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

Abstract

In a method and a device for transmitting and receiving a signal in a wireless communication system, disclosed in the present specification, when a base station and a terminal transmit and receive an LP-WUS, an overlaid sequence including the same information as information included in a symbol of the LP-WUS is used.

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, which has been stopped, based on reception of the LP-WUS; wherein, for N symbols of the LP-WUS, one overlaid sequence is used for each symbol, and the same information as information included in the N symbols is obtained through the overlaid sequence(s) used for K symbol(s) among the N symbols.

[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 modulation method; wherein, for N symbols of the LP-WUS, one overlaid sequence is used for each symbol, and the overlaid sequence(s) used for K symbol(s) among the N symbols are configured to include the same information as information included in the N symbols.

[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 following expressions may be used in this specification:

[0076] ● If the overlay sequence is assumed to be a length-K sequence (i.e., {s(1), s(K)}), s(k) refers to the kth element of the sequence or can refer to 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), s(K)}. These 2^K different sequences are expressed as seq(v), v=1, s(k),2^K. In this case, 2^K is 2 K , 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), s(K)}. These 2^K different sequences can also be expressed as seq(v), v=1, s(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] ● 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.

[0085] ● 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 single OFDM symbol.

[0086] ● 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.

[0087] ■ 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.

[0088] ■ 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).

[0089] ● 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.

[0090] ■ For example, when the above sequence is FD overlaid, each element of the sequence may be multiplied by one or more subcarriers.

[0091] ■ 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)}.

[0092] 1) Receiver (Entity A)

[0093] [Method #A1] The terminal can transmit / receive cell information (partially) through an overlay sequence.

[0094] The (cell) coverage of an LP-WUS signal may differ from that of a conventional signal / channel. LP-WUR can be designed with a low-power consumption structure, and thus power-consuming PLLs, local oscillators, LNAs, and FFT modules may not be used. Therefore, the (cell) coverage of LP-WUS may be smaller than that of MR. When an OOK-based waveform with an overlaid OFDM sequence is used as an LP-WUS signal, LP-WUR can be divided into an LP-WUR type that can decode the overlaid sequence and an LP-WUR type that cannot. These two LP-WUR types can be expressed as follows.

[0095] ● LP-WUR Type 1: LP-WUR that cannot decode overlay sequences

[0096] ● LP-WUR Type 2: LP-WUR capable of decoding overlay sequences

[0097] LP-WUR Type 1 can detect information transmitted through LP-WUS by performing energy detection or envelope detection of OOK signals, i.e., ON and OFF signals. LP-WUR Type 2 can detect information transmitted through LP-WUS by receiving an overlay sequence. In particular, among LP-WUR Type 2, an LP-WUR capable of performing a time domain correlation operation can receive / detect an LP-WUS in which an overlay sequence is TD overlaid, and an LP-WUR capable of performing an FFT and frequency domain correlation operation can receive / detect an LP-WUS in which an overlay sequence is FD overlaid. Since the OOK signal can be detected using some of the I / Q paths (in-phase and quadrature paths) for time / frequency domain correlation depending on the terminal implementation, LP-WUR Type 2 may also perform the operation of LP-WUR Type 1 depending on the base station settings or terminal implementation method.

[0098] The cell coverage of LP-WUR Type 1 and LP-WUR Type 2 can be different. Typically, the coverage over which an overlay sequence can be received by LP-WUR Type 2 can be greater than that over which an OOK signal can be received by LP-WUR Type 1. Accordingly, at the cell edge, LP-WUR Type 1 can no longer receive LP-WUS (i.e., OOK signal) and wakes up the MR. Meanwhile, LP-WUR Type 2 can still receive and decode an overlay sequence at the cell edge.

[0099] [Method A1-1] The terminal can detect (some) information of the cell in which the corresponding LP-WUS / LP-SS is transmitted through reception of an overlay sequence.

[0100] ● The terminal may be configured (or may expect) that the overlay sequence of the LP-WUS / LP-SS uses the same sequence as the PSS or SSS that constitutes the SSB of the cell in which the LP-WUS / LP-SS is transmitted.

[0101] ■ The sequence identical to the above PSS / SSS refers to a 127-length sequence for generating PSS / SSS, which is defined in the 3GPP TS 38.211 document. For example, the defined PSS is generated using one of three different sequences, i.e., x0(n), x1(n), and x2(n).

[0102] ◆ x0(n) = x(n)

[0103] ◆ x1(n) = x(n+43*PCI_2 mod 127)

[0104] ◆ x2(n) = x(n+86*PCI_2 mod 127)

[0105] ◆ At this time, PCI_2 is a part of the physical cell ID that can have one of the values ​​{0,1,2}. n is 0, 쪋, 126. x(n) is an m-sequence of length 127 generated by the relationship between the initial value [x(6) x(5) x(4) x(3) x(2) x(1)]=[1 1 1 0 1 1 0] and x(n) = x(n-7) + x(n-3) mod 2.

[0106] ■ The terminal can find one of x0(n), x1(n), x2(n) by receiving an overlay sequence. Or (similarly) the terminal can find one of 336 (127-length) sequences used for SSS generation by receiving an overlay sequence. In this way, the terminal can detect a part of the physical cell ID of the cell where the LP-WUS / LP-SS is transmitted.

[0107] ■ Alternatively, the terminal can find a 127*2 length sequence that connects one of the sequences corresponding to the PSS and one of the sequences corresponding to the SSS by receiving an overlay sequence. Through this method, the terminal can detect the physical cell ID of the cell where the LP-WUS / LP-SS is transmitted.

[0108] The 127 or 127*2 length overlay sequence of the above method can be transmitted over multiple OOK / OFDM symbols (i.e., TD overlaying) or over one OOK / OFDM symbol (i.e., FD overlaying).

[0109] [Method A1-2] The terminal may be configured or expect that an orthogonal overlay sequence is used for each cell in which LP-WUS / LP-SS is transmitted.

[0110] ● When a base station transmits LP-WUS through N OOK / OFDM symbols, if the value obtained by modulo-operating the physical cell ID of the cell transmitting the LP-WUS / LP-SS by N is K, the base station can use overlay sequence #1 for the Kth symbol among the N symbols, and use overlay sequence #2 for the remaining N-1 symbols. The terminal can detect the OOK / OFDM symbol in which overlay sequence #1 is transmitted by correlating the received overlay sequence with sequence #1 / sequence #2 (for example), and thereby find the cell in which the LP-WUS / LP-SS is transmitted. The sequence #1 and sequence #2 above mean different sequences (in terms of sequence type, cyclic shift, power, etc.).

[0111] ● When a base station transmits an LP-WUS / LP-SS through N subcarriers (i.e., REs) or subcarrier groups (e.g., RBs), and the value obtained by modulating the physical cell ID of the cell where the LP-WUS / LP-SS is transmitted is K, the base station may use overlaid sequence #1 for the Kth subcarrier / subcarrier group among N, and use overlaid sequence #2 for the remaining N-1 subcarriers / subcarrier groups. The terminal may attempt decoding using sequence #1 / sequence #2 for the N subcarriers / subcarrier groups to find the subcarrier / subcarrier group where the overlaid sequence #1 is transmitted, and thereby find the cell where the LP-WUS / LP-SS is transmitted. The sequence #1 and sequence #2 indicate different sequences (in terms of sequence type, cyclic shift, power, etc.).

[0112] ● When the base station transmits LP-WUS / LP-SS through N OOK / OFDM symbols, the base station can transmit (part of) the physical cell ID by applying a specific spreading code to the overlay sequence. In this case, the terminal can find (part of) the physical cell where the LP-WUS / LP-SS was transmitted by attempting to dispread the N OOK / OFDM symbols using the spreading code.

[0113] [Method #A2] The terminal can set the type of information to be transmitted through the overlay sequence and receive different information accordingly.

[0114] A terminal can receive LP-WUS content by receiving consecutive OOK symbols. At this time, the LP-WUS content can be a terminal ID, a terminal group ID, an SI change / update instruction, disaster information such as ETWS / CMAS, cell information, etc. Since the most important purpose of introducing LP-WUS is to wake up the MR of a terminal or a terminal group, the terminal ID or the terminal group ID can be the primary content of LP-WUS, and other content can be secondary content. However, the distinction between primary content / secondary content is not necessarily limited to this. Meanwhile, a terminal can receive an overlay sequence together with the corresponding OOK symbol, and can also receive the LP-WUS content through this. A terminal can also receive an overlay sequence that uses a (predefined) known sequence. In this case, we will indicate the reception of no content in the following proposal.

[0115] [Method A2-1] The terminal can receive / detect LP-WUS content using one of the following methods.

[0116] ● Alt-1: The terminal can detect the primary content by receiving the OOK symbol and can detect the primary content by receiving the overlay sequence.

[0117] ● Alt-2: The terminal can detect the primary content by receiving the OOK symbol and detect the non-content by receiving the overlay sequence.

[0118] ● Alt-3: The terminal can detect the primary content by receiving the OOK symbol and can detect the secondary content by receiving the overlay sequence.

[0119] ● Alt-4: The terminal can detect the non-content by receiving the OOK symbol and detect the primary content by receiving the overlay sequence.

[0120] ● Alt-5: The terminal can detect the secondary content by receiving the OOK symbol and can detect the primary content by receiving the overlay sequence.

[0121] ■ For example, a simple wake-up instruction (eg, 1 bit) can be detected by receiving an OOK symbol, and a terminal ID or terminal group ID can be detected by receiving an overlay sequence.

[0122] ■ For example, a simple wake-up instruction (eg, 1 bit) can be detected by receiving an OOK symbol, and cell information, ETWS / CMAS, and SI change information can be detected by receiving an overlay sequence.

[0123] ● Alt-6: The terminal can detect a part of the secondary content by receiving an OOK symbol, and can detect another part of the secondary content by receiving an overlay sequence.

[0124] ■ For example, the terminal group ID can be detected by receiving the OOK symbol, and the terminal identifier (or terminal ID) within the terminal group can be detected by receiving the overlay sequence.

[0125] Specifically, the terminal can expect LP-WUS content to be transmitted using one of the above Alt-1 / 2 / 3 methods in RRC idle mode / RRC inactive mode. In addition, the terminal can expect LP-WUS content to be transmitted using one of the above Alt-1 to Alt-6 methods in RRC connected mode.

[0126] Specifically, the terminal can detect specific LP-WUS content by receiving an OOK symbol in RRC idle mode / RRC inactive mode, and can detect (another) specific LP-WUS content by receiving an overlay sequence in RRC connected mode. For example, the terminal can detect DRX on / off information by receiving an OOK symbol in idle mode / inactive mode, and can detect a flag that instructs / triggers PDCCH monitoring by receiving an overlay sequence in connected mode.

[0127] The terminal can receive information about which LP-WUS content it can detect through upper layer parameters by receiving OOK symbols and overlay sequences, respectively. Alternatively, the terminal can set / receive this information by receiving the preamble part of LP-SS or LP-WUS.

[0128] [Method #A3] The terminal can be configured to transmit / use the overlay sequence according to the number of OOK / OFDM symbols required for overlay sequence transmission. In addition, the terminal's behavior after receiving LP-WUS according to this can be specified.

[0129] [Method A3-1] The terminal can obtain the same content as the LP-WUS / LP-SS content that can be received through the OOK symbol by receiving the overlay sequence. The number of bits that can be transmitted through the overlay sequence may vary depending on the number of (valid) samples of OOK / OFDM. Alternatively, when the overlay sequence is transmitted through FD overlaying, the terminal can receive LP-WUS / LP-SS content of multiple bits through a small number (e.g., 1) of OOK / OFDM symbols. In this case, the base station can transmit the LP-WUS content in some OOK / OFDM symbols, and not transmit the LP-WUS content in other symbols, or can repeatedly transmit the LP-WUS content. In the following proposal, we will denote as N the number of OOK / OFDM symbols required by a base station to transmit a specific LP-WUS / LP-SS content using only OOK modulation, and as K the number of OOK / OFDM symbols required to transmit the corresponding LP-WUS / LP-SS content using only overlay sequences.

[0130] ● Example 1: If K=N, the terminal can decode the overlay sequence using the TD overlay or FD overlay sequence for the N received OOK / OFDM symbols.

[0131] ● Example 2: If K=1, the terminal can decode all received OOK / OFDM symbols using the overlay sequence used for one (e.g., the first) OOK / OFDM symbol.

[0132] ● Example 3: If N is twice as large as K, the terminal can decode N OOK / OFDM symbols in units of K symbols using the overlay sequence used for half of the OOK / OFDM symbols. In general, if N is X times as large as K, the terminal can decode the received N OOK / OFDM symbols K times using the overlay sequence used for K OOK / OFDM symbols.

[0133] [Method A3-2] The terminal can obtain LP-WUS content by decoding the overlay sequence in some received OOK / OFDM symbols and perform ED (Energy detection or Envelop detection) on other received symbols. For example, a terminal including LP-WUR Type 2 can receive information about the OOK / OFDM symbol in which the overlay sequence is transmitted through a higher layer parameter, or can be set / instructed through the LP-SS or preamble part. The terminal can perform sequence decoding on the corresponding symbol and ED on the other symbols.

[0134] ● Example 1: If K = 1, the terminal can detect LP-WUS content by performing overlaid sequence decoding on one (e.g., the first) symbol among the received OOK / OFDM symbols, and perform ED on the remaining N-1 symbols.

[0135] ● Example 2: If N is twice as large as K, the terminal can detect LP-WUS content by performing overlaid sequence decoding on half of the received OOK / OFDM symbols (from the front), and perform ED on the remaining half of the symbols (from the back). In general, if N is X times as large as K, the terminal can detect LP-WUS content by performing overlaid sequence decoding on K symbols (from the front) among the received OOK / OFDM symbols, and perform ED on the remaining NK symbols (from the back).

[0136] ● Example 3: If K = 1, the terminal can detect LP-WUS content using one (e.g., the first) symbol among the received OOK / OFDM symbols and, if instructed to wake up the MR through this (e.g., when detecting its own terminal ID or the ID of the terminal group to which it belongs through LP-WUS), ignore the remaining N-1 symbols and wake up the MR immediately.

[0137] ● Example 4: If N is twice K, the terminal can ignore the remaining half of symbols and immediately wake up the MR if it is instructed to detect LP-WUS content using half of the symbols (from the front) among the received OOK / OFDM symbols and wake up the MR through these (for example, when detecting its own terminal ID or the ID of the terminal group to which it belongs through LP-WUS). In general, if N is X times K, the terminal can ignore the remaining half of symbols and immediately wake up the MR if it is instructed to detect LP-WUS content using K symbols (from the front) among the received OOK / OFDM symbols and wake up the MR through these (for example, when detecting its own terminal ID or the ID of the terminal group to which it belongs through LP-WUS).

[0138] The method by which N, K or the terminal decode the overlay sequence, known sequence, etc. mentioned in the above proposal may be predetermined or set / indicated by the base station as a higher layer parameter. Alternatively, it may be set / indicated through the preamble part of LP-SS or LP-WUS.

[0139] 2) Transmitter (Entity B)

[0140] [Method #B1] The base station can transmit / forward (part of) cell information through an overlay sequence.

[0141] The (cell) coverage of an LP-WUS signal may differ from that of a conventional signal / channel. LP-WUR can be designed with a low-power consumption structure, and thus power-consuming PLLs, local oscillators, LNAs, and FFT modules may not be used. Therefore, the (cell) coverage of LP-WUS may be smaller than that of MR. When an OOK-based waveform with an overlaid OFDM sequence is used as an LP-WUS signal, LP-WUR can be divided into an LP-WUR type that can decode the overlaid sequence and an LP-WUR type that cannot. These two LP-WUR types can be expressed as follows.

[0142] ● LP-WUR Type 1: LP-WUR that cannot decode overlay sequences

[0143] ● LP-WUR Type 2: LP-WUR capable of decoding overlay sequences

[0144] LP-WUR Type 1 can detect information transmitted through LP-WUS by performing energy detection or envelope detection of OOK signals, i.e., ON and OFF signals. LP-WUR Type 2 can detect information transmitted through LP-WUS by receiving an overlay sequence. In particular, among LP-WUR Type 2, an LP-WUR capable of performing a time domain correlation operation can receive / detect an LP-WUS in which an overlay sequence is TD overlaid, and an LP-WUR capable of performing an FFT and frequency domain correlation operation can receive / detect an LP-WUS in which an overlay sequence is FD overlaid. Since the OOK signal can be detected using some of the I / Q paths (in-phase and quadrature paths) for time / frequency domain correlation depending on the terminal implementation, LP-WUR Type 2 may also perform the operation of LP-WUR Type 1 depending on the base station settings or terminal implementation method.

[0145] The cell coverage of LP-WUR Type 1 and LP-WUR Type 2 can be different. Typically, the coverage over which an overlay sequence can be received by LP-WUR Type 2 can be greater than that over which an OOK signal can be received by LP-WUR Type 1. Accordingly, at the cell edge, LP-WUR Type 1 can no longer receive LP-WUS (i.e., OOK signal) and wakes up the MR. Meanwhile, LP-WUR Type 2 can still receive and decode an overlay sequence at the cell edge.

[0146] [Method B1-1] The base station can inform (some) information of the cell to which the LP-WUS / LP-SS is transmitted through an overlay sequence.

[0147] ● The base station can use the same sequence as the PSS or SSS that constitutes the SSB of the cell where LP-WUS / LP-SS is transmitted as the overlay sequence.

[0148] ■ The sequence identical to the above PSS / SSS refers to a 127-length sequence for generating PSS / SSS, which is defined in the 3GPP TS 38.211 document. For example, the defined PSS is generated using one of three different sequences, i.e., x0(n), x1(n), and x2(n).

[0149] ◆ x0(n) = x(n)

[0150] ◆ x1(n) = x(n+43*PCI_2 mod 127)

[0151] ◆ x2(n) = x(n+86*PCI_2 mod 127)

[0152] ◆ At this time, PCI_2 is a part of the physical cell ID that can have one of the values ​​{0,1,2}. n is 0, 쪋, 126. x(n) is an m-sequence of length 127 generated by the relationship between the initial value [x(6) x(5) x(4) x(3) x(2) x(1)]=[1 1 1 0 1 1 0] and x(n) = x(n-7) + x(n-3) mod 2.

[0153] ■ The base station can use one of the above x0(n), x1(n), x2(n) as an overlay sequence. Or (similarly) the base station can use one of the 336 (127-length) sequences used for SSS generation as an overlay sequence. In this way, the base station can inform the terminal of part of the physical cell ID of the cell where the LP-WUS / LP-SS is transmitted.

[0154] ■ Alternatively, the base station can use a 127*2 sequence that concatenates one of the sequences corresponding to the PSS and one of the sequences corresponding to the SSS as an overlay sequence. Through this method, the base station can inform the terminal of the physical cell ID of the cell where the LP-WUS / LP-SS is transmitted.

[0155] The 127 or 127*2 length overlay sequence of the above method can be transmitted over multiple OOK / OFDM symbols (i.e., TD overlaying) or over one OOK / OFDM symbol (i.e., FD overlaying).

[0156] [Method B1-2] The base station can select / transmit the overlay sequence to be orthogonal to each cell where LP-WUS is transmitted.

[0157] ● When a base station transmits LP-WUS through N OOK / OFDM symbols, if the value obtained by modulo calculating the physical cell ID of the cell transmitting the LP-WUS / LP-SS by N is K, the base station can use overlay sequence #1 for the Kth symbol among the N symbols, and use overlay sequence #2 for the remaining N-1 symbols. The above sequences #1 and #2 mean different sequences (in terms of sequence type, cyclic shift, power, etc.).

[0158] ● When a base station transmits an LP-WUS / LP-SS through N subcarriers (i.e., REs) or subcarrier groups (e.g., RBs), if the value obtained by modulating the physical cell ID of the cell transmitting the LP-WUS / LP-SS by N is K, the base station can use overlay sequence #1 for the Kth subcarrier / subcarrier group among N, and use overlay sequence #2 for the remaining N-1 subcarriers / subcarrier groups. The above sequences #1 and #2 mean different sequences (in terms of sequence type, cyclic shift, power, etc.).

[0159] When a base station transmits LP-WUS / LP-SS over N OOK / OFDM symbols, the base station can transmit (part of) the physical cell ID by applying a specific spreading code to the overlay sequence.

[0160] [Method #B2] The base station can set the type of information to be transmitted through the overlay sequence and transmit different information accordingly.

[0161] The base station can transmit LP-WUS content by transmitting consecutive OOK symbols. At this time, the LP-WUS content can be a terminal ID, a terminal group ID, an SI change / update instruction, disaster information such as ETWS / CMAS, cell information, etc. Since the most important purpose of introducing LP-WUS is to wake up the MR of a terminal or a terminal group, the terminal ID or the terminal group ID can be the primary content of LP-WUS, and other content can be secondary content. However, the distinction between primary content / secondary content is not necessarily limited to this. Meanwhile, the base station can transmit the OOK symbol and the overlay sequence together, and the LP-WUS content can also be transmitted through this. Instead of transmitting the LP-WUS content in the overlay sequence, the base station may transmit a known sequence (predefined and recognizable to the terminal). This case will be referred to as "no content reception" in the following proposal.

[0162] [Method B2-1] The base station can transmit LP-WUS content in one of the following ways.

[0163] ● Alt-1: The base station transmits the primary content through OOK symbol transmission, and can also transmit the primary content through an overlay sequence.

[0164] ● Alt-2: The base station can transmit the primary content through OOK symbol transmission and the non-content through an overlay sequence.

[0165] ● Alt-3: The base station can transmit the primary content through OOK symbol transmission and the secondary content through an overlay sequence.

[0166] ● Alt-4: The base station can transmit the non-content through OOK symbol transmission and transmit the primary content through an overlay sequence.

[0167] ● Alt-5: The base station can transmit the secondary content through OOK symbol transmission and the primary content through an overlay sequence.

[0168] ■ For example, a simple wake-up instruction (eg, 1 bit) may be transmitted through the OOK symbol transmission, and a terminal ID or terminal group ID may be transmitted through the overlay sequence.

[0169] ■ For example, a simple wake-up instruction (e.g., 1 bit) can be transmitted through OOK symbol transmission, and cell information, ETWS / CMAS, and SI change information can be transmitted through overlay sequence.

[0170] ● Alt-6: The base station can transmit a part of the secondary content through OOK symbol transmission and another part of the secondary content through an overlay sequence.

[0171] ■ For example, a terminal group ID can be transmitted through OOK symbol transmission, and a terminal identifier (or terminal ID) within the terminal group can be transmitted through an overlay sequence.

[0172] Specifically, the base station can transmit LP-WUS content using one of the above Alt-1 / 2 / 3 methods for a terminal in RRC idle mode / inactive mode. In addition, the base station can transmit LP-WUS content using one of the above Alt-1 to Alt-6 methods for a terminal in RRC connected mode.

[0173] Specifically, the base station can transmit specific LP-WUS content for terminals in RRC idle mode / RRC inactive mode via OOK symbol transmission, and (different) specific LP-WUS content for terminals in RRC connected mode via overlay sequence. For example, the base station can transmit DRX on / off information via OOK symbol transmission, and transmit a flag indicating / triggering PDCCH monitoring via overlay sequence.

[0174] The base station can configure which LP-WUS content to transmit for OOK symbol transmission and overlay sequence transmission, respectively, through upper layer parameters. Alternatively, the base station can configure / indicate this information using the preamble part of LP-SS or LP-WUS.

[0175] [Method #B3] The base station can change the overlay sequence transmission method depending on the number of OOK / OFDM symbols required for overlay sequence transmission.

[0176] [Method B3-1] The base station can transmit the same content as the LP-WUS / LP-SS content transmitted through the OOK symbol through the overlay sequence. The number of bits that can be transmitted through the overlay sequence may vary depending on the number of (valid) samples of OOK / OFDM. Alternatively, when the overlay sequence is transmitted through FD overlaying, the base station can transmit the LP-WUS / LP-SS content of multiple bits through a small number (e.g., 1) of OOK / OFDM symbols. In this case, the base station can transmit the LP-WUS content in some OOK / OFDM symbols, and not transmit the LP-WUS content in other symbols, or can repeatedly transmit the LP-WUS content. In the following proposal, we will denote as N the number of OOK / OFDM symbols required by a base station to transmit a specific LP-WUS / LP-SS content using only OOK modulation, and as K the number of OOK / OFDM symbols required to transmit the corresponding LP-WUS / LP-SS content using only overlay sequences.

[0177] ● Example 1: If K=N, the base station can transmit an overlay sequence using a TD overlay or FD overlay sequence for N OOK / OFDM symbols.

[0178] ● Example 2: If K = 1, the base station can repeatedly transmit the overlay sequence used for one (e.g., the first) OOK / OFDM symbol for every OOK / OFDM symbol.

[0179] ● Example 3: If N is twice K, the base station can transmit the overlay sequence used for half of the OOK / OFDM symbols repeatedly twice during N OOK / OFDM symbols. Generalizing, if N is X times K, the base station can transmit the overlay sequence used for K OOK / OFDM symbols repeatedly X times during N OOK / OFDM symbols.

[0180] [Method B3-2] The base station may transmit an overlay sequence for transmitting LP-WUS content on some OOK / OFDM symbols and transmit a specific known sequence (also known to the terminal) as an overlay sequence on other symbols.

[0181] ● Example 1: If K = 1, the base station can transmit the corresponding LP-WUS content via an overlay sequence in one (e.g., the first) OOK / OFDM symbol, and transmit the known sequence (without transmitting the LP-WUS content) in the remaining N-1 symbols.

[0182] ● Example 2: If N is twice K, the base station can transmit the corresponding LP-WUS content via an overlaid sequence for half of the OOK / OFDM symbols (from the front), and transmit the known sequence (without transmitting the LP-WUS content) for the remaining half of the symbols (from the back). In general, if N is X times K, the base station can transmit the corresponding LP-WUS content via an overlaid sequence for K OOK / OFDM symbols (from the front), and transmit the known sequence (without transmitting the LP-WUS content) for the remaining NK symbols (from the back).

[0183] The method by which the N, K or base station transmits the overlay sequence, known sequence, etc. mentioned in the above proposal may be predetermined or set / indicated by the base station as a higher layer parameter. Alternatively, it may be set / indicated through the preamble part of LP-SS or LP-WUS.

[0184] 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.

[0185] A-IoT (Ambient Internet of Things)

[0186] 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.

[0187] 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.

[0188] 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).

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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).

[0195] Implementation example

[0196] Figure 9 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] However, in the case of an A-IoT device, only the first receiver among the first and second receivers may be included.

[0202] In addition to the basic operations of Figure 9, the operations described for entities A and B can be combined.

[0203] Figure 10 is a flowchart that further concretizes a signal transmission and reception method according to an embodiment of the present invention.

[0204] 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).

[0205] The overlay sequence for LP-WUS can be determined based on Method #A3 and / or Method #B3.

[0206] For example, referring to methods A3-1 and B3-1, the number of symbols required for a base station to transmit specific LP-WUS content using only OOK modulation is defined as N, and the number of symbols required to transmit the specific LP-WUS content using only an overlay sequence is defined as K. Therefore, when the LP-WUS includes specific information in N symbols, an overlay sequence including the same information as the specific information is used for K symbols among the N symbols. The N symbols may be OOK symbols or OFDM symbols. The number of symbols K required for the N symbols of the LP-WUS and the overlay sequence to include the same information may be determined according to the number of candidates for the overlay sequence or may be set by the base station. The K symbols may be the earliest symbols in the time domain among the N symbols. The specific information may be a terminal ID or an ID of a terminal group.

[0207] Specifically, for N symbols, one overlay sequence is used for each symbol. The overlay sequence is used independently for each symbol. Therefore, the overlay sequence can independently correspond to a specific bit value for each symbol. If the number of candidates for the overlay sequence is 2, each candidate corresponds to bit value 0 or 1, and the overlay sequence used for one symbol can express a 1-bit value. If the number of candidates for the overlay sequence is 4, each candidate corresponds to bit value 00, 01, 10, 11, and the overlay sequence used for one symbol can express a 2-bit value. If the number of candidates for the overlay sequence is 2 to the nth power, the overlay sequence used for one symbol can express an n-bit value. If the number of candidates for the overlay sequence is not 2 to the nth power (for example, 2 n -m), the overlay sequence used for one symbol can express values ​​excluding m values ​​among n-bit values.

[0208] As an example, let's assume that N is 10 and the number of overlay sequence candidates is 4. If LP-WUS is modulated in OOK-1 manner, LP-WUS can contain a total of 10 bits of information when N is 10. Since an overlay sequence can express 2 bits of information per symbol, the overlay sequences used for 5 symbols can express 10 bits of information. In this case, K = 5.

[0209] Therefore, the K value can be determined depending on the modulation method of LP-WUS and / or the number of candidates for the overlay sequence.

[0210] For the remaining NK symbols among the above N symbols, the overlay sequence used for the K symbols may be repeatedly used, or the overlay sequence used for the K symbols may not be repeatedly used.

[0211] Referring to methods A3-2 and B3-2, the terminal can decode only K symbols. The terminal can perform ED for the remaining NK symbols. Alternatively, the terminal can obtain an ID for the terminal or an ID for a group of terminals through an overlay sequence within the K symbols, and operate the second receiver without decoding the remaining NK symbols.

[0212] Although this implementation example is described for LP-WUS, the same can be applied to LP-SS as well.

[0213] Examples of communication systems to which the present invention is applied

[0214] 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.

[0215] 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.

[0216] Figure 11 illustrates a communication system (1) applied to the present invention.

[0217] 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.

[0218] 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).

[0219] 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.

[0220] Examples of wireless devices to which the present invention is applied

[0221] Figure 12 illustrates a wireless device applicable to the present invention.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] Hereinafter, 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] Examples of wireless devices to which the present invention is applied

[0230] 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).

[0231] 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).

[0232] 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.

[0233] 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.

[0234] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0235] 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.

[0236] 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. 13, respectively.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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 operating based on reception of the LP-WUS; For the N symbols of the above LP-WUS, one overlaid sequence is used for each symbol, The same information as the information contained in the N symbols is obtained through the overlay sequence(s) used in K symbol(s) among the N symbols. method.

2. In paragraph 1, The above K symbol(s) are the most advanced symbol(s) in the time domain among the above N symbols. method.

3. In paragraph 1, The information contained in the above N symbols includes information about the terminal ID or terminal group ID. method.

4. In paragraph 1, The overlay sequence(s) obtained from the above K symbol(s) are repeated in NK symbol(s) among the above N symbols. method.

5. In paragraph 1, Decoding is performed only for the overlay sequence(s) used for the K symbol(s) among the overlay sequences used for the N symbols above. method.

6. In paragraph 5, ED (energy detection) is performed on NK symbol(s) among the above N symbols. method.

7. In paragraph 5, Based on the ID for the terminal being obtained from the K symbol(s), the second receiver operates without decoding the NK symbol(s). method.

8. In paragraph 5, Based on the ID for the terminal group to which the terminal belongs being obtained from the K symbol(s), the second receiver operates without decoding the NK symbol(s). method.

9. In paragraph 1, The above N symbols are OOK (on-off keying) symbols. method.

10. In paragraph 1, The above K is determined based on the number of candidates for the overlay sequence. method.

11. In paragraph 1, The above K is set by the base station, method.

12. 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 operating based on reception of the LP-WUS; For the N symbols of the above LP-WUS, one overlaid sequence is used for each symbol, The same information as the information contained in the N symbols is obtained through the overlay sequence(s) used in K symbol(s) among the N symbols. Terminal.

13. 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 operating based on reception of the LP-WUS; For the N symbols of the above LP-WUS, one overlaid sequence is used for each symbol, The same information as the information contained in the N symbols is obtained through the overlay sequence(s) used in K symbol(s) among the N symbols. device.

14. 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 operating based on reception of the LP-WUS; For the N symbols of the above LP-WUS, one overlaid sequence is used for each symbol, The same information as the information contained in the N symbols is obtained through the overlay sequence(s) used in K symbol(s) among the N symbols. Storage media.

15. 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 N symbols of the above LP-WUS, one overlaid sequence is used for each symbol, The overlay sequence(s) used for K symbol(s) among the above N symbols are configured to include the same information as the information included in the above N symbols. method.

16. 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 N symbols of the above LP-WUS, one overlaid sequence is used for each symbol, The overlay sequence(s) used for K symbol(s) among the above N symbols are configured to include the same information as the information included in the above N symbols. Base station.

Images