Terminal and communication method

Abstract

This terminal comprises: a reception unit that executes monitoring of a low power wake-up signal from a base station; and a control unit that determines a method to be applied to the low power wake-up signal, on the basis of at least either instruction information indicating the method to be applied to the low power wake-up signal from the base station or a terminal capability of the terminal related to the method to be applied to the low power wake-up signal. The control unit controls the monitoring on the basis of the determined method. The method is a bitmap method or a code point method.

Description

Terminal and Communication Method

[0001] The present invention relates to a terminal and a communication method in a wireless communication system.

[0002] In 3GPP (Registered Trademark) (3rd Generation Partnership Project), it is being discussed which of the bitmap method or the code point method should be applied to LP-WUS (Low Power Wake-Up Signal). These methods have different advantages, for example, in terms of the size of overhead, ease of design, ease of resource management, and energy efficiency. Therefore, it is possible that LP-WUS supports both the bitmap method and the code point method, or different methods are used in the RRC CONNECTED (connected) state and the RRC IDLE (idle) / INACTIVE (inactive) state.

[0003] 3GPP TS 38.300 V18.4.0 (2024-12)3GPP TS 38.401 V18.4.0(2024-12)

[0004] However, conventionally, it has not been clearly defined how to set the method used by LP-WUS in the terminal or how to switch between the two methods. Therefore, there is a possibility that the terminal may not be able to appropriately perform LP-WUS monitoring and receive LP-WUS.

[0005] The terminal in the present embodiment includes a receiving unit that monitors a low-power wake-up signal from a base station, and a control unit that determines a method applied to the low-power wake-up signal from the base station based on at least one of indication information indicating the method applied to the low-power wake-up signal from the base station or the terminal capabilities regarding the method applied to the low-power wake-up signal possessed by the terminal. The control unit controls the monitoring based on the determined method, and the method is a bitmap method or a code point method.

[0006] According to this embodiment, it is possible to appropriately monitor the low-power wake-up signal depending on the method applied to the low-power wake-up signal.

[0007] This diagram illustrates the wireless communication system in this embodiment. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 1-1. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 1-2. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 1-3. This is a sequence diagram showing an example of the operation of a terminal and base station in modified versions of Examples 1-2 and 1-3. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 1-4. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 2-1. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 2-2. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 2-3. This is a sequence diagram showing an example of the operation of a terminal and base station in modified versions of Examples 2-2 and 2-3. This is a sequence diagram showing an example of the operation of a terminal and base station in Example 2-4. This is a diagram showing an example of the functional configuration of a base station in this embodiment. This is a diagram showing an example of the functional configuration of a terminal in this embodiment. This is a diagram showing an example of the hardware configuration of a base station or terminal in this embodiment. This is a diagram showing an example of the configuration of a vehicle in this embodiment.

[0008] This embodiment will be described below with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention applies are not limited to those described below.

[0009] The wireless communication system of this embodiment operates using existing technology. Existing technology is, for example, wireless communication technology based on communication standards such as the 3GPP standard. Existing technology is, for example, NR (New Radio), but is not limited to existing NR. As used herein, the term "NR" has a broad meaning that includes NR (5G) and later systems (e.g., 6G), unless otherwise specified.

[0010] In the embodiments described below, we will use 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 communication standards. This is for convenience of description, and similar signals, functions, etc., may be called by other names.

[0011] In this embodiment, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or any other method (for example, a Flexible Duplex).

[0012] In this embodiment, "configuring" wireless parameters means that predetermined values ​​are pre-configured, or that wireless parameters notified by the base station 10 or terminal 20 are configured.

[0013] Figure 1 shows an example of the configuration of a wireless communication system in this embodiment. The wireless communication system in this embodiment includes a base station 10 and a terminal 20, as shown in Figure 1. Although Figure 1 shows one base station 10 and one terminal 20, this is an example, and there may be multiple base stations 10 and terminal 20.

[0014] Base station 10 is a communication device that provides one or more cells and communicates wirelessly with terminal 20. The physical resources of the radio signal are defined in the time domain and the frequency domain. 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 resource blocks. Base station 10 transmits synchronization signals and system information to terminal 20. Synchronization signals are, for example, PSS and SSS. System information is transmitted, for example, via PBCH and is also called broadcast information. Synchronization signals and system information may be called SSB (SS / PBCH block). As shown in Figure 1, base station 10 transmits control signals or data to terminal 20 via DL (Downlink) and receives control signals or data from terminal 20 via UL (Uplink). Both base station 10 and terminal 20 are capable of transmitting and receiving signals using beamforming. Furthermore, both base station 10 and terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via secondary cells (SCell) and primary cells (PCell) using Carrier Aggregation (CA). In addition, the terminal 20 may communicate via the primary cell of base station 10 and the primary secondary cell group cell (PSCell) of other base stations 10 using Dual Connectivity (DC).

[0015] Terminal 20 is a communication device equipped with wireless communication capabilities, such as a smartphone, mobile phone, tablet, wearable device, or M2M (Machine-to-Machine) communication module. As shown in Figure 1, 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. Terminal 20 also receives various reference signals transmitted from the base station 10 and performs propagation path quality measurements based on the reception results of these reference signals.

[0016] The terminal 20 in this embodiment may be, for example, an LP-WUR or an OFDM-based LP-WUR. An OFDM-based LP-WUR is a low-power wake-up receiver that receives LP-WUS using OFDM technology. The OFDM-based LP-WUR receives information using an OFDM sequence overlaid on an OOK "ON" symbol.

[0017] In the following explanation, " / " means "and / or" unless otherwise specified, or unless the context makes it clear that it has a different meaning.

[0018] Within 3GPP, there is ongoing discussion about whether to apply the bitmap method or the code point method to LP-WUS.

[0019] In the bitmap scheme, each bit corresponds to one or more terminals, and variations exist at the bit level, bitmap level, and with CRC. In the codepoint scheme, each codepoint corresponds to one or more terminals, and mappings exist for one-to-one, one-to-all, and one-to-X (1 < X < L). The characteristics of the bitmap scheme and the codepoint scheme are shown below.

[0020] For example, the bitmap method has a low false alarm rate and high power efficiency, but it can be less energy efficient because the base station needs to transmit all bits. On the other hand, the codepoint method improves the energy efficiency of the base station because it does not need to transmit unnecessary bits when paging is not performed to the terminal, but it can be more false alarm than the bitmap method.

[0021] For example, the bitmap method uses fewer MOs (Monitoring Occasions), making resource management easier, especially in a TDD environment. On the other hand, the code point method allows for more flexible link adaptation, but it uses more MOs, potentially complicating resource management.

[0022] For example, the bitmap method has a simple design, easy receiving processing on the terminal side, and only requires monitoring a single MO. On the other hand, the codepoint method has a more complex design and requires monitoring multiple MOs, which can increase the burden on the terminal.

[0023] For example, the bitmap method is advantageous when the probability of traffic arrival is moderate to high, and it can reduce overhead because it uses fewer MOs. On the other hand, the codepoint method allows for adaptive link design for each terminal and enables early termination of LP-WUS detection, but it tends to use a large number of MOs.

[0024] Thus, these two methods have different advantages in terms of overhead size, ease of design, ease of resource management, and energy efficiency. For this reason, LP-WUS may support both bitmap and codepoint methods, or different methods may be used for the RRC CONNECTED state and the RRC IDLE / INACTIVE state.

[0025] However, it has not been clearly defined how to configure the terminal to use the method employed by LP-WUS, or how to switch between the two methods. As a result, terminals may not be able to properly perform LP-WUS monitoring or receive LP-WUS signals.

[0026] This embodiment provides a method by which terminal 20 in RRC CONNECTED mode or IDLE / INACTIVE mode determines the method used by LP-WUS and performs LP-WUS monitoring based on the determined method. Furthermore, this embodiment realizes a method for flexibly switching between multiple methods used by LP-WUS.

[0027] In this embodiment, LP-WUS uses either a bitmap method or a code point method. LP-WUS information, which indicates the content of LP-WUS, is represented using either a bitmap method or a code point method. The bitmap method and the code point method may collectively be referred to, for example, as an addressing method, encoding method, identification method, or signaling method.

[0028] The bitmap method is a method of representing LP-WUS information for each terminal as a bit sequence (bitmap). For example, if a certain bit is "1", a wake-up signal is sent to the corresponding terminal 20. Terminal 20 checks its corresponding bit and wakes up if it is "1".

[0029] The code point system is a method of identifying LP-WUS information using predefined code points (specific numerical values ​​or symbols). For example, when a particular code point is transmitted, the terminal interprets which terminal it corresponds to.

[0030] For LP-WUS, CRC (Cyclic Redundancy Check) may be applied to perform error detection.

[0031] (Example 1) Example 1 shows a method for determining the method used by LP-WUS in RRC CONNECTED mode (e.g., bitmap method and code point method). Furthermore, it may be determined whether or not to apply CRC to the LP-WUS information.

[0032] (Example 1-1) According to Example 1-1, in RRC CONNECTED mode, whether the method applied to the LP-WUS information is a bitmap method or a code point method may be determined based on predefined rules (conditions).

[0033] Figure 2 is a sequence diagram showing an example of the operation of terminal 20 and base station 10 in Embodiment 1-1. As shown in Figure 2, in step S101, the state of terminal 20 is either in RRC CONNECTED mode or terminal 20 may transition to RRC CONNECTED mode. In step S102, base station 10 determines the method (bitmap method or code point method) to be used by LP-WUS based on predetermined rules. In step S103, base station 10 instructs terminal 20 to use the determined method for LP-WUS. In step S104, terminal 20 anticipates receiving LP-WUS information using the instructed method. In step S105, base station 10 transmits LP-WUS information using the determined method to terminal 20. Terminal 20 monitors the LP-WUS information transmitted from base station 10 based on the assumed method for LP-WUS and receives the LP-WUS information.

[0034] For example, based on the result of comparing predetermined parameters with thresholds, it may be determined whether the method applied to the LP-WUS information is a bitmap method or a code point method. The comparison of predetermined parameters with thresholds corresponds, for example, to the operation of the base station 10 in step S102 of Figure 2. However, the comparison of predetermined parameters with thresholds may be performed by the terminal 20.

[0035] The threshold "X" may be instructed or set by the base station 10 to the terminal 20, or it may be set based on the terminal UE capability (UE capability) of the terminal 20.

[0036] (Example 1-1-1) The predetermined parameter may be traffic probability. The method applied to the LP-WUS information may be determined based on the traffic probability of terminal 20 calculated for each C-DRX cycle of base station 10.

[0037] For example, when the traffic probability is low (e.g., 10% or less), it may be decided that the code point method should be applied to the LP-WUS information. When the traffic probability is moderate (e.g., higher than 10%) and high (e.g., higher than 30%), it may be decided that the bitmap method should be applied to the LP-WUS information.

[0038] (Example 1-1-2) The predetermined parameter may be the size of the UE group. The method applied to the LP-WUS information may be determined based on the size of the UE group.

[0039] For example, when the size of the UE group is small (e.g., 8 or less), it may be decided that the code point method should be applied to the LP-WUS information. When the size of the UE group is large (e.g., more than 8), it may be decided that the bitmap method should be applied to the LP-WUS information.

[0040] (Example 1-1-3) The predetermined parameter may be the false alarm rate (FAR). The method applied to the LP-WUS information may be determined based on the FAR. The FAR is calculated as False Alarms / Total Non-Event Trials (number of trials without actual events).

[0041] For example, if the false activation rate is high (e.g., above a predetermined threshold), it may be decided that the bitmap method should be applied to the LP-WUS information. If the false activation rate is low (e.g., below a predetermined threshold), it may be decided that the code point method should be applied to the LP-WUS information.

[0042] (Example 1-1-4) The predetermined parameter may be a DRX cycle. The method applied to the LP-WUS information may be determined based on the length of the C-DRX cycle of the terminal 20.

[0043] For example, when the C-DRX cycle is long (e.g., when it is greater than or equal to a predetermined threshold), it may be determined that the bitmap method is applied to the LP-WUS information. When the C-DRX cycle is short (e.g., when it is less than the predetermined threshold), it may be determined that the code point method is applied to the LP-WUS information.

[0044] (Example 1-1-5) The predetermined parameter may be a communication quality indicator (radio environment indicator) (e.g., RSRP, SINR, RSSI, RSRQ). The method applied to the LP-WUS information may be determined based on the communication quality indicator received by the terminal 20.

[0045] For example, when the communication quality is good (e.g., RSRP is greater than or equal to a predetermined threshold), it may be determined that the code point method without CRC application is applied to the LP-WUS information. When the communication quality is poor (e.g., RSRP is less than the threshold), it may be determined that the bitmap method is applied to the LP-WUS information with CRC application.

[0046] (Example 1-1-6) The predetermined parameter may be the LP-WUS information bit length. The method applied to the LP-WUS information may be determined based on the LP-WUS information bit length estimated by the terminal 20 based on the signal transmitted by the base station 10.

[0047] For example, the signal transmitted from the base station 10 to the terminal 20 may indicate whether any one or any combination of the above Examples 1-1-1 to 1-6 should be applied, or may indicate whether to use either the bitmap method or the code point method.

[0048] (Example 1-2) According to Example 1-2, in the RRC CONNECTED mode, whether the method applied to the LP-WUS information is the bitmap method or the code point method may be set or instructed to the terminal 20 by a predetermined signal from the network (for example, the base station 10). The predetermined signal may be, for example, SIB (System Information Block), RRC (Radio Resource Control), MAC CE (Medium Access Control Control Element), or DCI (Downlink Control Information).

[0049] Figure 3 is a sequence diagram showing an example of the operations of the terminal 20 and the base station 10 in Example 1-2. As shown in Figure 3, in step S111, the state of the terminal 20 may be the RRC CONNECTED mode or the terminal 20 may transition to the RRC CONNECTED mode.

[0050] In step S112, the base station 10 transmits information (instruction information) indicating the method (bitmap method or code point method) used by the LP-WUS. With this instruction information, the method used by the LP-WUS can be flexibly switched.

[0051] In step S113, the terminal 20 assumes receiving the LP-WUS information using the instructed method. In step S114, the base station 10 transmits the LP-WUS information using the method instructed in step S112 to the terminal 20. The terminal 20 monitors the LP-WUS information transmitted from the base station 10 based on the assumed method used by the LP-WUS and receives the LP-WUS information.

[0052] Terminal 20 may assume by default that the method applied to LP-WUS information is either a bitmap method or a codepoint method. That is, a default value indicating whether the method applied to LP-WUS information is a bitmap method or a codepoint method may be set for terminal 20. This default value may be a value specified in advance by a specification (e.g., a 3GPP specification), or it may be set or instructed by base station 10 via SIB, RRC, MAC CE, or DCI.

[0053] (Examples 1-3) According to Examples 1-3, the method applied to the LP-WUS information may be determined based on the terminal capability (UE capability) of the terminal 20.

[0054] Figure 4 is a sequence diagram showing an example of the operation of terminal 20 and base station 10 in Embodiment 1-3. As shown in Figure 4, in step S121, the state of terminal 20 is either in RRC CONNECTED mode or terminal 20 may transition to RRC CONNECTED mode. In step S122, terminal 20 assumes the reception of LP-WUS information using a bitmap method or a code point method based on terminal capability information. In step S123, base station 10 transmits LP-WUS information using a bitmap method or a code point method to terminal 20. Terminal 20 monitors the LP-WUS information transmitted from base station 10 based on the assumed LP-WUS method and receives the LP-WUS information.

[0055] For example, terminal 20 may assume a preferred or preferred method (bitmap method or code point method) to be applied to LP-WUS information in its terminal capability. A preferred or preferred method for LP-WUS information to be applied to terminal 20 may be set as a parameter of terminal capability. Base station 10 may determine either the bitmap method or the code point method based on terminal capability, which indicates the method applied to the LP-WUS information reported by terminal 20. Base station 10 may set or instruct terminal 20 to use either the bitmap method or the code point method determined based on terminal capability via SIB, RRC, MAC CE, or DCI.

[0056] The terminal capability may include information indicating the method (bitmap method and / or code point method) applied to the LP-WUS information supported by terminal 20. If terminal 20 supports both the bitmap method and the code point method in its terminal capability, terminal 20 may operate according to any of the above embodiments 1-1, 1-2, or 1-4.

[0057] For example, terminal 20 may assume a method (bitmap method or code point method) to be applied to LP-WUS information based on the type of LP-WUS receiver included in the terminal capability. The type of LP-WUS receiver may be a type of reception method (e.g., OOK-based LR (Low-power Reception), OFDM-based LR). OOK-based LR is the lowest power reception method and is a reception method that uses the OOK method which employs ON / OFF signaling. OFDM-based LR is a reception method that uses the low-power OFDM method which provides more reliable communication than OOK. The type of LP-WUS receiver may be set as a parameter of the terminal capability of terminal 20. Base station 10 may determine either the bitmap method or the code point method to be applied to LP-WUS information based on the terminal capability indicating the type of LP-WUS receiver reported by terminal 20. Base station 10 may set or instruct terminal 20 to use the bitmap method or code point method determined based on the terminal capability via SIB, RRC, MAC CE, or DCI.

[0058] In Examples 1-3, terminal 20 may assume a default value for the method (bitmap method or code point method) applied to LP-WUS information based on terminal capabilities. That is, a default value for the method applied to LP-WUS information based on terminal capabilities may be set for terminal 20. The default value for the method applied to LP-WUS information based on terminal capabilities may be a value specified in advance by a specification (e.g., a 3GPP specification), or it may be set or instructed from base station 10 via SIB, RRC, MAC CE, or DCI.

[0059] The above-described embodiments 1-2 and 1-3 may be used in combination, as shown in Figure 5. In the example in Figure 5, in step S131, the state of terminal 20 may be in RRC CONNECTED mode or terminal 20 may transition to RRC CONNECTED mode.

[0060] In step S132, terminal 20 transmits terminal capability information to base station 10. Terminal capability information is at least one of the following: a format applicable to LP-WUS information supported by terminal 20 (bitmap format and / or code point format), a format applicable to LP-WUS information suitable for terminal 20, or a type of LP-WUS receiver.

[0061] In step S133, the base station 10 determines the method (bitmap method or code point method) to be used by the LP-WUS based on the terminal capability information. In step S134, the base station 10 transmits LP-WUS information using the method determined in step S133 to the terminal 20. In step S135, the base station 10 transmits LP-WUS information using the method determined in step S133 to the terminal 20. The terminal 20 monitors the LP-WUS information transmitted from the base station 10 based on the assumed method used by the LP-WUS and receives the LP-WUS information.

[0062] (Examples 1-4) According to Examples 1-4, the method (bitmap method or code point method) applied to LP-WUS information based on terminal capabilities may be determined based on a predetermined timer.

[0063] Figure 6 is a sequence diagram showing an example of the operation of terminal 20 and base station 10 in Embodiment 1-4. As shown in Figure 6, in step S141, the state of terminal 20 is either in RRC CONNECTED mode or terminal 20 may transition to RRC CONNECTED mode. In step S142, terminal 20 switches the method (bitmap method or code point method) applied to the LP-WUS information based on a predetermined timer. Terminal 20 assumes the reception of LP-WUS information using the switched method. In step S143, base station 10 transmits LP-WUS information using the bitmap method or code point method to terminal 20. Terminal 20 monitors the LP-WUS information transmitted from base station 10 based on the method used by the assumed LP-WUS and receives the LP-WUS information.

[0064] (Example 1-4-1) According to Example 1-4-1, a switching timer may be specified in terminal 20 to switch whether to default to the bitmap method or the code point method. The switching timer may be notified to terminal 20 from the network (base station 10) or may be specified by a specification (e.g., 3GPP specification).

[0065] (Example 1-4-2) According to Example 1-4-2, a bitmap / codepoint switching timer is provided to switch between the bitmap method and the codepoint method set in the terminal 20.

[0066] The default value of the bitmap / codepoint switching timer may be notified to the terminal 20 from the network (base station 10), or it may be specified by a specification (e.g., a 3GPP specification).

[0067] The bitmap / code point switching timer may be determined based on the DRX (Discontinuous Reception) cycle.

[0068] For example, the validity period "Y" of the bitmap / codepoint switching timer may be determined based on the formula Y = DRX cycles / X. In this formula, the DRX cycles may be different depending on the IDLE / INACTIVE / CONNECTED mode. "X" may be any value, for example, 1, 2, 4, or 8. The value of "X" may be notified from the network (base station 10) to the terminal 20, or it may be specified by a specification (e.g., a 3GPP specification).

[0069] (Example 1-4-3) Example 1-4-3 defines the trigger conditions for the switching timers in Examples 1-4-1 and 1-4-2.

[0070] The trigger for activating the timer function may be, for example, a signal transmitted from the network (base station 10) to the terminal 20, or it may be the detection of a change in the SSB index measured by RRM (Radio Resource Management) due to a change in the beam.

[0071] The trigger for disabling the timer function may be, for example, a signal transmitted from the network (base station 10) to the terminal 20.

[0072] Thus, according to Embodiment 1, the terminal 20 in RRC CONNECTED mode can determine (assume) the method used by LP-WUS (for example, bitmap method and code point method), and perform LP-WUS monitoring based on the determined method. Furthermore, according to Embodiment 1, it is possible to flexibly switch between multiple methods used by LP-WUS.

[0073] (Example 2) Example 2 shows a method for determining the method (e.g., bitmap method and code point method) used by LP-WUS in RRC IDLE / INACTIVE. Furthermore, it may be determined whether or not CRC is applied to the LP-WUS information.

[0074] (Example 2-1) According to Example 2-1, in RRC IDLE / INACTIVE mode, whether the method applied to the LP-WUS information is a bitmap method or a code point method may be determined based on predefined rules (conditions).

[0075] Figure 7 is a sequence diagram showing an example of the operation of terminal 20 and base station 10 in Embodiment 2-1. As shown in Figure 7, in step S201, the state of terminal 20 is either RRC IDLE / INACTIVE mode or terminal 20 may transition to RRC IDLE / INACTIVE mode. In step S202, base station 10 determines the method (bitmap method or code point method) to be used by LP-WUS based on predetermined rules. In step S203, base station 10 instructs terminal 20 to use the determined method for LP-WUS. In step S204, terminal 20 anticipates receiving LP-WUS information using the instructed method. In step S205, base station 10 transmits LP-WUS information using the determined method to terminal 20. Terminal 20 monitors the LP-WUS information transmitted from base station 10 based on the assumed method for LP-WUS and receives the LP-WUS information.

[0076] For example, based on the result of comparing predetermined parameters with thresholds, it may be determined whether the method applied to the LP-WUS information is a bitmap method or a code point method. The comparison of predetermined parameters with thresholds corresponds, for example, to the operation of the base station 10 in step S202 of Figure 7. However, the comparison of predetermined parameters with thresholds may be performed by the terminal 20.

[0077] The threshold "X" may be instructed or set by the base station 10 to the terminal 20, or it may be set based on the terminal UE capability (UE capability) of the terminal 20.

[0078] (Example 2-1-1) The predetermined parameter may be the paging rate for each subgroup. The method applied to the LP-WUS information may be determined based on the paging rate for each subgroup.

[0079] For example, if the paging rate for each subgroup is low (e.g., 1% or less), it may be decided that the code point method should be applied to the LP-WUS information. If the paging rate for each subgroup is high (e.g., greater than 1%), it may be decided that the bitmap method should be applied to the LP-WUS information.

[0080] (Example 2-1-2) The predetermined parameter may be the size of the UE group. The method applied to the LP-WUS information may be determined based on the size of the UE group.

[0081] For example, when the size of the UE group is small (e.g., 8 or less), it may be decided that the code point method should be applied to the LP-WUS information. When the size of the UE group is large (e.g., more than 8), it may be decided that the bitmap method should be applied to the LP-WUS information.

[0082] (Example 2-1-3) The predetermined parameter may be the false alarm rate (FAR). The method applied to the LP-WUS information may be determined based on the FAR. The FAR is calculated as False Alarms / Total Non-Event Trials (number of trials without actual events).

[0083] For example, if the false activation rate is high (e.g., above a predetermined threshold), it may be decided that the bitmap method should be applied to the LP-WUS information. If the false activation rate is low (e.g., below a predetermined threshold), it may be decided that the code point method should be applied to the LP-WUS information.

[0084] (Example 2-1-4) The predetermined parameter may be the DRX cycle. The method applied to the LP-WUS information may be determined based on the length of the C-DRX cycle of terminal 20.

[0085] For example, if the C-DRX cycle is long (e.g., above a predetermined threshold), it may be determined that a bitmap method is applied to the LP-WUS information. If the C-DRX cycle is short (e.g., below a predetermined threshold), it may be determined that a code point method is applied to the LP-WUS information.

[0086] (Example 2-1-5) The predetermined parameters may be communication quality indicators (wireless environment indicators) (e.g., RSRP, SINR, RSSI, RSRQ). The method applied to the LP-WUS information may be determined based on the communication quality indicators received by the terminal 20.

[0087] For example, if the communication quality is good (e.g., RSRP is above a predetermined threshold), it may be decided that a code point scheme without CRC application is applied to the LP-WUS information. If the communication quality is poor (e.g., RSRP is below a threshold), it may be decided that a bitmap scheme with CRC application is applied to the LP-WUS information.

[0088] (Example 2-1-6) The predetermined parameter may be the LP-WUS information bit length. The method applied to the LP-WUS information may be determined based on the bit length of the LP-WUS information estimated by the terminal 20 based on the signal transmitted by the base station 10.

[0089] For example, the signal transmitted from the base station 10 to the terminal 20 may indicate whether any of the above embodiments 2-1-1 to 1-6 or any combination thereof should be applied, or it may indicate whether to use a bitmap scheme or a code point scheme.

[0090] (Example 2-2) According to Example 2-2, in RRC IDLE / INACTIVE mode, whether the method applied to LP-WUS information is a bitmap method or a code point method may be set or instructed to the terminal 20 by a predetermined signal from the network (e.g., base station 10). The predetermined signal may be, for example, SIB, RRC, MAC CE, or DCI.

[0091] Figure 8 is a sequence diagram showing an example of the operation of terminal 20 and base station 10 in Embodiment 2-2. As shown in Figure 8, in step S211, the state of terminal 20 may be RRC IDLE / INACTIVE mode or terminal 20 may transition to RRC IDLE / INACTIVE mode.

[0092] In step S212, the base station 10 transmits information (instruction information) indicating the method used by LP-WUS (bitmap method or code point method). This instruction information allows for flexible switching of the method used by LP-WUS.

[0093] In step S213, terminal 20 anticipates receiving LP-WUS information using the instructed method. In step S214, base station 10 transmits LP-WUS information to terminal 20 using the method instructed in step S212. Terminal 20 monitors the LP-WUS information transmitted from base station 10 based on the assumed LP-WUS method and receives the LP-WUS information.

[0094] Terminal 20 may assume by default that the method applied to LP-WUS information is either a bitmap method or a codepoint method. That is, a default value indicating whether the method applied to LP-WUS information is a bitmap method or a codepoint method may be set for terminal 20. This default value may be a value specified in advance by a specification (e.g., a 3GPP specification), or it may be set or instructed by base station 10 via SIB, RRC, MAC CE, or DCI.

[0095] (Example 2-3) According to Example 2-3, the method applied to the LP-WUS information may be determined based on the terminal capability (UE capability) of the terminal 20.

[0096] Figure 11 is a sequence diagram showing an example of the operation of terminal 20 and base station 10 in Embodiment 2-3. As shown in Figure 11, in step S221, the state of terminal 20 is either RRC IDLE / INACTIVE mode or terminal 20 may transition to RRC IDLE / INACTIVE mode. In step S222, terminal 20 assumes the reception of LP-WUS information using a bitmap method or a code point method based on terminal capability information. In step S223, base station 10 transmits LP-WUS information using a bitmap method or a code point method to terminal 20. Terminal 20 monitors the LP-WUS information transmitted from base station 10 based on the assumed LP-WUS method and receives the LP-WUS information.

[0097] For example, terminal 20 may assume a preferred or preferred method (bitmap method or code point method) to be applied to LP-WUS information in its terminal capability. A preferred or preferred method for LP-WUS information to be applied to terminal 20 may be set as a parameter of terminal capability. Base station 10 may determine either the bitmap method or the code point method based on terminal capability, which indicates the method applied to the LP-WUS information reported by terminal 20. Base station 10 may set or instruct terminal 20 to use either the bitmap method or the code point method determined based on terminal capability via SIB, RRC, MAC CE, or DCI.

[0098] The terminal capability may include information indicating the method (bitmap method and / or code point method) applied to the LP-WUS information supported by terminal 20. If terminal 20 supports both the bitmap method and the code point method in its terminal capability, terminal 20 may operate according to any of the above embodiments 2-1, 1-2, or 1-4.

[0099] For example, terminal 20 may assume a method (bitmap method or codepoint method) to be applied to LP-WUS information based on the type of LP-WUS receiver included in the terminal capability. The type of LP-WUS receiver may be a type of receiving method (e.g., OOK-based LR, OFDM-based LR). The type of LP-WUS receiver may be set as a parameter of the terminal capability that terminal 20 possesses. Base station 10 may determine either a bitmap method or a codepoint method as the method to be applied to LP-WUS information based on the terminal capability indicating the type of LP-WUS receiver reported by terminal 20. Base station 10 may set or instruct terminal 20 to use the bitmap method or codepoint method determined based on the terminal capability via SIB, RRC, MAC CE, or DCI.

[0100] In Example 2-3, terminal 20 may assume a default value for the method (bitmap method or code point method) applied to LP-WUS information based on terminal capabilities. That is, a default value for the method applied to LP-WUS information based on terminal capabilities may be set for terminal 20. The default value for the method applied to LP-WUS information based on terminal capabilities may be a value specified in advance by a specification (e.g., a 3GPP specification), or it may be set or instructed from base station 10 via SIB, RRC, MAC CE, or DCI.

[0101] The above-described embodiments 2-2 and 2-3 may be used in combination, as shown in Figure 10. In the example in Figure 10, in step S231, the state of terminal 20 may be in RRC IDLE / INACTIVE mode or terminal 20 may transition to RRC IDLE / INACTIVE mode.

[0102] In step S232, terminal 20 transmits terminal capability information to base station 10. Terminal capability information is at least one of the following: a format applicable to LP-WUS information supported by terminal 20 (bitmap format and / or code point format), a format applicable to LP-WUS information suitable for terminal 20, or a type of LP-WUS receiver.

[0103] In step S233, the base station 10 determines the method (bitmap method or code point method) to be used by LP-WUS based on terminal capability information. In step S234, the base station 10 transmits LP-WUS information using the method determined in step S233 to the terminal 20. In step S235, the base station 10 transmits LP-WUS information using the method determined in step S233 to the terminal 20. The terminal 20 monitors the LP-WUS information transmitted from the base station 10 based on the assumed method used by LP-WUS and receives the LP-WUS information.

[0104] (Example 2-4) According to Example 2-4, the method (bitmap method or code point method) applied to LP-WUS information based on terminal capabilities may be determined based on a predetermined timer.

[0105] Figure 9 is a sequence diagram showing an example of the operation of terminal 20 and base station 10 in Embodiment 2-4. As shown in Figure 9, in step S241, the state of terminal 20 is either RRC IDLE / INACTIVE mode or terminal 20 may transition to RRC IDLE / INACTIVE mode. In step S242, terminal 20 switches the method (bitmap method or code point method) applied to the LP-WUS information based on a predetermined timer. Terminal 20 assumes to receive LP-WUS information using the switched method. In step S243, base station 10 transmits LP-WUS information using the bitmap method or code point method to terminal 20. Terminal 20 monitors the LP-WUS information transmitted from base station 10 based on the method used by the assumed LP-WUS and receives the LP-WUS information.

[0106] (Example 2-4-1) According to Example 2-4-1, a switching timer may be specified in the terminal 20 to switch whether to default to the bitmap method or the code point method. The switching timer may be notified to the terminal 20 from the network (base station 10) or may be specified by a specification (e.g., 3GPP specification).

[0107] (Example 2-4-2) According to Example 2-4-2, a bitmap / codepoint switching timer may be defined to switch between the bitmap method and the codepoint method set in the terminal 20.

[0108] The default value of the bitmap / codepoint switching timer may be notified to the terminal 20 from the network (base station 10), or it may be specified by a specification (e.g., a 3GPP specification).

[0109] The bitmap / code point switching timer may be determined based on the DRX cycle.

[0110] For example, the validity period "Y" of the bitmap / codepoint switching timer may be determined based on the formula Y = DRX cycles / X. In this formula, the DRX cycles may be different depending on the IDLE / INACTIVE / CONNECTED mode. "X" may be any value, for example, 1, 2, 4, or 8. The value of "X" may be notified from the network (base station 10) to the terminal 20, or it may be specified by a specification (e.g., a 3GPP specification).

[0111] (Example 2-4-3) Example 2-4-3 defines the trigger conditions for the switching timers in Examples 2-4-1 and 2-4-2.

[0112] The trigger for activating the timer function may be, for example, a signal transmitted from the network (base station 10) to the terminal 20, or it may be the detection of a change in the SSB index measured by RRM (Radio Resource Management) due to a change in the beam.

[0113] The trigger for disabling the timer function may be, for example, a signal transmitted from the network (base station 10) to the terminal 20.

[0114] Thus, according to Embodiment 2, the terminal 20 in RRC IDLE / INACTIVE mode can determine (assume) the method used by LP-WUS (for example, bitmap method and code point method), and perform LP-WUS monitoring based on the determined method. Furthermore, according to Embodiment 2, it is possible to flexibly switch between multiple methods used by LP-WUS.

[0115] (Device Configuration) Next, an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above will be explained. The base station 10 and terminal 20 include the functions to carry out the embodiments described above. However, the base station 10 and terminal 20 may each be equipped with only some of the functions in the embodiments.

[0116] <Base Station> Figure 12 shows an example of the functional configuration of the base station 10 in this embodiment. As shown in Figure 12, 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 12 is merely an example. Any functional classification and functional unit names are acceptable as long as they can perform the operations according to this embodiment.

[0117] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The transmitting unit 110 also transmits setting information, instructions, and notifications related to the low-power wake-up signal to the terminal 20. The transmitting unit 110 also transmits notifications to the terminal regarding the switching of monitoring operations. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining information from the received signals, for example, information from a higher layer. The transmitting unit 110 also has the function of transmitting PSS, SSS, PBCH, DL / UL control signals, etc. to the terminal 20. The receiving unit 120 also receives inter-network node messages from other network nodes.

[0118] The setting unit 130 stores pre-set setting information and various setting information to be transmitted to the terminal 20. The content of the setting information includes, for example, information related to measurements in low-power signals.

[0119] As described in the embodiment, the control unit 140 performs control related to setting, instructing, and notifying about low-power wake-up signals and the like. The signal transmission function unit of the control unit 140 may be included in the transmission unit 110, and the signal reception function unit of the control unit 140 may be included in the reception unit 120.

[0120] <Terminal> Figure 13 is a diagram showing an example of the functional configuration of terminal 20 in this embodiment. As shown in Figure 13, 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 Figure 13 is merely an example. Any functional classification and functional unit names are acceptable as long as they can perform the operations according to this embodiment. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as the communication unit.

[0121] 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 the low-power wake-up signal to the base station 10. The receiving unit 220 wirelessly receives various signals and acquires signals from higher layers from the received physical layer signals. The receiving unit 220 also has the 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, setting information, instructions, and notifications related to the low-power wake-up signal from the base station 10. For example, the receiving unit 220 receives the 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 pre-set setting information. The content of the setting information is, for example, information related to measurements in low-power signals.

[0122] As described in the embodiment, the control unit 240 performs control related to setting, instructing, and notifying of low-power wake-up signals. The signal transmission function unit of the control unit 240 may be included in the transmission unit 210, and the signal reception function unit of the control unit 240 may be included in the reception unit 220.

[0123] (Hardware Configuration) The block diagrams (Figures 12 and 13) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, 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 it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the above one device or the above multiple devices with software.

[0124] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0125] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 14 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to 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.

[0126] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0127] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of data reading and writing in the storage device 1002 and auxiliary storage device 1003.

[0128] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0129] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 12 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 13 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-described processes have been explained 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 also be transmitted from the network via a telecommunications line.

[0130] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of the present disclosure.

[0131] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc 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 multipurpose disk, a Blu-ray® disk), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0132] 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 a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmitting and receiving antenna, amplifier section, transmitting and receiving section, transmission path interface, etc., may be implemented by the communication device 1004. The transmitting and receiving section may be implemented in a physically or logically separated manner, with a transmitting section and a receiving section.

[0133] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0134] 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 different buses may be configured for each device.

[0135] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0136] Figure 15 shows an example of the configuration of vehicle 2001. As shown in Figure 15, 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 this disclosure may be applied to a communication device mounted on vehicle 2001, for example, to the communication module 2013.

[0137] The drive unit 2002 consists 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 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, which is operated by the user.

[0138] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0139] Signals from various sensors 2021 to 2029 include current signals from current sensor 2021 for sensing motor current, front or rear wheel rotation speed signals acquired by rotation speed sensor 2022, front or rear wheel air pressure signals acquired by air pressure sensor 2023, vehicle speed signals acquired by vehicle speed sensor 2024, acceleration signals acquired by acceleration sensor 2025, accelerator pedal depression signals acquired by accelerator pedal sensor 2029, brake pedal depression signals acquired by brake pedal sensor 2026, shift lever operation signals acquired by shift lever sensor 2027, and detection signals acquired by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0140] The Information Service Unit 2012 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Service Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001. The Information Service Unit 2012 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0141] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0142] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends 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, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021-29 provided in the vehicle 2001.

[0143] 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 external devices. For example, it can send and receive various types of information with external devices 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 or a mobile station.

[0144] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include the information based on the above input.

[0145] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle 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 also be called an output unit, which outputs information (for example, outputs information to devices such as displays and speakers 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 the 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 2021-2029, etc., provided in the vehicle 2001.

[0146] <Additional Notes> (Additional Note 1) A terminal comprising: a receiving unit that performs monitoring of a low-power wake-up signal from a base station; and a control unit that determines a method to be applied to the low-power wake-up signal based on at least one of instruction information indicating a method to be applied to the low-power wake-up signal from the base station or a terminal capability relating to a method to be applied to the low-power wake-up signal possessed by the terminal, wherein the control unit controls the monitoring based on the determined method, and the method is a bitmap method or a code point method.

[0147] (Appendix 2) The terminal as described in Appendix 1, comprising a transmitting unit that transmits information indicating the terminal capability to the base station, wherein the method applied to the low-power wake-up signal indicated by the instruction information is determined by the base station based on the terminal capability.

[0148] (Note 3) The terminal described in Note 1, wherein the terminal capability indicates at least one of the following: the method applied to the low-power wake-up signal that the terminal supports, the method applied to the low-power wake-up signal to be set on the terminal, or the type of receiver of the terminal.

[0149] (Note 4) The terminal is the terminal described in Note 1, which is in RRC (Radio Resource Control) CONNECTD mode.

[0150] (Note 5) The terminal is the terminal described in Note 1, which is in RRC IDLE / INACTIVE mode.

[0151] (Appendix 6) A communication method performed by a terminal, comprising: the step of monitoring a low-power wake-up signal from a base station; the step of determining a method to be applied to the low-power wake-up signal based on at least one of information indicating a method to be applied to the low-power wake-up signal from the base station or a terminal capability of the terminal regarding a method to be applied to the low-power wake-up signal; and the step of controlling the monitoring based on the determined method, wherein the method is a bitmap method or a code point method.

[0152] Any of the above configurations can optimize the reception accuracy, energy efficiency, and communication resources of LP-WUS using OOK modulation. By controlling the arrangement method of information bits and the number of repetitions using the above configurations, it is possible to achieve low-power and highly reliable LP-WUS communication.

[0153] (Supplement to Embodiments) Although these embodiments have been described above, the disclosed invention is not limited to these embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but 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, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. The processing procedures described in the embodiments may be rearranged as long as they do not contradict each other. For the convenience of explaining the processing, base stations and terminals have been described using functional block diagrams, but such devices may be realized in hardware, software, or a combination thereof. The software operated by the processor of the base station according to this embodiment and the software operated by the processor of the terminal according to this embodiment may be stored in any suitable storage medium, such as random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or other appropriate storage medium.

[0154] Furthermore, notification of information is not limited to the embodiments described herein and may be carried out by other means. For example, notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0155] Each aspect / embodiment described in this disclosure may be applied to at least one of systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), 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®, GSM®, CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other appropriate systems, as well as next-generation systems extended based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0156] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0157] In this specification, specific operations performed by a base station may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0158] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0159] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0160] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a Boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0161] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0162] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0163] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. 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 voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0164] In addition, terms used 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 the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0165] The terms “system” and “network” as used in this disclosure are interchangeable.

[0166] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0167] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0168] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "base station equipment", "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. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0169] A base station can accommodate one or more (e.g., three) cells. If a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0170] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform control or operation based on the information.

[0171] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0172] 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 several other appropriate terms.

[0173] 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 also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include devices that do 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.

[0174] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this 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 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminal may have the functions that the base station has as described above. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0175] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0176] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, or inquiring (e.g., searching in a table, database, or other data structure), or ascertaining. “Determining” may also include receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0177] The terms “connected,” “coupled,” or any variation thereof, mean 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” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0178] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0179] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0180] Any reference to elements using the designations “first,” “second,” etc., as 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 way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0181] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0182] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0183] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist 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.

[0184] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic may include, 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 configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0185] 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 also be a time unit based on neurologic.

[0186] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called a PDSCH (or PUSCH) mapping type B.

[0187] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0188] 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 a subframe and a TTI may be a subframe in existing LTE (1 ms), 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.

[0189] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each terminal) in TTI units. However, the definition of TTI is not limited to this.

[0190] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the actual time interval (e.g., number of symbols) in which the transport block, code block, code word, etc. are mapped may be shorter than the TTI.

[0191] Furthermore, if one slot or one mini-slot is referred to as a TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit for scheduling. In addition, the number of slots (number of mini-slots) that constitute this minimum time unit for scheduling may be controlled.

[0192] A TTI with a time length of 1 ms may be called a normal TTI, a long TTI, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, a slot, etc.

[0193] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0194] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0195] Furthermore, the time domain of the RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0196] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0197] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0198] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. The PRBs may be defined and numbered within a given BWP.

[0199] A BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set within a single carrier for a UE.

[0200] At least one of the configured BWPs may be active, and the UE does not need to assume that it will transmit or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0201] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless 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, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0202] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0203] 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 "combine" may be interpreted similarly to "different."

[0204] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0205] Although the present disclosure has been described in detail above, it will be 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 intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way.

[0206] This patent application claims priority based on Japanese Patent Application No. 2025-019535, filed on 7 February 2025, and the entire contents of Japanese Patent Application No. 2025-019535 are incorporated herein by reference.

[0207] 10 Base station 110 Transmitting unit 120 Receiving unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmitting unit 220 Receiving unit 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 Rotation 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 Driver assistance system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (I / O port)

Claims

1. A terminal comprising: a receiving unit that performs monitoring of a low-power wake-up signal from a base station; and a control unit that determines a method to be applied to the low-power wake-up signal based on at least one of instruction information indicating a method to be applied to the low-power wake-up signal from the base station or a terminal capability relating to a method to be applied to the low-power wake-up signal possessed by the terminal, wherein the control unit controls the monitoring based on the determined method, and the method is a bitmap method or a code point method.

2. The terminal according to claim 1, comprising a transmitting unit that transmits information indicating the terminal capability to the base station, wherein the method applied to the low-power wake-up signal indicated by the instruction information is determined by the base station based on the terminal capability.

3. The terminal according to claim 1, wherein the terminal capability indicates at least one of the following: a method applied to the low-power wake-up signal supported by the terminal, a method applied to the low-power wake-up signal to be set on the terminal, or the type of receiver of the terminal.

4. The terminal according to claim 1, wherein the terminal is in RRC (Radio Resource Control) CONNECTD mode.

5. The terminal according to claim 1, wherein the terminal is in RRC IDLE / INACTIVE mode.

6. A communication method performed by a terminal, comprising: the step of monitoring a low-power wake-up signal from a base station; the step of determining a method to be applied to the low-power wake-up signal based on at least one of information indicating a method to be applied to the low-power wake-up signal from the base station or a terminal capability of the terminal regarding a method to be applied to the low-power wake-up signal; and the step of controlling the monitoring based on the determined method, wherein the method is a bitmap method or a code point method.

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