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

Abstract

An overlaid sequence can be used for each symbol in LP-WUS and / or LP-SS received through a low power receiver in a terminal of a wireless communication system. When the LP-WUS and / or LP-SS is generated to include the total of N number of OOK symbols, N number of OOK symbols and N number of overlaid sequences are composed of bits including the same information and the orders of the bits can be differently arranged in the time domain.

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 based on reception of the LP-WUS; wherein, for N OOK (on off keying) symbols of the LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol, and N-bit information received through the N overlaid sequences is the same as the N-bit information received through the N OOK symbols, but a bit order of the N-bit information received through the N OOK symbols and a bit order of the N-bit information received through the N overlaid sequences are configured differently in the time domain.

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

[0008] In another aspect of the present invention, a method performed by a base station in a wireless communication system is provided, comprising: determining an overlay sequence for a LP-WUS (Low Power-Wake Up Signal) for a first receiver of a terminal; transmitting the LP-WUS based on the overlay sequence; wherein, for N OOK (on off keying) symbols of the LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol, and N-bit information transmitted through the N overlaid sequences is the same as the N-bit information transmitted through the N OOK symbols, but a bit order of the N-bit information transmitted through the N OOK symbols and a bit order of the N-bit information transmitted through the N overlaid sequences are configured differently in the time domain.

[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] FIGS. 3 to 11 are drawings for explaining a signal transmission and reception method according to an embodiment of the present invention.

[0017] Figures 12 to 15 illustrate devices according to embodiments of the present invention.

[0018] 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.

[0019] 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.

[0020] 3GPP NR

[0021] - 38.211: Physical channels and modulation

[0022] - 38.212: Multiplexing and channel coding

[0023] - 38.213: Physical layer procedures for control

[0024] - 38.214: Physical layer procedures for data

[0025] - 38.300: NR and NG-RAN Overall Description

[0026] - 38.331: Radio Resource Control (RRC) protocol specification

[0027] Figure 1 illustrates the structure of a radio frame used in NR.

[0028] 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).

[0029] 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.

[0030] [Table 1]

[0031]

[0032] 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.

[0033] [Table 2]

[0034]

[0035] 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.

[0036] 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.

[0037] 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).

[0038] [Table 3]

[0039]

[0040] Figure 2 illustrates the slot structure of an NR frame.

[0041] 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.

[0042] 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.

[0043] 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).

[0044] In the present invention, the base station may be, for example, a gNodeB.

[0045] LP-WUS (Low Power Wake-Up Signal)

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] Figures 3 and 4 illustrate options for the LP-WUS waveform generation method.

[0051] Figures 3 and 4 relate to MC-ASK (amplitude shift keying) waveform generation. In Figures 3 and 4, 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 potential guard bands.

[0052] Figure 3 shows option OOK-1.

[0053] 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).

[0054] Figure 4 shows option OOK-5.

[0055] Referring to Fig. 4, in option OOK-4, an M-bit OOK in the time domain is transformed. N subcarriers of OOK-1 are generated by the 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.

[0056] In FIGS. 3 and 4, the modulated subcarriers may be, for example, QAM (Quadrature Amplitude Modulation) symbols, sequences, or other signals.

[0057] 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).

[0058] Besides OOK-1 and OOK-4, there are OOK-2 and OOK-3 as possible options.

[0059] A symbol modified in the OOK manner may be referred to as an OOK symbol. For convenience of writing below, "OOK-1 and / or OOK-4" may be simply written as "OOK-1 / 4".

[0060] 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. 5 shows an example of LP-WUS transmission including a preamble part and a message part.

[0061] 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.

[0062] 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 (Fast Fourier Transform) and / or sequence correlation capabilities in the frequency domain 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In the proposal below, an LP-WUS opportunity may refer to an opportunity at which the preamble part and / or message part of an LP-WUS may be transmitted. In the proposal below, setting an LP-SS / LP-WUS opportunity may be interpreted to mean setting one or more of the LP-SS / LP-WUS period, starting time, ending time, duration, offset within the period, and frequency at which the corresponding signal is transmitted.

[0067] 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.

[0068] 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.

[0069] In this specification, the symbols '●', '■', '◆', and '▶' listed at the very beginning of each paragraph can indicate vertical / horizontal relationships between descriptions in each paragraph. Specifically, '●', '■', and '◆' can indicate upper categories in that order. For example, '■' listed after '●' can be a supplementary explanation for '●'. '◆' listed after '■' can be a supplementary explanation for '■'. '▶' listed after '◆' can be a supplementary explanation for '◆'.

[0070] In various examples of the present disclosure, " / " and "," should be interpreted as indicating "and / or". For example, "A / B" can mean "A and / or B". Furthermore, "A, B" can mean "A and / or B". Furthermore, "A / B / C" can mean "at least one of A, B, and / or C". Furthermore, "A, B, C" can mean "at least one of A, B, and / or C".

[0071] [Method #1] Bit transmission method using OOK symbols and LP-WUS channel structure

[0072] When a base station transmits information bits of the same size via LP-WUS / LP-SS, the number of OFDM / OOK symbols required for transmission may vary depending on the set / applied M value. Referring to Fig. 6, it can be confirmed that the number of information bits that can be transmitted via the same number of OFDM / OOK symbols varies depending on each M value of OOK-4.

[0073] As shown in Fig. 6, different numbers of bits may be transmitted within the same time resource for different M values, but the same number of bits may also be transmitted within the same time resource regardless of the M value. However, the relative lengths of the preamble and CRC in the figures included in this proposed method are arbitrarily expressed for the convenience of writing, and the proposal does not necessarily have to be applied only when the lengths of the preamble and / or CRC are the same or different depending on the M value as shown in Fig. 6, and the proposed method can be applied equally otherwise.

[0074] 1) Transmitter (Entity A):

[0075] ● The base station can determine / set the maximum number of information bits that can be transmitted via LP-WUS / LP-SS based on the M value, or set / determine the (time) resources for transmitting the maximum number of information bits based on the M value, using one of the methods described below (or a combination of two or more). Which of the methods described below to use can be defined in advance or set / instructed to the terminal through upper layer parameters such as RRC and SIB.

[0076] ■ Alt-1: Transmits the same size of information bits through the required (different) OOK / OFDM symbols for each of M=1 / 2 / 4.

[0077] ◆ For example, to transmit 8 bits, M=1 transmits LP-WUS OOK symbol during 8 OFDM symbols, M=2 transmits 4 OFDM symbols, and M=4 transmits LP-WUS OOK symbol during 2 OFDM symbols (see Figure 7)

[0078] ◆ Overlaid OFDM sequence

[0079] ▶ (1) Sequence selection method: An overlaid OFDM sequence of the same length is used regardless of the M value. For example, the same OFDM sequence is overlaid for 2 OFDM symbols (i.e., M=1 corresponds to b1-b2, M=2 corresponds to b1-b4, and M=4 corresponds to b1-b8). In this case, the same overlaid OFDM sequence used for the 2 OFDM symbols may be repeatedly transmitted in the subsequent OFDM symbols (M=1 corresponds to the last 6 symbols, and M=2 corresponds to the last 4 symbols). The terminal may be capable of early termination of LP-WUS / LP-SS monitoring.

[0080] ▶ (2) A method in which the overlaid OFDM sequence is transmitted at the same rate as bit transmission via OOK symbols by using only a single sequence as the overlaid OFDM sequence: Sequences of different lengths can be used for each OOK symbol. Since one bit is transmitted per OOK symbol, early termination of LP-WUS / LP-SS monitoring may be difficult.

[0081] ◆ CRC

[0082] ▶ Since the same bits are transmitted (during different OFDM symbols) regardless of M, a CRC of the same length can be used.

[0083] ▶ A CRC for the overlaid OFDM sequence may be transmitted together to enable early termination of LP-WUS / LP-SS monitoring.

[0084] ■ Alt-2: Different numbers of bits are transmitted depending on M=1 / 2 / 4 through OOK / OFDM symbols of the same number / length.

[0085] ◆ For example, during 2 OFDM symbols, M=1 transmits 2 bits, M=2 transmits 4 bits, and M=4 transmits 8 bits (see Figure 8)

[0086] ◆ Overlaid OFDM sequence

[0087] ▶ (1) Sequence selection method: An overlaid OFDM sequence of the same length is used regardless of M. For example, the same sequence is overlaid for 2 OFDM symbols (i.e., M=1 corresponds to b1-b2, M=2 corresponds to b1-b4, and M=4 corresponds to b1-b8).

[0088] ▶ (2) A method in which the overlaid OFDM sequence is transmitted at the same transmission rate as the bit transmission via the OOK symbol by using only a single sequence as the overlaid OFDM sequence: Sequences of different lengths can be used for each OOK symbol. Since one bit is transmitted per OOK symbol, early termination of LP-WUS / LP-SS monitoring may be difficult.

[0089] ◆ CRC

[0090] ▶ Since different amounts of bits are transmitted depending on M, different length CRCs are used.

[0091] ▶ Alternatively, a method of appending a CRC of the same length to each specific X bit transmission (distributed CRC) can be used. In this case, the CRC positions for different M values ​​can be determined based on the CRC positions appended to the end of a message with M=4. For example, if a CRC is appended to the OOK / OFDM symbol corresponding to the 8th transmission bit when M=4, a CRC can be appended to every OOK / OFDM symbol corresponding to the 4th transmission bit when M=2, and a CRC can be appended to every OOK / OFDM symbol corresponding to the 2nd transmission bit when M=1.

[0092] ■ Alt-3: Through time domain repetition, the same number of bits is transmitted on OFDM / OOK symbols of the same number / length.

[0093] ◆ For example, in each OFDM symbol, M=1 transmits 1 bit without repetition, M=2 transmits 2 bits with repetition, and M=4 transmits 4 bits with repetition. This allows information bits of the same size to be transmitted (regardless of M) during the same OOK / OFDM symbol period (see Fig. 9).

[0094] ◆ Overlaid OFDM sequence: The same method as Alt-1 can be used.

[0095] ◆ CRC: The same method as Alt-1 can be used.

[0096] ■ For the above Alt-1 / 2 / 3, if OFDM / OOK symbols for transmitting maximum information bits (for a specific M value) are not transmitted continuously but are separated and transmitted in TDM (with a gap symbol in between), a preamble (or mid-amble) may be added before each separated part (i.e., after the gap symbol). In addition, each CRC may be attached after each separated part.

[0097] 2) Receiver (Entity B):

[0098] ● The above-mentioned operation of the base station directly (explicitly) setting / instructing or applying / assuming a specific parameter to the terminal can be replaced with an operation of the terminal directly (explicitly) setting / instructing or applying / assuming the parameter from the base station.

[0099] ● The operation of the above base station indirectly (implicitly) setting / instructing or applying / assuming a specific parameter (=parameter #1) to the terminal through another specific parameter (=parameter #2) or a specific operation / mode can be replaced with an operation of the terminal indirectly (implicitly) setting / instructing or applying / assuming parameter #1 from the base station through parameter #2 or the above specific operation / mode.

[0100] ● The terminal can understand how LP-WUS / LP-SS is transmitted by pre-configuring or assuming / defining the transmission method of the base station, and can thus receive / monitor LP-WUS / LP-SS in the required time / frequency resources.

[0101] [Method #2] How to set up an overlaid OFDM sequence

[0102] When a base station transmits an overlaid OFDM sequence together with an LP-WUS / LP-SS, a terminal (including an LP-WUR) capable of detecting and decoding the overlaid OFDM sequence can obtain the information bits transmitted in the overlaid sequence in addition to the information bits transmitted through the OOK symbol, and thus can terminate LP-WUS / LP-SS monitoring even before receiving all OOK symbols (early termination). For example, assuming that K bits are transmitted through an LP-WUS / LP-SS and that N OOK / OFDM symbols are required to transmit all of the K bits, the base station can terminate LP-WUS / LP-SS monitoring by transmitting N1 ( <N)개의 OOK / OFDM 심볼을 통해 K1 (<K) 비트를 전송하고, 나머지 K-K1 비트는 해당 OOK / OFDM 심볼과 함께 (overlaying되어) 전송되는 오버레이드 OFDM 시퀀스를 통해 전달될 수 있다. 이 경우 상기 K-K1 비트는 N-N1개의 OOK / OFDM 심볼을 통해서도 동일하게 전송된다. 만약 단말이 OOK 심볼 및 오버레이드 OFDM 시퀀스를 수신 / 디코딩할 수 있다면, 해당 단말은 N개의 OOK / OFDM 심볼을 모두 수신하지 않고 앞에서부터 N1개의 OOK / OFDM 심볼만 수신해도 K 비트를 모두 검출할 수 있으며, 이를 통해 LP-WUS / LP-SS 모니터링을 빨리 종료할 수 있다. 본 제안 방법에서는 이러한 동작을 위해 기지국 및 단말을 위해 추가로 고려해야 할 부분 및 / 또는 설정 방법을 제안한다.

[0103] 1) Transmitter (Entity A):

[0104] ● The base station may apply / configure one or more of the following methods to early terminate LP-WUS / LP-SS monitoring of terminals capable of processing overlaid OFDM sequences.

[0105] ■ The base station can transmit the CRC for the corresponding LP-WUS / LP-SS in front of the N1 OOK / OFDM symbols. At this time, a CRC that considers all K bits of information bits can be used.

[0106] ◆ A terminal capable of processing an overlay sequence can detect all K bits after receiving the CRC and the subsequent N1 OOK / OFDM symbols.

[0107] ◆ A terminal that cannot process the overlay sequence can detect all K bits after receiving the CRC and all N subsequent OOK / OFDM symbols.

[0108] ■ The base station can transmit the CRC for the corresponding LP-WUS / LP-SS immediately after N1 OOK / OFDM symbols.

[0109] ◆ A terminal capable of processing an overlay sequence can detect all K bits after receiving N1 symbols - CRC in sequence (even if it does not receive all N OOK / OFDM symbols).

[0110] ◆ A terminal that cannot process the overlay sequence can detect all K bits after receiving all N1 symbols - CRC - subsequent N-N1 OOK / OFDM symbols in sequence.

[0111] ■ The base station can transmit LP-WUS / LP-SS to the terminal in N1 OOK / OFDM units in a beam-sweeping manner, and transmit the remaining N-N1 symbols again in a beam-sweeping manner.

[0112] ◆ For example, when a base station transmits LP-WUS / LP-SS through D beams (for example, transmitting in the order of beam#1 to beam#D), it can first transmit N1 OOK / OFDM symbols from beam#1 to beam#D while changing beams, and then transmit N-N1 symbols from beam#1 to beam#D while changing beams.

[0113] ◆ The terminal understands the beam sweeping method of the base station and can receive each OOK / OFDM symbol separately through a beam suitable for LP-WUS / LP-SS reception.

[0114] ■ The base station can transmit the information bits transmitted through the OOK / OFDM symbol and the information bits transmitted through the overlaid OFDM sequence in different orders. The base station can set / instruct the transmission bit order of the OOK symbol and the overlaid sequence to the terminal through one or a combination of two or more of the methods described below.

[0115] ◆ Method-1: By using reverse order each other

[0116] ▶ The transmission order of information bits transmitted through OOK / OFDM symbols and information bits transmitted through overlaid OFDM sequences can be set to be reversed.

[0117] ▶ For example, when N bits (b_1, ..., b_N) are transmitted via N OOK symbols (OOK#1, ..., OOK#N in transmission order) via LP-WUS / LP-SS, b_1 can be transmitted in OOK#1, b_2 can be transmitted in OOK#2, ..., b_N can be transmitted in OOK#N. At this time, the base station can reverse the order of transmitted bits via OOK symbols and overlay sequences by loading b_N in the overlay sequence transmitted in OOK#1, b_(N-1) in the overlay sequence of OOK#2, and b_1 in OOK#N.

[0118] ◆ Method-2: By using indication-based bit order

[0119] ▶ The transmission order of information bits transmitted through OOK / OFDM symbols and information bits transmitted through overlaid OFDM sequences can be changed based on separate instructions.

[0120] ▶ For example, the base station can change the bit order transmitted via the overlay sequence to be different from the bit order transmitted via the OOK symbol according to a specific rule or setting / instruction. For example, the specific rule can be predetermined (according to the Time / Frequency resource through which the LP-WUS / LP-SS is transmitted), set via a higher layer parameter, or set / instructed via a preamble transmitted before the LP-WUS / LP-SS.

[0121] ▶ In the case of a terminal capable of both bit detection through an OOK symbol and bit detection through an overlay sequence through the above method, all N bits can be detected after receiving a specific OOK / OFDM symbol (even before receiving all OOK / OFDM symbols).

[0122] ● The base station can predefine one or more of the following parameters (as overlay sequence-related setting values) or set / instruct the terminal to do so. In this case, the setting / instruction can be performed through upper layer parameters such as RRC, SIB, preamble / midamble, or LP-SS.

[0123] ■ Number of N1 symbols among N OFDM symbols (or N*M OOK symbols) for early termination

[0124] ■ Number of bits per OOK symbol or number of sequences per OOK symbol (Bits per OOK symbol (=B) or number of sequences (=2^B) per OOK symbol)

[0125] ■ For OOK-4, the association or linkage between the above N1 and the number of bits per OOK symbol

[0126] ■ Location of the set of N1 symbols. Can be indicated by code points or bitmaps.

[0127] ■ Whether and how to use the overlaid sequence for N-N1 OOK / OFDM symbols

[0128] ■ Beam-sweeping mode (beam-sweeping in N1 symbol units or beam-sweeping in N symbol units)

[0129] 2) Receiver (Entity B):

[0130] ● The above-mentioned operation of the base station directly (explicitly) setting / instructing or applying / assuming a specific parameter to the terminal can be replaced with an operation of the terminal directly (explicitly) setting / instructing or applying / assuming the parameter from the base station.

[0131] ● The operation of the above base station indirectly (implicitly) setting / instructing or applying / assuming a specific parameter (=parameter #1) to the terminal through another specific parameter (=parameter #2) or a specific operation / mode can be replaced with an operation of the terminal indirectly (implicitly) setting / instructing or applying / assuming parameter #1 from the base station through parameter #2 or the above specific operation / mode.

[0132] ● The terminal can understand how LP-WUS / LP-SS is transmitted by pre-configuring or assuming / defining the transmission method of the base station, and can thus receive / monitor LP-WUS / LP-SS in the required time / frequency resources.

[0133] [Method #3] How to set the preamble and / or CRC

[0134] The number of OOK symbols transmitted per OFDM may vary depending on the M value set in LP-WUS / LP-SS. In this case, the preamble and CRC may also determine the OOK symbol interval according to the M value, similar to the message part (which transmits the actual LP-WUS / LP-SS information bits). The LP-WUS / LP-SS signal may coexist with an NR signal / channel, and in this case, alignment of the LP-WUS / LP-SS transmission with the OFDM symbols (or slots containing them) of the NR signal / channel may be important. For this purpose, a structure in which the preamble and CRC also have different lengths depending on the M value may be advantageous.

[0135] The preamble and / or CRC length and generation method described below can be equally applied when a signal is transmitted using a modulation method such as OOK, FSK (i.e., modulated using a non-coherent modulation / demodulation method rather than the coherent modulation / demodulation of the conventional NR). For the convenience of explanation, the proposed method described below is explained using LP-WUS / LP-SS as an example, but it can also be applied when a signal transmitted on a DL link (or R2D, Reader to device / tag link) and / or UL link (or D2R, Device / tag to reader link) of an ambient IoT system being studied in the 3GPP standardization meeting Rel-19 is a signal such as OOK (and when a preamble / mid-amble / post-amble or CRC is transmitted together with the signal).

[0136] 1) Transmitter (Entity A):

[0137] ● The base station can be configured so that the preamble and CRC are composed of M OOK symbols during one OFDM symbol period (same as the message part). For example, if the M value is set to 1, the CRC length can be 1 OOK symbol or its multiple, if M=2, the CRC length can be 2 OOK symbols or its multiple, and if M=4, the CRC length can be 4 OOK symbols or its multiple (this means that line coding (or FEC) such as Manchester encoding is not applied, and even if they are applied, the CRC can be configured / defined to be composed in OFDM symbol units in the same way).

[0138] ● The base station may set / indicate the preamble (or mid-amble / post-amble) and / or CRC length to one of the multiple values ​​of M (set separately).

[0139] ■ For example, if M can be set to one of 1, 2, or 4, the base station can set / indicate the CRC length to one of 4, 8, or 16.

[0140] ● The base station can predefine one of up to N CRC values ​​or set it through an upper layer parameter, and then set / indicate one of these values, or transmit a CRC or preamble (or mid-amble / post-amble) with the length of the corresponding value together with the LP-WUS / LP-SS signal.

[0141] ● The base station may pad a certain number of 0s (zeros) between the part where the information bits of the LP-WUS / LP-SS are transmitted (or message part) and the CRC (or between the message part and the preamble) to align the NR OFDM symbol (or slot) boundary.

[0142] ■ The above specific number may be set through a higher layer parameter or a preamble, etc. Alternatively, the above specific number may be determined as the minimum number of 0s required until symbol (or slot) boundary alignment is achieved.

[0143] ● Additionally, the CRC lengths specified in some communication / broadcasting standards are as follows: (For example) If the CRC length to be transmitted with LP-WUS / LP-SS is set to one of the values ​​4, 8, or 16 as in the example above, the base station can use the CRC generator polynomial below.

[0144] ■ CRC lengths 4, 8, 16

[0145] ◆ CRC-4 (ITU): x4+x+1

[0146] ◆ CRC-8 (DVB-S2): x8+x7+x6+x4+x2+1

[0147] ◆ CRC-16 (NR = UHF RFID): x16+x12+x5+1

[0148] 2) Receiver (Entity B):

[0149] ● The above-mentioned operation of the base station directly (explicitly) setting / instructing or applying / assuming a specific parameter to the terminal can be replaced with an operation of the terminal directly (explicitly) setting / instructing or applying / assuming the parameter from the base station.

[0150] ● The operation of the above base station indirectly (implicitly) setting / instructing or applying / assuming a specific parameter (=parameter #1) to the terminal through another specific parameter (=parameter #2) or a specific operation / mode can be replaced with an operation of the terminal indirectly (implicitly) setting / instructing or applying / assuming parameter #1 from the base station through parameter #2 or the above specific operation / mode.

[0151] ● The terminal can understand how LP-WUS / LP-SS is transmitted by pre-configuring or assuming / defining the transmission method of the base station, and can thus receive / monitor LP-WUS / LP-SS in the required time / frequency resources.

[0152] 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.

[0153] A-IoT (Ambient Internet of Things)

[0154] 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.

[0155] 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.

[0156] 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).

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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).

[0163] Implementation example

[0164] Figure 10 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0165] Referring to FIG. 10, 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.

[0166] 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.

[0167] 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 an LP-WUS as described in the present specification. In addition, even if expressed by another name, if the signal is a signal for synchronizing an LP-WUS, it may correspond to an LP-SS as described in the present specification.

[0168] The first receiver corresponds to a separate receiver (i.e., LP-WUR) for receiving LP-WUS, and the second receiver corresponds to a primary receiver (i.e., MR). The second receiver may be a receiver for receiving a paging signal or a control signal for a paging signal. Alternatively, the second receiver may be a receiver capable of receiving a PDCCH. The specific name may be changed from LP-WUR and MR, but the first receiver is designed to consume relatively less power than the second receiver. The primary receiver may be a receiver of an existing NR system, and even if it is a receiver by a communication system other than an NR system, if it is a receiver that is triggered based on the reception of a signal of another receiver that consumes relatively less power, it may correspond to the primary receiver.

[0169] However, in the case of an A-IoT device, only the first receiver among the first and second receivers may be included.

[0170] In addition to the basic operation of FIG. 10, other operations disclosed in this specification may be combined.

[0171] Figure 11 is a flowchart that further concretizes a signal transmission and reception method according to an embodiment of the present invention.

[0172] Referring to FIG. 11, a signal transmission and reception method from a terminal perspective according to an embodiment of the present invention may be configured to include a step of receiving an LP-WUS through a first receiver (S1203), and a step of operating a second receiver based on the reception of the LP-WUS (S1204). A signal transmission and reception method from a base station perspective according to an embodiment of the present invention may be configured to include a step of determining an overlay sequence for the LP-WUS (S1201), and a step of transmitting the LP-WUS based on the determined overlay sequence (S1202).

[0173] Although not shown, the base station can determine an overlay sequence of an LP-SS in addition to an LP-WUS, and transmit the LP-SS to the first receiver of the terminal based on the determined overlay sequence. The terminal can receive the LP-SS through the first receiver, and receive the LP-WUS based on the LP-SS.

[0174] In addition to the operation of FIG. 11, the operations disclosed in Method #1 to Method #3 may be performed.

[0175] For example, as illustrated in Method #2, one overlay sequence can be used per OOK symbol or OFDM symbol of LP-WUS. The overlay sequence is used independently for each symbol. Therefore, the overlay sequence can independently correspond to one or more specific bit values ​​for each symbol. For example, if the number of candidates for the overlay sequence is 2, each candidate corresponds to bit value 0 or 1, and the overlay sequence used for one symbol can express a 1-bit value. If the number of candidates for the overlay sequence is 4, each candidate corresponds to bit value 00, 01, 10, 11, and the overlay sequence used for one symbol can express a 2-bit value. If the number of candidates for the overlay sequence is 2 to the nth power, the overlay sequence used for one symbol can express an n-bit value. If the number of candidates for the overlay sequence is not 2 to the nth power (for example, 2 n -m), the overlay sequence used for one symbol is some of the values ​​that can be represented by n bits (e.g. 2 n It can express values ​​(excluding m values ​​among the dog values).

[0176] When the number of symbols required for a conventional base station to transmit specific information using only OOK modulation via LP-WUS is N, and the bit order of OOK symbols is b_1, b_2, b_3, ..., b_N, and one overlay sequence can express a (a>=1) bit value, the overlay sequence for the earliest OOK symbol in the time domain expresses the first a bits, the overlay sequence for the second OOK symbol in the time domain expresses the next a bits, and so on, so that N / a overlay sequences are configured.

[0177] For example, if a=1, the overlay sequence for the earliest OOK symbol in the time domain represents b_1, the overlay sequence for the second OOK symbol in the time domain represents b_2, and the overlay sequence for the Nth OOK symbol in the time domain represents b_N. If a=3, the overlay sequence for the earliest OOK symbol in the time domain represents {b_1, b_2, b_3}, the overlay sequence for the second OOK symbol in the time domain represents {b_4, b_5, b_6}, and (when N is a multiple of a) the N / ath OOK symbol in the time domain represents {b_n-2, b_n-1, b_N}.

[0178] Meanwhile, referring to method #2, when the bit order of OOK symbols is b_1, b_2, b_3, ..., b_N, the order of overlay sequences in the time domain and the bit order of OOK symbols can be configured differently. For example, if one overlay sequence can express a (a>=1) bit value, the overlay sequence for the earliest OOK symbol in the time domain can express a preset (e.g., consecutive from the k-th bit) a bits, rather than the first a bits.

[0179] As a concrete example, if a = 1, the overlay sequence for the earliest OOK symbol in the time domain represents b_3, the overlay sequence for the second OOK symbol in the time domain represents b_N, and the overlay sequence for the Nth OOK symbol in the time domain represents b_2. Alternatively, the order of the overlay sequences in the time domain and the bit order of the OOK symbols can be configured in reverse order. For example, if a = 1, the overlay sequence for the earliest OOK symbol in the time domain represents b_N, the overlay sequence for the second OOK symbol in the time domain represents b_N-1, and the overlay sequence for the Nth OOK symbol in the time domain represents b_1.

[0180] This is an arbitrary example. Referring to Method #2, the bit order of the overlay sequences can be predefined / set in the base station / terminal. Furthermore, information about the bit order of the overlay sequences can be transmitted from the base station to the terminal. For example, a higher layer parameter or the preamble part illustrated in FIG. 5 can be used as a method for transmitting this information.

[0181] Additionally, referring to Method #1, the LP-WUS can be generated to include M OOK symbols corresponding to one OFDM symbol interval. M can be, for example, 1, 2, or 4. The bit values ​​of the M OOK symbols can be determined based on one of the examples of Alt-1, Alt-2, or Alt-3 of Method #1.

[0182] For example, according to Alt-3 of Method #1, M OOK symbols corresponding to one OFDM symbol interval contain the same bit value.

[0183] Additionally, the preamble part and / or CRC of LP-WUS can be set based on method #3.

[0184] Examples of communication systems to which the present invention is applied

[0185] 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.

[0186] 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.

[0187] Figure 12 illustrates a communication system (1) applied to the present invention.

[0188] Referring to FIG. 12, 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.

[0189] 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).

[0190] 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.

[0191] Examples of wireless devices to which the present invention is applied

[0192] Figure 13 illustrates a wireless device applicable to the present invention.

[0193] Referring to FIG. 13, 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. 12.

[0194] 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.

[0195] 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.

[0196] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] Examples of wireless devices to which the present invention is applied

[0201] Figure 14 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 12).

[0202] Referring to FIG. 14, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 13 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. 13. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 13. 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).

[0203] 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. 12, 100a), a vehicle (Fig. 12, 100b-1, 100b-2), an XR device (Fig. 12, 100c), a portable device (Fig. 12, 100d), a home appliance (Fig. 12, 100e), an IoT device (Fig. 12, 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. 12, 400), a base station (Fig. 12, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0204] In FIG. 14, 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 a set of one or more processors. 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.

[0205] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0206] Figure 15 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.

[0207] Referring to FIG. 15, 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. 14, respectively.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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 based on reception of the LP-WUS; For the N OOK (on off keying) symbols of the above LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol. The N-bit information received through the N overlaid sequences is the same as the N-bit information received through the N OOK symbols, but the bit order of the N-bit information received through the N OOK symbols and the bit order of the N-bit information received through the N overlaid sequences are configured differently in the time domain. method.

2. In paragraph 1, Information about the bit order of the above N overlay sequences is received from the base station, method.

3. In paragraph 2, Information about the bit order of the above N overlay sequences is received through the upper layer parameters. method.

4. In paragraph 2, Information about the bit order of the above N overlay sequences is received through the preamble part of the LP-WUS. method.

5. In paragraph 1, The above LP-WUS is generated to include M OOK symbols corresponding to one OFDM symbol interval, The above M OOK symbols contain the same bit value, method.

6. In a terminal operating in a wireless communication system, First receiver and second receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal based on reception of the LP-WUS; For the N OOK (on off keying) symbols of the above LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol. The N-bit information received through the N overlaid sequences is the same as the N-bit information received through the N OOK symbols, but the bit order of the N-bit information received through the N OOK symbols and the bit order of the N-bit information received through the N overlaid sequences are configured differently in the time domain. Terminal.

7. In paragraph 6, Information about the mapping order of the N OOK symbols and the N overlay sequences is received from the base station. Terminal.

8. In paragraph 7, Information about the above mapping order is received through upper layer parameters. Terminal.

9. In paragraph 7, Information about the above mapping order is received through the preamble part of the LP-WUS. Terminal.

10. In paragraph 6, The above LP-WUS is generated to include M OOK symbols corresponding to one OFDM symbol interval, The above M OOK symbols contain the same bit value, Terminal.

11. In a device for a terminal, at least one processor; and At least one computer memory operably connected to said at least one processor and configured to, when executed, cause said at least one processor to perform operations, said operations comprising: A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal based on reception of the LP-WUS; For the N OOK (on off keying) symbols of the above LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol. A device in which the N-bit information received through the N overlaid sequences is the same as the N-bit information received through the N OOK symbols, but the bit order of the N-bit information received through the N OOK symbols and the bit order of the N-bit information received through the N overlaid sequences are configured differently in the time domain.

12. A computer-readable non-volatile storage medium comprising at least one computer program that causes a terminal including at least one processor to perform an operation, the operation comprising: A step of receiving a LP-WUS (Low Power-Wake Up Signal) through the first receiver of the terminal; and A step of operating a second receiver of the terminal based on reception of the LP-WUS; For the N OOK (on off keying) symbols of the above LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol. The N-bit information received through the N overlaid sequences is the same as the N-bit information received through the N OOK symbols, but the bit order of the N-bit information received through the N OOK symbols and the bit order of the N-bit information received through the N overlaid sequences are configured differently in the time domain. Storage media.

13. In a method performed by a base station in a wireless communication system, A step of determining an override sequence for a LP-WUS (Low Power-Wake Up Signal) for a first receiver of a terminal; A step of transmitting the LP-WUS based on the above overlay sequence; For the N OOK (on off keying) symbols of the above LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol. The N-bit information transmitted through the N overlay sequences is the same as the N-bit information transmitted through the N OOK symbols, but the bit order of the N-bit information transmitted through the N OOK symbols and the bit order of the N-bit information transmitted through the N overlay sequences are configured differently in the time domain. method.

14. In a base station operating in a wireless communication system, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of determining an override sequence for a LP-WUS (Low Power-Wake Up Signal) for a first receiver of a terminal; A step of transmitting the LP-WUS based on the above overlay sequence; For the N OOK (on off keying) symbols of the above LP-WUS, a total of N overlaid sequences are used, one for each OOK symbol. The N-bit information transmitted through the N overlay sequences is the same as the N-bit information transmitted through the N OOK symbols, but the bit order of the N-bit information transmitted through the N OOK symbols and the bit order of the N-bit information transmitted through the N overlay sequences are configured differently in the time domain. Base station.

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