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

Abstract

In relation to transmission / reception of an LP-WUS, an overlaid sequence transmission method and an OOK symbol configuration method are disclosed. Particularly, an overlaid sequence route determination method for generating an overlaid sequence is disclosed. In addition, when the same information is transferred by the overlaid sequence(s) and the OOK, a relationship between a bit order represented by the overlaid sequence(s) and a bit order represented by the OOK is disclosed. Additionally, when the number of OOK symbols in an OFDM symbol allocated for the LP-WUS is different from the number of necessary information bits, a method for configuring the remaining OOK symbols and a method for repeating information bits are disclosed.

Description

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

[0001] This specification relates to methods and devices used in wireless communication systems.

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

[0003] The technical problem to be solved by the present specification is to provide a method for efficiently transmitting and receiving wireless communication signals and an apparatus for doing so.

[0004] The technical challenges are not limited to those described above, and other technical challenges can be inferred from the embodiments.

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

[0006] In one aspect of the present specification, a method is provided comprising: receiving setting information for a signal; receiving the signal based on the setting information; and monitoring a PDCCH (Physical Downlink Control Channel) based on the reception of the signal, wherein the signal is received based on an overlaid sequence(s) on OOK (On-Off Keying) and OON ON symbols, and a first overlaid sequence route and a second overlaid sequence route for generating the overlaid sequence(s) have a predetermined relationship.

[0007] In another aspect of the present specification, a device for performing the method comprises a terminal, a processor, and a storage medium.

[0008] In another aspect of the present specification, a method is provided comprising: transmitting setting information for a signal; transmitting the signal based on the setting information; and transmitting a PDCCH (Physical Downlink Control Channel) based on the transmission of the signal, wherein the signal is transmitted based on an overlaid sequence(s) on OOK (On-Off Keying) and OON ON symbols, and a first overlaid sequence route and a second overlaid sequence route for generating the overlaid sequence(s) have a predetermined relationship.

[0009] In another aspect of the present specification, a base station, a processor, and a storage medium are provided as an apparatus for performing the method.

[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 device.

[0011] The embodiments of this specification described above are merely some of the preferred embodiments of this specification, and various embodiments reflecting the technical features can be derived and understood by those skilled in the art based on the detailed description.

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

[0013] The technical effects are not limited to those described above, and other technical effects may be inferred from the examples.

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

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

[0016] FIG. 3 illustrates a communication procedure between a terminal and a base station applicable to the present disclosure.

[0017] FIGS. 4 to 15 are drawings for explaining a signal transmission and reception method according to an embodiment of the present disclosure.

[0018] FIGS. 16 to 18 illustrate devices according to embodiments of the present disclosure.

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

[0020] For the sake of clarity, the description is based on 3GPP communication systems (e.g., LTE, NR), but the technical scope of this specification is not limited thereto. LTE refers to technology from 3GPP TS 36.xxx Release 8 onwards. Specifically, LTE technology from 3GPP TS 36.xxx Release 10 onwards is referred to as LTE-A, and LTE technology from 3GPP TS 36.xxx Release 13 onwards is referred to as LTE-A pro. 3GPP NR refers to technology from TS 38.xxx Release 15 onwards. LTE / NR may be referred to as a 3GPP system. "xxx" indicates a specific standard document number. LTE / NR may be collectively referred to as a 3GPP system. Regarding background technology, terms, abbreviations, etc. used in the description of this specification, reference may be made to matters described in previously published standard documents. For example, the following documents may be referenced.

[0021] 3GPP NR

[0022] - 38.211: Physical channels and modulation

[0023] - 38.212: Multiplexing and channel coding

[0024] - 38.213: Physical layer procedures for control

[0025] - 38.214: Physical layer procedures for data

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

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

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

[0029] In NR, uplink (UL) and downlink (DL) transmissions consist of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HF). A half-frame is defined as five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots within 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 may include OFDM symbols (or CP-OFDM symbols) or SC-FDMA symbols (or DFT-s-OFDM symbols).

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

[0031] [Table 1]

[0032]

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

[0034] [Table 2]

[0035]

[0036] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be configured differently among multiple cells merged into a single terminal (User Equipment; UE). Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) composed of the same number of symbols can be configured differently among the merged cells.

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

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

[0039] [Table 3]

[0040]

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

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

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

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

[0045] The base station can be, for example, gNodeB.

[0046] 6G network architecture

[0047] FIG. 3 illustrates a communication procedure between a terminal and a base station applicable to the present disclosure. FIG. 3 illustrates the operation of a terminal (100) and a base station (200) transmitting and / or receiving data, and the operation performed prior to this.

[0048] Referring to FIG. 3, in step 101, the terminal (100) and the base station (200) perform synchronization. For example, the terminal (100) performs an initial cell search operation. Specifically, the terminal (100) can detect at least one synchronization signal transmitted from the base station (200) according to a predefined rule. Here, the synchronization signal may include a plurality of synchronization signals (e.g., primary synchronization signal, secondary synchronization signal) classified according to structure or use. Through this, the terminal (100) can identify the boundaries of the frame, subframe, slot, and / or symbol of the base station (200) and obtain information about the base station (200) (e.g., cell identifier).

[0049] In step 103, the terminal (100) obtains system information transmitted from the base station (200). The system information is information related to the attributes, characteristics, and / or capabilities of the base station (200) required to connect to the base station (200) and use the service, and can be classified according to content (e.g., whether it is essential for connection), transmission structure (e.g., channel used, whether it is provided on-demand), etc., and can be classified, for example, into a master information block (MIB) and a system information block (SIB). If necessary, the terminal (100) may transmit a signal requesting the system information prior to receiving the system information. However, the request and provision of the system information may be performed after the random access procedure described later.

[0050] In step 105, the terminal (100) and the base station (200) perform a random access procedure. The terminal (100) may transmit and / or receive at least one message for the random access procedure (e.g., random access preamble, RAR (random access response) message, etc.) based on information related to the random access channel of the base station (200) obtained through system information (e.g., channel location, channel structure, structure of supported preamble, etc.). For example, the terminal (100) may transmit a preamble (e.g., MSG1) through the random access channel, receive a RAR message (e.g., MSG2), transmit a message (e.g., MSG3) containing information related to the terminal (100) (e.g., identification information) to the base station (200) using scheduling information included in the RAR message, and receive a message (e.g., MSG4) for contention resolution and / or connection establishment. As another example, MSG1 and MSG3 can be transmitted and received as a single message, or MSG2 and MSG4 can be transmitted and received as a single message.

[0051] In step 107, the terminal (100) and the base station (200) perform signaling of control information. Here, the control information may be defined in various layers, such as a layer that controls the connection (e.g., a radio resource control (RRC) layer), a layer that handles mapping between logical channels and transmission channels (e.g., a media access control (MAC) layer), and a layer that handles physical channels (e.g., a physical (PHY) layer). For example, the terminal (100) and the base station (200) may perform at least one of signaling to establish a connection, signaling to determine settings related to communication, and signaling to indicate allocated resources.

[0052] In step 109, the terminal (100) and the base station (200) transmit and / or receive data. That is, the terminal (100) and the base station (200) can process, transmit and / or receive data based on the signaling of control information. For example, when transmitting data, the terminal (100) or the base station (200) may perform at least one of channel encoding, rate matching, scrambling, constellation mapping, layer mapping, waveform modulation, antenna mapping, and resource mapping on the information bits. Conversely, when receiving data, the terminal (100) or the base station (200) may perform at least one of signal extraction from resources, antenna-specific waveform demodulation, signal placement considering layer mapping, constellation demapping, descrambling, and channel decoding.

[0053] 6G System Core Technology

[0054] As core implementation technologies for 6G systems, technologies such as artificial intelligence (AI), THz (Terahertz) communication, optical wireless technology, FSO backhaul network, massive MIMO technology, blockchain, 3D networking, quantum communication, unmanned aerial vehicles, cell-free communication, wireless information and energy transfer (WIET), integration of sensing and communication, integration of access backhaul networks, holographic beamforming, big data analysis, and large intelligent surface (LIS) can be adopted.

[0055] LP-WUS

[0056] The contents examined above can be applied in combination with the proposed methods described below, or can be supplemented to clarify the technical characteristics of the proposed methods.

[0057] In addition, the methods described below can be applied in the same way to the NR system (licensed band) or shared spectrum described above, and it goes without saying that the technical concept proposed in this specification can be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so that it can be implemented in the system as well.

[0058] In the Rel-18 NR standard, discussions are underway to introduce LP-WUS (low power wake-up signal) and LP-WUR (low power wake-up receiver or low power wake-up radio), a separate receiver capable of receiving it, as a method for reducing power consumption that differs slightly from the terminal power consumption reduction techniques introduced or supported in Rel-16 / 17 and others. When the receiver within the terminal (the receiver in the downlink) in existing NR systems is referred to as MR (Main radio / receiver), LP-WUR refers to 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 represented as LR.

[0059] LP-WUS is modulated with OOK (On-Off Keying) to align with the slot or symbol structure of the time axis, but can be transmitted without aligning with the RE structure of the frequency axis. LP-WUS is configured to have a signal or no signal within a specific time interval, and the terminal can receive the signal simply by energy detection within that specific time interval. A sequence for spectrum flattening may be superimposed on the OOK symbol of the LP-WUS, or an OFDM sequence for extending transmission coverage or transmitting additional information may be superimposed.

[0060] The following describes the options for LP-WUS waveform generation methods. These can be understood as different methods for MC-OOK (Multi-carrier On-Off Keying) and MC-FSK (Multi-carrier Frequency Shift Keying) waveform generation.

[0061] Figures 4 and 5 show options for the LP-WUS waveform generation method.

[0062] Figures 4 and 5 relate to MC-ASK (amplitude shift keying) waveform generation. In Figures 4 and 5, K is the size of the iFFT (inverse fast Fourier transform) 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.

[0063] Figure 4 shows option OOK-1.

[0064] In option OOK-1, 1 OFDM symbol contains a single bit. For the subcarriers of the LP-WUS, OOK=1 means that all subcarriers are modulated. OOK=0 means that all subcarriers are zero power (from a baseband perspective).

[0065] Figure 5 shows option OOK-4.

[0066] Referring to Fig. 5, in option OOK-4, the 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.

[0067] In FIGS. 4 and 5, the modulated subcarriers may be, for example, QAM (Quadrature Amplitude Modulation) symbols, sequences, or other signals.

[0068] The subcarriers of the potential guard band are zero power (from the baseband perspective). Optionally, of the two additional segments, one can always be modulated and the other can always be transmitted as zero power (from the baseband perspective).

[0069] In addition to OOK-1 and OOK-4, OOK-2 and OOK-3 are available as options.

[0070] Symbols modified in the OOK method may be referred to as OOK symbols. For convenience of writing below, "OOK-1 and / or OOK-4" may be simply denoted as "OOK-1 / 4".

[0071] 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, for OOK-1, 1 bit can be transmitted per OFDM symbol, and for OOK-4, M bits can be transmitted per OFDM symbol. If MC (Manchester encoding) is additionally used in LP-WUS, twice the number of OFDM symbols may be required to transmit the same bit.

[0072] The M OOK (On-Off Keying) or OOK-4 symbols included within a single OFDM symbol interval are signals corresponding to the lengths obtained by dividing the IFFT (Inverse Fast Fourier Transform) output signal into M equal parts. In FIG. 5, the input sequence of the DFT (Discrete Fourier Transform) block and the output sequence of the IFFT block may have a 1:1 mapping relationship. If the DFT input sequence divided into M equal intervals is V(0), ↳, V(M-1), and the IFFT output sequence divided into M equal intervals is S(0), ↳, S(M-1), then a 1:1 mapping relationship is established between V(m) and S(m) (m = 0, ↳, M-1).

[0073] In this specification, S(m) refers to the m-th OOK symbol (or OOK(m)) among the M OOK symbols that constitute a single OFDM symbol. Also, V(m) refers to an overlaid OFDM sequence (which may be expressed as overlaid OFDM sequence, ov-seq, overlaid sequence, or SEQ(m)) mapped to the m-th OOK symbol. The signal value of OOK(m) can be determined according to the value of SEQ(m). For example, if SEQ(m) is a sequence with all zero values, OOK(m) becomes an 'OOK OFF symbol' having zero energy. On the other hand, if SEQ(m) consists of non-zero values, OOK(m) becomes an 'OOK ON symbol' which is a waveform having a specific energy.

[0074] A Low-Power Wake-Up Receiver (LR) receiving an OOK signal performs Energy Detection (ED) to measure the energy of each OOK symbol and compares the measured value with a specific reference value to determine whether it is an OOK ON symbol or an OOK OFF symbol. Specifically, the LP-WUR determines that bit '1' has been transmitted if the ED result is an OOK ON symbol, and determines that bit '0' has been transmitted if the ED result is an OOK OFF symbol. Therefore, 1 bit of information can be transmitted through a single OOK symbol.

[0075] Meanwhile, using SEQ(m) allows for the transmission of additional information separate from the OOK symbol. This is because the ED result can be the same even if the waveforms differ as they are generated from different sequences. For example, if a transmitting device intends to transmit K bits of additional information via SEQ(m), it can use one sequence selected from a set of 2^K candidate sequences as SEQ(m). The LR of the receiving device recovers the K bits of information by detecting the corresponding sequence.

[0076] For convenience of explanation in this specification, the above-described process may be expressed as ‘transmitting 1 bit through OOK(m)’ or ‘transmitting K bits through SEQ(m).’ Additionally, since SEQ(m) is a sequence used to generate OOK(m), it may be expressed as ‘SEQ(m) is transmitted together with OOK(m).’

[0077] Meanwhile, a terminal (including an LP-WUR) that receives the LP-WUS can perform an action to wake up the MR; to do this, an ID (identifier) ​​capable of distinguishing each terminal or a (sub)group of terminals may be included in the LP-WUS signal. The UE ID may use (for example) a 5G-S-TMSI value or a value reduced by modulo operation. Depending on the ID used, this value may be approximately 48 bits. Accordingly, a considerable number of OFDM symbols may be used to transmit the 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. If the part containing information such as the UE ID is referred to as the message part of the LP-WUS, and a preamble part to assist in receiving the message part is transmitted along with it, the number of required OFDM symbols may increase. The preamble part can convey information necessary for detecting / decoding the message part in LR. Figure 6 shows an example of an LP-WUS transmission including a preamble part and a message part.

[0078] If an LP-WUS signal transmitted to a specific terminal (or group of terminals) occupies a specific (frequency / time) channel for longer than a certain period, it can result in inefficient resource usage for both the network and the terminal. From a reception perspective, the LP-WUS signal may be vulnerable to interference. Furthermore, if accurate time synchronization is not ensured, the LR may have to attempt monitoring for a duration longer than the actual length of the LP-WUS signal. When the LP-WUS signal consists of a preamble part and a message part, effective signal configuration and setting methods are required for this purpose.

[0079] Meanwhile, an overlaid sequence may be used in conjunction with the OOK waveform of the LP-WUS signal. 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 information is transmitted through the overlaid sequence, this may serve as 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 possessing Fast Fourier Transform (FFT) and / or frequency domain sequence correlation capabilities can receive the overlaid sequence. Even if the sequence is overlaid on each OOK symbol or OFDM symbol in the time domain, only LP-WUSes possessing time domain sequence correlation capabilities can receive the sequence. Since the LP-WUR of the lowest complexity may only distinguish between ON / OFF of OOK symbols, the overlaid sequence needs to be designed to take these various types of LP-WURs into account.

[0080] Meanwhile, a separate LP-SS (low power synchronization signal) may be defined and transmitted for time / frequency synchronization 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 overlaid sequence may be applied. The LP-SS may be a signal transmitted periodically or aperiodisically. 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.

[0081] 1. Method for transmitting an overlaid sequence for LP-WUS information repetition

[0082] LP-WUR can detect LP-WUS asynchronously and acquires information using an Energy Detection (ED) method that utilizes the characteristics of the OOK (On-Off Keying) signal. Due to the characteristics of this asynchronous detection and energy detection method, the service radius in which LP-WUR can reliably receive LP-WUS may be relatively limited compared to the downlink (DL) signal of conventional NR. To extend the service radius of LP-WUS and improve reception performance, repetitive transmission may be introduced.

[0083] When an N-bit information sequence transmitted through LP-WUS is denoted as [b(0), b(1), ↳, b(N-1)], the repetitive transmission method can be classified into bit-level, symbol-level, block-level, and chip-level repetitions depending on the unit to which repetition is applied. The following describes each method assuming two repetitive transmissions, but this can be extended to any number of times (K times).

[0084] - Bit-level Repetition: Bit-level repetition is a method of generating an LP-WUS bit stream by continuously repeating individual information bits b(k$). For example, if 2 repetitions are applied to an information sequence [b(0), b(1), ..., b(N-1)], the generated bit stream takes the form [b(0), b(0), b(1), b(1), ..., b(N-1), b(N-1)].

[0085] - Symbol-level Repetition: Symbol-level repetition is a method of transmitting OFDM symbols with mapped information bits repeatedly. Assuming the OOK-4 scheme with M=2, without repeated transmission, [b(0), b(1)] is mapped to the first OFDM symbol and [b(2), b(3)] is mapped to the second OFDM symbol, using a total of N / 2 OFDM symbols. On the other hand, when symbol-level repetition is applied, [b(0), b(1)] is transmitted identically in the first and second OFDM symbols, and [b(2), b(3)] is transmitted identically in the third and fourth OFDM symbols, using a total of N OFDM symbols.

[0086] - Block-level Repetition: Block-level repetition is a method of generating a bit stream by repeating an entire LP-WUS information block consisting of N bits as a unit. When block-level repetition is applied to the information sequence [b(0), b(1), ..., b(N-1)], the bit stream is configured in the form [b(0), b(1), ..., b(N-1), b(0), b(1), ..., b(N-1)] so that the entire sequence follows immediately.

[0087] - Chip-level Repetition: Chip-level repetition is a method of performing repetition at the level of OOK symbols (chips), which are the smallest units constituting the LP-WUS signal. In the absence of Manchester encoding, the physical waveform may be identical to that of bit-level repetition. However, in an environment where Manchester encoding is applied at the information bit level, bit-level repetition repeats the bits prior to encoding, whereas chip-level repetition repeats the encoded result, the OOK symbols; thus, different resulting signals may be produced.

[0088] When OOK symbols are transmitted repeatedly, the LP-WUR receiving the signal can improve detection performance by performing energy detection individually for each OOK symbol or by performing ED by merging the repeated symbols (e.g., weighted summation or averaging). Meanwhile, an overlay OFDM sequence can be transmitted for each OOK symbol. If the same overlay sequence is transmitted repeatedly according to the repetition of the same OOK symbol, the LR can improve decoding performance for the overlay sequence by decoding the overlay sequence for each OOK symbol or by merging OOK symbols. However, the power consumption of the LR increases proportionally to the number of repetitions.

[0089] Generally, information detection performance through an overlaid sequence is superior to that of a simple ED method, but the power required for sequence decoding is greater than the power required for monitoring and decoding the OOK signal. Considering this trade-off between performance and power efficiency, even if the OOK symbol is repeated, it may not necessarily be necessary to repeat the overlaid sequence combined with it.

[0090] In conclusion, OOK symbol-based information transmission and overlaid sequence-based information transmission can target different types of LR. Given that the reception performance and power consumption characteristics of the two methods differ, it is reasonable from a system operation perspective to transmit OOK symbols repeatedly but not overlaid sequences.

[0091] Meanwhile, depending on the structure of the LR receiver, since ED detection of the OOK symbol does not require phase information, it may be possible to receive and decode the signal through a single branch (e.g., I-branch only) within the receiver. On the other hand, since the overlaid sequence requires phase information for decoding, the signal may be received and decoded using a double branch (e.g., including both I-branch and Q-branch). An LR capable of decoding the overlaid sequence can also perform ED detection of the OOK signal by utilizing some configuration of the receiver module.

[0092] If the LR can decode both the OOK symbol and the overlaid sequence, the information bits transmitted through the LP-WUS can be separated into two parts, some of which are transmitted through the OOK symbol and the other part through the overlaid sequence transmitted along with the OOK symbol. In this case, the receiver can detect the full information of the LP-WUS even if it receives only some of the OOK symbols. Considering this, even in an environment where OOK symbols are transmitted repeatedly, the LP-WUS monitoring time, decoding time, complexity, and power consumption of the LP-WUR can be effectively reduced by appropriately adjusting the order of the transmission bits of the overlaid sequence transmitted along with them.

[0093] Below, a method for transmitting information using an overlaid sequence when repeatedly transmitting OOK symbols is described.

[0094] Unless otherwise noted in the following description, it is assumed that each OOK symbol constituting the LP-WUS transmits 1 bit of information. For example, the OOK ON symbol can transmit bit '1', and the OOK OFF symbol can transmit bit '0'. However, the proposed method described below can be applied in the same way to methods transmitting 2 bits or more of information per OOK symbol within the scope of maintaining the technical principles of the present invention.

[0095] In addition, unless otherwise noted, it is assumed that the information bits transmitted through the OOK symbol of the LP-WUS are transmitted identically through the overlaid sequence transmitted along with the OOK symbol. For example, when an N-bit information stream [b(0), ..., b(N-1)] is transmitted, the n-th OOK symbol and the n-th overlaid sequence mapped thereto may both contain the same information b(n) (n=0, ..., N-1). However, even if the information transmitted through the overlaid sequence and the information transmitted through the OOK symbol are different from each other, the same method may be applied to the extent that the proposed principle of the present invention is not compromised.

[0096] An overlaid sequence can be transmitted as an independent sequence for each OOK symbol. For example, two consecutive OOK symbols may be used for 2-bit transmission, and an independent sequence may be combined for each OOK symbol. Each sequence may be one sequence selected from a set of 2^K candidate sequences, and LR detects K bits of information by decoding the sequence or analyzing the correlation. For example, if one of two different sequences is selected and transmitted for each OOK symbol, the overlaid sequence for each OOK symbol may contain 1 bit of information. Or, if one of four different sequences is selected and transmitted for each OOK symbol, the overlaid sequence for each OOK symbol may contain 2 bits of information. In addition, within the scope of maintaining the principles of the present invention, the overlaid sequence may mean a case where an independent sequence is configured in units of two or more OOK symbols, or a case where an independent sequence is transmitted in units of a part of the OOK symbol (e.g., the first or second half of the symbol length).

[0097] Meanwhile, the following description uses an environment where Manchester coding is applied as an example, but the proposed method of the present invention can be applied in the same way even when coding is not applied.

[0098] In the present invention, 'LP-WUS information' or 'information bits' refers to information transmitted by a base station to a specific terminal or terminal group via LP-WUS. This may be a identifier identifying a terminal or terminal group, or cell information, etc. Additionally, if a Cyclic Redundancy Check (CRC) is set, the information may or may not include the CRC. Furthermore, the expression of repeatedly transmitting information bits may mean repeating the entire content including the CRC, or repeating only the data portion excluding the CRC.

[0099] In the proposals of this specification below, unless otherwise noted, LP-WUS and / or LP-SS are assumed to be signals modulated by MC-OOK (Multi-Carrier On-Off Keying, OOK signals generated using an OFDM structure or multiple subcarriers or frequency tones). However, the methods and configuration methods proposed in this invention may be applied in the same way even when MC-FSK signals, OFDM-based signals, or single-tone signals are used as LP-WUS.

[0100] The proposed methods below are described based on LP-WUS and / or LP-SS for convenience of explanation, but LP-WUS or LP-SS in the proposed and configured methods can be replaced with general OFDM-based signals (e.g., NR signals / channels) as well as signals / channels using MC-OOK and applied in the same way.

[0101] In the proposal below, the term "occasion" may refer to a transmission occasion (TO) where the base station transmits a signal, or a monitoring occasion (MO) where the receiver (such as an LP-WUR) monitors the signal, depending on the context. Since TO signifies 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). Since MO signifies an opportunity to monitor the signal, the receiver may not monitor the signal at that location (depending on the configuration or the needs / situations of the base station / terminal). Additionally, for the sake of convenience, even if expressed simply as MO or TO, MO, TO, or MO and TO may be indicated depending on the proposed method and context.

[0102] In the proposal below, setting the opportunity for LP-SS / LP-WUS can be interpreted as setting one or more of the period, starting time, ending time, duration, offset within the period, and the frequency at which the corresponding signal is transmitted.

[0103] In various examples of the present disclosure, " / " and "," should be interpreted as indicating "and / or." For example, "A / B" may mean "A and / or B." Furthermore, "A, B" may mean "A and / or B." Furthermore, "A / B / C" may mean "at least one of A, B and / or C." Furthermore, "A, B, C" may mean "at least one of A, B and / or C."

[0104] In addition, embodiments of the present invention are described assuming that LP-SS is transmitted periodically unless otherwise noted. However, the method and setting method proposed in the present invention can be applied equally to LP-SS that is transmitted non-periodically.

[0105] Unless otherwise noted in the following proposal, it is assumed that while receiving LP-WUS or LP-SS, the MR capable of receiving conventional NR signals or channels is in a sleep state, and the terminal monitors the LP-WUS and / or LP-SS through a separate receiver, LR. However, each method may be applied in the same way even if the MR is not in a sleep state during the period of monitoring the LP-WUS and / or LP-SS.

[0106] When transmitting LP-WUS, if 1 bit can be transmitted independently for each OOK symbol, N OOK symbols (OOK(0), ..., OOK(N-1)) can be used to transmit an N-bit stream [b(0), ..., b(N-1)]. Information bit b(n) can be transmitted through OOK(n) (n=0, ..., N-1). An overlaid sequence can be transmitted along with each OOK symbol, and when 1 bit is transmitted through the OOK symbol, K bits of additional information can be transmitted along with the overlaid sequence.

[0107] [Method #1] Method for transmitting an overlaid sequence of repeatedly transmitted OOK symbols when 1 bit is transmitted for each OOK symbol through an overlaid sequence

[0108] Assume the case where K=1, that is, 1 bit is transmitted via OOK(n) and a separate 1 bit is also transmitted via SEQ(n), and the total N bit streams transmitted to the LP-WUS are [b(0), ..., b(N-1)]. If each OOK symbol and the overlaid sequence associated with that symbol contain the same information, then b(n) is transmitted via OOK(n) and the same b(n) is transmitted via SEQ(n). In this case, the LR must continue the sequence detection operation for the duration of N OOK symbol intervals to receive all bits.

[0109] On the other hand, when n has a value from 0 to N-1, b(n) can be transmitted via OOK(n) and b(Nn-1) can be transmitted via SEQ(n). In this case, an LP-WUR capable of receiving and decoding both the OOK signal and the overlaid sequence can detect all of the information [b(0), ..., b(N-1)], which is the total N bits of information, even if it receives and decodes only N / 2 OOK symbols, which is half of the total N symbol interval. Through this, the LP-WUS monitoring time is reduced by half, and the power consumption of the LP-WUR can also be reduced proportionally. Since the monitoring time is reduced compared to the case where all N OOK symbols are received, the effect of waking up the MR faster can be achieved. By setting the bit order transmitted through the overlaid sequence to be different from the bit order of the OOK symbols, it is possible to shorten the monitoring time, reduce power consumption, and shorten the wake-up time of the main radio.

[0110] The bit order of an overlaid sequence can be determined by one of the following three methods or a combination thereof.

[0111] According to Method 1-A (reversed bit order), the bit order of the overlaid sequence can be set in reverse order of the bit order of the OOK symbol. For example, when b(n) is transmitted through OOK(n), it can be configured so that b(Nn-1) is transmitted through SEQ(n).

[0112] According to Method 1-B (shifted bit order), the bit order of the overlaid sequence can be determined by the cyclic shift of the bit order of the OOK symbols. When a shift of L bits is applied, b(n) can be transmitted via OOK(n) and b((nL) modulo N) can be transmitted via SEQ(n). Here, the modulo operation refers to an operation that yields the remainder of dividing n+L or nL by N. As a specific example, when a 1-bit shift is applied, SEQ(n) can be composed of b((n+1) modulo N) or b((n-1) modulo N), and when an N / 2-bit shift is applied, SEQ(n) can be composed of b((n + N / 2) modulo N) or b((n - N / 2) modulo N).

[0113] According to Method 1-C (hybrid bit order), the bit order can be determined by combining Method A and Method B. This means that the order in which the bit order of the OOK symbol is rearranged in reverse order and then cyclically shifted by a certain number of bits is used for the transmission of the overlaid sequence.

[0114] When OOK symbols are repeatedly transmitted, overlaid sequences can also be repeatedly transmitted independently, which can reduce the time required for LP-WUS monitoring.

[0115] Specifically, in an environment where the OOK symbol is bit-level repeated, the bit order of the overlaid sequence can be determined based on bit-level repetition, symbol-level repetition, or block-level repetition.

[0116] FIG. 7 is a diagram illustrating an example of bit mapping and overlaid sequence operation according to a repeating transmission method in one embodiment. In FIG. 7, it is assumed that the information bits transmitted through the LP-WUS are [a, b, c, d], and a signal configuration with an OOK-4 structure with M=2 and Manchester coding (MC) applied is exemplified.

[0117] Referring to the bit-level repetition scenario of FIG. 7, information bits [a, b, c, d] are each repeated twice, forming a bit stream of [a, a, b, b, c, c, d, d] over a total of 8 OFDM symbol intervals. Rows OOK duration (w / MC) and ON / OFF symbol (w / MC) indicate the state of each bit transmitted through the OOK symbol pair to which MC is applied, and the corresponding OOK ON symbol or OOK OFF symbol. Rows 'Opt1 (bit-R)', 'Opt2 (OS-R)', and 'Opt3 (WUS-R)' indicate, in order, that the bits of the overlaid sequence are repeated at the bit level, symbol level, or block level.

[0118] At this time, various options can be considered for the bit configuration of the overlaid sequence. When the overlaid sequence follows the same bit-level repetition as the OOK symbol, such as in row Opt1 (bit-R), the bit order transmitted through the overlaid sequence is set to [a, a, b, b, c, c, d, d]. In this configuration, even if a receiver capable of decoding both the OOK symbol and the overlaid sequence is capable of decoding both, the entire 8 OFDM symbol interval must be received to detect the entire information.

[0119] On the other hand, when block-level repetition is applied to the overlaid sequence, such as in row Opt3 (WUS-R), the bit order of the overlaid sequence can be configured as [a, b, c, d, a, b, c, d]. In this case, while the information bits are repeated through the OOK symbol, the entire information block is transmitted sequentially as [a, b, c, d] through the overlaid sequence. Therefore, a receiver capable of decoding both the OOK symbol and the overlaid sequence can detect all of [a, b, c, d] even if it receives only the first four OFDM symbols out of the total eight symbol intervals.

[0120] In addition, FIG. 7 shows that the monitoring time of the receiver can be optimized by adjusting the bit order of the overlaid sequence even in the environment of symbol-level repetition and block-level repetition of the OOK symbol. As a result, by operating the OOK symbol repetition transmission method and the bit order of the overlaid sequence differently, the LP-WUS monitoring time can be shortened and the power consumption of the receiver can also be reduced.

[0121] By applying a reversed bit order, a shifted bit order, or a hybrid bit order according to methods 1-A, 1-B, and 1-C, the LP-WUS monitoring time can be further reduced. FIG. 8 illustrates the result of incorporating a bit order shift or bit order reverse method into the bit order of an overlaid sequence for a signal configuration to which bit-level repetition is applied.

[0122] Specifically, Opt1.shift, Opt2.shift, and Opt3.shift represent configurations in which the bit order of the overlaid sequence is cyclically shifted by N / 2, with the bit order shift method applied to bit-level, symbol-level, and block-level iteration schemes, respectively. Additionally, Opt1.reverse, Opt2.reverse, and Opt3.reverse represent configurations in which the bit order of the overlaid sequence is changed as the bit order inversion method is applied to the respective schemes.

[0123] Referring to FIG. 8, when any one of the six disclosed methods is adopted, only three OFDM symbols can be received and processed to detect all of the entire information bits [a, b, c, d]. In this way, if the receiving side acquires the entire information using only the first three OFDM symbol segments, LP-WUS monitoring for the subsequent segments can be stopped early.

[0124] FIG. 9 illustrates various repetition and bit order operations of an overlaid sequence in an environment where OOK symbols are transmitted via block-level repetition. Referring to FIG. 9, the overlaid sequence may be transmitted repeatedly based on any one of bits, symbols, and / or block levels, and additionally, for each repetition method, the results of cyclically shifting or reversing the bit order by N / 2 are exemplified sequentially from the top of FIG. 9.

[0125] In particular, by referring to Opt2.shift, Opt2.reverse, and Opt3.reverse in Fig. 9, it can be confirmed that only two OFDM symbol intervals are required to detect all information bits [a, b, c, d]. This is because, as the information transmitted through the OOK symbol and the information transmitted through the overlaid sequence are arranged complementarily, the entire bit stream can be recovered early without receiving the entire signal interval.

[0126] In this way, when the OOK symbol is repeatedly transmitted in bit, symbol, or block units, the overlaid sequence can also be repeatedly transmitted in bit, symbol, or block units independently of the OOK repetition method. Additionally, the LP-WUS monitoring time can be effectively reduced by reversing or shifting the bit order of the overlaid sequence.

[0127] The base station may set or instruct the terminal that the bit order of the OOK symbol and the overlaid sequence is transmitted through one or more of the various combinations described above. Additionally, the terminal may report to the base station one or more preferred methods among these combinations.

[0128] The above-described method can be applied to an LP-WUR capable of receiving and decoding an overlaid sequence, and can be used for the purpose of reducing the LP-WUS monitoring time, reducing the power consumption of the LP-WUR, or reducing the wake-up time of the main radio (MR) through the LP-WUS. The method can be applied not only to an LP-WUR terminal capable of simultaneously performing overlaid sequence decoding and OOK symbol detection, but also to an LP-WUR terminal that performs only overlaid sequence decoding.

[0129] Although the above description was written using the case where M is 2 as an example, Method 1 can be generalized and applied regardless of the value of M.

[0130] Method 1 was described as a configuration in which 1 bit is transmitted through an overlaid sequence under the assumption that 1 bit is transmitted per OOK symbol, but this is merely illustrative. In general, when a specific number of bits is transmitted per OOK symbol, the technical concept of the present invention can be equally applied to all configurations in which the same number of bits is transmitted through an overlaid sequence.

[0131] When an OOK symbol is transmitted repeatedly, phase rotation, cyclic shift (CS) hopping, or frequency hopping may be additionally applied to the overlaid sequence transmitted in conjunction with the OOK symbol. Additionally, phase rotation, CS hopping, or frequency hopping may be applied individually or in combination to the repeated transmission sequence of the overlaid sequence itself.

[0132] Specifically, when information bit b(k) is repeatedly transmitted through an OOK symbol or an overlaid sequence, a waveform with a phase rotated or a CS or frequency hopping form may be applied in subsequent repeated transmission periods compared to the initial transmission period. In this case, CS hopping may mean, for example, using a set of cyclic shifts {0, 3, 6, 9} with an interval of 3, and then changing to another set {1, 4, 7, 10} that maintains the same interval. CS hopping may mean that the initial cyclic shift (initial CS) value changes according to a specific time unit or transmission unit.

[0133] [Method #2] Method for transmitting an overlaid sequence of repeatedly transmitted OOK symbols when 2 or more bits are transmitted via an overlaid sequence for each OOK symbol

[0134] As described above, in order for K bits to be transmitted through an overlaid sequence, one of 2^K candidate sequence sets must be selected and transmitted. Accordingly, LR may attempt to decode all 2^K candidate sets to detect the corresponding sequence. If the OOK symbol is configured to be transmitted repeatedly, the number of decoding attempts by LP-WUR can be reduced by adjusting the number of bits transmitted through the overlaid sequence.

[0135] For example, a situation may be assumed in which bit-level repetition is applied to an OOK symbol and 2 bits are transmitted through an overlaid sequence. FIG. 10 illustrates an example in which bit-level repetition is applied to an OOK symbol transmitting an information bit stream [a, b, c, d]. Referring to FIG. 10, a configuration in which bit, symbol, or block-level repetition is applied to an overlaid sequence, and a configuration in which the bit order is reversed based on this repetition method are exemplified.

[0136] When an LP-WUS configured and transmitted as shown in Fig. 10 is received, the LR can perform a process of checking all four sequence candidate groups for each OOK symbol to decode the overlaid sequence.

[0137] Meanwhile, when the OOK symbol is transmitted repeatedly, the number of bits transmitted through the overlaid sequence can be reduced from 2 bits to 1 bit, as shown in FIG. 11. In this case, since the LR attempts to decode only two sequence candidates, receiver complexity is reduced and power consumption due to sequence decoding can also be reduced. Additionally, the Hamming distance between sequence candidates can be increased when two sequences are used compared to when four sequences are used, which can improve reception detection performance.

[0138] Comparing the two cases of FIGS. 10 and FIGS. 11, it can be confirmed that there is a trade-off relationship between the data transmission rate of bits transmitted through the overlaid sequence, the degree to which information is repeatedly transmitted through the overlaid sequence, and the power consumption of the receiver. In order to allow this relationship to be flexibly adjusted, the base station may set or instruct the terminal that the bit sequence of the OOK symbol and the overlaid sequence may be transmitted through one or more of the combinations described above. Additionally, the terminal may report to the base station a preferred method among one or more of these combinations.

[0139] Method 2 can be applied to an LR capable of receiving and decoding an overlaid sequence to reduce the LP-WUS monitoring time, reduce the power consumption of the LP-WUR, or reduce the wake-up time of the main radio (MR) through the LP-WUS. Additionally, Method 2 can be applied to both an LP-WUR terminal capable of simultaneously performing overlaid sequence decoding and OOK symbol detection, and an LP-WUR terminal capable of performing only overlaid sequence decoding.

[0140] As another method to reduce the decoding complexity of LR, a method may be proposed to lower the sequence decoding rate of LP-WUR by changing the length of the overlaid sequence when the repeated transmission of OOK symbols is set. As shown in FIG. 12, the operation of detecting 1 bit for each individual OOK symbol (or OFDM symbol) can be changed and set to an operation of detecting a longer overlaid sequence that transmits 2 bits for every 2 OOK symbols (or OFDM symbols), such as Opt1b to Opt3b.

[0141] Additionally, as illustrated in the last line (Opt) of FIG. 12, a method of using a longer overlaid sequence and a method of reducing the number of bits transmitted through said sequence may be applied simultaneously. This method of changing the transmission of the overlaid sequence can be utilized when the sequence decoding performance of the LP-WUR is good or the service radius is sufficiently wide, or when the terminal is located in the center of the cell and the reception environment of the LP-WUS is good.

[0142] Method 2 was described using an example where 2 or more bits are transmitted through an overlaid sequence under the assumption that 1 bit is transmitted per OOK symbol, but this can be generalized and applied. When a specific number of bits is transmitted per OOK symbol, the technical concept of the present invention can be applied equally to all configurations where a number of bits greater than the specific number of bits is transmitted through an overlaid sequence.

[0143] When an OOK symbol is transmitted repeatedly, phase rotation, cyclic shift (CS) hopping, or frequency hopping may be additionally applied to the overlaid sequence transmitted along with the OOK symbol. Additionally, phase rotation, CS hopping, or frequency hopping may be applied individually or in combination to the repeated transmission of the overlaid sequence itself.

[0144] That is, when information bit b(k) is repeatedly transmitted through the OOK symbol or overlaid sequence described in this proposal, a signal in which the phase is rotated or the CS or frequency is hopping may be applied in subsequent transmission sections compared to the initial transmission section. In this case, CS hopping may mean, for example, a method of using a cyclic shift set {0, 3, 6, 9} with an interval of 3 and then changing to another set {1, 4, 7, 10} that maintains the same interval. CS hopping may mean that the initial cyclic shift (initial CS) value is changed according to a specific time unit or transmission unit.

[0145] [Method #3] How to set the root value of a ZC sequence

[0146] When a ZC (Zadoff-Chu) sequence is used as an overlay sequence for LP-WUS, the auto-correlation performance of the sequence and the cross-correlation performance among multiple candidate sequences may be affected depending on the setting of the root value of the ZC sequence. In addition, since sequence decoding in LR is a power-consuming operation, it is necessary to set the ZC sequence in a way that can reduce the decoding burden on the terminal. Below, a method for setting the root value is proposed to secure sequence detection performance and reduce the decoding complexity of LP-WUR.

[0147] Method 3-1: To utilize the low cross-correlation characteristics of ZC sequences, the difference between the root values ​​of different overlaid sequences can be set to be relatively prime to the sequence length. That is, when the root values ​​of two overlaid sequences are denoted as q1 and q2, the difference between q1 and q2, |q1-q2|, can be set to be relatively prime to the corresponding sequence length. If ZC sequences with four different root values ​​are to be set as a set of candidate overlaid sequences, the difference between any two root values ​​q_i and q_j, |q_i - q_j|, can be set to be relatively prime to the sequence length. For example, if the sequence length is a power of 2 and two ZC sequences are used to transmit 1 bit through the overlaid sequence, the two root values ​​q1 and q2 can be set such that their difference, |q1-q2|, is odd. As another example, if the sequence length is a power of 2 and a set of 4 candidate sequences for 2-bit transmission is configured, 2 roots are set so that their difference is odd as described above, and the remaining 2 sequences can be set as sequences obtained by cyclic shifting the ZC sequences with roots q1 and q2 by a specific value.

[0148] Method 3-2: To maintain the low processing complexity of LR and reduce power consumption, the root values ​​can be set such that different overlaid sequences become ZC sequence pairs that have a complex conjugate relationship. If one of two overlaid sequences needs to be identified in LR, a correlation check must generally be performed on both sequences. However, if the two sequences are complex conjugates to each other, LP-WUR can distinguish between the two sequences with only a correlation operation on one sequence, which can contribute to reducing the complexity of the receiver implementation. Specifically, the two root values ​​q1 and q2 can be set such that q1 + q2 is equal to the sequence length. Additionally, if four root values ​​q1, q2, q3, and q4 are used, q1 + q2 and q3 + q4 can each be set such that they are equal to the sequence length.

[0149] As described above, when the root values ​​of multiple overlaid sequences are determined as interrelated values, only one root value may be explicitly set to reduce the signaling overhead of the base station. In this case, the remaining root values ​​may be determined by adding a specific predefined offset value or according to a mapping relationship separately established through RRC (Radio Resource Control), etc.

[0150] 2. Method for Determining Symbol Length for Information Repetition in LP-WUS

[0151] LP-WUS can be detected asynchronously. Each OOK symbol received via LR can be decoded into bit 0 or bit 1 through energy detection. Through the detection of one or more OOK symbols, a distinguisher for a terminal or terminal group for a wake-up indication can be detected. The distinguisher can be determined by the number of terminals or terminal groups supporting LP-WUS operation or by a separate setting. For example, if a base station transmits an LP-WUS that distinguishes up to 32 terminal groups, 5 bits of information can be transmitted through the LP-WUS.

[0152] When N bits of information transmitted through LP-WUS are denoted as [b(0), ..., b(N-1)], the stream [b(0), ..., b(N-1)] may not coincide with the boundaries of the OFDM symbol depending on the value M, which is the number of OOK symbols constituting one OFDM symbol, and the value N, which is the length of the information. FIG. 13 illustrates an example of this situation where M is 4 and N is 5. Referring to FIG. 13, the bit stream [b(0), b(1), b(2), b(3)] is transmitted one bit each through the four OOK symbols constituting the first OFDM symbol, and the remaining b(4) is transmitted through the second OFDM symbol. At this time, since the second OFDM symbol is also composed of M=4 OOK symbols, the bit stream within the symbol can be configured in the form of [b(4), X1, X2, X3]. Accordingly, a definition is required regarding how the above X1, X2, and X3 will be specifically configured.

[0153] Since X1 to X3 above do not correspond to valid information such as terminal or terminal group identifiers transmitted through LP-WUS, they may be filled with arbitrary values ​​or not received by LP-WUR. However, in this case, the frequency characteristics of the OFDM symbol containing valid information may change, and it may also affect the power and detection of the OOK symbol transmitting b(4), which is valid information.

[0154] In the present invention, a method is proposed for setting or transmitting OOK symbols when some of the OOK symbols among the OFDM symbols required for LP-WUS transmission are not filled with valid information. As shown in the example of FIG. 13, when an LP-WUS transmitting bits with N = 5 is transmitted through two OFDM symbols with K = 2, a total of 8 OOK symbols are used (provided the condition M*K >= N is satisfied). At this time, a method is provided for configuring the remaining 3 OOK symbols excluding the OOK symbol to which N bits are allocated. More generally, a method is proposed for configuring the remaining OFDM symbols or OOK symbols after all LP-WUS information bits have been allocated for a single LP-WUS transmission. In the following description, the remaining OFDM symbols or OOK symbols after all LP-WUS information bits have been allocated for a single LP-WUS transmission may be represented as tail symbols. In addition, the process of filling tail symbols can be expressed using terms such as OOK extension or OFDM symbol alignment.

[0155] In the proposal below, when an OOK symbol is repeatedly transmitted, phase rotation, cyclic shift (CS) hopping, or frequency hopping may be additionally applied to the overlaid sequence transmitted along with the OOK symbol. Additionally, phase rotation, CS hopping, or frequency hopping may be applied individually or in combination to the repeated transmission of the overlaid sequence itself.

[0156] According to the present proposal, when bit b(k) is used for repeated transmission through an OOK symbol or an overlaid sequence, a signal with a phase rotated or a CS or frequency hopping form may be applied in subsequent repeated transmission sections compared to the initial transmission section. In this case, CS hopping may be assumed, for example, by using a set of cyclic shifts {0, 3, 6, 9} with an interval of 3 and then changing to another set {1, 4, 7, 10} with the same interval. CS hopping may mean that the initial cyclic shift (initial CS) value is changed at specific time units.

[0157] [Method #4] OOK Extension Method for OFDM Symbol Alignment

[0158] When an LP-WUS is transmitted via multiple OFDM symbols, it is desirable for each OFDM symbol to be transmitted with the same power on average. If power uniformity is not guaranteed, the operational complexity of the receiver (LR) may increase. For example, abrupt changes may occur in the receiver's Automatic Gain Control (AGC), which may make it difficult to receive a normal signal during the time it takes for the AGC to stabilize. Additionally, the receiver performing energy detection of the OOK signal must determine a threshold to distinguish between ON and OFF signals. If there is a large power deviation between OFDM symbols, additional complexity may arise in the process of determining this threshold. Furthermore, even if the average power of each OFDM symbol is the same, the aforementioned problems may occur if the power of the individual OOK symbols constituting it is not uniform. To prevent these problems, an effective OOK extension method is required.

[0159] A base station may configure an LP-WUS signal by applying one or more of the following OOK extension methods, and a terminal may receive the LP-WUS by recognizing or receiving an LP-WUS tail symbol configuration as follows.

[0160] Opt1 (All-zero extension): A method can be applied where all tail symbols consist of '0', i.e., OOK OFF symbols. If Manchester encoding is applied to the LP-WUS, the tail symbols can be composed of a pair of two OOK symbols representing '0'. Through this, the receiver can infer the size of the information bit, and if necessary, through separate settings, the effect of lowering the power of the tail symbols and increasing the power of other OOK symbols can be achieved.

[0161] Opt2 (All-one extension): A method can be applied where the tail symbols consist entirely of '1', i.e., OOK ON symbols. When Manchester encoding is applied, the tail symbols can be composed of a pair of two OOK symbols representing '1'. Through this, the receiver can not only infer the size of the information bits but also utilize multiple '1' signals to perform AGC adjustment or use them for ED threshold adjustment.

[0162] Opt3 (Cyclic extension): Tail symbols can be composed of cyclic repetitions of information bits. This is a method in which the first bit of the LP-WUS information bit is transmitted in the first OOK symbol of the tail symbol, and the bits are repeated sequentially starting from the second bit in subsequent OOK symbols. For example, when [b(0), b(1), b(2), b(3), b(4)] is transmitted in the OOK-4 method with M=4, b(0) to b(4) is transmitted in OOK symbol indices #0 to #4, and b(0) is repeated in the remaining OOK symbol index #5, b(1) in #6, and b(2) in #7. Improvement in detection performance can be expected through such repeated transmission. In addition, in a specific information bit configuration method, the terminal can determine early that the LP-WUS transmitted to it is not the one based solely on the detection result of the preceding bit, thereby allowing for the effect of immediately stopping LP-WUS monitoring.

[0163] Opt4, (First-chip extension): A method can be applied in which the first bit of the LP-WUS information bit is transmitted to all OOK symbols of the tail symbol. For example, when [b(0), ..., b(4)] is transmitted, b(0) can be transmitted identically to OOK symbol indices #5 through #7, which are the tail symbol interval. When configured in this way, the first OOK symbol of the corresponding OFDM symbol and the CP (Cyclic Prefix) have the same ON or OFF state, thereby minimizing the interference effect caused by the CP at the receiver.

[0164] Opt5, (Last-chip extension): A method may be applied in which the last bit (or the last k bits) of the LP-WUS information bit is transmitted to all OOK symbols of the tail symbol. For example, when [b(0), ..., b(4)] is transmitted, b(4) may be transmitted identically to the tail symbol interval, OOK symbol index #5 to #7. In this case, the receiver can determine the size of the entire information bit by identifying the last bit interval without separately setting the length of the information bit of the corresponding LP-WUS.

[0165] Opt6 (Err-chip extension): A method may be applied in which an error symbol, rather than a normal OOK symbol (or symbol pair), is used as the tail symbol. For example, when Manchester encoding is applied, a pattern violating coding rules, such as three consecutive OOK ON symbols or three OOK OFF symbols, may be used as the tail symbol. Alternatively, when the information bits of the LP-WUS are transmitted as code points or bitmaps, invalid values ​​that are not predefined or set may be used as the tail symbol. The receiver can determine the position of the last bit and the total size of the information bits through the detection of these error states.

[0166] Unless otherwise noted, the methods described above may be adaptively applied to both cases where Manchester encoding is set in the LP-WUS and where it is not set. For example, when Manchester encoding is set, transmitting a bit '1' or '0' in the tail symbol is interpreted as transmitting a pair of OOK symbols in ON-OFF order (or OFF-ON order), and otherwise, it may be interpreted as transmitting a single OOK ON symbol or OOK OFF symbol.

[0167] In addition, the above-described method can be understood as a method for configuring LP-WUS signals for OFDM symbol alignment, and whether the LP-WUS receiver actually uses the tail symbol may be separately defined or configured, or determined by the implementation of the terminal. For example, the terminal may wake up the main radio (MR) by detecting only the LP-WUS information bit without performing reception, monitoring, or decoding of the tail symbol.

[0168] The above-described method can be interpreted as a method for configuring an LP-WUS signal for OFDM symbol alignment. Additionally, whether the tail symbol is used by the LP-WUS receiver may be separately defined or configured, or determined according to the implementation of the terminal. For example, the terminal may wake up the MR by detecting an LP-WUS information bit without performing reception, monitoring, or decoding of the tail symbol.

[0169] Such OFDM symbol alignment may be required specifically under the following conditions.

[0170] - If Manchester encoding is not set in LP-WUS, the above alignment may be required depending on the combination of the size of the information bits and the M value.

[0171] Even if Manchester encoding is set in LP-WUS, the above alignment may be required under specific transmission conditions, such as when three repetitions are set.

[0172] - If the value of M exceeds 4, the above alignment may be required depending on the combination of the size of the information bit and the value of M.

[0173] - When a CRC is included and transmitted in the LP-WUS, the above alignment may be required depending on the combination of the information bits, the length of the CRC, and the M value.

[0174] - When channel coding is set in the LP-WUS information bits or mapping to a specific sequence or codeword is set, the above alignment may be required according to the combination of the number of OOK symbols corresponding to the coding or mapping result and the M value.

[0175] [Method #5] OOK Extension Method Considering Redundancy

[0176] LR can detect LP-WUS asynchronously and can obtain information through an energy detection method utilizing the characteristics of the OOK signal. Due to these detection characteristics, the service radius in which LR can reliably receive LP-WUS signals may be relatively reduced compared to the downlink (DL) signal of conventional NR. Accordingly, a repetition technique may be introduced to extend the service radius of the LP-WUS signal.

[0177] As previously explained, when N bits of information transmitted through LP-WUS are denoted as [b(0), ..., b(N-1)], repeated transmission can be classified into bit-level repetition, symbol-level repetition, and block-level repetition.

[0178] Even when the repetitive transmission described above is configured in the LP-WUS transmission, the OOK extension method of [Method #4] proposed earlier may be applied. However, the target and timing of the application of the OOK extension may be determined differently depending on each repetitive transmission method.

[0179] In Method #5, redundancy refers to information bit repetition, CRC, channel coding, etc.

[0180] When bit-level repetition is enabled, OOK extension may be applied to the result of the repeated transmission. For example, assume a situation where the LP-WUS information bits are [b(0), b(1), b(2), b(3), b(4)] and M=4. In this case, by performing OOK extension on the bit stream [b(0), b(0), b(1), b(1), b(2), b(2), b(3), b(3), b(4), b(4)] to which bit-level repetition is applied, a signal configured as [b(0), b(0), ..., b(4), b(4), X1, X2] can be transmitted through three OFDM symbols. Here, X1 and X2 can be determined according to [Method #4]. If OOK extension is performed first and then repetition is applied, the amount of redundancy caused by OOK extension may increase unnecessarily.

[0181] When symbol-level repetition is enabled, a method of repeatedly transmitting the result with OOK extension applied can be used. For example, if the LP-WUS information bits are [b(0), ..., b(4)] and M=4, a signal configured as [b(0), b(1), b(2), b(3), b(4), X1, X2, X3], which has OOK extension applied first, can be transmitted through 4 OFDM symbols by repeating [b(0), b(1), b(2), b(3), b(0), b(1), b(2), b(3), b(4), X1, X2, X3, b(4), X1, X2, X3] at the symbol level. In this case, X1, X2, and X3 are also determined through [Method #4], and if the order of application of OOK extension and repetition is changed, the amount of redundancy due to OOK extension may increase.

[0182] If block-level repetition is enabled, OOK extensions can be applied before or after the repetition is performed.

[0183] The first method (sequence 1) is to apply block-level repetition after performing OOK expansion. For example, when M=4, the expanded result [b(0), ..., b(4), X1, X2, X3] is repeated in blocks to generate [b(0), ..., X3, b(0), ..., X3], which can be transmitted through 4 OFDM symbols. This method facilitates the detection of LP-WUS information bits at the OFDM symbol level.

[0184] The second method (sequence 2) involves performing block-level repetition and then applying OOK extension. For example, if OOK extension is applied to the repeated result [b(0), ..., b(4), b(0), ..., b(4)], the signal is configured as [b(0), ..., b(4), b(0), ..., b(4), X1, X2]. This can be transmitted using three OFDM symbols. This method has the advantage of being able to transmit the same information using fewer OFDM symbols compared to sequence 1. The terminal can report its preferred method among the two methods to the base station, and the base station can set the LP-WUS transmission method to the terminal based on this.

[0185] When chip-level repetition (corresponding to [Method #6] described below) is set, whether OOK extension is applied may be determined differently depending on the value of M and whether Manchester encoding is set. For example, if chip-level repetition is set to 2, and Manchester encoding is set, OOK extension is not applied for transmissions where M=1, 2, or 4, and OOK extension may be applied only when M exceeds 4. On the other hand, if Manchester encoding is not set, extension is not applied for transmissions where M=1 or 2, and OOK extension may be applied only when M exceeds 2.

[0186] Meanwhile, to improve detection performance at the receiver, channel coding may be applied to the LP-WUS information bits, or the information bits may be transmitted mapped to a specific codeword or sequence. Alternatively, a CRC may be transmitted along with them. In such cases, OFDM symbol alignment may be required, and accordingly, OOK extension may be used. In this case, OOK extension may be performed on the information bits using [Method #1], followed by CRC addition, channel coding application, or codeword / sequence mapping, or the order may be changed to perform OOK extension in the final step. The terminal may report its preferred order or method to the base station, and the base station may set or instruct the terminal to the determined generation method.

[0187] [Method #6] How to perform chip-level repetition after Manchester encoding

[0188] In addition to bit-level repetition, symbol-level repetition, and block-level repetition, chip-level repetition (or OOK symbol-unit repetition transmission) can be applied to LP-WUS transmission. This method involves repeating the OOK symbol itself regardless of the information bit or OFDM symbol configuration, and for an LP-WUS where Manchester encoding is not set, the same result as the aforementioned bit-level repetition is obtained. However, when chip-level repetition is performed on a result to which Manchester encoding has been applied, a different result may be obtained.

[0189] FIG. 14 illustrates the difference when bit-level repetition and chip-level repetition are applied to a signal to which Manchester encoding is applied. For example, when LP-WUS information bits [1, 0] are transmitted, if Manchester encoding is applied where '1' is mapped to [ON, OFF] and '0' is mapped to [OFF, ON], the encoded OOK symbol sequence consists of [ON, OFF, OFF, ON]. In this case, when bit-level repetition is applied, the information bits themselves are expanded to [1, 1, 0, 0] before encoding, resulting in the form of [ON, OFF, ON, OFF, OFF, ON, OFF, ON]. On the other hand, when chip-level repetition is applied to the encoded result, as shown at the bottom of FIG. 14, it is configured in the form of [ON, ON, OFF, OFF, OFF, OFF, ON, ON], forming a waveform different from that of bit-level repetition.

[0190] In this way, if the result of applying Manchester encoding to the LP-WUS information bits is repeated at the chip level, a sequence of OOK symbols with a transmission rate reduced by half can be generated. A receiver receiving these OOK symbols can detect the LP-WUS signal by performing Energy Detection (ED) on an OOK symbol basis, and in this case, similar to bit-level repetition, an improvement in detection performance through repeated transmission can be expected.

[0191] Meanwhile, in an LP-WUR that operates with reduced receiver implementation complexity and low power consumption, the received OOK signal may need to be processed at a low sampling rate. In such cases, the chip-level repeated OOK symbol sequence described above allows the same LP-WUS information bit to be detected even when processed by the LP-WUR at a lower sampling rate, thereby reducing the power consumption of the receiver.

[0192] When the base station applies repetitive transmission to LP-WUS transmission, it may set or instruct a terminal or a group of terminals that LP-WUS is transmitted by applying one of the three repetitive transmission methods or chip-level repetitive methods described above. Additionally, the terminal may report to the base station that it prefers the chip-level repetitive method as the repetitive transmission method.

[0193] A-IoT (Ambient Internet of Things)

[0194] A-IoT can be a new type of device or segment that operates solely on energy harvested from the surrounding environment. For example, A-IoT can refer to a new class of Internet of Things devices that operate by being powered by various energy sources harvestable from the surrounding environment, such as radio waves, light, motion, and thermal energy.

[0195] For example, active signal generation and / or backscattering may be one of the communication technologies considered to achieve low-power operation of A-IoT devices. For example, backscattering is a widely used technique in radio frequency identification (RFID) that can enable a device 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 an incident RF signal or stored energy.

[0196] For example, A-IoT devices can be classified into various device types, such as passive, semi-passive, and active, depending on the energy storage and transmission signal generation methods. 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 assistance of the energy storage device. For example, an active device has an energy storage device and can communicate by actively generating signals using active RF components and stored energy. For example, in the present disclosure, the following three types of IoT devices may be considered. For example, device A may be a device without energy storage and without independent signal generation (e.g., a device supporting backscatter transmission). For example, device B may be a device with energy storage and without independent signal generation (e.g., a device supporting backscatter transmission). In this case, for example, the use of the stored energy may include 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).

[0197] For example, the following basic topologies may be considered to support A-IoT devices in indoor and outdoor scenarios. For example, basic topologies may include a direct connection between a base station and an A-IoT device, a connection between a base station, an intermediate node, and an A-IoT device, support for connection by an auxiliary node, and / or a connection between a terminal and an A-IoT device. The basic topologies proposed in this disclosure are merely examples, and the proposals of this disclosure may be extended and applied to other topologies.

[0198] A-IoT devices can be classified into two types as follows. For example, a Type 1 device has a maximum power consumption of approximately 1 uW, is capable of energy storage, has no amplification function, and can perform transmission by backscattering a carrier wave (CW) provided from an external source (e.g., a reader such as a base station or terminal, or a separate node). For example, a Type 2 device has a maximum power consumption of approximately several hundred uW, is capable of energy storage, has an amplification function, and can perform transmission by backscattering a carrier wave (CW) provided from an external source (e.g., a reader such as a base station or terminal, or a separate node) or by using a signal generated internally.

[0199] For example, in addition to the classification methods described above, the type / class of an A-IoT device may be distinguished based on parameters associated with device characteristics (e.g., presence / capacity of energy storage, degree of energy / power consumption, presence / capability of amplification, presence / capability of a band-pass filter (BPF), supported DL / UL transmission method(s), etc.) or combinations of parameters. Here, for example, the BPF capability may be distinguished by the 3-dB bandwidth of the supported BPF, sharpness, etc., and the UL transmission methods may be distinguished by, for example, backscattered UL transmission, UL transmission by internal signal generation, etc.

[0200] In addition, the type / class of an A-IoT device may be subdivided based on parameters associated with the above device characteristics (e.g., presence / capacity of energy storage, degree of energy / power consumption, presence / capability of amplification, presence / capability of a band-pass filter (BPF), supported DL / UL transmission method(s), etc.) or combinations of such parameters. For example, the above-described Type 2 device may be classified into Type 2a when it performs transmission by backscattering a carrier wave (CW) provided from an external source (e.g., a reader such as a base station or terminal, or a separate node), and Type 2b when it performs transmission using a signal generated internally. In this case, Types 2a and 2b may be identical in that they have a maximum power consumption of approximately several hundred uW, are capable of energy storage, and have amplification capabilities.

[0201] 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 may perform operations such as initial connection or data transmission and reception via LR instead of an operation to trigger (or activate) MR.

[0202] It is evident that the examples of the proposed methods described above can also be included as one of the implementation methods and thus can be regarded as a type of proposed method. Furthermore, while the proposed methods described above may be implemented independently, they may also be implemented in the form of a combination (or merger) of some proposed methods. Rules may be defined so that information regarding the application of the proposed methods (or information regarding the rules of the proposed methods) is communicated by a base station to a terminal or by a transmitting terminal to a receiving terminal via a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0203] Implementation example

[0204] FIG. 15 is a flowchart according to one embodiment.

[0205] Referring to FIG. 15, one embodiment based on the methods of the present specification may be a method comprising: receiving setting information for a signal (S801); receiving a signal based on the setting information (S803); and monitoring a PDCCH based on the signal reception (S805). Additionally, a corresponding method may be included in the embodiment, comprising: transmitting setting information for a signal (S801); transmitting a signal based on the setting information (S803); and transmitting a PDCCH based on the signal transmission (S805).

[0206] The signal referred to in FIG. 15 may be, for example, LP-WUS. Or, the signal may be referred to as WUS. Or, the signal may be a downlink signal related to PDCCH monitoring and / or paging monitoring. Monitoring and reception of the signal may be performed through a first receiver, and configuration information for the signal may be received through a second receiver.

[0207] When a signal is received in step S803, if the terminal is in the RRC_IDLE / RRC_INACTIVE state and the terminal determines a codepoint associated with the terminal subgroup to which it belongs during a WUS monitoring opportunity, the terminal performs PDCCH monitoring according to the Type2-PDCCH CSS (Control Search Space) set for the paging occasion associated with the WUS monitoring opportunity in step S805. If configured, the terminal may also perform PDCCH monitoring for the Type2A-PDCCH CSS set for DCI format 2_7.

[0208] When a signal is received in step S803, if the terminal is in the RRC_CONNECTED state and the terminal detects a code point associated with itself among the various code points within the WUS received from the primary cell of the cell group, the terminal starts PDCCH monitoring in all applicable serving cells of the cell group in step S805.

[0209] The first receiver corresponds to a separate receiver (i.e., LR) for receiving LP-WUS, and the second receiver corresponds to the main receiver (i.e., MR). The second receiver may be a receiver for receiving paging signals or control signals for paging signals. Alternatively, the second receiver may be a receiver capable of receiving PDCCH. Although the specific names may be changed from LP-WUS and MR to something else, the first receiver is designed to consume relatively less power than the second receiver. The main receiver may be a receiver of an existing NR system, and even if it is a receiver by a communication system other than an NR system, it may correspond to the main receiver if it is a receiver triggered based on the reception of a signal from another receiver that consumes relatively less power.

[0210] The first receiver and the second receiver may not be physically distinguishable. In the case of an A-IoT device, only the first receiver may be included among the first receiver and the second receiver.

[0211] In FIG. 15, the configuration information for the signal may include information for the overlaid sequence disclosed through methods #1 to #3. For example, the configuration information may include information for the repetition method of the OOK symbol disclosed in methods #1 and #2, the data representation method of the overlaid OFDM sequence (or overlaid sequence) (representing 1 bit per sequence or bit representation based on the number of candidate sequences) and bit order, whether and how CS hopping occurs, whether and how PS hopping occurs, etc.

[0212] Additionally, the configuration information may include information regarding the overlaid sequence of the signal. The signal of FIG. 15 is transmitted / received based on the overlaid sequence(s) over OOK and OOK ON symbols (A LP-WUS is transmitted based on OOK and overlaid OFDM sequence(s) over OOK ON symbols).

[0213] The configuration information includes information that indicates the configuration of an overlaid sequence root for a specific cell's signal for the RRC connected state and / or RRC idle / inactive state. For example, the RRC parameter lpwus-OverlaidSeqRoot (or lpwus-OverlaidSeqRoots, Indicates the configuration of overlaid sequence root for LP-WUS in the cell for RRC CONNECTED) may indicate the overlaid sequence root.

[0214] The parameter may include a first parameter (e.g., root1) for indicating a first overlaid sequence root, and a second parameter (e.g., root2) for indicating a second overlaid sequence root.

[0215] However, according to Method #3, the first overlaid sequence route and the second overlaid sequence route may have a predetermined relationship. In this case, the configuration information may include only information indicating the first overlaid sequence route. Even if the second overlaid sequence route is not indicated through the configuration information, the second overlaid sequence route can be determined through the first overlaid sequence, thereby reducing signaling overhead.

[0216] Specifically, referring to Method 3-1, the absolute value of the difference between the first overlaid sequence root and the second overlaid sequence root, and the length of the first overlaid sequence based on the first overlaid sequence root or the length of the second overlaid sequence based on the second overlaid sequence root may satisfy a mutually prime relationship.

[0217] Referring to Method 3-2, the first overlaid sequence based on the first overlaid sequence root and the second overlaid sequence based on the second overlaid sequence root can satisfy a complex conjugate relationship.

[0218] Methods 3-1 and 3-2 can be set independently for certain ranges such as terminals, terminal groups, cells, and frequency bands. Therefore, different methods may be used for each certain range such as terminals, terminal groups, cells, and frequency bands.

[0219] In the actual operation of the terminal and / or base station, even if the first overlaid sequence route and the second overlaid sequence route ultimately satisfy the relationship of Method 3-1 and / or Method 3-2, the terminal and / or base station may not recognize and operate accordingly. For example, the terminal and / or base station may add a predefined offset value to the first overlaid sequence route or select a second overlaid sequence route corresponding to the first overlaid sequence route from a pre-set table (or utilize any pre-set information regarding mapping relationships if such information exists, even if it is not in the form of a table). Therefore, even if it appears that the terminal and / or base station selects a second overlaid sequence route based on the first overlaid sequence route according to other criteria such as an offset or a table, a design in which the values ​​of the two routes selected consequently satisfy the relationship of Method 3-1 and / or Method 3-2 may also be included in what is intended to be implemented in this specification.

[0220] The configuration information may include information regarding the OOK extension method and / or symbol repetition method disclosed through methods #4 to #6. Specifically, a base station may determine the OOK extension method and / or symbol repetition method to be used for the terminal and transmit the configuration information therefor to the terminal. The terminal may receive the configuration information and perform one or more of the operations of methods #4 to #6 based on the configuration information.

[0221] FIG. 16 illustrates an example of a communication system 1 to which the implementations of the present specification apply. Referring to FIG. 16, the communication system (1) to which the present specification applies includes a wireless device, a BS, and a network. Here, a wireless device refers to a device that performs communication using wireless access technology (e.g., 5G NR (New RAT), LTE (e.g., E-UTRA)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, a 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 Thing) device (100f), and an AI device / server (400). For example, a vehicle may include a vehicle equipped with wireless communication capabilities, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, etc. Here, vehicles may include UAVs (Unmanned Aerial Vehicles) (e.g., drones). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices and may be implemented in the form of HMDs (Head-Mounted Devices), HUDs (Head-Up Displays) equipped in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Portable devices may include smartphones, smartpads, wearable devices (e.g., smartwatches, smart glasses), computers (e.g., laptops, etc.). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, BS and networks may be implemented as wireless devices, and specific wireless devices may operate as BS / network nodes to other wireless devices.

[0222] Wireless devices (100a to 100f) can be connected to a network (300) via a BS (200). Artificial Intelligence (AI) technology may 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, or a 5G (e.g., NR) network. The wireless devices (100a to 100f) may communicate with each other via the BS (200) / network (300), but they may also communicate directly (e.g., sidelink communication) without using the BS / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0223] Wireless communication / connection (150a, 150b) may be established between wireless devices (100a~100f) / BS (200) and BS (200) / wireless devices (100a~100f). Here, the wireless communication / connection may be established through uplink / downlink communication (150a) and sidelink communication (150b) (or D2D communication) using various wireless access technologies (e.g., 5G NR). Through the wireless communication / connection (150a, 150b), wireless devices and BS / wireless devices may transmit / receive wireless signals to / from each other. To this end, based on various proposals of the present specification, at least some of the following may be performed: a process for setting various configuration information for transmitting / receiving wireless signals, a process for various signal processing (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and a resource allocation process.

[0224] FIG. 10 is a block diagram illustrating examples of communication devices capable of performing the method according to the present specification. Referring to FIG. 10, a first wireless device (100) and a second wireless device (200) can transmit and / or receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} may correspond to {wireless device (100x), BS (200)} and / or {wireless device (100x), wireless device (100x)} of FIG. 16.

[0225] The first wireless device (100) includes one or more processors (102) and one or more memories (104), and may additionally include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memory (104) and / or transceivers (106) and may be configured to implement the functions, procedures and / or methods described / suggested below. For example, the processor (102) may process information within the memory (104) to generate a first information / signal and then transmit a wireless signal containing the first information / signal through the transceiver (106). Additionally, the processor (102) may receive a wireless signal containing a second information / signal through the transceiver (106) and then store information obtained from the signal processing of the second information / signal in the memory (104). Memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, memory (104) may store software code containing instructions for performing some or all of the processes controlled by the processor (102) or for performing the procedures and / or methods described / suggested below. Here, the processor (102) and memory (104) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). A transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals through one or more antennas (108). The transceiver (106) may include a transmitter and / or receiver. The transceiver (106) may be interchangeably used with an RF (Radio Frequency) unit. In this specification, a wireless device may mean a communication modem / circuit / chip.

[0226] The second wireless device (200) includes one or more processors (202) and one or more memories (204), and may additionally include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memory (204) and / or transceivers (206) and may be configured to implement the functions, procedures and / or methods described / suggested below. For example, the processor (202) may process information within the memory (204) to generate a third information / signal and then transmit a wireless signal containing the third information / signal through the transceiver (206). Additionally, the processor (202) may receive a wireless signal containing a fourth information / signal through the transceiver (206) and then store information obtained from the signal processing of the fourth information / signal in the memory (204). Memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, memory (204) may store software code containing instructions for performing some or all of the processes controlled by the processor (202) or for performing the procedures and / or methods described / suggested below. Here, the processor (202) and memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). A transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals through one or more antennas (208). The transceiver (206) may include a transmitter and / or receiver. The transceiver (206) may be interchangeably used with an RF unit. In this specification, a wireless device may mean a communication modem / circuit / chip.

[0227] The wireless communication technology implemented in the wireless device (100, 200) of this specification may include LTE, NR, and 6G, as well as Narrowband Internet of Things for low-power communication. In this case, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented according to standards such as LTE Cat NB1 and / or LTE Cat NB2, but is not limited to the names mentioned above. Additionally, or generally, the wireless communication technology implemented in the wireless device (XXX, YYY) of this specification may perform communication based on LTE-M technology. In this case, for example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented in at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the names mentioned above. Additionally or generally, wireless communication technology implemented in the wireless device (XXX, YYY) of this specification may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) with consideration for low-power communication, and is not limited to the names mentioned above. As an example, ZigBee technology can create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4 and may be referred to by various names.

[0228] Hereinafter, hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, 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 a service data adaptation protocol (SDAP) layer). One or more processors (102, 202) may generate one or more protocol data units (PDU) and / or one or more service data units (SDU) according to the functions, procedures, proposals and / or methods disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document. One or more processors (102, 202) may generate a signal (e.g., baseband signal) containing a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document and provide it to one or more transceivers (106, 206). One or more processors (102, 202) may receive a signal (e.g., baseband signal) from one or more transceivers (106, 206) and may obtain a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document.

[0229] One or more processors (102, 202) may be referred to as a controller, microcontroller, microprocessor, or 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 functions, procedures, proposals, and / or methods 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. Firmware or software configured to perform the functions, procedures, proposals, and / or methods disclosed in this document may be included in one or more processors (102, 202) or stored in one or more memories (104, 204) and driven by one or more processors (102, 202). The functions, procedures, proposals, and / or methods disclosed in this document may be implemented using firmware or software in the form of code, instructions, and / or sets of instructions.

[0230] One or more memories (104, 204) may be connected to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories (104, 204) may be composed of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer read storage media, and / or combinations thereof. One or more memories (104, 204) may be located inside and / or outside of one or more processors (102, 202). Additionally, one or more memories (104, 204) may be connected to one or more processors (102, 202) through various technologies such as wired or wireless connections.

[0231] One or more transceivers (106, 206) may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operation flowcharts, etc., of this document to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, wireless signals / channels, etc., as mentioned in the functions, procedures, proposals, methods and / or operation flowcharts, etc., disclosed in this document from one or more other devices. For example, one or more transceivers (106, 206) may be connected to one or more processors (102, 202) and may transmit and / or receive wireless signals. For example, one or more processors (102, 202) may 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 connected to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and / or receive user data, control information, wireless signals / channels, etc., as mentioned in the functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document through 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 the received wireless signal / channel, etc. from an RF band signal to a baseband signal in order to process the received user data, control information, wireless signal / channel, etc. using one or more processors (102, 202).One or more transceivers (106, 206) can convert user data, control information, wireless signals / channels, etc. processed using one or more processors (102, 202) from baseband signals to RF band signals. To this end, one or more transceivers (106, 206) may include (analog) oscillators and / or filters.

[0232] FIG. 18 illustrates another example of a wireless device capable of performing implementation(s) of the present specification. Referring to FIG. 18, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 17 and may be composed of various elements, components, units / parts, 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 component (140). The communication unit may include a communication circuit (112) and 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. 17. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 17. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and additional components (140) and controls the general operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on a program / code / command / information stored in the memory unit (130). Additionally, the control unit (120) may transmit information stored in the memory unit (130) to the outside (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from the outside (e.g., another communication device) via a wireless / wired interface through the communication unit (110) in the memory unit (130).

[0233] The additional configuration (140) can be configured in various ways depending on the type of wireless device. For example, the additional configuration (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. 16, 100a), a vehicle (Fig. 16, 100b-1, 100b-2), an XR device (Fig. 16, 100c), a portable device (Fig. 16, 100d), a home appliance (Fig. 16, 100e), an IoT device (Fig. 16, 100f), a UE for digital broadcasting, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or financial device), a security device, a climate / environment device, an AI server / device (Fig. 16, 400), a BS (Fig. 16, 200), a network node, etc. Wireless devices can be used in a movable or fixed location depending on the use—e.g., service.

[0234] In FIG. 18, 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 partially 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 connected via a wire, and the control unit (120) and the first unit (e.g., 130, 140) may be connected wirelessly via the communication unit (110). Additionally, each element, component, unit / part, and / or module within the wireless device (100, 200) may include one or more additional elements. For example, the control unit (120) may be composed of one or more sets of processors. For example, the control unit (120) may be composed of a set of communication control processors, application processors, ECUs (Electronic Control Units), graphics processing processors, memory control processors, 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, transitory memory, non-transitory memory, and / or a combination thereof.

[0235] In this specification, at least one memory (e.g., 104 or 204) may store instructions or programs, and said instructions or programs may, when executed, cause at least one processor operablely connected to said at least one memory to perform operations according to some embodiments or implementations of this specification.

[0236] In this specification, a computer-readable (non-transient) storage medium may store at least one instruction or computer program, and when executed by at least one processor, said at least one instruction or computer program may cause said at least one processor to perform operations according to some embodiments or implementations of this specification.

[0237] In this specification, a processing device or apparatus may include at least one processor and at least one computer memory connectable to said at least one processor. said at least one computer memory may store instructions or programs, and said instructions or programs, when executed, may cause at least one processor operablely connected to said at least one memory to perform operations according to some embodiments or implementations of this specification.

[0238] In this specification, a computer program may include program code stored on at least one computer-readable (non-transient) storage medium and, when executed, perform operations according to some implementations of this specification or cause at least one processor to perform operations according to some implementations of this specification. The computer program may be provided in the form of a computer program product. The computer program product may include at least one computer-readable (non-transient) storage medium.

[0239] A communication device of this specification comprises at least one processor; and at least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations according to the examples(s) of this specification described below.

[0240] As described above, the embodiments of this specification can be applied to various wireless communication systems.

Claims

Step of receiving setting information for a signal; A step of receiving the signal based on the above setting information; The method includes the step of monitoring the PDCCH (Physical Downlink Control Channel) based on the reception of the above signal, and The above signal is received based on the overlaid sequence(s) on OOK (On-Off Keying) and OOK ON symbols, and The first overlaid sequence route and the second overlaid sequence route for generating the above overlaid sequence(s) have a predetermined relationship, method. In paragraph 1, The above signal is an LP-WUS (Low-Power Wake-Up Signal) or WUS (Wake-Up Signal), method. In paragraph 1, The absolute value of the difference between the first overlaid sequence root and the second overlaid sequence root, and the length of the first overlaid sequence based on the first overlaid sequence root or the length of the second overlaid sequence based on the second overlaid sequence root satisfy a relationship in which they are mutually prime. method. In paragraph 1, The first overlaid sequence based on the first overlaid sequence root and the second overlaid sequence based on the second overlaid sequence root satisfy a complex conjugate relationship, method. In paragraph 1, The above setting information includes information indicating a first overlaid sequence route and a second overlaid sequence route having the above predetermined relationship with respect to the signal. method. In paragraph 1, The above setting information includes only information indicating the first overlaid sequence route among the first overlaid sequence route and the second overlaid sequence route for the signal, method. In paragraph 6, The second overlaid sequence route is determined by summing a preset offset value to the first overlaid sequence route. method. In paragraph 6, The second overlaid sequence route is determined by a value pre-mapped to the value of the first overlaid sequence route, method. In paragraph 1, The same information is conveyed by the above OOK and the above overlaid sequence(s), and The bit order expressed through the above overlaid sequence(s) is the reverse order of the bit order expressed through the above OOK, method. In paragraph 1, The same information is conveyed by the above OOK and the above overlaid sequence(s), and The bit order expressed through the above overlaid sequence(s) is a form in which the bit order expressed through the above OOK is shifted by L bits. method. At least one transceiver; At least one processor; and It includes at least one memory connected to the at least one processor to be operable, and storing instructions that cause the at least one processor to perform a specific operation when executed. The above specific operation is: Step of receiving setting information for a signal; A step of receiving the signal based on the above setting information; The method includes the step of monitoring the PDCCH (Physical Downlink Control Channel) based on the reception of the above signal, and The above signal is received based on the overlaid sequence(s) on OOK (On-Off Keying) and OOK ON symbols, and The first overlaid sequence route and the second overlaid sequence route for generating the above overlaid sequence(s) have a predetermined relationship, Terminal. A computer-readable non-volatile storage medium comprising at least one computer program that enables a terminal including at least one processor to perform an operation, wherein the operation is: Step of receiving setting information for a signal; A step of receiving the signal based on the above setting information; The method includes the step of monitoring the PDCCH (Physical Downlink Control Channel) based on the reception of the above signal, and The above signal is received based on the overlaid sequence(s) on OOK (On-Off Keying) and OOK ON symbols, and The first overlaid sequence route and the second overlaid sequence route for generating the above overlaid sequence(s) have a predetermined relationship, Storage medium. A step of transmitting setting information for a signal; A step of transmitting the signal based on the above setting information; The method includes the step of transmitting a PDCCH (Physical Downlink Control Channel) based on the transmission of the above signal; The above signal is transmitted based on overlaid sequence(s) on OOK (On-Off Keying) and OOK ON symbols, and The first overlaid sequence route and the second overlaid sequence route for generating the above overlaid sequence(s) have a predetermined relationship, method. At least one transceiver; At least one processor; and It includes at least one memory connected to the at least one processor to be operable, and storing instructions that cause the at least one processor to perform a specific operation when executed. The above specific operation is: A step of transmitting setting information for a signal; A step of transmitting the signal based on the above setting information; The method includes the step of transmitting a PDCCH (Physical Downlink Control Channel) based on the transmission of the above signal; The above signal is transmitted based on overlaid sequence(s) on OOK (On-Off Keying) and OOK ON symbols, and The first overlaid sequence route and the second overlaid sequence route for generating the above overlaid sequence(s) have a predetermined relationship, Base station. A computer-readable non-volatile storage medium comprising at least one computer program that enables a base station including at least one processor to perform an operation, wherein the operation is: A step of transmitting setting information for a signal; A step of transmitting the signal based on the above setting information; The method includes the step of transmitting a PDCCH (Physical Downlink Control Channel) based on the transmission of the above signal; The above signal is transmitted based on overlaid sequence(s) on OOK (On-Off Keying) and OOK ON symbols, and The first overlaid sequence route and the second overlaid sequence route for generating the above overlaid sequence(s) have a predetermined relationship, Storage medium.

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