Terminal, base station, and communication method

Abstract

This terminal includes a control unit and a reception unit. When a time position and / or a frequency position is set for a normal synchronization signal that can also be used for signals other than a low-power wake-up signal, a synchronization signal of the low-power wake-up signal, a preamble of the low-power wake-up signal, and the low-power wake-up signal, the control unit assumes skipping monitoring of the synchronization signal of the low-power wake-up signal and / or the preamble of the low-power wake-up signal, and the reception unit detects and receives the low-power wake-up signal.

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 V18.1.0 (2024-03) 3GPP TS 38.401 V18.1.0 (2024-03)

[0004] In 3GPP Rel-19, an ultra-low power 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). It is desirable to use a receiver configuration with as low power consumption as possible in LP-WUS / WUR. To achieve this, Rel-19 will introduce LP-WUS as a new low-power reduction function. Furthermore, the possibility of LP-WUR being used in both cases where the synchronization signal specified in the existing NR cannot be received and where it can be received is being considered. A simple synchronization signal (LP-SS (Synchronization Signal)) for LP-WUS is planned to be introduced with the aim of providing time and frequency synchronization functions even when the synchronization signal specified in the existing NR cannot be received. In addition, in order to suppress the increase in radio resource overhead caused by the frequent transmission of the periodic signal LP-SS, it is also being discussed to configure a preamble signal as part of the LP-WUS (LP-WUS preamble signal). On the other hand, assuming that a synchronization signal specified in the existing NR can be received, it is also assumed that a configuration using all of the LP-SS, LP-WUS preamble, and normal synchronization signal (for example, NR-SSB ((SS / PBCH block)))) is designed for transmission and reception of the LP-WUS.

[0005] However, in LP-WUS transmission and reception, which aims to reduce power consumption, it is necessary to avoid inefficiencies such as overhead and duplication of functions caused by receiving multiple types of synchronization signals.

[0006] The present invention has been made in view of the above points, and has as its object to efficiently transmit and receive a synchronization signal of a low-power wake-up signal (LP-WUS) in a wireless communication system.

[0007] According to the disclosed technology, a terminal is provided that has a control unit that assumes skipping of monitoring at least one of a normal synchronization signal that is also used for signals other than low power wake-up signals, the synchronization signal of the low power wake-up signal, the preamble of the low power wake-up signal, and the low power wake-up signal when at least one of a time position and a frequency position is set for the synchronization signal of the low power wake-up signal, the preamble of the low power wake-up signal, and the low power wake-up signal, and a receiving unit that detects and receives the low power wake-up signal.

[0008] According to the disclosed technology, it is possible to efficiently transmit and receive a synchronization signal of a low-power wake-up signal (LP-WUS) in a wireless communication system.

[0009] FIG. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. FIG. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. FIG. 2 is a diagram for explaining communication by an LP-WUS and an LP-WUR according to an embodiment of the present invention. FIG. 3 is a diagram for explaining communication by an LP-WUS and an LP-WUR according to an embodiment of the present invention. FIG. 4 is a diagram for explaining an example of the configuration of an LP-SS and an LP-WUS. FIG. 5 is a diagram for explaining a method of transmitting an LP-WUS according to an embodiment of the present invention. FIG. 6 is a diagram for explaining a method of transmitting an LP-WUS according to an embodiment of the present invention. FIG. 7 is a diagram for explaining a method of transmitting an LP-WUS according to an embodiment of the present invention. FIG. 8 is a diagram for explaining a method of transmitting an LP-WUS according to an embodiment of the present invention. FIG. 9 is a diagram for explaining a method of transmitting an LP-WUS according to an embodiment of the present invention. FIG. 10 is a diagram for explaining a method of transmitting an LP-WUS according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of the configuration of a vehicle 2001 according to an embodiment of the present invention.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.).

[0014] 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.

[0015] 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.

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

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

[0018] 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.

[0019] 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.

[0020] 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.

[0021] FIG. 3 is a diagram illustrating communication by LP-WUS and LP-WUR in an embodiment of the present invention. In 3GPP (registered trademark) Rel-19, a power consumption reduction technology called "Low-Power Wake Up Signal and Receiver" is under discussion. The low-power wake-up signal (Low-Power Wake Up Signal) is referred to as LP-WUS or simply WUS, and the low-power wake-up signal receiver (Low-Power Wake Up Receiver) 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. Furthermore, as shown in FIG. 3(a) or 3(b), the power of the MR may be turned off or on when the LR receives an LP-WUS signal. In this way, the low power wake-up signal (LP-WUS) can also be said to be a control signal used to switch the state of the MR. Switching the state of the MR may be, for example, switching the power ON or OFF, or switching between the ON state and the sleep state. Alternatively, the low power wake-up signal (LP-WUS) can also be said to be a signal indicating whether or not to monitor a PO (Paging Occasion) (whether or not paging is being sent to the own terminal), as described in FIG. 4. Furthermore, the low power wake-up signal (LP-WUS) may be a predetermined sequence, or may be information included in DCI (for example, PEI (Paging Early Indication)).

[0022] FIG. 4 is a diagram for explaining communication by the LP-WUS and the LP-WUR in an embodiment of the present invention. In 3GPP, the functional details of the application method are under discussion for the RRC connection state in all cases of RRC CONNECTED, IDLE, and INACTIVE. It is under consideration to use the LP-WUS for the CONNECTED state to indicate PDCCH monitoring following the LP-WUS, and for IDLE / INACTIVE to indicate Paging PDCCH monitoring following the LP-WUS. As shown in FIG. 4, for example, in RRC IDLE, the LP-WUS is transmitted as information indicating whether the PO should be monitored. Furthermore, when the LR receives the LP-WUS and determines that the PO should be monitored, the MR is activated and the subsequent processing is performed.

[0023] 3GPP also introduces an additional reference signal called the low-power synchronization signal (LP-SS) to enable synchronization processing / Radio Resource Management (RRM) measurements in LP-WUR. Here, when LP-WUR is deployed with OFDM-based receivers, it is possible to reuse the existing NR-SSB. However, since LP-WUR may be designed based on non-OFDM with a simple configuration, it is necessary to specify a non-OFDM-based synchronization signal as well.

[0024] Considering that LP-SS is responsible for synchronization and RRM measurement, it should be defined as an always-on periodic signal. Furthermore, to minimize network overhead, the frequency of LP-SS transmission should be minimized. Furthermore, if the LP-SS transmission frequency is low, it is expected that a certain amount of time will be required between the LP-SS-based synchronization process and the LP-WUS reception process, which may result in significant time and frequency drift errors during LP-WUS reception. Therefore, an additional signal for accurate time and frequency synchronization may be specified as the LP-WUS preamble signal.

[0025] The LP-WUS may include an LP-WUS preamble that assists the terminal synchronization process described above. The portion of the LP-WUS other than the LP-WUS preamble is used for data transmission, including a wake-up instruction for the MR, and may be referred to as the LP-WUS payload. Either the LP-WUS payload or the LP-WUS preamble may simply be referred to as the LP-WUS. The LP-WUS payload may consist of one part or multiple parts. The LP-WUS may also include both the LP-WUS preamble and the LP-WUS payload. The LP-WUS payload may be referred to as the LP-WUS payload, and the LP-WUS preamble may be referred to as the LP-WUS preamble. Figure 5 illustrates an example of the configuration of an LP-SS and an LP-WUS.

[0026] Configuration example 1 shows a configuration with periodic LL-SS and on-demand LP-WUS payloads.

[0027] Configuration example 2 shows a configuration with periodic LL-SS, an on-demand LP-WUS preamble, and an on-demand LP-WUS payload.

[0028] Configuration example 3 shows a configuration with periodic LL-SS and periodic LP-WUS payloads.

[0029] Configuration example 4 shows a configuration with a periodic LL-SS, a periodic LP-WUS preamble, and a periodic LP-WUS payload.

[0030] Furthermore, as the binary LP-SS sequence type of the "on-off" pattern in LP-SS, a Gold sequence, an M sequence, a sequence automatically generated by a computer, or the like may be used. The length of the LP-SS sequence may also be defined or set. In this way, the LP-SS may be any predetermined sequence, and may also be referred to as a reference signal, a synchronization signal, or the like.

[0031] To define the LP-WUS monitoring operation, the time / frequency position, period, or index of the monitoring operation may be defined. Furthermore, multiple types of monitoring occasions may be defined for this definition. For example, two types, LP-WUS occasion (LO) and monitoring occasion (MO), may be defined. Here, each LO may have one or more LP-WUS monitoring occasions (MOs). The terminal 20 may be instructed to monitor one or more LOs and may monitor one or more MOs included in the instructed LO. The low-power wake-up signal (LP-WUS) may be defined as one of the physical signals or may be information included in the DCI. Different MOs may correspond to different beams in multi-beam operation. An LO may be defined as a time window covering the time or frequency position of the corresponding MO. Alternatively, the time / frequency positions of the LO / MO may be defined separately, and a mapping between the LO and the MOs included therein may be defined. LO can also be said to be a period for monitoring signals related to LP-WUS (hereinafter referred to as "LP-WUS related signals", for example, at least one of LP-SS, LP-WUS preamble, and LP-WUS payload).

[0032] The LP-SS should be designed to simplify the configuration of the LP-WUR. For example, periodic continuous transmission of the LP-SS may increase network overhead.

[0033] For time / frequency synchronization in LP-WUR, NR-SSB, LP-SS, and LP-WUS preambles may be used, but it should be noted that all or part of the preamble transmissions provide redundant functions such as synchronization and reference signals for RRM measurements, and consideration should be given to avoiding unnecessary redundancy and optimizing overall system performance.

[0034] Hereinafter, a method for efficiently transmitting and receiving synchronization signals for low power wakeup signals (LP-WUS) in a wireless communication system will be described.

[0035] (Method 1) The terminal 20 and the base station 10 may assume that the LP-SS / LP-WUS configuration is determined based on the relationship between the NR SSB, LP-SS, and / or LP-WUS. Here, the LP-WUS configuration may include the following factors. Hereinafter, the time positions of the NR SSB, LP-SS, and LP-WUS may be the first positions unless otherwise specified. Whether or not an LP-SS / LP-WUS exists at a specific time / frequency position, and the position where it exists; LP-SS / LP-WUS resource allocation; and LP-SS / LP-WUS signal design and structure.

[0036] The terminal 20 and the base station 10 may assume that the relationship between the NR SSB, LP-SS, and / or LP-WUS includes the following factors: resource configuration, BWPs configured to be located at the NR SSB, LP-SS, and / or LP-WUS, repeated transmissions, and associated time / frequency locations between the NR SSB, LP-SS, and / or LP-WUS.

[0037] For example, the terminal 20 and the base station 10 may assume that the LP-SS / LP-WUS configuration is determined based on the presence of a normal synchronization signal (NR SSB) that is not a synchronization signal (LP-SS) for the LP-WUS. For example, the terminal 20 and the base station 10 may determine whether or not an LP-SS / LP-WUS exists at a specific time / frequency location based on the NR SSB, LP-SS, and / or LP-WUS configured in the bandwidth portion (BWP).

[0038] (Example 1) FIG. 6 is a diagram illustrating a method for transmitting an LP-WUS according to an embodiment of the present invention. As shown in FIG. 6, when multiple BWPs are configured, the position of the NR SSB is configured in a first BWP (Initial active DL BWP). Based on the position of the NR SSB, the positions of, for example, the LP-SS, LP-WUS preamble, and LP-WUS (LP-WUS payload indicates a low-power wakeup signal (LP-WUS), and the same applies hereinafter) may be configured in a second BWP. Here, for example, the position of the LP-SS may be configured to be the same as the position of the NR SSB. In this way, a BWP (e.g., a second BWP) in which an LP-WUS-related signal is transmitted may be configured in the UE, separate from the initial BWP in which the NR-SS is transmitted. Here, the LP-WUS-related signal is a signal related to the LP-WUS, and may include, for example, at least one of the LP-SS, the LP-WUS preamble, and the LP-WUS payload.

[0039] On the other hand, when the positions of the NR SSB, LP-SS, LP-WUS preamble, and LP-WUS are set in a single BWP (initial active DL BWP), monitoring of the LP-WUS payload may be performed based on synchronization processing by the NR SSB. Therefore, transmission by the base station 10 and monitoring by the terminal 20 may be skipped for the LP-SS and LP-WUS preamble. In this way, NR-SSS and LP-WUS related signals may be transmitted within the initial BWP.

[0040] (Example 2) Figure 7 is a diagram illustrating a method for transmitting LP-WUS in an embodiment of the present invention. As shown in Figure 7, the time offset X between the normal synchronization signal (NR SSB) and the LP-WUS-related signal (e.g., at least one of LP-SS, LP-WUS preamble, and LP-WUS payload) may be set large as shown in Example 1, or may be set small (including 0) as shown in Example 2. Here, taking into consideration overlapping of synchronization functions, for example, when the value of X is smaller than a threshold, the base station 10 may skip transmission of the normal synchronization signal (NR SSB) and some signals (e.g., the LP-WUS preamble) among the LP-WUS-related signal, and the terminal 20 may skip monitoring of them. Furthermore, a large time offset X may mean that the time offset X has a value such that at least a portion of the NR SSB and the LP-WUS-related signal do not overlap (e.g., an offset value greater than the time length of the NR-SSB). Alternatively, a large time offset X may mean that, when multiple candidate values ​​for X are prepared, one or more candidate values ​​for larger X are set, or that X is greater than a certain threshold. A small time offset X may mean that the time offset X has a value that causes at least a portion of the NR SSB and the LP-WUS-related signal to overlap (e.g., an offset value smaller than the time length of the NR-SSB). Alternatively, a small time offset X may mean that, when multiple candidate values ​​for X are prepared, one or more candidate values ​​for smaller X are set, or that X is smaller than a certain threshold.

[0041] (Example 3) FIG. 8 is a diagram illustrating a LP-WUS transmission method according to an embodiment of the present invention. As illustrated in FIG. 8, the frequency offset X between the normal synchronization signal (NR SSB) and the LP-WUS-related signal (e.g., at least one of the LP-SS, LP-WUS preamble, and LP-WUS payload) and the monitoring frequency band Y of the LP-WUS-related signal may be set large as shown in Example 1, or small as shown in Example 2. Here, taking into consideration overlapping of synchronization functions, for example, based on the values ​​of X and Y, the base station 10 may skip transmission of some signals (e.g., the LP-WUS preamble) in the normal synchronization signal (NR SSB) and the LP-WUS-related signal, and the terminal 20 may skip monitoring of them. For example, the skip may be performed when the value of X is smaller than a threshold. Alternatively, the skip may be performed when the value of Y is smaller than a threshold. Alternatively, the skip may be performed when X is smaller than Y. The threshold may also be the bandwidth that the terminal 20 / LP-WUS can monitor. Furthermore, a large frequency offset X may mean that the frequency offset X has a value such that at least a portion of the NR SSB and the LP-WUS-related signal do not overlap (e.g., an offset value larger than the frequency width of the NR-SSB). Alternatively, a large frequency offset X may mean that, when multiple candidate values ​​for X are prepared, one or more candidate values ​​for a larger X are set, or that X is greater than a certain threshold. Furthermore, a small frequency offset X may mean that the frequency offset X has a value such that at least a portion of the NR SSB and the LP-WUS-related signal overlap (e.g., an offset value smaller than the frequency width of the NR-SSB). Alternatively, a small frequency offset X may mean that, when multiple candidate values ​​for X are prepared, one or more candidate values ​​for a smaller X are set, or that X is smaller than a certain threshold.

[0042] (Variation 1) For example, the reference point in the offset in the time / frequency domain described in the second and third embodiments may be, for example, as follows: The reference point is fixed. For example, the NR SSB may be the reference point. The reference point may be a preceding signal or a succeeding signal in the time / frequency domain. For example, as shown in FIG. 7, the time offset may be the time between the NR SSB, which is the reference point, and the LP-SS, which is the succeeding signal.

[0043] Alternatively, multiple reference points may be defined in the specifications, and the base station 10 may set one selected from the multiple reference points.

[0044] (Variation 2) One or more combinations may be defined for signals monitored by the terminal 20 (or transmitted by the base station 10). The combinations may be, for example, Combination 1: NR SSB, LP-SS, LP-WUS preamble, and LP-WUS; Combination 2: LP-SS, LP-WUS preamble, and LP-WUS; Combination 3: NR SSB, LP-WUS preamble, and LP-WUS.

[0045] Based on the combination, the terminal 20 may determine which signals to monitor and receive and which signals to skip monitoring. For example, when the above-described combination 1 is set, the terminal 20 may determine to skip monitoring the LP-SS.

[0046] Furthermore, the base station 10 may determine which signals to transmit and which signals to skip transmitting based on the combination.

[0047] (Example 4) FIG. 9 is a diagram illustrating a method for transmitting an LP-WUS according to an embodiment of the present invention. As in the case illustrated in FIG. 6, the time / frequency locations of some or all of the NR SSB, LP-SS, LP-WUS preamble, and LP-WUS payload are configured using multiple BWPs or a single BWP. Here, when a single BWP is configured, the LP-SS size and the LP-WUS size may be configured as time / frequency resource sizes different from those when multiple BWPs are configured, taking into consideration that the NR SSB can be reused for LP-WUS synchronization processing / RRM measurement. For example, smaller sizes may be configured by removing functions from the LP-SS and LP-WUS that overlap with the NR SSB. Furthermore, the time / frequency offset described in Examples 2 and 3 may be applied to Example 4.

[0048] (Example 5) The terminal 20 and the base station 10 may assume that the configuration of the LP-WUS related signal (e.g., at least one of the LP-SS, the LP-WUS preamble, and the LP-WUS payload) is determined based on the relationship between the LP-SS and the LP-WUS.

[0049] 10 is a diagram illustrating a method for transmitting an LP-WUS according to an embodiment of the present invention. As shown in FIG. 10, when multiple BWPs are configured, the location of the LP-SS is configured in a first BWP (Initial active DL BWP). Based on the location of the LP-SS, the locations of, for example, the LP-WUS preamble and LP-WUS payload may be configured in a second BWP. Here, for example, the location of the LP-WUS preamble may be configured to be the same as the location of the LP-SS.

[0050] On the other hand, when the LP-SS, LP-WUS preamble, and LP-WUS positions are set in a single BWP (initial active DL BWP), monitoring of the LP-WUS payload may be performed based on synchronization processing by the LP-WUS. Therefore, the base station 10 may skip transmission of the LP-WUS preamble, and the terminal 20 may skip monitoring of the LP-WUS preamble.

[0051] (Variation 3) When the configuration of the LP-WUS-related signals is determined based on the relationship between signals such as the NR SSB, LP-SS, LP-WUS preamble, and LP-WUS payload, the terminal 20 and the base station 10 may assume that some signals will be combined (merged) with other signals. Furthermore, the terminal may assume that this process is applied only when all LP-WUS-related signals to be merged are included in a single BWP.

[0052] 11 is a diagram illustrating a method for transmitting an LP-WUS according to an embodiment of the present invention. As shown in FIG. 11, when multiple BWPs are configured, the location of the LP-SS is set in a first BWP (Initial active DL BWP). Based on the location of the LP-SS, the locations of, for example, the LP-WUS preamble and LP-WUS payload may be set in a second BWP. Here, for example, the location of the LP-WUS preamble may be set to be the same as the location of the LP-SS.

[0053] On the other hand, in a single BWP (initial active DL BWP), a modified LP-SS that merges the LP-WUS and the LP-WUS preamble may be deployed in the position of the LP-SS. Also, modified values ​​of the sequence length, time / frequency resource size, and other parameters of the original LP-WUS may be set for the modified LP-SS. The modified LP-SS may also be called a modified LP-WUS preamble.

[0054] (Method 1a) For example, the same signal may be repeatedly transmitted to prevent failure of transmission and reception due to quality degradation in the wireless section. When LP-WUS related signals (for example, at least one of LP-SS, LP-WUS preamble, and LP-WUS payload) are repeatedly transmitted, the terminal 20 and the base station 10 may assume that some signals will be skipped, for example, based on the method described in the above embodiment or modification.

[0055] Fig. 12 is a diagram showing a method for transmitting LP-WUS in an embodiment of the present invention. As shown in Fig. 12, when there is no skip, the LP-SS, LP-WUS preamble, and LP-WUS payload are all transmitted. In contrast to the case when there is no skip, in Example 1, all LP-WUS preambles are skipped. In Example 2, some LP-WUS preambles are skipped. In Example 3, all LP-WUS preambles are skipped, and the LP-WUS payload is transmitted continuously, leaving no positions for the skipped LP-WUS preambles.

[0056] Fig. 13 is a diagram showing a method for transmitting LP-WUS in an embodiment of the present invention. As shown in Fig. 13, when no skipping is performed, all LP-WUS preambles and LP-WUS payloads are transmitted. In contrast to the case when no skipping is performed, in Example 1, all LP-WUS preambles other than the first LP-WUS preamble are skipped. In Example 2, some LP-WUS preambles other than the first LP-WUS preamble are skipped. In Example 3, all LP-WUS preambles other than the first LP-WUS preamble are skipped, and the LP-WUS payloads are transmitted continuously, leaving no space for the skipped LP-WUS preambles.

[0057] FIG. 14 is a diagram relating to an LP-WUS transmission method according to an embodiment of the present invention. As shown in FIG. 14, the transmission example described in FIG. 12 and the transmission example described in FIG. 13 may be combined. In the case of no skipping, the LP-SS, LP-WUS preamble, and LP-WUS payload are all transmitted, and then the LP-WUS preamble and LP-WUS payload are all transmitted. In contrast to the case of no skipping, in Example 1, all LP-WUS preambles are skipped. In Example 2, some LP-WUS preambles are skipped. In Example 3, all LP-WUS preambles are skipped, and the LP-WUS payloads are transmitted continuously, leaving no positions for the skipped LP-WUS preambles.

[0058] (Method 2) When multiple types of signals for synchronization processing / RRM measurement are monitored by the terminal 20, the terminal 20 and the base station 10 may assume that the priorities of the signals are defined or set.

[0059] As a first example, a priority of monitoring by terminal 20 may be defined. For example, when terminal 20 has the capability and / or opportunity to monitor NR SSB, LP-SS, and / or LP-WUS preambles, terminal 20 may prioritize monitoring NR SSB. Alternatively, terminal 20 may receive at least one of NR SSB, LP-SS, and LP-WUS preambles based on the priority.

[0060] As a second example, a priority may be defined for signals transmitted by the base station 10. For example, when there is a conflict between an NR SSB and an LP-SS with respect to time / frequency resources, the base station 10 may prioritize transmitting an NR SSB within the conflicting time / frequency resources.

[0061] According to the above-described embodiment, a synchronization signal of a low-power wake-up signal (LP-WUS) can be efficiently transmitted and received in a wireless communication system. For example, by skipping or combining some signals that have overlapping synchronization processing functions, it is possible to efficiently transmit and receive signals with reduced load on the network and terminals.

[0062] (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.

[0063] <Base Station 10> Figure 15 is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention. As shown in Figure 15, 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 15 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiment of the present invention.

[0064] 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.

[0065] 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 relating to settings related to paging notification information and low-power wake-up signals.

[0066] 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.

[0067] <Terminal 20> Fig. 16 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. 16, 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. 16 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.

[0068] 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 setting 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 setting unit 230 stores various setting information received by the receiver 220 from the base station 10. The setting unit 230 also stores pre-set setting information. The setting information includes, for example, information related to settings related to the paging notification information and the low-power wake-up signal.

[0069] The control unit 240 performs settings related to the low-power wake-up signal as described in the embodiment. 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.

[0070] (Hardware Configuration) The block diagrams (FIGS. 15 and 16) 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.

[0071] 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.

[0072] 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. 17 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 15 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. 16 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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).

[0081] 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.

[0082] 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.

[0083] Fig. 18 shows an example configuration of a vehicle 2001. As shown in Fig. 18, 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.

[0084] 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.

[0085] 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).

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] <Configuration related to this embodiment> (Item 1) A terminal having: a control unit that assumes skipping of monitoring at least one of a normal synchronization signal that is also used for signals other than a low power wakeup signal, the synchronization signal of the low power wakeup signal, the preamble of the low power wakeup signal, and a receiving unit that detects and receives the low power wakeup signal when at least one of a time position and a frequency position for the low power wakeup signal, the synchronization signal of the low power wakeup signal, the preamble of the low power wakeup signal, and the low power wakeup signal is set, and (Item 2) The terminal according to Supplementary Item 1, wherein the control unit assumes to execute the skip when, with respect to at least one of a time position and a frequency position, a gap between the position of the normal synchronization signal and the position of the synchronization signal of the low power wakeup signal, or a gap between the position of the synchronization signal of the low power wakeup signal and the position of the synchronization signal of the low power wakeup signal, is smaller than a predetermined threshold. (Item 3) The terminal according to Supplementary Item 1, wherein the control unit assumes that when the synchronization signal of the low power wakeup signal, the preamble of the low power wakeup signal, and the low power wakeup signal are repeatedly transmitted, at least a part of the synchronization signal of the low power wakeup signal and the preamble of the low power wakeup signal are skipped. (Item 4) A terminal having: a control unit that assumes that priorities are set for a normal synchronization signal that is also used for signals other than the low power wakeup signal, the synchronization signal of the low power wakeup signal, and the preamble of the low power wakeup signal, and a receiving unit that receives at least one of the normal synchronization signal that is also used for signals other than the low power wakeup signal, the synchronization signal of the low power wakeup signal, and the preamble of the low power wakeup signal based on the priorities.(Clause 5) A base station having: a control unit that assumes skipping of monitoring at least one of a normal synchronization signal that is also used for signals other than a low-power wake-up signal, the synchronization signal of the low-power wake-up signal, the preamble of the low-power wake-up signal, and the low-power wake-up signal when at least one of a time position and a frequency position is set for the synchronization signal of the low-power wake-up signal, the preamble of the low-power wake-up signal, and the low-power wake-up signal; and a transmission unit that detects and transmits the low-power wake-up signal. (Clause 6) A communication method executed by a terminal, comprising: a step of assuming skipping of monitoring at least one of the synchronization signal of the low power wakeup signal and the preamble of the low power wakeup signal when at least one of a time position and a frequency position is set for a normal synchronization signal that is also used for signals other than the low power wakeup signal, the synchronization signal of the low power wakeup signal, the preamble of the low power wakeup signal, and the low power wakeup signal; and a step of detecting and receiving the low power wakeup signal.

[0094] Any of the above configurations can efficiently transmit and receive synchronization signals for low-power wake-up signals (LP-WUS) in a wireless communication system. For example, by skipping or combining some signals that have overlapping synchronization processing functions, efficient signal transmission and reception with reduced load on the network and terminals is possible.

[0095] (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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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).

[0100] 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.

[0101] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be transmitted to another device.

[0102] 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).

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0121] 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."

[0122] 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.

[0123] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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."

[0143] 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.

[0144] 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.

[0145] 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."

[0146] 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).

[0147] 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.

[0148] 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 assumes skipping of monitoring at least one of a normal synchronization signal that is also used for signals other than a low-power wakeup signal, the synchronization signal of the low-power wakeup signal, the preamble of the low-power wakeup signal, and the low-power wakeup signal when at least one of a time position and a frequency position is set for the synchronization signal of the low-power wakeup signal, the preamble of the low-power wakeup signal, and the low-power wakeup signal; and a receiving unit that detects and receives the low-power wakeup signal.

2. The terminal according to claim 1, wherein the control unit assumes that the skip will be executed when, with respect to at least one of the time position and frequency position, the difference between the position of the normal synchronization signal and the position of the synchronization signal of the low power wakeup signal, or the difference between the position of the synchronization signal of the low power wakeup signal and the position of the synchronization signal of the low power wakeup signal, is smaller than a predetermined threshold.

3. The terminal according to claim 1, wherein the control unit assumes that when a synchronization signal of a low power wakeup signal, a preamble of a low power wakeup signal, and the low power wakeup signal are repeatedly transmitted, at least a portion of the synchronization signal of the low power wakeup signal and the preamble of the low power wakeup signal are skipped.

4. A terminal having: a control unit that assumes that priorities are set for a normal synchronization signal that is also used for signals other than the low power wakeup signal, a synchronization signal for the low power wakeup signal, and a preamble for the low power wakeup signal; and a receiving unit that receives at least one of the normal synchronization signal that is also used for signals other than the low power wakeup signal, the synchronization signal for the low power wakeup signal, and the preamble for the low power wakeup signal based on the priorities.

5. A base station having: a control unit that assumes skipping of monitoring at least one of a normal synchronization signal that is also used for signals other than a low-power wake-up signal, the synchronization signal of the low-power wake-up signal, the preamble of the low-power wake-up signal, and the low-power wake-up signal when at least one of a time position and a frequency position is set for the synchronization signal of the low-power wake-up signal, the preamble of the low-power wake-up signal, and the low-power wake-up signal; and a transmission unit that detects and transmits the low-power wake-up signal.

6. A communication method executed by a terminal, comprising: a step of assuming skipping of monitoring at least one of the synchronization signal of the low power wakeup signal and the preamble of the low power wakeup signal when at least one of the time position and frequency position for a normal synchronization signal that is also used for signals other than the low power wakeup signal, the synchronization signal of the low power wakeup signal, the preamble of the low power wakeup signal, and the low power wakeup signal is set; and a step of detecting and receiving the low power wakeup signal.

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