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

Abstract

In a wireless communication system, when a base station and a terminal transmit and receive an LP-WUS and an LP-SS, a transmission power of the LP-WUS and / or the LP-SS is determined on the basis of a parameter including information on a ratio between a transmission power of a PSS / SSS and a transmission power of the LP-WUS / LP-SS. The base station and the terminal may transmit and receive the LP-WUS and / or the LP-SS on the basis of the determined transmission power.

Description

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

[0001] The present invention relates to a method and apparatus used in a wireless communication system.

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

[0003] The technical problem to be achieved by the present invention is to provide a method for efficiently transmitting and receiving wireless communication signals and a device therefor.

[0004] The technical problems of the present invention are not limited to the technical problems described above, and other technical problems can be inferred from the embodiments of the present invention.

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

[0006] In one aspect of the present invention, a method performed by a terminal in a wireless communication system is provided, comprising: receiving a parameter related to transmission power of a Low Power-Synchronization Signal (LP-SS) and a Low Power-Wake Up Signal (LP-WUS); receiving the LP-WUS after receiving the LP-SS through a first receiver of the terminal based on the parameter; and operating a second receiver of the terminal that has been stopped based on reception of the LP-WUS; wherein the parameter includes information on at least one of a ratio of transmission power of the LP-SS to transmission power of a Primary Synchronization Signal (PSS), a ratio of transmission power of the LP-WUS to transmission power of the PSS, a ratio of transmission power of the LP-SS to transmission power of a Secondary Synchronization Signal (SSS), and a ratio of transmission power of the LP-WUS to transmission power of the SSS.

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

[0008] In another aspect of the present invention, a method performed by a base station in a wireless communication system is provided, comprising: a step of setting transmission power of a Low Power-Synchronization Signal (LP-SS) and a Low Power-Wake Up Signal (LP-WUS) for a first receiver of a terminal; a step of transmitting a parameter related to the transmission power; and a step of transmitting the LP-WUS after transmitting the LP-SS based on the transmission power; wherein the parameter includes information on at least one of a ratio of the transmission power of the LP-SS to the transmission power of a Primary Synchronization Signal (PSS), a ratio of the transmission power of the LP-WUS to the transmission power of the PSS, a ratio of the transmission power of the LP-SS to the transmission power of a Secondary Synchronization Signal (SSS), and a ratio of the transmission power of the LP-WUS to the transmission power of the SSS.

[0009] As another aspect of the present invention, a device for performing the method is provided, comprising a base station, a processor, and a storage medium.

[0010] The above devices may include at least a terminal, a network, and an autonomous vehicle capable of communicating with other autonomous vehicles other than the above devices.

[0011] The above-described aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present invention described below.

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

[0013] The technical effects of the present invention are not limited to the technical effects described above, and other technical effects can be inferred from the embodiments of the present invention.

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

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

[0016] Figure 3 shows an example of physical channels being mapped within a slot.

[0017] FIGS. 4 to 10 are drawings for explaining a signal transmission and reception method according to an embodiment of the present invention.

[0018] Figures 11 to 14 illustrate devices according to embodiments of the present invention.

[0019] The following technologies can be used in various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. CDMA can be implemented using wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0020] For clarity, the description is based on a 3GPP communication system (e.g., LTE, NR), but the technical idea of ​​the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" refers to a standard document detail number. LTE / NR may be collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, reference may be made to matters described in standard documents published prior to the present invention. For example, reference may be made to the following documents.

[0021] 3GPP NR

[0022] - 38.211: Physical channels and modulation

[0023] - 38.212: Multiplexing and channel coding

[0024] - 38.213: Physical layer procedures for control

[0025] - 38.214: Physical layer procedures for data

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

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

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

[0029] In NR, uplink (UL) and downlink (DL) transmissions are structured as frames. A radio frame is 10ms long and is defined as two 5ms half-frames (HF). Each half-frame is defined as five 1ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols, depending on the cyclic prefix (CP). When normal CP is used, each slot contains 14 symbols. When extended CP is used, each slot contains 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

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

[0031] [Table 1]

[0032]

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

[0034] [Table 2]

[0035]

[0036] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) may be set differently between multiple cells that are merged into a single user equipment (UE). Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells.

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

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

[0039] [Table 3]

[0040]

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

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

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

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

[0045] Figure 3 shows an example of physical channels being mapped within a slot.

[0046] A DL control channel, DL or UL data, and UL control channel can all be included in a single slot. For example, the first N symbols in a slot can be used to transmit a DL control channel (hereinafter, DL control region), and the last M symbols in the slot can be used to transmit a UL control channel (hereinafter, UL control region). N and M are each integers greater than or equal to 0. A resource region (hereinafter, data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. A time gap for DL-to-UL or UL-to-DL switching can exist between the control region and the data region. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot can be used as a time gap.

[0047] In the present invention, the base station may be, for example, a gNodeB.

[0048] LP-WUS (Low Power Wake-Up Signal)

[0049] The contents discussed above can be applied in combination with the methods proposed in the present invention described below, or can be supplemented to clarify the technical features of the methods proposed in the present invention.

[0050] In addition, the methods described below can be equally applied to the NR system (licensed band) or shared spectrum described above, and the technical ideas proposed in this specification can be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so that they can be implemented in the corresponding systems.

[0051] In the Rel-18 NR standard, discussions are underway to introduce a low power wake-up signal (LP-WUS) and a separate receiver that can receive it, LP-WUR (low power wake-up receiver or low power wake-up radio), as a power consumption reduction method that is slightly different from the terminal power consumption reduction techniques introduced / supported in Rel-16 / 17, etc. When expressing the receiver in the terminal (receiver in the downlink) in the existing NR system as MR (Main radio / receiver), LP-WUR means a separate receiver (i.e. companion radio / receiver) that can be introduced to reduce the power consumption of the MR. LP-WUR can be simply expressed as LR.

[0052] Below, we describe options for generating LP-WUS waveforms. These can be understood as different methods for generating MC-OOK (Multi-carrier On-Off Keying) and MC-FSK (Multi-carrier Frequency Shift Keying) waveforms.

[0053] Figures 4 to 7 illustrate options for the LP-WUS waveform generation method.

[0054] Figures 4 to 7 are related to MC-ASK (amplitude shift keying) waveform generation. In Figures 4 to 7, K is the iFFT (inverse fast Fourier transform) size of CP-OFDMA (Cyclic Prefix-Orthogonal Frequency Division Multiplexing Access), and N is the number of subcarriers used in LP-WUS, including a potential guard band.

[0055] Figure 4 shows option OOK-1.

[0056] In option OOK-1, one OFDM symbol contains a single bit. For the subcarriers of LP-WUS, OOK=1 means that all subcarriers are modulated. OOK=0 means that all subcarriers are at zero power (from the baseband perspective).

[0057] Figure 5 shows option OOK-2.

[0058] Referring to Figure 5, Option OOK-2 includes M bits of OOK in parallel within the frequency domain. The N subcarriers of LP-WUS are divided into M segments. Guard bands may be included between and / or around each segment. OOK=1 means that all subcarriers within the segment are modulated. OOK=0 means that all subcarriers within the segment are at zero power (from a baseband perspective).

[0059] Figure 6 shows option OOK-3.

[0060] Referring to FIG. 6, option OOK-3 corresponds to a multi-tone single-bit OOK. The N subcarriers of LP-WUS are divided into L segments. There is no guard band between segments, and there may be guard bands around the segments. OOK=1 means that one subcarrier (recognized by the UE) of each segment is modulated, and the remaining subcarriers are at zero power (from the baseband perspective). OOK=0 means that all subcarriers within the segment are at zero power (from the baseband perspective).

[0061] Figure 7 shows option OOK-4.

[0062] Referring to Fig. 7, in option OOK-4, an M-bit OOK in the time domain is transformed. N subcarriers of OOK-1 are generated by a transformation (DFT / Least Square). N' samples are generated from the M bits. Signal modification may or may not be used. Truncation or other additional modifications may or may not be used. If not used, N and N' are the same. N' can be equal to K.

[0063] In FIGS. 4 to 7, the modulated subcarriers may be, for example, QAM (Quadrature Amplitude Modulation) symbols, sequences, or other signals.

[0064] The subcarriers in the potential guard band are zero power (from the baseband perspective). Optionally, one of the two additional segments can be always modulated and the other can always be transmitted at zero power (from the baseband perspective).

[0065] Symbols modified in the OOK manner may be referred to as OOK symbols. For convenience, "OOK-1 and / or OOK-4" may be simply written as "OOK-1 / 4."

[0066] For OOK-1, one OOK symbol can be matched to one OFDM symbol interval, and for OOK-4, M OOK symbols can be mapped to one OFDM symbol interval. Therefore, OOK-1 can transmit 1 bit per OFDM symbol, and OOK-4 can transmit M bits per OFDM symbol. If MC (Manchester encoding) is additionally used for LP-WUS, twice as many OFDM symbols may be required to transmit the same bit. Meanwhile, a terminal (including LP-WUR) that receives LP-WUS can perform an MR wake-up operation. For this purpose, an ID (identifier) ​​that can distinguish each terminal or a (sub)group of terminals can be included in the LP-WUS signal. The UE ID can be (for example) a 5G-S-TMSI value or a value reduced by modulo operation, etc. This value can be approximately 48 bits depending on the ID used. Accordingly, a significant number of OFDM symbols may be used to transmit a UE ID via OOK-1 / 4. For example, assuming the use of MC to transmit a 48-bit UE ID, 96 OFDM symbols are required for OOK-1. When the part containing information such as the UE ID is called the message part of LP-WUS, if a preamble part to assist in receiving the message part is transmitted together, the number of OFDM symbols required may increase. The preamble part can convey information necessary for LR to detect / decode the message part. Fig. 8 shows an example of LP-WUS transmission including a preamble part and a message part.

[0067] If an LP-WUS signal transmitted to a specific terminal (or group of terminals) occupies a specific (frequency / time) channel for a certain period of time, it can result in inefficient use of resources for both the network and the terminal. From the perspective of receiving the LP-WUS signal, it can be vulnerable to interference. Furthermore, if accurate time synchronization is not secured, LP-WUR may have to attempt monitoring for a period longer than the actual length of the LP-WUS signal. When the LP-WUS signal is composed of a preamble part and a message part, an effective signal configuration and setting method is required.

[0068] Meanwhile, the LP-WUS signal may use an overlaid sequence together with the OOK waveform. Depending on how the overlaid sequence is overlaid on each OOK signal or OFDM signal, it may affect the LP-WUS transmission time and / or the frequency resources occupied by the LP-WUS. Additionally, if some information is transmitted through the overlaid sequence, this may be a way to expand the utilization of the LP-WUS signal. However, not all LP-WUSs can detect / decode the overlaid sequence. If the overlaid sequence modulates each subcarrier in the frequency domain, only LP-WUSs that have FFT and / or frequency-domain sequence correlation capabilities can receive the overlaid sequence. Even if the sequence is overlaid on each OOK symbol or OFDM symbol in the time domain, only LP-WUSs that have sequence correlation capabilities in the time domain can receive the sequence. Since the lowest complexity LP-WUR may only distinguish ON / OFF of the OOK symbol, the overlay sequence needs to be designed considering these various types of LP-WUR.

[0069] Meanwhile, a separate LP-SS (low power synchronization signal) may be defined and transmitted to synchronize the time / frequency required for receiving the LP-WUR transmitted from the LP-WUR. The LP-SS may be a signal / waveform generated according to an OOK or FSK waveform generation method (similar to the LP-WUS), and an overlay sequence may be applied. The LP-SS may be a signal transmitted periodically or aperiodically. Based on the LP-SS, the LP-WUR may measure the power of the received signal, etc., to offload or relax the RRM measurement of the MR.

[0070] As described above, the LP-WUS signal (transmitted by the base station) can be composed of a preamble part and a message part. The preamble part can include information necessary for receiving the message part transmitted subsequently (e.g., data rate, modulation, encoding method of the message part, etc.). Alternatively, the preamble part can include a known sequence / signal without conveying any specific information. Alternatively, a separate known sequence / signal can be transmitted together before or after the preamble part. The message part can carry identification information (for a specific terminal or a (sub)group of terminals), or can simply transmit a wake-up indication for multiple terminals. Alternatively, cell-related information, emergency-related information such as ETWS (Earthquake and Tsunami Warning System) / CMAS (Commercial Mobile Alert System), tracking area, RAN (radio access network) area, SI (system information) change instructions, or system-related information (for a terminal) or paging-related information may be transmitted. In addition to the preamble part and / or the message part, a CRC (Cyclic Redundancy Check) may be transmitted. At this time, the CRC may be generated based on the preamble part and / or the message part. Depending on the setting, the CRC may not be added. Although the proposed methods of the present invention have been described assuming a preamble part, a message part and / or a CRC having such characteristics, they are not necessarily limited to LP-WUS transmission having such a structure.

[0071] In the following proposal, the occasion can mean a TO (transmission occasion) when a base station transmits a signal or a MO (monitoring occasion) when a receiver (such as an LP-WUR) monitors a signal, depending on the context. Since TO means an opportunity for a signal to be transmitted, the signal may not be transmitted at that location (depending on the configuration or the needs of the base station). MO means an opportunity to monitor a signal, so the receiver may not monitor the signal at that location (depending on the configuration or the needs / circumstances of the base station / terminal). In addition, for the convenience of writing, even if it is simply expressed as MO or TO, it can represent MO, TO, or MO and TO depending on the proposal method and context.

[0072] The following proposal assumes periodically transmitted LP-SS (unless otherwise noted). However, the proposed method and configuration can equally be applied to aperiodically transmitted LP-SS.

[0073] In the following proposal, the preamble part of LP-WUS is described as being intended to convey configuration information for transmission of subsequent message parts, or as including such information transmission part and a known sequence / signal. However, in cases where information for transmission of the message part is conveyed via LP-SS, or where the preamble part is used as a known sequence / signal (without separate information transmission), the preamble or preamble part in the proposed method described below may be replaced with LP-SS.

[0074] In this specification, the symbols '●', '■', and '◆' listed at the beginning of each paragraph can indicate vertical / horizontal relationships between descriptions within each paragraph. Specifically, '●', '■', and '◆' can indicate upper categories in that order. For example, '■' listed after '●' can be a supplementary explanation of '●'. '◆' listed after '■' can be a supplementary explanation of '■'.

[0075] [Method #1] How to set up multiplexing of LP-SS and LP-WUS

[0076] 1) Receiver (Entity A):

[0077] ● The terminal may be configured / instructed on how to multiplex the LP-SS / LP-WUS signal and the NR signal / channel (transmitted in the same cell) through one or more of the following methods.

[0078] ■ The terminal can be instructed whether to multiplex the frequency of the LP-SS / LP-WUS signal and the NR signal through the LP-SS or LP-WUS preamble part.

[0079] ■ The terminal may not monitor the LP-SS / LP-WUS signal if the separately configured LP-SS / LP-WUS opportunity fully / partially overlaps with the NR SSB or SPS resources (in the time / frequency domain).

[0080] ● The terminal can set multiplexing in the time / frequency domain between LP-SS and LP-WUS to one or more of the following patterns.

[0081] ■ Pattern 1: LP-SS and LP-WUS can be transmitted continuously in the time domain, and the frequency domain of LP-SS is fully included in the frequency domain of LP-WUS (LP-SS are fully included in LP-WUS freq. resources).

[0082] ■ Pattern 3: LP-SS and LP-WUS can be transmitted on different frequencies, and LP-SS is transmitted / monitored at the same time as LP-WUS.

[0083] ■ Pattern 2: LP-SS and LP-WUS can be transmitted on different frequencies, and the LP-SS and LP-WUS preamble parts do not overlap in the time domain. LP-SS can be transmitted / monitored at the same time as the LP-WUS message part.

[0084] 2) Transmitter (Entity B):

[0085] ● The base station may configure / instruct how to multiplex LP-SS / LP-WUS signals and NR signals / channels (transmitted in the same cell) through one or more of the following methods.

[0086] ■ The base station can indicate whether to frequency multiplex the LP-SS / LP-WUS signal and the NR signal through the LP-SS or LP-WUS preamble part.

[0087] ■ The base station may not transmit the LP-SS / LP-WUS signal if the separately configured LP-SS / LP-WUS opportunity fully / partially overlaps (in the time / frequency domain) with the NR SSB or SPS resources.

[0088] ● The base station can set multiplexing in the time / frequency domain between LP-SS and LP-WUS to one or more of the following patterns.

[0089] ■ Pattern 1: LP-SS and LP-WUS can be transmitted continuously in the time domain, and the frequency domain of LP-SS is fully included in the frequency domain of LP-WUS (LP-SS are fully included in LP-WUS freq. resources).

[0090] ■ Pattern 3: The base station can transmit LP-SS and LP-WUS on different frequencies, and LP-SS is transmitted / monitored at the same time as LP-WUS.

[0091] ■ Pattern 2: The base station can transmit LP-SS and LP-WUS on different frequencies, and the LP-SS and LP-WUS preamble parts do not overlap in the time domain. LP-SS can be transmitted / monitored at the same time as the LP-WUS message part.

[0092] [Method #2] Setting up Intra / Inter-Cell Interference Mitigation

[0093] 1) Receiver (Entity A):

[0094] ● The terminal can set / instruct the transmission power ratio of LP-SS / LP-WUS to PSS / SSS EPRE (Energy Per Resource Element) through upper layer parameters.

[0095] ■ For example, the transmission power ratio of LP-SS / LP-WUS to SSS EPRE can be set to one of {-3,0,3,6} dB.

[0096] ■ Alternatively, a separate parameter can be defined / set by RRC, similar to the transmission power ratio (={-3,0,3,6} dB) of CSI-RS or TRS compared to SSS EPRE in conventional NR.

[0097] ● The terminal can be configured to boost the power of LP-SS / LP-WUS equally when SSS or PSS is power boosted.

[0098] ● The terminal can detect the CS (cyclic shift) value applied to the received LP-SS through time domain correlation, etc. Based on this, the terminal can obtain part of the PCI (physical cell ID) of the cell where the LP-SS / LP-WUS is received.

[0099] ■ For example, the terminal can find the value of PCI modulo the LP-SS sequence length (=N) through the detected CS.

[0100] ● The terminal can detect / decode the time / frequency resources in which the LP-SS / LP-WUS is received, and thereby find out the PCI of the cell in which the LP-SS / LP-WUS is transmitted.

[0101] 2) Transmitter (Entity B):

[0102] ● The base station can set / instruct the transmission power ratio of LP-SS / LP-WUS to PSS / SSS EPRE through upper layer parameters.

[0103] ■ For example, the transmission power ratio of LP-SS / LP-WUS to SSS EPRE can be set to one of {-3,0,3,6} dB.

[0104] ■ Alternatively, a separate parameter can be defined / set by RRC, similar to the transmission power ratio (={-3,0,3,6} dB) of CSI-RS or TRS compared to SSS EPRE in conventional NR.

[0105] ● The base station can be set to boost the power of LP-SS / LP-WUS equally when SSS or PSS is power boosted.

[0106] ● The base station can set / determine the CS (cyclic shift) applied to the LP-SS according to the PCI (physical cell ID) of the cell where the LP-SS / LP-WUS is transmitted.

[0107] ■ For example, the CS to be applied to LP-SS can be determined based on the value obtained by modulo the PCI to the LP-SS sequence length (=N).

[0108] ● The base station can set the time / frequency resources of LP-SS differently depending on the PCI through which LP-SS / LP-WUS is transmitted.

[0109] ■ For example, LP-SS / LP-WUS can be transmitted on one of four different frequencies per cell (such as PBCH-DMRS v-shift).

[0110] [Method #3] If the WUR does not process the override sequence with UE capability for override sequences

[0111] ● LP-WUR Type 2 terminals can receive LP-SS / LP-WUS signals by performing ED (energy detection) for OOK symbols to further reduce power consumption of LR, even though they can decode overlay sequences.

[0112] ● LP-WUR Type 2 terminals can receive LP-SS / LP-WUS signals by performing ED for OOK symbols when the RSRP of the overlay sequence is low or the time / frequency error is severe, making reception of the overlay sequence unstable.

[0113] ■ Alternatively, in this case, even if the terminal can still receive the OOK symbol stably (for example, even if the RRM measurement result (e.g., RSRP, etc.) of the corresponding OOK signal is above a certain threshold value), it can fallback to the operation of the MR by waking up the MR.

[0114] ■ The terminal can set / be instructed to perform the above operation through upper layer parameters.

[0115] ● The terminal can report / feedback to the base station (via a separate UL channel) about the operations of the above two terminals while the MR is in a wake-up state.

[0116] [Method #4] A method for a terminal supporting LP-WUS reception and related operations to transmit LP-SS / LP-WUS / LP-WUR related information to a base station.

[0117] ● The terminal may request changes to settings related to LP-SS / LP-WUS transmission.

[0118] ■ For example, in order to change LP-SS / LP-WUS opportunity settings, power boosting settings, OOK modulation method, overlay sequence related settings, repetition settings of OOK / OFDM symbols in time / frequency domain, etc., the terminal can request a change in settings to the base station.

[0119] ● The terminal can report the LP-WUR reception status to the base station.

[0120] ■ For example, the terminal can report the situation of [Method #3] above.

[0121] ● The terminal can request LP-SS / LP-WUS transmission on-demand.

[0122] ■ The terminal can request to transmit LP-SS / LP-WUS to a cell where LP-SS / LP-WUS is not set up / transmitted.

[0123] ■ The terminal can request transmission of LP-SS / LP-WUS on frequency resources where LP-SS / LP-WUS is not set / transmitted.

[0124] ■ The terminal may request additional transmission of LP-SS / LP-WUS outside of the configured LP-SS / LP-WUS opportunities.

[0125] ◆ For example, if the terminal can set / be instructed to transmit LP-SS through SIB1, if the setting is LP-SS on, the terminal can request on-demand LP-SS (in a time period or frequency resource where LP-SS is not transmitted or received).

[0126] ◆ As another example, even if the corresponding setting is set to LP-SS off, the terminal can request on-demand LP-SS. In this case, the base station that received the on-demand LP-SS request can (re)configure LP-SS to on through SIB1. Alternatively, the base station can transmit LP-SS without a separate SIB1 update. The terminal that requested on-demand LP-SS can blindly detect the LP-SS signal immediately after the on-demand LP-SS request (or after a specific time).

[0127] ● Reporting of the above terminal can be done through the following UL signals / channels:

[0128] ■ RACH is used in idle mode, and RACH, PUCCH, and / or CG-PUSCH can be used in inactive mode.

[0129] ■ Alternatively, it can be used through UE assistance information.

[0130] ■ The above terminal report can be made after the MR wakes up. When the base station receives the above report, it can infer that the terminal's MR has woken up through the LP-WUS signal.

[0131] [Method #5] LP-WUS / LP-SS signal modulation method and frequency resource setting

[0132] ● When the UEs monitoring the PO are sub-grouped by PO, the base station may limit the number of OOK symbols per OFDM symbol transmitting LP-WUS (i.e., M) if the number of sub-groups per PO is greater than a certain number (to avoid LP-WUS transmissions occupying many symbols).

[0133] ■ For example, when generating LP-WUS via OOK-4, M=4 can be set if the number of subgroups per PO is greater than a certain value, and conversely, when the number of subgroups per PO is less than a certain value, M=2 can be set (or transmission via M=1 and / or OOK-1 can be set).

[0134] ● For terminals in connection mode, frequency resources for LP-WUS / LP-SS transmission can be set (in RB units or RE units) within the frequency resources set in the lowest CORESET among the CORESETs of the active BWP.

[0135] ■ LP-WUS / LP-SS frequency resources can be configured starting from the highest / lowest RE of the corresponding CORESET or with an RE offset (or RB offset) from it.

[0136] ● For terminals in idle / inactive mode, frequency resources for LP-WUS / LP-SS transmission can be set (in RB units or RE units) within the frequency resources set in the CORESET with the lowest index among the CORESETs set in the initial or default BWP.

[0137] ■ LP-WUS / LP-SS frequency resources can be configured starting from the highest / lowest RE of the corresponding CORESET or with an RE offset (or RB offset) from it.

[0138] [Method #6] How to set up an overlay sequence

[0139] ● The proposed method below is described for LP-WUS (for convenience). However, the same method can be applied / configured for LP-SS signals as well.

[0140] ● NR channels / signals for other purposes (different from LP-WUS) can be used as overlay sequences for LP-WUS through processes such as puncturing. The explanation assumes that the bandwidth allocated to LP-WUS / LP-SS transmission is 11 PRB. However, if the bandwidth set by the base station is a different value, that value can be applied.

[0141] ■ For example, a PDCCH signal transmitted with a bandwidth larger than 11 PRBs is punctured to fit 11 PRBs, and the signal can be used as an overlay sequence of LP-WUS.

[0142] ● (When Manchester encoding (MC) is used in LP-WUS) The overlay sequence transmitted to LP-WUS can be defined by Manchester encoding units (e.g., two consecutive OOK symbols consisting of one OOK ON symbol and one OOK OFF symbol) or length. In this case, only the portion corresponding to the OOK ON symbol among the sequences of the above 2 OOK symbols can be transmitted as the overlay sequence of LP-WUS.

[0143] ■ For example, when N consecutive OOK symbols transmitted by LP-WUS are represented as S(1), ..., S(N), the above overlay sequence can be applied in units of 2 symbols (e.g., {S(1), S(2)}).

[0144] ■ The meaning that the above overlaid sequence is applied may mean that the overlaid sequence is used to generate the OOK symbol in the sample domain before the DFT in case of OOK-4. Or, the sequence may be multiplied by the LP-WUS content in the domain before the DFT. Or, the meaning that the above overlaid sequence is applied may mean that the sequence is applied in the frequency domain after the DFT in case of OOK-4. Or, the meaning that the above overlaid sequence is applied may mean that the sequence is applied (e.g., multiplication operation) in the time domain after the IFFT.

[0145] ■ The overlay sequence is defined by MC unit, and the method of puncturing is done according to ON-OFF or OFF-ON.

[0146] ◆ When the length of one OOK symbol (e.g., number of samples) is L, a 2*L length sequence is defined. Alternatively, a L length sequence may be repeated twice, or a sequence with a cyclic shift and / or phase shift applied may be repeated.

[0147] ◆ For example, if an overlay sequence is defined in the form of [seq#1, seq#2] using two sequences of length L, and if two consecutive OOK symbols are in the ON-OFF order, seq#1 can be used as the overlay sequence for the two OOK symbols, and if they are in the OFF-ON order, seq#2 can be used as the overlay sequence for the two OOK symbols.

[0148] ● (When Manchester encoding is set) If the overlay sequence is defined in OOK symbol units / length, the length of the overlay sequence can be determined by dividing the DFT size (which generates the LP-WUS / LP-SS to which the sequence is applied) by M (or dividing by 0.5*M).

[0149] ● (When Manchester encoding is set) If the overlay sequence is defined in OFDM symbol units / length, the length of the overlay sequence can be determined as half (i.e., divided by 2) of the DFT size (which generates the LP-WUS / LP-SS to which the sequence is applied) (or can be determined to be the same as the DFT size).

[0150] ● If an overlay sequence is transmitted together with LP-WUS, and the information bits transmitted through LP-WUS are transmitted in a joint coding manner of the OOK symbol and the overlay sequence (for example, half of the N-bit content is transmitted as an OOK symbol and the other half is transmitted as an overlay sequence), the terminal can receive all LP-WUS information and terminate LP-WUS monitoring early by decoding half of the OOK symbols (and the overlay sequence applied to the corresponding OOK symbols) without receiving all OOK symbols. For example, if the N-bit content is represented as C(1), ..., C(N), C(1)~C(N / 2) can be transmitted through the ON / OFF pattern of the OOK symbol, and C(N / 2+1)~C(N) can be transmitted through the overlay sequence applied to the corresponding OOK symbol.

[0151] ■ At this time, when C(1), ..., C(N) are expressed as block#1, and C(N / 2+1)~C(N) are expressed as block#2, there may be cases where block#1 is transmitted as an OOK symbol and block#2 is transmitted as an overlay sequence, and cases where block#2 is transmitted as an OOK symbol and block#1 is transmitted as an overlay sequence. Even if the information that the terminal can obtain through LP-WUS is the same, it can distinguish between two different cases. Through this, the base station can transmit 1 additional information bit.

[0152] ◆ This additional bit can be used for various purposes. For example, this bit can be used to distinguish LP-WUS for idle mode terminals / inactive mode terminals and connected mode terminals.

[0153] ■ Similarly, if N / 3 bits are transmitted via the OOK symbol and the remaining bits are transmitted via the overlaid sequence, the terminal can distinguish three different cases depending on which bits are transmitted via the OOK symbol or the overlaid sequence. Additional bits can be transmitted in this way.

[0154] ■ More generally, the entire information bits transmitted via LP-WUS are divided into two (which may have the same or different numbers of bits). When the two divided information bits are transmitted separately via the OOK symbol and the overlay sequence, even if the entire transmitted bits are the same, if the transmission bit order is adjusted so that the terminal can distinguish between different cases, additional bits can be transmitted via LP-WUS.

[0155] Meanwhile, the present invention is not limited to the transmission and reception of uplink and / or downlink signals. For example, the present invention can also be used in direct communication between terminals. Furthermore, the base station in the present invention may include not only a base station but also a relay node. For example, the base station operations in the present invention may be performed by the base station, but may also be performed by a relay node.

[0156] A-IoT (Ambient Internet of Things)

[0157] A-IoT could be a new type / segment of devices that operate solely on energy harvested from the surrounding environment. For example, A-IoT could refer to a new type of Internet of Things device that is powered by various energy sources harvested from the surrounding environment, such as radio waves, light, motion, and heat.

[0158] For example, active signal generation and / or backscattering may be among the communication technologies considered to achieve low-power operation of A-IoT devices. For example, backscattering is a technique widely used in radio frequency identification (RFID), which allows devices to communicate with a network by reflecting incident waves after modulating them with information to be transmitted. For example, the device may be powered by the incident RF signal or by stored energy.

[0159] For example, IoT devices can be classified into various device types, such as passive, semi-passive, and active, depending on how they store energy and generate transmission signals. For example, a passive device does not have an energy storage device (e.g., a capacitor) and can communicate based on backscatter communication technology. For example, a semi-passive device has an energy storage device and can communicate using backscatter communication technology with the help of the energy storage device. For example, an active device has an energy storage device and can actively generate signals using active RF components and the stored energy to communicate. For example, in the present disclosure, the following three types of IoT devices can be considered. For example, device A can be a device without energy storage and without independent signal generation (e.g., a device that supports backscatter transmission). For example, device B can be a device with energy storage and without independent signal generation (e.g., a device that supports backscatter transmission). In this case, for example, the use of stored energy may involve amplification of the reflected signal. For example, device C may be a device with energy storage and independent signal generation (e.g., a device with an active RF component for transmission).

[0160] For example, the following basic topologies may be considered to support A-IoT devices in indoor and outdoor scenarios. For example, the basic topologies may include direct connections between base stations and A-IoT devices, connections between base stations and intermediate nodes and A-IoT devices, connection support by auxiliary nodes, and / or connections between terminals and A-IoT devices. The basic topologies proposed in this disclosure are merely examples, and the proposals in this disclosure may be extended / applied to other topologies.

[0161] A-IoT devices can be categorized into two types: Type 1 devices, which have a maximum power consumption of approximately 1 uW, are capable of storing energy, do not have an amplification function, and can transmit by backscattering a carrier wave (CW) provided from an external source (e.g., a reader such as a base station or a terminal, or a separate node). Type 2 devices, for example, have a maximum power consumption of approximately several hundred uW, are capable of storing energy, are capable of amplification, and can transmit by backscattering a carrier wave (CW) provided from an external source (e.g., a reader such as a base station or a terminal, or a separate node) or by using a signal generated internally.

[0162] For example, in addition to the above-described classification methods, the type / class of A-IoT devices can be distinguished based on parameters associated with device characteristics (e.g., presence / capacity of energy storage, energy / power consumption, presence / capacity of amplification, presence / capacity of BPF (band-pass filter), supported DL / UL transmission method(s), etc.) or a combination of parameters. Here, for example, BPF capability can be distinguished by 3-dB bandwidth of supported BPF, sharpness, etc., and UL transmission methods can be distinguished by, for example, backscatter UL transmission, UL transmission by internal signal generation, etc.

[0163] In addition, the type / class of A-IoT devices can be subdivided based on parameters associated with the device characteristics (e.g., presence / capacity of energy storage, level of energy / power consumption, presence / capacity of amplification, presence / capacity of band-pass filter (BPF), supported DL / UL transmission method(s), etc.) or a combination of parameters. For example, the above-described Type 2 device can be classified into Type 2a if it performs transmission by backscattering a carrier wave (CW) provided from the outside (e.g., a reader such as a base station or terminal or a separate node), and Type 2b if it performs transmission using a signal generated internally by itself. In this case, Type 2a and 2b can be the same in that they have a maximum power consumption of approximately several hundred microwatts, are capable of energy storage, and have an amplification function.

[0164] LP-WUS can be transmitted and received between A-IoT devices. Specifically, the waveform transmitted from the reader to the A-IoT device may correspond to the waveform proposed through the embodiments of this specification. The A-IoT device may include only LR without MR. Therefore, when the A-IoT device receives LP-WUS, it can perform operations such as initial connection or data transmission / reception through LR instead of triggering (or activating) MR.

[0165] It is clear that the examples of the proposed methods described above can also be considered as a type of proposed methods, as they can be included as one of the implementation methods of the present invention. In addition, the proposed methods described above can be implemented independently, but can also be implemented in the form of a combination (or merge) of some of the proposed methods. Information on whether the proposed methods are applicable (or information on the rules of the proposed methods) can be defined by a rule so that the base station notifies the terminal or the transmitting terminal notifies the receiving terminal through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0166] Implementation example

[0167] Figure 9 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0168] Referring to FIG. 9, a signal transmission and reception method according to an embodiment of the present invention may be performed by a terminal and may include a step (S501) of receiving a signal through a first receiver, and a step (S503) of performing a specific operation based on the reception of the signal.

[0169] The specific action may be an action by which the terminal triggers a second receiver. Alternatively, if the terminal is an A-IoT device, the action may be an action by which the terminal transmits a response signal based on the signal.

[0170] The above signal may be an LP-SS and / or LP-WUS as described in the present specification. Even if expressed by another name, if the signal is a signal for triggering the operation of another receiver based on the signal being received by a specific receiver or a signal received by an A-IoT device, it may correspond to the LP-WUS of the present specification. In addition, even if expressed by another name, if the signal is a signal for synchronizing the LP-WUS, it may correspond to the LP-WUS of the present specification.

[0171] The first receiver corresponds to a separate receiver (i.e., LP-WUR) for receiving LP-WUS, and the second receiver corresponds to a primary receiver (i.e., MR). The second receiver may be a receiver for receiving a paging signal or a control signal for a paging signal. Alternatively, the second receiver may be a receiver capable of receiving a PDCCH. The specific name may be changed from LP-WUR and MR, but the first receiver is designed to consume relatively less power than the second receiver. The primary receiver may be a receiver of an existing NR system, and even if it is a receiver by a communication system other than an NR system, if it is a receiver that is triggered based on the reception of a signal of another receiver that consumes relatively less power, it may correspond to the primary receiver.

[0172] However, in the case of an A-IoT device, only the first receiver among the first and second receivers may be included.

[0173] In addition to the basic operation of FIG. 9, the operations described in Method #1 to Method #6 can be combined.

[0174] Figure 10 is a flowchart that further concretizes a signal transmission and reception method according to an embodiment of the present invention.

[0175] Referring to FIG. 10, a signal transmission and reception method from a terminal perspective according to an embodiment of the present invention may be configured to include a step of receiving parameters related to transmission power of LP-SS and LP-WUS (S1002), a step of receiving the LP-SS through a first receiver of the terminal based on the parameters and then receiving the LP-WUS (S1004), and a step of operating a second receiver that has been stopped based on the reception of the LP-WUS (S1005). A signal transmission and reception method from a base station perspective according to an embodiment of the present invention may be configured to include a step of setting transmission power of LP-SS and LP-WUS (S1001), a step of transmitting parameters related to the transmission power (S1002), and a step of transmitting the LP-WUS after transmission of the LP-SS based on the transmission power (S1003).

[0176] The transmission power of LP-SS and LP-WUS can be determined based on method #2.

[0177] For example, the parameter for the transmission power may include information on at least one of the ratio of the transmission power of the LP-SS to the transmission power of the PSS, the ratio of the transmission power of the LP-WUS to the transmission power of the PSS, the ratio of the transmission power of the LP-SS to the transmission power of the SSS, and the ratio of the transmission power of the LP-WUS to the transmission power of the SSS. Each ratio may be set to one of -3 dB, 0 dB, 3 dB, and 6 dB with respect to a reference signal. The parameter for the transmission power may be a higher layer parameter and may be transmitted and received via SIB or RRC signaling.

[0178] The terminal determines whether to start monitoring the LP-SS or LP-WUS based on the SSB reception result. Specifically, the terminal starts monitoring the LP-SS or LP-WUS if the RRM measurement value of the SSB received from the serving cell is greater than or equal to a threshold. Therefore, since one or more SSB receptions are performed before receiving the LP-SS or LP-WUS, it may be advantageous to determine the beam direction, appropriate transmission power, etc. based on the SSB. By obtaining parameters for the transmission power, the terminal can calculate the path loss of the LP-SS or LP-WUS and reduce the AGC (automatic gain control) adjustment time.

[0179] The base station can determine the CS value of the LP-SS based on a portion of the PCI of the cell from which the LP-SS is transmitted. The terminal can obtain a portion of the PCI of the cell from which the LP-SS is received based on the CS value of the received LP-SS. The portion of the PCI may be identical to a value obtained by modulo calculating the PCI by the length of the LP-SS sequence.

[0180] The base station determines the resource location where the LP-SS or LP-WUS signal is transmitted based on the PCI of the cell where the signal is transmitted. The terminal obtains the PCI of the cell where the signal is received based on the resource location where the LP-SS or LP-WUS is received.

[0181] Additionally, one or more of the operations disclosed in FIGS. 1 to 9 and Method #1 to Method #6 may be performed.

[0182] Examples of communication systems to which the present invention is applied

[0183] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present invention disclosed in this document may be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0184] Hereinafter, more specific examples will be provided with reference to the drawings. In the drawings / descriptions below, the same drawing reference numerals may represent identical or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise described.

[0185] Figure 11 illustrates a communication system (1) applied to the present invention.

[0186] Referring to FIG. 11, a communication system (1) applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and can be implemented in the form of HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0187] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0188] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or, D2D communication), and communication between base stations (150c) (e.g., relay, IAB (Integrated Access Backhaul). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes can be performed based on various proposals of the present invention.

[0189] Examples of wireless devices to which the present invention is applied

[0190] Figure 12 illustrates a wireless device applicable to the present invention.

[0191] Referring to FIG. 12, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 11.

[0192] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0193] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0194] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0195] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0196] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0197] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0198] Examples of wireless devices to which the present invention is applied

[0199] Figure 13 illustrates another example of a wireless device applicable to the present invention. The wireless device may be implemented in various forms depending on the use case / service (see Figure 11).

[0200] Referring to FIG. 13, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 12 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and an additional element (140). The communication unit may include a communication circuit (112) and a transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 12. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 12. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0201] The additional element (140) may be configured in various ways depending on the type of the wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 11, 100a), a vehicle (Fig. 11, 100b-1, 100b-2), an XR device (Fig. 11, 100c), a portable device (Fig. 11, 100d), a home appliance (Fig. 11, 100e), an IoT device (Fig. 11, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 11, 400), a base station (Fig. 11, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0202] In FIG. 13, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of one or more processor sets. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0203] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0204] Figure 14 illustrates a vehicle or autonomous vehicle applicable to the present invention. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned or unmanned aerial vehicle (AV), a ship, or the like.

[0205] Referring to FIG. 14, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 of FIG. 8, respectively.

[0206] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit (120) can control elements of the vehicle or autonomous vehicle (100) to perform various operations. The control unit (120) can include an ECU (Electronic Control Unit). The drive unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The drive unit (140a) can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit (140b) supplies power to the vehicle or autonomous vehicle (100) and can include a wired / wireless charging circuit, a battery, etc. The sensor unit (140c) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (140c) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit (140d) may implement a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0207] For example, the communication unit (110) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (140d) can generate an autonomous driving route and driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or autonomous vehicle (100) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit (140c) can acquire vehicle status and surrounding environment information. The autonomous driving unit (140d) can update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to the external server. External servers can predict traffic information data in advance using AI technology or other technologies based on information collected from vehicles or autonomous vehicles, and provide the predicted traffic information data to the vehicles or autonomous vehicles.

[0208] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the scope of the invention. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0209] As described above, the present invention can be applied to various wireless communication systems.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving parameters related to transmission power of LP-SS (Low Power-Synchronization Signal) and LP-WUS (Low Power-Wake Up Signal); A step of receiving the LP-WUS after receiving the LP-SS through the first receiver of the terminal based on the above parameters; and A step of operating a second receiver of the terminal that has been stopped operating based on reception of the LP-WUS; The above parameter includes information on at least one of a ratio of the transmission power of the LP-SS to the transmission power of the PSS (Primary Synchronization Signal), a ratio of the transmission power of the LP-WUS to the transmission power of the PSS, a ratio of the transmission power of the LP-SS to the transmission power of the SSS (Secondary Synchronization Signal), and a ratio of the transmission power of the LP-WUS to the transmission power of the SSS. method.

2. In paragraph 1, The ratio of the transmission power of the LP-SS to the transmission power of the PSS, the ratio of the transmission power of the LP-WUS to the transmission power of the PSS, the ratio of the transmission power of the LP-SS to the transmission power of the SSS, and the ratio of the transmission power of the LP-WUS to the transmission power of the SSS are each set to one of -3 dB, 0 dB, 3 dB, and 6 dB compared to a reference signal. method.

3. In paragraph 1, Based on the cyclic shift value used in the above LP-SS, a part of the PCI (Physical Cell Identifier) ​​of the cell from which the LP-SS is received is obtained. method.

4. In paragraph 3, A part of the above PCI is equal to a value obtained by modulo calculating the PCI by the length of the sequence of the LP-SS. method.

5. In paragraph 1, Based on the resource location where the LP-SS is received, the PCI (Physical Cell Identifier) ​​of the cell where the LP-SS is received is obtained. method.

6. In paragraph 1, Based on the resource location where the LP-WUS is received, the PCI (Physical Cell Identifier) ​​of the cell where the LP-WUS is received is obtained. method.

7. In paragraph 1, The above parameters are received via RRC (Radio Resource Control) signaling or SIB (System Information Block) before the second receiver is stopped. method.

8. In a terminal operating in a wireless communication system, First receiver and second receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of receiving parameters related to transmission power of LP-SS (Low Power-Synchronization Signal) and LP-WUS (Low Power-Wake Up Signal); A step of receiving the LP-WUS after receiving the LP-SS through the first receiver of the terminal based on the above parameters; and A step of operating a second receiver of the terminal that has been stopped operating based on reception of the LP-WUS; The above parameter includes information on at least one of a ratio of the transmission power of the LP-SS to the transmission power of the PSS (Primary Synchronization Signal), a ratio of the transmission power of the LP-WUS to the transmission power of the PSS, a ratio of the transmission power of the LP-SS to the transmission power of the SSS (Secondary Synchronization Signal), and a ratio of the transmission power of the LP-WUS to the transmission power of the SSS. Terminal.

9. In a device for a terminal, at least one processor; and At least one computer memory operably connected to said at least one processor and configured to, when executed, cause said at least one processor to perform operations, said operations comprising: A step of receiving parameters related to transmission power of LP-SS (Low Power-Synchronization Signal) and LP-WUS (Low Power-Wake Up Signal); A step of receiving the LP-WUS after receiving the LP-SS through the first receiver of the terminal based on the above parameters; and A step of operating a second receiver of the terminal that has been stopped operating based on reception of the LP-WUS; The above parameter includes information on at least one of a ratio of the transmission power of the LP-SS to the transmission power of the PSS (Primary Synchronization Signal), a ratio of the transmission power of the LP-WUS to the transmission power of the PSS, a ratio of the transmission power of the LP-SS to the transmission power of the SSS (Secondary Synchronization Signal), and a ratio of the transmission power of the LP-WUS to the transmission power of the SSS. device.

10. A computer-readable non-volatile storage medium comprising at least one computer program that causes a terminal including at least one processor to perform an operation, the operation comprising: A step of receiving parameters related to transmission power of LP-SS (Low Power-Synchronization Signal) and LP-WUS (Low Power-Wake Up Signal); A step of receiving the LP-WUS after receiving the LP-SS through the first receiver of the terminal based on the above parameters; and A step of operating a second receiver of the terminal that has been stopped operating based on reception of the LP-WUS; The above parameter includes information on at least one of a ratio of the transmission power of the LP-SS to the transmission power of the PSS (Primary Synchronization Signal), a ratio of the transmission power of the LP-WUS to the transmission power of the PSS, a ratio of the transmission power of the LP-SS to the transmission power of the SSS (Secondary Synchronization Signal), and a ratio of the transmission power of the LP-WUS to the transmission power of the SSS. Storage media.

11. In a method performed by a base station in a wireless communication system, A step of setting the transmission power of LP-SS (Low Power-Synchronization Signal) and LP-WUS (Low Power-Wake Up Signal) for the first receiver of the terminal; a step of transmitting parameters related to the above transmission power; and A step of transmitting the LP-WUS after transmitting the LP-SS based on the above transmission power; The above parameter includes information on at least one of a ratio of the transmission power of the LP-SS to the transmission power of the PSS (Primary Synchronization Signal), a ratio of the transmission power of the LP-WUS to the transmission power of the PSS, a ratio of the transmission power of the LP-SS to the transmission power of the SSS (Secondary Synchronization Signal), and a ratio of the transmission power of the LP-WUS to the transmission power of the SSS. method.

12. In paragraph 11, The ratio of the transmission power of the LP-SS to the transmission power of the PSS, the ratio of the transmission power of the LP-WUS to the transmission power of the PSS, the ratio of the transmission power of the LP-SS to the transmission power of the SSS, and the ratio of the transmission power of the LP-WUS to the transmission power of the SSS are each set to one of -3 dB, 0 dB, 3 dB, and 6 dB compared to a reference signal. method.

13. In paragraph 1, The cyclic shift value used for the LP-SS is determined based on a portion of the PCI (Physical Cell Identifier) ​​of the cell in which the LP-SS is transmitted. method.

14. In paragraph 13, A part of the above PCI is equal to a value obtained by modulo calculating the PCI by the length of the sequence of the LP-SS. method.

15. In paragraph 1, The resource location where the LP-SS is transmitted is determined based on the PCI (Physical Cell Identifier) ​​of the cell where the LP-SS is transmitted. method.

16. In paragraph 1, The resource location where the LP-WUS is transmitted is determined based on the PCI (Physical Cell Identifier) ​​of the cell where the LP-WUS is transmitted. method.

17. In paragraph 1, The above parameters are transmitted via RRC (Radio Resource Control) signaling or SIB (system information block) before the second receiver of the terminal is stopped. method.

18. In a base station operating in a wireless communication system, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of setting the transmission power of LP-SS (Low Power-Synchronization Signal) and LP-WUS (Low Power-Wake Up Signal) for the first receiver of the terminal; a step of transmitting parameters related to the above transmission power; and A step of transmitting the LP-WUS after transmitting the LP-SS based on the above transmission power; The above parameter includes information on at least one of a ratio of the transmission power of the LP-SS to the transmission power of the PSS (Primary Synchronization Signal), a ratio of the transmission power of the LP-WUS to the transmission power of the PSS, a ratio of the transmission power of the LP-SS to the transmission power of the SSS (Secondary Synchronization Signal), and a ratio of the transmission power of the LP-WUS to the transmission power of the SSS. Base station.

Images