Terminal and communication method

Abstract

A terminal according to the present invention includes: a reception unit that receives a low-power synchronization signal or a low-power wake-up signal; and a control unit that executes synchronization or measurement when the low-power synchronization signal is received, and activates a main radio (MR) when the low-power wake-up signal is received. The control unit determines which signal to receive when the low-power synchronization signal or low-power wake-up signal and another low-power synchronization signal or low-power wake-up signal conflict.

Description

Terminal and communication method

[0001] The present invention relates to a terminal and a communication method 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 as its object to receive a low-power signal in a wireless communication system using a low-power wake-up receiver (LP-WUR).

[0006] According to the disclosed technology, a terminal is provided that has a receiving unit that receives a low-power synchronization signal or a low-power wake-up signal, and a control unit that performs synchronization or measurement when the low-power synchronization signal is received and activates MR (Main Radio) when the low-power wake-up signal is received, wherein the control unit determines which signal to receive when the low-power synchronization signal or the low-power wake-up signal collides with another low-power synchronization signal or low-power wake-up signal.

[0007] According to the disclosed technology, a low power signal can be received by a low power wake-up receiver (LP-WUR) 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. 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 procedure for radio resource management (RRM) using low-power radio in an embodiment of the present invention. FIG. 3 is a diagram for explaining an example of receiving a low-power signal in an embodiment of the present invention. FIG. 4 is a diagram for explaining an example (1) of collision of low-power signals in an embodiment of the present invention. FIG. 5 is a diagram for explaining an example (2) of collision of low-power signals in an embodiment of the present invention. FIG. 6 is a diagram for explaining an example of the functional configuration of a base station 10 in an embodiment of the present invention. FIG. 7 is a diagram for explaining 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 for explaining 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 TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (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, further RRM relaxation in the UE MR for both serving cell measurements and neighbor cell measurements, and UE serving cell RRM measurements 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 > 20 ms and DRX cycle ≦ 0.64 s, then M1 = 2, otherwise M1 = 1. Also, N1 = 1 in FR1 and N1 = 3-12 in 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, the initial synchronization with the SSB should be performed by the MR, and the fine synchronization with the LP-SS is performed by the LP-SS / LP-WUS detection.

[0028] For serving cell measurements on low-power signals, including LP-SS, LP-WUS, and other possible signals that LP-WUR can detect, consideration is also required for measurement metrics, measurement timing configuration, measurement criterion, and derivation and procedures of cell and beam measurement results.

[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] Operation 1) Detection and synchronization by LP-WUR will be described below. Initial synchronization and fine synchronization using SSB may be performed by MR. Note that initial synchronization may be replaced by coarse synchronization. Further synchronization by LP-SS and / or LP-WUS may be performed by detecting LP-SS and / or LP-WUS with LR. Hereinafter, LP-SS and / or LP-WUS will also be referred to as LP-SS / LP-WUS.

[0033] 4 is a diagram showing an example of receiving a low-power signal according to an embodiment of the present invention. In step S101, the BS 10 transmits a notification related to the LP-SS / LP-WUS to the UE 20. In step S102, the UE 20 sets the LP-WUR based on the notification. In step S103, the BS 10 transmits the LP-SS / LP-WUS to the UE 20. In step S104, the UE 20 detects or receives the LP-SS / LP-WUS and performs synchronization, RRM measurement, or MR activation.

[0034] Operation 1-1) Setting of low power synchronization signal and low power wake-up signal (LP-SS / LP-WUS) will be described. The low power signal for UE may have one, more than one, or all of the following features 1)-10).

[0035] 1) The waveform of the low power signal for the UE may be, for example, one or more of the following: - May be only OOK-1 and / or OOK-4. - An OFDM sequence may be overlaid on OOK-1 and / or OOK-4. - An OFDM sequence may be overlaid on OOK-1 and OOK-4. - A sequence type and an OOK index may be defined. - A sequence type and an index of the OFDM to be overlaid (e.g., ZC-root, CS index, etc.)

[0036] 2) Regarding the period, offset, and time position, for example, the unit of the period and offset may be a radio frame, a subframe, ms, a DRX cycle, etc. The unit of the time position may be a slot, a subframe, a symbol, etc.

[0037] 3) The period may be specified, for example, by the number of OFDM symbols, number of slots, number of subframes, or length in ms occupied by the LP-SS / LP-WUS.

[0038] 4) For spatial correspondence and number of repetitions, for example:

[0039] The UE may assume beam alignment between the low power signal or the actually transmitted SSB as per Alt. 1 and / or Alt. 2 below.

[0040] Alt. 1) When the BS applies all beam patterns to transmit LP-SS / LP-WUS, the beams may correspond one-to-one to the SSBs actually transmitted, and the UE may apply one beam of the beam patterns to receive the LP-SS / LP-WUS using the spatial domain receive filter or spatial receive parameters used when receiving the corresponding SSB.

[0041] Alt. 2) The UE may assume that the same spatial domain receive filter or spatial receive parameters are applied to the low power signal, e.g., the same spatial domain receive filter or spatial receive parameters are applied to the last measured SSB, the best reported SSB, or the last reported SSB.

[0042] In each period, a repetition may be set in which a low-power signal associated with one SSB is transmitted multiple times. For example, when the number of repetitions is R and the number of SSBs actually transmitted is N (for example, as indicated by ssb-PositionsInBurst), the repetition may be performed as follows:

[0043] When the list of LP-SSs or the plurality of LP-SSs includes N×R LP-SSs, the following Alt. 1) or Alt. 2) may be performed.

[0044] Alt. 1) An LP-SS with index {i, N+i, 2N+i, ..., (r-1)N+i} may be associated with the i-th SSB actually transmitted. For example, this SSB may correspond to the i-th bit from the left that is 1 in ssb-PositionsInBurst. i may be 0 to N, and r may be a repetition index, r may be 0 to R, and r may be 0 to R, and r may be 1 to R.

[0045] Alt. 2) The LP-SS with index {Rxi, Rxi+1, Rxi+2, ..., Rxi+R-1} may be associated with the i-th SSB actually transmitted. For example, this SSB may correspond to the i-th bit from the left that is 1 in ssb-PositionsInBurst. i may be greater than or equal to 0 and less than N. r is a repetition index, and r may be greater than or equal to 0 and less than R.

[0046] 5) Regarding the frequency location, for example, the frequency of the starting location may be specified, or the number of RBs to be occupied or the bandwidth to be occupied may be specified.

[0047] 6) Regarding the transmission power, for example, the absolute EPRE (Energy per resource element) or the relative EPRE may be compared with existing signals. For example, the same value may be set by comparing with PSS, SSS, PBCH, and SSB. The transmission power of LP-SS and LP-WUS may be the same or different.

[0048] 7) Regarding the SCS, for example, the SCS of the LP-SS / LP-WUS may be the same as or different from the NR SSB, PDSCH, or PDCCH. The SCS of the LP-SS and LP-WUS may be the same as or different from the NR SSB, PDSCH, or PDCCH.

[0049] 8) Regarding information related to the cell ID, for example, the LP-SS / LP-WUS may include part of the cell ID, or may include other IDs or values ​​for cell identification.

[0050] 9) Regarding the UE-ID or UE group ID for which LP-SS / LP-WUS is triggered, for example, a UE-specific LP-WUR-ID different from the UE-ID may be defined as a target for low power signals. For example, a UE group ID may be defined as a target for low power signals. The triggering granularity may depend on the RRC state. For example, different triggering granularities may be applied to different RRC states. For example, triggering may be based on subgroup IDs for the RRC_IDLE and RRC_INACTIVE states, and on UE-IDs for the RRC_CONNECTED state. For example, triggering may be based on subgroup ID-A for the RRC_IDLE and RRC_INACTIVE states, and on subgroup ID-B for the RRC_CONNECTED state, where the number of subgroup ID-A may be smaller than the number of subgroup ID-B.

[0051] 10) The bits and associated fields carried by the OOK waveform and / or the sequence index of the overlaying OFDM sequence may contain one or more of the following information:

[0052] - Bit size, total bit size, bit size of each field, bit size of a specific field - Information related to timing or SFN (System Frame Number), for example, it may be a modified 4th bit of SFN - Information on not executing a trigger in the case of LP-SS, or executing a trigger including MR activation and activation type.

[0053] Operation 1-2) Notification related to the setting of LP-SS / LP-WUS will be explained below.

[0054] The configuration of LP-SS and LP-WUS for a UE may be configured separately in two different information elements (IEs), or some parameters may be configured in a common IE and other parameters may be configured in separate IEs. The configuration and transmission of low power signals may be cell-specific (common to all UEs), UE group-specific (common to UEs in a group), or UE-specific.

[0055] The low power signal setting may be signaled by one or more of Alt. 1)-Alt. 4) shown below.

[0056] Alt. 1) May be notified by RRC signaling. The low power signal configuration may be notified when the UE is in RRC connected mode.

[0057] Alt. 2) It may be signaled by system information. The low power signaling setting may be signaled in either RRC connected mode, IDLE mode or INACTIVCE mode.

[0058] Alt. 2-1) It may be notified by an existing SIB type (e.g., SIB1 or SIBx). For example, the low power signaling setting may be inserted into an IE of SIBx. For example, a new IE (e.g., SIB1-v1900-IEs) may be defined, and the new IE may include the low power signaling setting. The following shows an example of the new IE, SIB1-v1900-IEs.

[0059] SIB1-v1800-IEs ::= SEQUENCE { ...(same as legacy) nonCriticalExtension SIB1-v1900-IEs OPTIONAL} SIB1-v1900-IEs ::= SEQUENCE { lpsslpwusCommon LPSS-LPWUS-COMMON-Config-r19, OPTIONAL lpssConfig-r19 LPSS-Config-r19, OPTIONAL lpwusConfig-r19 LPWUS-Config-r19, OPTIONAL nonCriticalExtension SEQUENCE {} OPTIONAL}

[0060] Alt. 2-2) It may be notified by a new SIB type. For example, a new SIB type (e.g., SIBn-r19) may be defined to include the low power signal setting. The transmission mode of the new SIB may be set to broadcast or non-broadcast depending on the setting. Also, the transmission mode of the new SIB may be set to broadcast only or non-broadcast only. For example, broadcast only means that the new SIB is set to "Broadcasting" only.

[0061] Alt. 3) DCI may be used to signal some parameters to be applied to low-power signals, select a set to be applied to low-power signals, or select a set of parameters to be applied to low-power signals. A set of parameters to be applied to low-power signals may be selected. A new DCI format (e.g., DCI format 2_x) may be defined, and the new DCI set may include the low-power signal configuration to be applied. The DCI signaling the low-power signal configuration may be scrambled with a legacy RNTI or a new RNTI. The legacy RNTI may be a C-RNTI, a P-RNTI, a PEI-RNTI, etc. The new RNTI may be, for example, a LP-RNTI, which may be common to all UEs, UEs in a cell, UEs in a group, or individual UEs.

[0062] Alt. 4) The low power signal configuration may be signaled by the MAC-CE, which may be used to signal some parameters to apply to the low power signal, select a set to apply to the low power signal, or select a set of parameters to apply to the low power signal.

[0063] Operation 1-3) The UE synchronization operation related to LP-SS / LP-WUS will be described below.

[0064] The LP-WUR included in the UE may receive the signals shown in 1)-5) below to perform synchronization and / or cell search.

[0065] 1) LP-SS, which is an OOK-1 and / or OOK-4 waveform with no OFDM sequence overlaid. 2) LP-SS, which is an OOK-1 and / or OOK-4 waveform with an OFDM sequence overlaid. 3) LP-WUS, which is an OOK-1 and / or OOK-4 waveform with no OFDM sequence overlaid. 4) LP-WUS, which is an OOK-1 and / or OOK-4 waveform with an OFDM sequence overlaid. 5) If the LP-WUS can receive existing PSS, SSS, PBCH, or TRS, PSS, SSS, PBCH, or TRS.

[0066] The UE may assume the conditions for synchronization and / or cell search using LP-SS / LP-WUS as set forth in Alt. 1) or Alt. 2) below. The conditions for synchronization and / or cell search may include methods and / or steps for synchronization and / or cell search, and may include conditions for determining whether synchronization and / or cell search is successful or unsuccessful.

[0067] Alt. 1) The condition may be specified by a specification. Alt. 2) It may be configured via RRC signaling and / or system information.

[0068] If the LP-WUR is not successful in synchronizing and / or cell search using the LP-SS / LP-WUS and the MR is in sleep mode, the UE may wake up the MR for synchronization and / or cell search. Also, if the LP-WUR is not successful in synchronizing and / or cell search using the LP-SS / LP-WUS and the MR is in active mode, the MR may perform synchronization and / or cell search, and the operation may depend on the UE implementation.

[0069] Based on the notification shown in action 1-1) and / or action 1-2), the UE may assume that it will transmit LP-SS / LP-WUS applying the power settings of the configured time-frequency resources.

[0070] For synchronization and / or cell search, the UE may receive the target LP-SS / LP-WUS based on the settings shown in operation 1-1) by performing 1) and / or 2) below.

[0071] 1) Detect the bits carried by the OOK waveform and / or the sequence index of the overlaid OFDM sequence, which contains one or more pieces of information as follows:

[0072] The information may be information related to timing or SFN, for example, the lowest 4 bits of SFN. The information may be information related to a cell ID, for example, an ID or a value for cell identification. The information may be a UE-specific LP-WUR-ID or a UE group ID targeting the LP-SS / LP-WUS. A UE-specific LP-WUR-ID may refer to an ID for a UE that can receive low-power signals using an LP-WUR. The information may be information related to triggering, activation, or deactivation. For example, the information may indicate that only the LP-SS triggers MR activation.

[0073] 2) Only when one or more of the following conditions are met, LP-SS / LP-WUS may be received and synchronized, or LP-SS / LP-WUS may be detected.

[0074] The condition may be that the information related to the cell set as in operation 1-1) matches the information related to the detected cell. The condition may be that the detected UE-specific LP-WUR-ID or UE group ID matches the information related to the UE-specific LP-WUR-ID or UE group ID set by operation 1-1). The condition may be that the detected UE group ID matches the UE group ID to which the UE belongs based on a predefined grouping rule.

[0075] Operation 1A) The procedure for when LP-SS and LP-WUS collide will be explained below.

[0076] There are three types of low power signals with the characteristics shown in Table 1.

[0077]

[0078] As shown in Table 1, the low power signals are LP-SS, LP-WUS in RRC_IDLE or INACTIVCE state, and LP-WUS in RRC_CONNECTED state. LP-SS is used for synchronization and RRM measurements. LP-WUS is used for MR activation.

[0079] 5 is a diagram showing an example (1) of collision of low-power signals in an embodiment of the present invention. As shown in FIG. 5, there are two types of collision between low-power signals. One is referred to as a Type A collision, and the other is referred to as a Type B collision.

[0080] Type A collision occurs when the transmission opportunities of two low-power signals partially overlap in the time domain but do not overlap in the frequency domain, as shown in Figure 5. For example, due to limitations such as the reception bandwidth of the LP-WUR, the LP-WUR may not be able to receive both signals.

[0081] Type B collision refers to the case where the transmission opportunities of two low power signals partially overlap in the time and frequency domains.

[0082] Operation 1A-1) A case where an LP-SS collides with an LP-WUS will be described. The LP-WUS may be either 1) or 2) below.

[0083] 1) LP-WUS used by UEs in RRC_IDLE / INACTIVE state to perform MR activation for paging occasion monitoring. 2) LP-WUS used by UEs in RRC_CONNECTED state to perform MR activation for PDCCH monitoring.

[0084] In a Type A collision, the UE may receive both low power signals if it is able to receive both low power signals.

[0085] In a Type A collision, if the UE is unable to receive both low-power signals, for example due to limitations in the reception bandwidth of the LP-WUR, the UE may expect to receive one or more signals as shown in 1)-5) below.

[0086] 1) The UE may receive only the LP-SS. 2) The UE may receive only the LP-WUS. 3) If a collision occurs between the LP-SS and the LP-WUS used by a UE in RRC_IDLE / INACTIVE state, the UE may receive either the LP-SS or the LP-WUS used by a UE in RRC_IDLE / INACTIVE state. 4) If a collision occurs between the LP-SS and the LP-WUS used by a UE in RRC_CONNECTED state, the UE may receive either the LP-SS or the LP-WUS used by a UE in RRC_CONNECTED state.

[0087] 5) The UE may receive any of the following low power signals: - A low power signal near the center, near one edge, or at a low frequency position of the BS's transmission bandwidth. - A low power signal in the same or close frequency range as the last low power signal received by the UE. - A low power signal whose transmission started earlier in the time domain. - A low power signal notified to the BS. For example, it may be notified in system information, RRC signaling, MAC-CE, or DCI. - A low power signal notified to multiple UEs. For example, if the number of UEs to which an LP-WUS for the RRC_IDLE / INACTIVE state is notified is greater than the number of UEs to which an LP-WUS for the RRC_CONNECTED state is notified, and if an LP-WUS for the RRC_IDLE / INACTIVE state and an LP-WUS for the RRC_CONNECTED state collide, the LP-WUS for the RRC_IDLE / INACTIVE state may be received.

[0088] In a Type B collision, the UE may assume one or more of the following 1)-4).

[0089] 1) When an LP-SS and an LP-WUS used by a UE in RRC_IDLE / INACTIVE state collide, the BS may transmit the entire signal of the LP-SS or the entire signal of the LP-WUS used by the UE in RRC_IDLE / INACTIVE state. Signals other than the entire signal may not be transmitted at all, or the overlapping parts may not be transmitted.

[0090] 2) When an LP-SS and an LP-WUS used by a UE in an RRC_CONNECTED state collide, the BS may transmit the entire signal of the LP-SS or the entire signal of the LP-WUS used by the UE in an RRC_CONNECTED state. Signals other than the entire signal may not be transmitted at all, or the overlapping parts may not be transmitted.

[0091] 3) Figure 6 shows an example (2) of low-power signal collision in an embodiment of the present invention. The BS may completely transmit the low-power signal that starts transmission earlier. The low-power signal that starts transmission later may not be transmitted at all (Case #2 in Figure 6), or only the overlapping time region may not be transmitted (Case #1 in Figure 6).

[0092] 4) The BS may transmit the low-power signal that starts later in the transmission completely, and the low-power signal that starts earlier in the transmission may not be transmitted at all (case #4 in Figure 6) or only the overlapping time region (case #3 in Figure 6).

[0093] Operation 1A-2) A case where an LP-WUS used for a UE in the RRC_IDLE / INACTIVE state and an LP-WUS used for a UE in the RRC_CONNECTED state collide will be described.

[0094] In a Type A collision, the UE may receive both low power signals if it is able to receive both low power signals.

[0095] In a Type A collision, if the UE is unable to receive both low-power signals, for example due to limitations in the reception bandwidth of the LP-WUR, the UE may expect to receive one or more signals as shown in 1)-3) below.

[0096] 1) The UE may only receive LP-WUS used for UEs in RRC_IDLE / INACTIVE state. 2) The UE may only receive LP-WUS used for UEs in RRC_CONNECTED state.

[0097] 3) The UE may receive any of the following low power signals: - A low power signal near the center, near one edge, or at a low frequency position of the BS's transmission bandwidth. - A low power signal in the same or close frequency range as the last low power signal received by the UE. - A low power signal whose transmission started earlier in the time domain. - A low power signal notified to the BS. For example, it may be notified in system information, RRC signaling, MAC-CE, or DCI. - A low power signal notified to multiple UEs. For example, if the number of UEs to which an LP-WUS for the RRC_IDLE / INACTIVE state is notified is greater than the number of UEs to which an LP-WUS for the RRC_CONNECTED state is notified, and if an LP-WUS for the RRC_IDLE / INACTIVE state and an LP-WUS for the RRC_CONNECTED state collide, the LP-WUS for the RRC_IDLE / INACTIVE state may be received.

[0098] In a Type B collision, the UE may assume one or more of the following 1)-3).

[0099] 1) The BS may transmit the entire signal of the LP-WUS used for UEs in the RRC_IDLE / INACTIVE state or the entire signal of the LP-WUS used for UEs in the RRC_CONNECTED state. Signals other than the entire signal may not be transmitted at all, or overlapping parts may not be transmitted.

[0100] 2) The BS may transmit the low-power signal that starts transmission earlier completely, and the low-power signal that starts transmission later may not be transmitted at all (Case #2 in Figure 6) or only the overlapping time region (Case #1 in Figure 6).

[0101] 3) The BS may transmit the low-power signal that starts later in full, and the low-power signal that starts earlier in full may not be transmitted at all (case #4 in Figure 6) or only the overlapping time region (case #3 in Figure 6).

[0102] Operation 1A-3) UE operation when LB-SS is not received due to collision will be described. When the UE cannot receive LB-SS due to collision, the UE may or may not use LP-WUS for synchronization and / or cell search and / or RRM measurement. When LP-WUS is used for RRM measurement, one or more of the following 1) to 5) may be applied.

[0103] 1) If an LP-SS has a Type A or Type B collision with an LP-WUS, the LP-WUS may be used for RRM measurements. 2) If the LP-SS and LP-WUS have the same bandwidth or frequency range, the LP-WUS may be used for RRM measurements. 3) The LP-WUS in which the entire signal is transmitted may be used for RRM measurements. 4) The portion of the LP-WUS in the time and / or frequency domain that overlaps with the LP-SS may be used for RRM measurements. 5) The LP-WUS within the measurement timing configuration (MTC) window period of the LP-SS may be used for RRM measurements.

[0104] Operation 1A-4) UE operation when LP-WUS is not received. If a UE in RRC_IDLE / INACTIVE state does not receive LP-WUS due to a collision, the UE may assume one or more of the following actions 1)-3).

[0105] 1) The UE may assume that there was no LP-WUS transmission and the MR may continue to sleep. 2) The UE may assume that there was an LP-WUS transmission and may activate the MR. 3) If the UE partially detects an LP-WUS transmission, it may assume that there was an LP-WUS transmission and may activate the MR.

[0106] If a UE in RRC_CONNECTED state does not receive LP-WUS due to a collision, the UE may assume one or more of the following 1)-3).

[0107] 1) The UE may assume that there was no LP-WUS transmission and the MR may continue to sleep. 2) The UE may assume that there was an LP-WUS transmission and may activate the MR. 3) If the UE partially detects an LP-WUS transmission, it may assume that there was an LP-WUS transmission and may activate the MR.

[0108] According to the above-described embodiment, in a wireless communication system, a setting for using a low-power signal can be received from a base station, and the setting can be executed to receive the low-power signal at the LP-WUR.

[0109] That is, in a wireless communication system, a low power signal can be received by a low power wake-up receiver (LP-WUR).

[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> Figure 7 is a diagram showing an example of the functional configuration of the base station 10 according to an embodiment of the present invention. As shown in Figure 7, 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 Figure 7 is merely an example. The names of the functional divisions and functional units may be any names as long as they can perform the operations according to the embodiment of the present invention.

[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. 8 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. 8, 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. 8 is merely an example. As long as the operations related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[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 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.

[0118] (Hardware Configuration) The block diagrams (FIGS. 7 and 8) 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 also 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. 9 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. 7 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. For example, the control unit 240 of the terminal 20 shown in FIG. 8 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. 10 shows an example configuration of a vehicle 2001. As shown in Fig. 10, 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 Related to the Present Embodiment> (Item 1) A terminal including: a receiving unit that receives a low power synchronization signal or a low power wakeup signal; and a control unit that performs synchronization or measurement when receiving the low power synchronization signal and activates a main radio (MR) when receiving the low power wakeup signal, wherein the control unit determines a signal to receive when the low power synchronization signal or the low power wakeup signal collides with another low power synchronization signal or low power wakeup signal. (Item 2) The terminal according to item 1, wherein the receiving unit receives the low power synchronization signal or the low power wakeup signal when they collide in the time domain but not in the frequency domain. (Item 3) The terminal according to claim 1, wherein the receiving unit receives the entire signal that was transmitted earlier in the time domain when the low power synchronization signal and the low power wakeup signal collide in both the time domain and the frequency domain. (4) The terminal according to claim 1, wherein the receiver receives the first low power wakeup signal or the second low power wakeup signal when a first low power wakeup signal intended for a terminal in an RRC_IDLE or RRC_INACTIVE state and a second low power wakeup signal intended for a terminal in an RRC_CONNECTED state collide in the time domain but do not collide in the frequency domain. (5) The terminal according to claim 1, wherein the controller performs synchronization, cell identification, or measurement using the low power wakeup signal when the terminal is unable to receive the low power synchronization signal due to a collision. (Clause 6) A communication method in which a terminal executes the following steps: receiving a low-power synchronization signal or a low-power wake-up signal; performing synchronization or measurement when the low-power synchronization signal is received, and activating MR (Main Radio) when the low-power wake-up signal is received; and determining which signal to receive when the low-power synchronization signal or the low-power wake-up signal collides with another low-power synchronization signal or low-power wake-up signal.

[0142] With any of the above configurations, a low power signal can be received by a low power wake-up receiver (LP-WUR) in a wireless communication system. Also, in the wireless communication system, a setting for using a low power signal can be received from a base station, and the setting can be executed to receive the low power signal by the LP-WUR.

[0143] (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.

[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), 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.

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

[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 sent to another device.

[0150] 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).

[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 having a receiving unit that receives a low-power synchronization signal or a low-power wake-up signal, and a control unit that performs synchronization or measurement when the low-power synchronization signal is received and activates an MR (Main Radio) when the low-power wake-up signal is received, wherein the control unit determines which signal to receive when the low-power synchronization signal or the low-power wake-up signal collides with another low-power synchronization signal or low-power wake-up signal.

2. The terminal according to claim 1, wherein the receiving unit receives the low-power synchronization signal or the low-power wake-up signal when the low-power synchronization signal and the low-power wake-up signal collide in the time domain but do not collide in the frequency domain.

3. The terminal according to claim 1, wherein the receiving unit receives the entire signal transmitted earlier in the time domain when the low-power synchronization signal and the low-power wake-up signal collide in the time domain and the frequency domain.

4. The terminal according to claim 1, wherein the receiving unit receives the first low power wakeup signal or the second low power wakeup signal when a first low power wakeup signal intended for a terminal in an RRC_IDLE or RRC_INACTIVE state and a second low power wakeup signal intended for a terminal in an RRC_CONNECTED state collide in the time domain but do not collide in the frequency domain.

5. The terminal according to claim 1, wherein the control unit uses the low-power wake-up signal to perform synchronization, cell identification, or measurement when the low-power synchronization signal cannot be received due to a collision.

6. A communication method in which a terminal executes the following steps: receiving a low-power synchronization signal or a low-power wake-up signal; performing synchronization or measurement when the low-power synchronization signal is received, and activating MR (Main Radio) when the low-power wake-up signal is received; and determining which signal to receive when the low-power synchronization signal or the low-power wake-up signal collides with another low-power synchronization signal or low-power wake-up signal.

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