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

Abstract

A method by which a terminal receives a signal in a wireless communication system according to one embodiment of the present disclosure comprises the steps of: receiving a plurality of discontinuous reception (DRX) configurations; receiving physical downlink control channel (PDCCH) monitoring adaptation information related to at least one of the plurality of DRX configurations; and monitoring the PDCCH on the basis of each DRX ON duration of the plurality of DRX configurations and PDCCH monitoring adaptation information, in which the PDCCH is monitored on the basis of an interval or overlap between a first duration of a first DRX configuration and a second duration of a second DRX configuration among the plurality of DRX configurations, the first PDCCH may be monitored based on the first PDCCH monitoring adaptation information in both the first duration and the second duration.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting or receiving an uplink / downlink signal in a wireless communication system. Background Art

[0002] In general, wireless communication systems are developing to cover a wide range in various ways to provide communication services such as audio communication services, data communication services, etc. 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, the multiple access system can 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 efficiently performing a wireless signal transmission / reception process.

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

[0006] Technical Solution

[0007] According to one aspect, a method for receiving a signal by a user equipment (UE) in a wireless communication system may include the following steps: receiving a plurality of discontinuous reception (DRX) configurations; receiving physical downlink control channel (PDCCH) monitoring adaptation information related to at least one of the plurality of DRX configurations; and monitoring the PDCCH based on the respective DRX on-durations of the plurality of DRX configurations and the PDCCH monitoring adaptation information. Based on a gap or overlap between a first time period of a first DRX configuration and a second time period of a second DRX configuration in the plurality of DRX configurations, monitoring of a first PDCCH may be performed jointly during the first time period and the second time period based on the first PDCCH monitoring adaptation information.

[0008] Based on the fact that the first time period and the second time period at least partially overlap, monitoring of the first PDCCH may be performed throughout the first time period and the second time period based on the first PDCCH monitoring adaptation information.

[0009] Based on the second time period starting within a predetermined time from the end of the first time period, the monitoring of the first PDCCH started in the first time period may be performed until the end of the second time period.

[0010] The first PDCCH monitoring adaptation information may be related to the first DRX configuration. The first time period may be the DRX on duration or the DRX active time of the first DRX configuration, and the second time period may be the DRX on duration or the DRX active time of the second DRX configuration. The first time period may start earlier than the second time period.

[0011] Monitoring of the second PDCCH may be performed based on the second PDCCH monitoring adaptation information during a third time period of the second DRX configuration that is different from the second time period.

[0012] The first PDCCH monitoring adaptation information may be used to skip monitoring of at least one search space set among the search space sets configured for the UE or to monitor a first group of search space sets.

[0013] The first time period of the first DRX configuration and the second time period of the second DRX configuration may be configured according to different DRX cycles.

[0014] According to another aspect, there may be provided a computer-readable recording medium storing a program for executing the above-described method of receiving a signal.

[0015] According to another aspect, the above-mentioned UE may be provided.

[0016] According to another aspect, a signal processing apparatus configured to control the above-mentioned UE may be provided.

[0017] According to another aspect, a method for transmitting a signal by a base station (BS) in a wireless communication system may include the following steps: transmitting a plurality of DRX configurations; transmitting PDCCH monitoring adaptation information related to at least one of the plurality of DRX configurations; and transmitting a PDCCH based on the respective DRX on-durations of the plurality of DRX configurations and the PDCCH monitoring adaptation information. Based on a gap or overlap between a first time period of a first DRX configuration and a second time period of a second DRX configuration among the plurality of DRX configurations, transmission of a first PDCCH may be performed jointly during the first time period and the second time period based on the first PDCCH monitoring adaptation information.

[0018] According to another aspect, there may be provided a computer-readable recording medium storing a program for executing the above-described method of transmitting a signal.

[0019] According to another aspect, the above-mentioned BS may be provided.

[0020] Beneficial Effects

[0021] According to the embodiments, signals can be transmitted / received more accurately and efficiently in a wireless communication system.

[0022] Other technical effects can be derived from the embodiments disclosed in the detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 2 Shows the radio frame structure.

[0025] Figure 3 A resource grid showing time slots.

[0026] Figure 4 An exemplary mapping of physical channels in time slots is shown.

[0027] Figure 5 An exemplary physical downlink control channel (PDCCH) transmission and reception process is shown.

[0028] Figure 6 An exemplary physical downlink shared channel (PDSCH) reception and acknowledgement / negative acknowledgement (ACK / NACK) transmission process is shown.

[0029] Figure 7 An exemplary physical uplink shared channel (PUSCH) transmission process is shown.

[0030] Figures 8 to 10 is a diagram illustrating DRX related operations.

[0031] Fig.11 and Fig.12 is a diagram illustrating a multi-DRX overlapping period related to monitoring adaptation according to an embodiment.

[0032] Fig.13 is a diagram illustrating monitoring adaptation in a multi-DRX environment according to an embodiment.

[0033] Fig.14 is a diagram illustrating signal reception of a UE according to an embodiment.

[0034] Fig.15 is a diagram illustrating signal transmission of a BS according to an embodiment.

[0035] Figures 16 to 19 An example of the communication system 1 and the wireless device applicable to the present disclosure is shown. DETAILED DESCRIPTION

[0036] 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 Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a 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.

[0037] As more and more communication devices require greater communication capacity, enhanced mobile broadband communications relative to traditional radio access technologies (RATs) are needed. In addition, large-scale machine-type communications (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 communications (eMBB), massive MTC, and ultra-reliable low-latency communications (URLLC). In the embodiments of the present disclosure, for simplicity, this technology will be referred to as NR (new radio or new RAT).

[0038] For the sake of brevity, 3GPP NR is mainly described, but the technical concept of the present disclosure is not limited thereto.

[0039] For background information, definitions of terms, and abbreviations related to the present disclosure, the following documents are incorporated by reference.

[0040] -3GPP TS 38.211: Physical channels and modulation

[0041] -3GPP TS 38.212: Multiplexing and channel coding

[0042] -3GPP TS 38.213: Physical layer procedures for control

[0043] -3GPP TS 38.214: Physical layer procedures for data

[0044] -3GPP TS 38.215: Physical layer measurements

[0045] -3GPP TS 38.300: NR and NG-RAN general description

[0046] -3GPP TS 38.304: User Equipment (UE) procedures in idle mode and RRC inactive state

[0047] -3GPP TS 38.321: Medium Access Control (MAC) Protocol

[0048] -3GPP TS 38.322: Radio Link Control (RLC) protocol

[0049] -3GPP TS 38.323: Packet Data Convergence Protocol (PDCP)

[0050] -3GPP TS 38.331: Radio Resource Control (RRC) protocol

[0051] -3GPP TS 37.324: Service Data Adaptation Protocol (SDAP)

[0052] -3GPP TS 37.340: Multi-connectivity; General description

[0053] -3GPP TS23.287: Application layer support for V2X services; functional architecture and information flow

[0054] -3GPP TS23.501: System architecture of 5G system

[0055] -3GPP TS23.502: 5G system procedures

[0056] -3GPP TS23.503: Policy and Charging Control Framework for 5G Systems; Stage 2

[0057] -3GPP TS24.501: Non-Access Stratum (NAS) Protocol for 5G System (5GS); Stage 3

[0058] -3GPP TS24.502: Access to the 3GPP 5G Core Network (5GCN) via non-3GPP access networks

[0059] -3GPP TS24.526: User Equipment (UE) Strategy for 5G System (5GS); Stage 3

[0060] Terms and abbreviations

[0061] -5GC: 5G core network

[0062] -5GS: 5G system

[0063] -AP: Access Point

[0064] -CID: Cell ID

[0065] -E-CID: Enhanced Cell ID

[0066] -PRS: Positioning Reference Signal

[0067] -RRM: Radio Resource Management

[0068] -TP: Transmit Point

[0069] -TRP: Transmit and Receive Point

[0070] -UE: User Equipment

[0071] -SSB: Synchronization Signal Block

[0072] -SFN: System frame number

[0073] -SS: Search Space

[0074] -CSS: Common Search Space

[0075] -USS: UE-specific search space

[0076] -PDCCH: Physical Downlink Control Channel

[0077] -PDSCH: Physical Downlink Shared Channel

[0078] -PUCCH: Physical Uplink Control Channel

[0079] -PUSCH: Physical Uplink Shared Channel

[0080] -DCI: Downlink Control Information

[0081] -UCI: Uplink Control Information

[0082] -SI: System Information

[0083] -SIB: System Information Block

[0084] -MIB: Master Information Block

[0085] -RRC: Radio Resource Control

[0086] -DRX: Discontinuous Reception

[0087] -RNTI: Radio Network Temporary Identifier

[0088] -CSI: Channel State Information

[0089] -PCell: Primary cell

[0090] -SCell: Secondary cell

[0091] -PSCell: Primary SCG (Secondary Cell Group) cell

[0092] -CA: Carrier Aggregation

[0093] -WUS: wake-up signal

[0094] -PO: Paging Occasion

[0095] -PEI: Paging Early Indication

[0096] -PEI-O: PEI timing

[0097] -NES: Network Energy Saving

[0098] -RO: RACH timing

[0099] -RAR: Random Access Response

[0100] -SDT: Small Data Transfer

[0101] In a wireless communication system, a user equipment (UE) receives information from a base station (BS) through a downlink (DL) and transmits information to the BS through 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 according to the type / purpose of the information transmitted and received by the UE and the BS.

[0102] Figure 1 Physical channels used in the 3GPP NR system and a general signal transmission method using the same are shown.

[0103] 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., establishes 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. The UE can receive a DL reference signal (RS) during the initial cell search process to monitor the DL channel status.

[0104] After the initial cell search, the UE may acquire more specific system information by receiving a physical downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) based on information of the PDCCH in step S102.

[0105] The UE may perform a random access procedure to access the BS in steps S103 to S106. For random access, the UE may send 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 perform a contention resolution procedure by further sending a PRACH (S105) and receiving a PDCCH and a PDSCH corresponding to the PDCCH (S106).

[0106] After the foregoing 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 confirmation / negative determination (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, UCI may be sent on PUSCH when control information and business data need to be sent simultaneously. In addition, UCI may be sent aperiodically via PUSCH according to the request / command of the network.

[0107] Figure 2 The radio frame structure is shown. In NR, uplink transmission and downlink transmission are configured in frames. Each radio frame has a length of 10ms and is divided into two 5ms half frames (HF). Each half frame is divided into five 1ms 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.

[0108] 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.

[0109] [Table 1]

[0110] <![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

[0111] *N slot symb : The number of symbols in a time slot

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

[0113] *N subframe,u slot : Number of time slots in a subframe

[0114] 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 the SCS when the extended CP is used.

[0115] [Table 2]

[0116] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot <!-- 5 -->]]> 60KHz(u=2) 12 40 4

[0117] 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.

[0118] In the NR system, OFDM parameter sets (e.g., SCS) 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) (referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently between aggregated cells. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0119] Figure 3 A 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 (e.g., 12 consecutive subcarriers) in the frequency domain. A bandwidth part (BWP) may 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 may include up to N (e.g., five) BWPs. Data communication may be performed via enabled BWPs, and only one BWP may be enabled for a UE. In a resource grid, each element is referred to as a resource element (RE), and a complex symbol may be mapped to each RE.

[0120] Figure 4An 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 a DL control region), and the last M symbols of a time slot can be used to carry a UL channel (e.g., PUCCH) (hereinafter referred to as a UL control region). Each of N and M is an integer equal to or greater than 0. The resource region (hereinafter referred to as the data region) between the DL control region and the UL control 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 when switching from DL to UL can be configured as GPs.

[0121] PDCCH transmits DCI. For example, PDCCH (i.e., DCI) may carry information about the transmission 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 high-level 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 used 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 a system information RNTI (SI-RNTI). When the PDCCH is for RAR, the CRC is masked by a random access-RNTI (RA-RNTI).

[0122] Figure 5 An exemplary PDCCH transmission / reception process is shown.

[0123] Reference Figure 5, the 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.). REG is defined as one OFDM symbol by one (physical) resource block (P)RB. Multiple CORESETs for one UE may overlap with each other in the time / frequency domain. The CORESET may be configured by system information (e.g., master information block (MIB)) or high-level signaling (e.g., radio resource control (RRC) signaling). For example, configuration information about 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 send a specific PDCCH. In addition, configuration information about CORESET#N (e.g., N>0) may be sent by 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 establishment message, RRC reconfiguration message and / or BWP configuration information. Specifically, CORESET configuration may include the following information / fields.

[0124] -controlResourceSetId: indicates the ID of the CORESET.

[0125] -frequencyDomainResources: Indicates the frequency domain resources of the CORESET. The resources are indicated by a bitmap corresponding to each bit and RB group (= 6 (contiguous) RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit with a bit value of 1 is allocated as the frequency domain resource of the CORESET.

[0126] -duration: Indicates the time domain resource of CORESET. It indicates the number of consecutive OFDM symbols included in CORESET. duration has a value between 1 and 3.

[0127] -cce-REG-MappingType: indicates the control channel element (CCE) to REG mapping type. Both interleaved and non-interleaved types are supported.

[0128] -interleaverSize: Indicates the interleaver size.

[0129] -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.

[0130] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0131] -reg-BundleSize: Indicates the REG bundle size.

[0132] -tci-PresentInDCI: indicates whether the transmission configuration index (TCI) field is included in the DL-related DCI.

[0133] -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).

[0134] In addition, the BS may send a PDCCH search space (SS) configuration to the UE (S504). The PDCCH SS configuration may be sent through high-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, in Figure 5 In the embodiment, the CORESET configuration and the PDCCH SS configuration are shown to be 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.

[0135] The PDCCH SS configuration may include information about 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 a "PDCCH SS".

[0136] The PDCCH SS set includes PDCCH candidates. PDCCH candidates are CCEs that the UE monitors to receive / detect PDCCH. Monitoring includes blind decoding (BD) of PDCCH candidates. 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.

[0137] -searchSpaceId: indicates the ID of the SS.

[0138] -controlResourceSetId: Indicates the CORESET associated with the SS.

[0139] - monitoringSlotPeriodicityAndOffset: indicates the periodicity (in time slots) and offset (in time slots) of PDCCH monitoring.

[0140] -monitoringSymbolsWithinSlot: Indicates the first OFDM symbol used for PDCCH monitoring in a slot configured with PDCCH monitoring. The first OFDM symbol used for PDCCH monitoring is indicated by a bitmap where each bit corresponds to an OFDM symbol in the slot. The MSB of the bitmap corresponds to the first OFDM symbol of the slot. The OFDM symbol corresponding to the bit set to 1 corresponds to the first symbol of the CORESET in the slot.

[0141] -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}.

[0142] -searchSpaceType: Indicates CSS or USS and the DCI format used in the corresponding SS type.

[0143] Subsequently, the BS may generate a PDCCH and send the PDCCH to the UE (S506), and the UE may monitor the PDCCH candidates in one or more SSs to receive / detect the PDCCH (S508). The timing (e.g., time / frequency resources) at which the UE is to monitor the PDCCH candidates is defined as a PDCCH (monitoring) timing. One or more PDCCH (monitoring) timings may be configured in a time slot.

[0144] Table 3 shows the characteristics of each SS.

[0145] [Table 3]

[0146]

[0147] Table 4 shows the DCI format transmitted on the PDCCH.

[0148] [Table 4]

[0149]

[0150] DCI format 0_0 can be used to schedule TB-based (or TB-level) PUSCH, and 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, and 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 format 0_0 / 0_1 can be called UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 can be called 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 the UE, and DCI format 2_1 is used to transmit DL preemption information to the UE. DCI format 2_0 and / or DCI format 2_1 can be transmitted to a corresponding group of UEs on a group common PDCCH (a PDCCH pointing to a group of UEs).

[0151] 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. Under the fallback DCI format, the DCI size / field configuration remains the same regardless of the UE configuration. In contrast, under the non-fallback DCI format, the DCI size / field configuration varies according to the UE configuration.

[0152] 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.

[0153] - 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.

[0154] - 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 one REG bundle, and the REG bundles are interleaved within a CORESET. In a CORESET that includes one or two OFDM symbols, a REG bundle includes 2 or 6 REGs, and in a CORESET that includes three OFDM symbols, a REG bundle includes 3 or 6 REGs. The REG bundle size is set based on the CORESET.

[0155] Figure 6 An exemplary PDSCH reception and ACK / NACK transmission process is shown. Figure 6 , the UE may detect the PDCCH in 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.

[0156] - Frequency domain resource assignment: indicates the RB set allocated to PDSCH.

[0157] - 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, number of OFDM symbols).

[0158] -PDSCH-to-HARQ_feedback timing indicator: indicates K1.

[0159] -HARQ process number (4 bits): indicates the HARQ process ID of the data (eg, PDSCH or TB).

[0160] - PUCCH resource indicator (PRI): indicates a PUCCH resource to be used for UCI transmission among multiple PUCCH resources in a PUCCH resource set.

[0161] 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 a 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.

[0162] In the case where the PDSCH is configured to carry up to one TB, the HARQ-ACK response may be configured in one bit. In the case where the PDSCH is configured to carry up to two TBs, the HARQ-ACK response may be configured in 2 bits if spatial bundling is not configured, and in 1 bit if spatial bundling is configured. When slot #(n+K1) is designated as the HARQ-ACK transmission timing of multiple PDSCHs, the UCI sent in slot #(n+K1) includes the HARQ-ACK responses for multiple PDSCHs.

[0163] Whether the UE should perform spatial bundling for HARQ-ACK responses may be configured for each cell group (e.g., via RRC / high-layer signaling). For example, spatial bundling may be configured for each individual HARQ-ACK response sent on the PUCCH and / or a HARQ-ACK response sent on the PUSCH.

[0164] Spatial bundling can be supported when up to two (or two or more) TBs (or codewords) can be received at a time (can be or be scheduled by one DCI) in the corresponding serving cell (for example, when the high-level parameter maxNrofCodeWordsScheduledByDCI indicates 2 TBs). 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 where more than four layers can be scheduled. A UE that wants to send a HARQ-ACK response through spatial bundling can generate a HARQ-ACK response by performing a (bit-by-bit) logical AND operation on the A / N bits of multiple TBs.

[0165] For example, assuming that a UE receives a DCI that schedules two TBs and receives the two TBs on a PDSCH based on the DCI, the UE that performs spatial bundling can generate a single A / N bit by a logical AND operation between a first A / N bit of a first TB and a second A / N bit of a 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.

[0166] 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.

[0167] There are multiple parallel DL HARQ processes at the BS / UE for DL ​​transmission. Multiple parallel HARQ processes allow continuous DL transmission while the BS waits for 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 the MAC PDUs in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0168] Figure 7 An exemplary PUSCH transmission process is shown. Figure 7 , the UE may detect the PDCCH in slot #n. The PDCCH includes DL scheduling information (eg, DCI format 1_0 or 1_1). The DCI format 1_0 or 1_1 may include the following information.

[0169] - Frequency domain resource assignment: indicates the RB set assigned to PUSCH.

[0170] -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 may be indicated by a start and length indicator value (SLIV) or separately.

[0171] Then, the UE may transmit the PUSCH in slot #(n+K2) according to the scheduling information in slot #n. The PUSCH includes the UL-SCH TB.

[0172] DRX (Discontinuous Reception)

[0173] (1)RRC_CONNECTEDDRX

[0174] Figure 8 is a diagram illustrating a DRX operation of a UE.

[0175] The UE may perform DRX operation in the process and / or method described / proposed above. A UE configured with DRX may reduce power consumption by discontinuously receiving DL 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.

[0176] 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, the UE starts the inactivity timer and remains awake. On the contrary, when the UE fails to detect any PDCCH during the PDCCH monitoring, 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 process and / or method 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. On the contrary, 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.

[0177] Table 5 describes the DRX operation of the UE (in the RRC_CONNECTED state). Referring to Table 5, DRX configuration information is received through high-layer signaling (e.g., RRC signaling), and DRX on / off is controlled by a DRX command from the MAC layer. Once DRX is configured, the UE may perform PDCCH monitoring discontinuously while executing the above-described / proposed procedures and / or methods.

[0178] [Table 5]

[0179]

[0180] 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. - Value of drx-OnDurationTimer: defines the duration of the start period of the DRX cycle.

[0181] - 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.

[0182] - Value of drx-HARQ-RTT-TimerDL: defines the duration of the maximum time period after receiving a DL initial transmission until a DL retransmission is received.

[0183] - Value of drx-HARQ-RTT-TimerDL: defines the duration of the maximum time period after receiving a UL initial transmission grant until receiving a UL retransmission grant.

[0184] -drx-LongCycleStartOffset: defines the duration and start time of the DRX cycle.

[0185] -drx-ShortCycle (optional): defines the duration of the short DRX cycle.

[0186] 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.

[0187] (2)RRC_IDLEDRX

[0188] 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.

[0189] 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.

[0190] Fig. 9 An exemplary DRX cycle for paging is shown.

[0191] Reference Fig. 9 , DRX may be configured for discontinuous reception of paging signals. The UE may receive DRX configuration information from the BS through high-layer (e.g., RRC) signaling. The DRX configuration information may include configuration information related to a DRX cycle, a DRX offset, a DRX timer, etc. The UE repeats the on-duration and the sleep-duration according to the DRX cycle. The UE may operate in the awake mode during the on-duration and in the sleep mode during the sleep-duration.

[0192] In wake-up mode, the UE may monitor PO to receive a paging message. PO means the time resource / interval (e.g., subframe or time slot) at which the UE expects to receive a paging message. PO monitoring includes monitoring a PDCCH (MPDCCH or NPDCCH) scrambled with a P-RNTI on a PO (hereinafter referred to as a paging PDCCH). A paging message may be included in a paging PDCCH or a PDSCH scheduled by a paging PDCCH. One or more POs may be included in a paging frame (PF), and the PF may be periodically configured based on a UE ID. A PF may correspond to a radio frame, and the UE ID may be determined based on an International Mobile Subscriber Identity (IMSI) of the UE. 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 a PO, the UE may perform a RACH process to initialize (or reconfigure) a connection with the BS, or receive (or obtain) new system information from the BS. Therefore, in the above-described process and / or method, PO monitoring may be performed discontinuously in the time domain to perform a RACH process for connecting to the BS, or to receive (or obtain) new system information from the BS.

[0193] Fig.10 An extended DRX (eDRX) cycle is shown.

[0194] 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 a 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 a paging signal. Fig. 9 One 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.

[0195] Multi-DRX monitoring adaptation

[0196] To support XR services (FS_NR_XR_enh), various scenarios and candidate technologies have recently been discussed in the Rel-18 NR standard. XR services typically require high data rates and low latency, and various power saving techniques are considered because the UE is expected to consume a lot of power. The business model and requirements for XR services are defined in the technical report TR38.838 of Rel-17 XR research. XR services typically require 60fps (frames per second), sometimes 120fps. The frames in the XR business model can be understood as the same as the packets received in the communication environment. In order to handle this periodic transmission and achieve power saving, DRX operation and monitoring adaptive operation can be considered for UEs supporting XR services.

[0197] The DRX operation of the UE will be briefly described. The DRX in NR for reducing unnecessary power consumption of the UE has the following characteristics. The DRX structure of the UE in the RRC_IDLE state and the DRX structure of the UE in the RRC_CONNECTED state are defined separately, and the two DRX structures are designed so that the time period during which the UE can expect to receive the DL signal is defined to occur periodically, and unnecessary power consumption is reduced in other time periods. In particular, in C-DRX (i.e., DRX applied to the UE in the RRC_CONNECTED state), the start position of the on-duration period occurs periodically based on the Rel-16 standard of NR, and the length of the configurable cycle (i.e., the DRX cycle) can be determined by the high-level parameters provided by the BS to the UE.

[0198] Monitoring adaptation operation refers to the operation of adjusting (usually reducing) the number of monitoring operations that the UE should perform. The UE can be configured with up to 10 SS sets in each BWP and monitor the PDCCH candidates included in the SS sets. Since the UE should perform blind decoding (BD) for PDCCHs whose reception time and DCI format are unknown, PDCCH monitoring accounts for a large part of the power consumption. Monitoring adaptation refers to PDCCH monitoring skipping (hereinafter, skipping) and SS set group (SSSG) switching (hereinafter, switching). Skipping is defined as the operation of stopping PDCCH monitoring for a specified duration, and switching is defined as the operation of stopping monitoring the SS sets included in the current specific SSSG and starting monitoring the SS sets included in another SSSG.

[0199] For XR services, multiple streams such as audio and video can be considered in addition to a single stream. In this case, the multiple streams may differ in properties such as periodicity and size, and to support this, multiple DRXs may be configured for the UE. In multiple DRX configurations, each DRX may have a different cycle and a different drx-onDurationTimer length.

[0200] For a UE configured with multiple DRXs, the active times of the multiple DRXs may overlap with each other. In this case, monitoring adaptation may be indicated for the DRXs individually or collectively. In other words, common or independent monitoring adaptation may be configured / indicated for multiple DRX active times. Therefore, monitoring adaptation may be effectively configured / indicated for a UE configured with multiple DRXs.

[0201] A method is proposed below for indicating monitoring adaptation to a UE configured with multiple DRXs and operating the UE accordingly.

[0202] For example, a UE may be configured with multiple DRXs to support a specific service (e.g., an XR service). In this case, each DRX may have a different cycle or different length and operation of a timer defining an active time. Therefore, each DRX may operate independently, and as a result, multiple DRX active times may overlap in a specific period. Since the monitoring adaptation operation is indicated / performed based on the DRX active time, it may not be clear which DRX is monitored for the adaptive indication / operation in the period overlapping between multiple DRX active times.

[0203] To solve this problem, a method for configuring common or independent monitoring adaptation for UEs configured with multiple DRXs is proposed. UE operations can be performed jointly or independently according to one indication during a period in which multiple DRX activity times overlap.

[0204] A method for identifying the DRX targeted by the monitoring adaptation indication when monitoring adaptation is configured / performed independently for each DRX is proposed. In an environment where multiple DRXs are configured, the UE can identify the DRX targeted by the indicated monitoring adaptation and perform the indicated operation accordingly.

[0205] The XR service used as an example below is an applicable example, so the application of the proposed method is not limited to the XR service. For example, it can be extended to all signals received by the UE with a specific periodicity. The proposed method is applicable to all types of transmission and reception methods expected by the BS and the UE. Although the following description is given in the context of the NR system as an example, it is obvious that the proposed method is applicable to all wireless communication transmission and reception structures and services.

[0206] For the sake of clarity, in the following description, methods or options are distinguished, which should not be interpreted as meaning that each should be implemented as an independent invention. For example, although the methods / options described below can be implemented separately, at least some of them can be implemented in combination unless mutually contradictory.

[0207] [Method 1] Common monitoring adaptive operation of multiple DRX

[0208] When multiple DRX active times are configured for a UE, monitoring adaptation may be configured / indicated for multiple DRXs together.Although the corresponding methods are described in the context of indication / operation based on a scheduled DCI, these methods may also be applied to non-scheduled DCI.

[0209] [Method 1-1] Common monitoring adaptive configuration of multiple DRX

[0210] According to the Rel-17 standard, a UE may be configured with up to three search space set (SS set) groups and / or three skip durations for each BWP.

[0211] According to an embodiment, the SS set group / skip duration configured for each BWP may be commonly applied to multiple DRXs. Therefore, multiple DRXs may be distinguished by cycles and DRX timers. For example, a DRX configured to receive DL video and audio may be distinguished by cycles and drx-onDurationTimer and drx-inactivityTimer.

[0212] [Method 1-2] Common monitoring adaptive indication and operation of overlapping periods between multiple DRX

[0213] In the case where SS set grouping / skipping duration is configured jointly for multiple DRXs, when the UE receives a monitoring adaptation indication for a period of overlap of multiple DRXs, the UE may perform a common monitoring adaptation operation in the multiple DRXs. For example, when DRX0 and DRX1 are configured for the UE and they have different cycles and timers, DRX0 and DRX1 may overlap only in a specific time period. When the UE receives a monitoring adaptation indication for the overlapping period, the UE may perform the indicated monitoring adaptation operation in both DRX0 and DRX1. When monitoring skipping is indicated, the UE may stop all PDCCH monitoring operations in DRX0 and DRX1 during the skipping duration. When SSSG switching is indicated, the UE switches the SSSG monitored in DRX0 and DRX1.

[0214] According to an embodiment, a period in which a plurality of DRXs overlap with each other may be defined as follows.

[0215] 1) Union of drx-onDurationTimer

[0216] The corresponding period may be defined / interpreted as the union of drx-onDurationTimer.

[0217] For example, refer to Fig.11In (a), the on - duration timer 1101 in DRX0 (of the first DRX cycle) starts in time slot A1 and ends in time slot A2, and the on - duration timer 1102 in DRX1 (of the first DRX cycle) starts in time slot B1 and ends in time slot B2, satisfying the relationship A1 < B1 < A2 < B2. The time period 1101 from time slot A1 to time slot B2 can be defined as a period where multiple DRXs overlap.

[0218] As an additional example, time gaps equal to or less than a specific duration T can be further considered. Even if there are time gaps equal to or less than a specific value between multiple drx - onDurationTimers, they are defined as periods where the corresponding DRXs overlap, and the overlapping period can be defined as the union of the drx - onDurationTimers. For example, referring to Fig.11 In (b), the gap between the expiration of the on - duration timer 1103 of the second DRX cycle in DRX0 and the start of the on - duration timer 1104 of the second DRX cycle in DRX1 is gap 1, and since gap 1 exceeds the duration T, it is not included in the overlapping period. However, the gap between the expiration of the on - duration timer 1104 of the second DRX cycle in DRX1 and the start of the on - duration timer 1105 of the third DRX cycle in DRX0 is gap 2, and since gap 2 is less than or equal to the duration T, it is included in the overlapping period. Therefore, according to Fig.11 the method in (b), the time period 1120 (not only the time period 1101) can be defined as a period where multiple DRXs overlap.

[0219] Fig.11 The advantage of the method in (b) is that when multiple drx - onDurationTimers are positioned at small gaps (e.g., 1 time slot) from each other, the indicated monitoring adaptation (e.g., skipping) does not terminate at the end of each DRX, but is carried out in the next DRX regardless of the gap, thus improving the power - saving effect.

[0220] For the termination of the skip operation at the end of DRX, refer to Table 6 below.

[0221] 2) Union of DRX active times

[0222] The corresponding period can be defined / interpreted as the union of DRX active times. According to the standard document TS38.321, the DRX active times are defined as shown in Table 6 below.

[0223] [Table 6]

[0224]

[0225] In short, while at least one of the DRX on-duration timer, DRX inactivity timer, or DRX retransmission timer is running, it can be referred to as the DRX active time. Except for the on-duration timer started according to the DRX cycle, the inactivity timer for new transmissions and the retransmission timer for retransmissions are timers newly started due to PDCCH reception, which results in an extension of the DRX active time.

[0226] Therefore, the periods during which multiple DRXs overlap can be represented as the union of the DRX active times defined based on Table 6 above. In addition, even if there is a time gap equal to or less than a specific value between the DRX active time or DRX timers as in Method 1) above, the periods during which multiple DRXs overlap can still be defined.

[0227] 3) Intersection of drx-onDurationTimer

[0228] The periods during which multiple DRXs overlap can be defined / interpreted as the intersection of drx-onDurationTimer.

[0229] For example, referring to Fig.12 , when the on-duration timer 1201 in DRX0 (of the first DRX cycle) starts from time slot A1 and ends in time slot A2, and the on-duration timer 1202 in DRX1 (of the first DRX cycle) starts from time slot B1 and ends in time slot B2, and the relationship A1 < B1 < A2 < B2 is satisfied, the period 1210 from time slot B1 to time slot A2 can be defined as the period during which multiple DRXs overlap.

[0230] 4) Intersection of DRX active time

[0231] The periods during which multiple DRXs overlap can be represented as the intersection of the DRX active times defined according to Table 6 above.

[0232] For this operation, the UE may need to align the monitoring operations performed in multiple DRXs. In other words, when the on-duration of DRX1 starts during PDCCH monitoring in SSSG0 of DRX0, so that the two DRXs overlap, the UE may have to perform PDCCH monitoring in SSSG0 during the overlapping period without receiving any separate indication. Therefore, for the DRX that starts later in time (e.g., DRX1) in the time slot where multiple DRXs start to overlap, the UE may still have to perform PDCCH monitoring for the DRX that starts earlier (e.g., DRX0). When multiple DRXs start simultaneously (e.g., in the same time slot), the operations to be performed at the start may have to be aligned and configured jointly for multiple DRXs.

[0233] Even when multiple DRXs are configured, a UE following this operation may not operate in a significantly different manner than a single DRX in terms of PDCCH monitoring and monitoring adaptation indication. Although the PDCCH monitoring period and its periodicity are a bit more complicated than in a single DRX depending on the configuration of each DRX, it can be the same as the monitoring adaptation indicated for the entire PDCCH monitoring execution of the UE.

[0234] When this operation is followed, the existing standards in Rel-17 regarding DRX configuration and monitoring adaptation operations can be applied without changing. As described above, the number of SS set groups and skip durations that can be configured for a single BWP is determined, and a common configuration of multiple DRXs according to the number can be enabled in the current standard. In addition, it does not violate the operation of immediately terminating the indicated skip when the indicated skip is outside the DRX active time agreed in RAN1#110 (see Table 7 below).

[0235] [Table 7]

[0236]

[0237] Even if the indicated skip duration exceeds the remaining active time of one DRX, the skip operation is still performed jointly for multiple DRXs, and it is still the DRX active time for other DRXs, so the same skip operation can be performed continuously. When the indicated skip duration exceeds the remaining active time of one DRX (e.g., DRX0), an operation of immediately terminating the DRX (e.g., DRX0) can be defined. This may only be associated with the DRX timer and is used for the purpose of early termination of the DRX timer that does not necessarily need to be maintained. Even if this is performed, the UE's PDCCH monitoring may not change.

[0238] [Method 1-3] Individual monitoring adaptive indication and operation of overlapping periods between multiple DRX

[0239] Unlike method 1-2, even if the SS set group and skip duration are configured for multiple DRXs together, monitoring adaptation can be indicated and performed separately for each DRX. For example, two DRXs, DRX0 and DRX1, can be configured for the UE, and due to their different cycles and timers, they overlap only in a specific period. When the UE receives the monitoring adaptation indication for the overlapping period, the UE can perform the indicated operations for DRX0 and DRX1 separately. When skip is indicated for DRX0, the UE stops PDCCH monitoring in DRX0 during the skip duration. When SSSG switching is indicated for DRX0, the SSSG is switched in DRX0.

[0240] Compared with method 1-2, the monitoring operations performed by the UE for multiple DRXs in method 1-3 may not be aligned. Since the UE should be able to receive different monitoring adaptation indications for each DRX and perform operations, the UE does not need to align the operations. However, in order to save power, it may be considered to align the PDCCH monitoring operations until the first monitoring adaptation indication is received in the period where multiple DRXs overlap. In other words, when the on-duration of DRX1 starts during the PDCCH monitoring in SSSG0 of DRX0, the UE may have to perform PDCCH monitoring for SSSG0 in the corresponding period when the two DRXs overlap without receiving any separate indication. Therefore, the UE may have to perform PDCCH monitoring of the previously started DRX (e.g., DRX0) in the DRX (e.g., DRX1) that starts later in time in the time slot where multiple DRXs start overlapping. When multiple DRXs start at the same time (e.g., in the same time slot), it may be necessary to align and configure the operations to be performed at the start for multiple DRXs together. Then, when monitoring adaptation is indicated for each individual DRX, the operation may be performed accordingly.

[0241] The operations defined in methods 1-3 can also be used to save power. In the case of a skip indication for a specific DRX, PDCCH monitoring is completely stopped in the specific DRX, while PDCCH monitoring is still performed in other DRXs. As a result, the effect of reducing the number of SS sets monitored by the UE is achieved. Therefore, the UE can save power.

[0242] When SSSG switching is indicated for a specific DRX, additional configuration may be required separately. When the SS sets included in the commonly configured SSSG0 and SSSG1 are exclusively configured so that the number of SS sets belonging to the two SSSGs is minimized, indicating different SSSGs to be monitored in each DRX may be disadvantageous in terms of power consumption. When SSSG0 is monitored in DRX0 and SSSG1 is monitored in DRX1, it may be the same as monitoring all SS sets configurable in the BWP on the UE side, and the UE may consume less power before receiving the switching indication. Therefore, in this case, when the SS set belonging to the SSSG for power saving (e.g., SSSG1) is also configured to belong to the SSSG for data reception (e.g., SSSG0), power can be saved even if different SSSGs are monitored in each DRX. In addition, as described above, it may be advantageous to start PDCCH monitoring in a newly started DRX in alignment with the monitoring operation in the already running DRX so that they overlap in terms of power consumption.

[0243] Alternatively, PDCCH monitoring may be performed according to a preset rule in a time slot overlapping from the start of DRX until a new monitoring adaptation is received. For example, when an overlapping period between multiple DRXs begins, a pre-configured SSG may be monitored in multiple DRXs instead of following the previously run DRX. Therefore, as PDCCH monitoring is aligned according to a preset rule in a time slot overlapping from the start of DRX until a new monitoring adaptation is received, a power saving effect may be achieved.

[0244] Alternatively, the DRX to be followed in operation may be determined by prioritizing DRXs or presetting a specific DRX, rather than following the PDCCH monitoring operation of an already running DRX. For example, when DRX0 has a higher priority than DRX1 or the PDCCH monitoring operation to follow DRX0 is preset, even if DRX0 starts while the UE is operating in DRX1, it may be aligned with the operation of DRX0. Therefore, when determining the priority of each DRX, the preset priority of each DRX may be applied in the rule (i.e., BD / CCE discard rule) for calculating the maximum number of PDCCH candidates and the number of non-overlapping CCEs to be monitored by the UE in each time slot (or span). For example, when SSSG0 is monitored in DRX0 with a high priority, SSSG1 is monitored in DRX1, SS set index 4 belongs only to SSSG0, and SS set index 3 belongs only to SSSG1, the UE first calculates the number of PDCCHs monitored in SS set index 3 and then calculates the number of PDCCHs monitored in SS set index 4 according to the current standard BD / CCE discard rule. However, since the priority of each DRX is applied, calculation is first performed for SS set index 4 of SSSG0 belonging to DRX0, all other SS sets belonging to SSSG0, and then for SS set index 3 of SSSG1 belonging to DRX1.

[0245] In the operation proposed in method 1-3, the period of multiple DRX overlap may be defined differently. In method 1-2, the period of multiple DRX overlap is defined based on the DRX active time, but this may be limited to a specific timer. For example, the period of multiple DRX overlap may be defined as the period in which the on-duration timer (and inactivity timer) of the DRX overlaps.

[0246] When a separate monitoring adaptation indication and operation is defined for the entire DRX active time, this may take into account the complexity of the UE operation and unnecessary definition in periods where the corresponding operation may not be required.

[0247] When the cycle of a specific DRX is short, the corresponding operation may not be applied to the DRX even if it is defined for the UE. When the cycle of the DRX is short, the active time can be repeated in a shorter time slot gap, so the corresponding operation may not need to be applied to all periods overlapping with other DRXs. For example, when a small service is periodically sent in a very short cycle of a specific DRX, the period overlapping with another DRX may occur frequently, and applying the corresponding operation every time the overlapping period occurs may be wasteful.

[0248] For the method of identifying the DRX for which the indication is directed, the operations proposed in the following method 2-2 may be applied in the same manner.

[0249] [Method 1-4] Different monitoring adaptive indication and operation between overlapping periods and non-overlapping periods between multiple DRX

[0250] As in method 1-1, the common monitoring adaptation of multiple DRXs may be configured differently for overlapping periods and non-overlapping periods between multiple DRXs. In other words, the SSSG and skip duration that may be configured for each BWP may be configured separately for overlapping periods and non-overlapping periods. The UE may receive the SSSG and skip duration information and perform operations separately for overlapping periods and non-overlapping periods. This may be configured / indicated to the UE via high-layer signaling (e.g., dedicated RRC). As described above, whether multiple DRXs overlap may be determined based on the DRX activity time (or drx-onDurationTimer).

[0251] For example, when the UE receives the monitoring adaptation indication, the UE may identify whether it is for an overlapping period or a non-overlapping period. When a skip indication (skipping the second duration of the configured skip duration) is received, when the indication is for an overlapping period, the UE may skip the second duration configured for the overlapping period. When the indication is for a non-overlapping period, the UE may skip the second duration configured for the non-overlapping period.

[0252] In addition, when the UE receives an SSSG switching indication (switch to SSSG1) and the indication is for an overlapping period, the UE may switch to SSSG1 configured for the overlapping period. When the indication is for a non-overlapping period, the UE may switch to SSSG1 configured for the non-overlapping period.

[0253] [Method 2] Multiple DRX individual monitoring and adaptive operation

[0254] When multiple DRX active times are configured for a UE, monitoring adaptation may be configured / indicated independently for the multiple DRXs.Although the corresponding methods are described in the context of indication / operation based on scheduled DCI, these methods may also be applied to non-scheduled DCI.

[0255] [Method 2-1] Separate monitoring and adaptive configuration of multiple DRX

[0256] Up to three SS set groups or three skip durations may be configured separately for each of the multiple DRXs. Therefore, up to three SS set groups or three skip durations may be configured for each DRX, and the maximum number of allowed SS set groups or skip durations per BWP for the UE may exceed 3. The configurable SS set groups or skip durations may be determined from the same candidates as in the current standard.

[0257] The skip duration of each DRX can be configured according to the cycle and timer configured by the DRX. A DRX with a short cycle and a small timer length can be configured with a short skip duration, and a DRX with a large cycle and a large timer length can be configured with a long skip duration.

[0258] Considering the purpose of DRX, the SSSG of each DRX can be configured in a similar manner to configuring the skip duration. For example, it can be considered to include a SS set with short periodicity and a frequent monitoring opportunity for heavy traffic reception for DL ​​video in the SSSG of the DRX for the same purpose. When up to three SSSGs can be configured separately for each DRX, the complexity of UE operation may be too high when the UE must consider switching too many SSSGs within the BWP. To prevent this, a method of limiting the number of SSSGs to a specific level or below can be considered. For example, up to two SSSGs (for data reception and for power saving) can be configured for one DRX. Alternatively, SSSGs can be configured overlappingly for each DRX so that only up to three SSSGs are configured per BWP. For example, when the UE is configured with two DRXs (DRX0 and DRX1), SSSG0 can be configured for data reception in DRX0, SSSG1 can be configured for data reception in DRX1, and SSSG2 can be configured for public power saving. In this way, (some) different SSSGs can be configured for each DRX while maintaining the configuration of up to three SSSGs.

[0259] A UE following this behavior can be regarded as operating each DRX independently within a BWP. It can be said that for each independent DRX, PDCCH monitoring is performed and monitoring adaptation indication is received and performed, and some DRXs are linked to each other according to configuration.

[0260] [Method 2-2] Individual monitoring and adaptive indication of each DRX

[0261] A method for specifying monitoring adaptation separately for multiple DRXs is proposed. The method for identifying the DRX for which monitoring adaptation is indicated to the UE may be as follows. The following method may be predetermined or may be configured / indicated by a higher layer parameter. In method 2-2, UE operation when DCI is received in a timeslot within an overlapping period is proposed.

[0262] 1) DCI field

[0263] A field for identifying DRX may be added to the DCI. A monitoring adaptation indication field is included in the DCI to control PDCCH monitoring of a UE operating in DRX. When multiple DRXs are configured for a UE, a field for identifying DRX may be added to the DCI including the corresponding field. Alternatively, a bit identifying the DRX for which the indication is directed may be added to the current monitoring adaptation indication field.

[0264] 2) DCI format

[0265] DRX may be identified by a DCI format. When monitoring adaptation is indicated by a specific DCI format, monitoring adaptation may be preconfigured for the specific DRX indication. For example, DCI format x_1 may indicate monitoring adaptation of DRX0, and DCI format x_2 may indicate monitoring adaptation of DRX1.

[0266] 3) DCI size

[0267] DRX can be identified by DCI size. When the DCI that can be indicated to the UE is scrambled with C_RNTI by size alignment, three sizes are available for DCI. Therefore, DCI with different sizes can indicate monitoring adaptation of different DRXs. For example, k-bit DCI format x_1 can indicate monitoring adaptation of DRX0, and (k+a)-bit DCI format x_1 can indicate monitoring adaptation of DRX1.

[0268] 4) SS Set (and / or CORESET)

[0269] DRX can be identified by the SS set (and / or CORESET) in which the DCI is received. The UE can be configured with up to 10 SS sets (and up to 4 CORESETs) per BWP and receive DCI through the SS sets. Therefore, when the UE receives DCI in a specific SS set, monitoring adaptation can be indicated for DRX0, and when the UE receives DCI in other specific SS sets, monitoring adaptation can be indicated for DRX1. The specific SS set can be configured in the form of SSSG. For example, in the case where SSSG0 and SSSG2 are configured for DRX0 and SSSG1 and SSSG2 are configured for DRX1 as in the example of method 2-1, when the UE receives DCI in the SS set belonging to SSSG0, the UE can receive an indication of DRX0, and when the UE receives DCI in the SS set belonging to SSSG1, the UE can receive an indication of DRX1. In order to clearly identify the DRX for which the indication is directed, the UE may not expect to receive DCI including monitoring adaptation indications in SS sets belonging to two SSSGs in overlapping periods.

[0270] Similarly, DRX can be identified by CORESET. The UE can identify the DRX for which the indication is directed based on the linked CORESET of the SS set of the received DCI.

[0271] 5) Different interpretations of multiple DRX overlapping periods

[0272] When a time slot carrying a DCI including a monitoring adaptation indication field of up to 2 bits according to the current standard is within a period of overlap of multiple DRXs, the UE may interpret the field differently. For example, unlike the conventional method, the MSB of the existing 2-bit field may be used to identify the DRX, and the LSB of the field may indicate the SSSG to be switched or one of the two skip durations. The operation indicated by the LSB may be predetermined or may be configured / indicated by higher layer signaling. In another example, the MSB may identify the DRX, and when the LSB is 0, it may indicate skipping a predetermined duration, and when the LSB is 1, it may indicate switching between an SSSG for data reception and an SSSG for power saving (similar to switching).

[0273] 6) Indication based on DRX priority

[0274] As described above, the DRX may be prioritized or the DRX indicated in the overlapping period may be predetermined. In this case, it may be preconfigured between the UE and the BS that the monitoring adaptation of the overlapping period indication is always for a specific DRX, and operations may be performed accordingly.

[0275] [Method 2-3] UE operation based on the time point of applying SSSG switching after applying delay

[0276] Unlike method 2-2, UE operation based on the time point of monitoring adaptation indicated by the actual application is proposed. In the case of SSSG switching, non-zero application delay (the delay from the reception time of the DCI indicating the operation to the time when the actual UE operation is performed) appears significantly as multiple time slots. Therefore, the UE operation can be defined based on the time slot in which the SSSG switching operation is performed after the application delay from the time slot in which the DCI is received. In the case of PDCCH skipping, since the application delay is zero, the UE operation based on the actual operation time and the UE operation based on the DCI reception time can be the same.

[0277] In the case where the UE receives a DCI including an SSSG switching indication in time slot A and performs an SSSG switching operation in time slot B, when two DRXs are configured, three cases can be considered in time slot B: DRX0, DRX1, and overlap. Therefore, three pairs of SSSGs (for data reception and for power saving) can be configured. Therefore, the UE can apply the indication received in time slot A according to the DRX state of time slot B. When only DRX0 is operated, the corresponding configured SSSG switching can be performed, and when two DRXs are overlapped, the corresponding configured SSSG switching can be performed.

[0278] Alternatively, two pairs of SSSGs may be considered by distinguishing between a case where only one DRX operates and a case where DRXs overlap each other.

[0279] Typically, the BS can predict the DRX state of time slot B in time slot A and send an indication accordingly. However, when the overlapping period is configured based on the entire DRX active time, the DRX timer may be extended, so the exact DRX operation state of time slot B may be unknown. Since there is no case of early DRX termination, only the change from the expectation of only one DRX operation to the case of overlap between two DRXs can be considered. Therefore, when the SSSG configuration and indication in the overlapping period take this into account, there may be no problem in defining the operation.

[0280] [Method 2-4] UE operation in overlapping periods between multiple DRXs

[0281] In the case where SSSG and skip duration are configured separately for each DRX (method 2-1) and its monitoring adaptation is separately instructed (method 2-2), UE operation in the overlapping period between multiple DRXs is proposed. The definition of the overlapping period between multiple DRXs can follow the proposal in method 1-2.

[0282] In the case of a skip operation in a period where multiple DRXs overlap, even if the skip duration is configured separately, the operation can be performed by receiving common skip information of multiple DRXs in the overlapping period. Skipping is performed based on each DRX according to the PDCCH monitoring adaptive indication field. For example, when the field in the received DCI is 01, the PDCCH skip operation is performed in the first duration configured in each DRX.

[0283] In the case of operation only for each DRX, the corresponding indication can be distinguished according to method 2-2. Since PDCCH monitoring is stopped in the SSSG corresponding to the DRX in the case of different SSSG configurations for each DRX, skipping only in a specific DRX among multiple DRXs can be expected to have a power saving effect similar to SSSG switching. In addition, the skip indication for a specific DRX (for example, DRX1) can be an indication from a BS that does not need to monitor the service in DRX (DRX1).

[0284] Even if SSSG is configured separately, switching operation can be performed in the overlapping period of multiple DRXs by receiving common indication information of multiple DRXs in the overlapping period. Switching is performed based on each DRX according to the PDCCH monitoring adaptive indication field. For example, when the field in the received DCI is 01, switching is performed to SSSG0 configured in each DRX.

[0285] In the case of operations only for each DRX, the corresponding indication may be distinguished according to method 2-2. Considering the expected power saving effect of switching from SSSG in the case of different SSSG configurations for each DRX, it may be necessary to configure / indicate switching only in a specific DRX among multiple DRXs. For example, when monitoring an SSSG configured so that there is no SSG intersection between multiple DRXs, it may cause increased power consumption, so a configuration / indication to prevent this may be required.

[0286] The BS may pre-configure or pre-indicate how the UE will operate based on various monitoring adaptation indications.

[0287] When different monitoring adaptation indications are received at the same time (e.g., in the same time slot), it may be determined which indication is prioritized. When repeated indications for the same DRX are received at the same time, the earlier indication (indication in the earlier symbol) is executed, and the subsequent indication is not expected. In other words, the UE may not execute the subsequent indication.

[0288] When the indication is for different DRXs, it can be performed separately for each DRX even if they are received at the same time.

[0289] [Method 3] Monitoring adaptive indication in multi-cell environment

[0290] When the UE receives data from multiple cells, it can indicate the DRX for different cells. In other words, it can indicate that the DRX for which the adaptive indication is intended is monitored regardless of the scheduled cell. Although the method is described in the context of indication / operation based on scheduled DCI, it can also be applied to non-scheduled DCI.

[0291] Multiple DRXs may be configured for each cell as in the above method. Therefore, multiple DRXs or monitoring adaptation of a specific DRX may be indicated for different cells. For example, a DCI may be received in a scheduling cell (i.e., cell 1), and monitoring adaptation of DRX may be indicated in a scheduled cell (i.e., cell 2). In addition, a monitoring adaptation indication for cell 2 and a monitoring adaptation indication for cell 1 may be included in the same DCI. In other words, monitoring adaptation of DRXs of different cells may be indicated separately by one DCI.

[0292] In the proposed method, cells may be differentiated similarly to the differentiation of DRX in method 2-2. A method of differentiating cells similar to the differentiation of DRX proposed in method 2-2 may be added.

[0293] In order to support multiple streams of XR services, multiple DRXs are configured for the UE, and a configuration / indication operation is proposed to indicate its monitoring adaptation. In this way, the UE can effectively support multiple streams of XR services and operate to save power by receiving the monitoring adaptation indication without any problems.

[0294] A method for indicating / configuring a PDCCH monitoring pattern for reducing power consumption while enabling a UE configured with multi-DRX operation to support multiple streams of an XR service and operate the UE accordingly is proposed. In this way, a DRX operation for receiving an XR packet can be performed while reducing power consumption by controlling PDCCH monitoring.

[0295] Fig.13 is a diagram illustrating monitoring adaptation of a UE configured with multi-DRX operation.

[0296] Reference Fig.13 , the UE may receive a multi-DRX configuration from the network (A01). The multi-DRX configuration may include a DRX cycle of each DRX, a DRX timer, and / or monitoring adaptation related information (eg, search space set group (SSSG) and skip duration).

[0297] In the example, although Fig.13 Not shown in the figure, according to an embodiment, the network may send a wake-up signal (not shown) to the UE after providing the multi-DRX configuration (A01), and the UE may start the DRX active time based on the wake-up signal. Alternatively, the wake-up signal may be omitted.

[0298] The UE may start the active time in each DRX based on the multi-DRX configuration. Fig.13 In the embodiment, it is assumed that the multi-DRX configuration includes DRX0 and DRX1. The UE may perform the first PDCCH monitoring (A02) in the active time of DRX0 and perform the second PDCCH monitoring (A03) in the active time of DRX1.

[0299] The network indicates monitoring adaptation to the UE through DCI (A04). The DCI may include information indicating the DRX for which the monitoring adaptation indication included in the DCI is intended (e.g., method 1 and method 2). In addition, in the case of multiple cells, the DCI may include information indicating the cell for which the monitoring adaptation indication included in the DCI is intended (e.g., method 3).

[0300] The UE may perform the indicated PDCCH monitoring adaptation in the corresponding DRX (A05).

[0301] For example, the corresponding DRX indicating PDCCH monitoring adaptation may be a single DRX such as DRX0 or DRX1, or may include a plurality of DRXs.

[0302] For example, the corresponding DRX indicating PDCCH monitoring adaptation may be different DRXs in a plurality of cells.

[0303] According to the proposed method, a multi-DRX operation for supporting multiple streams and its PDCCH monitoring adaptation operation can be supported. In particular, monitoring adaptation can be indicated by specifying DRX in a multi-DRX environment. In this way, multiple streams of XR services can be smoothly supported, while unnecessary PDCCH monitoring in each DRX can be reduced, resulting in a power saving effect.

[0304] Fig.14 is a diagram illustrating signal reception of a UE according to an embodiment.

[0305] Reference Fig.14 , the UE can receive multiple DRX configurations (B05).

[0306] The UE may receive PDCCH monitoring adaptation information related to at least one of a plurality of DRX configurations (B10).

[0307] The UE may monitor the PDCCH based on each DRX on-duration of the plurality of DRX configurations and the PDCCH monitoring adaptation information (B15).

[0308] Based on a gap or overlap between a first time period of a first DRX configuration and a second time period of a second DRX configuration among multiple DRX configurations, monitoring of the first PDCCH may be performed jointly during the first time period and the second time period based on the first PDCCH monitoring adaptation information.

[0309] Based on the fact that the first time period and the second time period at least partially overlap, monitoring of the first PDCCH may be performed throughout the first time period and the second time period based on the first PDCCH monitoring adaptation information.

[0310] Based on the second time period starting within a predetermined time from the end of the first time period, the monitoring of the first PDCCH started in the first time period may be performed until the second time period ends.

[0311] The first PDCCH monitoring adaptation information may be related to the first DRX configuration. The first time period may be the DRX on duration or the DRX active time of the first DRX configuration, and the second time period may be the DRX on duration or the DRX active time of the second DRX configuration. The first time period may start earlier than the second time period.

[0312] The monitoring of the second PDCCH may be performed based on the second PDCCH monitoring adaptation information during a third time period of the second DRX configuration that is different from the second time period.

[0313] The first PDCCH monitoring adaptation information may be used to skip monitoring of at least one search space set among the search space sets configured for the UE or to monitor a first group of search space sets.

[0314] The first time period of the first DRX configuration and the second time period of the second DRX configuration may be configured according to different DRX cycles.

[0315] Fig.15 is a diagram illustrating signal transmission of a BS according to an embodiment.

[0316] Reference Fig.15 , BS can send multiple DRX configurations (C05).

[0317] The BS may transmit PDCCH monitoring adaptation information regarding at least one of a plurality of DRX configurations (C10).

[0318] The BS may transmit the PDCCH based on each DRX on-duration of the plurality of DRX configurations and the PDCCH monitoring adaptation information (C15).

[0319] Based on a gap or overlap between a first time period of a first DRX configuration and a second time period of a second DRX configuration among multiple DRX configurations, the BS may jointly perform transmission of a first PDCCH during the first time period and the second time period based on first PDCCH monitoring adaptation information.

[0320] Based on the first time period and the second time period at least partially overlapping, the first PDCCH monitoring adaptation information may be applied throughout the first time period and the second time period.

[0321] Based on the second time period starting within a predetermined time from the end of the first time period, the application of the first PDCCH started in the first time period may be performed until the second time period ends.

[0322] The first PDCCH monitoring adaptation information may be related to the first DRX configuration. The first time period may be the DRX on duration or the DRX active time of the first DRX configuration, and the second time period may be the DRX on duration or the DRX active time of the second DRX configuration. The first time period may start earlier than the second time period.

[0323] Transmission of the second PDCCH may be performed based on the second PDCCH monitoring adaptation information during a third time period of the second DRX configuration that is different from the second time period.

[0324] The first PDCCH monitoring adaptation information may be used to instruct the UE to skip monitoring of at least one search space set among the search space sets configured for the UE or to monitor a first group of search space sets.

[0325] The first time period of the first DRX configuration and the second time period of the second DRX configuration may be configured according to different DRX cycles.

[0326] Fig.16 A communication system 1 applied to the present disclosure is shown.

[0327] Reference Fig.16 , the 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 a head mounted device (HMD), a head up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital sign, a vehicle, a robot, etc. Handheld devices may include smart phones, smart boards, 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.

[0328] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0329] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Herein, wireless communication / connection may be established through 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 send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b may send / receive signals through various physical channels. To this end, at least a portion of various configuration information for configuring processes for sending / 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.

[0330] Fig.17 A wireless device suitable for use with the present disclosure is shown.

[0331] Reference Fig.17 , the first wireless device 100 and the second wireless device 200 may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to Fig.16 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0332] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and 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 description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 102 may process the information in 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 codes including commands for executing part or all of the processes controlled by the processor 102 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. 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 through 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 an embodiment of the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0333] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further 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 description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 202 may process the information in 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 codes including commands for executing part or all of the processes controlled by the processor 202 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. 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 through 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 an embodiment of the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0334] In the following, 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. 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 description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. 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 description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0335] 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 flow charts 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 flow charts 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.

[0336] 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 disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of 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 by various technologies such as wired or wireless connections.

[0337] One or more transceivers 106 and 206 may send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow chart 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 description, function, process, proposal, method and / or operation flow chart 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 send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 may perform 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 send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation 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 as to process received user data, control information, radio signals / channels, etc. 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.

[0338] Fig.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 Fig.16 ) are implemented in various forms.

[0339] Reference Fig.18 , the wireless devices 100 and 200 may correspond to Fig.17The wireless devices 100 and 200 of the present invention 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 Fig.17 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Fig.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 send information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0340] 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 the form of, but not limited to, a robot ( Fig.16 100a), vehicles ( Fig.16 100b-1 and 100b-2), XR devices ( Fig.16 100c), handheld device ( Fig.16 100d), household appliances ( Fig.16 100e), IoT devices ( Fig.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 ( Fig.16 400), BS( Fig.16 200), network nodes, etc. The wireless device can be used in a mobile or fixed location according to the usage example / service.

[0341] exist Fig.18In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through 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 through the communication unit 110. The various elements, components, units / parts 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.

[0342] Fig.19 A vehicle or an autonomous vehicle applied to the present disclosure is shown. The vehicle or the autonomous vehicle can be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0343] Reference Fig.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 Fig.18 Block 110 / 130 / 140.

[0344] The communication unit 110 may send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may 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 device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c 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 position 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 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a 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, and the like.

[0345] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically obtain the latest traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. In the middle of 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 about the vehicle position, autonomous driving path, and / or driving plan to an 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.

[0346] The above-mentioned embodiments correspond to the combination of elements and features of the present disclosure in a prescribed form. And, unless explicitly mentioned, each element or feature may be regarded as selective. Each element or feature may be implemented in a form that is not combined with other elements or features. In addition, the embodiments of the present disclosure can be implemented 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. And, the embodiment may be configured by combining claims that do not have a clear reference relationship in the attached claims, or may be included as a new claim by modification after submitting the application.

[0347] Those skilled in the art will appreciate that the present disclosure may be implemented in other specific forms other than those described herein without departing from the spirit and essential characteristics of the present disclosure. Therefore, the above-described embodiments should be interpreted as being illustrative in all respects, rather than restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents, rather than by the above description, and all changes falling within the meaning and equivalent scope of the appended claims are intended to be covered therein.

[0348] Industrial Applicability

[0349] The present disclosure is applicable to UE, BS or other devices in a wireless mobile communication system.

Claims

1. A method for receiving a signal by a user equipment UE in a wireless communication system, the method comprising the following steps: Receiving multiple discontinuous reception (DRX) configurations; receiving physical downlink control channel (PDCCH) monitoring adaptation information related to at least one of the plurality of DRX configurations; as well as monitoring the PDCCH based on the respective DRX on-durations of the plurality of DRX configurations and the PDCCH monitoring adaptation information, Wherein, based on the gap or overlap between the first time period of the first DRX configuration and the second time period of the second DRX configuration among the multiple DRX configurations, the monitoring of the first PDCCH is jointly performed during the first time period and the second time period based on the first PDCCH monitoring adaptive information.

2. The method according to claim 1, wherein: Based on the first time period and the second time period at least partially overlapping, the monitoring of the first PDCCH is performed throughout the first time period and the second time period based on the first PDCCH monitoring adaptation information.

3. The method according to claim 1, wherein: Based on the second time period starting within a predetermined time from the end of the first time period, the monitoring of the first PDCCH starting in the first time period is performed until the end of the second time period.

4. The method according to claim 1, wherein: The first PDCCH monitoring adaptation information is related to the first DRX configuration.

5. The method according to claim 4, wherein: The first time period is a DRX on duration or a DRX active time of the first DRX configuration, and the second time period is a DRX on duration or a DRX active time of the second DRX configuration, and The first time period starts earlier than the second time period.

6. The method according to claim 1, wherein: During a third time period of the second DRX configuration different from the second time period, monitoring of the second PDCCH is performed based on second PDCCH monitoring adaptation information.

7. The method according to claim 1, wherein: The first PDCCH monitoring adaptation information is used to skip monitoring of at least one search space set among the search space sets configured for the UE or to monitor a first group of search space sets.

8. The method according to claim 1, wherein: The first time period of the first DRX configuration and the second time period of the second DRX configuration are configured according to different DRX cycles. 9 . A computer-readable recording medium storing 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: Receiving multiple discontinuous reception (DRX) configurations; receiving physical downlink control channel (PDCCH) monitoring adaptation information related to at least one of the plurality of DRX configurations; and monitoring the PDCCH based on the respective DRX on-durations of the plurality of DRX configurations and the PDCCH monitoring adaptation information, and Wherein, based on the gap or overlap between a first time period of a first DRX configuration among the multiple DRX configurations and a second time period of a second DRX configuration, monitoring of the first PDCCH is performed jointly during the first time period and the second time period based on first PDCCH monitoring adaptive information.

11. The device according to claim 10, further comprising: a transceiver, which sends or receives wireless signals under the control of the processor, The device is a user equipment UE operated in a wireless communication system.

12. The device according to claim 10, wherein: The apparatus is a signal processing apparatus configured to control a user equipment UE operating in a wireless communication system.

13. A method for sending a signal by a base station BS in a wireless communication system, the method comprising the following steps: Send multiple discontinuous reception DRX configurations; sending physical downlink control channel (PDCCH) monitoring adaptation information related to at least one of the plurality of DRX configurations; as well as sending a PDCCH based on the respective DRX on-durations of the plurality of DRX configurations and the PDCCH monitoring adaptation information, Wherein, based on the gap or overlap between the first time period of the first DRX configuration and the second time period of the second DRX configuration among the multiple DRX configurations, the transmission of the first PDCCH is jointly performed during the first time period and the second time period based on the first PDCCH monitoring adaptive information.

14. A computer-readable recording medium storing a program for executing the method according to claim 13.

15. 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: Send multiple discontinuous reception DRX configurations; sending physical downlink control channel (PDCCH) monitoring adaptation information related to at least one of the plurality of DRX configurations; and sending a PDCCH based on the respective DRX on-durations of the plurality of DRX configurations and the PDCCH monitoring adaptation information, and Wherein, based on the gap or overlap between the first time period of the first DRX configuration and the second time period of the second DRX configuration among the multiple DRX configurations, the transmission of the first PDCCH is jointly performed during the first time period and the second time period based on the first PDCCH monitoring adaptive information.

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