Terminal and communication method

Abstract

This terminal comprises: a reception unit that monitors a low power wake-up signal from a base station; and a control unit that, on the basis of an orthogonal frequency division multiplexing (OFDM) sequence overlaid on a symbol corresponding to an information bit of the low power wake-up signal, acquires the information bit corresponding to the symbol. The OFDM sequence, which is associated in order from a previous information bit or in order from a subsequent information bit in an information bit string including the information bit, is overlaid on the symbol.

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), in the design of LP-WUS (Low Power Wake-Up Signal), a method of applying (overlaying) an OFDM (Orthogonal Frequency Division Multiplexing) sequence to each ON chip in an OFDM symbol has been discussed. In this method, one OFDM sequence selected from a plurality of candidates is overlaid for each ON chip in the OFDM symbol, and a terminal (for example, an OFDM-based LP-WUR (Low Power Wake-Up Receiver)) acquires LP-WUS information via the overlaid OFDM sequence (overlaid OFDM sequence). Furthermore, in this method, it has been studied whether the overlaid OFDM sequence transmits all LP-WUS information bits.

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

[0004] In order to improve the reception efficiency of LP-WUS, a mechanism of early termination that ends reception when necessary information can be obtained with sufficient reliability before the terminal receives all LP-WUS signals is effective. However, for the method in which the overlaid OFDM sequence transmits all LP-WUS information bits, it has not been clearly determined how to introduce the early termination mechanism, so it is difficult to optimize the reception process.

[0005] Furthermore, the OFDM sequence overlaid on each ON chip may differ depending on the LP-WUS information bits. However, since it has not been clearly defined how the LP-WUS information bits and the information bits transmitted by the overlaid OFDM sequence should be mapped, there is a risk that LP-WUS transmission using the overlaid OFDM sequence may not be performed efficiently.

[0006] Furthermore, in LP-WUS, repeated transmission is crucial for improving reliability. However, it is unclear how to apply the repetition of overlaid OFDM sequences within the ON chip of an OFDM symbol.

[0007] The terminal in this embodiment includes a receiving unit that monitors a low-power wake-up signal from a base station, and a control unit that acquires the information bits corresponding to a symbol based on an OFDM sequence overlaid on a symbol corresponding to the information bits of the low-power wake-up signal, wherein the OFDM sequence, which is associated with the information bits in an information bit sequence including the information bits in order from the previous information bit or in order from the next information bit, is overlaid on the symbol.

[0008] According to this embodiment, efficient transmission and reception of LP-WUS using OFDM sequences is enabled in a wireless communication system.

[0009] This figure illustrates the wireless communication system in this embodiment. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 1 bit in the OOK symbol in Example 1-1. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 2 bits in the OOK symbol in Example 1-1. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 4 bits in the OOK symbol in Example 1-1. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 1 bit in the OOK symbol in Example 1-2-1. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 2 bits in the OOK symbol in Example 1-2-1. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 4 bits in the OOK symbol in Example 1-2-1. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 1 bit in the OOK symbol in Example 1-2-2. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 2 bits in the OOK symbol in Example 1-2-2. This figure shows an example of the placement of an overlaid OFDM sequence transmitting 4 bits on an OOK symbol in Example 1-2-2. This figure shows an example of how to assign information bits to bit groups in Example 1-3. This figure shows an example of how to assign information bits to bit groups in Example 1-3. This figure shows an example of how to assign information bits to bit groups in Example 1-3. This figure shows an example of how to assign information bits to bit groups in Example 1-3. This figure shows an example of how to assign information bits to bit groups in Example 1-3. This figure shows an example of the repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits 2 bits in Example 2-1. This figure shows an example of the repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits 4 bits in Example 2-1. This figure shows an example of the repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits 1 bit in Example 2-2.This figure shows an example of the repetition of the overlaid OFDM sequence when the overlaid OFDM sequence transmits 2 bits in Example 2-2. This figure shows an example of the repetition of the overlaid OFDM sequence when the overlaid OFDM sequence transmits 4 bits in Example 2-2. This figure shows an example of the functional configuration of the base station in this embodiment. This figure shows an example of the functional configuration of the terminal in this embodiment. This figure shows an example of the hardware configuration of the base station or terminal in this embodiment. This figure shows an example of the vehicle configuration in this embodiment.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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).

[0014] 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.

[0015] 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.

[0016] 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).

[0017] 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.

[0018] 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.

[0019] In the following explanation, " / " means "and / or" unless otherwise specified, or unless the context makes it clear that it has a different meaning.

[0020] Within 3GPP, a method is being discussed for LP-WUS design in which an OFDM (Orthogonal Frequency Division Multiplexing) sequence is overlaid on each ON chip within an OFDM symbol. In this method, one OFDM sequence selected from several candidates is overlaid on each ON chip within the OFDM symbol, and a terminal (e.g., an OFDM-based LP-WUR) acquires LP-WUS information via this overlaid OFDM sequence (overlaid OFDM sequence). Furthermore, in this method, it is being considered that the overlaid OFDM sequence transmits all LP-WUS information bits.

[0021] To improve the reception efficiency of LP-WUS, an early termination mechanism is effective, where reception ends when the terminal has obtained the necessary information with sufficient confidence, before receiving all LP-WUS signals. However, it is difficult to optimize reception processing because it is not clear how to implement an early termination mechanism for systems where an overlaid OFDM sequence transmits all LP-WUS information bits.

[0022] Furthermore, the OFDM sequence overlaid on each ON chip may differ depending on the LP-WUS information bits. However, since it has not been clearly defined how the LP-WUS information bits and the information bits transmitted by the overlaid OFDM sequence should be mapped, there is a risk that LP-WUS transmission using the overlaid OFDM sequence may not be performed efficiently.

[0023] Furthermore, in LP-WUS, repeated transmission is crucial for improving reliability. However, it is unclear how to apply the repetition of overlaid OFDM sequences within the ON chip of an OFDM symbol.

[0024] According to this embodiment, an optimal configuration of the OFDM sequence applied to the ON chip within the OFDM symbol corresponding to the LP-WUS information is achieved.

[0025] In this embodiment, the OFDM sequence is applied to (overlaid) the ON chip within the OFDM symbol. The ON chip within the OFDM symbol may be referred to as, for example, the OOK "ON" symbol or the ON symbol, or simply the symbol. The OFDM sequence overlaid on the OOK "ON" symbol is referred to as the overlaid OFDM sequence.

[0026] In this embodiment, Manchester coding may be applied to the OOK symbol. For example, when Manchester coding with a coding rate of 1 / 2 is applied, information bit 0 may be modulated to 0,1 of the OOK symbol, or information bit 1 may be modulated to 1,0 of the OOK symbol.

[0027] A common OFDM sequence X may be applied to any information bit as an overlaid OFDM sequence to the 1 of the OOK symbol. For example, when information bit 0 is modulated to 0,1 of the OOK symbol, OFDM sequence X may be applied to this 1, or when information bit 1 is modulated to 1,0 of the OOK symbol, OFDM sequence X may be applied to this 1.

[0028] A different OFDM sequence X or Y may be applied to each information bit as an overlaid OFDM sequence to the 1 of the OOK symbol. For example, when information bit 0 is modulated to 0,1 of the OOK symbol, OFDM sequence X may be applied to this 1, and when information bit 1 is modulated to 1,0 of the OOK symbol, OFDM sequence Y may be applied to this 1. Here, OFDM sequences X and Y may generate different sequences, or they may use different parts of a common sequence A. For example, the first half of sequence A may be X and the second half may be Y.

[0029] The operation of the wireless communication system in this embodiment will now be described. The base station 10 transmits LP-WUS to the terminal 20 using an OFDM sequence overlaid on an OOK symbol (overlaid OFDM sequence).

[0030] The contents of LP-WUS are represented, for example, by LP-WUS information in bitmap format. LP-WUS information may also be referred to as information bits or LP-WUS information bits. One or more LP-WUS information bits may be referred to as an LP-WUS information bit sequence. LP-WUS information bits are represented by ON / OFF chips within the OFDM. LP-WUS information bits are mapped to OFDM sequences that are applied to the ON chips within the OFDM (overlaid on the OOK "ON" symbol).

[0031] Terminal 20 acquires LP-WUS information bits based on the received overlaid OFDM sequence.

[0032] (Example 1) Example 1 defines a method for transmitting an overlaid OFDM sequence indicating information bits, that is, how the overlaid OFDM sequence should be positioned (overlaid) on the OOK symbol. According to Example 1, an OFDM sequence associated with the information bit sequence containing the LP-WUS information bits, either sequentially from the previous information bit or sequentially from the next information bit, is overlaid on the OOK symbol.

[0033] (Example 1-1) In Example 1-1, the information bits shown by the overlaid OFDM sequence are placed in the OOK symbol in order from the beginning of the LP-WUS information bits (bit sequence).

[0034] In other words, in the time domain, the first OOK "ON" symbol is placed with an overlaid OFDM sequence indicating the first information bit of the LP-WUS information bit sequence. The next OOK "ON" symbol is placed with an overlaid OFDM sequence indicating the information bit following the first information bit of the LP-WUS information bit sequence.

[0035] An example of the placement of the overlaid OFDM sequence into the OOK symbol when the LP-WUS information bit sequence in Example 1-1 is '10010111' will be explained using Figure 2A-2C.

[0036] In Figure 2A-2C, "N1" represents the minimum number of OFDM symbols that terminal 20 must receive. That is, terminal 20 can obtain all the information bits by receiving the first N1 (>=1) OFDM symbols of LP-WUS. For example, even if LP-WUS uses a total of 8 OFDM symbols, terminal 20 may be able to recover all the information bits by receiving only the first N1 (e.g., 4) symbols. In this embodiment, "N1" in drawings other than Figure 2A-2C has the same meaning.

[0037] Figure 2A shows an example where an OFDM sequence transmits (carries or carries) one bit. As shown in Figure 2A, overlaid OFDM sequence #1, which represents '1', corresponding to the first bit (i.e., MSB (Most Significant Bit)) '1' of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2, which represents '0', corresponding to the second bit (0) '0' following the first bit of the LP-WUS information bit sequence '10010111', is placed in the second OOK "ON" symbol. Similarly, overlaid OFDM sequence #8, which represents '1', corresponding to the last bit (8th bit) '1' of the LP-WUS information bit sequence '10010111', is placed in the last OOK "ON" symbol.

[0038] Thus, in the example shown in Figure 2A, the information bits indicated by the overlaid OFDM sequence transmitting 1 bit are placed in the OOK "ON" symbol in order from the beginning of the LP-WUS information bit sequence, one bit at a time, as transmitted by the overlaid OFDM sequence.

[0039] Figure 2B shows an example where an OFDM sequence transmits two bits. As shown in Figure 2B, overlaid OFDM sequence #1, which represents '10', corresponding to the first two bits (bits 1-2) '10' of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2, which represents '01', corresponding to the next two bits (bits 3-4) '01' of the LP-WUS information bit sequence '10010111', is placed in the second OOK "ON" symbol. This is repeated in a similar manner, and overlaid OFDM sequence #4, which represents '11', corresponding to the last two bits (bits 7-8) '11' of the LP-WUS information bit sequence '10010111', is placed in the fourth OOK "ON" symbol.

[0040] Thus, in the example of FIG. 2B, the information bits indicated by the overlaid OFDM sequence that transmits 2 bits are arranged in the OOK "ON" symbols in order from the front of the LP-WUS information bit sequence in units of 2 bits transmitted by the overlaid OFDM sequence.

[0041] FIG. 2C shows an example when the OFDM sequence transmits 4 bits. As shown in FIG. 2C, the overlaid OFDM sequence #1 indicating '1001', corresponding to the first (from the front) 4 bits ('1001') of the LP-WUS information bit sequence '10010111', is arranged in the first OOK "ON" symbol. The overlaid OFDM sequence #2 indicating '0111', corresponding to the next 4 bits (bits 5-8) '0111' of the LP-WUS information bit sequence '10010111', is arranged in the second OOK "ON" symbol.

[0042] Thus, in the example of FIG. 2C, the information bits indicated by the overlaid OFDM sequence that transmits 4 bits are arranged in the OOK "ON" symbols in order from the front of the LP-WUS information bit sequence in units of 4 bits transmitted by the overlaid OFDM sequence.

[0043] (Example 1-2) In Example 1-2, the information bits indicated by the overlaid OFDM sequence are arranged in the OOK symbols in order from the back of the LP-WUS information bits (bit sequence).

[0044] In other words, in the time domain, the overlaid OFDM sequence indicating the last information bit of the LP-WUS information bit sequence is arranged in the first OOK "ON" symbol. In the next OOK "ON" symbol, the overlaid OFDM sequence indicating the information bit next to the last information bit in the reverse order of the LP-WUS information bit sequence is arranged.

[0045] (Example 1-2-1) According to Example 1-2-1, the information bits indicated by the overlaid OFDM sequence are arranged in the OOK "ON" symbols in order from the end of the LP-WUS information bit sequence for each overlaid OFDM sequence. "For each overlaid OFDM sequence" may mean the unit of the information bits (number of information bits) transmitted by the overlaid OFDM sequence.

[0046] An example of the arrangement of the overlaid OFDM sequence in the OOK symbols when the LP-WUS information bit sequence in Example 1-2-1 is '10010111' will be described using FIGS. 3A-3C.

[0047] FIG. 3A shows an example when the OFDM sequence transmits 1 bit. As shown in FIG. 3A, the overlaid OFDM sequence #1 indicating '1', corresponding to the last bit (the 8th bit) '1' of the LP-WUS information bit sequence '10010111', is arranged in the first OOK "ON" symbol. The overlaid OFDM sequence #2 indicating '1', corresponding to the bit next to the last bit (the 7th bit) '1' in the reverse order of the LP-WUS information bit sequence '10010111', is arranged in the second OOK "ON" symbol. Repeating in the same way, the overlaid OFDM sequence #8 indicating '1', corresponding to the first bit (the 1st bit) '1' of the LP-WUS information bit sequence '10010111', is arranged in the last OOK "ON" symbol.

[0048] Thus, in the example of FIG. 3A, the information bits indicated by the overlaid OFDM sequence that transmits 1 bit are arranged in the OOK "ON" symbols in order from the end of the LP-WUS information bit sequence in units of 1 bit transmitted by the overlaid OFDM sequence.

[0049] Figure 3B shows an example where an OFDM sequence transmits 2 bits. As shown in Figure 3B, overlaid OFDM sequence #1, which represents '11', corresponding to the last two bits (bits 7-8) '11' of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2, which represents '01', corresponding to the next two bits (bits 5-6) '01' following the last two bits in the reverse order of the LP-WUS information bit sequence '10010111', is placed in the second OOK "ON" symbol. Similarly, overlaid OFDM sequence #4, which represents '10', corresponding to the first two bits (bits 1-2) '10' of the LP-WUS information bit sequence '10010111', is placed in the fourth OOK "ON" symbol.

[0050] Thus, in the example shown in Figure 3B, the information bits indicated by the overlaid OFDM sequence transmitting 2 bits are placed in the OOK "ON" symbol in order from the end of the LP-WUS information bit sequence, in units of 2 bits transmitted by the overlaid OFDM sequence.

[0051] Figure 3C shows an example where an OFDM sequence transmits 4 bits. As shown in Figure 3C, overlaid OFDM sequence #1, which represents '0111', corresponding to the last 4 bits (bits 5-8) '0111' of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2, which represents '1001', corresponding to the next 4 bits (bits 1-4) '1001' following the last 4 bits in the reverse order of the LP-WUS information bit sequence '10010111', is placed in the second OOK "ON" symbol.

[0052] Thus, in the example shown in Figure 3C, the information bits indicated by the overlaid OFDM sequence transmitting 4 bits are placed in the OOK "ON" symbol in order from the end of the LP-WUS information bit sequence, in units of 4 bits transmitted by the overlaid OFDM sequence.

[0053] (Example 1-2-2) According to Example 1-2-2, the information bits represented by the overlaid OFDM sequence are placed on the OOK "ON" symbol bit by bit, in order from the end of the LP-WUS information bit sequence. In Example 1-2-2, for example, the LP-WUS information bit sequence may be inverted, and the overlaid OFDM sequence may be mapped sequentially to the inverted information bit sequence. That is, the OFDM sequence associated with the inverted information bit sequence of the LP-WUS information bit sequence, in order from the previous information bit, is overlaid on the OOK symbol.

[0054] An example of the placement of the overlaid OFDM sequence into the OOK symbol when the LP-WUS information bit sequence in Example 1-2-2 is '10010111' will be explained using Figure 4A-4C.

[0055] Figure 4A shows an example where an OFDM sequence transmits one bit. As shown in Figure 4A, the LP-WUS information bit sequence '10010111' is inverted to '11101001'. Overlaid OFDM sequence #1, which indicates '1', corresponding to the first bit (1st bit) '1' of the inverted LP-WUS information bit sequence '11101001', is placed at the first OOK "ON" symbol. Overlaid OFDM sequence #2, which indicates '1', corresponding to the next bit (2nd bit) '1' of the inverted LP-WUS information bit sequence '11101001', is placed at the second OOK "ON" symbol. This is repeated in a similar manner, and overlaid OFDM sequence #8, which indicates '1', corresponding to the last bit (8th bit) '1' of the inverted LP-WUS information bit sequence '11101001', is placed at the last OOK "ON" symbol.

[0056] Thus, in the example shown in Figure 4A, the information bits indicated by the overlaid OFDM sequence transmitting 1 bit are placed bit by bit into the OOK "ON" symbol in order from the end of the LP-WUS information bit sequence.

[0057] Figure 4B shows an example where the OFDM sequence transmits 2 bits. As shown in Figure 4B, the LP-WUS information bit sequence '10010111' is inverted to '11101001'. Overlaid OFDM sequence #1, representing '11', which corresponds to the first two bits (bits 1-2) '11' of the inverted LP-WUS information bit sequence '11101001', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2, representing '10', which corresponds to the next two bits (bits 3-4) '10' of the inverted LP-WUS information bit sequence '11101001', is placed in the second OOK "ON" symbol. Similarly, the overlaid OFDM sequence #4 indicating '01', corresponding to the last two bits (bits 7-8) '01' of the repeated and inverted LP-WUS information bit sequence '11101001', is placed in the final OOK 'ON' symbol.

[0058] Thus, in the example shown in Figure 4B, the information bits indicated by the overlaid OFDM sequence transmitting 2 bits are placed bit by bit into the OOK "ON" symbol in order from the end of the LP-WUS information bit sequence.

[0059] Figure 4C shows an example where an OFDM sequence transmits 4 bits. As shown in Figure 4C, the LP-WUS information bit sequence '10010111' is inverted to '11101001'. Overlaid OFDM sequence #1, representing '1110', which corresponds to the first 4 bits (bits 1-4) '1110' of the inverted LP-WUS information bit sequence '11101001', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2, representing '1001', which corresponds to the next 4 bits (bits 5-8) '1001' of the inverted LP-WUS information bit sequence '11101001', is placed in the second OOK "ON" symbol.

[0060] Thus, in the example shown in Figure 4C, the information bits represented by the overlaid OFDM sequence transmitting 4 bits are placed bit by bit into the OOK "ON" symbol in order from the end of the LP-WUS information bit sequence.

[0061] According to the above embodiment 1-2, the error rate can be reduced by arranging the LP-WUS information bits in order from the end of the OOK "ON" symbol. By placing the last bit of the LP-WUS information bit sequence first in the OOK "ON" symbol, it becomes easier to preferentially acquire specific information bits, thereby improving the accuracy of LP-WUS identification.

[0062] (Examples 1-3) In Examples 1-3, the information bits shown by the overlaid OFDM sequence may be interleaved and placed in the OOK symbol.

[0063] For example, when an overlaid OFDM sequence transmits 2 bits, bit groups may be set by dividing the LP-WUS information bit sequence into 2-bit groups from the beginning. As shown in Figure 5A, the LP-WUS information bit sequence '10010111' may be divided into 2-bit groups from the beginning, with '10' (bits 1-2) set as bit group #1, '01' (bits 3-4) set as bit group #2, '01' (bits 5-6) set as bit group #3, and '11' (bits 6-7) set as bit group #4.

[0064] For example, when an overlaid OFDM sequence transmits 2 bits, bit groups may be set by dividing the LP-WUS information bit sequence into information bits indicated by the overlaid OFDM sequence. As shown in Figure 5B, the LP-WUS information bit sequence '10010111' may be divided into groups of 2 bits from the beginning, with '10' (bits 1-2) set to bit group #1, '01' (bits 3-4) set to bit group #2, '01' (bits 5-6) set to bit group #2, and '11' (bits 6-7) set to bit group #3. As shown in Figure 5B, for example, the information bit '00' may be set to bit group #4.

[0065] For example, when an overlaid OFDM sequence transmits 4 bits, bit groups may be set by dividing the LP-WUS information bit sequence into groups of 4 bits from the beginning. As shown in Figure 5C, the LP-WUS information bit sequence '10010111' may be divided into groups of 4 bits from the beginning, with '1001' (bits 1-4) set as bit group #1 and '0111' (bits 5-8) set as bit group #2.

[0066] For example, when an overlaid OFDM sequence transmits 4 bits, bit groups may be set by dividing the LP-WUS information bit sequence into information bits indicated by the overlaid OFDM sequence. As shown in Figure 5D, the LP-WUS information bit sequence '10010111' may be divided into groups of 4 bits from the beginning, with '1001' (bits 1-4) set to bit group #1 and '0111' (bits 5-8) set to bit group #2. As shown in Figure 5D, for example, information bit '1001' may be set to bit group #3, ... information bit '11111' may be set to bit group #16.

[0067] The number of bits per bit group may depend on the number of bits that the OFDM sequence can transmit. For example, the number of bits per bit group may be the same as the number of bits that the OFDM sequence can transmit.

[0068] The index (number) of the bit group corresponding to the information bit can be any index.

[0069] (Example 1-3-1) According to Example 1-3-1, the relationship between bit groups and corresponding information bits may be determined based on predefined rules. For example, bit group #1 may be pre-associated with '10', bit group #3 with '01', bit group #4 with '11', and bit group #2 with '01'.

[0070] (Example 1-3-2) According to Example 1-3-2, the relationship between a bit group and the corresponding information bit may be set or instructed to the terminal 20 by a predetermined signal from the network (e.g., base station 10). The relationship between a bit group and the corresponding information bit may be indicated, for example, for each number of information bits that the overlaid OFDM sequence can transmit. 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).

[0071] For example, a setting or instruction indicating which of the above-described embodiments should be applied may be transmitted from the base station 10 to the terminal 20.

[0072] Settings or instructions indicating the relationship between bit groups and corresponding information bits may be defined as a predetermined table.

[0073] (Example 1-3-3) The relationship between a bit group and the corresponding information bit may be determined based on a predetermined mathematical formula. For example, the predetermined mathematical formula may be determined in the order bit group #subgroupID mod X. The parameter "X" may be set or instructed to the terminal 20, for example, via SIB, RRC, MAC CE, or DCI. The parameter "X" may be specified, for example, as a specific value.

[0074] According to Example 1, the transmission efficiency of LP-WUS information bits can be improved by optimizing the arrangement method of the OFDM sequence overlaid on the OOK symbol. By arranging the overlaid OFDM sequence based on the order of the OOK "ON" symbols, the terminal can sequentially restore the information bits, and the introduction of an early termination mechanism becomes easier. As a result, it is possible to reduce the power consumption of the terminal and improve the efficiency of the reception processing.

[0075] According to Examples 1-3, interleaving LP-WUS information bits and placing them in the OOK "ON" symbol improves error tolerance due to fading and interference. Because the information bits are distributed as different bit groups, even if a specific OOK "ON" symbol is missing, the entire information can be restored, thus realizing highly reliable LP-WUS communication.

[0076] (Example 2) Example 2 shows a method for repeatedly setting an overlaid OFDM sequence in an OOK symbol. The repetition of the overlaid OFDM sequence may mean the repetition of information bits or the repetition of information bits indicated by the overlaid OFDM sequence.

[0077] This allows for improved LP-WUS reception reliability by repeatedly applying the overlaid OFDM sequence placed on the OOK symbol. By placing the same overlaid OFDM sequence indicating the same information bits on multiple OOK "ON" symbols, the receiving terminal can more reliably detect the information bits, improving error correction capabilities.

[0078] (Example 2-1) According to Example 2-1, in the OOK symbol, the overlaid OFDM sequence may be repeated at all information bit levels.

[0079] Figure 6A shows an example of the repetition of the overlaid OFDM sequence when the LP-WUS information bit sequence in Example 2-1 is '10010111' and the overlaid OFDM sequence transmits 2 bits.

[0080] As shown in Figure 6A, the overlaid OFDM sequence #1, which represents '10' and corresponds to the first two bits (bits 1-2) '10' of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. The overlaid OFDM sequence #2, which represents '01' and corresponds to the next two bits (bits 3-4) '01' of the LP-WUS information bit sequence '10010111', is placed in the second OOK "ON" symbol. The overlaid OFDM sequence #3, which represents '01' and corresponds to the next two bits (bits 5-6) '01' of the LP-WUS information bit sequence '10010111', is placed in the third OOK "ON" symbol. The overlaid OFDM sequence #4, which represents '11', corresponding to the last two bits (bits 7-8) of the LP-WUS information bit sequence '10010111', is placed in the fourth OOK "ON" symbol.

[0081] In the example in Figure 6A, the remaining OOK "ON" symbols (i.e., from the 5th onwards) are sequentially repeated with the overlaid OFDM sequences that were placed on the 1st and subsequent OOK "ON" symbols. For example, each of the 5th through 8th OOK "ON" symbols is repeatedly placed with each of the overlaid OFDM sequences that were placed on the 1st through 4th OOK "ON" symbols.

[0082] Figure 6B shows an example of the repetition of the overlaid OFDM sequence when the LP-WUS information bit sequence in Example 2-1 is '10010111' and the overlaid OFDM sequence transmits 4 bits.

[0083] As shown in Figure 6B, the overlaid OFDM sequence #1 indicating '1001', corresponding to the first four bits (bits 1-4) '1001' of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. The overlaid OFDM sequence #2 indicating '0111', corresponding to the next four bits (bits 5-8) '0111' following the first four bits of the LP-WUS information bit sequence '10010111', is placed in the second OOK "ON" symbol.

[0084] In the example in Figure 6B, the overlaid OFDM sequence placed in the first and second OOK "ON" symbols is repeated sequentially in the remaining (i.e., third and subsequent) OOK "ON" symbols. For example, the overlaid OFDM sequence placed in the first OOK "ON" symbol is repeated in the third, fifth, and seventh OOK "ON" symbols, and the overlaid OFDM sequence placed in the second OOK "ON" symbol is repeated in the fourth, sixth, and eighth OOK "ON" symbols.

[0085] According to Example 2-1, in the OOK "ON" symbol, the overlaid OFDM sequence is repeated at all information bit levels, increasing the likelihood of recovering information from other symbols even if a specific OOK "ON" symbol is not received. This improves the LP-WUS reception success rate even in poor communication environments.

[0086] (Example 2-2) According to Example 2-2, in the OOK symbol, the overlaid OFDM sequence may be repeated on a bit group basis.

[0087] Figure 7A shows an example of the repetition of an overlaid OFDM sequence when the LP-WUS information bit sequence in Example 2-2 is '10010111' and the overlaid OFDM sequence transmits 1 bit. In the example in Figure 7A, the first bit '1', the second bit '0', the third bit '0', and the fourth bit '1' of the LP-WUS information bit sequence '10010111' are associated with bit groups #1, #2, #3, and #4, respectively.

[0088] As shown in Figure 7A, the overlaid OFDM sequence indicating '1', corresponding to the first bit (MSB) '1' of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. The overlaid OFDM sequence indicating '1', associated with bit group #1, is repeatedly placed in the second OOK "ON" symbol.

[0089] The overlaid OFDM sequence indicating '0', corresponding to the second bit '0' of the LP-WUS information bit sequence '10010111', is placed in the third OOK "ON" symbol. The overlaid OFDM sequence indicating '0', associated with bit group #2, is repeatedly placed in the fourth OOK "ON" symbol.

[0090] The overlaid OFDM sequence indicating '0', corresponding to the third bit '0' of the LP-WUS information bit sequence '10010111', is placed in the fifth OOK "ON" symbol. The overlaid OFDM sequence indicating '0', associated with bit group #3, is repeatedly placed in the sixth OOK "ON" symbol.

[0091] The overlaid OFDM sequence indicating '1', corresponding to the fourth bit '1' of the LP-WUS information bit sequence '10010111', is placed in the seventh OOK "ON" symbol. The overlaid OFDM sequence indicating '1', associated with bit group #4, is repeatedly placed in the eighth OOK "ON" symbol.

[0092] Figure 7B shows an example of the repetition of an overlaid OFDM sequence when the LP-WUS information bit sequence in Example 2-2 is '10010111' and the overlaid OFDM sequence transmits 2 bits. In the example in Figure 7B, the information bits '10', '01', and '11' are associated with bit groups #1, #2, and #3, respectively.

[0093] As shown in Figure 7B, the overlaid OFDM sequence indicating '10', corresponding to the first two bits (bits 1-2) of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. The overlaid OFDM sequence indicating '10', associated with bit group #1, is repeatedly placed in the second OOK "ON" symbol.

[0094] The overlaid OFDM sequence indicating '01', corresponding to the two bits following the first two bits (bits 3-4) of the LP-WUS information bit sequence '10010111', is placed in the third OOK "ON" symbol. The overlaid OFDM sequence indicating '01', associated with bit group #2, is repeatedly placed in the fourth OOK "ON" symbol.

[0095] The overlaid OFDM sequence indicating '01', corresponding to the next two bits (bits 5-6) '01' of the LP-WUS information bit sequence '10010111', is placed in the 5th OOK "ON" symbol. The overlaid OFDM sequence indicating '01', associated with bit group #2, is repeatedly placed in the 6th OOK "ON" symbol.

[0096] The overlaid OFDM sequence indicating '11', corresponding to the last two bits (bits 7-8) of the LP-WUS information bit sequence '10010111', is placed in the 7th OOK "ON" symbol. The overlaid OFDM sequence indicating '11', associated with bit group #3, is repeatedly placed in the 8th OOK "ON" symbol.

[0097] Figure 7C shows an example of the repetition of an overlaid OFDM sequence when the LP-WUS information bit sequence in Example 2-2 is '10010111' and the overlaid OFDM sequence transmits 4 bits. In the example in Figure 7C, the information bits '1001' and '0111' are associated with bit groups #1 and #2, respectively.

[0098] As shown in Figure 7C, the overlaid OFDM sequence indicating '1001', corresponding to the first four bits (bits 1-4) of the LP-WUS information bit sequence '10010111', is placed in the first OOK "ON" symbol. The overlaid OFDM sequence indicating '1001', associated with bit group #1, is repeatedly placed in the second OOK "ON" symbol.

[0099] The overlaid OFDM sequence indicating '0111', corresponding to the 4 bits (bits 5-8) following the first 4 bits of the LP-WUS information bit sequence '10010111', is placed in the third OOK "ON" symbol. The overlaid OFDM sequence indicating '0111', associated with bit group #2, is repeatedly placed in the fourth OOK "ON" symbol.

[0100] In the 5th and 6th OOK "ON" symbols, an overlaid OFDM sequence indicating '1001' associated with bit group #1 is repeatedly placed. In the 7th and 8th OOK "ON" symbols, an overlaid OFDM sequence indicating '0111' associated with bit group #2 is repeatedly placed.

[0101] According to Example 2-2, in the OOK "ON" symbol, the overlaid OFDM sequence is repeated on a bit group basis, enabling efficient utilization of communication resources. By repeatedly applying a different OFDM sequence to each group of information bits, it is possible to maintain information transmission efficiency while providing redundancy.

[0102] The above-described Examples 1 and 2 may be used in combination.

[0103] (Example 3) Example 2 described a method for repeatedly setting an overlaid OFDM sequence in an OOK symbol. Example 3 shows a method for determining the number of repetitions of an overlaid OFDM sequence in an OOK symbol. By appropriately controlling the number of repetitions of the overlaid OFDM sequence placed in the OOK symbol, it is possible to reduce the transmission of redundant signals while maintaining communication quality. Since it is possible to set the number of repetitions adaptively according to the communication environment and terminal characteristics, it contributes to optimizing power consumption and suppressing false detections.

[0104] (Example 3-1) According to Example 3-1, the number of repetitions of the overlaid OFDM sequence may be determined based on a predefined rule (condition).

[0105] For example, the number of repetitions may be determined based on whether the communication quality measured by terminal 20 is greater than or less than a predetermined threshold. The communication quality may be at least one of the following: RSRP (Reference Signal Received Power), SINR (Signal-to-Interference-plus-Noise Ratio), RSSI (Received Signal Strength Indicator), or RSRQ (Reference Signal Received Quality).

[0106] For example, the number of iterations of an overlaid OFDM sequence may be determined based on whether the false alarm rate (FAR) is greater than or less than a predetermined threshold. FAR is calculated as False Alarms / Total Non-Event Trials.

[0107] The predetermined thresholds for communication quality or FAR may be instructed or set by the base station 10, or they may be determined by the terminal capability (UE capability) of the terminal 20.

[0108] (Example 3-2) According to Example 3-2, the number of repetitions may be set or instructed to the terminal 20 by a signal from the network (e.g., base station 10). The signal for setting or instructing the number of repetitions may be, for example, SIB, RRC, MAC CE, or DCI.

[0109] In Example 3-2, terminal 20 may assume a default value for the number of repetitions. That is, a default value for the number of repetitions may be set for terminal 20. The default value for the number of repetitions 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.

[0110] (Example 3-3) According to Example 3-3, the number of repetitions may be determined based on the terminal capability (UE capability) of terminal 20.

[0111] For example, terminal 20 may assume a preferred or preferred number of repetitions in terminal capability. A preferred or preferred number of repetitions for terminal 20 may be set as a parameter of terminal capability. Base station 10 may determine an appropriate number of repetitions based on the terminal capability indicating the number of repetitions reported by terminal 20. Base station 10 may set or instruct terminal 20 to the number of repetitions determined based on terminal capability via SIB, RRC, MAC CE, or DCI.

[0112] For example, terminal 20 may assume the number of repetitions based on the type of LP-WUS receiver. The type of LP-WUS receiver may be the type of receiving method (e.g., OOK-based LR (Low-power Reception), OFDM-based LR). OOK-based LR is the lowest power receiving method and utilizes the OOK method, which uses simple ON / OFF signaling. OFDM-based LR is a receiving method that utilizes 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 an appropriate number of repetitions 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 the number of repetitions determined based on the terminal capability via SIB, RRC, MAC CE, or DCI.

[0113] In Example 3-3, terminal 20 may assume a default value for the number of repetitions based on terminal capabilities. That is, a default value for the number of repetitions based on terminal capabilities may be set for terminal 20. The default value for the number of repetitions 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.

[0114] Examples 3-2 and 3-3 described above may be used in combination.

[0115] (Example 3-4) According to Example 3-4, the number of repetitions may be determined based on a predetermined timer.

[0116] (Example 3-4-1) According to Example 3-4-1, a switching timer with a number of repetitions may be defined. The switching timer with a number of repetitions may be determined based on a DRX (Discontinuous Reception) cycle.

[0117] For example, the validity period "Y" of the 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).

[0118] (Example 3-4-2) In Example 3-4-2, the trigger condition for the switching timer is defined by the number of repetitions.

[0119] 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.

[0120] The trigger for disabling the timer function may be, for example, a signal transmitted from the network (base station 10) to the terminal 20.

[0121] (Example 3-5) Example 3-5 defines a formula for determining the number of repetitions. For example, the number of repetitions Nrep may be determined by the formula Nrep = Noc(Ninf / Noo). In the formula, Ninf represents the number of information bits. Noo represents the number of bits that can be represented (transmitted) by the overlaid OFDM. Noc represents the number of ON chips of OOK.

[0122] Examples 3-5 and 3-2 may be used in combination.

[0123] (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.

[0124] <Base Station> Figure 8 is a diagram showing an example of the functional configuration of the base station 10 in this embodiment. As shown in Figure 8, 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 8 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] <Terminal> Figure 9 is a diagram showing an example of the functional configuration of terminal 20 in this embodiment. As shown in Figure 9, 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 9 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.

[0129] 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.

[0130] 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.

[0131] (Hardware Configuration) The block diagrams (Figures 8 and 9) 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.

[0132] 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.

[0133] 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 10 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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 8 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 9 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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).

[0142] 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.

[0143] 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.

[0144] Figure 11 shows an example of the configuration of vehicle 2001. As shown in Figure 11, 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.

[0145] 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.

[0146] 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).

[0147] 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.

[0148] 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.).

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] <Additional Notes> (Additional Note 1) A terminal comprising: a receiving unit for monitoring a low-power wake-up signal from a base station; and a control unit for acquiring the information bits corresponding to a symbol based on an OFDM sequence overlaid on a symbol corresponding to the information bits of the low-power wake-up signal, wherein the OFDM sequence, which is associated with an information bit sequence containing the information bits in order from the previous information bit or in order from the next information bit, is overlaid on the symbol.

[0155] (Note 2) The terminal as described in Note 1, wherein the number of preceding or succeeding information bits associated with the OFDM sequence is the number of information bits carried by the OFDM sequence.

[0156] (Note 3) The terminal according to Note 1, wherein the OFDM sequence, which is associated in order from the previous information bit in the information bit sequence obtained by inverting the information bit sequence, is overlaid on the symbol.

[0157] (Note 4) The terminal described in Note 1, wherein each of the OFDM sequences associated with the information bits is repeatedly overlaid.

[0158] (Note 5) The terminal as described in Note 1, wherein the number of repetitions of each OFDM sequence is determined based on the number of information bits carried by the OFDM sequence.

[0159] (Appendix 6) A communication method performed by a terminal, comprising the steps of: monitoring a low-power wake-up signal from a base station; and acquiring the information bits corresponding to the OOK symbol based on an OFDM sequence overlaid on a symbol corresponding to the information bits of the low-power wake-up signal, wherein the OFDM sequence, which is associated with an information bit sequence containing the information bits in order from the previous information bit or in order from the next information bit, is overlaid on the symbol.

[0160] Any of the above configurations can optimize the reception accuracy, energy efficiency, and communication resources of LP-WUS using OFDM sequences. 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.

[0161] (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.

[0162] 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.

[0163] 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).

[0164] 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.

[0165] 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).

[0166] 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.

[0167] 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.

[0168] 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).

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] The terms “system” and “network” as used in this disclosure are interchangeable.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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."

[0185] 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.

[0186] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0187] 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."

[0188] 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.

[0189] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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".

[0209] 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.

[0210] 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.

[0211] 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."

[0212] 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).

[0213] 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.

[0214] This patent application claims priority based on Japanese Patent Application No. 2025-018807, filed on February 6, 2025, and the entire contents of Japanese Patent Application No. 2025-018807 are incorporated herein by reference.

[0215] 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 for monitoring a low-power wake-up signal from a base station; and a control unit for acquiring the information bits corresponding to a symbol based on an OFDM (Orthogonal Frequency Division Multiplexing) sequence overlaid on a symbol corresponding to the information bits of the low-power wake-up signal, wherein the OFDM sequence, which is associated with an information bit sequence containing the information bits in order from the previous information bit or in order from the next information bit, is overlaid on the symbol.

2. The terminal according to claim 1, wherein the number of preceding information bits or following information bits associated with the OFDM sequence is the number of information bits carried by the OFDM sequence.

3. The terminal according to claim 1, wherein the OFDM sequence, which is associated sequentially with the previous information bit in the information bit sequence obtained by inverting the information bit sequence, is overlaid on the symbol.

4. The terminal according to claim 1, wherein each of the OFDM sequences associated with the information bits is repeatedly overlaid.

5. The terminal according to claim 1, wherein the number of repetitions of each OFDM sequence is determined based on the number of information bits carried by the OFDM sequence.

6. A communication method performed by a terminal, comprising the steps of: monitoring a low-power wake-up signal from a base station; and acquiring the information bits corresponding to a symbol based on an OFDM (Orthogonal Frequency Division Multiplexing) sequence overlaid on a symbol corresponding to the information bits of the low-power wake-up signal, wherein the OFDM sequence, which is associated with an information bit sequence containing the information bits in order from the previous information bit or in order from the next information bit, is overlaid on the symbol.

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