Method and device for transmitting and receiving signals in wireless communication system

Abstract

The present disclosure relates to a method performed by a base station in a wireless communication system, the method comprising the steps of: determining an overlaid sequence for a low power-wake up signal (LP-WUS) for a first receiver of a terminal; and transmitting the LP-WUS on the basis of the overlaid sequence, wherein one overlaid sequence per specific unit is used for symbols of the LP-WUS, and the specific unit is determined on the basis of a specific signal transmitted from the base station.

Description

Method and device for transmitting and receiving signals in a wireless communication system

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

[0002] Wireless communication systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA).

[0003] The technical problem to be achieved by the present invention is to provide a method for efficiently transmitting and receiving wireless communication signals and a device therefor.

[0004] The technical problems of the present invention are not limited to the technical problems described above, and other technical problems can be inferred from the embodiments of the present invention.

[0005] The present invention provides a method and device for transmitting and receiving signals in a wireless communication system.

[0006] As one aspect of the present invention, a method performed by a terminal in a wireless communication system is provided, comprising: receiving a LP-WUS (Low Power-Wake Up Signal) through a first receiver of the terminal; and operating a second receiver of the terminal that has been stopped based on reception of the LP-WUS; wherein one or more overlaid sequences are used for symbols of the LP-WUS, and a length of one of the one or more overlaid sequences is determined based on a specific signal of a base station.

[0007] As another aspect of the present invention, a device for performing the above method is provided, comprising a terminal, a processor, and a storage medium.

[0008] In another aspect of the present invention, a method performed by a base station in a wireless communication system is provided, comprising: determining an overlaid sequence for a LP-WUS (Low Power-Wake Up Signal) for a first receiver of a terminal; and transmitting the LP-WUS based on the overlaid sequence; wherein one overlaid sequence is used per specific unit for symbols of the LP-WUS, and the specific unit is determined based on a specific signal transmitted from the base station.

[0009] As another aspect of the present invention, a device for performing the method is provided, comprising a base station, a processor, and a storage medium.

[0010] The above devices may include at least a terminal, a network, and an autonomous vehicle capable of communicating with other autonomous vehicles other than the above devices.

[0011] The above-described aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present invention described below.

[0012] According to one embodiment of the present invention, when a signal is transmitted and received between communication devices, there is an advantage in that more efficient signal transmission and reception can be performed through operations differentiated from those of the prior art.

[0013] The technical effects of the present invention are not limited to the technical effects described above, and other technical effects can be inferred from the embodiments of the present invention.

[0014] Figure 1 illustrates the structure of a radio frame.

[0015] Figure 2 illustrates a resource grid of slots.

[0016] Figure 3 shows an example of physical channels being mapped within a slot.

[0017] FIGS. 4 to 10 are drawings for explaining a signal transmission and reception method according to an embodiment of the present invention.

[0018] Figures 11 to 14 illustrate devices according to embodiments of the present invention.

[0019] The following technologies can be used in various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. CDMA can be implemented using wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0020] For clarity, the description is based on a 3GPP communication system (e.g., LTE, NR), but the technical idea of ​​the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" refers to a standard document detail number. LTE / NR may be collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, reference may be made to matters described in standard documents published prior to the present invention. For example, reference may be made to the following documents.

[0021] 3GPP NR

[0022] - 38.211: Physical channels and modulation

[0023] - 38.212: Multiplexing and channel coding

[0024] - 38.213: Physical layer procedures for control

[0025] - 38.214: Physical layer procedures for data

[0026] - 38.300: NR and NG-RAN Overall Description

[0027] - 38.331: Radio Resource Control (RRC) protocol specification

[0028] Figure 1 illustrates the structure of a radio frame used in NR.

[0029] In NR, uplink (UL) and downlink (DL) transmissions are structured as frames. A radio frame is 10ms long and is defined as two 5ms half-frames (HF). Each half-frame is defined as five 1ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols, depending on the cyclic prefix (CP). When normal CP is used, each slot contains 14 symbols. When extended CP is used, each slot contains 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

[0030] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0031] [Table 1]

[0032]

[0033] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0034] [Table 2]

[0035]

[0036] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) may be set differently between multiple cells that are merged into a single user equipment (UE). Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells.

[0037] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) numerologies (e.g., subcarrier spacing, SCS) to support various 5G services. For example, a 15 kHz SCS supports wide areas in traditional cellular bands, while a 30 kHz / 60 kHz SCS can support dense urban areas, lower latency, and wider carrier bandwidth.

[0038] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 can be configured as shown in Table 3 below. FR2 can also refer to millimeter wave (mmW).

[0039] [Table 3]

[0040]

[0041] Figure 2 illustrates the slot structure of an NR frame.

[0042] A slot contains multiple symbols in the time domain. For example, for a normal CP, one slot contains 14 symbols, and for an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interlaces (simply, interlaces) can be defined in the frequency domain. An interlace m ∈ {0, 1, ..., M-1} can be composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}. M represents the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive RBs (e.g., physical RBs, PRBs) in the frequency domain, and can correspond to one OFDM numerology (e.g., SCS(u), CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal within a single cell / carrier. Each element in the resource grid is referred to as a Resource Element (RE), to which a single modulation symbol can be mapped.

[0043] In a wireless communication system, a terminal receives information from a base station via the downlink (DL), and the terminal transmits information to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels / signals exist depending on the type / purpose of the information they transmit and receive. A physical channel corresponds to a set of resource elements (REs) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (REs) used by the physical layer (PHY), but does not carry information derived from a higher layer. The higher layers include the Medium Access Control (MAC) layer, the Radio Link Control (RLC) layer, the Packet Data Convergence Protocol (PDCP) layer, and the Radio Resource Control (RRC) layer.

[0044] DL physical channels include Physical Broadcast Channel (PBCH), Physical Downlink Shared Channel (PDSCH), and Physical Downlink Control Channel (PDCCH). DL physical signals include DL Reference Signal (RS), Primary Synchronization Signal (PSS), and Secondary Synchronization Signal (SSS). DL RS includes Demodulation RS (DM-RS), Phase-tracking RS (PT-RS), and Channel-state information RS (CSI-RS). UL physical channels include Physical Random Access Channel (PRACH), Physical Uplink Shared Channel (PUSCH), and Physical Uplink Control Channel (PUCCH). UL physical signals include UL RS. UL RS includes DM-RS, PT-RS, and Sounding RS (SRS).

[0045] Figure 3 shows an example of physical channels being mapped within a slot.

[0046] A DL control channel, DL or UL data, and UL control channel can all be included in a single slot. For example, the first N symbols in a slot can be used to transmit a DL control channel (hereinafter, DL control region), and the last M symbols in the slot can be used to transmit a UL control channel (hereinafter, UL control region). N and M are each integers greater than or equal to 0. A resource region (hereinafter, data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. A time gap for DL-to-UL or UL-to-DL switching can exist between the control region and the data region. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot can be used as a time gap.

[0047] In the present invention, the base station may be, for example, a gNodeB.

[0048] LP-WUS (Low Power Wake-Up Signal)

[0049] The contents discussed above can be applied in combination with the methods proposed in the present invention described below, or can be supplemented to clarify the technical features of the methods proposed in the present invention.

[0050] In addition, the methods described below can be equally applied to the NR system (licensed band) or shared spectrum described above, and the technical ideas proposed in this specification can be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so that they can be implemented in the corresponding systems.

[0051] In the Rel-18 NR standard, discussions are underway to introduce a low power wake-up signal (LP-WUS) and a separate receiver that can receive it, LP-WUR (low power wake-up receiver or low power wake-up radio), as a power consumption reduction method that is slightly different from the terminal power consumption reduction techniques introduced / supported in Rel-16 / 17, etc. When expressing the receiver in the terminal (receiver in the downlink) in the existing NR system as MR (Main radio / receiver), LP-WUR means a separate receiver (i.e. companion radio / receiver) that can be introduced to reduce the power consumption of the MR. LP-WUR can be simply expressed as LR.

[0052] Below, we describe options for generating LP-WUS waveforms. These can be understood as different methods for generating MC-OOK (Multi-carrier On-Off Keying) and MC-FSK (Multi-carrier Frequency Shift Keying) waveforms.

[0053] Figures 4 to 7 illustrate options for the LP-WUS waveform generation method.

[0054] Figures 4 to 7 are related to MC-ASK (amplitude shift keying) waveform generation. In Figures 4 to 7, K is the iFFT (inverse fast Fourier transform) size of CP-OFDMA (Cyclic Prefix-Orthogonal Frequency Division Multiplexing Access), and N is the number of subcarriers used in LP-WUS, including a potential guard band.

[0055] Figure 4 shows option OOK-1.

[0056] In option OOK-1, one OFDM symbol contains a single bit. For the subcarriers of LP-WUS, OOK=1 means that all subcarriers are modulated. OOK=0 means that all subcarriers are at zero power (from the baseband perspective).

[0057] Figure 5 shows option OOK-2.

[0058] Referring to Figure 5, Option OOK-2 includes M bits of OOK in parallel within the frequency domain. The N subcarriers of LP-WUS are divided into M segments. Guard bands may be included between and / or around each segment. OOK=1 means that all subcarriers within the segment are modulated. OOK=0 means that all subcarriers within the segment are at zero power (from a baseband perspective).

[0059] Figure 6 shows option OOK-3.

[0060] Referring to FIG. 6, option OOK-3 corresponds to a multi-tone single-bit OOK. The N subcarriers of LP-WUS are divided into L segments. There is no guard band between segments, and there may be guard bands around the segments. OOK=1 means that one subcarrier (recognized by the UE) of each segment is modulated, and the remaining subcarriers are at zero power (from the baseband perspective). OOK=0 means that all subcarriers within the segment are at zero power (from the baseband perspective).

[0061] Figure 7 shows option OOK-4.

[0062] Referring to Fig. 7, in option OOK-4, an M-bit OOK in the time domain is transformed. N subcarriers of OOK-1 are generated by a transformation (DFT / Least Square). N' samples are generated from the M bits. Signal modification may or may not be used. Truncation or other additional modifications may or may not be used. If not used, N and N' are the same. N' can be equal to K.

[0063] In FIGS. 4 to 7, the modulated subcarriers may be, for example, QAM (Quadrature Amplitude Modulation) symbols, sequences, or other signals.

[0064] The subcarriers in the potential guard band are zero power (from the baseband perspective). Optionally, one of the two additional segments can be always modulated and the other can always be transmitted at zero power (from the baseband perspective).

[0065] Symbols modified in the OOK manner may be referred to as OOK symbols. For convenience, "OOK-1 and / or OOK-4" may be simply written as "OOK-1 / 4."

[0066] For OOK-1, one OOK symbol can be matched to one OFDM symbol interval, and for OOK-4, M OOK symbols can be mapped to one OFDM symbol interval. Therefore, OOK-1 can transmit 1 bit per OFDM symbol, and OOK-4 can transmit M bits per OFDM symbol. If MC (Manchester encoding) is additionally used for LP-WUS, twice as many OFDM symbols may be required to transmit the same bit. Meanwhile, a terminal (including LP-WUR) that receives LP-WUS can perform an MR wake-up operation. For this purpose, an ID (identifier) ​​that can distinguish each terminal or a (sub)group of terminals can be included in the LP-WUS signal. The UE ID can be (for example) a 5G-S-TMSI value or a value reduced by modulo operation, etc. This value can be approximately 48 bits depending on the ID used. Accordingly, a significant number of OFDM symbols may be used to transmit a UE ID via OOK-1 / 4. For example, assuming the use of MC to transmit a 48-bit UE ID, 96 OFDM symbols are required for OOK-1. When the part containing information such as the UE ID is called the message part of LP-WUS, if a preamble part to assist in receiving the message part is transmitted together, the number of OFDM symbols required may increase. The preamble part can convey information necessary for LR to detect / decode the message part. Fig. 8 shows an example of LP-WUS transmission including a preamble part and a message part.

[0067] If an LP-WUS signal transmitted to a specific terminal (or group of terminals) occupies a specific (frequency / time) channel for a certain period of time, it may result in inefficient use of resources for both the network and the terminal. From the perspective of receiving the LP-WUS signal, it may be vulnerable to interference. Furthermore, if accurate time synchronization is not secured, LP-WUR may have to attempt monitoring for a period of time longer than the actual length of the LP-WUS signal. When the LP-WUS signal is composed of a preamble part and a message part, an effective signal configuration and setting method is required.

[0068] Meanwhile, the LP-WUS signal may use an overlaid sequence together with the OOK waveform. Depending on how the overlaid sequence is overlaid on each OOK signal or OFDM signal, it may affect the LP-WUS transmission time and / or the frequency resources occupied by the LP-WUS. Additionally, if some information is transmitted through the overlaid sequence, this may be a way to expand the utilization of the LP-WUS signal. However, not all LP-WUSs can detect / decode the overlaid sequence. If the overlaid sequence modulates each subcarrier in the frequency domain, only LP-WUSs that have FFT and / or frequency-domain sequence correlation capabilities can receive the overlaid sequence. Even if the sequence is overlaid on each OOK symbol or OFDM symbol in the time domain, only LP-WUSs that have sequence correlation capabilities in the time domain can receive the sequence. Since the lowest complexity LP-WUR may only distinguish ON / OFF of the OOK symbol, the overlay sequence needs to be designed considering these various types of LP-WUR.

[0069] Meanwhile, a separate LP-SS (low power synchronization signal) may be defined and transmitted to synchronize the time / frequency required for receiving the LP-WUR transmitted from the LP-WUR. The LP-SS may be a signal / waveform generated according to an OOK or FSK waveform generation method (similar to the LP-WUS), and an overlay sequence may be applied. The LP-SS may be a signal transmitted periodically or aperiodically. Based on the LP-SS, the LP-WUR may measure the power of the received signal, etc., to offload or relax the RRM measurement of the MR.

[0070] As described above, the LP-WUS signal (transmitted by the base station) can be composed of a preamble part and a message part. The preamble part can include information necessary for receiving the message part transmitted subsequently (e.g., data rate, modulation, encoding method of the message part, etc.). Alternatively, the preamble part can include a known sequence / signal without conveying any specific information. Alternatively, a separate known sequence / signal can be transmitted together before or after the preamble part. The message part can carry identification information (for a specific terminal or a (sub)group of terminals), or can simply transmit a wake-up indication for multiple terminals. Alternatively, cell-related information, emergency-related information such as ETWS (Earthquake and Tsunami Warning System) / CMAS (Commercial Mobile Alert System), tracking area, RAN (radio access network) area, SI (system information) change instructions, or system-related information (for a terminal) or paging-related information may be transmitted. In addition to the preamble part and / or the message part, a CRC (Cyclic Redundancy Check) may be transmitted. At this time, the CRC may be generated based on the preamble part and / or the message part. Depending on the setting, the CRC may not be added. Although the proposed methods of the present invention have been described assuming a preamble part, a message part and / or a CRC having such characteristics, they are not necessarily limited to LP-WUS transmission having such a structure.

[0071] In the following proposal, the occasion can mean a TO (transmission occasion) when a base station transmits a signal or a MO (monitoring occasion) when a receiver (such as an LP-WUR) monitors a signal, depending on the context. Since TO means an opportunity for a signal to be transmitted, the signal may not be transmitted at that location (depending on the configuration or the needs of the base station). MO means an opportunity to monitor a signal, so the receiver may not monitor the signal at that location (depending on the configuration or the needs / circumstances of the base station / terminal). In addition, for the convenience of writing, even if it is simply expressed as MO or TO, it can represent MO, TO, or MO and TO depending on the proposal method and context.

[0072] The following proposal assumes periodically transmitted LP-SS (unless otherwise noted). However, the proposed method and configuration can equally be applied to aperiodically transmitted LP-SS.

[0073] In the following proposal, the preamble part of LP-WUS is described as being intended to convey configuration information for transmission of subsequent message parts, or as including such information transmission part and a known sequence / signal. However, in cases where information for transmission of the message part is conveyed via LP-SS, or where the preamble part is used as a known sequence / signal (without separate information transmission), the preamble or preamble part in the proposed method described below may be replaced with LP-SS.

[0074] In this specification, the symbols '●', '■', and '◆' listed at the beginning of each paragraph can indicate vertical / horizontal relationships between descriptions within each paragraph. Specifically, '●', '■', and '◆' can indicate upper categories in that order. For example, '■' listed after '●' can be a supplementary explanation of '●'. '◆' listed after '■' can be a supplementary explanation of '■'.

[0075] The overlay sequence can be defined / set as follows. In this specification, the overlay sequence can be configured based on Opt-1 or Opt-2 below.

[0076] ● If the overlay sequence is assumed to be a length-K sequence (i.e., {s(1), ..., s(K)}), s(k) can mean the kth element of the sequence or any single element. In this case, s(k) can be a value of 0 or 1, or a value of +1 or -1.

[0077] ■ For reference, the overlay sequence applied to the OOK / OFDM symbol of LP-WUS can transmit K bits through a sequence of length K. Alternatively, approximately log2(K) bits can be transmitted through a sequence of length K.

[0078] ● Information transmission through overlay sequence

[0079] ■ Opt-1: When information is transmitted through an overlay sequence, two different sequences can be used to express 1-bit information s(k). Or, four different sequences can be used to express 2-bit information {s(k), s(k+1)}. In this way, 2^K different sequences can be used to express K-bit information {s(1), ..., s(K)}. These 2^K different sequences are expressed as seq(v), v=1,...,2^K. In this case, 2^K is 2K , which means 2 to the power of K.

[0080] ■ Opt-2: When information is transmitted through an overlay sequence, two sequences with different cyclic shifts can be used to express 1-bit information s(k). Or, four sequences with different cyclic shifts can be used to express 2-bit information {s(k), s(k+1)}. In this way, 2^K different sequences can be used to express K-bit information {s(1), ..., s(K)}. These 2^K different sequences can also be expressed as seq(v), v=1,...,2^K.

[0081] ◆ Example 1: Transmit 1 bit per OOK symbol by cyclically shifting an N-length sequence (where CS = 0 or 0.5*N)

[0082] ◆ Example 2: Transmit 2 bits per OOK symbol by cyclically shifting a sequence of length N (where CS = 0, 0.25*N, 0.5*N, or 0.75*N)

[0083] ◆ Example 3: Information of floor(N / N_D) or floor(N / N_CP) can be transmitted through a sequence of length N. N_D is the maximum delay spread (in samples), and N_CP is the CP length of OFDM or the number of (valid) samples of CP.

[0084] The overlay sequence can be mapped as follows. In the proposal described later in this specification, the mapping of the overlay can mean either the TD overlay or the FD overlay below.

[0085] ● An OOK symbol mapped to one OFDM symbol (i.e., transmitted during one OFDM symbol period) can be expressed as ook(m), m=1,..., M. ook(m) can mean the mth OOK symbol or any one OOK symbol.

[0086] ● When LP-WUS is transmitted across multiple OFDM symbols, the corresponding OFDM symbols can be expressed as ofdm(n), n=1,...,N. ofdm(n) can mean the nth OFDM symbol or any one OFDM symbol.

[0087] ● The expression that a sequence is overlaid in the time domain (TD) on an OOK / OFDM symbol can mean that each element of the sequence is multiplied by one or more (valid) samples of the OOK / OFDM symbol.

[0088] ■ For example, when the above sequence is TD overlaid, each element of the sequence may be multiplied by one or more (valid) samples of OOK / OFDM.

[0089] ■ For example, the sequence {a(0), a(1)} can be multiplied by the valid samples {b(m), b(m+1)} of OOK as {a(0)*b(m), a(1)*b(m+1)}, or the sequence {a(0), a(1)} can be multiplied by the valid samples {b(m), b(m+1), b(m+2), b(m+3)} of OOK as {a(0)*b(m), a(1)*b(m+1), a(2)*b(m+2), a(3)*b(m+3).

[0090] ● The expression that a sequence is overlaid in the FD (frequency domain) on an OOK / OFDM symbol may mean that each element of the sequence is mapped or multiplied to one or more subcarriers of the OOK / OFDM symbol.

[0091] ■ For example, when the above sequence is FD overlaid, each element of the sequence may be multiplied by one or more subcarriers.

[0092] ■ For example, the sequence {a(0), a(1)} can be multiplied by two subcarriers {f(m), f(m+1)} as {a(0)*f(m), a(1)*f(m+1)}, or the sequence {a(0), a(1)} can be multiplied by four subcarriers {f(m), f(m+1), f(m+2), f(m+3)} as {a(0)*f(m), a(1)*f(m+1), a(2)*f(m+2), a(3)*f(m+3)}.

[0093] 1) Receiver (Entity A):

[0094] [Method #A1] The terminal can receive an overlay sequence in units of OOK / OFDM symbols that constitute an LP-WUS / LP-SS signal.

[0095] [Method A1-1] The terminal can detect X s(k) per OOK symbol or per OFDM symbol.

[0096] ● When X=1:

[0097] ■ Two different sequences, either seq(v1) or seq(v2), can be TD overlaid on a single OOK / OFDM symbol. The terminal can detect one bit transmitted through the overlaid sequence through time domain correlation using the two sequences.

[0098] ● If we generalize X to any value,

[0099] ■ One of 2^X different sequences can be TD overlaid on one OOK / OFDM symbol. The base station transmits X bits by selecting one of these sequences and TD overlaying it, and the terminal can detect the X bits transmitted through the overlaid sequence through time domain correlation using the 2^X sequences.

[0100] ■ If the terminal receives LP-WUS / LP-SS through A OOK / OFDM symbols,

[0101] ◆ Alt-1: The terminal can detect the A*X bits through the overlay sequence by detecting the X bit for each OOK / OFDM symbol.

[0102] ◆ Alt-2: The terminal can detect the X bit for each OOK / OFDM symbol and decode the overlay sequence by repeatedly using the (same) sequence that transmits the same X bit for each OOK / OFDM symbol.

[0103] ■ Or, if the terminal receives M OOK symbols generated by the OOK-4 modulation method per OFDM symbol,

[0104] ◆ The terminal can detect the same X bits for each OOK symbol using the same sequence for each OOK symbol for the M OOK symbols corresponding to each OFDM symbol section. Therefore, the corresponding OOK symbol is transmitted repeatedly. The terminal detects the X bits for each OFDM symbol by receiving the overlay sequence. If the base station transmits LP-WUS / LP-SS through A OFDM symbols, the terminal can detect a total of A*X bits.

[0105] ● The above X may be determined in advance. Or, the terminal may set / be instructed to set / be instructed to set the X through a higher layer parameter. Or, the terminal may set / be instructed to set the X through a preamble part of an LP-SS signal and / or LP-WUS.

[0106] [Method A1-2] The terminal can detect X s(k) for every Y OOK symbols or Y OFDM symbols.

[0107] ● When Y=1: Same as [Method A1-1]

[0108] ● If Y is generalized to any value,

[0109] ■ One of 2^X different sequences can be TD-overlaid on (consecutive) Y OOK / OFDM symbols. The base station transmits X bits by selecting one of these sequences and TD-overlaying it, and the terminal can detect the X bits transmitted as the overlaid sequence through time domain correlation using the 2^X sequences.

[0110] ■ If the terminal receives LP-WUS / LP-SS through A OOK / OFDM symbols,

[0111] ◆ The terminal can detect floor(A / Y)*X bits or ceil(A / Y)*X bits through the overlay sequence.

[0112] ● The above Y may be determined in advance. Alternatively, the terminal may set / be instructed to set / be instructed to set Y through a higher layer parameter. Alternatively, the terminal may set / be instructed to set Y through the LP-SS signal and / or the preamble part of the LP-WUS.

[0113] [Method A1-3] The terminal can detect X s(k) for each sample group.

[0114] ● The above sample group may be a group of some (valid) samples of an OOK / OFDM symbol. For example, if the number of (valid) samples of an OOK / OFDM symbol is N, the sample group may include N / B consecutive (valid) samples. B may be a value such as 1, 2, 4, etc. B may be defined in advance, or the base station may set / indicate B through a higher layer parameter.

[0115] ■ Example 1: If the number of (valid) samples of an OOK / OFDM symbol is N=32 (=a(0), ..., a(31)) and the sample group is 32 / 4=8 consecutive samples, the four bits transmitted through the overlay sequence, i.e., {b1, b2, b3, b4}, can be mapped as follows. This allows LP-WUR to operate even at a low sampling rate.

[0116] ◆ {b1*a(0), b1*a(1), ..., b1*a(7), b2*a(0), b2*a(1), ..., b2*a(7), ..., b4*a(0), b4*a(1), ..., b4*a(7)}

[0117] ■ Example 2: Under the same conditions as above, if the sample group is one (valid) sample, it can be mapped as follows.

[0118] ◆ {b1*a(0), b2*a(1), b3*a(2), b4*a(3), ...}

[0119] ■ Example 3: The above sample group may be composed of a certain number of OOK symbol groups.

[0120] ● When X=1:

[0121] ■ Two different sequences, for example, seq(v1) and seq(v2), can be TD-overlaid on a single sample group. The base station transmits one bit per sample group by selecting one of the two sequences and TD-overlaying it. The terminal can detect one bit (transmitted via the overlaid sequence) per sample group through time domain correlation using the two sequences.

[0122] ● If we generalize X to any value,

[0123] ■ One of 2^X different sequences can be TD-overlaid on one sample group. The base station selects one of these sequences and TD-overlays it, thereby transmitting X bits for each sample group. The terminal can detect the X bits (transmitted via the overlaid sequence) for each sample group through time domain correlation using the 2^X sequences.

[0124] ■ If the terminal receives LP-WUS / LP-SS through A sample group,

[0125] ◆ Alt-1: The terminal can detect A*X bits for each sample group (via overlay sequence) by detecting X bits for each sample group.

[0126] ◆ Alt-2: The terminal can detect the X bit for each sample group (via the overlay sequence) by detecting the X bit for each sample group and repeating the (same) sequence that transmits the same X bit for each sample group.

[0127] ■ Or, if the number of sample groups per OOK / OFDM symbol generated by the base station using the OOK-4 modulation method is B,

[0128] ◆ The terminal can detect the same X bits for each M sample group corresponding to each OOK / OFDM symbol section using the same sequence for each sample group. Therefore, the corresponding OOK symbol is transmitted repeatedly. The terminal detects X bits for each OOK / OFDM symbol through the overlay sequence. If the base station transmits LP-WUS / LP-SS through A OOK / OFDM symbols, the terminal can detect a total of A*X bits.

[0129] ● The above X and B can be determined in advance. Alternatively, the terminal can set / be instructed to set / be instructed to set X and B through upper layer parameters. Alternatively, the terminal can set / be instructed to set X and B through the LP-SS signal and / or the preamble part of LP-WUS.

[0130] [Method A1-4] The terminal can detect X s(k) for each Y sample group.

[0131] ● When Y=1: Same as [Method A1-3]

[0132] ● If Y is generalized to any value,

[0133] ■ One of 2^X different sequences can be TD-overlaid on a group of (consecutive) Y samples. The base station transmits X bits by selecting one of these sequences and TD-overlaying it. The terminal can detect the X bits transmitted as the overlaid sequence through time domain correlation using the 2^X sequences.

[0134] ■ If the terminal receives LP-WUS / LP-SS through A sample group,

[0135] ◆ The terminal can detect floor(A / Y)*X bits or ceil(A / Y)*X bits through the overlay sequence.

[0136] ● The above Y may be determined in advance. Alternatively, the terminal may set / be instructed to set / be instructed to set Y through a higher layer parameter. Alternatively, the terminal may set / be instructed to set Y through the LP-SS signal and / or the preamble part of the LP-WUS.

[0137] [Method #A2] The terminal can decode the overlay sequence in subcarrier units of the LP-WUS / LP-SS signal.

[0138] The terminal can detect X s(k) per OOK / OFDM symbol. However, the overlay sequence s(k) can be detected in units of subcarriers of an OFDM symbol, not in units of (valid) samples / sample groups of OOK / OFDM or OOK symbols or OFDM symbols.

[0139] [Method A2-1] The terminal can detect one s(k) per subcarrier.

[0140] ● The terminal can set / be instructed to set the number of subcarriers for this according to the length of the overlay sequence (or the number of bits transmitted through the overlay sequence).

[0141] ● The terminal can set / instruct the overlay sequence length (or the number of bits transmitted through the overlay sequence) according to the number of subcarriers set in the overlay sequence.

[0142] ● If the number of subcarriers set in the overlay sequence by the terminal is greater than the length of the overlay sequence, the terminal detects the overlay sequence in the order of s(0), s(1), ... starting from the lower (or higher) subcarrier, and in the other subcarriers.

[0143] ■ Alt-1: (expecting 0 to be mapped) No detection attempt.

[0144] ■ Alt-2: You can detect the overlay sequence repeatedly in the order s(0), s(1), ...

[0145] ● If the value of the number of subcarriers set in the overlay sequence by the terminal is less than the value of the overlay sequence length, the terminal can detect the overlay sequence starting from the lower (or higher) subcarrier in the order of s(0), s(1), ...

[0146] [Method A2-2] The terminal can detect one s(k) for each subcarrier group.

[0147] ● The number of subcarrier groups (and / or the number of subcarriers within a group) may be defined in advance or may be set / instructed by the terminal through upper layer parameters. The number of subcarrier groups (and / or the number of subcarriers within a group) may be a divisor of the number of subcarriers set / allocated to the overlay sequence.

[0148] ■ For example, the above subcarrier group can be set / determined as 1 RB (= 12 RE) or a specific number of RBs.

[0149] ● The terminal can set / be instructed to set / be instructed to set a subcarrier group for this according to the length of the overlay sequence (or the number of bits transmitted through the overlay sequence).

[0150] ● The terminal can set / instruct the overlay sequence length (or the number of bits transmitted through the overlay sequence) according to the subcarrier group set in the overlay sequence.

[0151] ● If the number of subcarrier groups (and / or subcarriers within a group) set in the overlay sequence of the terminal is greater than the value of the overlay sequence length, the terminal detects the overlay sequence in the order of s(0), s(1), .... starting from the lower (or higher) subcarrier groups (and / or subcarriers within a group), and for other subcarrier groups (and / or subcarriers within a group),

[0152] ■ Alt-1: Do not attempt detection (expecting 0 to be mapped)

[0153] ■ Alt-2: You can detect the overlay sequence in the order of s(0), s(1), ... repeatedly.

[0154] ● If the number of subcarrier groups (and / or the number of subcarriers within a group) set in the overlay sequence of the terminal is smaller than the value of the overlay sequence length, the terminal can detect the overlay sequence starting from the lower (or higher) subcarrier group (and / or subcarrier within a group) in the order of s(0), s(1), ...

[0155] [Method A2-3] The terminal can be set to one of the proposed methods of [Method #A1] and [Method #A2].

[0156] ● Example 1: The proposed methods of the above [Method #A2] can be applied together with the above [Method #A1].

[0157] ■ For example, the terminal detects X s(k) for each OOK symbol, and the s(k) can be detected in units of subcarriers (groups) of the OOK symbol.

[0158] ● Example 2: The terminal can be configured / instructed to use one of the proposed methods of [Method #A1] and [Method #A2] through the upper layer parameters, LP-SS, and / or the preamble part of LP-WUS.

[0159] ■ For example, the terminal can detect X s(k) for each OOK symbol, and can be set / instructed whether the s(k) is to be detected through (valid) samples of the OOK symbol or by subcarrier (group) unit.

[0160] ● Example 3: The terminal can selectively use one of the above [Method #A1] and the above [Method #A2] depending on the OOK modulation method of LP-WUS / LP-SS.

[0161] ■ For example, the terminal can use the above [Method #A2] for LP-WUS / LP-SS modulated with OOK-1 and use the above [Method #A1] for LP-WUS / LP-SS modulated with OOK-4.

[0162] ■ As another example, the terminal may use one of the proposed methods of [Method #A1] and [Method #A2] for LP-WUS / LP-SS modulated with OOK-1, and may be set / instructed through upper layer parameters, LP-SS, and / or preamble part of LP-WUS.

[0163] 2) Transmitter (Entity B):

[0164] [Method #B1] The base station can apply an overlay sequence to each OOK / OFDM unit that constitutes the LP-WUS / LP-SS signal.

[0165] [Method B1-1] The base station can map X s(k) to each OOK symbol or each OFDM symbol.

[0166] ● When X=1:

[0167] ■ Two different sequences, seq(v1) or seq(v2), can be TD overlaid on one OOK / OFDM symbol. The base station can transmit 1 bit by selecting one of the two sequences and TD overlaying it.

[0168] ● If we generalize X to any value,

[0169] ■ One of 2^X different sequences can be TD overlaid on one OOK / OFDM symbol. The base station can transmit X bits by selecting one of these sequences and TD overlaying it.

[0170] ■ If the base station transmits LP-WUS / LP-SS through A OOK / OFDM symbols,

[0171] ◆ Alt-1: The base station can transmit A*X bits through the overlay sequence by transmitting X bits for each OOK / OFDM symbol.

[0172] ◆ Alt-2: The base station can transmit X bits for each OOK / OFDM symbol, and transmit X bits through an overlay sequence by repeating the (same) sequence transmitting the same X bits for each OOK / OFDM symbol.

[0173] ■ Or, if the base station transmits M OOK symbols generated by the OOK-4 modulation method per OFDM symbol,

[0174] ◆ The base station can transmit the same X bits for each OOK symbol using the same sequence for each OOK symbol for the M OOK symbols corresponding to each OFDM symbol section. Therefore, the OOK symbol is transmitted repeatedly. The base station transmits X bits for each OFDM symbol through the overlay sequence. If the base station transmits LP-WUS / LP-SS through A OFDM symbols, the base station can transmit a total of A*X bits.

[0175] ● The above X can be determined in advance. Or, the base station can set / indicate the above X through a higher layer parameter. Or, the base station can set / indicate the above X through the LP-SS signal and / or the preamble part of the LP-WUS.

[0176] [Method B1-2] The base station can map X s(k) to Y OOK symbols or Y OFDM symbols.

[0177] ● When Y=1: Same as [Method B1-1]

[0178] ● If Y is generalized to any value,

[0179] ■ One of 2^X different sequences can be TD overlaid on (consecutive) Y OOK / OFDM symbols. The base station can transmit X bits by selecting one of these sequences and TD overlaying it.

[0180] ■ If the base station transmits LP-WUS / LP-SS through A OOK / OFDM symbols,

[0181] ◆ The base station can transmit floor(A / Y)*X bits or ceil(A / Y)*X bits through the overlay sequence.

[0182] ● The above Y may be determined in advance. Alternatively, the base station may set / indicate the above Y through a higher layer parameter. Alternatively, the base station may set / indicate the above Y through the LP-SS signal and / or the preamble part of the LP-WUS.

[0183] [Method B1-3] The base station can map X s(k) to each sample group.

[0184] ● The above sample group may be a group of some (valid) samples of an OOK / OFDM symbol. For example, if the number of (valid) samples of an OOK / OFDM symbol is N, the sample group may include N / B consecutive (valid) samples. B may be a value such as 1, 2, 4, etc. B is defined in advance, but the base station may set / indicate B through a higher layer parameter.

[0185] ■ Example 1: If the number of (valid) samples of an OOK / OFDM symbol is N=32 (=a(0), ..., a(31)) and the sample group is 32 / 4=8 consecutive samples, the four bits transmitted through the overlay sequence, i.e., {b1, b2, b3, b4}, can be mapped as follows. This allows LP-WUR to operate even at a low sampling rate.

[0186] ◆ {b1*a(0), b1*a(1), ..., b1*a(7), b2*a(0), b2*a(1), ..., b2*a(7), ..., b4*a(0), b4*a(1), ..., b4*a(7)}

[0187] ■ Example 2: Under the same conditions as above, if the sample group is one (valid) sample, it can be mapped as follows.

[0188] ◆ {b1*a(0), b2*a(1), b3*a(2), b4*a(3), ...}

[0189] ■ Example 3: The above sample group may be composed of a certain number of OOK symbol groups.

[0190] ● When X=1:

[0191] ● Two different sequences, i.e., seq(v1) and seq(v2), can be TD-overlaid on one sample group. The base station can transmit one bit per sample group by selecting one of the two sequences and TD-overlaying it.

[0192] ● If we generalize X to any value,

[0193] ■ One of 2^X different sequences can be TD-overlaid on one sample group. The base station selects one of these sequences and TD-overlays it, thereby transmitting X bits for each sample group. The terminal can detect the X bits (transmitted via the overlaid sequence) for each sample group through time domain correlation using the 2^X sequences.

[0194] ■ If the base station transmits LP-WUS / LP-SS through A sample groups,

[0195] ◆ Alt-1: The base station can transmit A*X bits through an overlay sequence for each sample group by transmitting X bits for each sample group.

[0196] ◆ Alt-2: The base station can transmit X bits for each sample group, and transmit X bits through an overlay sequence for each sample group by repeating the (same) sequence that transmits the same X bits for each sample group.

[0197] ■ Or, if the number of sample groups per OOK / OFDM symbol generated by the base station in the OOK-4 modulation method is B,

[0198] ◆ The base station can transmit the same X bits for each M sample group corresponding to each OOK / OFDM symbol section using the same sequence for each sample group. Therefore, the corresponding OOK symbol is transmitted repeatedly. In this case, the base station transmits X bits per OOK / OFDM symbol through the overlay sequence. If the base station transmits LP-WUS / LP-SS through A OOK / OFDM symbols, the base station can transmit a total of A*X bits.

[0199] ◆ The above X and B can be determined in advance. Or, the base station can set / indicate the above X and B through upper layer parameters. Or, the base station can set / indicate the above X and B through the LP-SS signal and / or the preamble part of the LP-WUS.

[0200] [Method B1-4] The base station can map X s(k) to each Y sample group.

[0201] ● When Y=1: Same as [Method B1-3]

[0202] ● If Y is generalized to any value,

[0203] ■ One of 2^X different sequences can be TD-overlaid on a group of (consecutive) Y samples. The base station transmits X bits by selecting one of these sequences and TD-overlaying it. The terminal can detect the X bits transmitted as the overlaid sequence through time domain correlation using the 2^X sequences.

[0204] ■ If the base station transmits LP-WUS / LP-SS through A sample groups,

[0205] ◆ The base station can transmit floor(A / Y)*X bits or ceil(A / Y)*X bits through the overlay sequence.

[0206] ◆ The above Y can be determined in advance. Alternatively, the base station can set / indicate the above Y through a higher layer parameter. Alternatively, the base station can set / indicate the above Y through the LP-SS signal and / or the preamble part of the LP-WUS.

[0207] [Method #B2] The base station can apply an overlay sequence on a subcarrier basis to the LP-WUS / LP-SS signal.

[0208] A base station can map X s(k) per OOK / OFDM symbol. However, the overlay sequence s(k) can be mapped to subcarrier units of an OFDM symbol, not to (valid) samples / sample groups of OOK / OFDM or OOK symbols or OFDM symbol units.

[0209] [Method B2-1] The base station can map one s(k) to each subcarrier.

[0210] ● The base station can set / determine the number of subcarriers for this according to the length of the overlay sequence (or the number of bits transmitted through the overlay sequence).

[0211] ● The base station can set / determine the overlay sequence length (or the number of bits transmitted through the overlay sequence) according to the number of subcarriers set in the overlay sequence.

[0212] ● If the base station sets the number of subcarriers set in the overlay sequence to be greater than the value of the overlay sequence length, the base station maps the overlay sequence in the order of s(0), s(1), ... starting from the lower (or higher) subcarriers, and for the other subcarriers

[0213] ■ Alt-1: Can be mapped to 0

[0214] ■ Alt-2: You can map the overlay sequence repeatedly in the order s(0), s(1), ...

[0215] ● If the base station sets the number of subcarriers set in the overlay sequence to be smaller than the value of the overlay sequence length, the base station maps the overlay sequence starting from the lower (or higher) subcarriers in the order of s(0), s(1), ..., and may not use the unmapped s(k).

[0216] [Method B2-2] The base station can map one s(k) to each subcarrier group.

[0217] ● The number of subcarrier groups (and / or the number of subcarriers within a group) may be defined in advance or may be set / indicated by the base station through upper layer parameters. The number of subcarrier groups (and / or the number of subcarriers within a group) may be a multiple of the number of subcarriers set / allocated to the overlay sequence.

[0218] ■ For example, the above subcarrier group can be set / determined as 1 RB (= 12 RE) or a specific number of RBs.

[0219] ● The base station can set / determine the subcarrier group for this according to the overlay sequence length (or the number of bits transmitted through the overlay sequence).

[0220] ● The base station can set / determine the overlay sequence length (or the number of bits transmitted through the overlay sequence) according to the subcarrier group set in the overlay sequence.

[0221] ● If the number of subcarrier groups (and / or subcarriers within a group) set by the base station in the overlay sequence is greater than the value of the overlay sequence length, the base station maps the subcarrier groups (and / or subcarriers within a group) in the order of s(0), s(1), ... from the lower (or higher) subcarrier groups (and / or subcarriers within a group), and the other subcarrier groups (and / or subcarriers within a group) are mapped in the order of s(0), s(1), ...

[0222] ■ Alt-1: Can be mapped to 0.

[0223] ■ Alt-2: You can map the overlay sequence repeatedly in the order s(0), s(1), ...

[0224] ● If the number of subcarrier groups (and / or subcarriers within a group) set by the base station in the overlay sequence is less than the value of the overlay sequence length, the overlay sequence is mapped starting from the lower (or higher) subcarrier groups (and / or subcarriers within a group) in the order of s(0), s(1), ..., and unmapped s(k) may not be used.

[0225] [Method B2-3] The base station can set one of the proposed methods of [Method #B1] and [Method #B2].

[0226] ● Example 1: The proposed methods of the above [Method #B2] can be applied together with the above [Method #B1].

[0227] For example, the base station can map X s(k) to each OOK symbol, and map the s(k) to subcarriers (groups) of the OOK symbol.

[0228] ● Example 2: The base station can set one of the proposed methods of [Method #B1] and [Method #B2] through the upper layer parameters, LP-SS, and / or the preamble part of LP-WUS.

[0229] ■ For example, the base station can map X s(k) to each OOK symbol and set / indicate whether the s(k) should be mapped to (valid) samples of the OOK symbol or to subcarrier (group) units.

[0230] ● Example 3: The base station can selectively use one of the above [Method #B1] and the above [Method #B2] depending on the OOK modulation method of LP-WUS / LP-SS.

[0231] ■ For example, the base station can use the above [Method #B2] to perform FD overlay for LP-WUS / LP-SS modulated with OOK-1, and use the above [Method #B1] to perform TD overlay for LP-WUS / LP-SS modulated with OOK-4.

[0232] ■ As another example, the base station may use one of the proposed methods of [Method #B1] and [Method #B2] for LP-WUS / LP-SS modulated with OOK-1, and may set / indicate this through upper layer parameters, LP-SS, and / or preamble part of LP-WUS.

[0233] Meanwhile, the present invention is not limited to the transmission and reception of uplink and / or downlink signals. For example, the present invention can also be used in direct communication between terminals. Furthermore, the base station in the present invention may include not only a base station but also a relay node. For example, the base station operations in the present invention may be performed by the base station, but may also be performed by a relay node.

[0234] A-IoT (Ambient Internet of Things)

[0235] A-IoT could be a new type / segment of devices that operate solely on energy harvested from the surrounding environment. For example, A-IoT could refer to a new type of Internet of Things device that is powered by various energy sources harvested from the surrounding environment, such as radio waves, light, motion, and heat.

[0236] For example, active signal generation and / or backscattering may be among the communication technologies considered to achieve low-power operation of A-IoT devices. For example, backscattering is a technique widely used in radio frequency identification (RFID), which allows devices to communicate with a network by reflecting incident waves after modulating them with information to be transmitted. For example, the device may be powered by the incident RF signal or by stored energy.

[0237] For example, IoT devices can be classified into various device types, such as passive, semi-passive, and active, depending on how they store energy and generate transmission signals. For example, a passive device does not have an energy storage device (e.g., a capacitor) and can communicate based on backscatter communication technology. For example, a semi-passive device has an energy storage device and can communicate using backscatter communication technology with the help of the energy storage device. For example, an active device has an energy storage device and can actively generate signals using active RF components and the stored energy to communicate. For example, in the present disclosure, the following three types of IoT devices can be considered. For example, device A can be a device without energy storage and without independent signal generation (e.g., a device that supports backscatter transmission). For example, device B can be a device with energy storage and without independent signal generation (e.g., a device that supports backscatter transmission). In this case, for example, the use of stored energy may involve amplification of the reflected signal. For example, device C may be a device with energy storage and independent signal generation (e.g., a device with an active RF component for transmission).

[0238] For example, the following basic topologies may be considered to support A-IoT devices in indoor and outdoor scenarios. For example, the basic topologies may include direct connections between base stations and A-IoT devices, connections between base stations and intermediate nodes and A-IoT devices, connection support by auxiliary nodes, and / or connections between terminals and A-IoT devices. The basic topologies proposed in this disclosure are merely examples, and the proposals in this disclosure may be extended / applied to other topologies.

[0239] A-IoT devices can be categorized into two types: Type 1 devices, which have a maximum power consumption of approximately 1 uW, are capable of storing energy, do not have an amplification function, and can transmit by backscattering a carrier wave (CW) provided from an external source (e.g., a reader such as a base station or a terminal, or a separate node). Type 2 devices, for example, have a maximum power consumption of approximately several hundred uW, are capable of storing energy, are capable of amplification, and can transmit by backscattering a carrier wave (CW) provided from an external source (e.g., a reader such as a base station or a terminal, or a separate node) or by using a signal generated internally.

[0240] For example, in addition to the above-described classification methods, the type / class of A-IoT devices can be distinguished based on parameters associated with device characteristics (e.g., presence / capacity of energy storage, energy / power consumption, presence / capacity of amplification, presence / capacity of BPF (band-pass filter), supported DL / UL transmission method(s), etc.) or a combination of parameters. Here, for example, BPF capability can be distinguished by 3-dB bandwidth of supported BPF, sharpness, etc., and UL transmission methods can be distinguished by, for example, backscatter UL transmission, UL transmission by internal signal generation, etc.

[0241] In addition, the type / class of A-IoT devices can be subdivided based on parameters associated with the device characteristics (e.g., presence / capacity of energy storage, level of energy / power consumption, presence / capacity of amplification, presence / capacity of band-pass filter (BPF), supported DL / UL transmission method(s), etc.) or a combination of parameters. For example, the above-described Type 2 device can be classified into Type 2a if it performs transmission by backscattering a carrier wave (CW) provided from the outside (e.g., a reader such as a base station or terminal or a separate node), and Type 2b if it performs transmission using a signal generated internally by itself. In this case, Type 2a and 2b can be the same in that they have a maximum power consumption of approximately several hundred microwatts, are capable of energy storage, and have an amplification function.

[0242] LP-WUS can be transmitted and received between A-IoT devices. Specifically, the waveform transmitted from the reader to the A-IoT device may correspond to the waveform proposed through the embodiments of this specification. The A-IoT device may include only LR without MR. Therefore, when the A-IoT device receives LP-WUS, it can perform operations such as initial connection or data transmission / reception through LR instead of triggering (or activating) MR.

[0243] It is clear that the examples of the proposed methods described above can also be considered as a type of proposed methods, as they can be included as one of the implementation methods of the present invention. In addition, the proposed methods described above can be implemented independently, but can also be implemented in the form of a combination (or merge) of some of the proposed methods. Information on whether the proposed methods are applicable (or information on the rules of the proposed methods) can be defined by a rule so that the base station notifies the terminal or the transmitting terminal notifies the receiving terminal through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0244] Implementation example

[0245] Figure 9 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0246] Referring to FIG. 9, a signal transmission and reception method according to an embodiment of the present invention may be performed by a terminal and may include a step (S501) of receiving a signal through a first receiver, and a step (S503) of performing a specific operation based on the reception of the signal.

[0247] The specific action may be an action by which the terminal triggers a second receiver. Alternatively, if the terminal is an A-IoT device, the action may be an action by which the terminal transmits a response signal based on the signal.

[0248] The above signal may be an LP-SS and / or LP-WUS as described in the present specification. Even if expressed by another name, if the signal is a signal for triggering the operation of another receiver based on the signal being received by a specific receiver or a signal received by an A-IoT device, it may correspond to the LP-WUS of the present specification. In addition, even if expressed by another name, if the signal is a signal for synchronizing the LP-WUS, it may correspond to the LP-WUS of the present specification.

[0249] The first receiver corresponds to a separate receiver for receiving LP-WUS (i.e., LP-WUR), and the second receiver corresponds to a main receiver (i.e., MR). The specific names may be changed from LP-WUR and MR, but the first receiver is designed to consume relatively less power than the second receiver. The main receiver may be a receiver of an existing NR system, and even if it is a receiver of a communication system other than an NR system, if it is a receiver that is triggered based on the reception of a signal from another receiver that consumes relatively less power, it may correspond to the main receiver.

[0250] However, in the case of an A-IoT device, only the first receiver among the first and second receivers may be included.

[0251] In addition to the basic operations of Figure 9, the operations described for entities A and B can be combined.

[0252] Figure 10 is a flowchart that further concretizes a signal transmission and reception method according to an embodiment of the present invention.

[0253] Referring to FIG. 10, a signal transmission and reception method from a terminal perspective according to an embodiment of the present invention may be configured to include a step of receiving an LP-WUS through a first receiver (S1203), and a step of operating a second receiver that has been stopped based on the reception of the LP-WUS (S1204). A signal transmission and reception method from a base station perspective according to an embodiment of the present invention may be configured to include a step of determining an overlay sequence for the LP-WUS (S1201), and a step of transmitting the LP-WUS based on the overlay sequence (S1202).

[0254] In addition to the actions of Figure 10, the actions described for entities A and B can be combined.

[0255] For example, the overlay sequence for LP-WUS can be determined based on Method #A1, Method #A2, Method #B1 and / or Method #B2. The setting thereof can be performed based on Method A2-3 and / or Method B2-3.

[0256] Referring to Method A2-3 and / or Method B2-3, an overlay sequence may be used in a specific unit in the time domain (e.g., symbols) or frequency domain (e.g., subcarriers) of the LP-WUS. The specific unit may be determined based on the upper layer signal, the LP-SS, and / or the preamble part of the LP-WUS.

[0257] Referring to Method A1-1 and / or Method B1-1, one of 2^X s(k) can be detected for each symbol. 2^X is the number of overlay sequence candidates that can be detected, and X is the number of bits that can be expressed through the overlay sequence. The length of one overlay sequence can correspond to the length of all samples included in one symbol.

[0258] Referring to Method A1-2 and / or Method B1-2, one of 2^X s(k) can be detected for each of a plurality of Y symbols. 2^X is the number of overlay sequence candidates that can be detected, and X is the number of bits that can be expressed through the overlay sequence. The length of one overlay sequence can correspond to the length of all samples included in the plurality of Y symbols.

[0259] Referring to Method A1-3 and / or Method B1-3, one of 2^X s(k) can be detected for each sample group. 2^X is the number of overlaid sequence candidates that can be detected, and X is the number of bits that can be expressed through the overlaid sequence. Since a sample group is composed of some of the samples included in one symbol, the length of one overlaid sequence can correspond to the length of some of the samples included in one symbol.

[0260] Referring to Method A1-3 and / or Method B1-3, one of 2^X s(k) can be detected for each of a plurality of sample groups. 2^X is the number of overlaid sequence candidates that can be detected, and X is the number of bits that can be expressed through the overlaid sequence. Since a sample group is composed of some of the samples included in one symbol, the length of one overlaid sequence can correspond to a multiple of the length of some of the samples that make up the sample group among the samples included in one symbol.

[0261] The symbol for which the overlay sequence is used can be an OOK symbol or an OFDM symbol.

[0262] Examples of communication systems to which the present invention is applied

[0263] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present invention disclosed in this document may be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0264] Hereinafter, more specific examples will be provided with reference to the drawings. In the drawings / descriptions below, the same drawing reference numerals may represent identical or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise described.

[0265] Figure 11 illustrates a communication system (1) applied to the present invention.

[0266] Referring to FIG. 11, a communication system (1) applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and can be implemented in the form of HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0267] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0268] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or, D2D communication), and communication between base stations (150c) (e.g., relay, IAB (Integrated Access Backhaul). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes can be performed based on various proposals of the present invention.

[0269] Examples of wireless devices to which the present invention is applied

[0270] Figure 12 illustrates a wireless device applicable to the present invention.

[0271] Referring to FIG. 12, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 11.

[0272] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0273] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0274] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0275] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0276] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0277] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0278] Examples of wireless devices to which the present invention is applied

[0279] Figure 13 illustrates another example of a wireless device applicable to the present invention. The wireless device may be implemented in various forms depending on the use case / service (see Figure 11).

[0280] Referring to FIG. 13, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 12 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and an additional element (140). The communication unit may include a communication circuit (112) and a transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 12. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 12. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0281] The additional element (140) may be configured in various ways depending on the type of the wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 11, 100a), a vehicle (Fig. 11, 100b-1, 100b-2), an XR device (Fig. 11, 100c), a portable device (Fig. 11, 100d), a home appliance (Fig. 11, 100e), an IoT device (Fig. 11, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 11, 400), a base station (Fig. 11, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0282] In FIG. 13, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of one or more processor sets. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0283] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0284] Figure 14 illustrates a vehicle or autonomous vehicle applicable to the present invention. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned or unmanned aerial vehicle (AV), a ship, or the like.

[0285] Referring to FIG. 14, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 of FIG. 8, respectively.

[0286] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit (120) can control elements of the vehicle or autonomous vehicle (100) to perform various operations. The control unit (120) can include an ECU (Electronic Control Unit). The drive unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The drive unit (140a) can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit (140b) supplies power to the vehicle or autonomous vehicle (100) and can include a wired / wireless charging circuit, a battery, etc. The sensor unit (140c) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (140c) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit (140d) may implement a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0287] For example, the communication unit (110) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (140d) can generate an autonomous driving route and driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or autonomous vehicle (100) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit (140c) can acquire vehicle status and surrounding environment information. The autonomous driving unit (140d) can update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to the external server. External servers can predict traffic information data in advance using AI technology or other technologies based on information collected from vehicles or autonomous vehicles, and provide the predicted traffic information data to the vehicles or autonomous vehicles.

[0288] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the scope of the invention. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0289] As described above, the present invention can be applied to various wireless communication systems.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal that has been stopped based on reception of the LP-WUS; For the symbols of the above LP-WUS, one overlaid sequence is used per specific unit, The above specific unit is determined based on a specific signal received from the base station. method.

2. In paragraph 1, One overlay sequence is used per multiple symbols of all or some of the above symbols, method.

3. In paragraph 1, One overlay sequence is used per sample group of the above LP-WUS, and the sample group is composed of some of the samples included in one of the symbols, method.

4. In paragraph 1, One overlay sequence is used per multiple sample groups of the above LP-WUS, and one sample group of the multiple sample groups is composed of some of the samples included in one of the symbols, method.

5. In paragraph 1, The above specific signal is a higher layer signal, method.

6. In paragraph 1, The above specific signal is a LP-SS (Low Power-Synchronization Signal). method.

7. In paragraph 1, The above LP-WUS includes a preamble part and a message part, The specific signal is the preamble part, and the overlay sequence is mapped to one or more symbols of the message part. method.

8. In paragraph 1, Based on the number of candidates for the above one overlaid sequence, the number of bits that can be expressed by the above one overlaid sequence is determined. method.

9. In paragraph 1, The above symbol is an OOK (on off keying) symbol. method.

10. In a terminal operating in a wireless communication system, First receiver and second receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal that has been stopped based on reception of the LP-WUS; For the symbols of the above LP-WUS, one overlaid sequence is used per specific unit, The above specific unit is determined based on a specific signal received from the base station. Terminal.

11. In a device for a terminal, at least one processor; and At least one computer memory operably connected to said at least one processor and configured to, when executed, cause said at least one processor to perform operations, said operations comprising: A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal that has been stopped based on reception of the LP-WUS; For the symbols of the above LP-WUS, one overlaid sequence is used per specific unit, The above specific unit is determined based on a specific signal received from the base station. device.

12. A computer-readable non-volatile storage medium comprising at least one computer program that causes a terminal including at least one processor to perform an operation, the operation comprising: A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal that has been stopped based on reception of the LP-WUS; For the symbols of the above LP-WUS, one overlaid sequence is used per specific unit, The above specific unit is determined based on a specific signal received from the base station. Storage media.

13. In a method performed by a base station in a wireless communication system, A step of determining an overlaid sequence for a LP-WUS (Low Power-Wake Up Signal) for a first receiver of the terminal; and A step of transmitting the LP-WUS based on the above overlay sequence; For the symbols of the above LP-WUS, one overlaid sequence is used per specific unit, The above specific unit is determined based on a specific signal transmitted from a base station. method.

14. In a base station operating in a wireless communication system, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of determining an overlaid sequence for a LP-WUS (Low Power-Wake Up Signal) for a first receiver of the terminal; and A step of transmitting the LP-WUS based on the above overlay sequence; For the symbols of the above LP-WUS, one overlaid sequence is used per specific unit, The above specific unit is determined based on a specific signal transmitted from a base station. Base station.

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