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

Abstract

A method and apparatus for transmitting and receiving a signal in a wireless communication system disclosed in the present specification may receive an LP-WUS through a first receiver, and trigger a second receiver based on the LP-WUS. The length Lw of the OOK symbols of the LP-WUS may be determined based on (i) Nofdm as the length of the OFDM symbols, (ii) Ncp as the length of the CP portions of the OFDM symbols, and (iii) the number N of OOK symbols corresponding to the length of the OFDM symbols.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for use in a wireless communication system. Background Art

[0002] In general, wireless communication systems are being developed to cover a wide range of areas in a diverse manner to provide communication services such as audio communication services, data communication services, and the like. Wireless communication is a multiple-access system that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, the multiple-access system may include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single-carrier frequency division multiple access (SC-FDMA) system, and the like. Summary of the Invention

[0003] Technical issues

[0004] An object of the present disclosure is to provide a signal transmission and reception method and apparatus thereof for efficiently transmitting and receiving signals in a wireless communication system.

[0005] Those skilled in the art should understand that the purposes that can be achieved by using the present disclosure are not limited to the contents specifically described above, and the above and other purposes that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] The present disclosure provides a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0008] In one aspect of the present disclosure, a method for transmitting and receiving signals by a user equipment (UE) in a wireless communication system is provided. The method may include the following steps: receiving a low power wake-up signal (LP-WUS) by a first receiver of the UE; and triggering a second receiver of the UE based on receiving the LP-WUS. The length L_w of an on-off keying (OOK) symbol of the LP-WUS may be determined based on: (i) the length N_ofdm of an orthogonal frequency division multiplexing (OFDM) symbol, (ii) the length N_cp of a cyclic prefix (CP) duration of the OFDM symbol, and (iii) the number N of OOK symbols corresponding to the length of the OFDM symbol.

[0009] In another aspect of the present disclosure, a UE, a processor, and a storage medium as a device that perform a signal transmission and reception method are provided herein.

[0010] The apparatus may include an autonomous driving vehicle communicable with at least a UE, a network, and another autonomous driving vehicle other than the communication apparatus.

[0011] The above-mentioned aspects of the present disclosure are only some preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by those skilled in the art from the following detailed description of the present disclosure.

[0012] Beneficial effects

[0013] According to one embodiment of the present disclosure, when a reference signal is transmitted and received between communication devices, the signal can be transmitted and received more efficiently based on an operation different from that in the related art.

[0014] Those skilled in the art should understand that the effects achievable through the present disclosure are not limited to the contents specifically described above, and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Figure 1 shows the radio frame structure.

[0016] Figure 2 The resource grid during the duration of a time slot is illustrated.

[0017] Figure 3 Figure 1 shows a self-contained time slot structure.

[0018] Figures 4 to 9 is a diagram illustrating a method of transmitting and receiving signals according to an embodiment of the present disclosure.

[0019] Figures 10 to 13 An apparatus according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0020] The following technologies may be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wireless Fidelity (WiFi)), IEEE 802.16 (Worldwide Interoperability for Microwave Access (WiMAX)), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (LTE-A) is an evolution of 3GPP LTE. 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE / LTE-A.

[0021] For clarity of description, the present disclosure will be described in the context of 3GPP communication systems (e.g., LTE and NR), which should not be construed as limiting the spirit of the present disclosure. LTE refers to technology that goes beyond 3GPP TS 36.xxx version 8. Specifically, LTE technology that goes beyond 3GPP TS 36.xxx version 10 is called LTE-A, and LTE technology that goes beyond 3GPP TS 36.xxx version 13 is called LTE-A pro. 3GPP NR is a technology that goes beyond 3GPP TS 38.xxx version 15. LTE / NR may be referred to as a 3GPP system. "xxx" designates a technical specification number. LTE / NR may be collectively referred to as a 3GPP system. Background technology, terms, abbreviations, etc. as used herein refer to technical specifications published prior to this disclosure. For example, reference may be made to the following documents.

[0022] 3GPP NR

[0023] -38.211: Physical channels and modulation

[0024] -38.212: Multiplexing and Channel Compilation

[0025] -38.213: Physical layer procedures for control

[0026] -38.214: Physical layer procedures for data

[0027] -38.300: NR and NG-RAN general description

[0028] -38.331: Radio Resource Control (RRC) Protocol Specification

[0029] Figure 1 The radio frame structure for NR is shown.

[0030] In NR, UL and DL transmissions are configured on a frame basis. Each radio frame has a length of 10 ms and is divided into two 5 ms half-frames. Each half-frame is divided into five 1 ms subframes. A subframe is divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 OFDM (A) symbols. When a normal CP is used, each time slot includes 14 OFDM symbols. When an extended CP is used, each time slot includes 12 OFDM symbols. Symbols may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or discrete Fourier transform-extended-OFDM (DFT-s-OFDM) symbols).

[0031] Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the normal CP case.

[0032] [Table 1]

[0033] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 15KHz (u=0) 14 10 1 30KHz (u=1) 14 20 2 60KHz (u=2) 14 40 4 120KHz (u=3) 14 80 8 240KHz (u=4) 14 160 16

[0034] *N slot symb : Number of symbols in a time slot

[0035] *N frame，u slot : Number of time slots in a frame

[0036] *N subframe，u slot : Number of time slots in a subframe

[0037] Table 2 shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the case of extended CP.

[0038] [Table 2]

[0039] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 60KHz (u=2) 12 40 4

[0040] In the NR system, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) can be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., a subframe, a time slot, or a transmission time interval (TTI)) consisting of the same number of symbols (for convenience, referred to as a time unit (TU)) can be configured differently between the aggregated cells.

[0041] In NR, various numerology sets (or SCSs) can be supported to support various 5th generation (5G) services. For example, a 15kHz SCS can support wide areas in traditional cellular bands, while a 30kHz or 60kHz SCS can support dense urban areas, lower latency, and wide carrier bandwidths. An SCS of 60kHz or higher can support bandwidths greater than 24.25kHz to overcome phase noise.

[0042] The NR frequency band can be defined by two types of frequency ranges, FR1 and FR2. FR1 and FR2 can be configured as described in Table 3 below. FR2 can be millimeter wave (mmW).

[0043] [Table 3]

[0044] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 450MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0045] Figure 2 The resource grid during the duration of one time slot is shown.

[0046] A time slot includes multiple symbols in the time domain. For example, a time slot includes 14 symbols in the normal CP case and 12 symbols in the extended CP case. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interlaces (abbreviated as interlaces) can be defined in the frequency domain. 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 bandwidth part (BWP) can be defined by multiple consecutive (physical) RBs ((P)RBs) in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., five) BWPs. Data communication can be performed in an active BWP, and only one BWP can be enabled for a UE. Each element in the resource grid can be referred to as a resource element (RE), to which a complex symbol can be mapped.

[0047] In a wireless communication system, a UE receives information from a base station (BS) in the downlink (DL) and transmits information to the BS in the uplink (UL). The information exchanged between the BS and the UE includes data and various control information, and various physical channels / signals exist depending on the type / purpose of the information exchanged therebetween. A physical channel corresponds to a set of resource elements (REs) that carry information from a higher layer. A physical signal corresponds to a set of REs that are used by the physical layer but do not carry information from a higher layer. Higher layers include a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and the like.

[0048] DL physical channels include the physical broadcast channel (PBCH), the physical downlink shared channel (PDSCH), and the physical downlink control channel (PDCCH). DL physical signals include the DL reference signal (RS), the primary synchronization signal (PSS), and the secondary synchronization signal (SSS). DL RSs include the demodulation reference signal (DM-RS), the phase tracking reference signal (PT-RS), and the channel state information reference signal (CSI-RS). UL physical channels include the physical random access channel (PRACH), the physical uplink shared channel (PUSCH), and the physical uplink control channel (PUCCH). UL physical signals include the UL RSs. UL RSs include the DM-RS, PT-RS, and the sounding reference signal (SRS).

[0049] Figure 3 The structure of a self-contained time slot is illustrated.

[0050] In the NR system, the frame has a self-contained structure in which DL control channels, DL or UL data, UL control channels, etc. can all be included in one time slot. For example, the first N symbols in the time slot (hereinafter referred to as the DL control region) can be used to send DL control channels, and the last M symbols in the time slot (hereinafter referred to as the UL control region) can be used to send UL control channels. N and M are integers greater than or equal to 0. The resource region (hereinafter referred to as the data region) between the DL control region and the UL control region can be used for DL data transmission or UL data transmission. For example, the following configuration can be considered. List the various parts in chronological order.

[0051] In the present disclosure, a base station (BS) may be, for example, a gNode B (gNB).

[0052] LP-WUS (Low Power Wake-up Signal)

[0053] The above content can be applied in conjunction with the method proposed in this disclosure (described later). Alternatively, the content can illustrate the technical features of the method proposed in this disclosure.

[0054] In addition, the following methods can be equally applied to the above-mentioned NR system (licensed band) or shared spectrum. Therefore, it is obvious that in order to implement the technical concept of the present disclosure in the corresponding system, the terms, expressions, and structures in this document can be modified to be suitable for the system.

[0055] In the Rel-18 NR standard, the introduction of a low-power wake-up signal (LP-WUS) and a separate receiver capable of receiving such a signal (called a low-power wake-up receiver or low-power wake-up radio (LP-WUR)) is being discussed as a new power consumption reduction method, which is slightly different from the power consumption reduction technology for UEs introduced and supported in Rel-16 / 17. If the receiver (DL receiver) in the UE of a conventional NR system is called a main radio / receiver (MR), LP-WUR represents a separate receiver (i.e., a companion radio / receiver) that can be introduced to reduce the power consumption of the MR. The term LP-WUR can be abbreviated to LR.

[0056] Table 4 shows a part of the description in the Study Item Description (SID) of the corresponding discussed item and explains the purpose and background of the introduction of LP-WUS / WUR.

[0057] [Table 4]

[0058]

[0059]

[0060] The present disclosure proposes a method for generating and configuring a waveform or signal structure that can be used as an LP-WUS. Furthermore, the present disclosure proposes a method for monitoring an LP-WUS in an LP-WUR, a synchronization signal (hereinafter referred to as an LP-SS) that can be transmitted for synchronization of the LP-WUR, and an operating method for the LP-WUS / WUR.

[0061] [1] Introduction

[0062] [1-1] In a conventional NR system, the BS generates and transmits an OFDM signal for a control signal / data signal. The UE can receive the OFDM signal using a receiver based on coherent detection / demodulation, which requires (relatively) precise synchronization. To do this, a radio frequency (RF) module and a baseband module that consume a lot of power, such as a bandpass filter, a fast Fourier transform (FFT), and a local oscillator, are required. However, in order to receive signals at low power at the LP-WUR, a receiver based on non-coherent detection / demodulation that does not require such power-consuming modules can be used. In addition, on-off keying (OOK), frequency shift keying (FSK), etc. can be used in the LP-WUS for the receiver. On the other hand, if an LP-WUS is introduced that is generated in a completely different way from the conventional NR signal, there may be a burden on the network provider to construct a transmitter to generate the new signal.

[0063] [1-2] As one method of transmitting an OOK / FSK signal while making the most of the OFDM transmitter of the base station, a (multi-carrier OOK) MC-OOK or multi-carrier FSK (MC-FSK) signal can be used. For example, an MC-OOK (or MC-FSK) signal can refer to a signal generated by creating a time domain waveform similar to an OOK (or FSK) waveform using only some of the OFDM subcarriers. Therefore, reception based on non-coherent detection / demodulation can be achieved at the receiver while allowing (maximum) use of the OFDM transmitter.

[0064] For ease of explanation, the following proposal will be described based on the assumption of MC-OOK. Unless otherwise stated, the proposed methods described below can be equally applied to (or extended for) MC-FSK.

[0065] [1-3] Assuming that the inverse fast Fourier transform (IFFT) size of the OFDM transmitter is "NFFT" and the subcarrier spacing is "SCS", the (time domain) length of the time domain waveform of MC-OOK generated based on OFDM can be determined by NFFT and SCS. In addition, different waveforms can be generated according to the number of subcarriers used to generate MC-OOK among the total subcarriers and the data or sequence modulated on each subcarrier. In the following proposal, a signal of length "L_p" obtained from the generated time domain waveform is called "P_pulse". For example, P_pulse can be generated by time-masking the portion corresponding to L_p from the time domain signal generated by IFFT.

[0066] [1-4] Manchester coding is often used for non-coherent detection of OOK signal reception. In the case of an OOK signal, data can be distinguished as "1" (or "on") or "0" (or "off") depending on whether the power of the received signal exceeds a threshold. Depending on the receiver (or channel conditions), threshold configuration can be a complex process. Manchester coding can be understood as a method of adding a transition, for example, from "1" to "0" or from "0" to "1" in the middle of an OOK symbol and then representing the data as "0" or "1" based on the sequence of transitions. Alternatively, as another example, during the duration of two OOK symbols, "on-off" can represent data "1" and "off-on" can represent data "0" (or vice versa). In the following proposals, the result of applying Manchester coding to P_pulse will be referred to as "M_pulse". In addition, the term "W_pulse" will be used in the following proposals to collectively refer to P_pulse and / or M_pulse (unless otherwise specified). In this case, since the length of M_pulse may be L_p or 2*L_p according to a method of applying Manchester encoding, the length 'L_w' of W_pulse may also mean L_p or 2*L_p according to context.

[0067] [1-5] In the following proposal, the length of an OFDM symbol before adding a CP will be referred to as N_data, and the length of the CP will be referred to as N_cp. The length of an OFDM symbol including the CP (ie, N_data+N_cp) will be referred to as N_ofdm.

[0068] [2] LP-WUS structure in the time domain

[0069] [2-1] A single W_pulse can be used to transmit / indicate one bit. In this case, to transmit / indicate N bits, N consecutive W_pulses can be used. Alternatively, X W_pulses can be used to transmit / indicate one bit. To transmit / indicate N bits, X W_pulses are repeated N times. For illustration, in the following proposal, it is assumed that one bit is mapped to one W_pulse. However, those skilled in the art will appreciate that the same approach is broadly applicable to the case where X W_pulses are mapped to one bit.

[0070] [2-2] As described in [1-2], if only some OFDM subcarriers are used to generate the MC-OOK signal, the remaining subcarriers (not in use) can be used for other purposes. For example, among the NFFT subcarriers, only K subcarriers can be used to generate the LP-WUS, and the remaining "NFFT-K" subcarriers can be allocated for other signals / channels of the MR. Therefore, the LP-WUS can be sent during the same time period as the OFDM symbol for the signal / channel of the MR (that is, the signal can be FDMed), which is an efficient way to use frequency resources. In this case, in order to avoid interference between the LP-WUS and the signal / channel of the MR, the CP-OFDM structure similar to the OFDM waveform of the MR can be used to generate the LP-WUS (where the CP-OFDM structure means that the last N_cp duration of the N_data duration is added as the CP before the N_data duration, so the first N_cp duration and the last N_cp duration of the OFDM symbol of length N_ofdm are the same).

[0071] [2-3] To this end, one of the following methods may be used to define / configure the length of the W pulse: In the following explanation, it is assumed that the duration of transmitting N bits via LP-WUS is the duration of one OFDM symbol of MR.

[0072] - Method 1: In order to transmit N bits via LP-WUS during N_data of an OFDM symbol of an MR, the length L_w of W_pulse may be defined / configured as a value of N_data divided by N, that is, "N_data / N". Figure 4 Option A in is an example of method 1.

[0073] - Method 2: In order to transmit N bits via LP-WUS during the length (N_data-N_cp) of the OFDM symbol of MR, the length L_w of W_pulse may be defined / configured as (N_data-N_cp) divided by N, that is, "(N_data-N_cp) / N". Figure 4 Option D in the example is an example of method 2.

[0074] - Method 3: In order to transmit N bits via LP-WUS during the length (N_data+N_cp) of the OFDM symbol of MR, the length L_w of W_pulse may be defined / configured as (N_data+N_cp) divided by N, that is, "(N_data+N_cp) / N". Figure 4 Option C in the example represents method 3.

[0075] - Method 4: In order to transmit N bits via LP-WUS during the length N_ofdm of the OFDM symbol of the MR, the length L_w of W_pulse may be defined / configured as N_ofdm divided by N, that is, N_ofdm / N. Figure 4 Option B in FIGURE 4 represents an example of Method 4. Referring to Option B, the CP duration may not exist in the LP-WUS.

[0076] Method 1 is a method in which N consecutive W_pulses are generated during the N_data duration of the MR's OFDM symbol (similar to the conventional CP-OFDM configuration method), a final N_cp duration is appended before the N_data, and the N consecutive W_pulses are multiplexed with the MR's OFDM symbol. In addition to the MR's N_cp duration, the LR can perform a series of reception processes (such as envelope detection) within the N_data duration of the received LP-WUS.

[0077] Method 2 is a method in which N consecutive LP-WUS pulses are generated for the first (N_data-N_cp) length of the MR's N_data duration. The LR may perform a series of reception processes (such as envelope detection) for the remaining duration of the received LP-WUS, excluding the MR's N_cp duration and the last N_cp duration of N_data. Compared to Method 1, this method is expected to have a relatively low data rate because, for each N_ofdm, the N_cp duration is not used for LP-WUS data transmission.

[0078] Method 3 is a method in which N consecutive W_pulses are generated during the (N_data + N_cp) length of the MR's OFDM symbol. However, in this case, the CP relationship may no longer be maintained in the symbol obtained by combining the LP-WUS and the MR's OFDM symbol. This may result in deterioration in reception performance. To avoid this, the payload of the LP-WUS may be transmitted only in a (N_data + N_cp - X) portion of (N_data + N_cp - X) length excluding the first "X" length. In this case, X may be a multiple of the minimum value of L_w that is not less than N_cp. In addition to the first X portion, the LR may perform a series of reception processes (such as envelope detection) for the remaining duration of the received LP-WUS.

[0079] In methods 1 / 2 / 3, N_data, N_cp, L_w, etc. can be considered in terms of OFDM samples rather than time units. In this case, if the division result is not an integer, L_w can be determined as an integer number of samples by applying the following functions: floor(), ceil(), or round().

[0080] [2-4] The length of W_pulse can be defined based on one OFDM symbol as in section [2-3] above, but the length of W_pulse can be defined / configured based on a larger specific duration. When N bits are transmitted via the LP-WUS during a specific duration (indicated by D), the length of W_pulse, L_w, can be defined / configured as the value of D divided by N, i.e., "D / N," where D can be 0.5 ms or a multiple thereof. Therefore, when the MR waveform has a long CP every 0.5 ms, if the LR performs envelope detection on the received LP-WUS, the LP may not need to exclude the CP duration that varies every 0.5 ms. If the LP-WUS is received based on the W_pulse determined in this manner, for all CP durations within the D duration of the received LP-WUS, the LR can perform a series of reception processes (such as envelope detection) only for the durations of all LP-WUS pulses excluding those that overlap with the CP.

[0081] If the length L_w is determined as the length of the OOK symbol, actual LP-WUS information may be transmitted except for the OOK symbol overlapped with the CP.

[0082] For stable LP-WUS reception, the LP-WUR may need to find the location of the MR's CP duration (or the start / end point of the D duration). To this end, the UE may be instructed with configuration values such as a parameter set configured for the MR. Alternatively, a separate synchronization signal may be used to accurately find the CP duration (or D duration). Alternatively, the BS may always match the start position of the LP-WUS with the start of the D duration. In this case, the UE can find the D duration (or the CP duration included therein) based on the synchronization process for the LP-WUS.

[0083] [2-5] In Sections [2-3] and [2-4], it is assumed that the length L_w of W_pulse is a divisor of N_data (or (N_data-N_cp) or (N_data+N_cp)) or D. However, the present disclosure is not limited to this. That is, the length of W_pulse can be defined / configured separately from these values. In other words, W_pulse and LP-WUS based thereon can be generated at a specific time / period different from the OFDM symbol unit of MR (however, even in this case, the OFDM transmitter chain of BS can be shared). Since the LP-WUS generated in this manner may cause severe interference to the CP duration of the OFDM symbol of MR, LR may detect LP-WUS after receiving the LP-WUS while excluding the corresponding CP duration. LP-WUS reception may require a separate synchronization signal and synchronization process. Alternatively, in order to simplify the LR structure, LR may detect LP-WUS without excluding the corresponding CP duration. In this case, reception performance may be degraded due to interference. However, considering that the LR does not need to detect the CP duration (or D duration) of the MR for reception, the complexity of the LR can be reduced. In addition, regardless of the parameter set of the MR, the LR can have the advantage of only having to perform consistent operations. For all CP durations of OFDM symbols present within a specific time / period of the received LP-WUS, the LR can perform a series of reception processes (such as envelope detection) only for the durations excluding all LP-WUS pulses overlapping with the CP. Alternatively, the LR can perform a series of reception processes (such as envelope detection) throughout the specific time / period without considering the CP duration of the OFDM symbols within the specific time / period of the received LP-WUS.

[0084] Table 5 shows the options for the LP-WUS waveform generation method agreed upon during the RAN1#112 standardization meeting (February 27 to March 3, 2023).

[0085] [Table 5]

[0086]

[0087]

[0088] When methods 1 / 2 / 3 in sections [2-3] are applied to the OOK options in Table 5, some segments of the IFFT output waveform (e.g., the last N_cp duration of N_data in method 3) may change.

[0089] The OOK-4 method can be considered as follows: To transmit an M-bit LP-WUS payload, the M bits are first transformed into M1 bits / sample (by repeating each bit as M0 bits / sample or mapping each bit to a sequence of M0 bits / sample). Figure 7 After the "Signal Generation and Modification" and / or "DFT / Least Squares" blocks shown, N' bits / samples are generated. N' is then truncated to N and the N bits / samples are input to the IFFT.

[0090] When methods 1 / 2 / 3 in sections [2-3] are applied to OOK-4, it is understood that some parts of M bits, M0 bits / sample, N' bits / sample, or N bits / sample are changed. For example, when method 3 in sections [2-3] is applied to OOK-4, some parts of M bits (e.g., bits / sample corresponding to the last N_cp duration) can be mapped to zero, while M bits are mapped to M1 bits. Alternatively, a specific part (e.g., bits / sample corresponding to the last N_cp duration) can be replaced or copied to other specific parts (e.g., bits / sample corresponding to the first N_cp duration of N_data).

[0091] As another example, the bits / samples corresponding to the last N_cp duration of N_data can be generated to be the same as the bits / samples corresponding to the N_cp duration (which is appended to the front of N_data during the CP insertion process after IFFT), padded with zeros, or padded with dummy data (which is not part of the LP-WUS payload). The receiver (e.g., LP-WUR) can remove or puncture the portion of the LP-WUS corresponding to the last N_cp duration during the reception process (such as envelope detection (depending on the generation method)). Alternatively, the receiver can combine the portion of the LP-WUS corresponding to the last N_cp duration with other portions detected in N_data to extract the LP-WUS payload.

[0092] When applying methods 1 / 2 / 3 in sections [2-3], each W_pulse can be fully modulated (i.e., have energy) across L_w, or some bits / samples can remain unmodulated (i.e., have zero energy). For example, in methods 1 / 2 / 3 in sections [2-3], if N W_pulses are mapped during N_data, (N_data+N_cp), or (N_data-N_cp) durations, each W_pulse can have energy only in half of the length L_w, while the rest can have zero energy. In this case, OOK with energy only in a portion of L_w can be called partial OOK. This helps avoid inter-symbol interference between W_pulses.

[0093] - Among the N W_pulses, partial OOK may be applied only to the first W_pulse and the last W_pulse, while the remaining N-2 W_pulses may be fully modulated across the L_w duration.

[0094] - Alternatively, partial OOK may be applied to odd-numbered (or even-numbered) pulses among the N W_pulses, while the even-numbered (or odd-numbered) pulses may be fully modulated across the L_w duration.

[0095] - A power boost can be applied to the W_pulse to which the partial OOK is applied (proportional to the reduced pulse length).

[0096] - In partial OOK, the modulated segment of L_w (denoted as L_w_1) and the unmodulated segment of L_w (denoted as L_w_2) can have a 1:1 ratio, or the modulated segment and the unmodulated segment can be set to different ratios. The ratio can be predefined or configured through higher layer signaling such as RRC.

[0097] - In partial OOK, the position of the modulation segment (L_w_1) within L_w can be defined as having a length of L_w_1 from the beginning of L_w, at the end of L_w, or in the middle of L_w. The position of the modulation segment can be predefined or configured by higher layer signaling such as RRC.

[0098] - In partial OOK, the length and / or position of the modulation segments within L_w can be configured differently for each cell ID. This can reduce interference between LP-WUS transmitted from different cells.

[0099] - Partial OOK can be applied to some OOK symbols within an OFDM symbol.

[0100] - The zero segment / position of OOK symbols can be configured.

[0101] - Partial OOK may be used only when transitions occur between OOK symbols.

[0102] [3] LP-WUS structure in the frequency domain

[0103] [3-1] When generating an MC-OOK signal, only K subcarriers among the NFFT subcarriers may be used to modulate non-zero data or sequences, and the remaining (NFFT-K) subcarriers may not be used to generate LP-WUS.

[0104] - In this case, (NFFT-K) subcarriers or fewer can be used for MR signals / channels (if a guard band is configured at the end of the K subcarriers) or for NR signals / channels for other UEs.

[0105] [3-2] In this case, the positions of the K subcarriers may be configured / indicated to the UE via RRC, MAC-CE, or DCI. Alternatively, the positions of the K subcarriers may be configured / indicated to the UE as part of the LP-WUS payload.

[0106] - The position of the lowest subcarrier or the highest subcarrier or the position of the middle subcarrier among the K subcarriers can be configured / indicated.

[0107] Alternatively, based on the reference point, an offset from the reference point can be configured / indicated. In this case, the reference point can be the location of the MR's SSB or CRB0. When the UE is in connected mode, the reference point can be the active BWP. Alternatively, the reference point can be the location of the (initial) BWP or CORESET#0.

[0108] Typically, the frequency location (eg, PRB index) assigned to the LP-WUS may be configured / indicated to the UE via RRC, MAC-CE, or DCI. Alternatively, the frequency location may be configured / indicated to the UE as part of the LP-WUS payload.

[0109] - When a plurality of PRBs are allocated to the LP-WUS, the position of the PRB with the lowest index or the highest index among the plurality of PRBs may be configured / indicated, or the position of the middle PRB may be configured / indicated.

[0110] Alternatively, based on the reference point, an offset from the reference point can be configured / indicated. In this case, the reference point can be the location of the MR's SSB or CRB0. When the UE is in connected mode, the reference point can be the active BWP. Alternatively, the reference point can be the location of the (initial) BWP or CORESET#0.

[0111] [3-3]NFFT subcarriers (or frequency positions (eg, PRBs) assigned to LP-WUS) may be FDMed and used for multiple UEs. In other words, each UE may be configured with different K positions (or frequency positions).

[0112] - For example, the RB level offset or RE level offset may be predefined or configured via RRC. A different offset may be configured / indicated to each UE.

[0113] [3-4] The positions of the K subcarriers (or the frequency positions assigned to the LP-WUS) can be determined within the active BWP of the corresponding MR (if the UE is in the RRC connected state). In other words, the value configured via RRC / MAC-CE can be one of the subcarriers or frequencies (e.g., PRB index) corresponding to the active BWP. If the MR and LR share the RF module, this configuration method can reduce UE power consumption and complexity.

[0114] [3-5] Alternatively, the positions of the K subcarriers (or the frequency positions assigned to the LP-WUS) can be determined outside the active BWP of the corresponding MR (if the UE is in the RRC connected state). In other words, the value configured via RRC / MAC-CE can be one of a subcarrier or a frequency (e.g., a PRB index) outside the active BWP. When the MR is awake and receives NR signals / channels, if the LR is also operating simultaneously, this configuration method can be used to separate the frequency resources of the MR and LR.

[0115] - LP-WUS can be configured within an active BWP.

[0116] - LP-SS can be configured outside of the active BWP or within the default BWP.

[0117] [4] Hierarchical LP-WUS structure for coverage enhancement

[0118] [4-1] For low-power reception using LP-WUS, LP-WUR can have a higher noise figure than a conventional NR OFDM receiver. Therefore, the coverage of LP-WUS transmission or LP-WUR reception can be smaller than the coverage of conventional NR paging PDCCH or PUSCH. When a UE configured with LP-WUR is out of coverage, the UE may attempt to detect LP-WUS to wake up the MR (without realizing that the UE is out of coverage). However, this may not be desirable.

[0119] [4-2] To this end, the LP-WUS may consist of two parts. The first part may be robust enough to achieve coverage similar to that of conventional NR, but may not carry much information. The second part may carry more information, but may have a smaller coverage than the first part. For example, the first part may be used only to indicate whether to send the LP-WUS. Alternatively, the first part may include only the control information required to decode the second part. For example, if the UE detects the first part of the LP-WUS consisting of two parts but fails to detect or decode the second part, the UE may recognize that the UE is in a position or situation where it is difficult to correctly receive the LP-WUS / WUR, and then immediately wake up the MR (without further monitoring through the LP-WUR).

[0120] [4-3] A UE-specific LP-WUS and a group-common LP-WUS may be defined. In this case, the group-common LP-WUS may be defined / configured to have a wider coverage. The UE-specific LP-WUS may be defined / configured to send more information. Even if the UE-specific LP-WUS and the group-common LP-WUS are generated based on the same waveform, different configurations may be applied. For example, the (above-mentioned) W_pulse used to generate the two LP-WUS may be the same, but a different number of consecutive W_pulses may be used. If the group-common LP-WUS is detected N times consecutively without receiving / detecting / decoding the UE-specific LP-WUS, the UE may be configured to wake up the MR immediately.

[0121] - If no LP-WUS is detected when receiving LP-SS N times, the UE may wake up the MR.

[0122] - Alternatively, if the UE detects LP-WUS or LP-SS N times but fails to decode all LP-WUS or LP-SS, the UE may wake up the MR.

[0123] [5] Synchronization signal for LP-WUS

[0124] [5-1] A separate synchronization signal for LP-WUS (hereinafter referred to as LP-SS) may be necessary. LP-WUR may not require as accurate reception synchronization as an OFDM receiver. However, depending on the LP-WUR structure, a certain level of synchronization process may be required. In addition, if a (low-cost) local oscillator is used for the LR, a (significant) carrier frequency offset may occur. Alternatively, time drift may also occur due to a phase or sampling frequency difference between the LR's clock and the BS transmitter's clock. Since the LR may not be able to detect / decode signals such as the SSB of the MR, a separate synchronization signal for the LP-WUS / WUR may be introduced for time synchronization of the LR.

[0125] [5-2] LP-SS can be a signal based on the same waveform generation method as that for LP-WUS (to maintain low complexity of the UE). For example, LP-SS can be configured based on the above-mentioned W_pulse. More specifically, LP-SS can be composed of N consecutive W_pulses, where each nth W_pulse corresponds to "1" or "0" (where n=1,..., N). If it is called a sequence of length N, one of the sequences commonly used in conventional NR (e.g., ZC sequence) can be used as such a sequence. The above-mentioned W_pulse can be used to generate LP-WUS and LP-SS, but LP-WUS and LP-SS can be composed of different numbers of W_pulses. For example, LP-WUS can be composed of N W_pulses, and LP-SS can be composed of M W_pulses (where M is, for example, a value greater than N).

[0126] [5-3] LP-SS can be configured in units of X OFDM symbols of MR. For example, LP-SS can be defined as having the same length as one OFDM symbol, or as a continuous sequence having the same length as X OFDM symbols. In this case, the starting point of LP-SS can be aligned with the boundary of the OFDM symbol. This alignment can facilitate FDM between LP-SS and other NR signals / channels within the duration of transmitting LP-SS. Alternatively, when FDM between LP-SS and NR signals / channels is not supported, if LP-SS with such a structure is used, TDM between LP-SS and NR signals / channels can be easily implemented in units of OFDM symbols. In addition, when LP-SS is used, LR can find the boundary of MR's OFDM symbol based on the correlation result with LP-SS. Therefore, synchronization with the LP-WUS signal can be achieved (if LP-WUS is aligned with MR's OFDM symbol).

[0127] As a specific example, a single LP-SS may be set to the length of one MR OFDM symbol. In this case, the unit signal (e.g., W_pulse) corresponding to each bit of the LP-SS may be defined / set to the number of samples of the MR OFDM symbol (e.g., 2048 samples), the number of samples corresponding to its divisor, or the number of 2^n samples within the divisor. In this case, when the unit signal is repeated, a single LP-SS may be transmitted with the same length as the MR OFDM symbol.

[0128] Alternatively, the LP-SS may be transmitted as a signal aligned with a subframe of the MR (or a half subframe in units of 0.5 ms). That is, even if the LP-SS is not aligned with every OFDM symbol, it may be aligned with 0.5 ms or a multiple thereof. In this case, if the UE detects the LP-SS through the LR, the UE may synchronize with the MR in units of 0.5 ms or 1 ms.

[0129] In this case, as a specific example, 2^n samples may be used as a unit signal (e.g., W_pulse) corresponding to each bit of the LP-SS. Alternatively, a single (i.e., continuously transmitted) LP-SS may be defined / determined by using multiple unit signals (e.g., by repeating the unit signal).

[0130] - The details of LP-SS described in [5-3] can also be applied to LP-WUS.

[0131] However, depending on the structure of the LP-WUR, the LP-SS may not need to be aligned with the OFDM symbol (subframe or 0.5-ms half-subframe) of the MR. The UE can achieve approximate time synchronization with the LP-WUS based on the LP-SS and only use the LP-SS for time drift compensation.

[0132] [5-4] LP-SS can be transmitted periodically. If LP-SS is transmitted periodically (i.e., at regular time intervals), it can be used for synchronization, such as time drift compensation. The periodically transmitted LP-SS can also be used for RRM measurements using the LR. In this case, the LP-SS period can be configured to be the same as or a multiple of the DRX cycle configured for the MR (via RRC). If a group-common LP-WUS is introduced, the group-common LP-SS can be transmitted continuously before or after the LP-WUS.

[0133] [5-5] LP-SS may be transmitted in a continuous waveform immediately before each LP-WUS. Alternatively, LP-SS may be transmitted every Nth LP-WUS transmission. For example, if LP-WUS is transmitted periodically aligned with the MR DRX cycle (or at a period corresponding to a multiple or divisor of the MR DRX cycle), LP-SS may also be transmitted periodically at the same period. However, LP-SS may also be configured to be transmitted at a different period (via RRC or similar means).

[0134] [5-6] When a UE is configured with both a group-common LP-WUS and a UE-specific LP-WUS, the LP-SS attached before the group-common LP-WUS may be different from the LP-SS attached before the UE-specific LP-WUS. For example, in the case of a group-common LP-WUS, since the group-common LP-WUS needs to be transmitted to unspecified UEs, a relatively long sequence may be configured in consideration of UEs at the cell edge or UEs with poor channel conditions.

[0135] Refer to OOK-1 / OOK-2 / OOK-3 / OOK-4 in Table 5,

[0136] The LP-WUS can be generated using the OOK-A method using SCS#1, while the LP-SS can be generated using the OOK-B method using SCS#2. In this case, OOK-A and OOK-B may refer to different methods among OOK-1 / OOK-2 / OOK-3 / OOK-4. SCS#1 and SCS#2 represent different SCSs. For example, in the case where the SCS is used to enable simultaneous transmission of NR signals / channels (i.e., FDM) with the LP-WUS, the LP-WUS can be generated using the OOK-4 method, and the LP-SS can be generated using the OOK-1 method using an SCS greater than SCS#1. When the LP-WUS and LP-SS are configured as described above, it can be expected that the LP-SS (which requires a relatively low data rate) has robust performance through OOK-1 transmission, while the LP-WUS can meet relatively high data rates because the LP-WUS is generated based on the OOK-4 method.

[0137] The LP-SS signal can consist of two different parts. The two parts can be concatenated and thus transmitted continuously. In this case, the first part can be generated using the OOK-A method using SCS#1, and the second part can be generated using the OOK-B method using SCS#2. For example, the first part of the LP-SS signal can be generated using the OOK-1 method using a larger SCS than the SCS used for the NR signal, and thus used for coarse synchronization of the LP-WUR. The second part of the LP-SS can be generated using the OOK-4 method using the same SCS as the NR signal, and thus used for fine synchronization of the LP-WUR. Even if the LP-SS is transmitted as two concatenated parts, some UEs can use only one part for synchronization. For example, when the first part is generated using OOK-1 and the second part is generated using OOK-4, as in the above example, UE#1 can receive the first part and the second part for synchronization of LP-WUR, UE#2 (capable of only receiving OOK-1) can use only the first part for synchronization of LP-WUR, and UE#3 (capable of only receiving OOK-4) can use only the second part for synchronization of LP-WUR.

[0138] When the LP-SS consists of two parts as described above, the same sequence can be used to generate the first and second parts. Alternatively, the first and second parts can be generated differently based on the same sequence. Specifically, for OOK-1, the same sequence can be used without repetition, but for OOK-4, the same sequence can be repeated X times. Alternatively, a sequence obtained by phase rotating each sample of the sequence used in OOK-1 can be used to generate OOK-4. For example, the first part can be generated as an OOK-1 waveform using a sequence #1 of length N, and the second part can be generated as an OOK-4 waveform by repeating sequence #1 X times.

[0139] The present disclosure is not limited to the transmission and reception of UL signals and / or DL signals. For example, the present disclosure can also be used for direct communication between UEs. In addition, the term "BS" in the present disclosure can include relay nodes as well as base stations. For example, the operations of the BS described in this document can be performed by a base station, but the operations can also be performed by a relay node.

[0140] Obviously, each of the examples of the proposed method can also be included as an implementation method of the present disclosure, and therefore each example can be considered as a proposed method. Although the above-mentioned proposed methods can be implemented independently, some of the proposed methods can be combined (or merged) and implemented. In addition, it can be provided that information about whether to apply the proposed method (or information about rules related to the proposed method) is sent from the BS to the UE or from the sending UE to the receiving UE in a predefined signal (e.g., physical layer signaling or higher layer signaling).

[0141] Implementation Example

[0142] Figure 9 is a flowchart of a signal transmitting and receiving method according to an embodiment of the present disclosure.

[0143] Reference Figure 9 According to an embodiment of the present disclosure, a signal transmission and reception method may be performed by a UE. The method may include: receiving an LP-WUS through a first receiver (S501), and triggering a second receiver based on the reception of the LP-WUS (S503).

[0144] exist Figure 9 In the embodiment of the present invention, triggering the second receiver may mean activating (waking up) the second receiver. When the second receiver is not activated, the second receiver may be in an ultra-deep sleep state. The ultra-deep sleep state means that most (or more than a certain percentage of all) circuits of the second receiver are turned off. Alternatively, when the second receiver is not activated, the second receiver may be in a deep sleep or light sleep state, in which the circuits are not turned off, but the second receiver does not monitor DL signals (such as PDCCH).

[0145] Apart from Figure 9 In addition to the operations described in Sections [1] to [5], one or more of the operations described in Sections [1] to [5] may also be performed.

[0146] Specifically, referring to the contents of Section [2] (particularly Sections [2-3] and [2-4]), the length L_w of one OOK symbol of LP-WUS is determined based on the following items: (i) the length N_ofdm of the OFDM symbol, (ii) the length N_cp of the CP duration of the OFDM symbol, and (iii) the number N of OOK symbols corresponding to the length of the OFDM symbol. In Sections [2-3] and [2-4], L_W is defined as the length of W_pulse, but referring to Sections [1-4], since W_pulse is generated by Manchester encoding of the OOK symbol duration, the length of W_pulse can be the same as the length of the OOK symbol. The number of OOK symbols corresponding to the length of the OFDM symbol can be equal to the number of bits transmitted in the OOK symbol within the duration corresponding to the length of the OFDM symbol.

[0147] Referring to Section [2-2], only some OFDM subcarriers may be used to transmit OOK symbols, and the unused frequency band may be used for signals / channels in a conventional NR system. Referring to Table 5, in order to multiplex LP-WUS with conventional signals / channels, the IFFT size of CP-OFDM (or CP-OFDMA) and the number of subcarriers used by LP-WUS may be considered. The first receiver may not perform FFT on the received signal to reduce power consumption. If LP-WUS is multiplexed with conventional signals / channels, interference between LP-WUS and other signals / channels may occur due to the CP duration of the conventional signals / channels.

[0148] In Sections [2-3] and [2-4], specific OOK symbol structures are disclosed for mitigating interference that may be caused by multiplexing.

[0149] Referring to Method 1 in Sections [2-3], L_w corresponds to a value obtained by dividing N_data by N, where N_data is the length obtained by excluding N_cp from N_ofdm. According to Method 1, Figure 4 As shown in option A of , a duration obtained by excluding a duration corresponding to the length of the CP duration from a duration corresponding to the length of the OFDM symbol may be divided into N equal segments.

[0150] Referring to Method 2 in Section [2-3], L_w corresponds to a value obtained by subtracting N_cp from N_data and dividing it by N, where N_data is the length obtained by excluding N_cp from N_ofdm. According to Method 2, Figure 4As shown in option D of , a duration obtained by excluding a duration equal to twice the length of the CP duration from a duration corresponding to the length of the OFDM symbol may be divided into N equal segments.

[0151] Referring to Method 3 in Sections [2-3], L_w corresponds to a value obtained by dividing the result of subtracting N_cp from N_data by N, where N_data is the length obtained by excluding N_cp from N_ofdm. In Method 3, L_w is also equal to a value obtained by dividing N_ofdm by N. According to Method 3, Figure 4 As shown in Option C of , the time interval corresponding to the length of the OFDM symbol is divided into N equal segments. In this case, the first segment in the time domain among the N segments includes the CP duration, which may cause performance degradation. Therefore, data for LP-WUS can be included only in the duration obtained by excluding a specific length X from the duration corresponding to the sum of N_data and N_cp (or corresponding to N_ofdm). X may be one segment among the N segments that includes the CP duration. Alternatively, X may include one segment among the N segments that includes the CP duration and one or more segments adjacent to the segment. If a single CP duration overlaps with multiple segments among the N segments, X may include all segments among the N segments that partially or completely overlap with the CP duration in the time domain.

[0152] Referring to Sections [2-4], L_w may correspond to a value obtained by dividing a specific duration D, which includes multiple OFDM symbols and multiple CP durations, by the number N_D of OOK symbols corresponding to D, where N_D refers to the number N of bits transmitted via the LP-WUS during the specific duration D, as described in Sections [2-4], and D may be a period including a long CP. According to conventional 3GPP communication systems, when a normal CP is used, a short CP may correspond to 144κ2^-μ, and a long CP may be 144κ2^-μ+16κ, where κ is a constant and corresponds to 64. In addition, μ refers to a parameter set applied to an OFDM symbol, and 15*2^μ is an SCS value. A long CP is inserted when the OFDM symbol index is 0 and 72^μ (which may have a period of 0.5 ms). Therefore, when D is set to 0.5 ms or a multiple thereof, if the first receiver performs envelope detection on the LP-WUS, the first receiver can omit the process of accurately finding the duration where the long CP is located, thereby reducing the reception complexity of the LR.

[0153] exist Figure 9In the present invention, the first receiver corresponds to a separate receiver for receiving LP-WUS (i.e., LP-WUR), and the second receiver corresponds to a conventional NR receiver (i.e., MR). The specific names may be changed to names other than LP-WUR and MR, but the first receiver is designed to consume relatively less power than the second receiver.

[0154] Apart from Figure 9 In addition to the operations of Figures 1 to 8 One or more of the operations described and the operations described in sections [1] to [5].

[0155] For example, Figure 9 The structure of LP-WUS in the frequency domain can be generated based on section [3]. Figure 9 The LP-WUS in [4] can be composed of two parts based on the previous section. Figure 9 The synchronization signal for LP-WUS can be configured based on section [5].

[0156] Examples of communication systems to which the present disclosure is applied

[0157] The various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure described herein may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0158] More specific examples will be described below with reference to the accompanying drawings.In the following drawings / descriptions, unless otherwise specified, the same reference numerals represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0159] Figure 10 A communication system 1 applied to the present disclosure is illustrated.

[0160] refer to Figure 10, the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. The wireless device is a device that performs communication using a radio access technology (RAT) (e.g., 5G NR (or new RAT) or LTE), also known as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicle may include a vehicle with wireless communication capabilities, an autonomous vehicle, and a vehicle capable of vehicle-to-vehicle (V2V) communication. In this article, the vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television (TV), a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. Handheld devices may include smartphones, smartpads, wearable devices (e.g., smartwatches or smart glasses), and computers (e.g., laptops). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node for other wireless devices.

[0161] Wireless devices 100a to 100f can be connected to a network 300 via a BS 200. AI technology can be applied to wireless devices 100a to 100f, and 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, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via the BS 200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., sidelink communication) without the intervention of the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., V2V / Vehicle-to-Everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0162] Wireless communications / connections 150a, 150b, and 150c can be established between wireless devices 100a to 100f / BS 200, and between BSs 200. Here, wireless communications / connections can be established via various RATs (e.g., 5G NR), such as UL / DL communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay or integrated access backhaul (IAB)). Wireless signals can be sent and received between wireless devices, between wireless devices and BSs, and between BSs via the wireless communications / connections 150a, 150b, and 150c. For example, signals can be sent and received via various physical channels via the wireless communications / connections 150a, 150b, and 150c. To this end, at least a portion of various configuration information for configuring processes for sending / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes can be performed based on various proposals of the present disclosure.

[0163] Examples of wireless devices to which the present disclosure is applied

[0164] Figure 11 A wireless device suitable for use with the present disclosure is shown.

[0165] Reference Figure 11 , the first wireless device 100 and the second wireless device 200 can transmit wireless signals through various RATs (e.g., LTE and NR). {The first wireless device 100 and the second wireless device 200} may correspond to Figure 10 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0166] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may also include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signals, and then transmit a wireless signal including the first information / signals through the transceiver 106. The processor 102 may receive a wireless signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals 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 store software code including instructions for executing all or part of the processing controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. The processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive wireless signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0167] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may also include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, processes, 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 through the transceiver 206. The processor 202 may receive a wireless signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing all or part of the processing controlled by the processor 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. The processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive wireless signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0168] The hardware elements of the wireless devices 100 and 200 will now be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), RRC, and service data adaptation protocol (SDAP)). The one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein and provide the messages, control information, data, or information to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0169] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 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 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be included in one or more processors 102 and 202 or may be stored in one or more memories 104 and 204 and driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, instructions and / or instruction sets using firmware or software.

[0170] One or more memories 104 and 204 can be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 can be configured to include read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cache memory, computer-readable storage media and / or combinations thereof. One or more memories 104 and 204 can be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 can be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0171] One or more transceivers 106 and 206 can transmit user data, control information, and / or wireless signals / channels mentioned in the methods and / or operational flowcharts of this document to one or more other devices. One or more transceivers 106 and 206 can receive user data, control information, and / or wireless signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202 and transmit and receive wireless signals. For example, one or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can transmit user data, control information, or wireless signals to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can receive user data, control information, or wireless signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document through one or more antennas 108 and 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 and 206 may convert received wireless signals / channels from RF band signals to baseband signals so that the received user data, control information, and wireless signals / channels may be processed using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, and wireless signals / channels processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0172] Example of use of a wireless device to which the present disclosure is applied

[0173] Figure 12 Another example of a wireless device applicable to the present disclosure is shown. The wireless device can be configured to perform a wireless operation according to a use case / service (see Figure 10 ) are implemented in various forms.

[0174] Reference Figure 12 , the wireless devices 100 and 200 may correspond to Figure 11The wireless devices 100 and 200 may be configured to include various elements, components, units / portions and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit 110 may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 11 The one or more processors 102 and 202 and / or the one or more memories 104 and 204 of the present invention may include: Figure 11 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and provides overall control of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / instructions / information stored in the memory unit 130. The control unit 120 can transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0175] The additional component 140 may be configured in various ways depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the manner of, but not limited to, a robot ( Figure 10 100a), vehicles ( Figure 10 100b-1 and 100b-2), XR devices ( Figure 10 100c), handheld device ( Figure 10 100d), household appliances ( Figure 10 100e), IoT devices ( Figure 10 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 10 400), BS( Figure 10 200), network nodes, etc. Depending on the use case / service, the wireless device can be mobile or fixed.

[0176] exist Figure 12In the wireless devices 100 and 200, the various elements, components, units / portions, and / or modules may all be connected to each other via a wired interface, or at least a portion thereof may be wirelessly connected via the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected via the communication unit 110. The various elements, components, units / portions, and / or modules in the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured using a collection of one or more processors. For example, the control unit 120 may be configured using a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. In another example, the memory 130 may be configured using RAM, dynamic RAM (DRAM), ROM, flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0177] Examples of vehicles or autonomous driving vehicles to which the present disclosure is applied

[0178] Figure 13 A vehicle or autonomous driving vehicle applicable to the present disclosure is shown. The vehicle or autonomous driving vehicle can be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0179] Reference Figure 13 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive 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 Figure 12 Blocks 110 / 130 / 140.

[0180] The communication unit 110 can send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, base stations (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling components of the vehicle or autonomous vehicle 100. The control unit 120 may include an ECU. The drive unit 140a enables the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering system, etc. The power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include wired / wireless charging circuits, a battery, etc. The sensor unit 140c can acquire information regarding vehicle status, surrounding environment information, user information, etc. The sensor unit 140 c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a location 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, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140 d may implement a technology for maintaining the lane in which the vehicle is traveling, a technology for automatically adjusting the speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a route if a destination is set, etc.

[0181] 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 obtained data. The control unit 120 can control the drive unit 140a so that the vehicle or autonomous driving 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 aperiodically / periodically obtain recent traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c can obtain information about the vehicle status and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 can transmit information about the vehicle's location, autonomous driving route, and / or driving plan to the external server. The external server can use AI technology to predict traffic information data based on information collected from the vehicle or autonomous driving vehicle and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0182] Those skilled in the art will understand that, without departing from the spirit and essential characteristics of the present disclosure, the present disclosure may be implemented in other specific ways than those described herein. Therefore, the above embodiments are to be interpreted in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents (rather than the above description), and all changes that come within the meaning and equivalent range of the appended claims are intended to be encompassed therein.

[0183] Industrial Applicability

[0184] As described above, the present disclosure is applicable to various wireless communication systems.

Claims

1. A method for transmitting and receiving signals by a user equipment (UE) in a wireless communication system, the method comprising the following steps: receiving a low power wake-up signal LP-WUS by a first receiver of the UE; as well as triggering a second receiver of the UE based on receiving the LP-WUS, The length L_w of the on-off keying OOK symbol of the LP-WUS is determined based on the following items: (i) the length N_ofdm of the orthogonal frequency division multiplexing OFDM symbol, (ii) the length N_cp of the cyclic prefix CP duration of the OFDM symbol, and (iii) the number N of OOK symbols corresponding to the length of the OFDM symbol.

2. The method according to claim 1, wherein L_w corresponds to the value obtained by dividing N_data by N, and Here, N_data is the length obtained by excluding N_cp from N_ofdm.

3. The method according to claim 1, wherein L_w corresponds to a value obtained by dividing the result of subtracting N_cp from N_data by N, and Here, N_data is the length obtained by excluding N_cp from N_ofdm.

4. The method according to claim 1, wherein L_w corresponds to a value obtained by dividing the sum of N_data and N_cp by N, and Here, N_data is the length obtained by excluding N_cp from N_ofdm.

5. The method according to claim 4, wherein Data for the LP-WUS is included only in a duration obtained by excluding a specific length X from a duration corresponding to the sum of N_data and N_cp, and Here, X is the minimum value among multiples of L_W that is not less than the CP duration.

6. The method according to claim 1, wherein L_w corresponds to a value obtained by dividing the length D of a specific duration including a plurality of OFDM symbols and a plurality of CP durations by the number N_D of OOK symbols corresponding to D, Wherein, D is the period including the long CP or a multiple of said period, The time period is 0.5 milliseconds.

7. The method according to claim 1, wherein The first receiver consumes relatively less power than the second receiver.

8. The method according to claim 1, wherein L_w is determined based on: (i) the size of the Inverse Fast Fourier Transform (IFFT) of the Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM), and (ii) the number of subcarriers used by the LP-WUS.

9. A user equipment (UE) configured to send and receive signals in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform specific operations, the specific operations comprising: receiving a low power wake-up signal LP-WUS by a first receiver of the UE; and triggering a second receiver of the UE based on receiving the LP-WUS, The length L_w of the on-off keying OOK symbol of the LP-WUS is determined based on the following items: (i) the length N_ofdm of the orthogonal frequency division multiplexing OFDM symbol, (ii) the length N_cp of the cyclic prefix CP duration of the OFDM symbol, and (iii) the number N of OOK symbols corresponding to the length of the OFDM symbol.

10. A device for a user equipment (UE), comprising: at least one processor; as well as at least one computer memory operatively connected to the at least one processor and configured to, when executed, cause the at least one processor to perform operations comprising: receiving a low power wake-up signal LP-WUS by a first receiver of the UE; and triggering a second receiver of the UE based on receiving the LP-WUS, The length L_w of the on-off keying OOK symbol of the LP-WUS is determined based on the following items: (i) the length N_ofdm of the orthogonal frequency division multiplexing OFDM symbol, (ii) the length N_cp of the cyclic prefix CP duration of the OFDM symbol, and (iii) the number N of OOK symbols corresponding to the length of the OFDM symbol.

11. A computer-readable non-volatile storage medium having at least one computer program, wherein the at least one computer program is configured to cause a user equipment (UE) having at least one processor to perform operations, the operations comprising: receiving a low power wake-up signal LP-WUS by a first receiver of the UE; as well as triggering a second receiver of the UE based on receiving the LP-WUS, The length L_w of the on-off keying OOK symbol of the LP-WUS is determined based on the following items: (i) the length N_ofdm of the orthogonal frequency division multiplexing OFDM symbol, (ii) the length N_cp of the cyclic prefix CP duration of the OFDM symbol, and (iii) the number N of OOK symbols corresponding to the length of the OFDM symbol.

Images