Terminal, base station, and communication method

Abstract

This terminal comprises: a control unit that determines a reception occasion of a low-power synchronization signal on the basis of the number of beams associated with the low-power synchronization signal and the number of low-power synchronization signals for each beam within the transmission cycle of the low-power synchronization signal; and a reception unit that receives the low-power synchronization signal at the reception occasion. When the reception occasion and an uplink signal or a downlink signal other than the low-power synchronization signal overlap, the control unit determines: not to allow reception of an overlapping low-power synchronization signal; to allow reception of an overlapping low-power synchronization signal; or not to assume the overlap.

Description

Terminal, base station, and communication method

[0001] The present invention relates to a terminal, a base station, 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 V18.1.0 (2024-03)

[0004] In 3GPP Rel-19, an ultra-low power wake-up signal (Low Power (LP)-WUS) is being studied to further reduce the power consumption of conventional WUS (Wake-Up Signal). An efficient method for LP-SS (Synchronization Signal), which is a synchronization signal for monitoring LP-WUS, is also being studied.

[0005] The present invention has been made in view of the above points, and has an object to clarify a method for transmitting and receiving a synchronization signal for a low-power wakeup signal in a wireless communication system.

[0006] According to the disclosed technology, a terminal is provided which has a control unit that determines a reception opportunity for a low power synchronization signal based on the number of beams associated with the low power synchronization signal and the number of low power synchronization signals for each beam within a transmission period of the low power synchronization signal, and a receiving unit that receives the low power synchronization signal at the reception opportunity, and the control unit determines whether to not allow reception of the overlapping low power synchronization signal, allow reception of the overlapping low power synchronization signal, or not assume the overlap when the reception opportunity overlaps with an uplink signal or a downlink signal other than the low power synchronization signal.

[0007] According to the disclosed technology, it is possible to clarify the method of transmitting and receiving a synchronization signal for a low-power wakeup signal 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 communication by LP-WUS and LP-WUR in an embodiment of the present invention. FIG. 3 is a diagram for explaining SSB in an embodiment of the present invention. FIG. 4 is a diagram for explaining LP-SS in an embodiment of the present invention. FIG. 5 is a diagram for explaining proposal 2 in an embodiment of the present invention. FIG. 6 is a first diagram for explaining proposal 3-1 in an embodiment of the present invention. FIG. 7 is a second diagram for explaining proposal 3-1 in an embodiment of the present invention. FIG. 8 is a diagram for explaining proposal 3-2 in an embodiment of the present invention. FIG. 9 is a diagram for explaining an example of the functional configuration of a base station 10 in an embodiment of the present invention. FIG. 10 is a diagram for explaining an example of the functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 11 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. 12 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 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] FIG. 3 is a diagram illustrating communication using LP-WUS and LP-WUR in an embodiment of the present invention. In 3GPP (registered trademark) Rel-18, a power consumption reduction technology called "Low-Power Wake Up Signal and Receiver" is under discussion. The low-power wake-up signal (LP-WUS) is referred to as LP-WUS or simply WUS, and the low-power wake-up signal receiver (LP-WUR, WUR, or LR) is referred to as LP-WUR, WUR, or LR. As shown in FIG. 3(a), a state called ultra-deep sleep (UDS) is introduced by operating the LR, a simplified circuit that operates with lower power consumption than the main radio (MR) used in normal data communications, as a replacement for the main radio (MR) used in normal data communications. As shown in FIG. 3(b), the LR may have a function that triggers the power-off or power-on of the MR when the LR receives an LP-WUS signal as shown in FIG. 3(a).

[0021] In addition, in 3GPP Rel-18, the following points are being discussed regarding LP-WUS / LP-WUR.

[0022] We design a LP-WUS that is commonly applicable to both IDLE / INACTIVE and CONNECTED modes. Here, we specify an OOK (OOK-1 and / or OOK-4)-based LP-WUS with an OFDM (Orthogonal Frequency Division Multiplexing) sequence overlaid on an OOK (On-Off Keying) symbol. The LP-WUS design shall ensure that the same information is delivered regardless of the LP-WUS type for IDLE / INACTIVE operation. The OFDM sequence shall also be capable of carrying information.

[0023] In IDLE / INACTIVE mode, an LP-SS with a periodicity (Y ms) of the LP-WUR is designated for serving cell synchronization and / or Radio Resource Management (RRM). The LP-SS shall be based on OOK-1 and / or OOK-4 waveforms with or without an overlaid OFDM sequence. An additional selection between with and without an overlaid OFDM sequence shall be made. Also, for LP-WURs that can receive the existing PSS / SSS, the existing PSS / SSS shall be used for synchronization and RRM instead of the LP-SS. The periodicity Y may be, for example, 320 ms.

[0024] Also, for LP-SS, it has been agreed that LP-WUS for idle mode and multi-beam operation for LP-SS will be supported.

[0025] 4 is a diagram for explaining SSB in an embodiment of the present invention. As shown in FIG. 4, in an SCS at 15 kHz, SSB resources are allocated to four OFDB symbols in the time direction.

[0026] (Example) An example will be described. In the example, a method for transmitting and receiving a synchronization signal for a low-power wakeup signal will be described. In addition, in this example, resource allocation of an LP-SS (low-power synchronization signal) will be described taking the following points into consideration.

[0027] (Point 1) Beam sweeping on both the base station 10 (gNB) and the LP-WUR receiver side: - For LP-WUR Tx beam sweeping, at least one LP-SS opportunity associated with one SSB is set (the best transmit (Tx) beam can be selected). - Multiple LP-SS opportunities associated with one SSB are useful for LP-WUR Rx beam tracking (the best receive (Rx) beam can be selected for FR2).

[0028] (Point 2) Resource allocation taking into account multiplexing using SSB - Allocate resources for LP-SS taking into account beam sweeping.

[0029] In this embodiment, the following three proposals will be described.

[0030] Proposal 1: LP-SS Opportunity Configuration Proposal 2: LP-SS Frequency Division Multiplexing (FDMed) Resource Mapping Using SSB Proposal 3: LP-SS Frequency Division Multiplexing (FDMed) Resource Mapping Regardless of SSB Position (Proposal 1) LP-SS Opportunity Configuration The base station 10 and terminal 20 may assume that N × K LP-SS opportunities may exist within one LP-SS period. Here, the LP-SS within one period may be transmitted using the same LP-SS configuration. Furthermore, an LP-SS opportunity may be referred to as a transmission opportunity by the base station 10 and as a reception opportunity by the terminal 20.

[0031] Here, N is the number of beams / SSBs with which the LP-SS is associated, and may be related, for example, via a Quasi Co-Location (QCL) assumption. The QCL assumption may be, for example, that the SSBs and the LP-SS can be at least one of QCLs {Type A, Type B, Type C, Type D}. That is, it is assumed that the cells are the same or different based on whether the carriers, bands, and frequency ranges (FRs) on which the SSBs and / or the LP-SSs are transmitted are the same or different.

[0032] K is the number of LP-SS for each beam / SSB.

[0033] Furthermore, the base station 10 and the terminal 20 may take repeated transmission into account and assume that one of the following LP-SS mapping approaches is used.

[0034] 5 is a diagram for explaining LP-SS in an embodiment of the present invention, showing an example of mapping of LP-SS according to Type A and Type B.

[0035] (Type A) First, map one LP-SS to every beam / SSB, and then use this mapping repeatedly, i.e., the (i × N + n)th LP-SS is associated with the nth SSB, where 0 <= n <= N, 0 <= i <= K.

[0036] (Type B) First, repeat the LP-SS mapping for the first beam / SSB, then repeat the LP-SS mapping for the next beam / SSB, i.e., the (n×K+i)th LP-SS is associated with the nth SSB, where 0<=n<=N, 0<=i<=K.

[0037] Furthermore, the base station 10 and the terminal 20 may set the above-mentioned values ​​of N and K and the LP-SS using system information / RRC / MAC CE / DCI.

[0038] The number N may be determined using at least one of the following methods: - Based on the SSBs actually transmitted - By setting the base station 10, for example by a bitmap display, a bit indicating "1" indicates that the corresponding SSB is set / selected.

[0039] Furthermore, the base station 10 may set the value of K in the range of 1 to Kmax, where Kmax is the maximum number of LP-SSs (Kmax) defined for one beam / SSB.

[0040] The base station 10 and the terminal 20 may assume that the LP-SS configuration includes at least one of the following: Number of resource blocks (RBs) of the LP-SS Subcarrier spacing (SCS) Waveform type (e.g., OOK-1 or OOK-4, where another value M may be set when OOK-4 is configured) ON-OFF pattern / binary sequence for the OOK waveform in one LP-SS Duration for one LP-SS in OFDM symbols Information on the repeated transmission method of the LP-SS, which will be described later Overlay sequence configuration LP-SS transmission period Furthermore, the base station 10 and the terminal 20 may assume that the LP-SS opportunity configuration is the same or different between the RRC idle / inactive mode and the connected mode.

[0041] The base station 10 and the terminal 20 may assume that at least one of the following methods is used when an LP-SS transmission opportunity overlaps with an uplink (UL) symbol / slot, where overlapping refers to, for example, overlapping of at least one of time resources and frequency resources.

[0042] Alt.1-1: Overlapping LP-SS opportunities shall not be available for LP-SS transmission.

[0043] Alt. 1-2: Overlapping LP-SS opportunities may be used for LP-SS transmission.

[0044] Alt. 1-3: Terminal 20 does not assume that LP-SS opportunities overlap with UL symbols / slots.

[0045] In Alt.1-1 to Alt.1-3, the same method may be applied to different UL transmissions, or different methods may be applied. For example, Alt.1-2 may be applied to an UL configured with SR / PRACH / CG-PUSCH, etc., and Alt.1-3 may be applied to a scheduled / triggered UL such as PUSCH / PUCCH / SRS.

[0046] In addition, the base station 10 and terminal 20 may assume that when an LP-SS transmission opportunity overlaps with another NR DL signal or channel, at least one of the following methods is used.

[0047] Alt.2-1: Another NR downlink (DL) signal or channel is transmitted. The terminal 20 is assumed to receive this signal. Here, LP-SS is not transmitted.

[0048] Alt. 2-2: LP-SS is transmitted, and terminal 20 is expected to receive the LP-SS, and no other NR DL signals or channels are transmitted.

[0049] Alt. 2-3: It is assumed that both LP-SS and other NR signals or channels are transmitted, and that terminal 20 receives at least one of the transmitted LP-SS and other NR signals or channels.

[0050] Alt. 2-4: The terminal 20 does not assume that the LP-SS opportunity overlaps with other NR DL signals or channels.

[0051] The same method may be applied to different NR DL transmissions in Alt.2-1 to Alt.2-4, or different methods may be applied. For example, Alt.2-1 may be applied to DLs consisting of PDCCH / SPS-PDSCH / TRS, etc., and Alt.2-3 may be applied to scheduled / triggered DLs such as PDSCH / AP-CSI-RS.

[0052] The terminal 20 may determine which of the above methods is available based on the LP-SS settings or on instructions received from the base station 10. For example, the terminal 20 assumes that Alt. 2-3 is used for OOK-1 or OOK-4 with M=1, and that overlapped transmission is possible. Also, for example, the terminal 20 assumes that Alt. 2-1 or Alt. 2-2 is used for OOK-4 with M>1, and that overlapped transmission is not possible.

[0053] That is, when an LP-SS opportunity overlaps with an uplink signal or a downlink signal other than a low-power synchronization signal, the base station 10 and the terminal 20 may determine whether to not allow reception of the overlapping low-power synchronization signal, to allow reception of the overlapping low-power synchronization signal, or to not assume the overlap, and notify the terminal 20. The terminal 20 may make this determination based on the notification received from the base station 10.

[0054] (Proposal 2) Resource Mapping for LP-SS Frequency Division Multiplexing (FDMed) Using SSB FIG. 6 is a diagram for explaining Proposal 2 shown below in an embodiment of the present invention.

[0055] The base station 10 and the terminal 20 may assume that one LP-SS is allocated or partially allocated to an OFDM symbol of an associated SSB (synchronization signal block).

[0056] The terminal 20 may receive, for example, from the base station 10, an instruction regarding at least one of the following regarding LP-SS mapping: - An index (i.e., information regarding the starting position) of at least one SSB period / slot / subframe / radio frame within the LP-SS period at which LP-SS mapping starts - A time offset between the start of the LP-SS and the start of the associated SSB (for example, the offset is indicated, for example, by the number of symbols; the offset value may be 0) Within the LP-SS period, the terminal 20 may assume that LP-SS mapping starts from a time position based on the instruction from the base station 10 and continues until all configured LP-SSs have been mapped.

[0057] The base station 10 and terminal 20 may assume that, as a repetition of LP-SS type A, they first map the repetitive LP-SS to all beams / SSBs, and then perform subsequent repetitions of LP-SS.

[0058] Alt. 1: The subsequent LP-SS repetitions are mapped in the next SSB period using the same mapping rule as the first repetition, where the subsequent LP-SS repetitions may be frequency division multiplexed (FDMed) with the associated SSB.

[0059] Alt. 2: The subsequent LP-SS repetition is mapped in the next slot / subframe at the same LP-SS position as the first repetition, where the subsequent LP-SS repetition may not be frequency division multiplexed (FDMed) with the associated SSB (because there is no associated SSB at that time position).

[0060] The base station 10 and the terminal 20 may assume that, as a repetition of LP-SS type B, the repeated LP-SS is mapped within one associated SSB.

[0061] The base station 10 and terminal 20 may also assume that Type B repetition is used when the duration of the LP-SS is very short, for example, one or two OFDM symbols.

[0062] The base station 10 and the terminal 20 may also assume that there are K time offsets when there are K repetitions of LP-SS, and that for each repetition of LP-SS, a corresponding time offset is used for mapping.

[0063] (Proposal 3) Resource mapping for LP-SS frequency division multiplexing (FDMed) regardless of SSB position (Proposal 3-1) Figure 7 is the first diagram for explaining Proposal 3-1 shown below in an embodiment of the present invention.

[0064] The base station 10 and the terminal 20 may assume that the LP-SS is mapped to the OFDM symbols using a mapping pattern. Different patterns may be used depending on the duration of the LP-SS. For example, if the duration of the LP-SS is not greater than 14 OFDM symbols, one or more LP-SSs may be mapped to one slot. For example, one or more LP-SSs may be mapped to multiple slots. For example, the LP-SS may be mapped to consecutive OFDM symbols.

[0065] The terminal 20 may receive at least one of the following instructions regarding LP-SS mapping, for example, from the base station 10: - For example, the terminal 20 may be instructed of at least one index of a symbol / slot / subframe / radio frame within an LP-SS period at which LP-SS mapping starts. - For example, when there are multiple mapping patterns, the terminal 20 may be instructed of the LP-SS mapping pattern to be used.

[0066] Within the LP-SS period, the terminal 20 may assume that LP-SS mapping starts from a time position based on the instruction of the base station 10 and continues until all configured LP-SSs have been mapped.

[0067] FIG. 8 is a second diagram for explaining Proposal 3-1 shown below in the embodiment of the present invention.

[0068] The base station 10 and the terminal 20 may assume the following behavior when LP-SS is not transmitted in an LP-SS opportunity due to a collision with resources of other signals, etc. (the resources are not available).

[0069] Alt. 1: The LP-SS is skipped (aborted), i.e., not transmitted. The terminal 20 does not monitor or receive the LP-SS.

[0070] Alt. 2: The LP-SS is mapped to the latest available opportunity, i.e., the LP-SS is transmitted at the next opportunity. The terminal 20 performs monitoring and reception of the LP-SS at the next opportunity.

[0071] (Proposal 3-2) FIG. 9 is a diagram for explaining Proposal 3-2 shown below in the embodiment of the present invention.

[0072] The base station 10 and the terminal 20 may assume that the LP-SS is mapped to available OFDM symbols without using a mapping pattern.

[0073] As an instruction regarding LP-SS mapping, the terminal 20 may receive, for example, from the base station 10, an index of at least one of an OFDM symbol / slot / subframe / SSB period / radio frame within the LP-SS period at which LP-SS mapping starts.

[0074] For example, the LP-SS mapping may start from the mth OFDM symbol of the nth slot in the LP-SS period.

[0075] Within the LP-SS period, the terminal 20 may assume that LP-SS mapping starts from a time position based on the instruction of the base station 10 and continues until all configured LP-SSs have been mapped.

[0076] The base station 10 and the terminal 20 may assume that the following method is used as the LP-SS mapping method.

[0077] Alt. 1: Contiguous mapping, i.e. LP-SS is only mapped onto consecutive OFDM symbols in time.

[0078] Also, for example, if the duration of consecutive available OFDM symbols is shorter than the duration of the LP-SS, then the consecutive OFDM symbols may not be used for LP-SS mapping. Figure 9 shows, as Alt. 1, that if five or more consecutive symbols cannot be reserved, the resources for those symbols are not used.

[0079] Alternative 2: Both contiguous and non-contiguous mapping. For example, the LP-SS may be mapped to non-contiguous OFDM symbols. Also, for example, in the case of non-contiguous mapping, the gap between two adjacent segments of one LP-SS may not exceed one period, e.g., n OFDM symbols. Figure 9 shows, as Alternative 2, that resources for non-contiguous symbols are used for one LP-SS (LP-SS#4).

[0080] The above-described embodiment clarifies a method for transmitting and receiving a synchronization signal for a low-power wakeup signal in a wireless communication system.

[0081] (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.

[0082] <Base Station 10> Fig. 10 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. 10, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 10 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations according to the embodiment of the present invention.

[0083] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signal. 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.

[0084] 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, setting information related to a synchronization signal for a low-power wakeup signal.

[0085] As described in the embodiment, the control unit 140 controls the synchronization signal of the low-power wakeup signal. The function unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the function unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

[0086] <Terminal 20> Fig. 11 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. 11, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 11 is merely an example. 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.

[0087] 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 the low-power wake-up signal from the base station 10. The configuration unit 230 stores various configuration information received by the receiver 220 from the base station 10. The configuration unit 230 also stores pre-configured configuration information. The configuration information includes, for example, configuration information related to a synchronization signal for the low-power wake-up signal.

[0088] As described in the embodiment, the control unit 240 performs settings related to the synchronization signal of 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.

[0089] (Hardware Configuration) The block diagrams (FIGS. 10 and 11) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0090] 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.

[0091] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 10 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 11 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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).

[0100] 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.

[0101] 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.

[0102] Fig. 13 shows an example configuration of a vehicle 2001. As shown in Fig. 13, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0103] 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.

[0104] 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).

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] <Configuration related to this embodiment> (Item 1) A terminal having: a control unit that determines a reception opportunity for a low power synchronization signal based on the number of beams associated with a low power synchronization signal and the number of low power synchronization signals for each beam, within a transmission period of the low power synchronization signal; and a receiving unit that receives the low power synchronization signal at the reception opportunity, wherein, when the reception opportunity overlaps with an uplink signal or a downlink signal other than the low power synchronization signal, the control unit determines whether to not allow reception of the overlapping low power synchronization signal, allow reception of the overlapping low power synchronization signal, or not assume the overlap. (Item 2) The terminal according to Supplementary Item 1, wherein the control unit assumes that at least a part of the low power synchronization signal is arranged in a symbol in an associated synchronization signal block, and the receiving unit receives information regarding a start position at which the low power synchronization signal is mapped from a base station, within the transmission period of the low power synchronization signal. (Clause 3) The terminal according to Supplementary clause 1, wherein the receiving unit receives information regarding mapping of the low power synchronization signal from a base station, the information being determined based on a duration of the low power synchronization signal, and the control unit assumes, when a resource for a reception opportunity of the low power synchronization signal is unavailable, to stop receiving the low power synchronization signal, or to receive the low power synchronization signal at the next reception opportunity. (Clause 4) The terminal according to Supplementary clause 1, wherein the control unit assumes that the resource for the low power synchronization signal is mapped to temporally consecutive symbols without using a mapping pattern. (Clause 5) A base station comprising: a control unit that determines a transmission opportunity for the low power synchronization signal based on the number of beams associated with the low power synchronization signal and the number of low power synchronization signals for each beam within a transmission period of the low power synchronization signal; and a transmitting unit that transmits the low power synchronization signal at the transmission opportunity, wherein the control unit determines, with regard to overlapping of the transmission opportunity with an uplink signal or a downlink signal other than the low power synchronization signal, whether to allow the overlap, not to allow the overlap, or not to assume the overlap.(Clause 6) A communication method executed by a terminal, comprising: a step of determining a reception opportunity for a low power synchronization signal based on the number of beams associated with the low power synchronization signal and the number of low power synchronization signals for each beam within a transmission period of the low power synchronization signal; a step of receiving the low power synchronization signal at the reception opportunity; and a step of determining whether to not allow reception of the overlapping low power synchronization signal, allow reception of the overlapping low power synchronization signal, or not assume the overlap when the reception opportunity overlaps with an uplink signal or a downlink signal other than the low power synchronization signal.

[0113] Any of the above-described embodiments can clarify the method for transmitting and receiving a synchronization signal for a low-power wakeup signal in a wireless communication system.

[0114] (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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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).

[0119] 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.

[0120] 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.

[0121] 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).

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0140] 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."

[0141] 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.

[0142] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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."

[0162] 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.

[0163] 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.

[0164] 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."

[0165] 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).

[0166] 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.

[0167] This patent application claims priority based on Japanese Patent Application No. 2024-082176 filed on May 20, 2024, the entire contents of which are incorporated herein by reference.

[0168] 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 control unit that determines a reception opportunity for a low power synchronization signal based on the number of beams associated with a low power synchronization signal and the number of low power synchronization signals per beam within a transmission period of the low power synchronization signal, and a receiving unit that receives the low power synchronization signal at the reception opportunity, wherein the control unit determines whether to not allow reception of the overlapping low power synchronization signal, allow reception of the overlapping low power synchronization signal, or not assume the overlap when the reception opportunity overlaps with an uplink signal or a downlink signal other than the low power synchronization signal.

2. The terminal according to claim 1, wherein the control unit assumes that at least a portion of the low-power synchronization signal is placed in a symbol in an associated synchronization signal block, and the receiving unit receives information from a base station regarding a start position at which the low-power synchronization signal is mapped within a transmission period of the low-power synchronization signal.

3. The terminal according to claim 1, wherein the receiving unit receives information from a base station regarding mapping of the low-power synchronization signal determined based on the duration of the low-power synchronization signal, and the control unit assumes that if resources for a reception opportunity for the low-power synchronization signal are not available, reception of the low-power synchronization signal will be discontinued, or that reception of the low-power synchronization signal will be assumed at the next reception opportunity.

4. The terminal according to claim 1, wherein the control unit assumes that resources of the low-power synchronization signal are mapped to temporally consecutive symbols without using a mapping pattern.

5. A base station comprising: a control unit that determines a transmission opportunity for a low-power synchronization signal based on the number of beams associated with a low-power synchronization signal and the number of low-power synchronization signals per beam within a transmission period of the low-power synchronization signal; and a transmission unit that transmits the low-power synchronization signal at the transmission opportunity, wherein the control unit determines whether to allow overlap between the transmission opportunity and an uplink signal or a downlink signal other than the low-power synchronization signal, to not allow overlap, or to not assume overlap.

6. A communication method executed by a terminal, comprising the steps of: determining a reception opportunity for a low power synchronization signal based on the number of beams associated with the low power synchronization signal and the number of low power synchronization signals per beam within a transmission period of the low power synchronization signal; receiving the low power synchronization signal at the reception opportunity; and, when the reception opportunity overlaps with an uplink signal or a downlink signal other than the low power synchronization signal, determining whether to not allow reception of the overlapping low power synchronization signal, allow reception of the overlapping low power synchronization signal, or not assume the overlap.

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