, LP-WUS) and / or measured by LP-WUR (e.g., as shown in Method 1).

[0106] (Method 2-3) Serving Cell Measurement Procedure (Method 2-3-1) The terminal 20 may measure the metrics of the serving cell (eg, as shown in Method 1) and evaluate the criteria of the serving cell at least once per measurement period.

[0107] Here, the evaluated criteria may include at least one of the following criteria, as shown in Method 2-1: Cell selection criterion S_LP Intra-frequency cell reselection criterion Inter-frequency cell reselection criterion The measurement period configuration may relate to the LPSS-MTC period, the LP-RMTC period, the LP-WUR DRX cycle, the LPSS period, a scaling factor related to the frequency band, the LP-WUR DRX cycle length, the LPSS period length, and the length of the measurement timing configuration.

[0108] For example, the measurement period may be set to N times the period of the LPSS, where N is related to the frequency band and the length of the period of the LPSS.

[0109] Alternatively, for example, the measurement period may be set to M times the DRX cycle of LP-WUR, where M is related to the frequency band and the length of the DRX cycle of LP-WUR.

[0110] (Method 2-3-2) The terminal 20 may filter the measured metrics (e.g., as shown in Method 1) of the serving cell using at least X measurements. In the set of measurements used for filtering, adjacent measurements are spaced apart by at least a period (Y).

[0111] Here, X may be an integer value of 1, 2, or 3 or more. Also, Y may be a value obtained by multiplying any one of a radio frame, a subframe, a time in milliseconds, the DRX cycle of LP-WUR, and the period of LP-SS by A. A may be an integer value or a decimal value. For example, Y may be a value obtained by multiplying the DRX cycle of LP-WUR by 0.5. That is, A=0.5.

[0112] (Method 2-3-3) In the case of measurements on low power signals and / or measurements measured by LP-WUR, the terminal 20 may or may not perform at least one of the following: Cell selection Search for a better cell for cell reselection (including, for example, inter-PLMN and inter-RAT reselection) RAT selection PLMN selection Evaluation of cell selection criterion S_LP Evaluation of cell selection criterion S_LP and intra-frequency cell reselection criteria Evaluation of cell selection criterion S_LP, intra-frequency cell reselection criteria, and inter-frequency cell reselection criteria (Method 2-3-4) When performing the procedures of Method 2-3-1 to Method 2-3-2 for multiple beam operation, the terminal 20 uses at least one of the following methods: Use L1 and / or L3 beam measurements with or without using a filtering method based on Method 2-3-2 and / or Method 2-2-3. Use beam measurements implemented by the terminal 20. Use L1 and / or L3 cell measurements calculated with or without a filtering method using Method 2-2-1. Use cell measurements implemented by the terminal 20.

[0113] (Method 2-4) Parameter Setting The base station 10 and terminal 20 may use common, separated, partially common, and partially separated parameter information elements (IEs) for the parameters of methods 2-1 to 2-3 between low power measurement and main radio measurement. Furthermore, when the same parameter is used between low power measurement and main radio measurement, different values ​​may be set for the same parameter depending on whether the measurement is performed in low power measurement or main radio measurement.

[0114] For example, the base station 10 and the terminal 20 may use partially common parameters (Qrxlevmin, Qrxlevminoffset, Pcompensation, Qoffsettemp) and partially separate parameters (Qrxlevmeaslp, etc.), and may use these parameters to calculate the low power level reference (Srxlev_lp) described in method 2-1.

[0115] Srxlev_lp = Qrxlevmeaslp - (Qrxlevmin + Qrxlevminoffset) - Pcompensation - Qoffsettemp - Qoffsetlp

[0116] Additionally, values ​​for common parameters, eg, Qrxlevmin, Qrxlevminoffset, Pcompensation, and Qoffsettemp, may be set to 0 for low power measurements and other values ​​for primary radio measurements.

[0117] Also, for example, in calculating the cell quantity, a threshold (eg, absThreshCellQuan) and a preset value (eg, nofLPSSBeamToAverage) using separate parameter IEs may be used.

[0118] In addition, the parameters shown in Methods 2-1 to 2-3 may be notified, for example, from the base station 10 to the terminal 20 by system information having an existing SIB (System Information Block) type or a new SIB type, and / or RRC configuration.

[0119] The above-described embodiments allow for defining procedures for measurements on low-power signals in wireless communication systems.

[0120] The above-described embodiments allow for defining procedures for measurements on low-power signals in wireless communication systems.

[0121] (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.

[0122] <Base Station 10> Fig. 5 is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention. As shown in Fig. 5, 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. 5 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations according to the embodiment of the present invention.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] <Terminal 20> Fig. 6 is a diagram showing an example of the functional configuration of the terminal 20 in an embodiment of the present invention. As shown in Fig. 6, 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. 6 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0127] 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.

[0128] As described in the embodiment, the control unit 240 controls the settings, instructions, and notifications related to the low-power wakeup 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.

[0129] (Hardware Configuration) The block diagrams (FIGS. 5 and 6) 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.

[0130] 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.

[0131] 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. 7 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 5 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. 6 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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).

[0140] 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.

[0141] 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.

[0142] Fig. 8 shows an example configuration of a vehicle 2001. As shown in Fig. 8, 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.

[0143] 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.

[0144] 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).

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] <Configuration related to this embodiment> (Item 1) A terminal comprising: a receiving unit that receives a synchronization signal, a low-power synchronization signal, and a low-power wake-up signal; and a control unit that calculates a low-power reception level standard and a low-power reception quality standard used in cell selection criteria in serving cell measurements, based on a low-power synchronization signal reference signal reception power and a low-power synchronization signal reference signal reception quality measured using at least one of the synchronization signal, the low-power synchronization signal, and the low-power wake-up signal, wherein, in calculating the low-power reception level standard and the low-power reception quality standard, the control unit uses an offset that is set based on at least one of: a measurement value measured in a low-power receiver or a primary wireless receiver; and a measurement value calculated based on the low-power synchronization signal or the low-power wake-up signal. (Clause 2) The terminal according to Supplementary Clause 1, wherein the control unit performs intra-frequency cell reselection using intra-frequency cell reselection criteria based on whether the low-power reception level criterion exceeds a first threshold related to intra-frequency measurements and the low-power reception quality criterion exceeds a second threshold related to intra-frequency measurements, and performs inter-frequency cell reselection using inter-frequency cell reselection criteria based on whether the low-power reception level criterion exceeds a second threshold related to inter-frequency and inter-RAT (Radio Access Technology) measurements in NR (New Radio) and the low-power reception quality criterion exceeds a third threshold related to inter-frequency and inter-RAT measurements in NR. (Clause 3) A terminal having: a receiving unit that receives a synchronization signal, a low-power synchronization signal, and a low-power wake-up signal; and a control unit that uses at least one of the synchronization signal, the low-power synchronization signal, and the low-power wake-up signal to calculate, as a cell measurement value, a linear power scale average of highest beam measurement values ​​such that a total number of averaged beams does not exceed a preset number and exceeds a set threshold, using the synchronization signal, the low-power synchronization signal, and the low-power wake-up signal. (Clause 4) The terminal according to Supplementary clause 2, wherein the control unit performs evaluation of at least one of the cell selection criterion, the intra-frequency cell reselection criterion, and the intra-frequency cell reselection criterion at least once per set measurement period.(Clause 5) The terminal described in any one of Supplementary clauses 1 to 3, wherein the control unit uses at least one of information elements of parameters that are common, separated, partially common, and partially separated between low power measurement and primary radio measurement for parameters used when performing measurements, and when the same parameter is used between low power measurement and primary radio measurement, allows different values ​​to be set for the same parameter depending on whether the measurement is performed in low power measurement or primary radio measurement. (Clause 6) A base station having: a control unit that performs configuration for a terminal having a low-power receiver or a terminal capable of receiving a low-power signal in a connected state to measure the low-power synchronization signal reference signal reception power, low-power synchronization signal reference signal reception quality, and low-power synchronization signal reception signal strength for each cell, or that performs configuration for a terminal having a low-power receiver or a terminal capable of receiving a low-power signal in an idle mode or an inactive mode to perform measurements of the low-power synchronization signal reference signal reception power and low-power synchronization signal reference signal reception quality for each cell; and a transmission unit that transmits at least one of a synchronization signal, a low-power synchronization signal, and a low-power wake-up signal to the terminal based on the configuration.

[0153] Any of the above configurations can define procedures for measurements on low power signals in a wireless communication system.

[0154] (Supplementary Notes on the Embodiments) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; 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 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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).

[0159] 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.

[0160] 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.

[0161] 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).

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0180] 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."

[0181] 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.

[0182] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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."

[0202] 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.

[0203] 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.

[0204] 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."

[0205] 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).

[0206] 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.

[0207] 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 synchronization signal, a low-power synchronization signal, and a low-power wake-up signal; and a control unit that calculates a low-power reception level standard and a low-power reception quality standard to be used as cell selection criteria in serving cell measurements based on a low-power synchronization signal reference signal reception power and a low-power synchronization signal reference signal reception quality measured using at least one of the synchronization signal, the low-power synchronization signal, and the low-power wake-up signal, wherein, in calculating the low-power reception level standard and the low-power reception quality standard, the control unit uses an offset that is set based on at least one of: a measurement value measured in a low-power receiver or a primary radio receiver; and a measurement value calculated based on the low-power synchronization signal or the low-power wake-up signal.

2. The terminal according to claim 1, wherein the control unit performs intra-frequency cell reselection using an intra-frequency cell reselection criterion based on whether the low-power reception level criterion exceeds a first threshold related to intra-frequency measurements and whether the low-power reception quality criterion exceeds a second threshold related to intra-frequency measurements, and performs inter-frequency cell reselection using an inter-frequency cell reselection criterion based on whether the low-power reception level criterion exceeds a second threshold related to inter-frequency and inter-RAT (Radio Access Technology) measurements in NR (New Radio) and whether the low-power reception quality criterion exceeds a third threshold related to inter-frequency and inter-RAT measurements in NR.

3. A terminal having: a receiving unit that receives a synchronization signal, a low-power synchronization signal, and a low-power wake-up signal; and a control unit that uses at least one of the synchronization signal, the low-power synchronization signal, and the low-power wake-up signal to calculate, as a cell measurement value, a linear power scale average value of the highest beam measurement value that does not exceed a predetermined number and that exceeds a set threshold.

4. The terminal according to claim 2, wherein the control unit performs evaluation of at least one of the cell selection criterion, the intra-frequency cell reselection criterion, and the intra-frequency cell reselection criterion at least once per set measurement period.

5. The terminal according to any one of claims 1 to 3, wherein the control unit uses at least one of information elements of parameters that are common, separated, partially common, and partially separated between low-power measurement and primary radio measurement for parameters used when performing measurements, and when the same parameter is used between low-power measurement and primary radio measurement, allows different values ​​to be set for the same parameter depending on whether the measurement is performed in low-power measurement or primary radio measurement.

6. A base station having: a control unit that performs configuration for a terminal having a low-power receiver or a terminal capable of receiving a low-power signal in a connected state to measure the low-power synchronization signal reference signal reception power, low-power synchronization signal reference signal reception quality, and low-power synchronization signal reception signal strength for each cell, or that performs configuration for a terminal having a low-power receiver or a terminal capable of receiving a low-power signal in an idle mode or an inactive mode to perform measurements of the low-power synchronization signal reference signal reception power and low-power synchronization signal reference signal reception quality for each cell; and a transmission unit that transmits at least one of a synchronization signal, a low-power synchronization signal, and a low-power wake-up signal to a terminal based on the configuration.

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