Method and apparatus for transmitting and receiving radio signals in a wireless communication system

Abstract

A terminal according to the present invention receives configuration information regarding a paging early indication (PEI) including first offset information and second offset information, and monitors a first physical downlink control channel (PDCCH) for the PEI based on the configuration information regarding the PEI, and monitors a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI, where the first offset information indicates an interval between a paging frame (PF) and a first frame including a monitoring occasion of the first PDCCH, and the second offset information indicates an interval between a first monitoring occasion among the monitoring occasions of the first PDCCH and the start of the first frame.

Description

[Technical field]

[0001] The present invention relates to a wireless communication system, and more particularly to a method and apparatus for transmitting and receiving a wireless signal. [Background technology]

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. Generally, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, etc. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a method and apparatus for efficiently performing a process of transmitting and receiving a radio signal.

[0004] The technical problem to be achieved by the present invention is not limited to the above technical problem, and other technical problems not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0005] In a wireless communication system according to an aspect of the present invention, a method for a terminal receiving a signal includes receiving configuration information for a paging early indication (PEI), monitoring a first physical downlink control channel (PDCCH) for the PEI based on the configuration information for the PEI, and monitoring a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI detected as a result of monitoring the first PDCCH. The PEI is associated with a PO of one or more paging frames (PFs) among periodic PFs. The terminal monitors the first PDCCH for the PEI based on first offset information and second offset information included in the configuration information for the PEI. The first offset information indicates an interval between a leading PF among the one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information indicates an interval between a leading monitoring occasion among monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information is frame-level.

[0006] The configuration information for the PEI is received by higher layer signaling, which is associated with a system information block (SIB).

[0007] The second offset information indicates an interval from the start of the first frame to the start of a first monitoring opportunity of the first PDCCH.

[0008] The PEI is associated with a PO of a first PF and a PO of a second PF among the periodic PFs, the first PF and the second PF being consecutive PFs.

[0009] The PFs associated with the PEI are constrained to be contiguous with each other.

[0010] The granularity of the second offset information is different from the granularity of the first offset information.

[0011] The granularity of the second offset information is the symbol level.

[0012] In another aspect of the present invention, there is provided a computer-readable recording medium having a program recorded thereon for carrying out the above-mentioned signal receiving method.

[0013] In yet another aspect of the present invention, there is provided a terminal for performing the above-described signal receiving method.

[0014] In yet another aspect of the invention, there is provided a device for controlling a terminal performing the above-described signal reception method.

[0015] In a wireless communication system according to another aspect of the present invention, a method for transmitting a signal by a base station includes transmitting configuration information for a paging early indication (PEI), transmitting a first physical downlink control channel (PDCCH) for the PEI based on the configuration information for the PEI, and transmitting a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI transmitted by the first PDCCH. The PEI is associated with a PO of one or more PFs among periodic paging frames (PFs). The base station transmits the first PDCCH for the PEI based on first offset information and second offset information included in the configuration information for the PEI. The first offset information indicates an interval between a leading PF among the one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information indicates an interval between a leading monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information is frame-level.

[0016] In yet another aspect of the present invention, there is provided a base station for carrying out the above-described signal transmission method. Effect of the Invention

[0017] According to one embodiment of the present invention, in determining the location of a PEI Occasion, the same frame level offset is applied to POs related to the same paging frame, thereby achieving the effect of signaling overhead reduction.

[0018] The effects obtained by the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief description of the drawings]

[0019] [Figure 1] 1 is a diagram illustrating physical channels used in a 3GPP (registered trademark) system, which is an example of a wireless communication system, and a general signal transmission method using these channels. [Diagram 2] FIG. 2 illustrates an example of a radio frame structure. [Diagram 3] FIG. 2 illustrates a resource grid of slots. [Figure 4] A diagram showing an example of mapping physical channels within a slot. [Diagram 5] A diagram illustrating the transmission and reception process of a PDCCH (Physical Downlink Control Channel). [Figure 6] 1 is a diagram illustrating a PDSCH reception and ACK / NACK transmission process. [Figure 7] FIG. 2 illustrates a PUSCH transmission process. [Figure 8] FIG. 1 is a diagram showing an LTE-based wakeup signal. [Figure 9] 4 is a flowchart showing the operation of a base station and a terminal to which the method according to the present invention can be applied; [Figure 10] 4 is a flowchart showing the operation of a base station and a terminal to which the method according to the present invention can be applied; [Figure 11] FIG. 1 is a diagram for explaining the determination of PF and PO associated with NR standard DRX operation. [Figure 12] 11 is a diagram for explaining a method of indicating PEI_F and PEI_O according to one embodiment of the present invention. [Figure 13] 2 is a diagram illustrating a signal receiving method of a terminal according to an embodiment of the present invention. [Figure 14]2 is a diagram illustrating a signal transmission method of a base station according to one embodiment of the present invention. [Figure 15] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 16] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 17] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 18] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 19] 1 is a diagram illustrating an example of a DRX (Discontinuous Reception) operation that can be applied to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The following technologies can be used for various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) 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.

[0021] As more communication devices require larger communication capacity, the need for improved mobile broadband communication compared to existing RATs (Radio Access Technology) is emerging. In addition, massive MTC (Machine Type Communications), which connects multiple devices and objects to provide various services anytime and anywhere, is one of the important issues to be considered in next-generation communication. In addition, communication system design considering reliability and latency-sensitive services / terminals is being discussed. Thus, the introduction of next-generation RATs considering eMBB (enhanced Mobile BroadBand Communication), massive MTC, URLLC (Ultra-Reliable and Low Latency Communication), etc. is being discussed, and in one embodiment of the present invention, the corresponding technology is referred to as NR (New radio or New RAT) for convenience.

[0022] For clarity of explanation, 3GPP NR will be mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0023] For background, terms, definitions, abbreviations, and the like related to this invention, the following documents may be referred to (Incorporated by Reference):

[0024] 3GPP LTE

[0025] -TS36.211:Physical channels and modulation

[0026] -TS36.212:Multiplexing and channel coding

[0027] -TS36.213:Physical layer procedures

[0028] -TS36.300:Overall description

[0029] -TS36.321:Medium Access Control(MAC)

[0030] -TS36.331:Radio Resource Control(RRC)

[0031] 3GPP NR

[0032] -TS38.211:Physical channels and modulation

[0033] -TS38.212:Multiplexing and channel coding

[0034] -TS38.213:Physical layer procedures for control

[0035] -TS38.214:Physical layer procedures for data

[0036] -TS38.300:NR and NG-RAN Overall Description

[0037] -TS38.321:Medium Access Control(MAC)

[0038] -TS38.331:Radio Resource Control(RRC) protocol specification

[0039] -TS37.213:Introduction of channel access procedures to unlicensed spectrum for NR-based access

[0040] Terms and Abbreviations

[0041] -PSS:Primary Synchronization Signal

[0042] -SSS:Secondary Synchronization Signal

[0043] -CRS: Cell reference signal

[0044] -CSI-RS:Channel State Information Reference Signal

[0045] -TRS:Tracking Reference Signal

[0046] -SS: Search Space

[0047] -CSS: Common Search Space

[0048] -USS:UE-specific Search Space

[0049] -PDCCH: Physical Downlink Control Channel; in the following description, PDCCH is used to represent various structures of PDCCHs that can be used for the same purpose (eg, Narrowband PDCCH (NPDCCH), MTC PDCCH (MPDCCH), etc.).

[0050] -PO: Paging Occasion

[0051] -MO:Monitoring Occasion

[0052] -BD: Blind Decoding

[0053] -DCI:Downlink Control Information

[0054] - WUS: Wake Up Signal; in the following description, WUS is used to represent other method signals or channels (e.g., PEI (Paging Early Indication)) that perform similar functions.

[0055] -PEI_F: PEI Frame (frame for monitoring PEI)

[0056] -PEI_O: PEI Occasion (Opportunity for monitoring PEI (set of PDCCH monitoring occasions))

[0057] -APEI-MPO method: A method for providing information corresponding to multiple POs using one PEI

[0058] -mx-pattern:Multiplexing Pattern

[0059] In a wireless communication system, a terminal receives information from a base station through a downlink (DL), and transmits information from the base station through an uplink (UL). Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type / purpose of the information transmitted and received.

[0060] FIG. 1 is a diagram illustrating physical channels used in a 3GPP NR system and a general signal transmission method using these channels.

[0061] A terminal that has been turned on in a power-off state or that has newly entered a cell performs an initial cell search operation such as establishing synchronization with a base station in step S101. To this end, the terminal receives a synchronization signal block (SSB) from the base station. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH). The terminal establishes synchronization with the base station based on the PSS / SSS and obtains information such as a cell identity (cell ID). The terminal also obtains broadcast information within the cell based on the PBCH. In addition, the terminal can receive a downlink reference signal (DL RS) during the initial cell search stage to check the state of the downlink channel.

[0062] After completing the initial cell search, in step S102, the terminal receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on information of the physical downlink control channel to obtain more specific system information.

[0063] Thereafter, the terminal performs a random access procedure such as steps S103 to S106 to complete connection to the base station. To this end, the terminal transmits a preamble through a physical random access channel (PRACH) (S103) and receives a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel (S104). In the case of contention based random access, the terminal performs a contention resolution procedure such as transmitting a further physical random access channel (S105) and receiving a physical downlink control channel and a corresponding physical downlink shared channel (S106).

[0064] After performing this procedure, the terminal then receives a physical downlink control channel / physical downlink shared channel (S107) and transmits a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) / physical uplink control channel (Physical Uplink Control Channel, PUCCH) as a general uplink / downlink signal transmission procedure (S108). The control information transmitted by the terminal to the base station is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted via PUCCH, but when control information and traffic data need to be transmitted simultaneously, it is transmitted via PUSCH. In addition, UCI can be transmitted aperiodically via PUSCH upon request / instruction from the network.

[0065] FIG. 2 illustrates the structure of a radio frame. In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 orthogonal frequency division multiplexing (OFDM) symbols depending on the cyclic prefix (CP). If a normal CP is used, each slot contains 14 symbols. If an extended CP is used, each slot contains 12 symbols.

[0066] Table 1 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS when a general CP is used.

[0067] [Table 1]

[0068] *N slot symb :Number of symbols in the slot

[0069] *N frame,u slot : Number of slots in the frame

[0070] *N subframe,u slot : Number of slots in a subframe

[0071] Table 2 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary with the SCS when an extended CP is used.

[0072] [Table 2]

[0073] The frame structure is exemplary only, and the number of subframes, slots, and symbols within a frame can vary.

[0074] In the NR system, OFDM numerology (e.g., SCS) can be set to be different between multiple cells merged into one terminal. Accordingly, the (absolute time) duration of time resources (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) consisting of the same number of symbols can be set to be different between the merged cells. Here, the symbols include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbols).

[0075] FIG. 3 is a diagram illustrating a resource grid of a slot. A slot includes a number of symbols in the time domain. For example, in the case of a general CP, one slot includes 14 symbols, while in the case of an extended CP, one slot includes 12 symbols. A carrier includes a number of subcarriers in the frequency domain. A resource block (RB) is defined as a number of (e.g., 12) consecutive subcarriers in the frequency domain. A BWP is defined as a number of consecutive physical RBs (PRBs) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier includes up to N (e.g., 5) BWPs. Data communication is performed in an activated BWP, and only one BWP is activated for one terminal. In the resource grid, each element is called a resource element (RE), and one complex symbol can be mapped to it.

[0076] FIG. 4 is a diagram showing an example of mapping physical channels into a slot. In an NR system, a frame is characterized by a self-contained structure in which a DL control channel, DL or UL data, and a UL control channel are all included in one slot. For example, the first N symbols in a slot are used to transmit a DL control channel (e.g., PDCCH) (hereinafter, DL control region), and the last M symbols in a slot are used to transmit a UL control channel (e.g., PUCCH) (hereinafter, UL control region). N and M are each an integer equal to or greater than 0. A resource region (hereinafter, data region) between the DL control region and the UL control region is used to transmit DL data (e.g., PDSCH) or UL data (e.g., PUSCH). The GP provides a time gap in the process in which the base station and the terminal switch from a transmission mode to a reception mode or from a reception mode to a transmission mode. Some symbols at the time of switching from DL to UL in a subframe can be set as the GP.

[0077] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the DL-SCH (downlink shared channel), resource allocation information for the UL-SCH (uplink shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, resource allocation information for higher layer control messages such as random access responses transmitted on the PDSCH, transmission power control commands, activation / deactivation of configured scheduling (CS), etc. The DCI includes a cyclic redundancy check (CRC), and the CRC is masked / scrambled to various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or use of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked to a terminal identifier (e.g., Cell-RNTI, C-RNTI). If the PDCCH is for paging, the CRC is masked to a P-RNTI (Paging-RNTI). If the PDCCH is for system information (e.g., System Information Block, SIB), the CRC is masked to a System Information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked to a Random Access-RNTI (RA-RNTI).

[0078] FIG. 5 is a diagram illustrating a PDCCH transmission / reception process.

[0079] Referring to FIG. 5, the base station transmits a CORESET (Control Resource Set) configuration to the terminal (S502). The CORESET is defined by a set of REGs (Resource Element Groups) having a predetermined neurology (e.g., SCS, CP length, etc.). The REG is defined by one OFDM symbol and one (P)RB. Multiple CORESETs for one terminal may overlap in the time / frequency domain. The CORESET is configured by system information (e.g., Master Information Block, MIB) or higher layer (e.g., Radio Resource Control, RRC, layer) signaling. For example, configuration information on a predetermined common CORESET (e.g., CORESET#0) is transmitted by the MIB. For example, a PDSCH carrying SIB1 (system information block1) is scheduled by a specific PDCCH, and CORESET#0 is for transmission of the specific PDCCH. Also, configuration information regarding CORESET#N (e.g., N>0) is transmitted by RRC signaling (e.g., cell-common RRC signaling or terminal-specific RRC signaling, etc.). As an example, terminal-specific RRC signaling carrying CORESET configuration information includes, but is not limited to, various signaling such as, for example, an RRC setup message, an RRC reconfiguration message, and / or BWP configuration information. Specifically, the CORESET configuration includes the following information / fields:

[0080] -controlResourceSetId: Indicates the ID of the CORESET.

[0081] -frequencyDomainResources: Indicates the frequency domain resources of the CORESET. It is indicated by a bitmap, and each bit corresponds to an RB group (= 6 (consecutive) RBs). For example, the MSB (Most Significant Bit) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit whose bit value is 1 is assigned to the frequency domain resources of the CORESET.

[0082] -duration: indicates the time domain resource of CORESET. Indicates the number of consecutive OFDM symbols that constitute CORESET. Duration has a value of 1 to 3.

[0083] -cce-REG-MappingType: Indicates the mapping type between CCE (Control Channel Element) and REG. Interleaved and non-interleaved types are supported.

[0084] -interleaverSize: Indicates the interleaver size.

[0085] -pdcch-DMRS-ScramblingID: indicates the value used for PDCCH DMRS initialization. If pdcch-DMRS-ScramblingID is not included, the physical cell ID of the serving cell is used.

[0086] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0087] -reg-BundleSize: Indicates the REG bundle size.

[0088] -tci-PresentInDCI: Indicates whether the TCI (Transmission Configuration Index) field is included in the DL-related DCI.

[0089] -tci-StatesPDCCH-ToAddList: indicates a subset of the TCI states defined in the PDCCH-configuration. The TCI states are used to provide Quasi-Co-Location (QCL) relationships between DL RSs and PDCCH DMRS ports in the RS set (TCI-States).

[0090] The base station also transmits a PDCCH SS (Search Space) configuration to the terminal (S504). The PDCCH SS configuration is transmitted by higher layer signaling (e.g., RRC signaling). For example, the RRC signaling includes various signaling such as an RRC setup message, an RRC reconfiguration message, and / or BWP configuration information, but is not limited thereto. In FIG. 5, for convenience of explanation, the CORESET configuration and the PDCCH SS configuration are shown to be signaled separately, but the present invention is not limited thereto. For example, the CORESET configuration and the PDCCH SS configuration may be transmitted by one message (e.g., one RRC signaling), or may be transmitted by different messages.

[0091] The PDCCH SS configuration includes information regarding the configuration of a PDCCH SS set. The PDCCH SS set is defined by a set of PDCCH candidates that the terminal monitors (e.g., performs blind detection). One or more SS sets are configured for the terminal. Each SS set is a USS set or a CSS set. For convenience, the PDCCH SS set will be simply referred to as "SS" or "PDCCH SS" hereinafter.

[0092] The PDCCH SS set includes PDCCH candidates. The PDCCH candidates indicate the CCEs that the terminal monitors for PDCCH reception / detection. Here, monitoring includes blind decoding (BD) of the PDCCH candidates. One PDCCH (candidate) consists of 1, 2, 4, 8, or 16 CCEs depending on the aggregation level (AL). One CCE consists of six REGs. Each CORESET configuration is associated with one or more SSs, and each SS is associated with one COREST configuration. One SS is defined based on one SS configuration, and the SS configuration includes the following information / fields:

[0093] -searchSpaceId: Indicates the ID of the SS.

[0094] -controlResourceSetId: Indicates the CORESET related to the SS.

[0095] -monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring periodicity interval (in slot units) and the PDCCH monitoring period offset (in slot units).

[0096] - monitoringSymbolsWithinSlot: Indicates the first OFDM symbol for PDCCH monitoring in a slot where PDCCH monitoring is set. Indicated by a bitmap, each bit corresponds to each OFDM symbol in the slot. The MSB of the bitmap corresponds to the first OFDM symbol in the slot. The OFDM symbol corresponding to a bit whose bit value is 1 corresponds to the first symbol of the CORESET in the slot.

[0097] -nrofCandidates: indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8) for AL={1, 2, 4, 8, 16}.

[0098] -searchSpaceType: Indicates CSS (Common Search Space) or USS (UE-specific search space), and indicates the DCI format used for the corresponding SS type.

[0099] In the future, the base station generates a PDCCH and transmits it to the terminal (S506), and the terminal monitors PDCCH candidates in one or more SSs to receive / detect the PDCCH (S508). An opportunity (e.g., time / frequency resource) for monitoring a PDCCH candidate is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities are configured within a slot.

[0100] Table 3 illustrates the characteristics of each SS type.

[0101] [Table 3]

[0102] Table 4 illustrates an example of a DCI format transmitted via the PDCCH.

[0103] [Table 4]

[0104] DCI format 0_0 is used to schedule a TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​is used to schedule a TB-based (or TB-level) PUSCH or a Code Block Group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule a TB-based (or TB-level) PDSCH, and DCI format 1_1 is used to schedule a TB-based (or TB-level) PDSCH or a CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 is called UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 is called DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic SFI) to a terminal, and DCI format 2_1 is used to transmit downlink pre-Emption information to a terminal. DCI format 2_0 and / or DCI format 2_1 are transmitted to terminals in a corresponding group via a group common PDCCH, which is a PDCCH transmitted to terminals defined in one group.

[0105] DCI format 0_0 and DCI format 1_0 are called fallback DCI formats, and DCI format 0_1 ​​and DCI format 1_1 are called non-fallback DCI formats. The fallback DCI format maintains the same DCI size / field configuration regardless of the terminal settings. On the other hand, the non-fallback DCI format has a different DCI size / field configuration depending on the terminal settings.

[0106] The mapping type from CCE to REG is set to either a non-interleaved CCE-REG mapping type or an interleaved CCE-REG mapping type.

[0107] - Non-interleaved CCE-REG mapping type (or local mapping type) (Figure 5): 6 REGs for a given CCE constitute one REG bundle, and all REGs for a given CCE are contiguous. One REG bundle corresponds to one CCE.

[0108] -Interleaved CCE-REG mapping type (or distributed mapping type): 2, 3 or 6 REGs for a given CCE constitute one REG bundle, and the REG bundles are interleaved within a CORESET. A REG bundle in a CORESET consisting of 1 to 2 OFDM symbols consists of 2 or 6 REGs, and a REG bundle in a CORESET consisting of 3 OFDM symbols consists of 3 or 6 REGs. The size of the REG bundle is set for each CORESET.

[0109] Figure 6 illustrates a process of receiving a PDSCH and transmitting an ACK / NACK. Referring to Figure 6, a terminal detects a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI format 1_0, 1_1), and the PDCCH indicates DL allocation-to-PDSCH offset (K0) and PDSCH-HARQ-ACK report offset (K1). For example, DCI formats 1_0, 1_1 include the following information:

[0110] -Frequency domain resource assignment: Indicates the RB set assigned to the PDSCH.

[0111] Time domain resource assignment: Indicates K0 (e.g., slot offset), the starting position of the PDSCH within slot #n+K0 (e.g., OFDM symbol index) and the length of the PDSCH (e.g., number of OFDM symbols).

[0112] -PDSCH-to-HARQ_feedback timing indicator: Indicates K1.

[0113] -HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB).

[0114] - PUCCH Resource Indicator (PRI): Indicates a PUCCH resource to be used for UCI transmission among multiple PUCCH resources in a PUCCH resource set.

[0115] Thereafter, the terminal receives the PDSCH from slot #(n+K0) according to the scheduling information of slot #n, and then transmits UCI via PUCCH in slot #(n1+K1) when the reception of the PDSCH is completed in slot #n1 (where n+K0≦n1). Here, the UCI includes a HARQ-ACK response to the PDSCH. For convenience, it is assumed in FIG. 6 that the SCS for the PDSCH and the SCS for the PUCCH are the same and that slot #n1=slot #n+K0, but the present invention is not limited thereto. If the SCSs are different, K1 is indicated / interpreted based on the SCS of the PUCCH.

[0116] If the PDSCH is configured to transmit up to 1 TB, the HARQ-ACK response consists of 1 bit. If the PDSCH is configured to transmit up to 2 TB, the HARQ-ACK response consists of 2 bits if spatial bundling is not configured, and 1 bit if spatial bundling is configured. If the transmission time of the HARQ-ACK for multiple PDSCHs is specified as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes the HARQ-ACK response for multiple PDSCHs.

[0117] Whether or not the UE performs spatial bundling for the HARQ-ACK response is configured for each cell group (e.g., RRC / higher layer signaling). As an example, spatial bundling is configured individually for each of the HARQ-ACK response transmitted via the PUCCH and / or the HARQ-ACK response transmitted via the PUSCH.

[0118] Spatial bundling is supported when the maximum number of TBs (or codewords) that can be received at one time (or scheduled by one DCI) in a corresponding serving cell is two (or more than two) (for example, when the upper layer parameter maxNrofCodeWordsScheduledByDCI corresponds to 2-TB). Meanwhile, more than four layers are used for 2-TB transmission, and up to four layers are used for 1-TB transmission. As a result, when spatial bundling is configured in a corresponding cell group, spatial bundling is performed on serving cells in the corresponding cell group that can schedule more than four layers. A terminal that wishes to transmit a HARQ-ACK response through spatial bundling on a corresponding serving cell can generate a HARQ-ACK response by performing a bit-wise logical AND operation on A / N bits for multiple TBs.

[0119] For example, assuming that a terminal receives DCI scheduling 2-TB and receives 2-TB via PDSCH based on the DCI, a terminal performing spatial bundling can generate a single A / N bit by logically ANDing the first A / N bit for the first TB and the second A / N bit for the second TB. As a result, if both the first TB and the second TB are ACK, the terminal reports an ACK bit value to the base station, and if both TBs are NACK, the terminal reports a NACK bit value to the base station.

[0120] For example, if only 1-TB is actually scheduled on a serving cell configured to receive 2-TB, the terminal can generate a single A / N bit by logically ANDing the A / N bit for the 1-TB with a bit value of 1. As a result, the terminal reports the A / N bit for the 1-TB to the base station as is.

[0121] A base station / terminal has multiple parallel DL HARQ processes for DL ​​transmission. Multiple parallel HARQ processes allow DL transmission to be performed continuously while waiting for HARQ feedback for successful or unsuccessful reception of 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 related to the number of transmissions of MAC Physical Data Blocks (PDUs) in the buffer, HARQ feedback for MAC PDUs in the buffer, current redundancy version, etc. Each HARQ process is distinguished by a HARQ process ID.

[0122] 7 illustrates a PUSCH transmission process. Referring to FIG 7, a UE detects a PDCCH in slot #n. Here, the PDCCH includes uplink scheduling information (e.g., DCI formats 0_0 and 0_1). DCI formats 0_0 and 0_1 include the following information:

[0123] Frequency domain resource assignment: Indicates the RB set assigned to the PUSCH.

[0124] -Time domain resource assignment: indicates the slot offset K2, the starting position (e.g., symbol index) and length (e.g., number of OFDM symbols) of the PUSCH within the slot. The starting symbol and length are indicated by the Start and Length Indicator Value (SLIV) or are indicated respectively.

[0125] Thereafter, the terminal transmits a PUSCH in slot #(n+K2) according to the scheduling information of slot #n, where the PUSCH includes a UL-SCH TB.

[0126] Paging

[0127] The network (i) approaches UEs in RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states by a paging message, and (ii) notifies the terminal of system information changes and ETWS / CMAS (Earthquake and Tsunami Warning System / Commercial Mobile Alert System) instructions to UEs in RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states by a short message. Both paging messages and short messages are transmitted based on the P-RNTI-based PDCCH, but the paging message is transmitted on the Paging Control Channel (PCCH), which is a logical channel, while the short message is transmitted directly via the PDCCH, which is a physical channel. Since the logical channel PCCH is mapped to the physical channel PDSCH, it can be understood that the paging message is scheduled based on the P-RNTI-based PDCCH.

[0128] While in RRC_IDLE, the UE monitors the paging channel for core network (CN)-initiated paging. In RRC_INACTIVE, the UE also monitors the paging channel for radio access network (RAN)-initiated paging. The UE does not need to monitor the paging channel continuously. Paging DRX defines that a UE in RRC_IDLE or RRC_INACTIVE monitors the paging channel only during one Paging Occasion (PO) per DRX cycle. The paging DRX period is configured by the network as follows:

[0129] 1) In the case of CN-initiated paging, the basic period is broadcast by the system information.

[0130] 2) In the case of CN-initiated paging, the UE-specific periodicity is set by NAS signaling.

[0131] 3) In case of RAN-initiated paging, a UE-specific periodicity is set by RRC signaling.

[0132] Because the POs of a UE for CN-initiated and RAN-initiated paging are both based on the same UE ID, the two POs overlap. The number of POs in a DRX period is configured by system information, and the network allocates UEs to POs based on IDs.

[0133] When in RRC_CONNECTED, the UE monitors the paging channel in each PO signaled in the system information for SI change indication and PWS notification. In case of Bandwidth Adaptation (BA), the UE in RRC_CONNECTED monitors only the paging channel of an active BWP with a configured common search space.

[0134] In the case of shared spectrum channel access, an additional PDCCH monitoring period is set in the UE's PO to monitor paging. However, if the UE detects a P-RNTI-based PDCCH transmission in its PO, the UE does not need to monitor the next PDCCH monitoring period in the PO.

[0135] The UE uses Discontinuous Reception (DRX) in the RRC_IDLE and RRC_INACTIVE states to reduce power consumption. The UE monitors one Paging Occasion (PO) per DRX period. A PO is a set of PDCCH monitoring intervals and consists of multiple time slots (e.g., subframes or OFDM symbols) in which paging DCI is transmitted. A Paging Frame (PF) is a radio frame and includes one or more POs or the start of a PO.

[0136] In multi-beam operation, the UE assumes that the same paging message and the same short message are repeated in all transmit beams. The paging message is the same for both RAN-initiated paging and CN-initiated paging.

[0137] When the UE receives the RAN-initiated paging, it initiates the RRC Connection Resume procedure. When the UE receives the CN-initiated paging in the RRC_INACTIVE state, the UE transitions to RRC_IDLE and notifies the NAS.

[0138] The PF and PO for paging are determined as follows:

[0139] - Determination of SFN for PF:

[0140] (SFN+PF_offset) mod T=(T div N)*(UE_ID mod N)

[0141] -Determining the index (i_s) indicating the index of the PO:

[0142] i_s = floor(UE_ID / N) mod Ns

[0143] The following parameters are used in the calculation of PF and i_s:

[0144] -T: UE DRX period (T is determined by the shortest value among the UE-specific DRX value (when configured by RRC and / or higher layers) and the basic DRX value broadcast in system information, and in the RRC_IDLE state, if the terminal-specific DRX is not configured by the higher layer, the basic value is applied)

[0145] -N:T is the total number of paging frames

[0146] -Ns: Number of POs in PF

[0147] -PF_offset: The offset used to determine the PF

[0148] -UE_ID: 5G-S-TMSI mode 1024

[0149] WUS(Wake-up signal) / PEI(Paging Early Indication)

[0150] In LTE Rel-15 NB-IoT and MTC, a wake-up signal (WUS) is introduced for the purpose of saving power of the terminal. The WUS is a signal that indicates in advance whether or not there is an actual paging transmission in a search space for paging purposes at a specific location. When a base station intends to transmit paging at a paging occasion (PO) at a specific location, it transmits the WUS to a WUS transmission location associated with the PO. The terminal monitors the WUS transmission location associated with a PO at a specific location, and if it detects a WUS at the WUS transmission location, it expects paging to be transmitted at the corresponding PO, and if it does not detect a WUS at the WUS transmission location, it does not expect paging at the corresponding PO, thereby obtaining a power saving gain. In LTE Rel-16 NB-IoT and MTC, a terminal-group WUS is introduced to improve the power saving gain of the Rel-15 WUS. The terminal-group WUS has the advantage of being able to reduce unnecessary wake-ups of the terminal by using a WUS transmission location and sequence determined based on the terminal-group ID of the terminal.

[0151] FIG. 8 is a diagram for explaining a WUS in an LTE system. Referring to FIG. 8, in MTC and NB-IoT, a WUS is used to reduce power consumption associated with paging monitoring. The WUS is a physical layer signal that indicates whether a terminal monitors a paging signal (e.g., MPDCCH / NPDCCH scrambled by P-RNTI) according to a cell configuration. In the case of a terminal not configured with eDRX (i.e., configured with only DRX), the WUS is associated with one PO (N=1). On the other hand, in the case of a terminal configured with eDRX, the WUS can be associated with one or more POs (N≧1). If a WUS is detected, the terminal monitors the next N POs associated with the WUS. On the other hand, if a WUS is not detected, the terminal maintains a sleep mode by omitting PO monitoring until monitoring the next WUS. The terminal receives configuration information for the WUS from a base station and monitors the WUS based on the WUS configuration information. The configuration information for the WUS includes, for example, a maximum WUS duration, the number of consecutive POs associated with the WUS, gap information, and the like. The maximum WUS interval indicates the maximum time interval in which the WUS is transmitted, and is expressed as a ratio to the maximum number of repetitions (e.g., Rmax) associated with the PDCCH (e.g., MPDCCH, NPDCCH). Although the terminal expects repeated WUS transmissions within the maximum WUS interval, the actual number of WUS transmissions may be less than the maximum number of WUS transmissions within the maximum WUS interval. For example, the number of WUS repetitions is less for terminals in good coverage. The resource / opportunity in which the WUS is transmitted within the maximum WUS interval is called the WUS resource. The WUS resource is defined by multiple consecutive OFDM symbols and multiple consecutive subcarriers. The WUS resource is defined by multiple consecutive OFDM symbols and multiple consecutive subcarriers in a subframe or slot. For example, the WUS resource is defined by 14 consecutive OFDM symbols and 12 consecutive subcarriers. A terminal that detects a WUS does not monitor the WUS until the first PO associated with the WUS. If the WUS is not detected during the maximum WUS interval, the terminal does not monitor the paging signal in the PO associated with the WUS (or remains in sleep mode).

[0152] In a communication system such as NR, whether the UE monitors or provides paging DCI in a PO is indicated by a PEI (e.g., a sequence- or DCI-based Paging Early Indication). If the UE successfully detects the PEI, it monitors the paging DCI (and / or the PDSCH carrying the corresponding paging message). If the PEI is not detected, the UE skips monitoring the paging DCI in the corresponding PO.

[0153] Reception of Paging Early Indication

[0154] In communication systems such as LTE and NR, paging is used for triggering RRC setup, system information modification, and / or PWS / ETWS notification, etc. The terminal monitors the PDCCH at the PO position set by the base station, and when it detects DCI scrambled in the P-RNTI, it performs an operation instructed by the DCI.

[0155] In LTE Rel-15 NB-IoT and MTC, a wake-up signal (WUS) is introduced to save power for terminals. The WUS is a signal that indicates whether or not there is an actual paging transmission in a paging occasion (PO) at a specific location. When a base station wants to transmit paging to a PO at a specific location, it transmits the WUS to a WUS transmission location associated with the PO. The terminal monitors the WUS transmission location associated with a PO at a specific location, and if it detects a WUS at the WUS transmission location, it expects paging to be transmitted at the corresponding PO, and if it does not detect a WUS at the WUS transmission location, it does not expect paging at the corresponding PO, thereby obtaining a power saving gain. In LTE Rel-16 NB-IoT and MTC, a UE group WUS is introduced to improve the power saving gain of the Rel-15 WUS. The UE group WUS has the advantage of reducing the probability of unnecessary wake-up of the terminal by using the WUS transmission location and sequence determined based on the UE group ID of the terminal.

[0156] In Rel-16 NR, a DCI-based power saving technique is introduced to support power saving in connected mode. For this purpose, new DCI formats 2-6 are defined, and the base station indicates the bit position that the corresponding terminal monitors on DCI format 2-6, and the terminal determines the power saving operation during the active time period based on the bit information of the corresponding position.

[0157] As discussed in Rel-16 NB-IoT and MTC, when monitoring the PO of a terminal in idle / dormant mode, if paging is transmitted for other terminals sharing the same PO, unnecessary wake-up may occur, which may increase the power consumption of the terminal. As mentioned above, the current NR introduces a DCI-based method to reduce unnecessary monitoring of terminals in connected mode to achieve power saving effects, but the same (or similar) method has not yet been defined for idle / dormant mode. In Rel-17 NR, the introduction of PEI (Paging Early Indication), which provides information about paging prior to PO, is being discussed to save power for terminals. As information about paging, wake-up instructions for UE groups (i.e., the entire set of UE_IDs that can expect paging in a specific PO), wake-up instructions for UE subgroups (i.e., subgroups formed by subdividing a specific UE group), short messages, and instructions on the assumption of TRS / CSI-RS that idle / dormant mode terminals can expect are being discussed.

[0158] As a method for determining the location of the PEI, a method in which the terminal monitors the PEI according to an offset from the corresponding PO is considered. In general, when the offset between the PEI and the PO is small, in the case of a paging terminal, a gain may be obtained in that the micro sleep time is reduced and the paging latency is minimized, but in the case of a terminal that is not paged, a relatively low power saving gain may be obtained. On the other hand, when the offset between the PEI and the PO is large, the power saving gain of a terminal that is not paged may be high, but there may be a disadvantage that the length of unnecessary micro sleep and the paging latency may increase. In consideration of this, a method is considered in which the magnitude of the offset between the PEI and the PO is allowed to be configured by the base station in consideration of the network situation and the characteristics of the terminal to be served.

[0159] In this way, when the base station can adjust the offset between the PEI and the PO, slot-based offset adjustment is required for PEI location determination with a level of scheduling flexibility similar to that of PO location determination in conventional NR. In addition, to increase the power saving gain of the terminal and ensure the number of SSBs (e.g., SSBs required for channel measurement to receive paging PDCCH / PDSCH) required by the terminal after PEI acquisition, an offset size unit of several frames or more may be required. However, when an offset of several tens of ms is configured with slot-level granularity, the burden of signaling overhead may increase. In addition, when considering the use of search space ID #0 as one method of determining the conventional paging search space, it is necessary to design an offset determination method so that a similar method is used when configuring the PEI search space.

[0160] Considering these problems and background, a method for determining a PEI monitoring opportunity is proposed. The proposed method provides the advantage of guaranteeing the granularity of the slot-based offset for a period of tens of ms, while at the same time not significantly increasing signaling overhead. In addition, when the conventional CORESET and search space configuration method is used, the increase in signaling overhead is minimized, and there is an advantageous effect in guaranteeing coexistence with conventional terminals.

[0161] Although the following description will focus mainly on configuration for transmitting and receiving PEI, the present invention is not limited thereto and can be applied to any physical channel / signal or to other physical channel / signal positions.

[0162] In addition, although the following description is based on a structure in which the PEI is transmitted and received in the form of DCI format / PDCCH, the present invention is not limited thereto and can also be applied to sequence-based PEI. As an example, a PDCCH monitoring opportunity is a term generally used for a monitoring period for transmitting and receiving a PDCCH, but when a sequence-based PEI is used, it can also mean a position for monitoring a sequence.

[0163] The following description will be given based on an example of an NR system, but the present invention is not limited to this and can be applied to various wireless communications. One or more of the following methods may be combined or implemented independently. Terms, symbols, procedures, etc. may be replaced with other terms, symbols, procedures, etc.

[0164] FIG. 9 illustrates the operation of a base station to which the method according to the invention can be applied.

[0165] The base station generates configuration information related to the PEI and transmits it (FC101). This configuration information may include configuration information related to a monitoring opportunity of the PEI, etc. As an example, the configuration information is transmitted using a higher layer signal (e.g., SIB or RRC signaling).

[0166] Thereafter, when the base station wishes to transmit information such as a paging message or a shot message to a specific terminal, the base station transmits the PEI at a position where the specific terminal monitors the PEI, for example, at a frame (hereinafter, PEI_F) and slot (hereinafter, PEI_O) position, based on the configuration information provided in step FC101 (FC102).

[0167] Thereafter, if the base station has information such as a paging message or a shot message to transmit, it transmits the PDCCH / PDSCH at the position of the PO corresponding to the PEI transmitted in step FC102 (FC103).

[0168] FIG. 10 illustrates the operation of a terminal to which the method according to the invention can be applied.

[0169] The terminal receives configuration information related to the PEI and applies the same (FC201). At this time, the configuration information may include configuration information related to a monitoring opportunity of the PEI, etc. As an example, in order to receive the configuration information, an acquisition procedure of a higher layer signal (e.g., SIB or RRC signaling) is performed.

[0170] Thereafter, the terminal performs a PEI monitoring operation at a position where the PEI can be expected to be received, for example, at the position of a frame (PEI_F) and a slot (PEI_O), based on the setting information received in step FC201 (FC202).

[0171] If the PEI instructs the PO to be monitored in step FC202, the UE receives the PDCCH / PDSCH at the position of the PO corresponding to the received PEI (FC203).

[0172] According to the configuration information provided by the base station, the terminal monitors the PEI opportunity (hereinafter, PEI_O) before monitoring the PO every DRX cycle. One PEI_O is a set of one or more PDCCH monitoring opportunities, and is composed of multiple time slots, by which the PEI_DCI is transmitted. One PEI frame (hereinafter, PEI_F) consists of one radio frame, and includes one or more PEI_Os or the start point of the PEI_O.

[0173] In a multi-beam operation situation, the terminal may assume that some information is repeated in all transmission beams in the PDCCH monitoring opportunity constituting the PEI_O. In this case, the some information that is repeatedly transmitted includes UE group / subgroup indication, shot message, and / or TRS / CSI-RS indication information, etc. However, if the TRS / CSI-RS indication information included in the PEI DCI is a beam-specific indication (e.g., an indication that targets only TRS / CSI-RS that can assume the same QCL as the corresponding PEI transmission), the corresponding information is not repeated in all transmission beams and may be different for each transmission beam.

[0174] Below, we propose a method for determining PEI_F and PEI_O so that a terminal can monitor the PEI.

[0175] Proposal 1: Setting the frame offset between PF and PEI_F

[0176] In order to determine the location of the PEI_F, the terminal can use information on the location of the paging frame (PF) that the terminal should monitor and the offset from the corresponding PF (hereinafter, Offset_F). In this case, the PF follows the definition of the PF in the conventional (e.g., Rel-15 / 16) NR. Specifically, when DRX is configured, paging follows 3GPP TS38.304.

[0177] Table 5 is an excerpt from Section 7.1 of 3GPP TS38.304.

[0178] [Table 5]

[0179] FIG. 11 shows an example of determining PF and PO in conventional (eg, Rel-15 / 16) NR DRX.

[0180] Referring to Table 5 and FIG. 11, it is assumed that the DRX cycle length T=32 frames, the number of PFs in the DRX cycle N=4, and PF_offset is 7. Therefore, T / N=8, and UE_ID mod N has any value of 0, 1, 2, or 3. Specifically, the PF of a terminal with UE_ID mod N=0 is determined to be SFN25, the PF of a terminal with UE_ID mod N=1 is determined to be SFN1, the PF of a terminal with UE_ID mod N=16 is determined to be SFN9, and the PF of a terminal with UE_ID mod N=24 is determined to be SFN17. Each terminal determines the index (i_S) of a PO to be monitored by itself among Ns POs included in one PF based on the formula floor(UE_ID / N) mod Ns in Table 5.

[0181] Meanwhile, the terminal acquires Offset_F, which indicates an offset from its PF to a PEI frame that the terminal should monitor, through network signaling. For example, Offset_F is indicated to the terminal by a higher layer signal (e.g., SIB or RRC signal) transmitted by the base station, and has a granularity of a frame (i.e., 10 ms).

[0182] For example, referring to FIG. 12, it is assumed that the terminal is configured to monitor the PO of either the 1st PF or the 2nd PF. The determination of the PF and PO follows Table 5 above. An offset between PEI_F and a specific PF, Offset_F, is provided to the terminal by higher layer signaling. Offset_F is an offset indicating an interval from the start of a specific PF to PEI_F at a frame level. When one PEI is associated with the PO of multiple PFs, the first PF of the multiple PFs becomes the specific PF, as in Proposal 3 described later. In the example of FIG. 12, Offset_F indicates an interval from the start of the 1st PF to PEI_F at a frame level. The terminal identifies the start position of the 1st PF among the 1st PF and the 2nd PF associated with the PEI, and determines PEI_F based on Offset_F received by higher layer signaling and the start position of the 1st PF. The PEI_F includes a set of PDCCH monitoring opportunities (PEI_O) that the terminal should monitor to receive the PEI.

[0183] If Offset_F is not specified separately (e.g., there is no network signaling indicating Offset_F), the terminal may use a base value defined by the standard as Offset_F. As an example, if the value of Offset_F is specified by the base station with a size of 3 frames and the PF of the terminal is SFN#n, the terminal assumes that PEI_F is configured at the position of SFN#n-3 and monitors the PEI at the position of this PEI_F.

[0184] On the other hand, the position of the PEI_O of the corresponding terminal in the frame of the PEI_F may be determined by another method. Specifically, the following proposal can be applied to determine the PEI_O within the set PEI_F.

[0185] When PEI_F is determined using Offset_F, which is a frame-unit offset from PF, as in Proposal 1, there is an advantage that the signaling overhead for indicating the PEI monitoring position is minimized.

[0186] Proposal 2: Determination of PDCCH monitoring opportunities for PEI within PEI_F

[0187] The resource / location where the terminal performs PEI monitoring in PEI_F is determined by at least one of (i) an upper layer parameter (hereinafter, para_PEI_SS) for setting the search space of PEI, and (ii) an upper layer parameter (hereinafter, para_first_PEI) for determining the first PEI monitoring opportunity where PDCCH monitoring for PEI starts in PEI_O (PEI_O used by the terminal if configured). For example, para_first_PEI, which is a parameter indicating the first PEI monitoring opportunity in PEI_O where the terminal is set to PEI_F (e.g., PEI_F based on Offset_F of Proposal 1), is provided to the terminal by upper layer signaling. para_first_PEI means the interval (offset) from the start of PEI_F to the start of the first PEI monitoring opportunity. In para_first_PEI, the granularity of para_first_PEI indicating the interval (offset) from the start of PEI_F to the start of the first PEI monitoring opportunity is the symbol level. For example, para_first_PEI indicates the number of symbols from the start symbol of PEI_F to the start symbol of the first PEI monitoring opportunity. For example, referring to FIG. 12, it is assumed that the UE determines PEI_F based on the start position of Offset_F and 1st PF received by higher layer signaling, and PEI_F includes a set of PDCCH monitoring opportunities (PEI_O) that the UE should monitor to receive PEI. The UE determines that PEI_O starts at a position separated by para_first_PEI from the start of PEI_F (i.e., the first PDCCH MO for PEI). The start of PEI_F is the reference point for applying para_first_PEI.

[0188] On the other hand, the use of two offsets with different granularities by combining Offset_F in Proposal 1 and para_first_PEI in Proposal 2 can be understood as a compromise between signaling overhead and scheduling flexibility. If the interval between PEI_F and PF is to be indicated by a symbol level offset, the number of bits required is considerably large, which is not appropriate from the viewpoint of signaling overhead. Therefore, it is preferable to indicate the interval between PEI_F and PF by a frame level offset in order to minimize signaling overhead. On the other hand, if the position of PEI monitoring is restricted to be indicated only at the frame level, a problem of loss of scheduling flexibility occurs. Therefore, it is preferable to indicate the start position of PEI_O within PEI_F by para_first_PEI, which is a symbol level offset, in terms of scheduling flexibility.

[0189] At least one of para_PEI_SS and para_first_PEI is provided to the terminal by network signaling or is determined by parameters for determining a paging search space (eg, pagingSearchSpace and firstPDCCH-MonitoringOccasionOfPO).

[0190] If the value of the search space ID of the para_PEI_SS is 0 (i.e., SearchSpaceID=0), the PDCCH monitoring opportunity for the PEI can follow the method of determining the PDCCH monitoring opportunity for scheduling the RMSI. The method of determining the PDCCH monitoring opportunity for the RMSI may be the method used in conventional (Rel-15 / 16) NR or the method disclosed in 3GPP TS38.213. If this method is used and the wake up indication information carried by one PEI corresponds to only one PO,

[0191] - If only one PO is configured in one PF, only one PEI_O is configured in one PEI_F.

[0192] When two POs are configured in one PF, two PEI_Os are configured in one PEI_F, with the first PEI_O in the first half frame and the second PEI_O in the second half frame. In this case, the order of the PEI_Os in the PEI_F follows the order in which the corresponding POs appear in the PF.

[0193] If the value of the search space ID of para_PEI_SS is not 0 (i.e., SearchSpaceID≠0), PEI_O is composed of a set of S consecutive PDCCH monitoring opportunities. S may mean the number of SSBs actually transmitted, which is set by SIB1. In addition, the K-th PDCCH monitoring opportunity in PEI_O is defined to correspond to the K-th SSB. In this case, the order of the PDCCH monitoring opportunities is sequentially increased from the index of 0 starting from the first PDCCH monitoring opportunity of PEI_F, and this position is defined so as not to overlap with the UL symbol. If this method is used and the activation indication information carried by one PEI corresponds to only one PO,

[0194] - If para_first_PEI is configured, the start position of the PDCCH monitoring opportunity of the (i_s+1)th PEI_O appearing in the PF is defined to correspond to the value of the (i_s+1)th para_first_PEI.

[0195] - If para_first_PEI is not configured, the start position of the PDCCH monitoring opportunity for the (i_s+1)th PEI_O appearing in the PF is set to the i_s*Sth slot.

[0196] At this time, i_s is a parameter indicating the index of the PO within the PF, and follows the method disclosed in 3GPP TS38.304 (for example, Table 5).

[0197] Proposal 3: Collaboration between one PEI and multiple POs

[0198] In order to reduce the resource overhead caused by transmitting PEI, a method of indicating activation information for multiple POs by one PEI (hereinafter, APEI-MPO method) is used. As an example, one PEI includes information on a UE group to which activation information is to be provided among the corresponding PO, and other information other than the information for indicating the UE group may be included in the PEI. We propose a method of determining PEI_F and PEI_O in APEI-MPO.

[0199] Determination of PEI_F for APEI-MPO

[0200] As an example, in the APEI-MPO, a set of POs belonging to the same PF is associated with a PEI. Specifically, when the search space ID for paging is specified as 0, one or two POs are configured in one PF according to parameters set by the base station. In this case, one PEI provides UE group indication information for up to two POs. Also, when the value of the search space ID for paging is not 0, one, two, or four POs are configured in one PF according to parameters set by the base station. In this case, one PEI provides UE group indication information for up to four POs. In this way, all POs associated with the same PEI can belong to the same PF, and the same Offset_F is applied to all POs.

[0201] Alternatively, a set of POs belonging to multiple PFs may be allowed to be associated with a PEI in APEI-MPO. In this way, when one PEI is associated with POs on multiple PFs, PEI_F can be determined / indicated based on a specific PF (hereinafter, PF_S) selected from the associated multiple PFs. As an example, the APEI-MPO method is applied to two (logically) consecutive PFs (e.g., a pair of a first frame corresponding to PF#2n and a second frame corresponding to PF#2n+1 for an arbitrary integer n). In this case, the earlier SFN of the two PFs is PF_S, and PEI_F is indicated / determined by applying Offset_F to PF_S. For example, referring to FIG. 12, it is assumed that APEI-MPO is applied to the 1st PF and the 2nd PF, which are two (logically) consecutive PFs. In other words, it is assumed that one PEI (or one PEI_O) is associated with the PO of the 1st PF and the PO of the 2nd PF. In this case, the 1st PF, which is the earlier SFN of the 1st PF and the 2nd PF, becomes the PF_S. Therefore, the PEI_F is indicated / determined by the Offset_S with the 1st PF, which is the PF_S, as the reference.

[0202] Alternatively, as another method having a similar effect, a different Offset_F is applied to each PF to determine the position of PEI_F so that it can be expected. For example, for two consecutive PFs, a method is used in which the value of Offset_F is applied to the earlier PF, and an additional offset of 10 ms is applied to the previously used Offset_F value to the subsequent PF to match the positions of PEI_F.

[0203] When the APEI-MPO method is allowed for a set of POs belonging to multiple PFs, a certain range constraint can be set as a condition for determining the PFs to be set. As an example, when it is set so that the activation of POs belonging to multiple PFs is instructed by one PEI, the multiple PFs are set so that only PFs within a range of X ms are targeted. As a specific method, when N PFs are structured so that their activation is instructed by one PEI, the PFs are set so that all of them are within a range of X ms based on the position of the earliest PF among the targeted PFs. On the other hand, even if the base station can set the number of PFs, if the set of N PFs does not satisfy the condition of X ms (i.e., if the interval between the first PF and the last PF among the N PFs exceeds the range of X ms), the value of N is set so that it is not instructed by the base station. In this case, the value of X may be a value determined using the SSB periodicity set by the base station, or may be a fixed value (e.g., 80 ms or 160 ms) determined by a standard. This is because the APEI-MPO method is applied, and the interval between the PEI_O and each PO is maintained at a predetermined level for multiple POs that are instructed to start up with the same PEI. If there is no such constraint, the interval between the PEI_O and the PO will be different for each PO, and the interval between the PEI_O and the PO for a specific PO will be set too large, which may reduce the power consumption of a terminal monitoring the PO and significantly increase paging delay.

[0204] Determination of PEI_O for APEI-MPO

[0205] To determine PEI_O in PEI_F, Proposal 2 can be applied.

[0206] For example, a specific method is as follows:

[0207] If the value of the search space ID of the para_PEI_SS is 0 (i.e., SearchSpaceID=0), the PDCCH monitoring opportunity for the PEI is determined by the conventional method of determining the PDCCH monitoring opportunity of the RMSI. The method of determining the PDCCH monitoring opportunity of the RMSI may be the method used in the conventional (Rel-15 / 16) NR, or may be the method disclosed in 3GPP TS38.213. In this case, when this method is used, the APEI-MPO method is applied, and one PEI includes activation indication information for one or more POs, it is determined that only one PEI_O is configured in one PEI_F.

[0208] If the value of the search space ID of para_PEI_SS is not 0 (i.e., SearchSpaceID≠0), PEI_O is composed of a set of S consecutive PDCCH monitoring opportunities. In this case, S may mean the number of SSBs actually transmitted set by SIB1. In addition, the K-th PDCCH monitoring opportunity in PEI_O is determined to correspond to the K-th SSB. In this case, the order of the PDCCH monitoring opportunities is in the order starting from the first PDCCH monitoring opportunity in PEI_F with an index of 0 and increasing sequentially, and this position is determined so as not to overlap with the UL symbol. In this case, when this method is used, the APEI-MPO method is applied, and one PEI includes activation indication information for one or more POs,

[0209] - If para_first_PEI is set, the starting position of the PDCCH monitoring opportunity for PEI_O within the PF is determined by para_first_PEI.

[0210] - If para_first_PEI is not set, the start position of the PDCCH monitoring opportunity for PEI_O within the PF is the first slot.

[0211] Whether or not to apply the APEI-MPO method is separately instructed to the terminal by a higher layer signal (e.g., SIB or RRC signal) transmitted by the base station, in order to allow the base station to decide whether or not to apply the method in consideration of the overhead situation of the network and the power saving gain of the terminal.

[0212] Alternatively, the APEI-MPO method is always applied to POs located in the same PF (or two consecutive PFs) without any other instruction to determine the positions of PEI_F and PEI_O. This has the advantage of not generating additional signaling overhead for specifying APEI-MPO and the advantage of simplifying the operation of the terminal for estimating the receiving position of PEI.

[0213] Proposal 4: PEI_O setting in SS / PBCH block and CORESET multiplexing pattern 1

[0214] When the search space ID for paging is 0, the paging PDCCH monitoring opportunity is determined by a method for determining a PDCCH monitoring opportunity for RMSI. In this case, the PDCCH monitoring opportunity for RMSI may be determined based on a multiplexing pattern between SS / PBCH block and CORESET (hereinafter, mx-pattern) defined in 3GPP standard TS38.213. In this case, if "SS / PBCH block and CORESET multiplexing pattern 1" (hereinafter, mx-pattern-1) is used as the mx-pattern, the PDCCH monitoring opportunity corresponding to each SSB index is defined as a pair at the position of two consecutive slots. Therefore, when mx-pattern-1 is used, the terminal performs PDCCH monitoring in two consecutive slots per PO to monitor a PDCCH monitoring opportunity corresponding to a specific SSB index. This allows the base station to determine the transmission position of the corresponding PDCCH taking into consideration the need to transmit other signals / channels, etc., thereby increasing the scheduling flexibility of the base station, or provides an advantageous effect in improving the reliability of paging reception by allowing the terminal to monitor multiple POs. On the other hand, the terminal needs to monitor the PDCCH twice every DRX cycle even when paging is not actually transmitted, which is disadvantageous in terms of power saving efficiency.

[0215] In the proposed method, information on the location of the PF and / or PO is used to determine the locations of PEI_F and PEI_O. Also, as described above, when the search space ID of the PEI is specified as 0, the PEI also follows the method of determining the PDCCH monitoring opportunity of the RMSI, and in this case, it is necessary to define the method of configuring the PEI_F and PEI_O. In this case, the method proposed in Proposal 1 and Proposal 3 is applied to the location of the PEI_F, as in the case of other multiplexing patterns. When mx-pattern-1 is applied as a method for determining the location of the PO and / or when mx-pattern-1 is applied as a method for determining the location of the PEI, a method of determining the location of the PEI_O is proposed. Specifically, one of the following alternatives is selected and used.

[0216] Alt 4-1: Single PDCCH monitoring occasion

[0217] As one method for determining the position of PEI_O, mx-pattern-1 is applied to determine the position of CORESET0, and it is defined that only one PDCCH monitoring opportunity corresponding to the SSB index is configured at each PEI_O position when one or more of the following conditions are satisfied:

[0218] -If the value of the paging search space ID is 0

[0219] -If the value of the PEI search space ID is 0

[0220] If the base station indicates by separate signaling that only one PDCCH monitoring opportunity corresponding to each SSB index is configured

[0221] At this time, this disclosure does not restrict the operation when the above conditions are not met, which means that in addition to the above conditions, only one PDCCH monitoring opportunity corresponding to the SSB index can be configured at each PEI_O position.

[0222] When this method is used and activation for paging reception is indicated by the PEI, the terminal is determined to follow the conventional (Rel-15 / 16) NR paging procedure. If mx-pattern-1 is applied to determine the location of CORESET0 and the value of the paging search space ID is 0, the PDCCH monitoring opportunities corresponding to each SSB index at the location of the PO consist of two consecutive slots, and the terminal performs paging monitoring in both of the two slots.

[0223] Alternatively, in order to improve the power saving efficiency of the terminal, the PEI DCI includes information specifying the PDCCH monitoring opportunity actually used for transmission among the two slots corresponding to each SSB index configured in the PO. If mx-pattern-1 is applied to determine the position of CORESET0 and the value of the paging search space ID is 0, the PDCCH monitoring opportunity corresponding to each SSB index at the position of the PO is configured with two consecutive slots, and the position of the PDCCH monitoring opportunity actually used among the two slots is indicated to the terminal by the PEI. In this case, there is a power saving gain in that the terminal can omit unnecessary blind detection (BD) operations of the paging PDCCH based on the information from the PEI.

[0224] Alt 4-2: Pair of PDCCH monitoring occasions

[0225] As one of the methods for determining the position of PEI_O, mx-pattern-1 is applied to determine the position of CORESET0, and when any one or more of the following conditions are satisfied, the PDCCH monitoring opportunity corresponding to the SSB index at each PEI_O position follows the configuration of the base station. In this case, if configured by the base station, the PDCCH monitoring opportunity corresponding to the SSB index at each PEI_O position consists of two consecutive slots.

[0226] -If the value of the paging search space ID is 0

[0227] -If the value of the PEI search space ID is 0

[0228] If the base station indicates by separate signaling that the PDCCH monitoring opportunities corresponding to each SSB index are configured at two consecutive slot positions

[0229] When this method is used and the terminal is instructed by the PEI to wake up for paging reception, the terminal follows the conventional (Rel-15 / 16) NR paging procedure. If mx-pattern-1 is applied to determine the location of CORESET0 and the value of the paging search space ID is 0, the PDCCH monitoring opportunities corresponding to each SSB index at the location of the PO consist of two consecutive slots, and the terminal performs paging monitoring in both of the two slots.

[0230] Alternatively, in order to improve the power saving efficiency of the terminal, the PEI DCI includes information specifying the PDCCH monitoring opportunity actually used for transmission among the two slots corresponding to each SSB index configured in the PO. Or, the location information of the two PDCCH monitoring opportunities corresponding to each SSB index configured in the PEI specifies the PDCCH monitoring opportunity actually used for transmission among the two slots corresponding to each SSB index configured in the PO. If mx-pattern-1 is applied to determine the location of CORESET0 and the value of the paging search space ID is 0, the PDCCH monitoring opportunity corresponding to each SSB index at the location of the PO is composed of two consecutive slots, and the location of the PDCCH monitoring opportunity used for implementation among the two slots is indicated to the terminal by the PEI. In this case, there is a power saving gain in that the terminal can omit the BD operation of the unnecessary paging PDCCH according to the information from the PEI.

[0231] FIG. 13 is a diagram for explaining a signal receiving method of a terminal according to an embodiment of the present invention.

[0232] Referring to FIG. 13, the terminal receives configuration information regarding a paging early indication (PEI) (A1305).

[0233] The terminal monitors a first physical downlink control channel (PDCCH) for the PEI based on the configuration information for the PEI (A1310).

[0234] As a result of monitoring the first PDCCH, the terminal monitors a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the detected PEI (A1315).

[0235] The PEI is associated with a PO of one or more paging frames (PFs) among periodic PFs. The terminal monitors a first PDCCH for the PEI based on first offset information and second offset information included in configuration information related to the PEI. The first offset information indicates an interval between a first PF among one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information indicates an interval between a first monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information is frame-level.

[0236] The configuration information regarding the PEI is received by higher layer signaling, which is related to a system information block (SIB).

[0237] The second offset information indicates the interval from the start of the first frame to the start of the first monitoring opportunity of the first PDCCH.

[0238] The PEI is associated with the PO of the first PF and the PO of the second PF among the periodic PFs. The first PF and the second PF are consecutive PFs.

[0239] Multiple PFs associated with a PEI are constrained to be contiguous with each other.

[0240] The granularity of the second offset information is different from the granularity of the first offset information.

[0241] The granularity of the second offset information is the symbol level.

[0242] FIG. 14 is a diagram for explaining a signal transmission method of a base station according to one embodiment of the present invention.

[0243] Referring to FIG. 14, the base station transmits configuration information regarding a paging early indication (PEI) (A1405).

[0244] The base station transmits a first physical downlink control channel (PDCCH) for the PEI based on the configuration information for the PEI (A1410).

[0245] The base station transmits a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI transmitted by the first PDCCH (A1415).

[0246] The PEI is associated with a PO of one or more paging frames (PFs) among periodic PFs. The base station transmits a first PDCCH for the PEI based on first offset information and second offset information included in configuration information related to the PEI. The first offset information indicates an interval between a first PF among one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information indicates an interval between a first monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information is frame-level.

[0247] The configuration information regarding the PEI is transmitted by higher layer signaling, which is related to a system information block (SIB).

[0248] The second offset information indicates the interval from the start of the first frame to the start of the first monitoring opportunity of the first PDCCH.

[0249] The PEI is associated with the PO of the first PF and the PO of the second PF among the periodic PFs. The first PF and the second PF are consecutive PFs.

[0250] Multiple PFs associated with a PEI are constrained to be contiguous with each other.

[0251] The granularity of the second offset information is different from the granularity of the first offset information.

[0252] The granularity of the second offset information is the symbol level.

[0253] FIG. 15 illustrates a communication system 1 to which the present invention is applied.

[0254] Referring to FIG. 15, the communication system 1 applied to the present invention includes wireless devices, base stations, and networks. Here, the wireless devices refer to devices that communicate using wireless connection technology (e.g., 5G NR, LTE), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held Device) 100d, a home appliance 100e, an IoT (Internet of Thing) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication functions, autonomous vehicles, vehicles capable of inter-vehicle communication, and the like. Here, the vehicles include UAVs (Unmanned Aerial Vehicles) (e.g., drones). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital billboards, vehicles, robots, etc. Portable devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebook computers, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0255] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. AI (Artificial Intelligence) technology is applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, the vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, an IoT device (e.g., a sensor) can directly communicate with another IoT device (e.g., a sensor) or another wireless device 100a to 100f.

[0256] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f / base stations 200 and the base stations 200. Here, the wireless communication / connections are performed by various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication) and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and base stations, and the base stations and base stations can transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed according to various proposals of the present invention.

[0257] FIG. 16 illustrates a wireless device to which the present invention can be applied.

[0258] 16, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals according to various wireless access technologies (e.g., LTE, NR), where {first wireless device 100, second wireless device 200} corresponds to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG.

[0259] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate a first information / signal, and then transmits a wireless signal including the first information / signal via the transceiver 106. The processor 102 also receives a wireless signal including a second information / signal via the transceiver 106, and then stores information obtained from signal processing of the second information / signal in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as a radio frequency (RF) unit. In one embodiment of the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0260] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate a third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from the signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In one embodiment of the present invention, the wireless device may also refer to a communication modem / circuit / chip.

[0261] The hardware elements of the wireless device 100, 200 are described in more detail below. One or more protocol layers may be implemented by one or more processors 102, 202, without limitation. For example, the one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions, and / or methods disclosed herein to the one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and derive the PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed herein.

[0262] The one or more processors 102, 202 may also be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, the one or more processors 102, 202 may include 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). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like. The firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202, or may be stored in one or more memories 104, 204 and run by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this specification may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0263] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0264] The one or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, etc., as described in the methods and / or flow charts, etc., herein to one or more other devices. The one or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, suggestions, methods and / or flow charts, etc., disclosed herein from one or more other devices. For example, the one or more transceivers 106, 206 may be coupled to one or more processors 102, 202 and may transmit and receive wireless signals. For example, the one or more processors 102, 202 may control the one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, the one or more processors 102, 202 may control the one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Also, one or more transceivers 106, 206 are coupled to one or more antennas 108, 208, and the one or more transceivers 106, 206 are configured to transmit and receive user data, control information, radio signals / channels, etc., as described, functions, procedures, suggestions, methods, and / or flow charts disclosed herein, via the one or more antennas 108, 208. In this specification, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing by the one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed by the one or more processors 102, 202, from baseband signals to RF band signals. To this end, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0265] 17 shows another example of a wireless device to which the present invention is applied. The wireless device may be embodied in various forms depending on the use case / service (see FIG. 15).

[0266] Referring to Fig. 17, the wireless device 100, 200 corresponds to the wireless device 100, 200 of Fig. 16 and is composed of various elements, components, units / parts and / or modules. For example, the wireless device 100, 200 includes a communication unit 110, a control unit 120, a memory unit 130 and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102, 202 and / or one or more memories 104, 204 in Fig. 16. For example, the transceiver 114 includes one or more transceivers 106, 206 and / or one or more antennas 108, 208 in Fig. 16. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130 and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls electrical / mechanical operations of the wireless device based on the programs / codes / commands / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface, or stores information received from the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0267] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. The wireless device may be embodied in the form of, but not limited to, a robot (FIG. 16, 100a), a vehicle (FIG. 16, 100b-1, 100b-2), an XR device (FIG. 16, 100c), a mobile device (FIG. 16, 100d), a home appliance (FIG. 16, 100e), an IoT device (FIG. 16, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a Fintech device (or a financial device), a security device, a climate / environment device, an AI server / device (FIG. 16, 400), a base station (FIG. 16, 200), and a network node. The wireless device may be mobile or fixed depending on the use case / service.

[0268] In FIG. 17, the various elements, components, units / sections and / or modules within the wireless devices 100, 200 are all coupled to each other by wired interfaces or at least some are wirelessly coupled to each other by a communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and a first unit (e.g., 130, 140) are connected wirelessly via the communication unit 110. In addition, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is composed of a set of one or more processors. For example, the control unit 120 is composed of a set of a communication control processor, an application processor, an ECU (Electronic control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 is composed of 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.

[0269] 18 is a diagram illustrating a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be realized as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0270] 18, a vehicle or autonomous vehicle 100 includes 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 is configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 17, respectively.

[0271] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a causes the vehicle or autonomous vehicle 100 to run on the ground. The driving unit 140a includes an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d embodies a technology for maintaining a lane while driving, a technology for automatically adjusting speed such as an adaptive cruise control, a technology for automatically driving according to a predetermined route, a technology for automatically setting a route when a destination is set, and the like.

[0272] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a drive plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., speed / direction adjustment) so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving route according to the drive plan. The communication unit 110 non-periodically obtains the latest traffic information data from an external server during autonomous driving, and also obtains surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and the drive plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, the autonomous driving route, the drive plan, etc. to the external server. The external server can predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0273] FIG. 19 is a diagram for explaining a DRX (Discontinuous Reception) operation of a terminal according to one embodiment of the present invention.

[0274] A terminal can perform DRX operation while executing the procedures and / or methods described / proposed above. A terminal configured for DRX can reduce power consumption by discontinuously receiving DL signals. DRX is performed in RRC (Radio Resource Control)_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state. DRX in the RRC_IDLE state and RRC_INACTIVE state is used to discontinuously receive paging signals. DRX performed in the RRC_CONNECTED state will be described below (RRC_CONNECTED DRX).

[0275] Referring to FIG. 19, the DRX cycle consists of On Duration and Opportunity for DRX. The DRX cycle defines a time interval during which On Duration is repeated periodically. On Duration indicates a time period during which the terminal monitors to receive the PDCCH. When DRX is configured, the terminal performs PDCCH monitoring during On Duration. If there is a successfully detected PDCCH during PDCCH monitoring, the terminal operates an inactivity timer and maintains an awake state. On the other hand, if there is no successfully detected PDCCH during PDCCH monitoring, the terminal enters a sleep state after the On Duration ends. Thus, when DRX is configured, PDCCH monitoring / reception is performed discontinuously in the time domain when performing the above-described / proposed procedure and / or method. For example, when DRX is configured, in one embodiment of the present invention, PDCCH reception opportunities (e.g., slots having a PDCCH search space) are set discontinuously according to the DRX configuration. On the other hand, if DRX is not configured, when performing the above / proposed procedures and / or methods, PDCCH monitoring / reception is performed continuously in the time domain. For example, in one embodiment of the present invention, if DRX is not configured, PDCCH reception opportunities (e.g., slots having PDCCH search space) are configured continuously. On the other hand, regardless of whether DRX is configured, PDCCH monitoring may be restricted in the time period configured in the measurement gap.

[0276] Table 6 shows the process of the terminal related to DRX (RRC_CONNECTED state). Referring to Table 6, DRX setting information is received via higher layer (e.g., RRC) signaling, and DRX ON / OFF is controlled by a DRX command of the MAC layer. When DRX is set, PDCCH monitoring can be performed discontinuously when performing the procedures and / or methods described / proposed in the present invention.

[0277] [Table 6]

[0278] Here, MAC-CellGroupConfig includes configuration information required to configure MAC (Medium Access Control) parameters for a cell group. MAC-CellGroupConfig may include configuration information related to DRX. For example, MAC-CellGroupConfig includes the following information in the definition of DRX:

[0279] - Value of drx-OnDurationTimer: defines the length of the start period of the DRX cycle

[0280] - Value of drx-InactivityTimer: defines the length of the time period in which the terminal is in an active state after a PDCCH opportunity in which a PDCCH indicating initial UL or DL ​​data is detected

[0281] - Value of drx-HARQ-RTT-TimerDL: Defines the length of the maximum time interval between when a DL initial transmission is received and when a DL retransmission is received.

[0282] - Value of drx-HARQ-RTT-TimerDL: Defines the maximum time interval between when a grant for UL initial transmission is received and when a grant for UL retransmission is received.

[0283] -drx-LongCycleStartOffset: defines the length and start of a DRX cycle

[0284] -drx-ShortCycle(optional): defines the time length of a short DRX cycle

[0285] Here, if any one of the drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is operating, the terminal maintains an active state and performs PDCCH monitoring at every PDCCH opportunity.

[0286] The above-described embodiments are combinations of the components and features of the present invention in a predetermined form. Each component or feature should be considered as optional unless otherwise expressly stated. Each component or feature may be implemented in a form not combined with other components or features. Also, some components and / or features may be combined to form an embodiment of the present invention. The order of each operation described in the embodiments of the present invention may be changed. Some configurations or features of any embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that claims that are not explicitly cited in the claims may be combined to form an embodiment, or may be included as a new claim by amendment after filing.

[0287] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be interpreted as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention. [Industrial Applicability]

[0288] The present invention can be used in a terminal, a base station or other equipment of a wireless mobile communication system.

Claims

1. A method performed by a terminal, comprising: receiving configuration information regarding a paging early indication (PEI); monitoring a first physical downlink control channel (PDCCH) for the PEI based on configuration information for the PEI; monitoring a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI detected as a result of monitoring the first PDCCH; The PEI is associated with POs of a plurality of consecutive paging frames (PFs), The terminal monitors the first PDCCH for the PEI based on first offset information and second offset information included in configuration information regarding the PEI; For the plurality of PFs, the first offset information indicates an interval between a first PF among the plurality of PFs associated with the PEI and a first frame including a monitoring opportunity for the first PDCCH; The second offset information indicates an interval between a first monitoring opportunity among monitoring opportunities for the first PDCCH and a start of the first frame, A method, wherein the granularity of the first offset information is frame-level.

2. The method of claim 1 , wherein the configuration information regarding the PEI is received by higher layer signaling.

3. The method of claim 2 , wherein the higher layer signaling is associated with a system information block (SIB).

4. The method of claim 1 , wherein the second offset information indicates an interval from a start of the first frame to a start of a leading monitoring opportunity of the first PDCCH.

5. The method of claim 1 , wherein a granularity of the second offset information is different from a granularity of the first offset information.

6. The method of claim 1 , wherein the granularity of the second offset information is symbol-level.

7. A computer-readable recording medium having recorded thereon a program for executing the method according to claim 1.

8. A device comprising: A memory for storing instruction words; A processor that operates by executing the instructions; The operation of the processor includes receiving configuration information related to a paging early indication (PEI), monitoring a first physical downlink control channel (PDCCH) for the PEI based on the configuration information related to the PEI, and monitoring a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI detected as a result of monitoring the first PDCCH; The PEI is associated with POs of a plurality of consecutive paging frames (PFs), The processor is configured to monitor the first PDCCH for the PEI based on first offset information and second offset information included in configuration information related to the PEI; For the plurality of PFs, the first offset information indicates an interval between a first PF among the plurality of PFs associated with the PEI and a first frame including a monitoring opportunity for the first PDCCH; The second offset information indicates an interval between a first monitoring opportunity among monitoring opportunities for the first PDCCH and a start of the first frame, A device, wherein the granularity of the first offset information is frame-level.

9. The device of claim 8 , further comprising a transceiver for transmitting or receiving wireless signals under control of the processor.

10. The device of claim 8 , wherein the device is a terminal (UE) operating in a wireless communication system.

11. 9. The device of claim 8, wherein the device is an application specific integrated circuit (ASIC) or a digital signal processor configured to control a terminal (UE) operating in a wireless communication system.

12. 1. A method performed by a base station, comprising: sending configuration information regarding a paging early indication (PEI); transmitting a first physical downlink control channel (PDCCH) for the PEI based on configuration information regarding the PEI; transmitting a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI transmitted by the first PDCCH; The PEI is associated with POs of a plurality of consecutive paging frames (PFs), The base station transmits the first PDCCH for the PEI based on first offset information and second offset information included in configuration information regarding the PEI; For the plurality of PFs, the first offset information indicates an interval between a first PF among the plurality of PFs associated with the PEI and a first frame including a monitoring opportunity for the first PDCCH; The second offset information indicates an interval between a first monitoring opportunity among monitoring opportunities for the first PDCCH and a start of the first frame, A method, wherein the granularity of the first offset information is frame-level.

13. A base station, A memory for storing instruction words; A processor that operates by executing the instructions; The operations of the processor include: transmitting configuration information related to a paging early indication (PEI); transmitting a first physical downlink control channel (PDCCH) for the PEI based on the configuration information related to the PEI; and transmitting a second PDCCH for scheduling a paging message based on a paging occasion (PO) associated with the PEI transmitted by the first PDCCH; The PEI is associated with POs of a plurality of consecutive paging frames (PFs), The processor is configured to transmit the first PDCCH for the PEI based on first offset information and second offset information included in configuration information related to the PEI; For the plurality of PFs, the first offset information indicates an interval between a first PF among the plurality of PFs associated with the PEI and a first frame including a monitoring opportunity for the first PDCCH; The second offset information indicates an interval between a first monitoring opportunity among monitoring opportunities for the first PDCCH and a start of the first frame, A base station, wherein the granularity of the first offset information is a frame-level.

Images