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

Abstract

A method for measuring a signal by a terminal in a wireless communication system according to an embodiment of the present disclosure may comprise the steps of: performing a second type radio resource management (RRM) measurement in a second mode supporting only a second type signal among a first type signal and the second type signal; switching from the second mode to a first mode supporting the first type of signal based on the second type of RRM measurement; and performing a first type of RRM measurement in a first mode, where the second mode is switched to the first mode based on a result of the second type of RRM measurement having a value less than a threshold.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving wireless signals. Background Art

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

[0003] Technical issues

[0004] An object of the present disclosure is to provide a method and apparatus for transmitting or receiving signals more accurately and efficiently in a wireless communication system.

[0005] Other technical objectives can be derived from the embodiments disclosed in the detailed description.

[0006] Technical Solution

[0007] In one aspect of the present disclosure, a method for measuring signals by a user equipment (UE) in a wireless communication system is provided. The method includes the following steps: performing a second-type radio resource management (RRM) measurement in a second mode that supports only a second-type signal among a first-type signal and a second-type signal; switching from the second mode to a first mode that supports the first-type signal based on the second-type RRM measurement; and performing the first-type RRM measurement in the first mode. The switching from the second mode to the first mode may be performed based on a result of the second-type RRM measurement being below a threshold.

[0008] The second type RRM measurement may be performed periodically.Based on the periodically performed second type RRM measurement, the first type RRM measurement may be deactivated, or the periodicity of the first type RRM measurement may be increased.

[0009] The first type RRM measurements and the second type RRM measurements may be performed on different signals.

[0010] The second type RRM measurement may be performed based on a wake-up signal (WUS) provided as a second type signal.

[0011] Based on the number of occasions for the second type RRM measurement being set to be less than a specific value, switching from the second mode to the first mode may be performed.

[0012] The measurement result value may be calculated based on a combination of the result of the second type RRM measurement and the result of the first type RRM measurement.

[0013] Both the first type RRM measurements and the second type RRM measurements may be performed in the first mode.

[0014] The first type signal may be an Orthogonal Frequency Division Multiplexing (OFDM) based signal, and the second type signal may be a non-OFDM based signal.

[0015] In another aspect of the present disclosure, a computer-readable recording medium having recorded thereon a program for executing the above-mentioned method is provided herein.

[0016] In another aspect of the present disclosure, an apparatus for wireless communication is provided. The apparatus includes: a memory configured to store instructions; and a processor configured to perform operations by executing the instructions. The operations of the processor include: performing second-type RRM measurements in a second mode that supports only second-type signals of the first and second types of signals; switching from the second mode to a first mode that supports first-type signals based on the second-type RRM measurements; and performing first-type RRM measurements in the first mode. Switching from the second mode to the first mode may be performed based on a result of the second-type RRM measurement being lower than a threshold.

[0017] The apparatus may further include a main radio (MR) receiver configured to receive the first type of signal and a low power wake-up radio (LP-WUR) receiver configured to receive the second type of signal.

[0018] The apparatus may be a UE operating in a wireless communication system or a processing apparatus configured to control a UE.

[0019] In another aspect of the present disclosure, a method performed by a base station (BS) in a wireless communication system is provided. The method includes the following steps: separately transmitting a first type signal and a second type signal based on respective periodicities; receiving information regarding a second type of RRM measurement from a UE operating in a second mode supporting only the second type signal; and receiving information regarding a first type of RRM measurement from the UE after the UE switches from the second mode to a first mode supporting the first type signal. The BS may determine that the UE switches from the second mode to the first mode based on a result of the second type of RRM measurement being lower than a threshold.

[0020] In another aspect of the present disclosure, a base station (BS) for wireless communication is provided herein. The BS includes: a memory configured to store instructions; and a processor configured to perform operations by executing the instructions. Operations of the processor include: separately transmitting a first type signal and a second type signal based on respective periodicities; receiving information about a second type of RRM measurement from a UE operating in a second mode supporting only the second type of signal; and receiving information about a first type of RRM measurement from the UE after the UE switches from the second mode to the first mode supporting the first type of signal. Based on a result of the second type of RRM measurement being lower than a threshold, the processor may be configured to determine that the UE switches from the second mode to the first mode.

[0021] Beneficial effects

[0022] According to the embodiments, signals can be transmitted / received more accurately and efficiently in a wireless communication system.

[0023] Other technical effects can be derived from the embodiments disclosed in the detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Physical channels used in a 3rd Generation Partnership Project (3GPP) system as an exemplary wireless communication system and a general signal transmission method using the same are shown.

[0025] Figure 2 Shows the radio frame structure.

[0026] Figure 3 A resource grid showing time slots.

[0027] Figure 4 An exemplary mapping of physical channels in time slots is shown.

[0028] Figure 5 An exemplary physical downlink control channel (PDCCH) transmission and reception process is shown.

[0029] Figure 6 An exemplary physical downlink shared channel (PDSCH) reception and acknowledgement / negative acknowledgement (ACK / NACK) transmission process is shown.

[0030] Figure 7 An exemplary physical uplink shared channel (PUSCH) transmission process is shown.

[0031] Figures 8 to 10 is a diagram illustrating discontinuous reception (DRX) related operations.

[0032] Figure 11 is a diagram showing a wake-up signal (WUS).

[0033] Figure 12 Receiver type switching is shown to transition between radio resource management (RRM) measurements of a low power receiver (LR) and RRM measurements of a primary receiver (MR) according to an embodiment.

[0034] Figure 13 is a diagram for explaining operations of a network and a user equipment (UE) related to RRM measurement in a wireless communication system according to an embodiment.

[0035] Figure 14 It is a diagram for explaining the operation of the UE according to an embodiment.

[0036] Figure 15 is a diagram for explaining operations of a base station (BS) according to an embodiment.

[0037] Figures 16 to 19 An example of the communication system 1 and wireless device applicable to the present disclosure is shown. DETAILED DESCRIPTION

[0038] Embodiments of the present disclosure are applicable to various wireless access technologies such as 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). CDMA can be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Worldwide Interoperability for Microwave Access (WiMAX)), IEEE 802.20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (A) 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.

[0039] As more and more communication devices require greater communication capacity, enhanced mobile broadband communication relative to traditional radio access technology (RAT) is needed. In addition, large-scale machine type communication (MTC), which can provide various services anytime and anywhere by connecting multiple devices and objects, is another important issue to be considered in the next generation of communications. Discussions are also underway to design communication systems that take into account services / UEs that are sensitive to reliability and latency. Therefore, discussions are underway to introduce new radio access technologies that take into account enhanced mobile broadband communication (eMBB), massive MTC, and ultra-reliable low-latency communication (URLLC). In the embodiments of the present disclosure, for simplicity, this technology will be referred to as NR (new radio or new RAT).

[0040] The term "base station" used in this specification can be replaced with terms such as fixed station, Node B, gNode B (gNB), access point (AP), cell, or transmission and reception point (TRP). The term "relay" can be replaced with terms such as relay node (RN) or relay station. In addition, the term "terminal" can be replaced with terms such as user equipment (UE), mobile station (MS), mobile subscriber station (MSS), or subscriber station (SS).

[0041] For the sake of brevity, 3GPP NR is mainly described, but the technical concept of the present disclosure is not limited thereto.

[0042] For background information, definitions of terms, and abbreviations related to the present disclosure, the following documents are incorporated by reference.

[0043] 3GPP LTE

[0044] -38.211: Physical channels and modulation

[0045] -38.212: Multiplexing and channel coding

[0046] -38.213: Physical layer procedures for control

[0047] -38.214: Physical layer procedures for data

[0048] -38.215: Physical layer measurements

[0049] -38.300: NR and NG-RAN general description

[0050] -38.304: User Equipment (UE) procedures in idle mode and RRC inactive state

[0051] -38.321: Medium Access Control (MAC) Protocol Specification

[0052] -38.331: Radio Resource Control (RRC) Protocol Specification

[0053] -37.213: Introducing channel access procedures for unlicensed spectrum for NR-based access

[0054] -36.355: LTE positioning protocol

[0055] -37.355: LTE positioning protocol

[0056] Terms and abbreviations

[0057] -5GC: 5G core network

[0058] -5GS: 5G system

[0059] -AP: Access Point

[0060] -CID: Cell ID

[0061] -E-CID: Enhanced Cell ID

[0062] -PRS: Positioning Reference Signal

[0063] -RRM: Radio Resource Management

[0064] -TP: Transmitting Point

[0065] -TRP: Transmit and Receive Point

[0066] -UE: User Equipment

[0067] -SSB: Synchronization Signal Block

[0068] -SFN: System Frame Number

[0069] -SS: Search space

[0070] -CSS: Common Search Space

[0071] -USS: UE-specific search space

[0072] -PDCCH: Physical Downlink Control Channel

[0073] -PDSCH: Physical Downlink Shared Channel

[0074] -PUCCH: Physical Uplink Control Channel

[0075] -PUSCH: Physical Uplink Shared Channel

[0076] -DCI: Downlink Control Information

[0077] -UCI: Uplink Control Information

[0078] -SI: System Information

[0079] -SIB: System Information Block

[0080] -MIB: Master Information Block

[0081] -RRC: Radio Resource Control

[0082] -DRX: Discontinuous Reception

[0083] -RNTI: Radio Network Temporary Identifier

[0084] -CSI: Channel State Information

[0085] -PCell: Primary cell

[0086] -SCell: Secondary cell

[0087] -PSCell: Primary SCG (Secondary Cell Group) cell

[0088] -CA: Carrier Aggregation

[0089] -WUS: wake-up signal

[0090] -PO: Paging Occasion

[0091] -PEI: Paging Early Indication

[0092] -PEI-O: PEI timing

[0093] -NES: Network Energy Saving

[0094] -RO: RACH timing

[0095] -RAR: Random Access Response

[0096] -SDT: Small Data Transfer

[0097] -LP-WUS: Low Power Wake-up Signal

[0098] -XR: Abbreviation for Extended Reality. VR (Virtual Reality), AR (Augmented Reality), MR (Mixed Reality)

[0099] -RRM: Radio Resource Management

[0100] In a wireless communication system, a user equipment (UE) receives information from a base station (BS) via a downlink (DL) and transmits information to the BS via an uplink (UL). The information transmitted and received by the BS and the UE includes data and various control information, and includes various physical channels depending on the type and purpose of the information transmitted and received by the UE and the BS.

[0101] Figure 1This section describes physical channels used in the 3GPP NR system and a general signal transmission method using the channels.

[0102] When the UE is powered on again from a power-off state or enters a new cell, in step S101, the UE performs an initial cell search process (e.g., establishing synchronization with the BS). To this end, the UE receives a synchronization signal block (SSB) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE establishes synchronization with the BS based on the PSS / SSS and obtains information such as a cell identity (ID). The UE can obtain broadcast information in the cell based on the PBCH. During the initial cell search, the UE can receive a DL reference signal (RS) to monitor the DL channel status.

[0103] After the initial cell search, the UE may acquire more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on information of the PDCCH in step S102.

[0104] In steps S103 to S106, the UE may perform a random access procedure to access the BS. For random access, the UE may transmit a preamble to the BS on a physical random access channel (PRACH) (S103) and receive a response message to the preamble on a PDCCH and a PDSCH corresponding to the PDCCH (S104). In the case of contention-based random access, the UE may further perform a contention resolution procedure by transmitting a PRACH (S105) and receiving a PDCCH and a PDSCH corresponding to the PDCCH (S106).

[0105] After the aforementioned process, the UE may receive PDCCH / PDSCH (S107) and send a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general downlink / uplink signal transmission process. The control information sent from the UE to the BS is called uplink control information (UCI). UCI includes hybrid automatic repeat and request acknowledgement / negative confirmation (HARQ-ACK / NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. Although UCI is usually sent on PUCCH, when control information and service data need to be sent simultaneously, UCI can be sent on PUSCH. In addition, UCI can be sent aperiodically via PUSCH according to the request / command of the network.

[0106] Figure 2Figure 2 shows the radio frame structure. In NR, uplink and downlink transmissions are configured in frames. Each radio frame has a length of 10 ms and is divided into two 5 ms half frames (HF). Each half frame is divided into five 1 ms subframes (SF). A subframe is divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 orthogonal frequency division multiplexing (OFDM) symbols. When a normal CP is used, each time slot includes 14 OFDM symbols. When an extended CP is used, each time slot includes 12 OFDM symbols.

[0107] Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS when a normal CP is used.

[0108] [Table 1]

[0109] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 15KHz (u=0) 14 10 1 30KHz (u=1) 14 20 2 60KHz (u=2) 14 40 4 120KHz (u=3) 14 80 8 240KHz (u=4) 14 160 16

[0110] *N slot symb : The number of symbols in a time slot

[0111] *N frame,u slot : Number of time slots in a frame

[0112] *N subframe,u slot : Number of time slots in a subframe

[0113] Table 2 shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS when the extended CP is used.

[0114] [Table 2]

[0115] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 60KHz (u=2) 12 40 4

[0116] The structure of the frame is only an example. The number of subframes, the number of time slots, and the number of symbols in a frame may vary.

[0117] In an NR system, OFDM parameter sets (e.g., SCSs) may be configured differently for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., SF, time slot, or TTI) consisting of the same number of symbols (referred to as a time unit (TU) for simplicity) may be configured differently between the aggregated cells. Symbols may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or Discrete Fourier Transform-Spread-OFDM (DFT-s-OFDM) symbols).

[0118] Figure 3A resource grid showing a time slot. A time slot includes multiple symbols in the time domain. For example, when a normal CP is used, a time slot includes 14 symbols. However, when an extended CP is used, a time slot includes 12 symbols. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) is defined as a plurality of consecutive subcarriers in the frequency domain (e.g., 12 consecutive subcarriers). A bandwidth part (BWP) can be defined as a plurality of consecutive physical RBs (PRBs) in the frequency domain and corresponds to a single parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., five) BWPs. Data communication can be performed via enabled BWPs, and only one BWP can be enabled for a UE. In the resource grid, each element is called a resource element (RE), and one complex symbol can be mapped to each RE.

[0119] Figure 4 An example of mapping physical channels in a time slot is shown. In the NR system, a frame is characterized by a self-contained structure in which a DL control channel, DL or UL data, and a UL channel can all be included in one time slot. For example, the first N symbols of a time slot can be used to carry a DL channel (e.g., PDCCH) (hereinafter referred to as the DL control region), and the last M symbols of the time slot can be used to carry a UL channel (e.g., PUCCH) (hereinafter referred to as the UL control region). Each of N and M is an integer equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter referred to as the data region) can be used to send DL data (e.g., PDSCH) or UL data (e.g., PUSCH). The guard period (GP) provides a time gap for switching from a transmit mode to a receive mode or from a receive mode to a transmit mode. Some symbols in a subframe at the time of DL to UL switching can be configured as GP.

[0120] PDCCH transmits DCI. For example, PDCCH (i.e., DCI) may carry information about the transport format and resource allocation of the DL shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information about the paging channel (PCH), system information about DL-SCH, information about resource allocation of higher-layer control messages (e.g., RAR sent on PDSCH), transmit power control commands, information about the activation / release of the configured scheduling, etc. DCI includes a cyclic redundancy check (CRC). The CRC is masked using various identifiers (IDs) (e.g., radio network temporary identifier (RNTI)) according to the owner or purpose of the PDCCH. For example, if the PDCCH is for a specific UE, the CRC is masked by the UE ID (e.g., cell-RNTI (C-RNTI)). If the PDCCH is used for a paging message, the CRC is masked by the paging-RNTI (P-RNTI). If the PDCCH is for system information (eg, system information block (SIB)), the CRC is masked by the system information RNTI (SI-RNTI). When the PDCCH is for RAR, the CRC is masked by the random access-RNTI (RA-RNTI).

[0121] Figure 5 An exemplary PDCCH transmission / reception process is shown.

[0122] Reference Figure 5The BS may send a control resource set (CORESET) configuration to the UE (S502). A CORESET is defined as a set of resource element groups (REGs) with a given parameter set (e.g., subcarrier spacing (SCS), cyclic prefix (CP) length, etc.). A REG is defined by one (physical) resource block (P)RB as one OFDM symbol. Multiple CORESETs for one UE may overlap in the time / frequency domain. A CORESET may be configured using system information (e.g., a master information block (MIB)) or higher-layer signaling (e.g., radio resource control (RRC) signaling). For example, configuration information regarding a specific common CORESET (e.g., CORESET #0) may be sent in the MIB. For example, a PDSCH carrying system information block 1 (SIB1) may be scheduled by a specific PDCCH, and CORESET #0 may be used to transmit the specific PDCCH. In addition, configuration information regarding CORESET #N (e.g., N>0) may be sent via RRC signaling (e.g., cell-common RRC signaling, UE-specific RRC signaling, etc.). For example, UE-specific RRC signaling carrying CORESET configuration information may include (but is not limited to) various types of signaling, such as RRC setup message, RRC reconfiguration message and / or BWP configuration information. Specifically, CORESET configuration may include the following information / fields.

[0123] -controlResourceSetId: indicates the ID of the CORESET.

[0124] -frequencyDomainResources: Indicates the frequency domain resources of the CORESET. The resources are indicated by a bitmap where each bit corresponds to an RB group (= 6 (contiguous) RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in the BWP. RB groups corresponding to bits with a value of 1 are allocated as frequency domain resources for the CORESET.

[0125] -duration: Indicates the time domain resource of the CORESET. It indicates the number of consecutive OFDM symbols included in the CORESET. The duration has a value between 1 and 3.

[0126] -cce-REG-MappingType: Indicates the control channel element (CCE) to REG mapping type. Both interleaved and non-interleaved types are supported.

[0127] -interleaverSize: Indicates the interleaver size.

[0128] -pdcch-DMRS-ScramblingID: indicates the value used for PDCCH DMRS initialization. When pdcch-DMRS-ScramblingID is not included, the physical unit ID of the serving cell is used.

[0129] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0130] -reg-BundleSize: Indicates the REG bundle size.

[0131] -tci-PresentInDCI: Indicates whether the transmission configuration index (TCI) field is included in the DL-related DCI.

[0132] -tci-StatesPDCCH-ToAddList: indicates a subset of TCI states configured in pdcch-Config for providing a quasi co-location (QCL) relationship between DL RSs and PDCCH DMRS ports in an RS set (TCI state).

[0133] In addition, the BS may send a PDCCH search space (SS) configuration to the UE (S504). The PDCCH SS configuration may be sent via higher layer signaling (e.g., RRC signaling). For example, the RRC signaling may include (but is not limited to) various types of signaling, such as an RRC setup message, an RRC reconfiguration message, and / or BWP configuration information. Although for convenience of description, the PDCCH SS configuration may be sent via a higher layer signaling (e.g., RRC signaling). Figure 5 In FIG, the CORESET configuration and the PDCCH SS configuration are shown as being signaled separately, but the present disclosure is not limited thereto. For example, the CORESET configuration and the PDCCH SS configuration may be sent in one message (eg, through one RRC signaling) or may be sent separately in different messages.

[0134] The PDCCH SS configuration may include information regarding the configuration of a PDCCH SS set. A PDCCH SS set may be defined as a set of PDCCH candidates monitored (e.g., blindly detected) by a UE. One or more SS sets may be configured for a UE. Each SS set may be a UE-specific search space (USS) set or a common search space (CSS) set. For convenience, a PDCCH SS set may be referred to as an "SS" or "PDCCH SS."

[0135] A PDCCH SS set includes PDCCH candidates. A PDCCH candidate is a CCE that a UE monitors to receive / detect a PDCCH. Monitoring includes blind decoding (BD) of a PDCCH candidate. One PDCCH (candidate) includes 1, 2, 4, 8, or 16 CCEs, depending on the aggregation level (AL). One CCE includes 6 REGs. Each CORESET configuration is associated with one or more SSs, and each SS is associated with one CORESET configuration. One SS is defined based on one SS configuration, and the SS configuration may include the following information / fields.

[0136] -searchSpaceId: indicates the ID of the SS.

[0137] -controlResourceSetId: Indicates the CORESET associated with the SS.

[0138] - monitoringSlotPeriodicityAndOffset: indicates the periodicity (in time slots) and offset (in time slots) of PDCCH monitoring.

[0139] -monitoringSymbolsWithinSlot: Indicates the first OFDM symbol used for PDCCH monitoring in a slot configured for PDCCH monitoring. The first OFDM symbol used for PDCCH monitoring is indicated by a bitmap corresponding to each OFDM symbol in the slot. The MSB of the bitmap corresponds to the first OFDM symbol in the slot. The OFDM symbol corresponding to the bit set to 1 corresponds to the first symbol of the CORESET in the slot.

[0140] -nrofCandidates: indicates the number of PDCCH candidates for each AL (one of the values ​​0, 1, 2, 3, 4, 5, 6 and 8), where AL={1, 2, 4, 8, 16}.

[0141] -searchSpaceType: Indicates CSS or USS and the DCI format used in the corresponding SS type.

[0142] Subsequently, the BS may generate a PDCCH and transmit the PDCCH to the UE (S506), and the UE may monitor PDCCH candidates in one or more SSs to receive / detect the PDCCH (S508). The timing (e.g., time / frequency resources) at which the UE monitors the PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities may be configured in a time slot.

[0143] Table 3 shows the characteristics of each SS.

[0144] [Table 3]

[0145]

[0146] Table 4 shows the DCI format transmitted on the PDCCH.

[0147] [Table 4]

[0148]

[0149] DCI format 0_0 can be used to schedule TB-based (or TB-level) PUSCH, while DCI format 0_1 ​​can be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 can be used to schedule TB-based (or TB-level) PDSCH, while DCI format 1_1 can be used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (or DL ​​grant DCI). DCI formats 0_0 / 0_1 can be referred to as UL grant DCI or UL scheduling information, while DCI formats 1_0 / 1_1 can be referred to as DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic slot format indicator (SFI)) to UEs, while DCI format 2_1 is used to transmit DL preemption information to UEs. DCI format 2_0 and / or DCI format 2_1 can be transmitted on a group-common PDCCH (a PDCCH directed to a group of UEs) to a corresponding group of UEs.

[0150] DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCI formats, while DCI format 0_1 ​​and DCI format 1_1 may be referred to as non-fallback DCI formats. In the fallback DCI format, the DCI size / field configuration remains the same regardless of the UE configuration. In contrast, in the non-fallback DCI format, the DCI size / field configuration varies depending on the UE configuration.

[0151] The CCE-to-REG mapping type is configured as one of an interleaved CCE-to-REG type and a non-interleaved CCE-to-REG type.

[0152] - Non-interleaved CCE to REG mapping (or localized CCE to REG mapping) ( Figure 5 ): 6 REGs for a given CCE are grouped into one REG bundle, and all REGs for a given CCE are contiguous. One REG bundle corresponds to one CCE.

[0153] - Interleaved CCE to REG mapping (or distributed CCE to REG mapping) ( Figure 6): 2, 3, or 6 REGs for a given CCE are grouped into a REG bundle, and the REG bundle is interleaved within the CORESET. In a CORESET consisting of one or two OFDM symbols, a REG bundle includes 2 or 6 REGs, and in a CORESET consisting of three OFDM symbols, a REG bundle includes 3 or 6 REGs. The REG bundle size is set based on the CORESET.

[0154] Figure 6 An exemplary PDSCH reception and ACK / NACK transmission process is shown. Figure 6 , the UE can detect the PDCCH in time slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or DCI format 1_1) and indicates DL assignment to PDSCH offset K0 and PDSCH-HARQ-ACK report offset K1. For example, DCI format 1_0 or DCI format 1_1 may include the following information.

[0155] - Frequency domain resource assignment: indicates the set of RBs allocated to PDSCH.

[0156] - Time domain resource assignment: indicates K0 (eg, slot offset), the starting position of the PDSCH in slot #n+K0 (eg, OFDM symbol index), and the duration of the PDSCH (eg, the number of OFDM symbols).

[0157] -PDSCH-to-HARQ_feedback timing indicator: indicates K1.

[0158] -HARQ process number (4 bits): indicates the HARQ process ID of data (eg, PDSCH or TB).

[0159] - PUCCH resource indicator (PRI): indicates a PUCCH resource to be used for UCI transmission among multiple PUCCH resources in a PUCCH resource set.

[0160] After receiving PDSCH in slot #(n+K0) according to the scheduling information of slot #n, the UE may send UCI on PUCCH in slot #(n+K1). UCI may include HARQ-ACK response to PDSCH. For convenience, Figure 5 Based on the assumption that the SCS of PDSCH is equal to the SCS of PUCCH and slot #n1=slot #(n+K0), this should not be construed as limiting the present disclosure. When the SCSs are different, K1 may be indicated / interpreted based on the SCS of PUCCH.

[0161] When the PDSCH is configured to carry up to one TB, the HARQ-ACK response can be configured in one bit. When the PDSCH is configured to carry up to two TBs, the HARQ-ACK response can be configured in two bits if spatial bundling is not configured, and in one bit if spatial bundling is configured. When slot #(n+K1) is designated as the HARQ-ACK transmission timing for multiple PDSCHs, the UCI transmitted in slot #(n+K1) includes the HARQ-ACK responses for the multiple PDSCHs.

[0162] Whether the UE should perform spatial bundling for HARQ-ACK responses may be configured for each cell group (e.g., via RRC / higher layer signaling). For example, spatial bundling may be configured for each individual HARQ-ACK response sent on the PUCCH and / or for a HARQ-ACK response sent on the PUSCH.

[0163] When up to two (or two or more) TBs (or codewords) can be received at a time (or can be scheduled by one DCI) in the corresponding serving cell (for example, when the high-level parameter maxNrofCodeWordsScheduledByDCI indicates 2 TBs), spatial bundling can be supported. More than four layers can be used for 2TB transmission, and up to four layers can be used for 1TB transmission. As a result, when spatial bundling is configured for the corresponding cell group, spatial bundling can be performed for serving cells in the cell group that can schedule more than four layers. A UE that wants to send a HARQ-ACK response through spatial bundling can generate a HARQ-ACK response by performing a (bit-wise) logical AND operation on the A / N bits of multiple TBs.

[0164] For example, assuming that a UE receives DCI that schedules two TBs and receives the two TBs on the PDSCH based on the DCI, the UE performing spatial bundling can generate a single A / N bit by performing a logical AND operation between the first A / N bit of the first TB and the second A / N bit of the second TB. As a result, when both the first TB and the second TB are ACK, the UE reports an ACK bit value to the BS, and when at least one TB is NACK, the UE reports a NACK bit value to the BS.

[0165] For example, when only one TB is actually scheduled in a serving cell configured to receive two TBs, the UE may generate a single A / N bit by performing a logical AND operation on the A / N bits of the one TB and a bit value 1. As a result, the UE reports the A / N bits of the one TB to the BS.

[0166] Multiple parallel DL HARQ processes exist at the BS / UE for DL ​​transmissions. These processes allow for continuous DL transmissions while the BS awaits HARQ feedback indicating the success or failure of reception of the previous DL transmission. Each HARQ process is associated with a HARQ buffer in the Medium Access Control (MAC) layer. Each DL HARQ process manages state variables such as the number of MAC physical data unit (PDU) transmissions, HARQ feedback for MAC PDUs in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0167] Figure 7 An exemplary PUSCH transmission process is shown. Figure 7 , the UE can detect the PDCCH in time slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or 1_1). DCI format 1_0 or 1_1 may include the following information.

[0168] - Frequency domain resource assignment: indicates the RB set assigned to PUSCH.

[0169] -Time domain resource assignment: Indicates the slot offset K2 and the starting position (e.g., OFDM symbol index) and duration (e.g., number of OFDM symbols) of the PUSCH in the slot. The starting symbol and length of the PUSCH can be indicated by the start and length indicator value (SLIV) or separately.

[0170] The UE may then transmit the PUSCH in slot #(n+K2) according to the scheduling information in slot #n. The PUSCH includes the UL-SCH TB.

[0171] Paging

[0172] The network can (i) access UEs in RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states through paging messages, and (ii) indicate system information changes and Earthquake and Tsunami Warning System / Commercial Mobile Alert System (ETWS / CMAS) notifications to UEs in RRC_IDLE and RRC_INACTIVE states and UEs in RRC_CONNECTED state through short messages. Both paging messages and short messages are sent based on the PDCCH based on the P-RNTI. Paging messages are sent on the logical channel (Paging Control Channel (PCCH)), while short messages are sent directly on the physical channel PDCCH. Because the logical channel PCCH is mapped to the physical channel PDSCH, the paging message can be understood as being scheduled based on the PDCCH based on the P-RNTI.

[0173] While the UE remains in the RRC_IDLE state, the UE monitors the paging channel for core network (CN) initiated paging. In the RRC_INACTIVE state, the UE also monitors the paging channel for radio access network (RAN) initiated paging. The UE does not need to continuously monitor the paging channel. Paging discontinuous reception (DRX) is defined as monitoring the paging channel during only one paging occasion (PO) per DRX cycle by a UE in the RRC_IDLE or RRC_INACTIVE state. The paging DRX cycle is configured by the network as follows.

[0174] 1) When CN initiates paging, a default cycle is broadcast in the system information.

[0175] 2) When CN initiates paging, a UE-specific cycle is configured through NAS signaling.

[0176] 3) In case of RAN-initiated signaling, the UE-specific cycle is configured through RRC signaling.

[0177] Because all POs for UEs for CN-initiated signaling and RAN-initiated signaling are based on the same UE ID, the two POs overlap each other. The number of POs in a DRX cycle can be set by system information, and the network can assign UEs to POs based on ID.

[0178] When the UE is in RRC_CONNECTED state, the UE monitors the paging channel for SI change indication and PWS notification in each Paging Occasion (PO) signaled through system information. In Bandwidth Adaptation (BA), the RRC_CONNECTED UE monitors the paging channel only in the active BWP where the configured CSS is located.

[0179] In shared spectrum channel access, additional PDCCH monitoring opportunities may be configured in the UE's PO for paging monitoring. However, when a UE detects a PDCCH transmission based on the P-RNTI in its PO, the UE does not need to monitor subsequent PDCCH monitoring opportunities in the PO.

[0180] To reduce power consumption, the UE can use DRX in the RRC_IDLE state and the RRC_INACTIVE state. The UE monitors one PO per DRX cycle. A PO is a set of PDCCH monitoring opportunities and may include multiple time slots (e.g., subframes or OFDM symbols) in which paging DCI can be sent. A paging frame (PF) is a radio frame and may include one or more POs or the starting points of one or more POs.

[0181] In multi-beam operation, the UE assumes that the same paging message and the same short message are repeated in all transmission beams. The paging message is the same for both RAN initiated paging and CN initiated paging.

[0182] Upon receiving a RAN initiated paging, the UE initiates the RRC connection recovery procedure. Upon receiving a CN initiated paging in the RRC_INACTIVE state, the UE transitions to the RRC_IDL state and notifies the NAS of the CN initiated paging.

[0183] The PF and PO used for paging are determined as follows:

[0184] -PF's SFN is determined by the following formula:

[0185] (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N)

[0186] -The index i_s indicating the index of the PO is determined by the following formula:

[0187] i_s=floor(UE_ID / N)mod Ns

[0188] The following parameters can be used to calculate the above PF and i_s.

[0189] - T: DRX cycle of the UE (T is determined by the minimum of the UE-specific DRX value (if configured by RRC and / or upper layers) and the default DRX value broadcast in system information. In RRC_IDLE state, if UE-specific DRX is not configured by upper layers, the default value applies).

[0190] -N: total number of paging frames in T

[0191] -Ns: Number of POs of PF

[0192] -PF_offset: offset used for PF determination

[0193] -UE_ID: 5G-S-TMSI mod 1024

[0194] DRX (Discontinuous Reception)

[0195] (1)RRC_CONNECTEDDRX

[0196] Figure 8 is a diagram illustrating a DRX operation of a UE according to an embodiment of the present disclosure.

[0197] The UE may perform DRX operations in the procedures and / or methods described / proposed above. A UE configured with DRX can reduce power consumption by discontinuously receiving downlink signals. DRX may be performed in the RRC_IDLE state, the RRC_INACTIVE state, and the RRC_CONNECTED state. The UE performs DRX in the RRC_IDLE state and the RRC_INACTIVE state to discontinuously receive paging signals. DRX in the RRC_CONNECTED state (RRC_CONNECTED DRX) will be described below.

[0198] Reference Figure 8 , the DRX cycle includes an on-duration and a DRX opportunity. The DRX cycle defines the time interval between periodic repetitions of the on-duration. The on-duration is the time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the on-duration. When the UE successfully detects the PDCCH during the PDCCH monitoring period, the UE starts the inactivity timer and remains awake. Conversely, when the UE fails to detect any PDCCH during the PDCCH monitoring period, the UE transitions to a sleep state after the on-duration. Therefore, when DRX is configured, PDCCH monitoring / reception may be performed discontinuously in the time domain in the processes and / or methods described / proposed above. For example, when DRX is configured, the PDCCH reception timing (e.g., a time slot with a PDCCH SS) may be configured discontinuously according to the DRX configuration in an embodiment of the present disclosure. Conversely, when DRX is not configured, PDCCH monitoring / reception may be performed continuously in the time domain. For example, when DRX is not configured, the PDCCH reception timing (e.g., a time slot with a PDCCH SS) may be configured continuously in an embodiment of the present disclosure. Regardless of whether DRX is configured, PDCCH monitoring may be restricted to during time periods configured as measurement gaps.

[0199] Table 5 describes the DRX operation of a UE (in the RRC_CONNECTED state). Referring to Table 5, DRX configuration information is received via higher-layer signaling (e.g., RRC signaling), and DRX on / off is controlled via DRX commands from the MAC layer. Once DRX is configured, the UE may discontinuously perform PDCCH monitoring while executing the procedures and / or methods described / proposed above.

[0200] [Table 5]

[0201]

[0202] MAC-CellGroupConfig includes the configuration information required to configure MAC parameters for the cell group. MAC-CellGroupConfig may also include DRX configuration information. For example, MAC-CellGroupConfig may include the following information when defining DRX: -drx-OnDurationTimer value: defines the duration of the start period of the DRX cycle.

[0203] - Value of drx-InactivityTimer: defines the duration of the period during which the UE wakes up after detecting a PDCCH opportunity indicating a PDCCH for initial UL or DL ​​data.

[0204] -drx-HARQ-RTT-TimerDL value: defines the duration of the maximum time period after receiving a DL initial transmission until a DL retransmission is received.

[0205] -drx-HARQ-RTT-TimerDL value: defines the duration of the maximum time period after receiving a UL initial transmission grant until receiving a UL retransmission grant.

[0206] -drx-LongCycleStartOffset: defines the duration and start time of the DRX cycle.

[0207] -drx-ShortCycle (optional): defines the duration of the short DRX cycle.

[0208] When any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is running, the UE performs PDCCH monitoring in each PDCCH opportunity, remaining in the awake state.

[0209] (2)RRC_IDLEDRX

[0210] In the RRC_IDLE and RRC_INACTIVE states, DRX is used to discontinuously receive a paging signal. For simplicity, DRX performed in the RRC_IDLE (or RRC_INACTIVE) state will be referred to as RRC_IDLE DRX.

[0211] Therefore, if DRX is configured, PDCCH monitoring / reception may be performed discontinuously in the time domain when performing the above-described / proposed procedures and / or methods.

[0212] Figure 9 An exemplary DRX cycle for paging is shown.

[0213] Reference Figure 9 , DRX may be configured for discontinuous reception of paging signals. The UE may receive DRX configuration information from the base station through higher layer (e.g., RRC) signaling. The DRX configuration information may include configuration information related to the DRX cycle, DRX offset, DRX timer, etc. The UE repeats the on-duration and sleep-duration according to the DRX cycle. The UE may operate in awake mode during the on-duration and in sleep mode during the sleep-duration.

[0214] In wake-up mode, the UE may monitor the Paging Frame (PO) to receive a paging message. The PO refers to the time resource / interval (e.g., subframe or time slot) at which the UE expects to receive a paging message. PO monitoring includes monitoring the PDCCH (MPDCCH or NPDCCH) scrambled with the P-RNTI (hereinafter referred to as the paging PDCCH) on the PO. The paging message may be included in the paging PDCCH or the PDSCH scheduled by the paging PDCCH. One or more POs may be included in a paging frame (PF), and the PF may be periodically configured based on the UE ID. The PF may correspond to one radio frame, and the UE ID may be determined based on the UE's International Mobile Subscriber Identity (IMSI). When DRX is configured, the UE monitors only one PO per DRX cycle. When the UE receives a paging message indicating a change in its ID and / or system information on the PO, the UE may perform a RACH procedure to initialize (or reconfigure) the connection with the BS, or receive (or obtain) new system information from the BS. Therefore, in the above-described procedures and / or methods, PO monitoring may be performed discontinuously in the time domain to perform a RACH procedure for connecting to the BS or to receive (or obtain) new system information from the BS.

[0215] Figure 10 An extended DRX (eDRX) cycle is shown.

[0216] Depending on the DRX cycle configuration, the maximum cycle duration may be limited to 2.56 seconds. However, in the case of a UE that intermittently performs data transmission / reception (e.g., an MTC UE or an NB-IoT UE), unnecessary power consumption may occur during the DRX cycle. In order to further reduce the power consumption of the UE, a method of significantly extending the DRX cycle based on a power saving mode (PSM) and a paging time window or a paging transmission window (PTW) has been introduced. The extended DRX cycle is referred to as an eDRX cycle. Specifically, a paging superframe (PH) is periodically configured based on the UE ID, and a PTW is defined in the PH. The UE may perform a DRX cycle during the PTW duration to switch to a wake-up mode on its PO to monitor the paging signal. Figure 9One or more DRX cycles (eg, wake-up mode and sleep mode) may be included in the PTW duration. The number of DRX cycles in the PTW duration may be set by the BS through a higher layer (eg, RRC) signal.

[0217] WUS (Wake-up Signal) / PEI (Paging Early Indication)

[0218] In LTE Rel-15 Narrowband Internet of Things (NB-IoT) and Machine Type Communication (MTC), a wake-up signal (WUS) was introduced to save power of the UE. The WUS is a signal that indicates in advance whether there is an actual paging transmission in the paging SS at a specific location. When the BS wants to send paging in the PO at a specific location, the BS may send the WUS at the WUS transmission location associated with the PO. The UE monitors the WUS transmission location associated with the PO at a specific location. When the WUS at the WUS transmission location is detected, the UE may expect that paging will be sent in the PO, and when the WUS at the WUS transmission location is not detected, the UE may not expect paging in the PO. Energy saving gains can be achieved through this operation. In LTE Rel-16 NB-IoT and MTC, the UE group WUS was introduced to increase the energy saving gains of the Rel-15 WUS. By using the WUS transmission location and sequence determined based on the UE group ID of the UE, the UE group WUS can advantageously reduce the probability of unnecessary wake-up of the UE.

[0219] Figure 11 1 is a diagram showing a WUS in an LTE system. Figure 11In MTC and NB-IoT, WUS can be used to reduce power consumption associated with paging monitoring. WUS is a physical layer signal that indicates whether the UE should monitor the paging signal (e.g., MPDCCH / NPDCCH scrambled with P-RNTI) according to the cell configuration. For UEs that are not configured with eDRX (i.e., only configured with DRX), WUS can be associated with one PO (N=1). In contrast, for UEs configured with eDRX, WUS can be associated with one or more POs (N≥1). When WUS is detected, the UE can monitor N POs after associating with WUS. When WUS is not detected, the UE can maintain sleep mode by skipping PO monitoring until the next WUS monitoring. The UE can receive WUS configuration information from the BS and monitor WUS based on the WUS configuration information. The WUS configuration information may include, for example, the maximum WUS duration, the number of consecutive POs associated with WUS, and gap information. The maximum WUS duration may refer to the maximum time period in which WUS can be sent, and may be expressed as a ratio of the maximum number of repetitions (e.g., Rmax) related to the PDCCH (e.g., MPDCCH or NPDCCH). Although the UE may expect repeated WUS transmissions within the maximum WUS duration, the actual number of WUS transmissions may be less than the maximum number of WUS transmissions within the maximum WUS duration. For example, for UEs within good coverage, the number of WUS repetitions may be smaller. The resources / opportunities at which WUS can be sent within the maximum WUS duration are called WUS resources. WUS resources may be defined as a number of consecutive OFDM symbols × a number of consecutive subcarriers. WUS resources may be defined as a number of consecutive OFDM symbols × a number of consecutive subcarriers in a subframe or time slot. For example, WUS resources may be defined as 14 consecutive OFDM symbols × 12 consecutive subcarriers. When WUS is detected, the UE does not monitor WUS until the first PO associated with the WUS. When no WUS is detected during the maximum WUS duration, the UE does not monitor the paging signal in the PO associated with the WUS (or the UE remains in sleep mode).

[0220] In a communication system such as NR, a paging early indication (PEI) (e.g., sequence-based or DCI-based PEI) may be used to indicate whether the UE should monitor paging DCI in the PO or whether paging DCI is provided. When the UE successfully detects the PEI, the UE monitors the paging DCI (and / or the PDSCH carrying the corresponding paging message). When the PEI fails to be detected, the UE may skip monitoring the paging DCI in the PO.

[0221] RRM measurements based on receiver type

[0222] In this disclosure, based on the terminology used in standardization discussions related to the low-power wake-up signal (LP-WUS), the master radio is referred to as the MR and the low-power wake-up receiver (LP-WUR) is referred to as the LR. For the sake of distinction, the MR and LP-WUR that receive the signal for performing RRM measurements are referred to as receiver types.

[0223] MR refers to a general receiver for signal reception at an NR UE, and MR can be used to receive NR OFDM signals, etc. In other words, the receiver of the UE in the current NR standard can be understood as MR.

[0224] LP-WUR refers to a receiver newly added to the UE to receive low-power signals. Through LP-WUR, newly designed low-power signals such as LP-WUS or Low Power Synchronization Signal (LP-SS) can be received. Compared with MR, LP-WUR can have lower cost and lower power consumption.

[0225] Compared to MR signals having an OFDM symbol structure, low-power signals such as LP-WUS or LP-SS can be configured and transmitted differently in the time / frequency domain. For example, LP-WUS can be modulated using on-off keying (OOK) and aligned with the boundaries of time resources (e.g., time slots or symbols in the time domain), but can be transmitted without being aligned with the boundaries of frequency resources (e.g., REs or subcarriers in the frequency domain). For example, LP-WUS can be configured to indicate the presence or absence (1 / 0) of a signal within a specific duration, and the UE can receive the LP-WUS only through energy detection (or envelope detection) of the LP-WUS within the specific duration. The OOK symbols of the LP-WUS can be superimposed with i) a sequence for spectrum flattening, ii) an OFDM sequence for increasing transmission coverage, and / or iii) an OFDM sequence for transmitting additional information.

[0226] The UE needs to perform RRM measurements through the MR with a specific periodicity. If the RRM measurements through the MR can be replaced with RRM measurements based on LP-WUR, the power consumption of the UE can be significantly reduced. In other words, if the MR can remain in a power-off (or sleep) state for a longer duration without being enabled with a specific periodicity to perform RRM measurements, it may be very effective in reducing the power consumption of the UE. In order to meet the battery life requirements of the UE, it is expected that eDRX with a long cycle can be configured. However, in this case, high latency may not be avoided, so it may not be suitable for services that require both low latency and long battery life. Therefore, the discussion of LP-WUS may be about an ultra-low power mechanism that meets lower latency than eDRX.

[0227] A UE in an RRC idle / inactive state typically needs to wake up at least once per DRX cycle to receive a signal, and this operation contributes significantly to power consumption during periods without signaling or data traffic. If the UE can receive signals (e.g., paging) at a longer period (e.g., in each NDRX cycle rather than each DRX cycle), power consumption can be significantly reduced. This can be supported by having the LP-WUR operating at ultra-low power replace and perform at least part of the signal reception that the MR should perform. In other words, since RRM measurements on the LR can consume less power than RRM measurements on the MR, if at least part of the RRM measurements of the MR are replaced by the RRM measurements of the LR, there can be a power saving effect for the UE.

[0228] The LP-WUS / LP-WUR discussion has agreed to introduce an "ultra-deep sleep" power state for MR, a state with very low power consumption. The starting point for the discussion is agreed to be the ultra-deep sleep state, with a relative power of 0.015, similar to the power-off state. Table 6 summarizes the discussion from the recent standardization meeting. In this case, the relative power is the relative value of MR being set to 1 in the deep sleep state, as described in TR 38.840.

[0229] [Table 6]

[0230]

[0231] Various scenarios and candidate technologies based on LP-WUS / LP-WUR are under discussion. The longer the MR remains in a power-off state (or ultra-deep sleep state), the greater the benefit in terms of power saving. A UE in an RRC idle / inactive state should periodically perform RRM measurements to handle mobility. RRM measurements are generally defined as being performed at least once per DRX cycle. Therefore, if the UE can perform RRM measurements based on the MR with a periodicity longer than the current cycle, significant power consumption reduction can be expected. To this end, replacement or offloading of RRM measurements based on LP-WUS / LP-WUR can be considered.

[0232] The present disclosure proposes a method for performing RRM measurements based on LP-WUR to reduce power consumption caused by the RRM measurements of the UE, and a method for assisting the MR based on the results of the RRM measurements. In addition, the present disclosure proposes a configuration, indication and UE operation for reducing the RRM measurements of the MR based on LP-WUS and / or LR. In addition, the present disclosure proposes a method for the UE to switch between RRM measurements on the MR and RRM measurements on the LR. The method may be based on measurement results obtained by each receiver or on clear indications through separate signals. In addition, the present disclosure proposes a configuration and UE operation for preventing the situation where the MR of the UE remains inactive for too long and fails to receive the group-common DCI that the UE originally needs to receive due to the proposal of the present disclosure.

[0233] The following description is based on periodic RRM measurements, but the proposed method is not limited to this and can also be applied to all signals received by the UE with a specific periodicity. Hereinafter, a state in which a signal is not fully received on the MR may refer to at least one of a power-off state and an ultra-deep sleep state, for which a specific transition time may be required.

[0234] The UE performs RRM measurements on the serving cell at least once per M1*N1 DRX cycle. Typically, RRM measurements may involve measuring the RSRP and RSRQ of a specific signal (e.g., SSB) and calculating the cell selection RX level (i.e., Srxlev) based on this. The following table 7 shows a detailed description excerpted from TS38.133.

[0235] [Table 7]

[0236]

[0237] For ease of explanation, it is assumed that the DRX cycle is greater than 0.64 seconds, the SMTC periodicity is less than 20 ms, and FR1 (M1=1 and N1=1) is used. Based on these assumptions, the UE may perform RRM measurements every DRX cycle.

[0238] In the following, it is assumed that RRM measurement is performed every DRX cycle, but the proposed methods are not limited thereto, and these methods can also be applied to the operation of performing RRM measurement every N1*M1*DRX cycle.

[0239] The following examples are based on DRX in NR systems, but the application of the proposed methods is not limited to NR systems or UEs supporting DRX. In the following description, the distinction between methods or options is intended to provide clarity, and each method or option should not be construed as limited to independent implementation. For example, the methods / options described below can be implemented individually, but at least some of the methods / options can also be implemented in combination, to the extent that the methods / options do not conflict with each other.

[0240] [Proposal 1] Receiver switching for UEs performing RRM measurements

[0241] A method for switching a UE between RRM measurements on the MR and RRM measurements on the LR is proposed. Switching between the MR and a low-power wake-up receiver is referred to as receiver switching. Regarding RRM measurements, measurements on the serving cell (camped cell) and neighboring cells are not described separately, but are primarily applicable to measurements on the serving cell.

[0242] UEs that do not have LP-WUS / LP-WUR implemented perform RRM measurements with the MR at a specific periodicity (e.g., every DRX cycle). If LP-WUS / LP-WUR is introduced and all or part of the MR's RRM measurements are replaced with LR RRM measurements, the UE's overall power consumption can be reduced. Therefore, a reference value for using LR RRM measurement results, such as the cell selection RX level (Srxlev), can also be defined.

[0243] To this end, the MR's RRM measurements and the LR's RRM measurements can be switched between each other. This may mean that the UE switches from the MR to the LR or vice versa to perform RRM measurements. This switching can be performed if the RRM measurement results obtained by the UE using each receiver (MR or LR) are good enough and the reliability is above a threshold.

[0244] For example, if the UE is able to perform RRM measurements with MR a certain number of times or more, and if the measurement result / reliability is greater than a threshold, the UE may determine that the current cell coverage and channel conditions are good enough to perform RRM measurements with low-power LR. Therefore, the UE may switch the RRM measurement with MR to the RRM measurement with LR.

[0245] Furthermore, if the UE is currently performing RRM measurements using the LR, but the measurement result / reliability is less than a threshold, the UE may determine that due to poor channel conditions, the UE needs to stop using low-power LR measurements and switch to MR for RRM measurements. Even if the UE determines to switch from LR to MR, this does not necessarily mean an increase in total power consumption. Since the UE has already performed a portion of the overall RRM measurements that should have been performed using MR using the LR, and the switch from LR to MR is performed due to an issue with the LR's RRM measurement results, total power consumption does not increase. In other words, it can be said that after power consumption has been reduced due to measurement issues with the LR operating at low power, the RRM measurements simply return to their original state.

[0246] Handover based on RRM measurements

[0247] The UE performs RRM measurements on MR at least once per M1*N1 DRX cycle. In the example, a simple case of M1=1 and N1=1 is assumed.

[0248] If the UE determines that the measurement result of the MR exceeds a specific threshold (reference value) and the reliability is greater than or equal to a specific required level, the UE deactivates the MR (powers off or ultra-deep sleep) and uses the LR to perform RRM measurements. This may be a result of determining that it is acceptable to perform measurements using the LR, which consumes significantly less power, if the RRM measurement result of the currently measured cell is higher than the threshold (even if the measurement accuracy / reliability is not very good). The specific threshold (reference value) may be predetermined or configured / indicated by a higher layer. In addition, the reference value of the MR's measurement result and the reference value of the LR's measurement result may be the same or different, and the reference values ​​may be indicated / configured separately. For example, the reference value of the LR's measurement result may be determined as a value obtained by multiplying the reference value of the MR's measurement result by a specific coefficient.

[0249] If the UE determines that the LR measurement result does not exceed a specific threshold, is less reliable than a specific required level, or is of poor quality, the UE enables MR to perform MR RRM measurement. This may be the result of determining that it is difficult to fully trust the LR RRM measurement result, which consumes significantly less power, and therefore that MR RRM measurement should be performed even if it consumes more power, because the measurement accuracy is lower than the specific required level due to reasons such as coverage issues or unstable channels of the currently measured cell.

[0250] The criteria for determining the reliability of measurement results can be configured. For example, if the variance of the results across N measurement instances exceeds a certain level, the reliability can be determined to be insufficient or the quality of the results to be poor. Alternatively, if the results across N RRM measurement instances include more than a certain number of results that do not exceed a threshold, this can also be considered to be the case. As another approach, if the measurement result is below a certain ratio compared to the average of the MR's RRM measurement results, the reliability or quality can be determined to be insufficient. This can be useful when using previously performed MR RRM measurements or when the UE is not in a cell reselection or mobility situation.

[0251] In other words, the UE may switch receivers (MR or LR) based on the results of RRM measurements performed with each receiver. In this case, the specific thresholds (reference values) used to determine switching from LR to MR and from MR to LR may be the same or different.

[0252] The specific threshold (reference value) used by the UE to determine handover between MR and LR may need to take into account factors such as the coverage difference between MR and LR, the quality of LR measurement results, and issues caused by the low cost of LR. Since LR assumes low-cost and low-power reception, LR generally consumes less receive power or receives signals with a lower SNR than MR. Therefore, assuming the same receive power consumption and SNR, LR can be expected to have a relatively smaller coverage range than MR. In addition, since LR is assumed to be implemented at low cost, the quality and reliability of measurement results when measuring signals may be lower than MR. Therefore, since there may be differences between the two receivers, the threshold used as the basis for handover can be determined by reflecting these differences.

[0253] If, because the UE is located at the cell edge, it is determined that the results of RRM measurements performed not only by the LR but also by the MR will have poor quality, switching can be determined based on compensation for the results. In other words, if the UE is performing RRM measurements in the LR but anticipates that switching to the MR for RRM measurements will still result in poor measurement quality, immediate switching may not improve the RRM measurement results, which may be disadvantageous in terms of power consumption. This compensation can be determined in the form of an offset based on the quality of the most recent LR and MR measurement results. If the quality of the most recent LR and MR measurement results is below respective thresholds (which may be due to poor coverage or channel conditions), the UE can apply an offset to the specific threshold used to determine LR switching and configure a new reference value.

[0254] This may include notifying the BS of the UE's actual handover status. The handover status may be provided directly via UL transmission. Alternatively, RRM measurement results below a reference value used as a basis for handover determination may be reported. Alternatively, the UE may notify the BS of the quality of RRM measurements performed using LR or MR.

[0255] Switching of the transmission periodicity or frequency of the signal based on which RRM measurements can be performed

[0256] The UE may switch to a receiver for performing RRM measurements based on the transmission periodicity or frequency of a signal that the UE is capable of performing measurements based on the transmitted LP-WUS or LR. LP-SS can be considered a signal that can be received using LR, which refers to an additional synchronization signal for receiving LP-WUS using LR. For example, if the UE is performing RRM measurements using MR and there are more than a certain number of opportunities for expected LP-WUS reception during a certain time period, the UE may switch to LR and then perform RRM measurements. In this case, the above-mentioned specific threshold value may be used as an auxiliary metric for determining whether to switch to LR. This may be a result of determining that sufficient measurement results and reliability (compared to when performing RRM measurements using MR) can be ensured if there are sufficient signals available for performing RRM measurements using LR while the UE is performing RRM measurements using MR.

[0257] On the other hand, if the UE is performing RRM measurements using the LR, but the number of opportunities for LP-WUS reception expected during a specific time period falls below a specific threshold, the UE may switch to the MR and then perform RRM measurements. That is, although the UE is performing RRM measurements using the LR, if it is determined that insufficient signals are expected to be received via the LR and that sufficient measurement results and reliability are difficult to ensure, the UE may determine to enable the MR to perform RRM measurements.

[0258] The transmission periodicity or frequency of the LP-WUS can be based on the MR DRX cycle configured for the UE. Assuming that the periodicity required for UEs not configured with LP-WUS / LP-WUR to perform MR RRM measurements is the DRX cycle, the UE can determine whether to switch to performing LR RRM measurements based on the ratio of LP-WUS transmissions relative to the DRX cycle. For example, if the LP-WUS is expected to be transmitted N times or more within a DRX cycle, the UE can perform LR RRM measurements N times during the time it is capable of performing one MR RRM measurement. Therefore, even if the reliability of the measurement results is slightly insufficient, the accuracy of the measurement results can be improved by repeatedly performing LR RRM measurements N times.

[0259] In addition to the LP-WUS, other synchronization signals (e.g., LP-SS) may exist on which the UE can perform LR RRM measurements. These signals may be transmitted with the same or different periodicities. If the UE is capable of performing LR RRM measurements on all signals, the UE may calculate the frequency of the signals available for LR RRM measurements relative to the DRX cycle of the MR based on the sum of the transmission frequencies of the individual signals.

[0260] If the UE anticipates that a target signal (LP-WUS or LP-SS) for which the UE can perform RRM measurements using the LR will be received more frequently than a specific frequency, the UE can freely determine which of the LR and MR receivers to use for RRM measurements. In other words, if there are sufficient target signals so that RRM measurements using the LR do not cause any problems, the UE may perform measurements using the LR receiver even if the reliability of the RRM measurement results is relatively low, in order to save power. Alternatively, the UE may perform measurements using the MR receiver even if it consumes more power to obtain more accurate results. Regardless of which receiver is used for RRM measurements, cell quality can be determined based on the measurement results.

[0261] The UE may determine whether to trigger the MR to wake up based on the measurement results of the LR. As in the RRM measurement of the MR, the RRM measurement of the LR may also need to be performed at least once per a defined measurement periodicity (usually N1*M1*DRX cycle).

[0262] This may include an operation of notifying the BS of the actual handover status of the UE. The handover status may be provided directly via UL transmission. Alternatively, the UE may inform the BS of the quality of the RRM measurement results performed using LR or MR.

[0263] Switching based on explicit instructions

[0264] The UE can perform switching between MR and LR based on receipt of an explicit instruction. For example, if the BS requires highly accurate RRM measurement results using MR for the UE, the BS can indicate highly accurate RRM measurement results. This can be indicated in the form of higher layer signaling (RRC), DCI, or MAC CE.

[0265] The above-mentioned handover operation based on RRM measurement results and the handover operation based on the transmission frequency of the signal that can be used for RRM measurement can also be performed based on explicit instructions. In this case, the UE can report the basis for determining whether handover is required to the BS, and the BS can determine whether to perform handover based on the report and directly instruct the UE whether to perform handover.

[0266] [Proposal 2] Hybrid RRM of LR and MR

[0267] If the UE is capable of performing RRM measurements using LR, the UE may perform RRM measurements using both LR and MR. A method may be considered in which measurements are performed based on two receivers and the results are used together. In this disclosure, this method is referred to as hybrid RRM measurement or hybrid measurement.

[0268] The UE performs RRM measurement by receiving SSB (or CSI-RS) using MR, and performs RRM measurement by receiving LP-WUS or LP-SS using LR. When the respective results are referred to as MR results and LR results, the two results may be combined or mixed to determine a single final result of the RRM measurement (result of the mixed measurement). For example, the final result may be derived as a linear combination of the MR result and the LR result, and the final result may be compared with a linear combination of a reference of the MR result and a reference of the LR result. In other words, a linear combination of the Srxlev of the MR and the Srxlev of the LR may be compared with the result of the mixed measurement.

[0269] As in the above example, the MR result and the LR result may be calculated together in a form such as a weighted sum. When the MR result and the LR result are combined into a single value, the weights of the MR result and the LR result may be the same or different.

[0270] Therefore, if the periodicity of the expected reception of LP-WUS (or LP-SS) is shorter than a threshold, the UE can perform RRM measurements using both LR and MR and calculate the results together. Alternatively, after the UE switches from LR to MR or vice versa, the UE can use previously measured RRM measurement results as auxiliary information to derive more accurate results. For example, if the UE performs RRM measurements after switching from LR to MR, the UE can derive a weighted sum by assigning a lower weight to the previous LR results.

[0271] Alternatively, RRM measurements for both the MR and LR can be determined by a configured periodicity. To prevent the UE from not performing MR RRM measurements for extended periods, the MR can be enabled to perform RRM measurements at a specific periodicity, even in the absence of a handover indication. In this case, the periodicity can be more relaxed than for general MR RRM measurements. For example, while MR RRM measurements are performed every DRX cycle in the prior art, the proposed method can increase the periodicity so that MR RRM measurements are performed every N DRX cycles. Furthermore, this can help reduce or prevent paging delays and failures caused by other power-saving techniques based on LP-WUS.

[0272] [Proposal 3] Target signals and requirements for RRM measurements based on receiver type

[0273] The requirements for RRM measurements may differ depending on the type of receiver (MR or LR) used by the UE to perform RRM measurements.

[0274] If the UE does not support LP-WUS / LP-WUR, the UE performs RRM measurements on the SSB using MR. If the UE supports LP-WUS / LP-WUR, signals that can be used for RRM measurements may include LP-WUS and LP-SS. This may be due to the characteristics of LR. In addition, the following sequence signals: PSS or SSS in SSB may also be candidates. In addition to sequence signals, CSI-RS, TRS, etc., which are usually configured for the UE, can also be used.

[0275] The LP-WUS (and LP-SS) that the UE can receive can be located relative to the SSB in the time / frequency domain. This may be intended to facilitate SSB reception after MR is enabled via LP-WUS reception. For example, the LP-WUS (and LP-SS) can be located a few slots or milliseconds before each periodically transmitted SSB, either within the same frequency range or within different frequency ranges.

[0276] It is assumed that the UE is capable of performing RRM measurements on SSB using both MR and LR. In this case, RRM measurements on SSB using LR can be limited to part of the SSB signal (PSS or SSS), or can cover all signals. RRM measurements on SSB using LR may depend on the capabilities of the UE.

[0277] The UE can also perform RRM measurements on the currently used RS (e.g., CSI-RS, TRS, etc.). UE-specific RSs can be configured commonly for multiple UEs. In this case, RSs can be commonly configured for UEs capable of performing RRM measurements only using MRs, and cell quality can be measured using the corresponding RSs. Furthermore, RRM measurements on RSs using LRs can be based on the UE's capabilities or configured by the base station.

[0278] If the SSB is used for RRM measurements with both MR and LR, different receivers may be used depending on the UE. This may be due to the UE's capabilities or instructions from the BS. In addition, as described above, if RRM measurements on the SSB are performed using LR, RRM measurements may be performed only on a portion of the signal (e.g., PSS / SSS, rather than the entire SSB). In such cases, a requirement may be configured to measure the SSB using LR more frequently than the requirement for measuring the SSB using MR (in the example of Table 6, every DRX cycle).

[0279] [Proposal 4] UE operation during MR's enabled time

[0280] If the UE enables MR, a specific transition time may be required. The transition time may vary depending on whether the MR power state is deep sleep or ultra-deep sleep state, as shown in Table 6 above, and may take a relatively long time.

[0281] During the MR transition time, the UE may perform RRM measurements using the LR and use the results together as a result of hybrid measurement.

[0282] Alternatively, when switching from LR to MR, if the MR transition time is longer than a threshold, the UE may not perform any operations related to RRM measurement. This is because if the transition time is longer than the threshold, the RRM measurement results of the LR may not be meaningful for cell quality measurement or may be outdated.

[0283] [Proposal 5] MR Enablement for Receiving Group Common DCI

[0284] If the UE keeps MR deactivated for longer than a predefined / preconfigured time or timer, the UE may fail to receive control information necessary for UE operation (e.g., DCI in the group-common PDCCH). To avoid this problem, an operation can be defined to forcibly activate MR with a specific periodicity. This can be similar to the operation proposed in Proposal 2 above. The UE activates MR with a specific periodicity, performs RRM measurements, and receives group-common DCI. This periodicity can be configured, indicated, or predetermined by the BS, so that the BS can know in advance when the UE will activate MR and send DCI accordingly.

[0285] Alternatively, a group-common WUS can be defined to enable the MR to receive DCI. The group-common WUS can be received by the UE using the LR and can be sent in the form of an LP-WUS. The indicator in the LP-WUS (e.g., the UE ID or UE group (or subgroup) ID carried in the LP-WUS payload, or in the form of a separate indicator) can define which UE (or UEs within a specific group or subgroup) needs to be woken up.

[0286] Figure 12 Receiver type switching for transitioning between LR RRM measurements and MR RRM measurements according to an embodiment is shown.

[0287] Reference Figure 12 , the UE performs RRM measurements (FG101 or FG103) using LP-WUR or MR. The UE may perform RRM measurements by receiving signals via LP-WUR or MR, and after switching to another receiver, the UE may perform RRM measurements (FG103) by receiving signals. The switching operation may be triggered based on the result of the RRM measurement or based on the transmission periodicity or frequency of the signal that can be used for RRM measurement. Alternatively, the switching operation may be triggered by an explicit indication. The UE may repeatedly perform the operations of performing RRM measurements using one of the two receivers, switching to the other receiver, and then performing RRM measurements. Therefore, the UE can select the optimal balance between the quality of the RRM measurement results and the reduction of power consumption.

[0288] The UE can perform RRM measurements by switching between MR and LP-WUR. Therefore, the UE can replace (part of) the RRM measurements performed with conventional MR or increase their periodicity, thereby significantly reducing power consumption.

[0289] Figure 13 1 is a diagram for explaining operations of a network and a UE related to RRM measurement in a wireless communication system according to an embodiment.

[0290] Reference Figure 13 , the UE may receive an RRC message from the network in RRC connected mode. The RRC message may indicate that the UE needs to enter RRC inactive mode (A05).

[0291] The UE may enter the RRC inactive mode from the RRC connected mode (A10).

[0292] While the MR is in the sleep / off state (A20), the UE may perform RRM measurements on the LP-WUS using the LR (A15).

[0293] If the result of the LR RRM measurement does not meet the threshold, that is, if the conditions required to maintain the RRC inactive mode are not met, the UE may return to the RRC connected mode (A25) and perform MR RRM measurement (A31) based on the DL signal received (A30) through the MR.

[0294] Figure 14 It is a diagram for explaining the operation of the UE according to an embodiment.

[0295] Reference Figure 14 , the UE may perform the second type RRM measurement in the second mode supporting only the second type signal among the first type signal and the second type signal (B05).

[0296] The UE may switch from the second mode to the first mode supporting the first type of signal based on the second type RRM measurement (B10).

[0297] The UE may perform a first type of RRM measurement in the first mode (B15).

[0298] Based on the result of the second type RRM measurement being below a threshold, switching from the second mode to the first mode may be performed.

[0299] The second type RRM measurement may be performed periodically.Based on the periodically performed second type RRM measurement, the first type RRM measurement may be deactivated, or the periodicity of the first type RRM measurement may be increased.

[0300] The first type RRM measurements and the second type RRM measurements may be performed on different signals.

[0301] The second type of RRM measurements may be performed based on the WUS provided as the second type of signal.

[0302] Based on the number of opportunities for the second type RRM measurement being set to be less than a specific value, switching from the second mode to the first mode may be performed.

[0303] The measurement result value may be calculated based on a combination of the result of the second type RRM measurement and the result of the first type RRM measurement.

[0304] Both the first type RRM measurements and the second type RRM measurements may be performed in the first mode.

[0305] The first type of signal may be an OFDM-based signal, and the second type of signal may be a non-OFDM-based signal.

[0306] Figure 15 is a diagram for explaining the operation of a BS according to an embodiment.

[0307] Reference Figure 15 , the BS may separately transmit the first type signal and the second type signal based on respective periodicities (C05).

[0308] The BS may receive information about the second type RRM measurement from the UE operating in the second mode supporting only the second type signal ( C10 ).

[0309] The BS may receive information about the first type RRM measurement from the UE after the UE switches from the second mode to the first mode supporting the first type signal ( C15 ).

[0310] Based on the result of the second type RRM measurement being lower than the threshold, the BS may determine that the UE switches from the second mode to the first mode.

[0311] The BS may configure the UE to periodically perform the second type RRM measurement. Based on the periodically performed second type RRM measurement, the first type RRM measurement may be deactivated, or the periodicity of the first type RRM measurement may be increased.

[0312] The first type RRM measurements and the second type RRM measurements may be performed on different signals.

[0313] The BS may configure the UE to perform the second type RRM measurement based on the WUS provided as the second type signal.

[0314] The BS may determine that the UE switches from the second mode to the first mode based on the number of occasions for the second type RRM measurement being set to be less than a specific value.

[0315] The BS may receive information about a measurement result value based on a combination of a result of the second type RRM measurement and a result of the first type RRM measurement from the UE.

[0316] The BS may configure the UE to perform both the first type RRM measurement and the second type RRM measurement in the first mode.

[0317] The first type of signal may be an OFDM-based signal, and the second type of signal may be a non-OFDM-based signal.

[0318] Figure 16 A communication system 1 applied to the present disclosure is shown.

[0319] Reference Figure 16 , a communication system 1 applied to the present disclosure includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, and the like. Handheld devices may include smartphones, smart pads, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0320] Wireless devices 100a to 100f can connect to network 300 via BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS 200 / network 300, wireless devices 100a to 100f can perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0321] Wireless communication / connections 150a, 150b, or 150c may be established between wireless devices 100a to 100f / BS 200 or BS 200 / BS 200. Here, wireless communication / connections may be established via various RATs (e.g., 5G NR), such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device may transmit / receive radio signals to / from each other via the wireless communication / connections 150a and 150b. For example, the wireless communication / connections 150a and 150b may transmit / receive signals via various physical channels. To this end, at least a portion of various configuration information for configuring processes for transmitting / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes may be performed based on various proposals of the present disclosure.

[0322] Figure 17 A wireless device suitable for use with the present disclosure is shown.

[0323] Reference Figure 17 , the first wireless device 100 and the second wireless device 200 can transmit radio signals through various RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 16 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0324] The first wireless device 100 may include 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 may control the memory 104 and / or the transceiver 106 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. For example, the processor 102 may process information within the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including commands for executing some or all of the processes controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. Herein, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In embodiments of the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0325] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may also include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. For example, the processor 202 may process information within the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including commands for executing some or all of the processes controlled by the processor 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. Herein, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In embodiments of the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0326] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0327] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, commands and / or command sets using firmware or software.

[0328] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies, such as wired or wireless connections.

[0329] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operational flowcharts of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, one or more processors 102 and 202 may execute control so that one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may execute control so that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals so that the received user data, control information, radio signals / channels, etc. may be processed using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0330] Figure 18 Another example of a wireless device applicable to the present disclosure is shown. The wireless device can be used according to the usage / service (refer to Figure 16 ) are implemented in various forms.

[0331] Reference Figure 18 , the wireless devices 100 and 200 may correspond to Figure 17The wireless devices 100 and 200 may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 17 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Figure 17 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 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. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 via a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 via the wireless / wired interface in the memory unit 130.

[0332] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in accordance with, but not limited to, a robot ( Figure 16 100a), vehicles ( Figure 16 100b-1 and 100b-2), XR devices ( Figure 16 100c), handheld device ( Figure 16 100d), household appliances ( Figure 16 100e), IoT devices ( Figure 16 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 16 400), BS( Figure 16 200), network nodes, etc. The wireless device can be used in a mobile or fixed location depending on the use case / service.

[0333] exist Figure 18In the wireless devices 100 and 200, the various elements, components, units / portions, and / or modules may all be connected to each other via a wired interface, or at least a portion thereof may be wirelessly connected via the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected via the communication unit 110. The various elements, components, units / portions, and / or modules within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0334] Figure 19 A vehicle or autonomous driving vehicle applicable to the present disclosure is shown. The vehicle or autonomous driving vehicle can be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0335] Reference Figure 19 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Figure 18 Blocks 110 / 130 / 140.

[0336] The communication unit 110 can send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, base stations (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling components of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a can enable the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering system, etc. The power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include wired / wireless charging circuits, a battery, etc. The sensor unit 140c can acquire vehicle status, surrounding environment information, user information, etc. The sensor unit 140 c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a location module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a depth sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140 d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting the speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a path if a destination is set, etc.

[0337] For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving path and driving plan based on the obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 may aperiodically or periodically obtain recent traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c may obtain vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly obtained data / information. The communication unit 110 may transmit information regarding the vehicle's location, autonomous driving path, and / or driving plan to the external server. The external server may predict traffic information data based on information collected from the vehicle or autonomous driving vehicle using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0338] The above-mentioned embodiments correspond to the combination of elements and features of the present disclosure in a prescribed form. Furthermore, unless explicitly mentioned, each element or feature may be considered as optional. Each element or feature may be implemented in a form that is not combined with other elements or features. In addition, it is possible to implement the embodiments of the present disclosure by partially combining elements and / or features together. The order of operations described for each embodiment of the present disclosure may be modified. Some configurations or features of an embodiment may be included in another embodiment, or may replace the corresponding configuration or features of another embodiment. Furthermore, the embodiments may be configured by combining claims that do not have a clear reference relationship in the appended claims, or may be included as new claims by amendment after submitting the application.

[0339] Those skilled in the art will appreciate that the present disclosure may be implemented in other specific forms than those set forth herein without departing from the spirit and essential characteristics of the present disclosure. The above-described embodiments are therefore to be construed in all respects as illustrative and not restrictive. The scope of the present disclosure is to be determined by the appended claims and their legal equivalents, not by the foregoing description, and all changes coming within the meaning and range of equivalence of the appended claims are intended to be encompassed therein.

[0340] Industrial Applicability

[0341] The present disclosure is applicable to UE, BS or other devices in a wireless mobile communication system.

Claims

1. A method for measuring a signal by a user equipment (UE) in a wireless communication system, the method comprising the following steps: performing a second type of radio resource management (RRM) measurement in a second mode supporting only the second type of signal among the first type of signal and the second type of signal; switching from the second mode to a first mode supporting the first type of signal based on the second type of RRM measurements; as well as performing a first type of RRM measurements in said first mode, Wherein, switching from the second mode to the first mode is performed based on the result of the second type RRM measurement being lower than a threshold.

2. The method according to claim 1, wherein The second type RRM measurements are performed periodically, and Based on the periodically performed second type RRM measurement, the first type RRM measurement is disabled, or the periodicity of the first type RRM measurement is increased.

3. The method according to claim 1, wherein The first type RRM measurements and the second type RRM measurements are performed on different signals.

4. The method according to claim 3, wherein: The second type RRM measurement is performed based on a wake-up signal WUS provided as the second type signal.

5. The method according to claim 1, wherein Based on the number of opportunities for the second type RRM measurement being set to be smaller than a specific value, switching from the second mode to the first mode is performed.

6. The method according to claim 1, wherein A measurement result value is calculated based on a combination of a result of the second type of RRM measurement and a result of the first type of RRM measurement.

7. The method according to claim 1, wherein In the first mode, both the first type RRM measurements and the second type RRM measurements are performed.

8. The method according to claim 1, wherein The first type of signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal, and The second type of signal is a non-OFDM based signal. 9 . A computer-readable recording medium having recorded thereon a program for executing the method according to claim 1 .

10. An apparatus for wireless communication, the apparatus comprising: a memory configured to store instructions; as well as a processor configured to perform operations by executing the instructions, The operation of the processor includes: performing a second type of radio resource management (RRM) measurement in a second mode supporting only the second type of signal among the first type of signal and the second type of signal; switching from the second mode to a first mode supporting the first type of signal based on the second type of RRM measurements; and performing a first type of RRM measurements in said first mode, Wherein, switching from the second mode to the first mode is performed based on the result of the second type RRM measurement being lower than a threshold.

11. The device according to claim 10, further comprising: a primary radio MR receiver configured to receive signals of the first type; as well as A low power wake-up radio (LP-WUR) receiver is configured to receive the second type of signal.

12. The device according to claim 10, wherein The device is a user equipment (UE) operating in a wireless communication system or a processing device configured to control the UE.

13. A method performed by a base station (BS) via a signal in a wireless communication system, the method comprising the following steps: sending the first type signal and the second type signal separately based on respective periodicities; receiving information about a second type of radio resource management (RRM) measurement from a user equipment (UE) operating in a second mode supporting only the second type of signal; as well as receiving information about first-type RRM measurements from the UE after the UE switches from the second mode to a first mode supporting the first type of signal, The BS determines that the UE switches from the second mode to the first mode based on that a result of the second type RRM measurement is lower than a threshold.

14. A base station (BS) for wireless communication, the BS comprising: a memory configured to store instructions; as well as a processor configured to perform operations by executing the instructions, The operation of the processor includes: sending the first type signal and the second type signal separately based on respective periodicities; receiving information about second type radio resource management (RRM) measurements from a user equipment (UE) operating in a second mode supporting only the second type of signal; and receiving information about first-type RRM measurements from the UE after the UE switches from the second mode to a first mode supporting the first type of signal, Wherein, based on the result of the second type RRM measurement being lower than a threshold, the processor is configured to determine that the UE switches from the second mode to the first mode.

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