Terminal, base station, and communication method

Abstract

A terminal comprising: a control unit which divides terminals that receive a low-power wake-up signal into a plurality of terminal groups and which determines a transmission occasion of the low-power wake-up signal to be monitored on the basis of mapping that associates terminals in sub-groups obtained by further dividing each terminal group with a plurality of transmission occasion groups obtained by classifying transmission occasions of the low-power wake-up signal; and a reception unit which monitors and receives the low-power wake-up signal at the determined transmission occasion.

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

[0004] In 3GPP Rel-18, an ultra-low power LP (Low Power)-WUS / WUR (Wake Up Receiver) scheme is being considered to further reduce 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. Furthermore, to prevent an increase in terminal power consumption, it is necessary to efficiently wake up only necessary terminals by mapping and allocating low power wake up signal (LP-WUS) transmission opportunities for each terminal group.

[0005] The present invention has been made in consideration of the above points, and aims to efficiently map terminals and LP-WUS transmission opportunities when transmitting and receiving low-power wake-up signals (LP-WUS).

[0006] According to the disclosed technology, a terminal is provided that has: a control unit that divides terminals that receive a low-power wake-up signal into a plurality of terminal groups, and determines a transmission opportunity for the low-power wake-up signal to monitor based on a mapping that associates terminals in subgroups that are further divided into the terminal groups with a plurality of transmission opportunity groups that classify transmission opportunities for the low-power wake-up signal; and a receiving unit that monitors and receives the low-power wake-up signal at the determined transmission opportunity.

[0007] According to the disclosed technology, efficient mapping of terminals and LP-WUS transmission opportunities can be performed when transmitting and receiving low power wake-up signals (LP-WUS).

[0008] FIG. 1 is a diagram for explaining a wireless communication system in an embodiment of the present invention. FIG. 1 is a diagram for explaining a wireless communication system in an embodiment of the present invention. FIG. 2 is a diagram for explaining communication by an LP-WUS and an LP-WUR in an embodiment of the present invention. FIG. 3 is a diagram for explaining communication by an LP-WUS and an LP-WUR in an embodiment of the present invention. FIG. 4 is a diagram for explaining a method for transmitting an LP-WUS in an embodiment of the present invention. FIG. 5 is a diagram for explaining a format of an LP-WUS in an embodiment of the present invention. FIG. 6 is a diagram for explaining a first example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 7 is a diagram for explaining a second example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 8 is a diagram for explaining a third example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 9 is a diagram for explaining a fourth example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 10 is a diagram for explaining a fifth example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 11 is a diagram for explaining a sixth example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 12 is a diagram for explaining a seventh example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 10 is a diagram for explaining an eighth example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 11 is a diagram for explaining an example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 12 is a diagram for explaining an example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 13 is a diagram for explaining an example of mapping between terminal groups and LPOs in an embodiment of the present invention. FIG. 14 is a diagram for explaining an example of a functional configuration of a base station 10 in an embodiment of the present invention. FIG. 15 is a diagram for explaining an example of a functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 16 is a diagram for explaining an example of a hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention. FIG. 17 is a diagram for explaining an example of a configuration of a vehicle 2001 in an embodiment of the present invention.

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

[0010] In the operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate. However, the existing technology is, for example, the existing LTE, but is not limited to the existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (e.g., NR), unless otherwise specified.

[0011] In addition, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) used in existing LTE are used. This is for convenience of description, and similar signals, functions, etc. may be called by other names. The above-mentioned terms in NR are referred to as SS, PSS, SSS, PBCH, PRACH, etc. without any particular distinction from LTE.

[0012] Furthermore, in the embodiment of the present invention, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or another method (for example, flexible duplex, etc.).

[0013] Furthermore, in the embodiments of the present invention, "configuring" radio parameters etc. may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

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

[0015] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. Physical resources of a wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal may be, for example, a PSS or an SSS. The system information is transmitted, for example, via the PBCH and is also referred to as broadcast information. The synchronization signal and system information may also be referred to as an SSB (SS / PBCH block). As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 in a downlink (DL) and receives control signals or data from the terminal 20 in an uplink (UL). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to the DL or UL. In addition, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0016] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures propagation path quality based on the reception results of the reference signals.

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

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

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

[0020] FIG. 3 is a diagram illustrating communication 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. The Low-Power Wake Up Signal is referred to as LP-WUS or simply WUS, and the 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 is introduced by operating the LR, a simple circuit that operates with lower power consumption than the Main Radio (MR) used in normal data communications. As shown in FIG. 3(b), the LR may have a function that triggers the power-off of the MR or the power-on of the MR when the LR receives an LP-WUS signal as shown in FIG. 3(a).

[0021] 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 details of the functions that the LR should have are currently under discussion, including the types of states, such as RRC IDLE and RRC CONNECTED, for which the functions should be extended, whether functions other than monitoring the LP-WUS and waking up the MR are necessary, and which functions of the MR in the Ultra-Deep sleep state should be substituted by the LR (for example, RRM in the RRC IDLE state). As a potential candidate function under consideration, as shown in FIG. 4, transmitting an LP-WUS including information indicating whether a PO should be monitored, and having the LR receive the LP-WUS, activate the MR, and continue the subsequent PO monitoring process are being considered. 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.

[0022] Furthermore, in 3GPP, it is being discussed that LP-WUS / WUR should be applied to various types of devices and that it should meet low latency requirements.

[0023] (First Embodiment) A first embodiment will be described. FIG. 5 is a diagram illustrating a method for transmitting an LP-WUS according to an embodiment of the present invention. In FIG. 5, a base station 10 sets configuration information including information regarding the range of resources available for transmission by an LP-WUS, and transmits an LP-WUS to a terminal 20 at the required timing within the set resource range based on the configuration information. The terminal 20 sets resources for receiving an LP-WUS based on the configuration information received from the base station 10, including information regarding the range of resources available for transmission by an LP-WUS, and receives the LP-WUS transmitted from the base station 10. Alternatively, the range of resources available for transmission by an LP-WUS may not be set by the base station to the terminal, but the terminal may request the base station to specify the range of resources available for reception, 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 explicitly or implicitly notifies an instruction regarding a trigger for powering on or off the MR.

[0024] Furthermore, the LP-WUS may include information regarding a terminal identifier (which may be called a UE_ID or another name) indicating the terminal 20 to be designated, or a terminal group identifier (which may be called a UE_group_ID or another name) indicating a group of terminals 20 to be designated, and the LP-WUS may specify multiple UE_IDs or multiple UE_group_IDs. The terminal group identifier may be an identifier indicating a larger group including multiple terminal groups, or an identifier indicating a subgroup obtained by dividing one terminal group. Furthermore, a single LP-WUS may be multiplexed using time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), or the like to generate and transmit an LP-WUS. These characteristics regarding the target of the LP-WUS and multiplexing may be applied to all of the embodiments described below.

[0025] FIG. 6 is a diagram illustrating a method for transmitting an LP-WUS according to an embodiment of the present invention. In FIG. 6, the base station 10 configures configuration information including information on opportunities (LP-WUS occasions) when an LP-WUS can be transmitted, and transmits the LP-WUS to the terminal 20 at the required timing within the configured resource range based on the configuration information. For example, the LP-WUS occasions have a fixed time period. The terminal 20 configures resources for receiving the LP-WUS based on the configuration information received from the base station 10 including information on opportunities (LP-WUS occasions) when an LP-WUS can be transmitted, and receives the LP-WUS transmitted from the base station 10. In FIG. 6, in addition to an LP-WUS (ON) command to wake up the MR (to turn the power ON), an LP-WUS (OFF) command not to wake up the MR (to turn the power ON) may be transmitted. The LP-WUS (OFF) may also be an instruction to continue powering off. Here, as shown in FIG. 6( a), 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. Alternatively, as another transmission method, the base station 10 may transmit an LP-WUS only when necessary at opportunities 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 a solid-line rectangle, but does not transmit an LP-WUS(OFF) indicated by a dotted-line rectangle.

[0026] FIG. 7 is a diagram illustrating the format of an LP-WUS in an embodiment of the present invention. Five types of LP-WUS formats, each including a preamble and a payload, are shown in FIG. 7. 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 above-mentioned MR to wake up (turn on the power), information instructing the MR not to wake up (not to turn on the power), 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 terminals 20 to be instructed. Each format will be described below.

[0027] 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 hereinafter.

[0028] In the second format, the preamble is sent periodically and the payload is sent on demand.

[0029] In the third format, a preamble is transmitted periodically followed by another preamble and payload upon request.

[0030] In the fourth format, a preamble is transmitted periodically and a payload is transmitted upon request as separate signals. The separate preamble may be called a Low Power Synchronization Signal (LP-SS).

[0031] In the fifth format, the preamble and payload are transmitted periodically.

[0032] In the sixth format, only the payload is transmitted on demand or periodically, e.g., if synchronization is already established using a synchronization signal such as an NR SSB, no preamble is transmitted and only the payload is transmitted.

[0033] (Mapping of Terminal Groups and Low Power Wakeup Signals) The power consumption effect of LP-WUS depends on the traffic of the channel targeted for power consumption reduction. For example, when LP-WUS is applied to paging operation as an IDLE operation in terminal 20, if the paging traffic is very high, terminal 20 equipped with LP-WUR will activate MR frequently, thereby reducing the power consumption effect.

[0034] As a method for suppressing the reduction in power consumption effect during high traffic, it is possible to divide the terminals 20 (terminal identifiers) that monitor LP-WUS transmission opportunities (LP-WUS Occasions, LPOs) into multiple groups, assign (map) them to grouped terminal groups (UE groups), and prepare an LPO for each terminal group.

[0035] Here, since traffic density depends on the operational status of the network, it is desirable that it can be optimized by the network operator.

[0036] Furthermore, compared to existing wake-up signals, LP-WUS / WUR may not be able to guarantee power consumption benefits unless the number of terminals 20 per LPO is limited, so it is desirable to be able to adjust the density of terminals 20 more flexibly.

[0037] On the other hand, LP-WUS is a physical signal that differs from general RRC signaling, and it may not be possible to vary the data rate. Furthermore, the communication capacity that LP-WUS can transmit is likely to be limited to an extremely small value. Therefore, it may be difficult to adaptively increase the number of terminal groups.

[0038] (Example) An example will be described below. In this example, a method for efficiently mapping a terminal and an LP-WUS transmission opportunity in transmitting and receiving a low power wakeup signal (LP-WUS) will be described.

[0039] (First embodiment) A first embodiment will be described. In the first embodiment, all terminals 20 are mapped to a common LPO. In this case, the number of terminal groups is one.

[0040] The base station 10 transmits the LP-WUS to the terminals 20 in the LPOs to which all the terminals 20 are mapped (assigned).

[0041] The terminals 20 receive the LP-WUS from the base station 10 in the LPOs to which all the terminals 20 are mapped (assigned).

[0042] 8 is a diagram illustrating a first example of mapping between terminal groups and LPOs in an embodiment of the present invention. As shown in FIG. 8, all terminals 20 with terminal identifiers 1 to N are grouped into a first terminal group, and the first terminal group is mapped to all LPOs. Here, the terminal identifier may be a UE_ID, or may be a range of identifiers indicating any paging occasion (PO) or terminals 20 associated with an LPO, or a range of identifiers for terminals 20 equipped with an LP-WUR. The same applies to the terminal identifiers in the following examples.

[0043] (Embodiment 2) A description will be given of embodiment 2. In embodiment 2, the terminals 20 are divided into a plurality of terminal groups, and each terminal group is mapped to a different LPO.

[0044] The base station 10 transmits the LP-WUS to the terminal 20 in the LPO mapped for each terminal group.

[0045] The terminal 20 receives the LP-WUS from the base station 10 in the LPO mapped for each terminal group.

[0046] 9 is a diagram illustrating a second example of mapping between UE groups and LP-WUSs in an embodiment of the present invention. As shown in FIG. 9, terminals 20 with terminal identifiers 1 to N are grouped into two terminal groups: a first terminal group and a second terminal group. The first terminal group is mapped to the LPO indicated by the solid line, and the second terminal group is mapped to the LPO indicated by the dashed line. That is, terminals 20 are mapped to different LPOs for each terminal group.

[0047] (Example 3) Example 3 will be described. In Example 3, the terminals 20 are divided into a plurality of terminal groups, and the terminals 20 are mapped to all LPOs for each terminal group. Here, the LP-WUS transmitted in the LPO includes information indicating the terminal group that is the target of the wake-up instruction. The wake-up instruction is, for example, an instruction to turn on or off the power of the MR. The same applies to the following examples.

[0048] In the LPO, the base station 10 transmits to the terminal 20 an LP-WUS including information indicating the terminal group that is the target of the wake-up instruction.

[0049] In the LPO, the terminal 20 receives from the base station 10 an LP-WUS including information indicating the terminal group that is the target of the wake-up instruction.

[0050] FIG. 10 is a diagram illustrating a third example of mapping between UE groups and LP-WUSs in an embodiment of the present invention. As shown in FIG. 10, all terminals 20 with terminal identifiers 1 to N are grouped into two terminal groups: a first terminal group and a second terminal group. The first terminal group and the second terminal group are mapped to all LPOs. Here, the LP-WUS transmitted in the LPO includes designation information specifying the terminal group that is the target of the wake-up instruction. The designation information is, for example, two-bit information, with one bit corresponding to the first terminal group and the second terminal group, and the bit information is set to 1 when a wake-up instruction is issued. Alternatively, a wake-up instruction may be executed with a smaller amount of designation information by defining in advance in specifications patterns such as waking up all terminals, not waking up all terminals, or waking up only specific combinations of terminal groups, or by notifying the terminal of a list of such patterns. The same applies to the designation information in the following examples.

[0051] (Fourth embodiment) A fourth embodiment will be described. In the fourth embodiment, two independent groups are defined: terminal groups, which are obtained by dividing terminals 20 into a plurality of groups, and LPO groups, which are obtained by classifying LPOs into a plurality of groups. Furthermore, the terminals 20 in each terminal group are divided into subgroups, and the subgroups are mapped to different LPO groups. That is, terminals 20 in the same subgroup are mapped to the same LPO group.

[0052] The base station 10 divides the terminals 20 that receive the LP-WUS into multiple terminal groups, determines an LPO transmission opportunity based on a mapping that associates the terminals 20 in the subgroups that are further divided into the terminal groups with multiple LPO groups into which the LPOs are classified, and transmits the LP-WUS in the determined LPO. The LP-WUS includes designation information that designates the terminal group that is the target of the wake-up instruction.

[0053] Furthermore, the terminal 20 divides the terminals 20 that receive the LP-WUS into multiple terminal groups, determines the LPO transmission opportunities to monitor based on a mapping that associates the terminals 20 in the subgroups that are further divided into the terminal groups with the multiple LPO groups into which the LPOs are classified, and monitors and receives the LP-WUS at the determined LPOs. The base station 10 may individually notify the terminal 20 of the terminal group to which the terminal 20 belongs and the number of LPO groups, or may notify the terminal 20 of the settings of the terminal groups and LPO groups (for example, to all terminals using broadcast information), or may define the combinations of the settings as a finite number of patterns and notify the terminal 20 of the numbers that identify the patterns. The terminal 20 also checks whether the designation information that specifies the terminal group that is the target of the wake-up instruction included in the received LP-WUS specifies the terminal identifier of the terminal itself.

[0054] In the following embodiments, similarly, the base station 10 transmits the LP-WUS based on the mapping of the terminal 20 (terminal identifier) ​​and the LPO group, and the terminal 20 monitors and receives the LP-WUS in the LPO.

[0055] Figures 11 and 12 are diagrams for explaining fourth and fifth examples, respectively, of UE group and LP-WUS mapping in an embodiment of the present invention. As shown in Figures 11 and 12, terminals 20 with terminal identifiers 1 to 30 are defined into two terminal groups: a first terminal group (terminal identifiers 1 to 5, 11 to 15, 21 to 25) and a second terminal group (terminal identifiers 6 to 10, 16 to 20, 26 to 30). Furthermore, based on the LPO arrangement, three types of LPO groups are defined: a first LPO group (solid line), a second LPO group (dashed line), and a third LPO group (dotted line). Furthermore, the subgroups of the first terminal group (terminal identifiers 1 to 5) and the subgroups of the second terminal group (terminal identifiers 6 to 10) are mapped to the first LPO group, the subgroups of the first terminal group (terminal identifiers 11 to 15) and the subgroups of the second terminal group (terminal identifiers 16 to 20) are mapped to the second LPO group, and the subgroups of the first terminal group (terminal identifiers 21 to 25) and the subgroups of the second terminal group (terminal identifiers 26 to 30) are mapped to the third LPO group.

[0056] Furthermore, the density of LPOs (the number of LPOs placed per time or period) in each LPO group is the same in both the examples of Figures 11 and 12. Furthermore, in the example of Figure 11, the LPOs in each LPO group are placed consecutively, while in the example of Figure 12, the LPOs are placed so that they are spaced evenly apart.

[0057] (Example 5a) Example 5a will be described. In Example 5a, similar to Example 4, two independent groups are defined: terminal groups obtained by dividing terminals 20 into a plurality of groups, and LPO groups obtained by classifying LPOs into a plurality of groups. Furthermore, terminals 20 in each terminal group are divided into subgroups, and the subgroups are mapped to different LPO groups. That is, terminals 20 in the same subgroup are mapped to the same LPO group. Here, in Example 5a, the range of terminal identifiers mapped to LPO groups may be uneven. That is, the number of terminal identifiers mapped may differ for each LPO group.

[0058] Figure 13 is a diagram for explaining a sixth example of mapping between UE groups and LP-WUSs in an embodiment of the present invention. As shown in Figure 13, two terminal groups are defined for terminals 20 with terminal identifiers of 1 to 30: a first terminal group (terminal identifiers 1 to 5, 11 to 15, and 21 to 25) and a second terminal group (terminal identifiers 6 to 10, 16 to 20, and 26 to 30). Furthermore, based on the arrangement of LPOs, three types of LPO groups are defined: a first LPO group (solid line), a second LPO group (dashed line), and a third LPO group (dotted line). Furthermore, the subgroups of the first terminal group (terminal identifiers 1 to 5, 11 to 15) and the subgroups of the second terminal group (terminal identifiers 6 to 10, 16 to 20) are mapped to the first LPO group, the subgroups of the first terminal group (terminal identifiers 21 to 25) are mapped to the second LPO group, and the subgroups of the second terminal group (terminal identifiers 26 to 30) are mapped to the third LPO group.

[0059] (Example 5b) Example 5b will be described. In Example 5b, similar to Example 4, two independent groups are defined: terminal groups obtained by dividing terminals 20 into a plurality of groups, and LPO groups obtained by classifying LPOs into a plurality of groups. Furthermore, terminals 20 in each terminal group are divided into subgroups, and the subgroups are mapped to different LPO groups. That is, terminals 20 in the same subgroup are mapped to the same LPO group. Here, in Example 5b, a terminal identifier may be mapped to a plurality of LPO groups.

[0060] Figure 14 is a diagram for explaining a seventh example of mapping between UE groups and LP-WUSs in an embodiment of the present invention. As shown in Figure 14, two terminal groups are defined for terminals 20 with terminal identifiers 1 to 30: a first terminal group (terminal identifiers 1 to 5, 11 to 15, 21 to 25) and a second terminal group (terminal identifiers 6 to 10, 16 to 20, 26 to 30). Furthermore, based on the LPO arrangement, three types of LPO groups are defined: a first LPO group (solid line), a second LPO group (dashed line), and a third LPO group (dotted line). Here, all terminal identifiers 1 to 30 are mapped to the first LPO group. Furthermore, the subgroups of the first terminal group (terminal identifiers 1-5, 11-15) and the subgroups of the second terminal group (terminal identifiers 6-10) are mapped to the second LPO group, and the subgroups of the first terminal group (terminal identifiers 21-25) and the subgroups of the second terminal group (terminal identifiers 16-20, 26-30) are mapped to the third LPO group. In other words, terminal 20 (terminal identifier) ​​is mapped to multiple LPO groups, including the first LPO group, the second LPO group, and the third LPO group. This makes it possible to set and use, for example, an LPO that is to be monitored by all terminals and an LPO that is to be monitored by only some terminals.

[0061] (Example 6) Example 6 will be described. In Example 6, similar to Example 4, two independent groups are defined: terminal groups, which are obtained by dividing terminals 20 into multiple groups, and LPO groups, which are obtained by classifying LPOs into multiple groups. Furthermore, terminals 20 in each terminal group are divided into subgroups, and the subgroups are mapped to different LPO groups. That is, terminals 20 in the same subgroup are mapped to the same LPO group. Here, in Example 6, LPO groups with different densities (number of LPOs placed per time or period) may be mapped for each terminal 20 (terminal identifier).

[0062] 15 and 16 are diagrams illustrating eighth and ninth examples of UE group and LP-WUS mapping, respectively, in an embodiment of the present invention. As shown in FIGS. 15 and 16, two terminal groups are defined for terminals 20 with terminal identifiers of 1 to 30: a first terminal group (terminal identifiers 1 to 5, 11 to 15, 21 to 25) and a second terminal group (terminal identifiers 6 to 10, 16 to 20, 26 to 30). Furthermore, based on the LPO placement, three types of LPO groups are defined: a first LPO group (solid line), a second LPO group (dashed line), and a third LPO group (dotted line). Here, the density of the placed LPOs increases in the order of the first LPO group, the second LPO group, and the third LPO group. Furthermore, the subgroups of the first terminal group (terminal identifiers 1 to 5) and the subgroups of the second terminal group (terminal identifiers 6 to 10) are mapped to the first LPO group, the subgroups of the first terminal group (terminal identifiers 11 to 15) and the subgroups of the second terminal group (terminal identifiers 16 to 20) are mapped to the second LPO group, and the subgroups of the first terminal group (terminal identifiers 21 to 15) and the subgroups of the second terminal group (terminal identifiers 26 to 30) are mapped to the third LPO group. Also, in the example of Figure 15, the LPOs of each LPO group are arranged consecutively, and in the example of Figure 16, the LPOs are arranged so that they are evenly spaced.

[0063] (Example 7) Example 6 will be described. In Example 6, similar to Example 4, two independent groups are defined: terminal groups obtained by dividing terminals 20 into a plurality of groups, and LPO groups obtained by classifying LPOs into a plurality of groups. Furthermore, terminals 20 in each terminal group are divided into subgroups, and the subgroups are mapped to different LPO groups. That is, terminals 20 in the same subgroup are mapped to the same LPO group. Here, in Example 7, terminal identifiers may be divided unevenly at any interval and divided into terminal groups. Furthermore, the number of terminal identifiers included in each terminal group may differ.

[0064] 17 is a diagram illustrating a tenth example of mapping between UE groups and LP-WUSs in an embodiment of the present invention. As shown in FIG. 17, for terminals 20 with terminal identifiers of 1 to 32, four terminal groups are defined: a first terminal group (terminal identifiers 1 to 8, 17 to 20), a second terminal group (terminal identifiers 9 to 13, 21 to 24), a third terminal group (terminal identifiers 14 to 15, 25 to 28), and a fourth terminal group (terminal identifiers 16, 29 to 32). Furthermore, based on the LPO arrangement, two types of LPO groups are defined: a first LPO group (solid line) and a second LPO group (dashed line). In this way, terminal identifiers may be divided unevenly at any interval and then divided into terminal groups. Furthermore, the number of terminal identifiers included in each terminal group may differ.

[0065] Furthermore, in order to identify the terminal identifier for which a wake-up command has been issued, the terminal 20 may receive information regarding division of the terminal group from the base station 10. This information may be, for example, information specifying a predetermined division pattern. Alternatively, the division method may be determined to be one pattern according to specifications.

[0066] Alternatively, the number of divisions based on the LPO arrangement (the number of LPO groups) and the number of divisions of the terminal identifier (the number of terminal groups) may be specified independently, and the terminal 20 may identify the terminal identifier for which a wake-up command has been issued based on the combination of the two specified division numbers. Here, the base station 10 may transmit information related to the two division numbers to the terminal 20 by a broadcast signal and / or RRC signaling, etc. Alternatively, the two division numbers may be statically fixed in the specifications. Alternatively, for example, the number of divisions of the terminal identifier may be fixed in the specifications, and the base station 10 may notify the terminal 20 of only the division number based on the LPO arrangement. This makes it possible to fix the size of the information for identifying the terminal identifier in the LP-WUS, thereby fixing the payload size and optimizing the number of terminals per LPO.

[0067] Alternatively, the two division numbers may be dynamically set, and the base station 10 may instruct the terminal 20 to change the setting of the division number for MR or LP-WUR.

[0068] (Embodiment 8) An embodiment 8 will be described. In embodiment 8, similar to embodiment 4, two independent groups are defined: terminal groups obtained by dividing terminals 20 into a plurality of groups, and LPO groups obtained by classifying LPOs into a plurality of groups. Furthermore, terminals 20 in each terminal group are divided into subgroups, and the subgroups are mapped to different LPO groups. That is, terminals 20 in the same subgroup are mapped to the same LPO group. Here, in embodiment 8, the base station 10 and terminals 20 may determine the number of terminal groups or the number of LPO groups based on the other number. For example, the product of the number of terminal groups and the number of LPO groups may be set to a fixed value, and the terminal 20 may determine the other number based on the fixed value and one of the values ​​received from the base station 10. Furthermore, the terminal 20 may determine the terminal group and LPO group to which its own terminal identifier is mapped by specifying a predetermined mapping method based on the number of terminal groups and the number of LPO groups, and perform LPO monitoring and LP-WUS reception.

[0069] 18 is a diagram illustrating an eleventh example of mapping between UE groups and LP-WUSs in an embodiment of the present invention. As shown in FIG. 18, for terminals 20 with terminal identifiers of 1 to 32, four terminal groups are defined: a first terminal group (terminal identifiers 1 to 8, 17 to 20), a second terminal group (terminal identifiers 5 to 8, 21 to 24), a third terminal group (terminal identifiers 9 to 12, 24 to 28), and a fourth terminal group (terminal identifiers 13 to 16, 29 to 32). Furthermore, based on the LPO arrangement, two types of LPO groups are defined: a first LPO group (solid line) and a second LPO group (dashed line). Here, a fixed value (=8) is predetermined as the product of the number of terminal groups and the number of LPO groups. Thus, for example, when the base station 10 notifies the terminal 20 of the number of terminal groups (=4), the terminal 20 can determine the number of LPO groups (=2) based on the predetermined value (=8) and the notified number of terminal groups (=4).

[0070] 19 is a diagram illustrating a twelfth example of mapping between UE groups and LP-WUSs in an embodiment of the present invention. As shown in FIG. 19, two terminal groups are defined for terminals 20 with terminal identifiers of 1 to 32: a first terminal group (terminal identifiers 1 to 4, 9 to 12, 17 to 20, 25 to 28) and a second terminal group (terminal identifiers 5 to 8, 13 to 16, 21 to 24, 29 to 32). Furthermore, based on the LPO arrangement, four types of LPO groups are defined: a first LPO group (solid line), a second LPO group (dashed line), a third LPO group (dotted line), and a fourth LPO group (dash-dotted line). Here, a fixed value (=8) is predetermined as the product of the number of terminal groups and the number of LPO groups. As a result, for example, when base station 10 notifies terminal 20 of the number of LPO groups (= 4), terminal 20 can determine the number of terminal groups (= 2) based on a predetermined value (= 8) and the notified number of LPO groups (= 4).

[0071] The above-described embodiment enables efficient mapping of terminals and low-power wake-up signals (LP-WUS) in a wireless communication system, and also enables restriction of the amount of LP-WUS data and grouping of terminals according to traffic density.

[0072] (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.

[0073] <Base Station 10> Figure 20 is a diagram showing an example of the functional configuration of the base station 10 in an embodiment of the present invention. As shown in Figure 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 Figure 20 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] <Terminal 20> Fig. 21 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. 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 operations related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0078] 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.

[0079] 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.

[0080] (Hardware Configuration) The block diagrams (FIGS. 20 and 21) 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.

[0081] 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.

[0082] 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. 22 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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. 20 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. 21 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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).

[0091] 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.

[0092] 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.

[0093] 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 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.

[0094] 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.

[0095] 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).

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] <Configuration Related to the Present Embodiment> (Clause 1) A terminal having: a control unit that divides terminals that receive a low power wakeup signal into a plurality of terminal groups, and determines a transmission opportunity of the low power wakeup signal to monitor based on a mapping that associates terminals in subgroups obtained by further dividing the terminal groups with a plurality of transmission opportunity groups into which transmission opportunities for the low power wakeup signal are classified; and a receiving unit that monitors and receives the low power wakeup signal at the determined transmission opportunity. (Clause 2) The terminal described in clause 1, in which a different number of terminals are associated with each transmission opportunity group, or the same terminal is associated with a plurality of the transmission opportunity groups. (Clause 3) The terminal described in clause 1, in which a different number of transmission opportunities are allocated per time for each transmission opportunity group, or in which a different number of terminals are included in each terminal group. (Clause 4) The terminal described in clause 1, in which the control unit determines the number of transmission opportunity groups based on the notified number of terminal groups, or determines the number of terminal groups based on the notified number of transmission opportunity groups. (Clause 5) A base station comprising: a control unit that divides terminals that receive a low power wakeup signal into a plurality of terminal groups, and determines a transmission opportunity for the low power wakeup signal based on a mapping that associates terminals in subgroups obtained by further dividing the terminal groups with a plurality of transmission opportunity groups into which transmission opportunities for the low power wakeup signal are classified, and a transmitter that transmits the low power wakeup signal at the determined transmission opportunity. (Clause 6) A communication method executed by a terminal comprising: a step of dividing terminals that receive a low power wakeup signal into a plurality of terminal groups, and determining a transmission opportunity for the low power wakeup signal to monitor based on a mapping that associates terminals in subgroups obtained by further dividing the terminal groups with a plurality of transmission opportunity groups into which transmission opportunities for the low power wakeup signal are classified, and a step of monitoring and receiving the low power wakeup signal at the determined transmission opportunity.

[0104] Any of the above configurations allows efficient mapping of terminals and LP-WUS transmission opportunities in transmitting and receiving low power wake-up signals (LP-WUS).

[0105] (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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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).

[0110] 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.

[0111] 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.

[0112] In the present disclosure, the determination may be made by a value represented by one bit (0 or 1), by a Boolean value (true or false), or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0131] 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."

[0132] 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.

[0133] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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."

[0153] 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.

[0154] 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.

[0155] 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."

[0156] 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).

[0157] 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.

[0158] 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 divides terminals that receive a low power wakeup signal into multiple terminal groups, and determines a transmission opportunity for the low power wakeup signal to monitor based on a mapping that associates terminals in subgroups that are further divided into the terminal groups with multiple transmission opportunity groups into which transmission opportunities for the low power wakeup signal are classified; and a receiving unit that monitors and receives the low power wakeup signal at the determined transmission opportunity.

2. The terminal according to claim 1, wherein the number of terminals associated with each of the transmission opportunity groups is different, or the same terminal is associated with a plurality of the transmission opportunity groups.

3. The terminal according to claim 1, wherein the number of transmission opportunities allocated per time varies for each of the transmission opportunity groups, or the number of terminals included in each of the terminal groups varies.

4. The terminal according to claim 1, wherein the control unit determines the number of transmission opportunity groups based on the notified number of terminal groups, or determines the number of terminal groups based on the notified number of transmission opportunity groups.

5. A base station having: a control unit that divides terminals that receive a low power wakeup signal into a plurality of terminal groups, and determines a transmission opportunity for the low power wakeup signal based on a mapping that associates terminals in subgroups that are further divided into the terminal groups with a plurality of transmission opportunity groups into which transmission opportunities for the low power wakeup signal are classified; and a transmission unit that transmits the low power wakeup signal at the determined transmission opportunity.

6. A communication method executed by a terminal, comprising: a step of dividing terminals that receive a low power wakeup signal into a plurality of terminal groups, and determining a transmission opportunity for the low power wakeup signal to monitor based on a mapping that associates terminals in subgroups obtained by further dividing the terminal groups with a plurality of transmission opportunity groups into which transmission opportunities for the low power wakeup signal are classified; and a step of monitoring and receiving the low power wakeup signal at the determined transmission opportunity.

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