Terminal and communication method

Abstract

To provide a terminal and a communication method that enable efficient transmission and reception of a low-power wake-up signal using an OFDM sequence in a wireless communication system.SOLUTION: In a wireless communication system, a terminal 20 includes a receiving unit that monitors a low-power wake-up signal from a base station, and a control unit that acquires information bits corresponding to Orthogonal Frequency Division Multiplexing (OFDM) symbols on the basis of an OFDM sequence overlaid on a symbol corresponding to the information bits of the low-power wake-up signal, and overlays the OFDM sequence, which is associated with the information bits in order from the earliest information bit or the latest information bit in an information bit string including the information bits, on the OFDM symbol.SELECTED DRAWING: Figure 9

Description

[Technical Field]

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

[0002] In the design of Low Power Wake-Up Signal (LP-WUS) in 3GPP (registered trademark), a scheme in which an Orthogonal Frequency Division Multiplexing (OFDM) sequence is applied (overlaid) to each ON-chip within an OFDM symbol is being discussed. In this scheme, one OFDM sequence selected from multiple candidates is overlaid on each ON-chip within an OFDM symbol, and a terminal (e.g., an OFDM-based Low Power Wake-Up Receiver (LP-WUR)) acquires LP-WUS information via the overlaid OFDM sequence (overlaid OFDM sequence). Furthermore, in this scheme, it is being considered that the overlaid OFDM sequence transmits all LP-WUS information bits. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] 3GPP TS 38.300 V18.4.0 (2024-12) [Non-patent document 2] 3GPP TS 38.401 V18.4.0(2024-12) Summary of the Invention [Problem to be solved by the invention]

[0004] To improve the reception efficiency of LP-WUS, an early termination mechanism is effective. This mechanism terminates reception when the necessary information is acquired reliably before the terminal receives all LP-WUS signals. However, it is not clear how to implement the early termination mechanism for a system in which all LP-WUS information bits are transmitted by overlaid OFDM sequences, making it 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, in the past, it was unclear how to map the LP-WUS information bits to the information bits carried by the overlaid OFDM sequence, which may make it difficult to efficiently perform LP-WUS transmission using the overlaid OFDM sequence.

[0006] In addition, in LP-WUS, repeated transmission is important to improve reliability. However, it is not clear how to apply the repetition of the overlaid OFDM sequence on-chip within an OFDM symbol. [Means for solving the problem]

[0007] The terminal in this embodiment comprises 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 the symbols based on an OFDM sequence overlaid on the symbols corresponding to the information bits of the low-power wake-up signal, and the OFDM sequence that corresponds to the information bits in an information bit string including the information bits in order from the earliest information bits or the latest information bits is overlaid on the symbols. [Effects of the Invention]

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

[0009] [Figure 1] FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2A] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting one bit to an OOK symbol in Example 1-1. [Figure 2B] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting two bits to an OOK symbol in Example 1-1. [Figure 2C] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting 4 bits to an OOK symbol in Example 1-1. [Figure 3A] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting one bit to an OOK symbol in Example 1-2-1. [Figure 3B] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting two bits to an OOK symbol in Example 1-2-1. [Figure 3C] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting 4 bits to an OOK symbol in Example 1-2-1. [Figure 4A] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting one bit to an OOK symbol in Example 1-2-2. [Figure 4B] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting two bits to an OOK symbol in Example 1-2-2. [Figure 4C] FIG. 10 is a diagram illustrating an example of allocation of an overlaid OFDM sequence transmitting 4 bits to an OOK symbol in Example 1-2-2. [Figure 5A] FIG. 10 is a diagram illustrating an example of a method for allocating information bits to bit groups in Examples 1-3. [Figure 5B]FIG. 10 is a diagram illustrating an example of a method for allocating information bits to bit groups in Examples 1-3. [Figure 5C] FIG. 10 is a diagram illustrating an example of a method for allocating information bits to bit groups in Examples 1-3. [Figure 5D] FIG. 10 is a diagram illustrating an example of a method for allocating information bits to bit groups in Examples 1-3. [Figure 6A] FIG. 10 is a diagram illustrating an example of repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits two bits in Example 2-1. [Figure 6B] FIG. 10 is a diagram illustrating an example of repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits 4 bits in Example 2-1. [Figure 7A] FIG. 10 is a diagram illustrating an example of repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits one bit in Example 2-2. [Figure 7B] FIG. 10 is a diagram illustrating an example of repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits two bits in Example 2-2. [Figure 7C] FIG. 10 is a diagram illustrating an example of repetition of an overlaid OFDM sequence when the overlaid OFDM sequence transmits 4 bits in Example 2-2. [Figure 8] FIG. 2 is a diagram illustrating an example of a functional configuration of a base station according to the present embodiment. [Figure 9] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal according to the present embodiment. [Figure 10] FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station or a terminal according to the present embodiment. [Figure 11] 1 is a diagram illustrating an example of a configuration of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present embodiment will be described below with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0011] The wireless communication system of this embodiment operates using existing technology. The existing technology is, for example, a wireless communication technology based on a communication standard such as the 3GPP standard. The existing technology is, for example, NR (New Radio), but is not limited to existing NR. Unless otherwise specified, the term "NR" used in this specification has a broad meaning including NR (5G) and subsequent systems (for example, 6G).

[0012] In the present embodiment described below, terms used in existing communication standards, 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), are used. 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 time division duplex (TDD) method, a frequency division duplex (FDD) method, or other methods (for example, flexible duplex, etc.).

[0014] In this embodiment, when radio parameters etc. are "configured," it may mean that a predetermined value is pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] Fig. 1 is a diagram showing an example of the configuration of a wireless communication system in this embodiment. As shown in Fig. 1, the wireless communication system in this embodiment includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, a PSS and an SSS. The system information is, for example, transmitted via a PBCH and is also referred to as broadcast information. The synchronization signal and system information may also be referred to as an SSB (SS / PBCH block). As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 in a downlink (DL) and receives control signals or data from the terminal 20 in an uplink (UL). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to the DL or UL. In addition, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

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

[0018] The terminal 20 in this embodiment may be, for example, a LP-WUR or an OFDM-based LP-WUR. The OFDM-based LP-WUR is a power-saving wake-up receiver that receives a LP-WUR using OFDM technology. The OFDM-based LP-WUR receives information using an OFDM sequence overlaid on an OOK "ON" symbol.

[0019] In the following description, unless otherwise specified or unless a different meaning is clear from the context, " / " means "and / or."

[0020] In the design of LP-WUS, 3GPP is discussing a method of overlaying an Orthogonal Frequency Division Multiplexing (OFDM) sequence onto each ON-chip within an OFDM symbol. In this method, one OFDM sequence selected from multiple candidates is overlaid onto each ON-chip within an OFDM symbol, and a terminal (e.g., an OFDM-based LP-WUR) obtains LP-WUS information via the overlaid OFDM sequence (overlaid OFDM sequence). Furthermore, in this method, it is being considered that the overlaid OFDM sequence will transmit all LP-WUS information bits.

[0021] To improve the reception efficiency of LP-WUS, an early termination mechanism is effective. This mechanism terminates reception when the necessary information is acquired reliably before the terminal receives all LP-WUS signals. However, it is not clear how to implement the early termination mechanism for a system in which all LP-WUS information bits are transmitted by overlaid OFDM sequences, making it difficult to optimize the reception process.

[0022] Furthermore, the OFDM sequence overlaid on each ON-chip may differ depending on the LP-WUS information bits. However, in the past, it was unclear how to map the LP-WUS information bits to the information bits carried by the overlaid OFDM sequence, which may make it difficult to efficiently perform LP-WUS transmission using the overlaid OFDM sequence.

[0023] In addition, in LP-WUS, repeated transmission is important to improve reliability. However, it is not clear how to apply the repetition of the overlaid OFDM sequence on-chip within an OFDM symbol.

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

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

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

[0027] A common OFDM sequence X may be applied to any information bit as an overlaid OFDM sequence on the 1 of the OOK symbol. For example, when information bit 0 is modulated to 0 and 1 of the OOK symbol, OFDM sequence X may be applied to this 1, and when information bit 1 is modulated to 1 and 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 for the 1 of the OOK symbol. For example, when information bit 0 is modulated to 0 and 1 of the OOK symbol, OFDM sequence X may be applied to this 1, and when information bit 1 is modulated to 1 and 0 of the OOK symbol, OFDM sequence Y may be applied to this 1. Here, the OFDM sequences X and Y may generate different sequences, or different parts of a common sequence A may be used. For example, the first half of sequence A may be X and the second half Y.

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

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

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

[0032] Example 1 In the first embodiment, a method for transmitting an overlaid OFDM sequence indicating information bits, i.e., how the overlaid OFDM sequence should be arranged (overlaid) on an OOK symbol, is specified. According to the first embodiment, an OFDM sequence associated with an information bit string including LP-WUS information bits in order from the front or rear information bits is overlaid on an OOK symbol.

[0033] (Example 1-1) In Example 1-1, the information bits indicated by the overlaid OFDM sequence are arranged in the OOK symbol in order from before the LP-WUS information bits (bit string).

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

[0035] An example of allocation of an overlaid OFDM sequence to an OOK symbol when the LP-WUS information bit string in Example 1-1 is '10010111' will be described with reference to FIGS. 2A to 2C.

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

[0037] 2A shows an example in which an OFDM sequence transmits (carries or carries) one bit. As shown in FIG. 2A, overlaid OFDM sequence #1 indicating '1', which corresponds to the first bit (i.e., the most significant bit (MSB)) '1' of the LP-WUS information bit string '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2 indicating '0', which corresponds to the bit (second bit) after the first bit of the LP-WUS information bit string '10010111', is placed in the second OOK "ON" symbol. Repeated in the same manner, overlaid OFDM sequence #8 indicating '1', which corresponds to the last bit (eighth bit) '1' of the LP-WUS information bit string '10010111', is placed in the last OOK "ON" symbol.

[0038] Thus, in the example of Figure 2A, the information bits indicated by the overlaid OFDM sequence, which transmits one bit, are placed in the OOK "ON" symbol in order from the front of the LP-WUS information bit string in units of one bit transmitted by the overlaid OFDM sequence.

[0039] 2B shows an example in which an OFDM sequence transmits two bits. As shown in FIG. 2B, overlaid OFDM sequence #1 indicating '10', which corresponds to the first two bits (1st and 2nd bits) of the LP-WUS information bit string '10010111' (which are '10'), is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2 indicating '01', which corresponds to the next two bits (3rd and 4th bits) of the LP-WUS information bit string '10010111' (which are '01'), is placed in the second OOK "ON" symbol. Repeating in the same manner, overlaid OFDM sequence #4 indicating '11', which corresponds to the last two bits (7th and 8th bits) of the LP-WUS information bit string '10010111' (which are '11'), is placed in the fourth OOK "ON" symbol.

[0040] Thus, in the example of Figure 2B, the information bits indicated by the overlaid OFDM sequence transmitting two bits are placed in the OOK "ON" symbols in order from the front of the LP-WUS information bit string in units of two bits transmitted by the overlaid OFDM sequence.

[0041] 2C shows an example in which an OFDM sequence transmits four bits. As shown in FIG. 2C, overlaid OFDM sequence #1 indicating '1001', which corresponds to the first four bits (1st to 4th bits) '1001' of the LP-WUS information bit string '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2 indicating '0111', which corresponds to the next four bits (5th to 8th bits) '0111' after the first four bits of the LP-WUS information bit string '10010111', is placed in the second OOK "ON" symbol.

[0042] Thus, in the example of Figure 2C, the information bits indicated by the overlaid OFDM sequence carrying 4 bits are placed in the OOK "ON" symbols in order from the front of the LP-WUS information bit string in 4-bit units carried 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 symbol in order from the end of the LP-WUS information bits (bit string).

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

[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" symbol for each overlaid OFDM sequence in order from the end of the LP-WUS information bit string. "For each overlaid OFDM sequence" may refer to the unit of information bits (number of information bits) transmitted by the overlaid OFDM sequence.

[0046] An example of allocation of an overlaid OFDM sequence to an OOK symbol when the LP-WUS information bit string in Example 1-2-1 is '10010111' will be described with reference to FIGS. 3A to 3C.

[0047] 3A shows an example in which an OFDM sequence transmits one bit. As shown in FIG. 3A, overlaid OFDM sequence #1 indicating '1', which corresponds to the last bit (8th bit) '1' of the LP-WUS information bit string '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2 indicating '1', which corresponds to the bit (7th bit) next to the last bit in the reverse order of the LP-WUS information bit string '10010111', is placed in the second OOK "ON" symbol. The same process is repeated, and overlaid OFDM sequence #8 indicating '1', which corresponds to the first bit (1st bit) '1' of the LP-WUS information bit string '10010111', is placed in the last OOK "ON" symbol.

[0048] Thus, in the example of Figure 3A, the information bits indicated by the overlaid OFDM sequence, which transmits one bit, are placed in the OOK "ON" symbol in order from the end of the LP-WUS information bit string in units of one bit transmitted by the overlaid OFDM sequence.

[0049] 3B shows an example in which an OFDM sequence transmits two bits. As shown in FIG. 3B, overlaid OFDM sequence #1 indicating '11', which corresponds to the last two bits (7th and 8th bits) of the LP-WUS information bit string '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2 indicating '01', which corresponds to the next two bits (5th and 6th bits) from the last two bits in the LP-WUS information bit string '10010111' in reverse order, is placed in the second OOK "ON" symbol. The same process is repeated, and overlaid OFDM sequence #4 indicating '10', which corresponds to the first two bits (1st and 2nd bits) of the LP-WUS information bit string '10010111', is placed in the fourth OOK "ON" symbol.

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

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

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

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

[0054] An example of allocation of an overlaid OFDM sequence to an OOK symbol when the LP-WUS information bit string in Example 1-2-2 is '10010111' will be described with reference to FIGS. 4A to 4C.

[0055] FIG. 4A shows an example in which an OFDM sequence transmits one bit. As shown in FIG. 4A, the LP-WUS information bit sequence '10010111' is inverted to produce an LP-WUS information bit sequence '11101001'. Overlaid OFDM sequence #1 indicating '1', which corresponds to the first bit (first bit) '1' of the inverted LP-WUS information bit sequence '11101001', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2 indicating '1', which corresponds to the next bit (second bit) '1' of the inverted LP-WUS information bit sequence '11101001', is placed in the second OOK "ON" symbol. The same process is repeated, and overlaid OFDM sequence #8 indicating '1', which corresponds to the last bit (eighth bit) '1' of the inverted LP-WUS information bit sequence '11101001', is placed in the last OOK "ON" symbol.

[0056] Thus, in the example of FIG. 4A, the information bits indicated by the overlaid OFDM sequence transmitting one bit are arranged in the OOK "ON" symbols bit by bit in order from the end of the LP-WUS information bit string.

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

[0058] Thus, in the example of FIG. 4B, the information bits indicated by the overlaid OFDM sequence transmitting two bits are arranged in the OOK "ON" symbols bit by bit in order from the end of the LP-WUS information bit string.

[0059] 4C shows an example in which an OFDM sequence transmits four bits. As shown in FIG. 4C, the LP-WUS information bit sequence '10010111' is inverted to obtain '11101001'. Overlaid OFDM sequence #1 indicating '1110', which corresponds to the first four 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 indicating '1001', which corresponds to the next four 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 of FIG. 4C, the information bits indicated by the overlaid OFDM sequence transmitting 4 bits are arranged in the OOK "ON" symbols bit by bit in order from the end of the LP-WUS information bit string.

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

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

[0063] For example, if the overlaid OFDM sequence transmits two bits, the LP-WUS information bit string may be divided into two-bit groups starting from the beginning. As shown in Fig. 5A, the LP-WUS information bit string '10010111' may be divided into two-bit groups starting from the beginning, with '10' (the first and second bits) set to bit group #1, '01' (the third and fourth bits) set to bit group #2, '01' (the fifth and sixth bits) set to bit group #3, and '11' (the sixth and seventh bits) set to bit group #4.

[0064] For example, when the overlaid OFDM sequence transmits two bits, the LP-WUS information bit string may be divided into bit groups for each information bit indicated by the overlaid OFDM sequence. As shown in Fig. 5B, the LP-WUS information bit string '10010111' may be divided into two bits from the front, with '10' (the first and second bits) set to bit group #1, '01' (the third and fourth bits) set to bit group #2, '01' (the fifth and sixth bits) set to bit group #3, and '11' (the sixth and seventh bits) set to bit group #3. As shown in Fig. 5B, for example, information bit '00' may be set to bit group #4.

[0065] For example, if the overlaid OFDM sequence transmits four bits, the LP-WUS information bit string may be divided into four-bit groups starting from the top. As shown in Fig. 5C, the LP-WUS information bit string '10010111' may be divided into four-bit groups starting from the top, with '1001' (the first to fourth bits) being set to bit group #1, and '0111' (the fifth to eighth bits) being set to bit group #2.

[0066] For example, if the overlaid OFDM sequence transmits four bits, the LP-WUS information bit string may be divided into bit groups for each information bit indicated by the overlaid OFDM sequence. As shown in Fig. 5D, the LP-WUS information bit string '10010111' may be divided into four bits from the front, with '1001' (the first to fourth bits) being set to bit group #1, and '0111' (the fifth to eighth bits) being set to bit group #2. As shown in Fig. 5D, for example, the information bit '1001' may be set to bit group #3, and the 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 may be any index.

[0069] (Example 1-3-1) According to Example 1-3-1, the relationship between the bit groups and the corresponding information bits may be determined based on a predefined rule. 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 the bit groups and the corresponding information bits may be set or indicated to the terminal 20 by a predetermined signal from the network (e.g., the base station 10). The relationship between the bit groups and the corresponding information bits 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, a System Information Block (SIB), a Radio Resource Control (RRC), a Medium Access Control Element (MAC CE), or a Downlink Control Information (DCI).

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

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

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

[0074] According to the first embodiment, 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, which facilitates the introduction of an early termination mechanism. As a result, it is possible to reduce the power consumption of the terminal and improve the efficiency of the receiving process.

[0075] According to Examples 1-3, the LP-WUS information bits are interleaved and allocated to the OOK "ON" symbols, thereby improving the error tolerance due to fading and interference. By distributing the information bits as different bit groups, even if a specific OOK "ON" symbol is lost, the entire information can be restored, thereby realizing highly reliable LP-WUS communication.

[0076] Example 2 Example 2 shows a method for repeating an overlaid OFDM sequence in an OOK symbol. The repetition of an overlaid OFDM sequence may refer to the repetition of information bits or the repetition of information bits indicated by the overlaid OFDM sequence.

[0077] This improves the reception reliability of LP-WUS by repeatedly applying the overlaid OFDM sequence placed in the OOK symbol. By placing the overlaid OFDM sequence representing the same information bit in multiple OOK "ON" symbols, the receiving terminal can detect the information bit more reliably, 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 every information bit level.

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

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

[0081] In the example of Figure 6A, the overlaid OFDM sequences arranged in the first and subsequent OOK "ON" symbols are sequentially repeated in the remaining (i.e., fifth and subsequent) OOK "ON" symbols. For example, the overlaid OFDM sequences arranged in the first to fourth OOK "ON" symbols are respectively repeated in the fifth to eighth OOK "ON" symbols.

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

[0083] 6B, overlaid OFDM sequence #1 indicating '1001', which corresponds to the first four bits (1st to 4th bits) '1001' of the LP-WUS information bit string '10010111', is placed in the first OOK "ON" symbol. Overlaid OFDM sequence #2 indicating '0111', which corresponds to the next four bits (5th to 8th bits) '0111' after the first four bits of the LP-WUS information bit string '10010111', is placed in the second OOK "ON" symbol.

[0084] In the example of Figure 6B, the overlaid OFDM sequences placed in the first and second OOK "ON" symbols are repeated 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, so even if a specific OOK "ON" symbol cannot be received, the possibility of recovering information from other symbols increases. This makes it possible to improve the success rate of LP-WUS reception 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 in units of bit groups.

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

[0088] As shown in Figure 7A, the overlaid OFDM sequence indicating '1', which corresponds to the first bit (MSB) '1' of the LP-WUS information bit string '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', which corresponds to the second bit '0' of the LP-WUS information bit string '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', which corresponds to the third bit '0' of the LP-WUS information bit string '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', which corresponds to the fourth bit '1' of the LP-WUS information bit string '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] 7B shows an example of repetition of the overlaid OFDM sequence in Example 2-2 when the LP-WUS information bit string is '10010111' and the overlaid OFDM sequence transmits two bits. In the example of FIG. 7B, information bits '10', '01', and '11' are associated with bit groups #1, #2, and #3, respectively.

[0093] 7B, the overlaid OFDM sequence indicating '10', which corresponds to the first two bits (1st and 2nd bits) '10' of the LP-WUS information bit string '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', which corresponds to the next two bits (the third and fourth bits) of the LP-WUS information bit string '10010111' being '01', 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', which corresponds to the next two bits (5th and 6th bits) of the LP-WUS information bit string '10010111', is placed in the fifth OOK "ON" symbol. The overlaid OFDM sequence indicating '01' associated with bit group #2 is repeatedly placed in the sixth OOK "ON" symbol.

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

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

[0098] 7C, the overlaid OFDM sequence indicating '1001', which corresponds to the first four bits (1st to 4th bits) '1001' of the LP-WUS information bit string '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', which corresponds to the next four bits (5th-8th bits) '0111' after the first four bits of the LP-WUS information bit string '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 fifth and sixth OOK "ON" symbols, the overlaid OFDM sequence indicating '1001' associated with bit group #1 is repeated. In the seventh and eighth OOK "ON" symbols, the overlaid OFDM sequence indicating '0111' associated with bit group #2 is repeated.

[0101] According to Example 2-2, in the OOK "ON" symbol, the overlaid OFDM sequence is repeated for each bit group, thereby enabling efficient use 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 first and second embodiments may be used in combination.

[0103] Example 3 In the above-described second embodiment, a method for repeatedly setting an overlaid OFDM sequence in an OOK symbol has been described. In the third embodiment, a method for determining the number of repetitions of an overlaid OFDM sequence in an OOK symbol is shown. This makes it possible to reduce redundant signal transmission while maintaining communication quality by appropriately controlling the number of repetitions of an overlaid OFDM sequence placed in an OOK symbol. This makes it possible to adaptively set the number of repetitions according to the communication environment and the characteristics of a terminal, which contributes to optimizing power consumption and suppressing false detection.

[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 the terminal 20 is greater than / less than a predetermined threshold. The communication quality may be, for example, at least one of 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 repetitions of the overlaid OFDM sequence may be determined based on whether the false alarm rate (FAR) is greater than or less than a predetermined threshold, where FAR is calculated as False Alarms / Total Non-Event Trials.

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

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

[0109] In Example 3-2, the 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 the terminal 20. The default value for the number of repetitions may be, for example, a value defined in advance by a specification (for example, a 3GPP specification), or may be set or instructed by the base station 10 via an SIB, an RRC, a MAC CE, or a DCI.

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

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

[0112] For example, the terminal 20 may determine the number of repetitions based on the type of the LP-WUS receiver. The type of LP-WUS receiver may be the type of reception scheme (e.g., OOK-based LR (Low-power Reception), OFDM-based LR). OOK-based LR is the lowest power consumption reception scheme and is a reception scheme that uses OOK scheme with simple ON / OFF signaling. OFDM-based LR is a reception scheme that uses low power consumption OFDM scheme and achieves more reliable communication than OOK. The type of LP-WUS receiver may be set as a parameter of the terminal capability of the terminal 20. The base station 10 may determine an appropriate number of repetitions based on the terminal capability that indicates the type of LP-WUS receiver reported from the terminal 20. The base station 10 may set or instruct the terminal 20 to determine the number of repetitions determined based on the terminal capability via SIB, RRC, MAC CE, or DCI.

[0113] In Example 3-3, the terminal 20 may assume a default value for the number of repetitions based on the terminal capability. That is, a default value for the number of repetitions based on the terminal capability may be set for the terminal 20. The default value for the number of repetitions based on the terminal capability may be, for example, a value defined in advance by a specification (for example, a 3GPP specification), or may be set or instructed by the base station 10 via an SIB, an RRC, a MAC CE, or a DCI.

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

[0115] (Examples 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 the embodiment 3-4-1, a switching timer for the number of repetitions may be defined, and the switching timer for the number of repetitions may be determined based on a DRX (Discontinuous Reception) cycle.

[0117] For example, the valid period "Y" of the switching timer may be determined based on the formula Y = DRX cycle / X. The DRX cycle in this formula may have a different value 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 to the terminal 20 from the network (base station 10) or may be defined by specifications (for example, 3GPP specifications).

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

[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 detection of a change in the SSB index of an RRM (Radio Resource Management) measurement due to a change in 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] (Examples 3-5) In Examples 3-5, a formula for determining the number of repetitions is defined. 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 overlaid OFDM. Noc represents the number of ON chips for OOK.

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

[0123] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions of the embodiments.

[0124] <Base station> Fig. 8 is a diagram showing an example of the functional configuration of the base station 10 in this embodiment. As shown in Fig. 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 Fig. 8 is merely an example. The functional divisions and names of the functional units may be any names as long as they can execute the operations according to this embodiment.

[0125] The transmitter 110 includes a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The transmitter 110 also transmits setting information, instructions, notifications, etc. related to a low-power wake-up signal to the terminal 20. The transmitter 110 also transmits notifications related to switching of monitoring operations to the terminal. The receiver 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of higher layers from the received signals. The transmitter 110 also has a function of transmitting PSS, SSS, PBCH, DL / UL control signals, etc. to the terminal 20. The receiver 120 also receives inter-network node messages from other network nodes.

[0126] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information is, for example, information related to measurements of low-power signals.

[0127] As described in the embodiments, the control unit 140 controls settings, instructions, and notifications related to low-power wake-up signals, etc. A functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

[0128] <terminal> Fig. 9 is a diagram showing an example of the functional configuration of the terminal 20 in this embodiment. As shown in Fig. 9, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 9 is merely an example. As long as the operations according to this embodiment can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0129] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The transmitter 210 also transmits capability information related to the low-power wake-up signal to the base station 10. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The receiver 220 also has a function of receiving PSS, SSS, PBCH, DL / UL / SL control signals, and the like transmitted from the base station 10. The receiver 220 also receives paging notification information and configuration information, instructions, and notifications related to the low-power wake-up signal from the base station 10. For example, the receiver 220 receives the low-power wake-up signal from the base station 10. The configuration unit 230 stores various configuration information received by the receiver 220 from the base station 10. The configuration unit 230 also stores pre-configured configuration information. The configuration information includes, for example, information related to measurements of the low-power signal.

[0130] As described in the embodiments, the control unit 240 controls the settings, instructions, and notifications related to the low-power wake-up signal. The function unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the function unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0131] (Hardware configuration) The block diagrams (FIGS. 8 and 9) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or the multiple devices with software.

[0132] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0133] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 10 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0134] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0135] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0136] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0137] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 8 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 9 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0138] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0139] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0140] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0141] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, 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 may be configured using different buses between each device.

[0143] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0144] Fig. 11 shows an example configuration of a vehicle 2001. As shown in Fig. 11, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0145] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0146] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0147] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a front or rear wheel rotation speed signal obtained by a rotation speed sensor 2022, a front or rear wheel air pressure signal obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0148] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information acquired from external devices via the communication module 2013 or the like to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001. The information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that output information to the outside.

[0149] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as a millimeter-wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0150] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[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 an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0152] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0153] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0154] <Additional notes> (Additional note 1) a receiver for monitoring a low-power wake-up signal from a base station; a control unit that acquires the information bits corresponding to the symbols based on an OFDM sequence overlaid on the symbols corresponding to the information bits of the low power wake-up signal; A terminal in which the OFDM sequence associated with the information bits in order from the earliest information bits or the latest information bits in an information bit string including the information bits is overlaid on the symbol.

[0155] (Additional note 2) The terminal according to Supplementary Claim 1, wherein the number of the preceding information bits or the following information bits associated with the OFDM sequence is the number of information bits carried by the OFDM sequence.

[0156] (Additional note 3) 2. The terminal according to claim 1, wherein the OFDM sequence associated with the information bits in the inverted information bit sequence in order from the previous information bit in the inverted information bit sequence is overlaid on the symbol.

[0157] (Additional note 4) 2. The terminal according to claim 1, wherein each of the OFDM sequences associated with the information bits is repeatedly overlaid.

[0158] (Additional note 5) 2. The terminal of claim 1, wherein the number of repetitions of each of the OFDM sequences is determined based on the number of information bits carried by the OFDM sequence.

[0159] (Additional note 6) A communication method performed by a terminal, comprising: monitoring a low power wake-up signal from a base station; and obtaining the information bits corresponding to the OOK symbols based on an OFDM sequence overlaid on symbols corresponding to information bits of the low-power wake-up signal; A communication method, wherein the OFDM sequence associated with the information bits in an information bit string including the information bits in order from the earlier information bits or the later information bits 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 information bit allocation method and the number of repetitions using the above configurations, it is possible to achieve low-power, highly reliable LP-WUS communication.

[0161] (Supplementary explanation of the embodiment) Although the present embodiment has been described above, the disclosed invention is not limited to such an embodiment, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; features described in two or more items may be used in combination as needed, and features described in one item may apply to features described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station and terminal have been described using functional block diagrams. However, such devices may be implemented using 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 each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0162] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0163] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other suitable system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0164] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0165] In this specification, a specific operation that is described as being performed by a base station may also be performed by its upper node in some cases. 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 may be performed by at least one of the base station and another network node other than the base station (for example, an MME or an S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than 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 the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0167] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0168] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0169] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0170] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0171] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0172] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0173] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0174] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0175] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0176] In the present disclosure, terms such as "base station (BS)," "radio base station," "base station device," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. 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. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0178] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0179] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. 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 some other suitable terminology.

[0181] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be a mobile object that moves autonomously based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0182] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal may be configured to have the functions of the base station described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0183] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0184] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0185] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

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

[0187] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0188] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

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

[0190] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0191] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0192] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0193] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0194] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0195] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[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. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[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 performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each terminal) to each terminal in TTI units. However, the definition of TTI is not limited to this.

[0198] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0199] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0200] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0201] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0202] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0203] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0204] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0205] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0206] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within the BWP.

[0207] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0208] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0209] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0210] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0211] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0212] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0213] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0214] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device 2001 Vehicle 2002 Drive unit 2003 Steering section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. a receiver for monitoring a low-power wake-up signal from a base station; a control unit that acquires the information bits corresponding to the symbols based on an Orthogonal Frequency Division Multiplexing (OFDM) sequence overlaid on the symbols corresponding to the information bits of the low power wake-up signal; A terminal in which the OFDM sequence associated with the information bits in order from the earliest information bits or the latest information bits in an information bit string including the information bits is overlaid on the symbol.

2. The terminal according to claim 1 , wherein the number of the preceding information bits or the 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 corresponding to the information bits in the inverted information bit sequence in order from the previous information bit in the inverted information bit sequence is overlaid on the symbol.

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

5. The terminal of claim 1 , wherein the number of repetitions of each of the OFDM sequences is determined based on the number of information bits that the OFDM sequence carries.

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

Images