WO2025041668A1 - Terminal, base station, and communication method - Google Patents

Abstract

This terminal includes: a control unit that performs setting on the basis of setting information with which different setting can be performed for each ultra low power Wake Up Signal reception opportunity; and a reception unit that, on the basis of the setting, receives the ultra low power Wake Up Signal from a base station.

Description

Terminal, base station, and communication method

The present invention relates to a terminal, a base station, and a communication method in a wireless communication system.

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 even larger system capacity, even faster data transmission speeds, and even 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 keeping latency in wireless sections to 1 ms or less (for example, Non-Patent Document 1 and Non-Patent Document 2).

3GPP TS 38.300 V17.3.0 (2022-12) 3GPP TS 38.401 V17.3.0 (2022-12)

In 3GPP Rel-18, an ultra-low power consumption method called LP (Low Power)-WUS/WUR (Wake Up Receiver) is being considered with the aim of further reducing the power consumption of the conventional WUS (Wake Up Signal). In addition, there are discussions regarding the application of LP-WUS/WUR to various types of devices with different reception performance, the fact that it should meet low latency requirements, and coverage expansion.

The present invention has been made in consideration of the above points, and aims to define an efficient method for transmitting and receiving LP-WUS in a wireless communication system.

According to the disclosed technology, a terminal is provided that has a control unit that sets a first period during which an ultra-low power wake-up signal is transmitted, a second period during which all or part of the ultra-low power wake-up signal is repeated within the first period, and an offset that determines the position of the ultra-low power wake-up signal within the first period, and a receiving unit that receives the ultra-low power wake-up signal from a base station based on the settings of the control unit.

The disclosed technology makes it possible to define an efficient LP-WUS transmission and reception method in a wireless communication system.

1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. A diagram for explaining communication by LP-WUS and LP-WUR in an embodiment of the present invention. A diagram for explaining communication by LP-WUS and LP-WUR in an embodiment of the present invention. 1 is a diagram for explaining a LP-WUS transmission method in an embodiment of the present invention. 1 is a diagram for explaining a LP-WUS transmission method in an embodiment of the present invention. A diagram for explaining the format of LP-WUS in an embodiment of the present invention. 1 is a diagram for explaining repeated transmission of LP-WUS in an embodiment of the present invention. FIG. FIG. 2 is a diagram for explaining repeated transmission of LP-WUS in the first embodiment of the present invention. A figure for explaining repeated transmission of LP-WUS in Example 1-1 of the present invention. A figure for explaining repeated transmission of LP-WUS in Example 1-2 of the present invention. A figure for explaining repeated transmission of LP-WUS in Example 1-3 of the present invention. A figure for explaining repeated transmission of LP-WUS in Example 2 of the present invention. A figure for explaining repeated transmission of LP-WUS in Example 3 of the present invention. A figure for explaining repeated transmission of LP-WUS in Example 4-1 of the present invention. A figure for explaining an example of applying power boosting to LP-WUS transmission in Example 4-2 of the present invention. A figure for explaining an example in which the payload of LP-WUS is changed in embodiment 4-3 of the present invention. A figure for explaining an example in which frequency hopping is applied to LP-WUS transmission in Example 4-4 of the present invention. A figure for explaining an example of LP-WUS transmission in Example 4-7 of the present invention. FIG. 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to an embodiment of the present invention. 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 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.

Below, 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 can be applied is not limited to the following embodiment.

　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.

Furthermore, in the embodiment 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), which are 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.

Furthermore, in an embodiment of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (e.g., Flexible Duplex, etc.).

In addition, in the embodiment of the present invention, "configuring" radio parameters and the like may mean that a predetermined value is pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set. The base station 10 or the terminal 20 may pre-set a fixed value defined in the 3GPP standard/specification, or if multiple usable values are defined, the base station 10 may notify the terminal 20 of a value to be set, or the terminal 20 may notify the base station 10 of a value that can be used by the terminal 20. The base station 10 may also be called a network (NW).

FIG. 1 is a diagram showing an example of the configuration of a wireless communication system in an embodiment of the present invention. As shown in FIG. 1, the wireless communication system in 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 multiple of each.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, a PSS and an SSS. The system information is, for example, transmitted by the PBCH and is also called broadcast information. The synchronization signal and the system information may be called an SSB (SS/PBCH block). As shown in FIG. 1, the base station 10 transmits a control signal or data to the terminal 20 in the DL (Downlink) and receives a control signal or data from the terminal 20 in the UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. In addition, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to 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).

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 a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives control signals or data from the base station 10 in DL and transmits control signals or data to the base station 10 in 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 performs measurement of the propagation path quality based on the reception results of the reference signals.

Figure 2 is a diagram for explaining a wireless communication system in an embodiment of the present invention. Figure 2 shows an example of the configuration of a wireless communication system when DC (Dual connectivity) is implemented. As shown in Figure 2, there is provided base station 10A which is an MN (Master Node) and base station 10B which is an SN (Secondary Node). Base station 10A and base station 10B are each connected to a core network. Terminal 20 can communicate with both base station 10A and base station 10B.

The cell group provided by base station 10A, which is an MN, is called the MCG (Master Cell Group), and the cell group provided by base station 10B, which is an SN, is called the 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.

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 explanation, "/" means "or" unless otherwise specified or unless it is clear from the context that it has a different meaning.

Figure 3 is a diagram for explaining communication by 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. Low-Power Wake Up Signal is called LP-WUS or simply WUS, and Low-Power Wake Up Receiver is called LP-WUR, WUR, or LR. As shown in Figure 3(a), a state called Ultra-Deep Sleep is introduced by operating LR, a simple circuit that operates with lower power consumption than MR, as an alternative to Main Radio (MR) used in normal communication. As shown in Figure 3(b), it is being discussed that LR has a function that triggers power ON of MR when LR receives at least an LP-WUS signal. LP-WUS may be called an (ultra) low power wake-up signal.

Figure 4 is a diagram for explaining communication by LP-WUS and LP-WUR in an embodiment of the present invention. In 3GPP, the details of the functions that the LR should have are currently under discussion, including what states, such as RRC IDLE and RRC CONNECTED, the functional expansion should be aimed at, whether functions other than monitoring the LP-WUS and waking up the MR are necessary, and which functions of the MR should be substituted by the LR in the Ultra-Deep Sleep state (for example, RRM in RRC IDLE state). As a possible candidate function under consideration, as shown in Figure 4, it is being considered that the LR receives the LP-WUS, activates the MR, and continues the subsequent monitoring process of the PO. Alternatively, after activating the MR, the RACH procedure, such as transmitting a PRACH, may be continued as an operation for RRC IDLE, or the PDCCH monitoring operation may be continued as an operation for RRC CONNECTED.

Since LP-WUS is designed for an extremely simple receiver (LP-WUR), it is expected to have poor reception sensitivity, and it is unclear whether it will be able to provide coverage equivalent to that of NR. In addition, when the Main Radio (MR) is in sleep mode, it may be difficult to apply advanced methods such as adaptive control, and there are also concerns about increased power consumption due to increased functionality.

In terms of coverage, it is necessary to consider the optimal method in a situation where terminals in the center of coverage and terminals in the edge of coverage are mixed. In 3GPP, the following items are scheduled to be discussed as part of discussions on LP-WUS coverage extension.
Transparent transmit diversity
・Time domain repetition
・Power boost
・Frequency hopping
・FEC (Forward Error Correction)
First Embodiment
A first embodiment will be described. FIG. 5 is a diagram for explaining a method of transmitting an LP-WUS in an embodiment of the present invention. In FIG. 5, the base station 10 sets setting information including information on the range of resources that can be transmitted by the LP-WUS, and transmits the LP-WUS to the terminal 20 at a necessary timing within the set resource range based on the setting information. The terminal 20 sets resources for receiving the LP-WUS based on the setting information including information on the range of resources that can be transmitted by the LP-WUS received from the base station 10, and receives the LP-WUS transmitted from the base station 10. Alternatively, the range of resources that can be transmitted by the LP-WUS may not be set by the base station to the terminal, but the terminal may request the base station to provide a range of resources that can be received, or a unique range or multiple candidates may be specified in the standard specifications. The LP-WUS transmitted in FIG. 5 is, for example, a signal that instructs the MR to wake up (to turn on the power).

The LP-WUS may also include information regarding a terminal identifier (UE_ID) indicating the target terminal 20 to be instructed, or a terminal group identifier (UE_group_ID) indicating a group of target terminals 20 to be instructed, and the LP-WUS may specify multiple UE_IDs or multiple UE_group_IDs. Furthermore, an LP-WUS multiplexed from a single LP-WUS may be generated and transmitted using time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), etc. These LP-WUS instructed targets and multiplexing features may be applied to all of the embodiments shown below.

FIG. 6 is a diagram for explaining a method of transmitting an LP-WUS in an embodiment of the present invention. In FIG. 6, the base station 10 sets configuration information including information on opportunities when an LP-WUS can be transmitted (LP-WUS occasions), and transmits an LP-WUS to the terminal 20 at the required timing within the set resource range based on the configuration information. For example, LP-WUS occasions have a certain time period. The terminal 20 sets resources for receiving an LP-WUS based on the configuration information received from the base station 10 including information on opportunities when an LP-WUS can be transmitted (LP-WUS occasions), and receives the LP-WUS transmitted from the base station 10. In FIG. 6, in addition to LP-WUS (ON) which instructs the MR to be woken up (to be powered ON), LP-WUS (OFF) which instructs the MR not to be woken up (to be powered ON) may be transmitted. LP-WUS (OFF) may also be an instruction to continue powering OFF. Here, the base station 10 may transmit an LP-WUS (LP-WUS(ON) or LP-WUS(OFF)) at every opportunity when an LP-WUS can be transmitted, as shown in FIG. 6(a). Alternatively, as another transmission method, the base station 10 may transmit an LP-WUS only when necessary at an opportunity when an LP-WUS can be transmitted, as shown in FIG. 6(b). In FIG. 6(b), the base station 10 transmits an LP-WUS(ON) indicated by the solid line rectangle, but does not transmit an LP-WUS(OFF) indicated by the dotted line rectangle.

FIG. 7 is a diagram for explaining the format of an LP-WUS in an embodiment of the present invention. FIG. 7 shows five types of LP-WUS formats including a preamble and a payload. In this embodiment, one type of format may be used, or multiple types of formats may be used. The preamble is a signal for the terminal 20 to detect the LP-WUS. The payload includes, for example, information instructing the aforementioned MR to be woken up (to turn the power ON), information instructing the MR not to be woken up (to not turn the power ON), a terminal identifier (UE_ID) indicating the terminal 20 to be instructed, and information regarding a terminal group identifier (UE_group_ID) indicating the group of the terminal 20 to be instructed. Each format will be explained below.

In the first format, the preamble and payload are transmitted when requested. The request may be when the base station 10 requests wake-up of the MR, or when the LP-WUS is transmitted irregularly due to other triggers. The same applies hereafter.

In the second format, the preamble is sent periodically and the payload is sent on request.

The third format involves a preamble that is sent periodically followed by another preamble and payload upon request.

In the fourth format, the preamble, which is sent periodically, and the payload, which is sent upon request, are each sent as separate signals. The preamble, which is a separate signal, may be called LP-SS (Low Power - Synchronization Signal).

In the fifth format, the preamble and payload are transmitted periodically.

<Repeated transmission of LP-WUS>
A method of improving the reception performance of an LP-WUS is to repeatedly transmit the LP-WUS and combine them on the receiving side. Fig. 8 is a diagram for explaining repeated transmission of an LP-WUS in an embodiment of the present invention. In Fig. 8, the LP-WUS is repeatedly transmitted N times in response to one LP-WUS transmission request. This allows the terminal 20 to receive and combine the repeatedly transmitted LP-WUS, thereby improving the reception gain. However, simply performing repeated transmission may result in a large increase in delay compared to transmission using one resource (when repeated transmission is not performed).

In this embodiment, we will explain a method of repeated LP-WUS transmission that suppresses increases in delay.

Example 1
A first embodiment will be described. In the first embodiment, the LP-WUS is repeatedly transmitted with a difference in the temporal density of the LP-WUS. FIG. 9 is a diagram for explaining the repeated transmission of the LP-WUS in the first embodiment of the invention. In FIG. 9, within the transmission period of one LP-WUS occasion, N LP-WUSs repeatedly transmitted at a certain period are densely arranged immediately before a PO (Paging Occasion). By densely arranging the LP-WUS in this way, the time for the terminal 20 to receive all N LP-WUSs is shortened, so that it is possible to reduce the delay. That is, the time from when the base station 10 determines the wake-up instruction and transmits the first LP-WUS to when the PO is made is reduced. Here, the terminal 20 may assume that the LP-WUS sequence, the modulation code, and the information source transmitted by the LP-WUS are the same during the period in which the repeated transmission is performed.

The method for determining the placement (temporal density) of repeatedly transmitted LP-WUS is shown below.

Method 1: The period of the LP-WUS occasion(s) and the period of the repeated transmission are defined separately, allowing different values to be set.

Method 2: The LP-WUS is transmitted during a certain period within the period of the LP-WUS occasion(s). For example, an offset is provided in the first or second half of the LP-WUS, and the time position of the resources used for repeated transmission of the LP-WUS is determined based on the position based on the offset. The offset may be expressed as the number of slots from the first or last slot within the period of the LP-WUS occasion(s) to the first slot of the LP-WUS that is transmitted for the first time.

Method 3: In Method 1 or Method 2, the period of the LP-WUS occasion(s) may be defined individually or based on existing settings such as the period of the PO, the period of the DRX or eDRX, etc.

In this embodiment, the base station 10 may notify the terminals 20 of the setting values related to the repeated transmission of the LP-WUS, such as the period of the LP-WUS occasion(s) and the period of the repeated transmission of the LP-WUS, as individual signaling or system information (MIB or SIB) for each terminal 20.

The terminal 20 may also notify the base station 10 of the setting values for the repeated transmission of LP-WUS that it can support.

In addition, the specification (spec.) may fix the setting value for repeated transmission of LP-WUS, or may define candidate values that can be notified.

(Example 1-1)
An embodiment 1-1 will be described. In the embodiment 1-1, only a part of the components of the LP-WUS (preamble and payload) is repeatedly transmitted in the time direction. FIG. 10 is a diagram for explaining the repeated transmission of the LP-WUS in the embodiment 1-1 of the invention. In FIG. 10, only the payload, which is a component of the LP-WUS, is repeatedly transmitted N times. As a result, since the payload contains necessary information such as instructions regarding wake-up, delays can be efficiently reduced by repeating only the payload.

(Example 1-2)
An embodiment 1-2 will be described. In the embodiment 1-2, only a part of the components of the LP-WUS (preamble and payload) is repeatedly transmitted in the frequency direction. FIG. 11 is a diagram for explaining the repeated transmission of the LP-WUS in the embodiment 1-2 of the invention. In FIG. 11, only the payload, which is a component of the LP-WUS, is repeatedly transmitted in the frequency direction. In addition, in FIG. 11(a), the preamble is transmitted only at the same frequency as one payload, and in FIG. 11(b), it is transmitted at the frequency of all the payloads. Here, the length of time and the length of frequency may be different for each component of the LP-WUS format. In addition, the frequency resource used in the repeated transmission of the LP-WUS may be set by an offset from a reference frequency and a repetition period in the frequency direction.
In this way, by repeatedly transmitting the payload in the frequency direction, there is no delay in the time direction due to repetition, so it is possible to keep the delay short.

(Examples 1 to 3)
An embodiment 1-3 will be described. In the embodiment 1-3, only a part of the components of the LP-WUS (preamble and payload) is repeatedly transmitted in the time direction and the frequency direction. FIG. 12 is a diagram for explaining the repeated transmission of the LP-WUS in the embodiment 1-3 of the invention. In FIG. 12, only the payload, which is a component of the LP-WUS, is repeatedly transmitted in the time direction and the frequency direction. In this way, by repeatedly transmitting the payload in the time direction and the frequency direction, it is possible to increase the number of repetitions and improve the reception performance.

Example 2
A description will now be given of embodiment 2. In embodiment 2, in repeated transmission of LP-WUS, the following two types of methods are used by using each component element or a part of the configuration of the LP-WUS format.

Method 1: Repeatedly transmit the exact same signal using the same modulation and encoding methods. For example, repeatedly transmit the same signal, which is a sequence generated for a preamble, or a sequence of signals modulated and encoded for a payload.

Method 2: Repeatedly transmit different information sequences generated by encoding the same information source. For example, for the preamble, a signal in which a different portion of the generated sequence is cut out is repeatedly transmitted. Alternatively, for the payload, a different information sequence generated by encoding the same information source is repeatedly transmitted. Also, for example, signals generated using different Redundancy Versions may be repeatedly transmitted.

FIG. 13 is a diagram for explaining repeated transmission of an LP-WUS in embodiment 2 of the present invention. FIG. 13(a) is the transmission method shown in method 1, in which the exact same signal is repeatedly transmitted to an LP-WUS consisting of a preamble and a payload. FIG. 13(b) is the transmission method shown in method 2, in which the same preamble but a signal with a different payload is used in the repeated transmission of an LP-WUS consisting of a preamble and a payload.

In the repeated transmission in methods 1 and 2, the base station 10 may notify the terminal 20 of information related to the transmission period in the repeated transmission that the terminal 20 can assume. The notification method is the same as the method described in the first embodiment. Alternatively, the transmission period specified in the specifications may be used.

Information regarding the transmission period may include the transmission period of one or more LP-WUS occasion(s) and the repeat transmission period of multiple LP-WUSs.

Also, for example, even if the elements of the information notified by the LP-WUS change over time, the information notified by the LP-WUS may remain unchanged for a certain period of time in order to assist in synthesis reception on the terminal side.

Example 3
A third embodiment will be described. In the third embodiment, each instance that is repeatedly transmitted may be transmitted periodically and discontinuously. Here, an instance is, for example, a unit of a signal that is repeatedly transmitted, and may be the entire LP-WUS or a part of it. Each instance that is repeatedly transmitted may be transmitted using different resources, i.e., resources that are mutually orthogonal by TDM, FDM, or CDM.

Alternatively, each of the repeatedly transmitted instances may be transmitted as one continuous signal. FIG. 14 is a diagram for explaining the repeated transmission of LP-WUS in embodiment 3 of the present invention. In FIG. 14(a), one signal is transmitted in which the LP-WUS is repeated N times in succession. In FIG. 14(b), one signal is transmitted in which only the payload is repeated N times in succession after the LP-WUS preamble.

The above-described embodiment allows for the specification of a method for transmitting an LP-WUS in a wireless communication system that improves reception performance and reduces delays. The name of the LP-WUS may be a low-power wake-up signal. Furthermore, the settings of the period, offset, resources, and the like related to the repeated transmission of the LP-WUS may be settings in the terminal 20 for receiving the LP-WUS repeatedly transmitted from the base station 10.

Example 4
A fourth embodiment will be described. In the fourth embodiment, a method of performing different settings for each opportunity (LP-WUS occasion) in which the LP-WUS can be transmitted as shown in FIG. 6 (LP-WUS occasions) will be described. This method can be used for coverage extension. The LP-WUS occasion may be called a transmission opportunity of a (ultra) low power wakeup signal from the viewpoint that it is an opportunity for the base station 10 to transmit the LP-WUS, or may be called a reception opportunity of an (ultra) low power wakeup signal from the viewpoint that it is an opportunity for the terminal 20 to receive the LP-WUS.

In order to make the LP-WUS a terminal-specific (UE) signal, for example, a 48-bit 5G-S-TMSI (Temporary Mobile Subscriber Identity) may be notified. In addition, the terminals 20 may be divided into multiple groups, and instructions regarding the LP-WUS may be given on a terminal group (UE group) basis. In this case, it may be assumed that multiple terminals 20 use the same LP-WUS opportunity to monitor the LP-WUS.

LP-WUS occasion may refer to parameters for monitoring LP-WUS. LP-WUS occasion may also be interpreted as an identifier indicating a group of terminals (UEs), such as time/frequency resources related to LP-WUS transmission, a terminal group identifier (UE group ID), and a terminal subgroup identifier (UE sub-group ID).

The base station 10 and/or the terminal 20 may set different communication method settings (parameters, etc.) for each LP-WUS occasion. The communication method is indicated by, for example, the following items.
The first communication method is a communication method related to power boosting.
The second communication method is a communication method related to payload reduction of LP-WUS.
The third communication method is a communication method involving repetition (transmission and reception) of LP-WUS in the time direction and/or interleaved transmission.
The fourth communication method is a communication method related to frequency hopping.
The fifth communication method is a communication method related to Multiple Input Multiple Output (MIMO).
The sixth communication method is a communication method related to channel coding, and may include setting values (parameters) such as a modulation rate and a coding rate.

When the LP-WUS occasion to be monitored is determined, the terminal 20 may select any one or more LP-WUS occasions from among the candidate LP-WUS occasions and monitor them (use them for LP-WUS monitoring).

The base station 10 may select one or more optimal LP-WUS occasions based on the reception quality fed back from the terminal 20, and notify the terminal 20 that the selected LP-WUS occasions will be used.

If the terminal 20 and/or base station 10 determines that the currently requested (or indicated) LP-WUS occasion is not appropriate, it may change the LP-WUS occasion, change the LP-WUS occasion settings, and/or deactivate the LP-WUS.

(Example 4-1)
Fig. 15 is a diagram for explaining repeated transmission of LP-WUS in embodiment 4-1 of the present invention. As shown in Fig. 15, a plurality of LP-WUS occasions are prepared, and a different number of repetitions (1 time, 2 times, etc.) is applied to each LP-WUS occasion. For example, a terminal 20 existing in the center of a cell (center of coverage) may apply an LP-WUS occasion with a small number of repetitions, and a terminal 20 existing in the edge of a cell (edge of coverage) may apply an LP-WUS occasion with a large number of repetitions. In addition, the repeated transmission of LP-WUS may be a simple repetition or an interleaved transmission.

(Example 4-2)
Fig. 16 is a diagram for explaining an example in which power boosting is applied to the transmission of LP-WUS in embodiment 4-2 of the present invention. As shown in Fig. 16, the LP-WUS is transmitted with different transmission power for each LP-WUS occasion. For example, a terminal 20 located in the center of a cell (center of coverage) may apply an LP-WUS occasion with low transmission power, and a terminal 20 located at the edge of a cell (edge of coverage) may apply an LP-WUS occasion with high transmission power.

(Example 4-3)
Fig. 17 is a diagram for explaining an example in which the payload of the LP-WUS is changed in the embodiment 4-3 of the present invention. As shown in Fig. 17, a different LP-WUS configuration is used for each LP-WUS occasion. For the LP-WUS configuration, the format shown in Fig. 7 can be used.

(Example 4-4)
Fig. 18 is a diagram for explaining an example in which frequency hopping is applied to the transmission of LP-WUS in embodiment 4-4 of the present invention. As shown in Fig. 18, the LP-WUS is transmitted using a different frequency for each LP-WUS occasion. For example, a terminal 20 located in the center of a cell (center of coverage) may apply an LP-WUS occasion using a narrow frequency band, and a terminal 20 located at the edge of a cell (edge of coverage) may apply an LP-WUS occasion using a wide frequency band.

(Examples 4-5)
The base station 10 and the terminal 20 may assume different LP-WUS transmission methods for a particular LP-WUS occasion as follows.
・High-order or low-order MIMO diversity is applied. ・High-order or low-order modulation method is applied. ・High or low coding rate is assumed (Examples 4-6)
The base station 10 and/or the terminal 20 may associate a synchronization signal block identifier (SSB (SS/PBCH block) index) with an LP-WUS occasion. Since a plurality of terminals 20 share an LP-WUS occasion, it is necessary to perform beam sweeping of the LP-WUS. Therefore, for example, by assuming that the optimal beam of the first LP-WUS occasion is assigned only to the terminal 20 with the first SSB index, unnecessary beam sweeping can be suppressed, and thus the effect of reducing overhead can be obtained.

(Examples 4 to 7)
The base station 10 and/or the terminal 20 may associate an LP-WUS occasion with a function provided by the LP-WUS. For example, when multiple optional notification information items are defined for an LP-WUS (such as ETWS/CMAS notification), different LP-WUS occasions may be set for an LP-WUS with a minimum amount of notification information and an LP-WUS with more notification information. ETWS is an abbreviation for Earthquake and Tsunami Warning System, and CMAS is an abbreviation for Commercial Mobile Alert System.

This makes it possible to prevent unnecessary increases in power consumption and reductions in coverage caused by an increase in notification information due to information that is not necessarily required by all types of devices (terminals 20), such as ETWS/CMAS notifications.

Furthermore, different LP-WUS configurations may be assumed depending on the receiver configuration, and different LP-WUS occasions may be assumed for each configuration.

For example, different LP-WUS configurations may be assumed depending on whether or not there is an LP-WUS for an extremely simple receiver (envelope detector) and an LP-WUS for a more advanced OFDM based receiver, or a signal configuration such as LP-SS (synchronization signal for LP-WUS), and different LP-WUS occasions may be assumed for each configuration. For the LP-WUS configuration, the format shown in Figure 7 may be used.

FIG. 19 is a diagram for explaining an example of LP-WUS transmission in embodiment 4-7 of the present invention. As shown in FIG. 19, the LP-WUS configuration is changed for each LP-WUS occasion, and a multi-stage LP-WUS configuration capable of transmitting a large amount of information is applied to some terminals 20.

(Examples 4 to 8)
When the LP-WUS is configured, the terminal 20 transmits (feeds back) to the base station 10, as an optional operation, reception qualities such as Reference Signal Received Quality (RSRQ), Reference Signals Received Power (RSRP), Received Signal Strength Indicator (RSSI), and RSSP measured by the terminal 20.

Based on the reception quality received from the terminal 20, the base station 10 selects the optimal number of LP-WUS repetitions and sets the LP-WUS occasion based on this selection.

Information regarding reception quality may use existing metrics defined for MR (Main Radio) or may be newly defined for LP-WUS.

Alternatively, assuming that one LP-WUS occasion is set for each terminal group identifier (UE group ID), the group with the minimum number of repetitions may be defined as UE group ID = 1, the group with two repetitions may be defined as UE group ID = 2, and the base station 10 may notify the terminal 20 of the terminal group identifier (UE group ID).

Alternatively, the terminal 20 may select an appropriate LP-WUS occasion or a terminal group identifier (UE group ID) associated with the appropriate LP-WUS occasion, and request the base station 10 to use the selected appropriate LP-WUS occasion or the terminal group identifier (UE group ID) associated with the appropriate LP-WUS occasion.

For example, the following two methods can be used:

(Method 1)
The base station 10 sets a repetition count list for each LP-WUS occasion for the terminal 20 by higher layer signaling such as RRC, MAC CE, etc.

The base station 10 sets (instructs) the terminal 20 to use (monitor) the LP-WUS occasion to be used (monitored) in accordance with the reception quality such as RSRP fed back from the terminal 20, in order to set the number of LP-WUS repetitions for the terminal 20.

(Method 2)
The base station 10 sets a repetition count list for each LP-WUS occasion for the terminal 20 by higher layer signaling such as RRC, MAC CE, etc.

The terminal 20 determines the LP-WUS occasion (i.e., the number of repetitions) to use (monitor) depending on its own reception quality.

As a result, terminal 20 only needs to monitor the LP-WUS occasion for its own terminal, and does not need to monitor the LP-WUS occasion for terminals other than its own.

In addition, in order to ensure coverage for terminals 20 located at the cell edge (coverage edge), a large number of repetitions is not applied to all LP-WUS occasions and all terminals 20, but rather, an LP-WUS occasion with a small number of repetitions is applied to terminals 20 located at the cell center (coverage center), and an LP-WUS occasion with a large number of repetitions is applied to terminals 20 located at the cell edge (coverage edge), thereby making it possible to provide appropriate coverage.

(Examples 4 to 9)
The base station 10 may instruct the terminal 20 to monitor one or more LP-WUS occasions.

Alternatively, the setting information (number of repetitions, power boosting, etc.) of the candidate LP-WUS occasions may be notified to the terminal 20 as list information, and the terminal 20 may request an appropriate LP-WUS occasion based on the list information.

In addition, a monitoring priority may be set for a terminal 20 that has multiple LP-WUS occasions set.

This enables the terminal 20 to monitor LP-WUS occasions with fewer repetitions preferentially, and to increase the number of repetitions if detection fails. The priority may be notified together with the list information described above, or the amount of notification information may be reduced by notifying only the priority.

(Examples 4 to 10)
When the terminal 20 detects an event such as the reception quality fed back to the base station 10 by the terminal 20 described in Examples 4-8 falling below a certain threshold, the terminal 20 may request the base station 10 to reassign an appropriate terminal group identifier (UE group ID), or the terminal 20 may instruct the base station 10 of an appropriate terminal group identifier (UE group ID).

Alternatively, when the base station 10 detects the event, the base station 10 may perform a reassignment of an appropriate terminal group identifier (UE group ID).

Specifically, for example, perform the following steps:

Step 1: When the LP-WUS is set, the terminal 20 uses the setting as a trigger to execute the next step 2.

Step 2: The terminal 20 transmits the measured reception quality such as RSRQ, RSRP, RSSI, and RSSP as feedback to the base station 10. The metric included in the feedback as quality information may be an existing metric defined for MR (Main Radio), or may be a new metric defined for LP-WUS.

The above-described embodiment makes it possible to define an efficient method for transmitting and receiving LP-WUS in a wireless communication system.

(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-mentioned embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions in the embodiments.

<Base Station 10>
Fig. 20 is a diagram showing an example of a functional configuration of a base station 10 in an embodiment of the present invention. As shown in Fig. 20, 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. 20 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 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The transmitting unit 110 also transmits an ultra-low power wake-up signal, and setting information, instructions, and notifications related to the ultra-low power wake-up signal, to the terminal 20. The transmitting unit 110 also transmits notifications related to switching of monitoring operations to the terminal. The receiving unit 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 signals. The transmitting unit 110 also has a function of transmitting PSS, SSS, PBCH, DL/UL control signals, and the like to the terminal 20. The receiving unit 120 also receives inter-network node messages from other network nodes.

The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The contents of the setting information include, for example, information related to settings related to paging notification information and low power wake-up signals.

As described in the embodiment, the control unit 140 controls settings, instructions, and notifications related to repeated transmission of an ultra-low power wake-up signal, etc. The functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

<Terminal 20>
Fig. 21 is a diagram showing an example of a functional configuration of the terminal 20 in the embodiment of the present invention. As shown in Fig. 21, 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. 21 is merely an example. As long as the operation related to the embodiment of the present invention can be executed, the names of the functional divisions and the functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The transmitting unit 210 also transmits capability information related to repeated transmission of the ultra-low power wake-up signal to the base station 10. The receiving unit 220 wirelessly receives various signals and acquires higher layer signals from the received physical layer signals. The receiving unit 220 also has a function of receiving PSS, SSS, PBCH, DL/UL/SL control signals, etc. transmitted from the base station 10. The receiving unit 220 also receives paging notification information and setting information, instructions, notifications, etc. related to the low power wake-up signal from the base station 10. For example, the receiving unit 220 receives an ultra-low power wake-up signal from the base station 10. The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores setting information that is set in advance. The configuration information includes, for example, information related to settings for paging notification information and low power wakeup signals.

The control unit 240 performs settings related to the ultra-low power wake-up signal as described in the embodiment. The functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

(Hardware configuration)
The block diagrams (FIGS. 20 and 21) used in the description of the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the one device or the multiple devices with software.

Functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the transmission function is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on the method of realization for either of these.

For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 22 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 in one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 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.

In the following description, the term "apparatus" may be interpreted as a circuit, device, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

The functions of the base station 10 and the terminal 20 are realized by loading specific software (programs) onto hardware such as the processor 1001 and the storage device 1002, causing the processor 1001 to perform calculations, control communications by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

The processor 1001 reads out a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to the program. The program is a program that causes a computer to execute at least a part of the operations described in the above-mentioned embodiment. For example, the control unit 140 of the base station 10 shown in FIG. 20 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001. For example, the control unit 240 of the terminal 20 shown in FIG. 21 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001. Although the above-mentioned various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from a network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), 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 relating to one embodiment of the present disclosure.

The auxiliary 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 suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

The communication device 1004 is hardware (transmitting/receiving 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, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the transmitting/receiving antenna, an amplifier unit, a transmitting/receiving unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmitting/receiving unit may be implemented as a transmitting unit or a receiving unit that is physically or logically separated.

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 structure (e.g., a touch panel).

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.

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.

FIG. 23 shows an example configuration of a vehicle 2001. As shown in FIG. 23, 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 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect/embodiment described in this disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

The drive unit 2002 is composed of, for example, 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 handlebar), 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.

The electronic control unit 2010 is composed of a microprocessor 2031, 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).

Signals from the various sensors 2021-2029 include a current signal from a current sensor 2021 that senses the motor current, a front or rear wheel rotation speed signal acquired by a rotation speed sensor 2022, a front or rear wheel air pressure signal acquired by an air pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, an accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, a brake pedal depression amount signal acquired by a brake pedal sensor 2026, a shift lever operation signal acquired by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028.

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 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 an external device via the communication module 2013 or the like to provide various 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 perform output to the outside.

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 a millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high definition (HD) maps, autonomous vehicle (AV) maps, etc.), a gyro system (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chip, and an AI processor, 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 driving assistance functions or autonomous driving functions.

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 between 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.

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, etc.

The communication module 2013 may transmit at least one of the signals from the various sensors 2021-2028 described above 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 input.

The communication module 2013 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device, and displays it on the 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 various information received from an external device 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.

<Configuration of this embodiment>
(Section 1)
A terminal having a control unit that performs settings based on setting information that allows different settings for each opportunity to receive an ultra-low power wake-up signal, and a receiving unit that receives the ultra-low power wake-up signal from a base station based on the settings.

(Section 2)
The terminal of claim 1, wherein the setting information includes settings for at least one communication method, including power boost, payload reduction, time direction repetition, frequency hopping, multiple input multiple output, and channel coding, which can be set differently for each of the ultra-low power wake-up signals.

(Section 3)
The terminal described in claim 1, wherein the receiving unit receives list information including a plurality of the setting information from the base station, and the control unit performs configuration using setting information selected from the list information based on the reception quality obtained by measuring the quality of the received signal.

(Section 4)
The terminal described in claim 1, further comprising a transmitting unit that transmits a reception quality obtained by measuring the quality of a received signal to the base station, the receiving unit receiving from the base station the setting information determined by the base station based on the reception quality, and the control unit performing setting based on the setting information.

(Section 5)
A base station having a control unit that performs settings based on setting information that allows different settings for each transmission opportunity of an ultra-low power wake-up signal, and a transmission unit that transmits the ultra-low power wake-up signal to a terminal based on the settings.

(Section 6)
A communication method executed by a terminal, comprising: a step of performing a setting based on setting information that allows different settings for each opportunity to receive an ultra-low power wake-up signal; and a step of receiving the ultra-low power wake-up signal from a base station based on the setting.

Any of the above-mentioned embodiments can define an efficient LP-WUS transmission and reception method in a wireless communication system.

(Supplementary description of the embodiment)
Although the embodiment of the present invention has been described above, the disclosed invention is not limited to such an embodiment, and those skilled in the art will understand various modifications, modifications, alternatives, replacements, and the like. Although the description has been given using specific numerical examples to facilitate understanding of the invention, unless otherwise specified, those numerical values are merely examples and any appropriate value may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be used in combination as necessary, and matters described in one item may be applied to matters described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operations of multiple functional units may be physically performed by one part, or the operations of one functional unit may be physically performed by multiple parts. The order of the processing procedures described in the embodiment may be changed as long as there is no contradiction. For convenience of the processing description, the base station 10 and the 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 possessed by the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor possessed by 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.

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 of these. Furthermore, 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, etc.

Each aspect/embodiment described in this disclosure may be applied to at least one of systems utilizing 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. Additionally, multiple systems may be combined (for example, a combination of at least one of LTE and LTE-A with 5G, etc.).

The processing steps, sequences, flow charts, etc. of each aspect/embodiment described herein may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an exemplary order and are not limited to the particular order presented.

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

The information or signals described in this disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). They may be input and output via multiple network nodes.

The input and output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added to. The output information may be deleted. The input information may be sent to another device.

The determination in this disclosure may be based on a value represented by one bit (0 or 1), a Boolean (true or false) value, or a comparison of numerical values (e.g., a comparison with a predetermined value).

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.

Software, instructions, information, etc. may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the 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.

Note that the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Also, the signal may be a message. Also, the component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

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

In addition, the information, parameters, etc. described in this disclosure may be represented using absolute values, may be represented using relative values from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

The names used for the parameters described above are not intended to be limiting in any way. Furthermore, the formulas etc. 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.

In this disclosure, terms such as "base station (BS)", "wireless 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 macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of at least one of the base station and base station subsystems that provide communication services in this coverage.

In this disclosure, a 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.

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

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.

At least one of the base station and the mobile station may be called 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 moving object, the moving object itself, etc. The moving object is a movable object, and the moving speed is arbitrary. It also includes the case where the moving object is stopped. The moving object includes, but is not limited to, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, an excavator, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a handcar, a rickshaw, a ship and other watercraft, an airplane, a rocket, an artificial satellite, a drone (registered trademark), a multicopter, a quadcopter, a balloon, and objects mounted thereon. The moving object may also be a moving object that travels autonomously based on an operation command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, 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.

Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect/embodiment 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, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). 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, the uplink channel, downlink channel, etc. may be read as a side channel.

Similarly, the user terminal in this disclosure may be interpreted as a base station. In this case, the base station may be configured to have the functions of the user terminal described above.

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, search, inquiry (e.g., searching in a table, database, or other data structure), and considering ascertaining as "judging" or "determining." Also, "determining" and "determining" may include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and considering ascertaining as "judging" or "determining." Additionally, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to have been "judged" or "decided." In other words, "judgment" and "decision" can include considering some action to have been "judged" or "decided." Additionally, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

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 at least one of one or more wires, cables, and 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.

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

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."

Any reference to an element using a designation such as "first," "second," etc., used in this disclosure 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 precede the second element in some way.

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

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." Additionally, the term "or," as used in this disclosure, is not intended to be an exclusive or.

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.

Numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology may indicate, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.

A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may be a time unit based on numerology.

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.

Radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals. Radio frame, subframe, slot, minislot, and symbol may each be referred to by a different name that corresponds to the radio frame, subframe, slot, minislot, and symbol.

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. In other words, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 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.

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.

The TTI may be a transmission time unit for a channel-coded 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) in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

Note that 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 of scheduling. In addition, the number of slots (minislots) that constitute the minimum time unit of scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that 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 equal to or greater than 1 ms.

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

Furthermore, the time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

In addition, one or more RBs may be referred to as a physical resource block (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource area of one subcarrier and one symbol.

A bandwidth part (BWP), which may also be referred to as a partial 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 an index of the RB relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

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.

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 "cell," "carrier," etc. in this disclosure may be read as "BWP."

The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, 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, as well as the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

In this disclosure, where articles have been added through translation, such as a, an, and the in English, this disclosure may include that the nouns following these articles are plural.

In this 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 "combined" may also be interpreted in the same way as "different."

Each aspect/embodiment described in this disclosure may be used alone, in combination, or switched depending on the execution. In addition, notification of specific information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).

　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 as an illustrative example and does not have any limiting meaning with respect to the present disclosure.

This patent application claims priority to Japanese Patent Application No. 2023-136410, filed on August 24, 2023, and the entire contents of Japanese Patent Application No. 2023-136410 are incorporated herein by reference.

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 wheel 2008 Rear wheel 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotational speed sensor 2023 Air 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 unit 2031 Microprocessor 2032 Memory (ROM, RAM)
2033 Communication port (IO port)

Claims (6)

A control unit that performs setting based on setting information that allows different settings to be made for each opportunity to receive an ultra-low power wakeup signal;
a receiving unit that receives the ultra-low power wake-up signal from a base station based on the setting;
A terminal having the above configuration. The terminal of claim 1, wherein the setting information includes settings for at least one communication method of power boost, payload reduction, time direction repetition, frequency hopping, multiple input multiple output, and channel coding, which can be set differently for each of the ultra-low power wake-up signals. The receiving unit receives list information including a plurality of pieces of the setting information from the base station,
The terminal according to claim 1 , wherein the control unit performs setting using setting information selected from the list information based on a reception quality obtained by measuring a quality of a received signal. A transmitter that measures the quality of a received signal and transmits the measured quality to the base station,
The receiving unit receives, from the base station, the setting information determined by the base station based on the reception quality;
The terminal according to claim 1 , wherein the control unit performs setting based on the setting information. A control unit that performs setting based on setting information that allows different settings for each opportunity to transmit the ultra-low power wakeup signal;
A transmitter that transmits the ultra-low power wakeup signal to a terminal based on the setting;
A base station having A step of performing a setting based on setting information that allows different settings for each opportunity to receive an ultra-low power wakeup signal;
receiving the ultra low power wake-up signal from a base station based on the setting;
A communication method performed by a terminal having the above configuration.

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