Method and device for switching reception mode using low power receiver

Abstract

Provided are a method and a device for switching a reception mode using a low power receiver. A base station determines a priority operation of a low power wake-up receiver (LR) mode of a terminal and transmits, to the terminal, LR-related configuration information for low power wake-up signal (LP WUS) monitoring. The terminal performs low power wake-up signal (LP WUS) monitoring through an LR receiver on the basis of the LR-related configuration information received from the base station. Here, the LR-related configuration information includes an indicator indicating a priority operation of an LR mode among a main radio transceiver (MR) mode and the LR mode.

Description

Method and device for switching reception modes using a low-power receiver

[0001] This specification relates to wireless communications applicable to 5G NR, 5G-Advanced and 6G.

[0002] As more and more communication devices demand ever-increasing communication traffic, the need for next-generation 5G systems, which offer enhanced wireless broadband communication capabilities over existing LTE systems, is growing. This next-generation 5G system, known as NewRAT, differentiates communication scenarios into Enhanced Mobile BroadBand (eMBB), Ultra-reliability and low-latency communication (URLLC), and Massive Machine-Type Communications (mMTC).

[0003] Here, eMBB is a next-generation mobile communication scenario with characteristics such as High Spectrum Efficiency, High User Experienced Data Rate, and High Peak Data Rate; URLLC is a next-generation mobile communication scenario with characteristics such as Ultra Reliable, Ultra Low Latency, and Ultra High Availability (e.g., V2X, Emergency Service, and Remote Control); and mMTC is a next-generation mobile communication scenario with characteristics such as Low Cost, Low Energy, Short Packet, and Massive Connectivity (e.g., IoT).

[0004] An object of the present specification is to provide a method and device for switching a reception mode from a main radio transceiver (MR) to a low power wake up receiver (LR) of a terminal in a wireless communication system to minimize power consumption.

[0005] One embodiment of the present specification provides a method for a wireless communication system in which a terminal receives low power wake up receiver (LR) related configuration information from a base station, and performs LP WUS (Low Power Wake Up Signal) monitoring through the LR receiver based on the received LR related configuration information, wherein the LR related configuration information includes an indicator that indicates priority operation of the LR mode among the main radio transceiver (MR) mode and the LR mode.

[0006] In addition, one embodiment of the present specification provides a method in which, in a wireless communication system, a base station determines a priority operation of a low power wake up receiver (LR) mode of a terminal and transmits LR-related configuration information for LP WUS (Low Power Wake Up Signal) monitoring to the terminal, wherein the LR-related configuration information includes an indicator that indicates priority operation of the LR mode among the main radio transceiver (MR) mode and the LR mode of the terminal.

[0007] In addition, one embodiment of the present specification provides a communication device in a wireless communication system, including at least one processor, and at least one memory storing instructions and being operably electrically connectable to the at least one processor, wherein the operations performed based on the instructions being executed by the at least one processor include: receiving low power wake up receiver (LR) related configuration information, and performing LP WUS (Low Power Wake Up Signal) monitoring through the LR receiver based on the received LR related configuration information, wherein the LR related configuration information includes an indicator that indicates a priority operation of the LR mode among a main radio transceiver (MR) mode and an LR mode.

[0008] In addition, one embodiment of the present specification provides a base station in a wireless communication system, comprising at least one processor, and at least one memory storing instructions and being operably electrically connectable to the at least one processor, wherein the operations performed based on the instructions being executed by the at least one processor are: determining a priority operation of a low power wake up receiver (LR) mode of a terminal, and transmitting LR-related configuration information for LP WUS (Low Power Wake Up Signal) monitoring to the terminal, wherein the LR-related configuration information includes an indicator that indicates a priority operation of the LR mode among a main radio transceiver (MR) mode and an LR mode of the terminal.

[0009] The above LR-related configuration information can be transmitted and received via an RRC (Radio Resource Control) message. In addition, PDCCH (physical downlink control channel) monitoring based on LP WUS can be enabled or disabled by the above LR-related configuration information.

[0010] Meanwhile, the performance of LP WUS monitoring may be further based on at least one of the expiration of a power saving-related timer and the reception of a signal indicating power saving. To this end, at least one of the transmission of power saving-related timer information and the transmission of a signal indicating power saving for LP WUS monitoring may be performed by the base station.

[0011] The above power saving related timer may be a data inactivity or DRX (discontinuous reception) inactivity timer, and the signaling indicating the power saving may be done through an RRC release message.

[0012] Additionally, assistance information may be transmitted from the terminal to the base station, and based on this, an indicator indicating priority operation of the LR mode may be included in the LR-related configuration information.

[0013] According to the disclosure of this specification, when a terminal supporting the function of monitoring a downlink signal using only an ultra-low power receiver separate from an MR transceiver such as NR performs a transition from MR to LR, a method is proposed to clearly establish a relationship between the existing DRX mode and LR, thereby enabling a power saving mode suitable for the situation of the terminal to be set.

[0014] Figure 1 is a diagram illustrating a wireless communication system.

[0015] Figure 2 illustrates the structure of a radio frame used in NR.

[0016] Figures 3a to 3c are exemplary diagrams showing exemplary architectures for wireless communication services.

[0017] Figure 4 illustrates the slot structure of an NR frame.

[0018] Figure 5 illustrates an example of subframe types in NR.

[0019] Figure 6 illustrates the structure of a self-contained slot.

[0020] FIG. 7 is a diagram for explaining an exemplary operation of a terminal configured with a low power-wake up receiver (LP-WUR / LR).

[0021] Figures 8a to 8c illustrate state transitions of a terminal according to embodiments of the present specification.

[0022] Figure 9 illustrates an operation method of a terminal according to one embodiment of the present specification.

[0023] Figure 10 illustrates a procedure of a terminal and a base station according to one embodiment of the present specification.

[0024] Figure 11 illustrates a procedure of a terminal and a base station according to another embodiment of the present specification.

[0025] Figure 12 illustrates a procedure of a terminal and a base station according to another embodiment of the present specification.

[0026] Figure 13 illustrates a procedure of a terminal and a base station according to another embodiment of the present specification.

[0027] Figure 14 illustrates an operation method of a terminal according to another embodiment of the present specification.

[0028] Figure 15 illustrates an operation method of a base station according to one embodiment of the present specification.

[0029] Figure 16 illustrates a device according to one embodiment of the present specification.

[0030] Fig. 17 is a block diagram showing the configuration of a terminal according to one embodiment of the present specification.

[0031] Figure 18 shows a block diagram of a processor in which the disclosure of this specification is implemented.

[0032] FIG. 19 is a block diagram showing in detail the transmitter / receiver of the first device illustrated in FIG. 16 or the transmitter / receiver unit of the device illustrated in FIG. 17.

[0033] It should be noted that the technical terms used in this specification are used merely to describe specific embodiments and are not intended to limit the contents of this specification. In addition, unless specifically defined otherwise herein, the technical terms used in this specification should be interpreted as having a meaning generally understood by those skilled in the art to which this specification pertains, and should not be interpreted in an excessively broad or narrow sense. In addition, if a technical term used in this specification is an incorrect technical term that does not accurately express the contents and ideas of this specification, it should be replaced with a technical term that can be correctly understood by a person skilled in the art. In addition, general terms used in this specification should be interpreted according to their dictionary definitions or according to the preceding and following context, and should not be interpreted in an excessively narrow sense.

[0034] Additionally, the singular expressions used herein include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consist of" or "have" should not be construed to necessarily include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0035] Additionally, terms including ordinal numbers, such as "first" and "second," used herein may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a second component, and similarly, a second component could also be referred to as a first component.

[0036] When a component is referred to as being connected or connected to another component, it may be directly connected or connected to that other component, but there may also be other components intervening. Conversely, when a component is referred to as being directly connected or connected to another component, it should be understood that there are no other components intervening.

[0037] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing reference numerals, identical or similar components will be given the same reference numerals, and redundant descriptions thereof will be omitted. In addition, when describing the contents of this specification, if a detailed description of a related known technology is judged to obscure the gist of this specification, the detailed description thereof will be omitted. In addition, it should be noted that the attached drawings are only intended to make the contents and ideas of this specification easily understandable, and should not be construed as limiting the contents and ideas of this specification by the attached drawings. The contents and ideas of this specification should be construed to extend to all changes, equivalents, and substitutes other than the attached drawings.

[0038] In this specification, “A or B” can mean “only A,” “only B,” or “both A and B.” In other words, “A or B” in this specification can be interpreted as “A and / or B.” For example, “A, B or C” in this specification can mean “only A,” “only B,” “only C,” or “any combination of A, B, and C.”

[0039] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Accordingly, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0040] In this specification, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” Additionally, in this specification, the expressions “at least one of A or B” or “at least one of A and / or B” may be interpreted identically to “at least one of A and B.”

[0041] Additionally, in this specification, “at least one of A, B and C” can mean “only A,” “only B,” “only C,” or “any combination of A, B and C.” Additionally, “at least one of A, B or C” or “at least one of A, B and / or C” can mean “at least one of A, B and C.”

[0042] Additionally, parentheses used in this specification may mean “for example.” Specifically, when “control information (PDCCH)” is indicated, “PDCCH (Physical Downlink Control Channel)” may be suggested as an example of “control information.” In other words, “control information” in this specification is not limited to “PDCCH,” and “PDDCH” may be suggested as an example of “control information.” Furthermore, even when indicated as “control information (i.e., PDCCH),” “PDCCH” may be suggested as an example of “control information.”

[0043] Technical features individually described in a single drawing in this specification may be implemented individually or simultaneously.

[0044] Although the attached drawing illustrates a UE (User Equipment) as an example, the illustrated UE may also be referred to as a terminal, ME (Mobile Equipment), etc. In addition, the UE may be a portable device such as a laptop, mobile phone, PDA, smart phone, multimedia device, etc., or a non-portable device such as a PC or vehicle-mounted device.

[0045] Hereinafter, the term "UE" is used as an example of a device capable of wireless communication (e.g., a wireless communication device, a wireless device, or a wireless device). The operations performed by the UE can be performed by any device capable of wireless communication. A device capable of wireless communication may also be referred to as a wireless communication device, a wireless device, or a wireless device.

[0046] The term base station used below generally refers to a fixed station that communicates with wireless devices, and can be used as a comprehensive term that includes eNodeB (evolved-NodeB), eNB (evolved-NodeB), BTS (Base Transceiver System), Access Point, gNB (Next generation NodeB), RRH (remote radio head), TP (transmission point), RP (reception point), relay, etc.

[0047] Although this specification describes embodiments using LTE systems, LTE-A systems, and NR systems, these embodiments may be applied to any communication system falling within the above definitions.

[0048] Wireless Communication System

[0049] Building on the success of LTE (long term evolution) / LTE-Advanced (LTE-A) for 4th generation mobile communications, commercialization of the next generation, or 5th generation (so-called 5G) mobile communications, and follow-up research are also ongoing.

[0050] The International Telecommunication Union (ITU) defines 5G mobile communications as providing data transfer speeds of up to 20 Gbps and a perceived transmission speed of at least 100 Mbps everywhere. Its official name is "IMT-2020."

[0051] ITU proposes three usage scenarios: eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communications).

[0052] URLLC addresses usage scenarios that require high reliability and low latency. For example, services such as autonomous driving, factory automation, and augmented reality require high reliability and low latency (e.g., sub-1ms). Current 4G (LTE) latency is statistically 21-43ms (best 10%) and 33-75ms (median). This is insufficient to support services requiring sub-1ms latency. Next, eMBB usage scenarios address usage scenarios that require mobile ultra-wideband.

[0053] In other words, the 5th generation mobile communication system can support higher capacity than the current 4G LTE, increase the density of mobile broadband users, and support D2D (Device to Device), high reliability, and MTC (Machine-type communication). 5G research and development also aims for lower latency and lower battery consumption than 4G mobile communication systems to better implement the Internet of Things. For this 5G mobile communication, a new radio access technology (New RAT or NR) may be proposed.

[0054] The NR frequency band can be defined by two types of frequency ranges (FR1, FR2). The numerical values ​​of the frequency ranges can be changed, and for example, the two types of frequency ranges (FR1, FR2) can be as shown in Table 1 below. For convenience of explanation, among the frequency ranges used in the NR system, FR1 can mean the “sub 6 GHz range”, and FR2 can mean the “above 6 GHz range” and can be called millimeter wave (mmW).

[0055] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0056] The numerical value of the frequency range of the NR system can be changed. For example, FR1 can include a band from 410 MHz to 7125 MHz, as shown in Table 1. That is, FR1 can include frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included within FR1 can include unlicensed bands. Unlicensed bands can be used for various purposes, such as for communications for vehicles (e.g., autonomous driving).

[0057] Meanwhile, 3GPP-based communication standards define downlink physical channels corresponding to resource elements that carry information originating from upper layers, and downlink physical signals corresponding to resource elements that are used by the physical layer but do not carry information originating from upper layers. For example, the physical downlink shared channel (PDSCH), physical broadcast channel (PBCH), physical multicast channel (PMCH), physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), and physical hybrid ARQ indicator channel (PHICH) are defined as downlink physical channels, and reference signals and synchronization signals are defined as downlink physical signals. A reference signal (RS), also referred to as a pilot, is a signal with a special predefined waveform known to the gNB and the UE. For example, cell specific RS, UE-specific RS (UE-RS), positioning RS (PRS), and channel state information RS (CSI-RS) are defined as downlink reference signals. The 3GPP LTE / LTE-A standard defines uplink physical channels corresponding to resource elements carrying information originating from higher layers, and uplink physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers.For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are defined as uplink physical channels, and a demodulation reference signal (DMRS) for uplink control / data signals and a sounding reference signal (SRS) used for uplink channel measurement are defined.

[0058] In this specification, PDCCH (Physical Downlink Control CHannel) / PCFICH (Physical Control Format Indicator CHannel) / PHICH ((Physical Hybrid automatic retransmit request Indicator CHannel) / PDSCH (Physical Downlink Shared CHannel) mean a set of time-frequency resources or a set of resource elements that carry DCI (Downlink Control Information) / CFI (Control Format Indicator) / downlink ACK / NACK (ACKnowlegement / Negative ACK) / downlink data, respectively. In addition, PUCCH (Physical Uplink Control CHannel) / PUSCH (Physical Uplink Shared CHannel) / PRACH (Physical Random Access CHannel) mean a set of time-frequency resources or a set of resource elements that carry UCI (Uplink Control Information) / uplink data / random access signals, respectively.

[0059] Figure 1 is a diagram illustrating a wireless communication system.

[0060] As can be seen from FIG. 1, the wireless communication system includes at least one base station (BS). The BS is divided into a gNodeB (or gNB) (20a) and an eNodeB (or eNB) (20b). The gNB (20a) supports 5th generation mobile communications. The eNB (20b) supports 4th generation mobile communications, i.e., long term evolution (LTE).

[0061] Each base station (20a and 20b) provides communication services for a specific geographic area (commonly referred to as a cell) (20-1, 20-2, 20-3). The cell may be further divided into multiple areas (referred to as sectors).

[0062] A UE (user equipment) typically belongs to a single cell, and the cell to which the UE belongs is called a serving cell. The base station that provides communication services for the serving cell is called a serving base station (BS). Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. These other cells adjacent to the serving cell are called neighbor cells. The base station that provides communication services to the neighbor cell is called a neighbor BS. The serving cell and neighbor cells are determined relative to the UE.

[0063] Hereinafter, downlink refers to communication from a base station (20) to a UE (10), and uplink refers to communication from a UE (10) to a base station (20). In downlink, the transmitter may be part of the base station (20), and the receiver may be part of the UE (10). In uplink, the transmitter may be part of the UE (10), and the receiver may be part of the base station (20).

[0064] Meanwhile, wireless communication systems can be broadly divided into frequency division duplex (FDD) and time division duplex (TDD). In FDD, uplink and downlink transmissions occupy different frequency bands and occur at different times. In TDD, uplink and downlink transmissions occupy the same frequency band but occur at different times. The channel response in TDD is essentially reciprocal, meaning that the downlink and uplink channel responses are nearly identical in a given frequency range. Therefore, in TDD-based wireless communication systems, the downlink channel response can be derived from the uplink channel response. In TDD, uplink and downlink transmissions are time-divided across the entire frequency band, so downlink transmission by the base station and uplink transmission by the UE cannot be performed simultaneously. In TDD systems, where uplink and downlink transmissions are divided into subframes, uplink and downlink transmissions are performed in different subframes.

[0065] Figure 2 illustrates the structure of a radio frame used in NR.

[0066] In NR, uplink and downlink transmissions are structured as frames. A radio frame is 10ms long and is defined by two 5ms half-frames (HF). Each half-frame is defined by 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 a normal CP is used, each slot contains 14 symbols. When an extended CP is used, each slot contains 12 symbols. Here, the symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

[0067] Support for various numerologies

[0068] In NR systems, multiple numerologies may be provided to terminals as wireless communication technologies advance. For example, an SCS of 15 kHz supports a wide area in traditional cellular bands. An SCS of 30 kHz / 60 kHz supports dense urban environments, lower latency, and wider carrier bandwidth. An SCS of 60 kHz or higher supports a bandwidth greater than 24.25 GHz to overcome phase noise.

[0069] The above numerology can be defined by the cycle prefix (CP) length and subcarrier spacing (SCS). A single cell can provide multiple numerologies to a terminal. When the numerology index is represented by μ, each subcarrier spacing and the corresponding CP length can be as shown in the table below.

[0070] μ△f=2 μ 15 [kHz]CP015 General 130 General 260 General, Extended 3120 General 4240 General 5480 General 6960 General

[0071] For general CP, when the index of the numerology is represented by μ, the number of OFDM symbols per slot (N slot symb ), number of slots per frame (N frame,μ slot ) and the number of slots per subframe (N subframe,μ slot ) is as shown in the table below.

[0072] μ△f=2 μ 15 [kHz]N slot symb N frame,μ slot N subframe,μ slot 015141011301420226014404312014808424014160165480143203269601464064

[0073] For extended CP, when the index of the numerology is represented by μ, the number of OFDM symbols per slot (N slot symb ), number of slots per frame (N frame,μ slot ) and the number of slots per subframe (N subframe,μ slot ) is as shown in the table below.

[0074] μSCS (15*2 u )N slot symb N frame,μ slot N subframe,μslot 260KHz (u=2)12404

[0075] In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, etc.) may be configured differently across multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as a TU (Time Unit)) consisting of the same number of symbols may be configured differently across the merged cells.

[0076] Figures 3a to 3c are exemplary diagrams showing exemplary architectures for wireless communication services.

[0077] Referring to FIG. 3a, the UE is connected to an LTE / LTE-A-based cell and an NR-based cell in a DC (dual connectivity) manner.

[0078] The above NR-based cell is connected to the core network for existing 4th generation mobile communication, i.e. Evolved Packet Core (EPC).

[0079] Referring to FIG. 3b, unlike FIG. 3a, the LTE / LTE-A-based cell is connected to a core network for 5th generation mobile communication, i.e., a 5G core network.

[0080] A service method based on an architecture as illustrated in Figures 3a and 3b above is called NSA (non-standalone).

[0081] Referring to Figure 3c, the UE is connected only to NR-based cells. A service method based on this architecture is called SA (standalone).

[0082] Meanwhile, in the above NR, it may be considered that reception from the base station utilizes a downlink subframe, and transmission to the base station utilizes an uplink subframe. This method can be applied to paired and unpaired spectrums. A pair of spectrums means that two carrier spectrums are included for downlink and uplink operations. For example, in a pair of spectrums, one carrier may include a downlink band and an uplink band that are paired with each other.

[0083] Figure 4 illustrates the slot structure of an NR frame.

[0084] A slot contains multiple symbols in the time domain. For example, in the case of a normal CP, one slot contains 14 symbols, but in the case of 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. A BWP (Bandwidth Part) is defined as multiple consecutive (physical, P)RBs in the frequency domain, and can correspond to a single numerology (e.g., SCS, CP length, etc.). A terminal can be configured with up to N (e.g., 4) BWPs in the downlink and uplink, respectively. Downlink or uplink transmission is performed through an activated BWP, and at a given time, only one BWP among the BWPs configured for the terminal can be activated. In the resource grid, each element is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0085] Figure 5 illustrates an example of subframe types in NR.

[0086] The transmission time interval (TTI) illustrated in FIG. 5 may be referred to as a subframe or slot for NR (or new RAT). The subframe (or slot) of FIG. 5 may be used in a TDD system of NR (or new RAT) to minimize data transmission delay. As illustrated in FIG. 5, a subframe (or slot) includes 14 symbols. The symbols in the front of the subframe (or slot) may be used for a downlink (DL) control channel, and the symbols in the back of the subframe (or slot) may be used for an uplink (UL) control channel. The remaining symbols may be used for DL ​​data transmission or UL data transmission. According to this subframe (or slot) structure, downlink transmission and uplink transmission may be sequentially performed in one subframe (or slot). Therefore, downlink data may be received within a subframe (or slot), and an uplink acknowledgment (ACK / NACK) may be transmitted within the subframe (or slot).

[0087] The structure of these subframes (or slots) can be called self-contained subframes (or slots).

[0088] Specifically, the first N symbols in a slot are 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. For example, a physical downlink control channel (PDCCH) can be transmitted in the DL control region, and a physical downlink shared channel (PDSCH) can be transmitted in the DL data region. A physical uplink control channel (PUCCH) can be transmitted in the UL control region, and a physical uplink shared channel (PUSCH) can be transmitted in the UL data region.

[0089] Using this subframe (or slot) structure has the advantage of minimizing the final data transmission latency by reducing the time required to retransmit data that has experienced reception errors. In this self-contained subframe (or slot) structure, a time gap may be required during the transition from transmit mode to receive mode or from receive mode to transmit mode. To this end, some OFDM symbols during the transition from DL to UL in the subframe structure can be designated as a guard period (GP).

[0090] Figure 6 illustrates the structure of a self-contained slot.

[0091] In an NR system, a frame is characterized by a self-contained structure in which a DL control channel, DL or UL data, and a UL control channel can all be included within a single slot. For example, the first N symbols within a slot can be used to transmit a DL control channel (hereinafter, referred to as a DL control region), and the last M symbols within a slot can be used to transmit a UL control channel (hereinafter, referred to as a UL control region). N and M are each integers greater than or equal to 0. The resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. As an example, the following configuration can be considered. Each section is listed in chronological order.

[0092] 1. DL only configuration

[0093] 2. UL only configuration

[0094] 3. Mixed UL-DL configuration

[0095] - DL area + GP (Guard Period) + UL control area

[0096] - DL control area + GP + UL area

[0097] DL area: (i) DL data area, (ii) DL control area + DL data area

[0098] UL domain: (i) UL data domain, (ii) UL data domain + UL control domain

[0099] In the DL control region, a PDCCH can be transmitted, and in the DL data region, a PDSCH can be transmitted. In the UL control region, a PUCCH can be transmitted, and in the UL data region, a PUSCH can be transmitted. In the PDCCH, downlink control information (DCI), for example, DL data scheduling information, UL data scheduling information, etc., can be transmitted. In the PUCCH, uplink control information (UCI), for example, ACK / NACK (Positive Acknowledgement / Negative Acknowledgement) information for DL ​​data, CSI (Channel State Information) information, SR (Scheduling Request), etc., can be transmitted. GP provides a time gap when a base station and a terminal switch from transmission mode to reception mode or when switching from reception mode to transmission mode. Some symbols at the time of switching from DL to UL within a subframe can be set as GP.

[0100] FIG. 7 is a diagram for explaining an exemplary operation of a terminal configured with a low power-wake up receiver (LP-WUR / LR).

[0101] In the case of DRX (discontinuous reception) applied in NR, long sleep durations must be utilized to minimize power consumption of the terminal. While long-duration DRX operation provides a way to minimize power consumption of the terminal, it is difficult to satisfy the delay requirements of terminals that require low latency. To support terminals that require both low latency and low power, a method is required that allows the terminal to receive a wake-up signal from the base station while consuming only minimal power even in short-duration or always-ON state. To this end, an ultra-low-power receiver that can be installed separately from the conventional transceiver has been introduced, and 3GPP is currently studying ways to define the architecture and operation of the receiver. The receiver to be defined here is a receiver that can receive only the wake-up signal and the essential signals related thereto, and is defined as a receiver separate from the transceiver used for conventional data transmission and reception. When the terminal enters deep sleep mode or low power WUR (wake-up receiver) mode, the transceiver (i.e., Main Radio, MR Tx / Rx module) used for transmitting and receiving NR signals / channels is turned OFF (or PDCCH monitoring is stopped), and only the LR (LP wake-up receiver) is turned ON to receive the wake-up signal and the essential signals related thereto through the LR receiver, thereby expected to drastically reduce the power consumption of the terminal.At this time, a terminal that receives a wake-up signal through the corresponding receiver (LR, Low power wakeup Receiver) can be instructed to switch to MR (main radio) mode, and the terminal that receives this instruction can switch the mode from LR to MR and perform communication through a transceiver for existing NR data transmission and reception. Fig. 7 schematically shows the operation of a terminal configured with LR as described above.

[0102] Research to date in 3GPP has primarily focused on the design and reception of the wake-up signal (WUS), a transition method from LR to MR mode. However, research on transition methods from MR to LR mode and the potential issues that may arise when LR is defined together with legacy MR power-saving technologies has been lacking. Specific procedures for low-power receiver (LPR) operations are expected to be determined in a future work item (WI).

[0103] Terminals operating in LR (Low Power Wake-up Receiver, LP-WUR) mode are receivers separate from existing NR transceivers. 3GPP has decided to define a new technology suitable for low-power receivers. Research on LR mode operation is currently underway, but specific details will be defined in the future WI phase.

[0104] For LR UEs, power consumption is minimized through a low power receiver in both connected and idle / inactive states, and the downlink channel can be monitored through the LR receiver. However, with the advent of LR UEs, there has been a need for discussion on the relationship between existing power saving technologies and low power receivers, but such discussion has been insufficient. For example, when a UE in an RRC connected state in MR mode transitions to an idle or inactive state, there is no definition as to whether it should transition directly to LR IDLE / INACTIVE or whether it is preferable to transition to the conventional IDLE / INACTIVE state. In addition, when an RRC connected UE with LR capability receives DRX-related configuration, there is no specific method for transitioning from MR to LR, such as whether it should perform DRX operation upon expiration of the DRX inactivity timer or whether it can enter LR mode directly.

[0105] The present invention proposes a method for switching from MR to LR of connected UE and idle / inactive UE based on the aforementioned contents and a method for defining the relationship between existing power saving technology and LR mode.

[0106] In addition, the present invention proposes a method for switching a mode to a low power receiver, i.e., LR, while a terminal that wants to minimize power consumption is performing communication using a main radio transceiver (MR) by using LR (low power wake up receiver).

[0107] Figures 8a to 8c illustrate state transitions of a terminal according to embodiments of the present specification.

[0108] Figure 8a shows the state transition of a terminal that applies only a low-power receiver, i.e., an LR receiver, Figure 8b shows the state transition of a terminal that applies both legacy PS (power saving) technology and a low-power receiver, and Figure 8c shows the state transition of a terminal that applies only legacy PS (power saving) technology.

[0109] One disclosure of this specification proposes defining an indicator (e.g., lowPowerReceiver_priority) that instructs the terminal to operate in LR mode first when power saving is required, so that a terminal configured with both legacy power saving (PS) and LR receiver functions can apply the two technologies appropriately depending on the situation.

[0110] Specifically, as illustrated in FIG. 8a, a terminal that has received the aforementioned indicator, if a power saving mode is required, is configured to first enter the LR mode in which LP WUS reception is performed via the LR receiver, instead of entering the legacy power saving (PS) mode (i.e., MR IDLE / INACTIVE, MR C_DRX) (i.e., MR DRX mode deactivation). If a terminal supporting an LR receiver has not received the aforementioned indicator, the terminal may be defined to perform a step-by-step entry, such as performing the legacy PS technique in the MR mode and then operating as an LR receiver only by an additional event (e.g., LR activation or LR related timer) (FIG. 8b), or may be defined to use only the PS technique in the MR mode without applying the power saving technique via the LR receiver (FIG. 8c).

[0111] In Fig. 8a, the state transition of a terminal when instructed to operate in LR priority mode by an indicator proposed in this specification is shown, and DRX-related operations that could be performed in MR are deactivated. That is, C-DRX (Connected Mode-Discontinuous Reception) and P-DRX (Paging-Discontinuous Reception) are deactivated. In this case, when entering PS mode through the expiration of the related timer and the instruction to transition to PS, the terminal immediately performs LP-WUS monitoring appropriate to its RRC state through the LR receiver.

[0112] In Fig. 8b, the state transition of a terminal when the indicator proposed in this specification is not set for a terminal supporting the LR mode function is shown, which may correspond to a case where the terminal receives both the conventional DRX configuration and the LR configuration from the base station. In this case, as shown in Fig. 8b, both the conventional DRX mode and the LR mode of the MR are activated. That is, the conventional DRX-related timer expiration and IDLE / INACTIVE state transition message causes the terminal to perform the conventional C_DRX and P_DRX, and during this, additional signaling (LR activation) or definition of an additional timer for LR can enable a stepwise entry into the LR mode appropriate to the RRC state of the terminal.

[0113] Fig. 8c illustrates another state transition of a terminal when the indicator proposed in this specification is not set for a terminal supporting the LR mode function. Here, the terminal receives the conventional DRX configuration from the base station. The state transition of the terminal in Fig. 8c may be independent of whether or not the LR configuration is received. That is, even if the terminal supports the LR function, if the terminal has not received the indicator proposed in this specification, only the conventional DRX mode of the MR is activated as shown in Fig. 8c. This means that even if the terminal has received LR-related configuration information from the base station, if it has not received a message including the indicator proposed in this specification, the terminal performs only the conventional C_DRX and P_DRX according to the reception of the DRX and state transition messages.

[0114] Figure 9 illustrates an operation method of a terminal according to one embodiment of the present specification.

[0115] Referring to FIG. 9, the terminal receives a message from the base station including an indicator indicating priority of the LR mode (S901). Thereafter, based on the received indicator, the terminal switches to a power saving mode using the LR receiver (S902).

[0116] Depending on the message including the directive proposed in this specification, i.e., the directive indicating priority of LR mode, the following methods may be applied and operated.

[0117] i) Terminal-based LR application

[0118] ii) Procedure-based LR application

[0119] iii) Applying LR based on data type

[0120] Below, i) a method for applying terminal-based LR is described.

[0121] A terminal with LR function can notify a base station that it is a terminal supporting an LR receiver through UE capability information. In this case, the indicator proposed in this specification can be transmitted from the terminal to the base station through the UE capability information. Alternatively, a base station that has received the LR receiver capability of the UE can include the indicator proposed in this specification in an RRC message / information (e.g., LR-Config IE) that transmits power saving mode-related information. When a terminal that has transmitted or received the indicator enters PS mode, it performs downlink monitoring by preferentially using the LR receiver. That is, when the terminal receives an RRC release message or the data inactivity timer (DataInactivityTimer) expires, it switches to the LR IDLE state and performs LP WUS monitoring through LR in the IDLE state. Alternatively, if the UE receives an RRC release message containing suspendConfig, it transitions to LR INACTIVE state and performs LP WUS monitoring through LR in the inactive state. If the drx-InactivityTimer of the UE expires, it will perform LP WUS monitoring through LR in the connected state instead of entering short / long DRX. The above-described behavior means that the parameters previously used for transitioning to power saving mode can be replaced with indicators for mode transition from MR to LR. Alternatively, if a new timer for entering LR is defined in the LR-related configuration information, a new LR_dataInactivityTimer can be defined for transitioning to LR IDLE, or a new lr-InactivityTimer can be defined for transitioning to LR CONNECTED.LR_dataInactivityTimer is (re)started when transmitting or receiving a MAC SDU, like the conventional dataInactivityTimer, and switches to LR IDLE when it expires, and lr-InactivityTimer is (re)started when receiving a PDCCH, like the conventional drx-InactivityTimer, and switches to LR CONNECTED mode when it expires.

[0122] Figure 10 illustrates a procedure of a terminal and a base station according to one embodiment of the present specification.

[0123] Figure 10 shows the procedure of the terminal and base station for the method of applying the terminal-based LR described above i).

[0124] Hereinafter, terminal operation is described in detail with reference to FIG. 10.

[0125] The terminal (UE) transmits its capability information to the base station (S1001). At this time, at least one of the following pieces of information may be included.

[0126] - Low Power Receiver support indicator

[0127] - Low Power Receiver Priority (LPReceiver_priority)

[0128] Thereafter, the terminal receives LR-related configuration information from the base station (S1002). At this time, the following information may be included regarding the LP receiver.

[0129] - Low Power Receiver Priority (LPReceiver_priority): An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0130] Meanwhile, the terminal performs data transmission and reception with the base station via MR (S1003) and receives an RRC release message from the base station (S1004). The terminal with the low-power receiver priority (LPReceiver_priority) set switches to IDLE mode (S1005) and performs LP WUS monitoring via the LR receiver based on previously received LR-related configuration information (S1006). Here, the MR transceiver may be turned OFF.

[0131] Hereinafter, the operation of the base station is described in detail with reference to FIG. 10.

[0132] The base station receives capability information from the terminal (UE) (S1001). At this time, at least one of the following pieces of information may be included.

[0133] - Low Power Receiver support indicator

[0134] - Low Power Receiver Priority (LPReceiver_priority)

[0135] Thereafter, the base station transmits LR-related configuration information based on the capability information received from the terminal (S1002). At this time, the following information regarding the LP receiver may be included.

[0136] - Low Power Receiver Priority (LPReceiver_priority): An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0137] Meanwhile, the base station performs data transmission and reception with the terminal via MR (S1003), and if the base station decides to switch the terminal to IDLE mode, it transmits an RRC release message to the terminal (S1004). Additionally, the base station can transmit the terminal's LPReceiver_priority information to the AMF (Access and Mobility Management Function).

[0138] Next, ii) we describe a method for applying procedure-based LR.

[0139] This is a method in which LR entry can be selectively / dynamically instructed by the base station based on conventional methods in which the terminal can enter a power saving mode. That is, the base station can include an indicator (e.g., lowPowerReceiver_priority) to give priority to LP-WUS monitoring through the LR receiver in a message (e.g., RRC release message) instructing entry into the conventional PS (power saving) technology (IDLE / INACTIVE / C_DRX) or a message setting a timer related thereto (e.g., dataInactivityTimer, drx_InactivityTimer). That is, a terminal that receives an RRC release message including the indicator proposed in this specification switches to LR IDLE or INACTIVE mode and performs LP-WUS monitoring through the LR receiver. If a terminal supporting the LR receiver function receives an RRC release message that does not include the above indicator, this means switching to an Idle / Inactive state using MR as in the conventional technology. The above indicator may be included in an RRC message that sets a value for DataInactivityTimer or drx-InactivityTimer. If DataInactivityTimer is set with the above indicator, the terminal transitions to LR IDLE when DataInactivityTimer expires and performs LP WUS monitoring using the LR receiver. In addition, if drx-InactivityTimer is set with the above indicator, when the timer expires, the terminal performs LP WUS monitoring via the LR receiver instead of operating in the conventional short / long DRX mode.In the method of applying procedure-based LR, if the above indicator is not set for DataInactivityTimer, it means that the terminal performs paging message monitoring through MR when the timer expires, and if the above indicator is not set for drx-InactivityTimer, it means that the terminal enters short or long DRX mode through MR when the timer expires. Depending on the definition thereafter, it may be possible to enter step-by-step LR mode by additional indicators and timers, or it may operate in MR DRX only mode.

[0140] Figure 11 illustrates a procedure of a terminal and a base station according to another embodiment of the present specification.

[0141] In Fig. 11, in the method of applying the procedure-based LR described above (ii), the terminal switches the state by receiving an RRC release message.

[0142] Hereinafter, terminal operation is described in detail with reference to FIG. 11.

[0143] The terminal transmits and receives data with the base station via MR (S1101), and receives an RRC release message including the following information from the base station (S1102).

[0144] - Low Power Receiver Priority (LPReceiver_priority): An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0145] Afterwards, the terminal switches to IDLE mode (S1103) and performs LP WUS monitoring via the LR receiver (S1104). Here, the MR transceiver may be turned OFF.

[0146] Hereinafter, the operation of the base station is specifically described with reference to FIG. 11.

[0147] The base station performs data transmission and reception through the MR of the terminal (S1101), and when the base station decides to switch the terminal to LR IDLE mode, it transmits an RRC release message including the following information (S1102).

[0148] - Low Power Receiver Priority (LPReceiver_priority): An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0149] Additionally, the base station can transmit the terminal's LPReceiver_priority information to the AMF (Access and Mobility Management Function).

[0150] Figure 12 illustrates a procedure of a terminal and a base station according to another embodiment of the present specification.

[0151] In Fig. 12, in the method of applying the procedure-based LR described above (ii), the terminal switches states upon expiration of drx-InacitivityTimer.

[0152] Hereinafter, terminal operation is described in detail with reference to FIG. 12.

[0153] The terminal receives an RRC configuration message including the following information from the base station (S1201).

[0154] - DRX Inactivity Timer (drx-InactivityTimer)

[0155] - LPReceiver_priority for drx-InactivityTimer: An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0156] Meanwhile, the terminal performs data transmission and reception with the base station via MR (S1202), and when drx-InactivityTimer expires, it switches to LR CONNECTED mode (S1203). If LPReicevier_priority is set for the timer, the terminal performs LP WUS monitoring via the LR receiver (S1204).

[0157] If it is decided to perform RLM (radio link monitoring) / BFD (beam failure detection) / CSI (channel state information), RRM (radio resource management) measurements through the MR transceiver, the terminal uses the MR only for this purpose, and MR PDCCH monitoring is not performed.

[0158] Hereinafter, the operation of the base station is described in detail with reference to FIG. 12.

[0159] The base station transmits an RRC configuration message including the following information to the terminal (S1201).

[0160] - DRX Inactivity Timer (drx-InactivityTimer)

[0161] - LPReceiver_priority for drx-InactivityTimer: An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0162] Meanwhile, the base station performs data transmission and reception through the terminal's MR (S1202).

[0163] If the terminal's drx-InactivityTimer expires and LPReicevier_priority is set for the timer, the base station recognizes that the terminal has started LP WUS monitoring through the LR receiver (S1204).

[0164] If it is decided that RLM (radio link monitoring) / BFD (beam failure detection) / CSI (channel state information), RRM (radio resource management) measurements will be performed through the MR transceiver, the base station will use the terminal's MR only for this purpose and transmit the LP WUS first before transmitting the PDCCH.

[0165] Meanwhile, the indicators proposed in this specification may have different preferences depending on the data type set for the terminal. For this reason, the present invention additionally proposes iii) data type-based LR application, i.e., a method for selectively applying LR depending on the data type.

[0166] This allows the above indicator to be set for each DRB (data radio bearer) ID (identity). That is, the base station sets the indicator for a specific DRB ID to the terminal so that, when a DRB for which the indicator is set exists, LP WUS monitoring is performed through the LR receiver when switching to power saving mode. At this time, the indicator can be set for each RB (radio bearer) or LCH (logical channel) / LCG (logical channel group) in the radio bearer configuration (RadioBearerConfig) or logical channel configuration (LogicalChannelConfig), or by including a list of related DRB IDs together with the indicator in the LR-related configuration message.

[0167] Figure 13 illustrates a procedure of a terminal and a base station according to another embodiment of the present specification.

[0168] Figure 13 shows the procedure of the terminal and base station for the previously described iii) data type-based LR application, i.e., the method of selectively applying LR according to the data type.

[0169] Hereinafter, terminal operation is described in detail with reference to FIG. 13.

[0170] The terminal receives an RRC configuration message including the following information from the base station (S1301).

[0171] - Low Power Receiver Priority (LPReceiver_priority): An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0172] - DRB ID list: One or more DRB ID(s) information for applying LPReceiver_priority.

[0173] Meanwhile, the terminal performs data transmission and reception with the base station through MR (S1302), and if drx-InactivityTimer expires and the DRB ID(s) associated with LPReceiver_priority are set, it switches to LR, i.e., switches to LR CONNECTED mode (S1303).

[0174] Afterwards, the terminal performs LP WUS monitoring through the LR receiver (S1304).

[0175] If it is decided that RLM / BFD / CSI, RRM measurements will be performed through the MR transceiver, the terminal will use the MR only for this purpose, and MR PDCCH monitoring will not be performed.

[0176] Hereinafter, the operation of the base station is specifically described with reference to FIG. 13.

[0177] The base station transmits an RRC configuration message including the following information to the terminal (S1301).

[0178] - Low Power Receiver Priority (LPReceiver_priority): An indicator that instructs to give priority to LP WUS monitoring using the LR receiver when the UE enters PS (power saving) mode.

[0179] - DRB ID list: One or more DRB ID(s) information for applying LPReceiver_priority.

[0180] Meanwhile, the base station performs data transmission and reception through the terminal's MR (S1302).

[0181] If drx-InactivityTimer expires and the DRB ID(s) associated with LPReceiver_priority are set, the base station recognizes that the terminal has started monitoring LP WUS via the LR receiver.

[0182] If it is decided that RLM / BFD / CSI, RRM measurements will be performed through the MR transceiver, the base station will use the terminal's MR only for this purpose and transmit the LP WUS first before transmitting the PDCCH.

[0183] The indicator (lowPowerReceiver_priority) proposed in the present invention can be set from the base station to the terminal based on power saving technology preference information that can be defined as one of the assistance information of the UE (for example, DRX-Preference or LR-Preference). That is, parameters related to "preference on low power receiver" can be newly defined as one of the UE assistance information of the terminal, and when the terminal prefers to operate in LR mode over the conventional PS (power saving) technology, the preference can be notified to the base station through the assistance information. This can be applied to all of the above-described schemes i), ii), and iii), and the "preference on LR" can be set in a method suitable for each scheme. That is, in the case of scheme i), one "preference on LR" can be defined for the terminal, and in the case of scheme ii), it can be defined to notify the LR preference for each RRC state of the terminal. LR preference by RRC state means that "preference on LR" can be set individually for IDLE, INACTIVE, and C_DRX. In the case of method iii), the DRB ID list of the terminal can be included for "preference on LR". The base station can decide whether to include the above indicator (lowPowerReceiver_priority) in the RRC message indicating state transition or the message setting the timer based on the previous information received from the terminal.

[0184] Figure 14 illustrates an operation method of a terminal according to another embodiment of the present specification.

[0185] Referring to Fig. 14, the terminal receives configuration information related to a low power wake up receiver (LR) from a base station (S1401). Thereafter, based on the received LR configuration information, LP WUS (Low Power Wake Up Signal) monitoring is performed through the LR receiver (S1402). The LR configuration information includes an indicator that indicates priority operation of the LR mode among the Main Radio transceiver (MR) mode and the LR mode.

[0186] The above LR-related configuration information can be received via an RRC (Radio Resource Control) message. In addition, PDCCH (physical downlink control channel) monitoring based on LP WUS can be enabled or disabled by the LR-related configuration information.

[0187] Meanwhile, the performance of LP WUS monitoring may be further based on at least one of the expiration of a power saving related timer and the reception of a signaling indicating power saving.

[0188] The above power saving related timer may be a data inactivity or DRX (discontinuous reception) inactivity timer, and the signaling indicating the power saving may be done through an RRC release message.

[0189] Additionally, assistance information may be transmitted from the terminal to the base station, and based on this, an indicator indicating priority operation of the LR mode may be included in the LR-related configuration information.

[0190] Figure 15 illustrates an operation method of a base station according to one embodiment of the present specification.

[0191] Referring to FIG. 15, the base station determines the priority operation of the low power wake up receiver (LR) mode of the terminal (S1501). Thereafter, the base station transmits LR-related configuration information for LP WUS (Low Power Wake Up Signal) monitoring to the terminal (S1502). The LR-related configuration information includes an indicator that indicates priority operation of the LR mode among the main radio transceiver (MR) mode and the LR mode of the terminal.

[0192] The above LR-related configuration information can be transmitted via an RRC (Radio Resource Control) message. In addition, PDCCH (physical downlink control channel) monitoring based on LP WUS can be enabled or disabled by the above LR-related configuration information.

[0193] Meanwhile, at least one of transmission of timer information related to power saving for LP WUS monitoring of the terminal and transmission of signaling instructing power saving may be performed by the base station.

[0194] The above power saving related timer may be a data inactivity or DRX (discontinuous reception) inactivity timer, and the signaling indicating the power saving may be done through an RRC release message.

[0195] Additionally, the base station may receive assistance information from the terminal, and based on this, the LR-related configuration information may include an indicator indicating priority operation of the LR mode.

[0196] The concepts disclosed in this specification can be applied independently or combined and operated in any form. Furthermore, while this specification is based on a 5G NR system, the scope of this specification encompasses all cases where the concepts of this specification apply, regardless of the specific wireless communication technology.

[0197] Figure 16 illustrates a device according to one embodiment of the present specification.

[0198] Referring to FIG. 16, the wireless communication system may include a first device (100a) and a second device (100b).

[0199] The first device (100a) may be a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV), an AI (Artificial Intelligence) module, a robot, an AR (Augmented Reality) device, a VR (Virtual Reality) device, an MR (Mixed Reality) device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, a device related to 5G services, or any other device related to the 4th industrial revolution field.

[0200] The second device (100b) may be a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV), an AI (Artificial Intelligence) module, a robot, an AR (Augmented Reality) device, a VR (Virtual Reality) device, an MR (Mixed Reality) device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, a device related to 5G services, or any other device related to the 4th industrial revolution field.

[0201] The first device (100a) may include at least one processor, such as a processor (1020a), at least one memory, such as a memory (1010a), and at least one transceiver, such as a transceiver (1031a). The processor (1020a) may perform the functions, procedures, and / or methods described above. The processor (1020a) may perform one or more protocols. For example, the processor (1020a) may perform one or more layers of a wireless interface protocol. The memory (1010a) may be connected to the processor (1020a) and may store various types of information and / or commands. The transceiver (1031a) may be connected to the processor (1020a) and may be controlled to transmit and receive wireless signals.

[0202] The second device (100b) may include at least one processor, such as a processor (1020b), at least one memory device, such as a memory (1010b), and at least one transceiver, such as a transceiver (1031b). The processor (1020b) may perform the functions, procedures, and / or methods described above. The processor (1020b) may implement one or more protocols. For example, the processor (1020b) may implement one or more layers of a wireless interface protocol. The memory (1010b) may be connected to the processor (1020b) and may store various types of information and / or commands. The transceiver (1031b) may be connected to the processor (1020b) and may be controlled to transmit and receive wireless signals.

[0203] The memory (1010a) and / or the memory (1010b) may be connected internally or externally to the processor (1020a) and / or the processor (1020b), or may be connected to another processor via various technologies such as a wired or wireless connection.

[0204] The first device (100a) and / or the second device (100b) may have one or more antennas. For example, the antenna (1036a) and / or the antenna (1036b) may be configured to transmit and receive wireless signals.

[0205] Fig. 17 is a block diagram showing the configuration of a terminal according to one embodiment of the present specification.

[0206] In particular, FIG. 17 is a drawing illustrating the device of FIG. 16 in more detail.

[0207] The device includes a memory (1010), a processor (1020), a transceiver (1031), a power management module (1091), a battery (1092), a display (1041), an input unit (1053), a speaker (1042), and a microphone (1052), a subscriber identification module (SIM) card, and one or more antennas.

[0208] The processor (1020) may be configured to implement the proposed functions, procedures, and / or methods described herein. Layers of a radio interface protocol may be implemented in the processor (1020). The processor (1020) may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and / or data processing devices. The processor (1020) may be an application processor (AP). The processor (1020) may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). Examples of the processor (1020) may be a SNAPDRAGON™ series processor manufactured by Qualcomm®, an EXYNOSTM series processor manufactured by Samsung®, an A series processor manufactured by Apple®, a HELIO™ series processor manufactured by MediaTek®, an ATOM™ series processor manufactured by INTEL®, a KIRINTM series processor manufactured by HiSilicon®, or a corresponding next-generation processor.

[0209] The power management module (1091) manages power to the processor (1020) and / or the transceiver (1031). The battery (1092) supplies power to the power management module (1091). The display (1041) outputs the results processed by the processor (1020). The input unit (1053) receives input to be used by the processor (1020). The input unit (1053) can be displayed on the display (1041). A SIM card is an integrated circuit used to securely store an international mobile subscriber identity (IMSI) and its associated keys, which are used to identify and authenticate subscribers in mobile devices such as mobile phones and computers. Contact information can also be stored on many SIM cards.

[0210] The memory (1010) is operably coupled to the processor (1020) and stores various information for operating the processor (610). The memory (1010) may include a read-only memory (ROM), a random access memory (RAM), flash memory, a memory card, a storage medium, and / or other storage devices. When the embodiment is implemented in software, the techniques described herein may be implemented as modules (e.g., procedures, functions, etc.) that perform the functions described herein. The modules may be stored in the memory (1010) and executed by the processor (1020). The memory (1010) may be implemented within the processor (1020). Alternatively, the memory (1010) may be implemented external to the processor (1020) and communicatively connected to the processor (1020) via various means known in the art.

[0211] The transceiver (1031) is operably coupled to the processor (1020) and transmits and / or receives a radio signal. The transceiver (1031) includes a transmitter and a receiver. The transceiver (1031) may include baseband circuitry for processing a radio frequency signal. The transceiver controls one or more antennas to transmit and / or receive a radio signal. The processor (1020) transmits command information to the transceiver (1031) to initiate communication, for example, to transmit a radio signal constituting voice communication data. The antenna functions to transmit and receive radio signals. Upon receiving a radio signal, the transceiver (1031) may transmit the signal to the processor (1020) for processing and convert the signal to baseband. The processed signal may be converted into audible or readable information output through the speaker (1042).

[0212] The speaker (1042) outputs sound-related results processed by the processor (1020). The microphone (1052) receives sound-related input to be used by the processor (1020).

[0213] A user inputs command information, such as a phone number, for example, by pressing (or touching) a button on an input unit (1053) or by voice activation using a microphone (1052). The processor (1020) receives this command information and processes it to perform an appropriate function, such as dialing a phone number. Operational data can be extracted from a SIM card or memory (1010). In addition, the processor (1020) can display command information or operation information on a display (1041) for the user's recognition and convenience.

[0214] Figure 18 shows a block diagram of a processor in which the disclosure of this specification is implemented.

[0215] As can be seen from FIG. 18, the processor (1020) implementing the disclosure of the present specification may include multiple circuits to implement the proposed functions, procedures, and / or methods described herein. For example, the processor (1020) may include a first circuit (1020-1), a second circuit (1020-2), and a third circuit (1020-3). Furthermore, although not shown, the processor (1020) may include more circuits. Each circuit may include multiple transistors.

[0216] The above processor (1020) may be called an application-specific integrated circuit (ASIC) or an application processor (AP), and may include at least one of a digital signal processor (DSP), a central processing unit (CPU), and a graphics processing unit (GPU).

[0217] FIG. 19 is a block diagram showing in detail the transmitter / receiver of the first device illustrated in FIG. 16 or the transmitter / receiver unit of the device illustrated in FIG. 17.

[0218] Referring to FIG. 19, the transceiver (1031) includes a transmitter (1031-1) and a receiver (1031-2). The transmitter (1031-1) includes a Discrete Fourier Transform (DFT) unit (1031-11), a subcarrier mapper (1031-12), an IFFT unit (1031-13), a CP insertion unit (1031-14), and a wireless transmitter (1031-15). The transmitter (1031-1) may further include a modulator. In addition, for example, the transmitter may further include a scramble unit (not shown), a modulation mapper (not shown), a layer mapper (not shown), and a layer permutator (not shown), which may be arranged before the DFT unit (1031-11). That is, in order to prevent an increase in PAPR (peak-to-average power ratio), the transmitter (1031-1) first passes the information through a DFT (1031-11) before mapping the signal to a subcarrier. The signal spread (or precoded in the same sense) by the DFT unit (1031-11) is mapped to a subcarrier through a subcarrier mapper (1031-12) and then passes through an IFFT (Inverse Fast Fourier Transform) unit (1031-13) to be converted into a signal on the time axis.

[0219] The DFT unit (1031-11) performs DFT on the input symbols and outputs complex-valued symbols. For example, if Ntx symbols are input (where Ntx is a natural number), the DFT size is Ntx. The DFT unit (1031-11) may be called a transform precoder. The subcarrier mapper (1031-12) maps the complex symbols to each subcarrier in the frequency domain. The complex symbols may be mapped to resource elements corresponding to resource blocks allocated for data transmission. The subcarrier mapper (1031-12) may be called a resource element mapper. The IFFT unit (1031-13) performs IFFT on the input symbols and outputs a baseband signal for data, which is a time-domain signal. The CP insertion unit (1031-14) copies a portion of the rear portion of the baseband signal for data and inserts it into the front portion of the baseband signal for data. CP insertion prevents ISI (Inter-Symbol Interference) and ICI (Inter-Carrier Interference), thereby maintaining orthogonality even in multipath channels.

[0220] On the other hand, the receiver (1031-2) includes a wireless reception unit (1031-21), a CP removal unit (1031-22), an FFT unit (1031-23), and an equalization unit (1031-24). The wireless reception unit (1031-21), the CP removal unit (1031-22), and the FFT unit (1031-23) of the receiver (1031-2) perform the inverse functions of the wireless transmission unit (1031-15), the CP insertion unit (1031-14), and the IFF unit (1031-13) of the transmitter (1031-1). The receiver (1031-2) may further include a demodulator.

[0221] Although the preferred embodiments have been described above by way of example, the disclosure of this specification is not limited to such specific embodiments, and may be modified, changed, or improved in various forms within the scope described in the spirit and claims of this specification.

[0222] In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks. However, the order of the steps described is not limited, and some steps may occur in a different order or simultaneously with other steps described above. Furthermore, those skilled in the art will understand that the steps depicted in the flowchart are not exclusive, and other steps may be included, or one or more steps in the flowchart may be deleted without affecting the scope of the invention.

[0223] The claims set forth in this specification may be combined in various ways. For example, the technical features of the method claims of this specification may be combined and implemented as a device, and the technical features of the device claims of this specification may be combined and implemented as a method. Furthermore, the technical features of the method claims and the technical features of the device claims of this specification may be combined and implemented as a device, and the technical features of the method claims and the technical features of the device claims of this specification may be combined and implemented as a method.

Claims

1. In a method of operating a terminal in a wireless communication system, A step of receiving configuration information related to a low power wake up receiver (LR); and Based on the above LR-related setting information, a step of performing LP WUS (Low Power Wake Up Signal) monitoring through an LR receiver is included. A method in which the above LR-related setting information includes an indicator indicating priority operation of the LR mode among the main radio transceiver (MR) mode and the LR mode.

2. In paragraph 1, A method in which the above LR related setting information is received via an RRC (Radio Resource Control) message.

3. In paragraph 2, A method in which PDCCH (physical downlink control channel) monitoring based on LP WUS is enabled or disabled by the above LR-related setting information.

4. In paragraph 1, A method wherein the performance of the above LP WUS monitoring is further based on at least one of expiration of a power saving related timer and reception of a signaling indicating power saving.

5. In paragraph 4, A method wherein the power saving related timer is a data inactivity or DRX (discontinuous reception) inactivity timer, and the reception of signaling indicating power saving is the reception of an RRC release message.

6. In paragraph 1, Further comprising a step of transmitting assistance information, A method, wherein, based on the above help information, the LR-related setting information includes an instruction indicating priority operation of the LR mode.

7. In a method of operating a base station in a wireless communication system, A step of determining the priority operation of the low power wake up receiver (LR) mode of the terminal; and After determining the priority operation of the above LR mode, a step of transmitting LR-related setting information for LP WUS (Low Power Wake Up Signal) monitoring is included. A method in which the above LR-related setting information includes an indicator indicating priority operation of the LR mode among the main radio transceiver (MR) mode of the terminal and the LR mode.

8. In paragraph 7, A method in which the above LR related setting information is transmitted via an RRC (Radio Resource Control) message.

9. In paragraph 8, A method in which PDCCH (physical downlink control channel) monitoring based on LP WUS is enabled or disabled by the above LR-related setting information.

10. In paragraph 7, A method for monitoring the above LP WUS, wherein at least one of transmission of power saving related timer information and transmission of signaling instructing power saving is performed.

11. In paragraph 10, A method wherein the power saving related timer is a data inactivity or DRX (discontinuous reception) inactivity timer, and the transmission of signaling indicating power saving is transmission of an RRC release message.

12. In paragraph 7, Further comprising a step of receiving assistance information, A method, wherein, based on the above help information, the LR-related setting information includes an instruction indicating priority operation of the LR mode.

13. As a communication device in a wireless communication system, at least one processor; and At least one memory storing instructions and being operably electrically connectable to the at least one processor, wherein the operations performed based on the instructions being executed by the at least one processor are: A step for receiving configuration information related to a low power wake up receiver (LR), and Based on the above LR-related setting information, a step of performing LP WUS (Low Power Wake Up Signal) monitoring through an LR receiver is included. A communication device, wherein the above LR-related setting information includes an indicator that indicates priority operation of the LR mode among the main radio transceiver (MR) mode and the LR mode.

14. In paragraph 13, A communication device in which the above LR-related setting information is received via an RRC (Radio Resource Control) message.

15. In paragraph 14, A communication device in which PDCCH (physical downlink control channel) monitoring based on LP WUS is enabled or disabled by the above LR-related setting information.

16. In paragraph 13, A communication device wherein the performance of the above LP WUS monitoring is further based on at least one of expiration of a power saving related timer and reception of a signaling indicating power saving.

17. In paragraph 16, A communication device in which the above power saving related timer is a data inactivity or DRX (discontinuous reception) inactivity timer, and the reception of signaling indicating the power saving is the reception of an RRC release message.

18. In paragraph 13, Based on the above instruction being executed by the at least one processor, the operations performed are: Further comprising a step of transmitting assistance information, A communication device, wherein the LR-related setting information includes an instruction for indicating priority operation of the LR mode based on the above-mentioned help information.

Images