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

Abstract

A method and a device for transmitting and receiving signals in a wireless communication system are disclosed in the present specification, wherein, when a base station and a terminal transmit and receive an LP-WUS, an OOK scheme for modulation and demodulation of the LP-WUS may be configured differently depending on the amount of data.

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, based on whether the amount of data included in the LP-WUS is greater than a specific value, the LP-WUS is demodulated using a first OOK (On-Off Keying) method, and based on whether the amount of data is less than the specific value, the LP-WUS is demodulated using a second OOK method.

[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: a step of setting a modulation scheme of an LP-WUS (Low Power-Wake Up Signal) for a first receiver of a terminal; and a step of transmitting the LP-WUS based on the modulation scheme; wherein, based on whether the amount of data included in the LP-WUS is greater than a specific value, the LP-WUS is modulated with a first OOK (On-Off Keying) scheme, and based on whether the amount of data is less than the specific value, the LP-WUS is modulated with a second OOK scheme.

[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 higher-order categories in that order. For example, a "■" listed after a "●" can be an additional explanation of the "●".

[0075] 1) Receiver (Entity A)

[0076] [Method #A1] The terminal can expect that different transmission methods can be used depending on the amount / length of data transmitted through LP-WUS (or message part), and can be configured / instructed about the corresponding transmission method.

[0077] In this method, a large amount / length of transmitted data may mean that the UE ID or UE (sub)group ID received via LP-WUS is large, or that there are many LP-WUS capable UEs.

[0078] [Method A1-1] If the amount or length of data transmitted through LP-WUS (or message part) is greater than or equal to a specific value, the base station modulates LP-WUS to OOK-4 and transmits it, otherwise, the base station modulates LP-WUS using OOK-1 and transmits it. The terminal may predefine the corresponding operation or be configured by a higher layer parameter. Alternatively, the base station uses repeated transmission if the amount or length of data transmitted through LP-WUS (or message part) is less than (or greater than) a specific value, otherwise, it does not use repeated transmission for LP-WUS (or message part transmission). The terminal may predefine the corresponding operation or be configured by a higher layer parameter.

[0079] ● Additional explanation: When the amount / length of transmission data is long, there may be a disadvantage of relatively long latency due to LP-WUS transmission. If OOK-4 is used when the transmission data is large, the latency can be reduced (compared to when OOK-1 is used). If OOK-1 is used when the transmission data is small or repeated transmission is used, the effect of increased coverage can be expected.

[0080] ● Example 1: The terminal can receive an OOK-4 symbol when the amount or length of data received through LP-WUS (or message part) is greater than a specific value, and can receive an OOK-1 symbol when it is less than a specific value.

[0081] ● Example 2: If the amount or length of data received via LP-WUS (or message part) is greater than a specific value, the terminal can receive an LP-WUS signal generated as OOK-4 and transmitted repeatedly, and if it is less than the specific value, the terminal can receive an LP-WUS signal generated as OOK-1 and transmitted without repetition. Through this, the terminal can perform LP-WUS reception / monitoring operations for the same period regardless of whether OOK-1 or OOK-4 is used.

[0082] ■ For example, if there are two OOK-4 symbols per OFDM symbol, the length of LP-WUS when OOK-4 is used can be half of the length of LP-WUS when OOK-1 is used. If the symbols generated via OOK-4 are repeatedly transmitted twice, the time length can be the same as that of symbols generated via OOK-1. As another example, if there are four OOK-4 symbols per OFDM symbol, the length of LP-WUS when OOK-4 is used can be 25% of the length of LP-WUS when OOK-1 is used. If the symbols generated via OOK-4 are repeatedly transmitted four times, the time length can be the same as that of symbols generated via OOK-1.

[0083] ● The terminal can be defined / set for the above specific value through upper layer parameters or instructed through the preamble part.

[0084] [Method A1-2] If the amount or length of data received via LP-WUS (or message part) is greater than a specific value, the terminal can expect that the LP-WUS (or message part) and CRC will be transmitted together, and if not, the terminal can expect that the LP-WUS (or message part) will be repeatedly transmitted without CRC. The terminal can understand that the LP-WUS (or message part) will be transmitted in one of the two methods according to the transmission data of the LP-WUS (or message part), and can receive the CRC or the repeatedly transmitted LP-WUS signal accordingly.

[0085] ● Additional explanation: CRC is generated with parity bits of a fixed length determined according to (i) the data (or bit values ​​of the baseband side) of the message part(s) or (ii) the data (or bit values ​​of the baseband side) of the preamble part and the message part. The CRC can be transmitted together with the message part. A terminal that receives the CRC can detect errors that occur during transmission by using the reverse process of CRC generation. The CRC length can determine the error detection performance and at the same time, it can be an overhead for LP-WUS transmission. On the other hand, when the data transmitted through LP-WUS is small, it may be advantageous to receive the repeatedly transmitted message part rather than receive the CRC. For example, if the CRC used for LP-WUS is determined to be 16 bits, data that can be transmitted with a shorter length than this can have less overhead when repeatedly transmitted (without CRC) than when the CRC is used.

[0086] ● The terminal can be defined / set for the above specific value through upper layer parameters or instructed through the preamble part.

[0087] [Method #A2] How a terminal sets / receives information about a message part through a preamble part.

[0088] The terminal can receive configuration information for message part(s) (associated with the preamble part) through the preamble part, or can set / be instructed to set configuration information for LP-WUS transmission (including the preamble part). If the terminal receives K bits of information through the preamble part, the terminal can decode the K bits through K OOK / OFDM symbols using the OOK-1 / 4 method. Alternatively, the terminal can find the K bits transmitted through the preamble part by finding the transmitted preamble part using a predefined 2^K sequence. The message part may mean one or more message parts received following the preamble part. Alternatively, one message part may be divided into multiple subparts and received. The proposed method described below can be understood or applied including the above description / conditions.

[0089] [Method A2-1] The terminal can transmit / receive instructions regarding the modulation method (i.e., OOK-1 or OOK-4) used to generate the LP-WUS or message part through the preamble part. In addition, (in combination with the above [Method A1-1]), the terminal can set / receive instructions regarding the amount / length of data included in the LP-WUS through the preamble part.

[0090] ● If the preamble part and the message part are generated with different modulation methods, the terminal can detect the modulation method of the message part by decoding 1 or 2 bits used to indicate the modulation method among the K bits included in the preamble part.

[0091] ● If the preamble part and the message part are generated using the same modulation method, the base station may not issue a separate instruction, and in this case, the terminal can infer the modulation method of the message part by receiving the preamble part.

[0092] [Method A2-2] The terminal can transmit / receive one of the transmission modes of LP-WUS or message part through the preamble part.

[0093] ● The terminal can detect whether the LP-WUS signal (or message part) is for RRC idle mode, inactive mode, or connected mode through some of the information (1 or 2 bits) included in the preamble part.

[0094] ● The terminal can detect, through the information included in the preamble part, whether the LP-WUS signal (or message part) is a signal transmitted to itself (unicast), a signal transmitted to a group of terminals to which it belongs (multicast), or a signal transmitted to multiple arbitrary terminals (broadcast).

[0095] ● The terminal can determine whether it is a specific terminal or a specific terminal group that must receive the LP-WUS signal (or message part) through the information included in the preamble part.

[0096] ■ The terminal may receive an ID for the specific terminal and / or terminal group through the message part. If the ID is N bits, the terminal may detect X bits out of the N bits through the message part, and the remaining NX bits through the preamble part. X may be separately determined or set, and may be set / indicated through the preamble part.

[0097] [Method A2-3] A terminal can determine whether it or a terminal group it belongs to needs to receive (multiple) LP-WUS or message parts by receiving the preamble part.

[0098] ● For example, in a situation where N message parts are received consecutively after the preamble part, and each message part is transmitted to a specific terminal or terminal group (or a situation where the ID of a specific terminal or the ID of a specific terminal group is transmitted), information about which terminal and / or terminal group each of the N message parts is a signal transmitted to can be transmitted through the preamble part. The preamble part can include a bitmap for each message part. The preamble part can also include information about whether each of the N parts is valid. The terminal can determine the signal transmitted to itself or to the terminal group to which it belongs by receiving the preamble part.

[0099] ● Alternatively, if 16 terminals are included in one terminal group, and the terminal group is further divided into 4 subgroups, and 4 message parts are transmitted to a specific terminal, the base station can inform the terminal of the valid parts of the 4 message parts to be transmitted thereafter in the form of a pattern through the preamble part. The terminal can selectively receive the message part by detecting the pattern through reception of the preamble part.

[0100] [Method A2-4] The terminal can be instructed through the preamble part whether the LP-WUS or message part and CRC are transmitted together.

[0101] ● For example, the terminal can determine that a CRC is transmitted together with the message part if the decoding result of the information included in the preamble part is 1, and that it is not transmitted together if it is 0.

[0102] ● If, depending on the base station settings, the length of the LP-WUS signal or the length of the message part (or subpart) is less than a certain value, the CRC may not be transmitted and the message part (or subpart) may be repeatedly transmitted. The terminal can be instructed through the preamble part which method, CRC or repeated transmission, was applied.

[0103] [Method A2-5] The terminal can transmit / indicate whether an overlay sequence is used in the LP-WUS or message part through the preamble part and / or the mode (or type) of the used overlay sequence (if one of multiple modes / types can be used for the overlay sequence).

[0104] ● For example, the terminal can determine whether to use the overlay sequence, regardless of the type of the overlay sequence, based on whether the decoding result of the preamble part is 0 or 1.

[0105] ● Alternatively, the terminal may be instructed with configuration information related to the overlaid sequence. For example, the terminal may determine through the preamble part whether the overlaid sequence conveys the same information as the OOK waveform (without overlaid sequence), whether the overlaid sequence uses a known sequence (without specific information), or whether a different sequence (or different cyclic shift values) is used for each OOK symbol or OFDM symbol.

[0106] [Method #A3] A method in which a terminal receives multiple preamble structures in advance and selectively receives the preamble part transmitted by the base station.

[0107] [Method A3-1] The terminal can be configured (in advance) with preamble part structures of different lengths, and when the base station selects one of them, the terminal can receive the preamble part by receiving the corresponding configuration / instruction.

[0108] ● The terminal can predetermine or be configured through a higher layer parameter that the base station generates the OOK signal of the LP-WUS and the preamble part using the same SCS as the SCS of the NR signal / channel that is multiplexed in the frequency domain with the LP-WUS. In this way, the preamble part and the LP-WUS signal that includes it can be aligned with the OFDM symbol boundary for the NR signal / channel that is multiplexed in the frequency domain with the LP-WUS signal.

[0109] ■ For example, the base station can generate an OOK signal using the subcarrier of the SCS of the OFDM symbol of the MR that is frequency multiplexed with the LP-WUS, depending on the SCS of the corresponding SCS. If the base station generates the OOK signal using a value different from the SCS of the OFDM symbol of the MR, the base station may need a separate IFFT to generate the OOK symbol of the LP-WUS. This may increase the complexity of the transmitter / receiver of the LP-WUS because the intervals of the OFDM symbol of the MR and the OOK symbol that is frequency multiplexed may be different.

[0110] ● The terminal can predefine the preamble structure with short length and long length or can be configured through upper layer parameters. The terminal can be instructed in advance about the structure transmitted by the base station and receive the LP-WUS and preamble parts accordingly.

[0111] ■ When transmitting LP-WUS for terminals requiring large coverage or high speed, a long preamble may be used.

[0112] ■ In multi-beam scenarios or TDD (time division duplex) frame structures, a short preamble can be used.

[0113] ■ If the modulation method of the message part transmitted following the preamble part is OOK-1, a short preamble can be used, and if it is OOK-4, a long preamble can be used.

[0114] ● The terminal may specify in advance or be set / instructed through upper layer parameters that a long preamble generated by the base station repeating a specific short preamble is to be used for transmission of LP-WUS.

[0115] ■ For example, the base station can define / configure a preamble of a specific length using a specific sequence (predefined in advance or configurable through a higher layer parameter) (referred to as a short preamble). In addition, the base station can define / configure a long preamble by concatenating 2 / 4 / 8 of the short preambles in succession. The number of short preambles for configuring a long preamble can be predefined or configured through a higher layer parameter. Specifically, when OOK-4 is used as a modulation method, the number M of OOK-4 symbols that can be transmitted per OFDM symbol can be the number of short preambles repeated for configuring a long preamble. The terminal can understand such base station operation and, by preconfiguring / instructing the transmitted preamble structure / type, can appropriately receive various preambles according to their formats.

[0116] ■ As another example, if the above short preamble is repeated X times, the base station may also repeatedly transmit the message part (and CRC) transmitted thereafter the same number of times. The terminal may specify this behavior in advance or be informed of it through a setting / instruction via the preamble part or upper layer parameters.

[0117] [Method A3-2] Additionally, the following two methods can be considered as proposed methods for configuring an LP-WUS signal including a preamble part.

[0118] ● The base station may (or may not) apply an overlay sequence to the OOK / OFDM symbol transmitted as the preamble part. The terminal may be configured / instructed for this operation through a higher layer parameter. Similarly, the base station may (or may not) apply an overlay sequence to the OOK / OFDM symbol transmitted as the CRC. The terminal may be configured / instructed for this operation through a higher layer parameter.

[0119] ● If MC (Manchester encoding) is not set for OOK symbol generation for LP-WUS, if ON symbols are continuously long or OFF symbols are continuously long among OOK symbols, clock synchronization performance in LP-WUR may deteriorate or AGC (Automatic Gain Control) performance may be affected.

[0120] ● To solve this, scrambling can be applied to the preamble part or the message part. That is, to avoid consecutive OFF symbols, the order of the OOK symbols can be randomized according to a predetermined pattern (or by applying one of multiple predetermined patterns). In this case, the terminal can be configured / instructed to use one of the predetermined patterns or multiple patterns transmitted by the base station.

[0121] ● Alternatively, simple line coding can be applied when generating OOK symbols. For example, if a method known as run length limited (RLL) encoding is used, the number of consecutive ON symbols or consecutive OFF symbols among the generated OOK symbols can be controlled regardless of the data values ​​carried in the LP-WUS (or message part). The terminal can predefine several types of RLL methods or be configured through upper layer parameters, and can be configured / instructed through the preamble part the OOK method used for generating the LP-WUS and the RLL type applied thereto.

[0122] 2) Transmitter (Entity B):

[0123] [Method #B1] The base station can change the transmission method depending on the amount / length of data transmitted through LP-WUS (or message part).

[0124] In this method, a large amount / length of transmitted data may mean that the UE ID or UE (sub)group ID received via LP-WUS is large, or that there are many LP-WUS capable UEs.

[0125] [Method B1-1] If the amount or length of data transmitted via LP-WUS (or message part) is greater than or equal to a specific value, the base station modulates LP-WUS to OOK-4 and transmits it; otherwise, the base station modulates LP-WUS using OOK-1 and transmits it. Alternatively, the base station may use repetitive transmission if the amount or length of data transmitted via LP-WUS (or message part) is less than (or greater than) a specific value, and otherwise, may not use repetitive transmission for LP-WUS (or message part transmission).

[0126] ● Additional explanation: When the amount / length of transmission data is long, there may be a disadvantage of relatively long latency due to LP-WUS transmission. If OOK-4 is used when the transmission data is large, the latency can be reduced (compared to when OOK-1 is used). If OOK-1 is used when the transmission data is small or repeated transmission is used, the effect of increased coverage can be expected.

[0127] ● Example 1: The base station can reduce delay by using OOK-4 when the amount or length of data transmitted through LP-WUS (or message part) is greater than a certain value, and increase coverage by using OOK-1 when it is less than a certain value.

[0128] ● Example 2: The base station can repeatedly transmit an LP-WUS signal generated with OOK-4 when the amount or length of data transmitted via LP-WUS (or message part) is greater than a certain value, and can transmit an LP-WUS signal generated with OOK-1 without repetition when it is less than the certain value. This allows the base station to maintain the same LP-WUS transmission length (regardless of whether OOK-1 or OOK-4 is used).

[0129] ■ The length of LP-WUS when OOK-4 is used can be half of the length of LP-WUS when OOK-1 is used. If symbols generated via OOK-4 are repeatedly transmitted twice, the time length can be the same as that of symbols generated via OOK-1. As another example, if there are 4 OOK-4 symbols per OFDM symbol, the length of LP-WUS when OOK-4 is used can be 25% of the length of LP-WUS when OOK-1 is used. If symbols generated via OOK-4 are repeatedly transmitted 4 times, the time length can be the same as that of symbols generated via OOK-1.

[0130] The base station can define / set the above specific values ​​through upper layer parameters or indicate them through the preamble part.

[0131] [Method B1-2] If the amount or length of data transmitted via LP-WUS (or message part) is greater than a specific value, the base station may transmit the LP-WUS (or message part) together with the CRC, and if not, may repeatedly transmit the LP-WUS (or message part) without the CRC. The base station may transmit the LP-WUS (or message part) using one of the two methods described above, depending on the transmission data of the LP-WUS (or message part).

[0132] ● Additional explanation: CRC is generated with parity bits of a fixed length determined according to (i) the data (or bit values ​​of the baseband side) of the message part(s) or (ii) the data (or bit values ​​of the baseband side) of the preamble part and the message part. The CRC can be transmitted together with the message part. A terminal that receives the CRC can detect errors that occur during transmission by using the reverse process of CRC generation. The CRC length can determine the error detection performance and at the same time, it can be an overhead for LP-WUS transmission. On the other hand, when the data transmitted through LP-WUS is small, it may be advantageous to repeatedly transmit the message part rather than using the CRC. For example, if the CRC used for LP-WUS is determined to be 16 bits, data that can be transmitted with a shorter length can have less overhead when repeatedly transmitted (without a CRC) than when using the CRC.

[0133] ● The base station can define / set the above specific value through upper layer parameters or indicate it through the preamble part.

[0134] [Method #B2] How the base station sets / indicates information about the message part through the preamble part.

[0135] The base station can transmit configuration information for message part(s) (associated with the preamble part) or configuration information for LP-WUS transmission (including the preamble part) via the preamble part. If the base station transmits K bits of information via the preamble part, the K bits can be transmitted via K OOK / OFDM symbols using the OOK-1 / 4 method. Alternatively, the base station can transmit the K bits to the terminal by modulating one of the predefined 2^K sequences using the OOK-1 / 4 method and transmitting it as the preamble part. The message part may mean one or more message parts transmitted following the preamble part. Alternatively, one message part may be divided into multiple subparts and transmitted. The proposed method described below can be understood or applied including the above description / conditions.

[0136] [Method B2-1] The base station can transmit / indicate the modulation method (i.e., OOK-1 or OOK-4) used to generate the LP-WUS or message part through the preamble part. In addition, (in combination with the above [Method B1-1]), the base station can set / indicate information about the amount / length of data included in the LP-WUS to the terminal through the preamble part.

[0137] ● When the preamble part and the message part are generated with different modulation methods, 1 or 2 bits out of the K bits included in the preamble part can be used to convey information about the modulation method of the message part.

[0138] ● If the preamble part and the message part are generated using the same modulation method, the base station may not issue a separate instruction, and in this case, the base station may expect that the terminal can infer the modulation method of the message part through reception of the preamble part.

[0139] [Method B2-2] The base station can transmit / indicate one of the transmission modes of the LP-WUS or message part through the preamble part.

[0140] ● The base station can indicate to the terminal whether the LP-WUS signal (or message part) is for RRC Idle mode, Inactive mode, or Connected mode using 1 or 2 bits of information included in the preamble part.

[0141] ● The base station can inform, through the preamble part, whether the LP-WUS signal (or message part) is a signal transmitted to a specific terminal (unicast), a signal transmitted to a specific group of terminals (multicast), or a signal transmitted to multiple arbitrary terminals (broadcast).

[0142] ● The base station can provide information about a specific terminal or a specific group of terminals that should receive the LP-WUS signal (or message part) through the preamble part.

[0143] ■ However, the base station can transmit the ID for the specific terminal / terminal group through the message part. If the ID is N bits, the base station can transmit X bits out of the N bits through the message part and the remaining NX bits through the preamble part. X can be separately determined or set, and the base station can also inform the terminal through the preamble part.

[0144] [Method B2-3] The base station can inform a specific terminal or terminal group of the need to receive (multiple) LP-WUS or message parts through the preamble part.

[0145] ● For example, in a situation where N message parts are transmitted consecutively after the preamble part, and each message part is transmitted to a specific terminal or terminal group (or a situation where the ID of a specific terminal or the ID of a specific terminal group is transmitted), information about which terminal and / or terminal group each of the N message parts is a signal transmitted to can be transmitted through the preamble part. The preamble part can include a bitmap for each message part. The preamble part can also include information about whether each of the N parts is valid.

[0146] ● Alternatively, if 16 terminals are included in one terminal group, and the terminal group is further divided into 4 subgroups, and 4 message parts are transmitted, the base station can inform the terminals of the valid parts of the 4 message parts to be transmitted thereafter in the form of a pattern through the preamble part. In this case, each terminal (or terminals belonging to the subgroup) can selectively receive the message part depending on whether the message part is valid or not.

[0147] [Method B2-4] The base station can indicate whether the LP-WUS or message part and CRC are transmitted together through the preamble part.

[0148] ● For example, a base station can indicate whether a CRC is transmitted through a bit (information) that is 1 if the CRC is transmitted and 0 if it is not transmitted.

[0149] ● If the length of the LP-WUS or the length of the message part (or subpart) is less than a certain value, the CRC may not be transmitted and the message part (or subpart) may be repeatedly transmitted. The base station can inform the terminal of which method, CRC or repeated transmission, was applied through the preamble part.

[0150] [Method B2-5] The base station can transmit / indicate whether an overlay sequence is used in the LP-WUS or message part through the preamble part and / or the mode (or type) of the used overlay sequence (if one of multiple modes / types can be used for the overlay sequence).

[0151] ● For example, regardless of the overlay sequence type, the base station can inform the terminal whether or not to use the overlay sequence through a bit (information) expressed as 0 or 1.

[0152] ● Alternatively, the base station may inform the terminal of configuration information related to the overlaid sequence. For example, the base station may inform the terminal through the preamble part whether the overlaid sequence transmits the same information as the OOK waveform (without overlaid sequence), whether the overlaid sequence uses a known sequence (without specific information), or whether a different sequence (or different cyclic shift values) is used for each OOK symbol or OFDM symbol.

[0153] [Method #B3] How to set up multiple preamble structures and transmit them selectively

[0154] [Method B3-1] The base station can set preamble part structures of different lengths and selectively transmit one of them.

[0155] ● The base station can generate the OOK signal of the LP-WUS and the preamble part using the same SCS as the SCS of the LP-WUS and the NR signal / channel multiplexed in the frequency domain. In this way, the transmission of the preamble part and the LP-WUS containing it can be aligned with the OFDM symbol boundary for the LP-WUS signal and the NR signal / channel multiplexed in the frequency domain.

[0156] ■ For example, the base station can generate an OOK signal using the subcarrier of the SCS of the OFDM symbol of the MR that is frequency multiplexed with the LP-WUS, depending on the SCS of the corresponding SCS. If the base station generates the OOK signal using a value different from the SCS of the OFDM symbol of the MR, the base station may need a separate IFFT to generate the OOK symbol of the LP-WUS. This may increase the complexity of the transmitter / receiver of the LP-WUS because the intervals of the OFDM symbol of the MR and the OOK symbol that is frequency multiplexed may be different.

[0157] ● The base station can generate and transmit the LP-WUS and preamble part by selecting one of the preamble structures with a short length or a long length.

[0158] ■ When transmitting LP-WUS for terminals requiring large coverage or high speed, a long preamble may be used.

[0159] ■ In multi-beam scenarios or TDD (time division duplex) frame structures, a short preamble can be used.

[0160] ■ If the modulation method of the message part transmitted following the preamble part is OOK-1, a short preamble can be used, and if it is OOK-4, a long preamble can be used.

[0161] ● The base station can use a long preamble generated by repeating a specific short preamble for transmission of LP-WUS.

[0162] ■ For example, the base station can define / configure a preamble of a specific length using a specific sequence (which is predefined or configurable through a higher layer parameter) (referred to as a short preamble). In addition, the base station can define / configure a long preamble by concatenating 2 / 4 / 8 of the short preambles in succession. The number of short preambles for configuring a long preamble can be predefined or configured by the base station through a higher layer parameter. Specifically, when OOK-4 is used as a modulation method, the number M of OOK-4 symbols that can be transmitted per OFDM symbol can be the number of short preambles repeated for configuring a long preamble.

[0163] ■ As another example, if the above short preamble is repeated X times, the base station can also repeatedly transmit the message part (and CRC) transmitted thereafter the same number of times. [Method B3-2] In addition, the following two methods can be considered as proposed methods for configuring an LP-WUS signal including a preamble part.

[0164] ● The base station can apply (or not apply) an overlay sequence to the OOK / OFDM symbol transmitted as the preamble part. The base station can configure / instruct this through upper layer parameters. Similarly, the base station can apply (or not apply) an overlay sequence to the OOK / OFDM symbol transmitted as CRC. The base station can configure / instruct this through upper layer parameters.

[0165] ● If MC (Manchester encoding) is not set for OOK symbol generation for LP-WUS, if ON symbols are continuously long or OFF symbols are continuously long among OOK symbols, clock synchronization performance in LP-WUR may deteriorate or AGC (Automatic Gain Control) performance may be affected.

[0166] ● To solve this, scrambling can be applied to the preamble part or the message part. That is, to avoid consecutive OFF symbols, the order of the OOK symbols can be randomized according to a predetermined pattern (or by applying one of multiple predetermined patterns). In this case, the base station can configure / instruct the terminal for one of the predetermined patterns or one of multiple patterns selected.

[0167] ● Alternatively, simple line coding can be applied when generating OOK symbols. For example, if a method known as run length limited (RLL) encoding is used, the number of consecutive ON symbols or consecutive OFF symbols among the generated OOK symbols can be controlled regardless of the data value carried in the LP-WUS (or message part). The base station can predefine several types of RLL schemes or set them to the terminal through upper layer parameters, and inform the terminal of the RLL type used for the OOK for the corresponding LP-WUS transmission through the preamble part.

[0168] 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.

[0169] A-IoT (Ambient Internet of Things)

[0170] 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.

[0171] 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.

[0172] 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).

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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).

[0179] Implementation example

[0180] Figure 9 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] However, in the case of an A-IoT device, only the first receiver among the first and second receivers may be included.

[0186] In addition to the basic operations of Figure 9, the operations described for entities A and B can be combined.

[0187] Figure 10 is a flowchart that further concretizes a signal transmission and reception method according to an embodiment of the present invention.

[0188] 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 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 setting a modulation method of LP-WUS (S1201), and a step of transmitting LP-WUS based on the modulation method (S1202).

[0189] The modulation method of LP-WUS can be determined based on method #A1 and / or method #B1.

[0190] For example, referring to methods A1-1 and B1-1, the modulation method of the LP-WUS can be determined based on the amount (or length) of data included in the LP-WUS (or message part). Specifically, if the amount of data included in the LP-WUS is greater than (or exceeds) a specific value, the LP-WUS is modulated in the first OOK method, and if the amount of data is less than (or below) the specific value, the LP-WUS is modulated in the second OOK method. When signal modulation is performed at the base station, from the terminal's perspective, if the amount of data included in the LP-WUS is greater than (or exceeds) a specific value, the LP-WUS is demodulated in the first OOK method, and if the amount of data is less than (or below) the specific value, the LP-WUS is demodulated in the second OOK method.

[0191] The amount of data can be determined based on the size of the terminal ID received in the LP-WUS, the size of the terminal (sub)group ID, or the number of terminals that can use the LP-WUS. In addition, since data is expressed in bits, the amount of data can be determined based on the number of bits included in the LP-WUS.

[0192] Specific values ​​can be set via upper layer parameters or preamble parts. Upper layer parameters can be MAC messages, RRC messages, or SIBs.

[0193] The first OOK method may be the OOK-4 method described above, and the second OOK method may be the OOK-1 method described above. Therefore, according to the first OOK method, the length of multiple OOK symbols of LP-WUS corresponds to the length of one OFDM symbol, and according to the second OOK method, the length of one OOK symbol of LP-WUS corresponds to the length of one OFDM symbol.

[0194] Additionally, referring to methods A1-1 and B1-1, whether CRC bits are included in the LP-WUS may be determined based on the amount (or length) of data included in the LP-WUS (or message part). Specifically, if the amount of data included in the LP-WUS is equal to or greater than (or exceeds) a specific value, the LP-WUS may include CRC bits, and if the amount of data included in the LP-WUS is less than (or below) a specific value, the LP-WUS may not include CRC bits. If the LP-WUS does not include CRC bits, data may be repeatedly included in the LP-WUS for transmission reliability.

[0195] A specific value for determining the modulation method of LP-WUS and a specific value for determining whether CRC bits are included in LP-WUS may be set to the same value or to two different values.

[0196] Referring to Method #A2 and Method #B2, LP-WUS may include a preamble part and a message part. Data as referred to in this specification is included in the message part, and the preamble part may include information related to the message part. For example, the preamble part may include information disclosed in Method #A2 and Method #B2, such as a modulation method of the message part, the presence or absence of a CRC, whether data is repeatedly transmitted, the presence or absence of an overlay sequence, a terminal mode, a cast method, and a terminal ID. In addition, the preamble part may be transmitted in the manner described in Method #A2 and Method #B2.

[0197] The structure of the preamble part of LP-WUS can be determined based on Method #A3 and Method #B3.

[0198] For example, the base station may generate the LP-WUS and / or preamble part using the same SCS as the signal being multiplexed in the frequency domain with the LP-WUS. The base station may generate the LP-WUS and / or preamble part using the same SCS as the signal being multiplexed in the frequency domain with the LP-WUS. The signal being multiplexed in the frequency domain with the LP-WUS is a signal received via the second receiver.

[0199] Additionally, the length of the preamble part, whether to apply an overlay sequence, whether to apply scrambling, and whether to apply simple line coding can be determined based on Method #A3 and Method #B3.

[0200] Examples of communication systems to which the present invention is applied

[0201] 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.

[0202] 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.

[0203] Figure 11 illustrates a communication system (1) applied to the present invention.

[0204] 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.

[0205] 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).

[0206] 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.

[0207] Examples of wireless devices to which the present invention is applied

[0208] Figure 12 illustrates a wireless device applicable to the present invention.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] Examples of wireless devices to which the present invention is applied

[0217] 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).

[0218] 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).

[0219] 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.

[0220] 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.

[0221] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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; Based on the amount of data contained in the above LP-WUS being greater than a certain value, the LP-WUS is demodulated using the first OOK (On-Off Keying) method, Based on the amount of said data being less than said specific value, said LP-WUS is demodulated in the second OOK manner. method.

2. In paragraph 1, The amount of the above data is determined based on the size of the terminal ID (identifier) ​​included in the LP-WUS or the size of the terminal group ID. method.

3. In paragraph 1, The amount of the above data is determined based on the number of bits of information included in the LP-WUS. method.

4. In paragraph 1, The above specific value is set through the upper layer parameter, method.

5. In paragraph 1, The above first OOK method is a modulation method in which the length of multiple OOK symbols of the LP-WUS corresponds to the length of one OFDM (Orthogonal Frequency Division Multiplexing) symbol, The above second OOK method is a modulation method in which the length of one OOK symbol of the LP-WUS corresponds to the length of one OFDM symbol. method.

6. In paragraph 1, Based on the amount of the above data being greater than or equal to a second specific value, the LP-WUS includes CRC bits, Based on the amount of said data being less than the second specific value, said LP-WUS does not contain CRC bits, method.

7. In paragraph 6, Based on the amount of said data being less than said second specific value, said LP-WUS repeatedly includes said data, method.

8. In paragraph 1, The above LP-WUS includes a preamble part and a message part. method.

9. In paragraph 8, The above preamble part includes information on whether the modulation method of the message part is the first OOK method or the second OOK method. method.

10. In paragraph 8, The above preamble part is determined based on the SCS (subcarrier spacing) for the signal multiplexed in the frequency domain with the LP-WUS, The signal multiplexed in the frequency domain with the above LP-WUS is a signal for the second receiver. method.

11. 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; and A step of operating the second receiver that has been stopped based on reception of the LP-WUS; Based on the amount of data contained in the above LP-WUS being greater than a certain value, the LP-WUS is demodulated using the first OOK (On-Off Keying) method, Based on the amount of said data being less than said specific value, said LP-WUS is demodulated in the second OOK manner. Terminal.

12. 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; Based on the amount of data contained in the above LP-WUS being greater than a certain value, the LP-WUS is demodulated using the first OOK (On-Off Keying) method, Based on the amount of said data being less than said specific value, said LP-WUS is demodulated in the second OOK manner. device.

13. A computer-readable non-volatile storage medium comprising at least one computer program that causes a terminal including at least one processor to perform an operation, the operation comprising: A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal that has been stopped based on reception of the LP-WUS; Based on the amount of data contained in the above LP-WUS being greater than a certain value, the LP-WUS is demodulated using the first OOK (On-Off Keying) method, Based on the amount of said data being less than said specific value, said LP-WUS is demodulated in the second OOK manner. Storage media.

14. In a method performed by a base station in a wireless communication system, A step for setting a modulation method of LP-WUS (Low Power-Wake Up Signal) for the first receiver of the terminal; and A step of transmitting the LP-WUS based on the above modulation method; Based on the amount of data contained in the above LP-WUS being greater than a certain value, the LP-WUS is modulated using the first OOK (On-Off Keying) method, Based on the amount of said data being less than said specific value, said LP-WUS is modulated in a second OOK manner. method.

15. 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 for setting a modulation method of LP-WUS (Low Power-Wake Up Signal) for the first receiver of the terminal; and A step of transmitting the LP-WUS based on the above modulation method; Based on the amount of data contained in the above LP-WUS being greater than a certain value, the LP-WUS is modulated using the first OOK (On-Off Keying) method, Based on the amount of said data being less than said specific value, said LP-WUS is modulated in a second OOK manner. Base station.

Images