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

Abstract

A terminal according to the present invention receives information regarding a PEI (paging early indication) DCI payload size "N" through hierarchical signaling, determines a size "M" of all information bits of the PEI DCI including a first information bit related to paging and a second information bit related to TRS (tracking reference signal) availability in an RRC idle / inactive state, and determines "N"-"M" reserved bits.

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 on a paging early indication (PEI) through higher layer signaling, monitoring a first PDCCH carrying downlink control information (DCI) in a format for the PEI in a radio resource control (RRC) idle or RRC inactive state based on the configuration information on the PEI, and monitoring a second PDCCH for paging in a paging occasion (PO) associated with the PEI based on detection of the DCI in the format for the PEI. The configuration information on the PEI includes information on a payload size "N" of the DCI in the format for the PEI. The DCI in the format for the PEI includes first information bits related to paging and second information bits related to tracking reference signal (TRS) availability in an RRC idle or RRC inactive state. A size "M" of all information bits of the DCI in the format for the PEI including the first information bits and the second information bits does not exceed the DCI payload size "N". The terminal assumes "N"-"M" reserved bits based on the DCI payload size "N" and the total information bit size "M" included in the configuration information for the PEI, and detects the DCI in the format for the PEI.

[0006] The size of the reserved bits "N"-"M" is a variable determined based on the size of the total information bits "M" determined by the terminal and the DCI payload size "N" set in the terminal by higher layer signaling.

[0007] A cyclic redundancy check (CRC) of the first PDCCH is scrambled with a radio network temporary identifier (PEI-RNTI). The terminal monitors the first PDCCH based on the PEI-RNTI in a common search space (CSS) set.

[0008] The DCI in the format for the PEI is common to one or more terminals including the terminals mentioned above.

[0009] The first PDCCH carrying DCI in the format for PEI is monitored only when the terminal is in an RRC idle state or when the terminal is in an RRC inactive state. In an RRC connected state, the terminal stops monitoring the first PDCCH carrying DCI in the format for PEI.

[0010] The higher layer signaling is associated with a system information block (SIB).

[0011] The configuration information regarding the PEI includes information related to a size of the first information bit and information related to a size of the second information bit.

[0012] In another aspect of the present invention, there is provided a computer-readable recording medium having recorded thereon a program 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 related to a paging early indication (PEI) by higher layer signaling, transmitting a first PDCCH carrying downlink control information (DCI) in a format for the PEI in a radio resource control (RRC) idle or RRC inactive state of the terminal based on the configuration information related to the PEI, and transmitting a second PDCCH for paging in a paging occasion (PO) associated with the PEI based on the DCI in the format for the PEI. The configuration information related to the PEI includes information on a DCI payload size "N" in the format for the PEI. The DCI in the format for the PEI includes first information bits related to paging and second information bits related to tracking reference signal (TRS) availability in an RRC idle or RRC inactive state. A size "M" of all information bits of the DCI in the format for the PEI including the first information bits and the second information bits does not exceed the DCI payload size "N". The base station sets "N"-"M" reserved bits based on the DCI payload size "N" and the total information bit size "M" included in the configuration information for the PEI.

[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, since the size of the reserved bits of the DCI format for the PEI can be configured, it has an advantage of being forward compatible with terminals to which new functions will be added in the future, and even if the terminal does not support the new function, the overhead of blind detection for the DCI does not increase, which is advantageous for power saving.

[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.

[0020] [Diagram 2] FIG. 2 illustrates an example of a radio frame structure.

[0021] [Diagram 3] FIG. 2 illustrates a resource grid of slots.

[0022] [Figure 4] A diagram showing an example of mapping physical channels within a slot.

[0023] [Diagram 5] A diagram illustrating the transmission and reception process of a PDCCH (Physical Downlink Control Channel).

[0024] [Figure 6] 1 is a diagram illustrating a PDSCH reception and ACK / NACK transmission process.

[0025] [Figure 7] FIG. 2 illustrates a PUSCH transmission process.

[0026] [Figure 8] FIG. 1 is a diagram showing an LTE-based wakeup signal.

[0027] [Figure 9-10] 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;

[0028] [Figure 11] A diagram to explain a DCI format for PEI according to one embodiment of the present invention.

[0029] [Figure 12] 2 is a diagram illustrating a signal receiving method of a terminal according to an embodiment of the present invention.

[0030] [Figure 13] 2 is a diagram illustrating a signal transmission method of a base station according to one embodiment of the present invention.

[0031] [Figure 14-17] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention.

[0032] [Figure 18] 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

[0033] 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.

[0034] 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.

[0035] For clarity of explanation, 3GPP NR will be mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0036] For background, terms, definitions, abbreviations, and the like related to this invention, the following documents may be referred to (Incorporated by Reference):

[0037] 3GPP LTE

[0038] -TS36.211:Physical channels and modulation

[0039] -TS36.212:Multiplexing and channel coding

[0040] -TS36.213:Physical layer procedures

[0041] -TS36.300:Overall description

[0042] -TS36.321:Medium Access Control(MAC)

[0043] -TS36.331:Radio Resource Control(RRC)

[0044] 3GPP NR

[0045] -TS38.211:Physical channels and modulation

[0046] -TS38.212:Multiplexing and channel coding

[0047] -TS38.213:Physical layer procedures for control

[0048] -TS38.214:Physical layer procedures for data

[0049] -TS38.300:NR and NG-RAN Overall Description

[0050] -TS38.321:Medium Access Control(MAC)

[0051] -TS38.331:Radio Resource Control(RRC) protocol specification

[0052] -TS37.213:Introduction of channel access procedures to unlicensed spectrum for NR-based access

[0053] Terms and Abbreviations

[0054] -PSS:Primary Synchronization Signal

[0055] -SSS:Secondary Synchronization Signal

[0056] -CRS: Cell reference signal

[0057] -CSI-RS:Channel State Information Reference Signal

[0058] -TRS:Tracking Reference Signal

[0059] -SS: Search Space

[0060] -CSS: Common Search Space

[0061] -USS:UE-specific Search Space

[0062] -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.).

[0063] -PO: Paging Occasion

[0064] -MO:Monitoring Occasion

[0065] -RMSI: Remaining Minimum Signal Integrity

[0066] -BD: Blind Decoding

[0067] -DCI:Downlink Control Information

[0068] - 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.

[0069] 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.

[0070] FIG. 1 is a diagram illustrating physical channels used in a 3GPP NR system and a general signal transmission method using these channels.

[0071] A terminal that is powered on from a power-off state or that newly enters 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.

[0072] 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.

[0073] 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).

[0074] 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.

[0075] 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.

[0076] 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.

[0077] [Table 1]

[0078] *N slot symb :Number of symbols in the slot

[0079] *N frame,u slot : Number of slots in the frame

[0080] *N subframe,u slot : Number of slots in a subframe

[0081] 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.

[0082] [Table 2]

[0083] The frame structure is exemplary only, and the number of subframes, slots, and symbols within a frame can vary.

[0084] 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).

[0085] 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.

[0086] 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.

[0087] 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).

[0088] FIG. 5 is a diagram illustrating a PDCCH transmission / reception process.

[0089] 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:

[0090] -controlResourceSetId: Indicates the ID of the CORESET.

[0091] -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.

[0092] -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.

[0093] -cce-REG-MappingType: Indicates the mapping type between CCE (Control Channel Element) and REG. Interleaved and non-interleaved types are supported.

[0094] -interleaverSize: Indicates the interleaver size.

[0095] -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.

[0096] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0097] -reg-BundleSize: Indicates the REG bundle size.

[0098] -tci-PresentInDCI: Indicates whether the TCI (Transmission Configuration Index) field is included in the DL-related DCI.

[0099] -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).

[0100] 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.

[0101] 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.

[0102] 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:

[0103] -searchSpaceId: Indicates the ID of the SS.

[0104] -controlResourceSetId: Indicates the CORESET related to the SS.

[0105] -monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring periodicity interval (in slot units) and the PDCCH monitoring period offset (in slot units).

[0106] - 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.

[0107] -nrofCandidates: indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8) for AL={1, 2, 4, 8, 16}.

[0108] -searchSpaceType: Indicates CSS (Common Search Space) or USS (UE-specific search space), and indicates the DCI format used for the corresponding SS type.

[0109] 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.

[0110] Table 3 illustrates the characteristics of each SS type.

[0111] [Table 3]

[0112] Table 4 illustrates an example of a DCI format transmitted via the PDCCH.

[0113] [Table 4]

[0114] 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.

[0115] 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.

[0116] 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.

[0117] - 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.

[0118] -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.

[0119] 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:

[0120] -Frequency domain resource assignment: Indicates the RB set assigned to the PDSCH.

[0121] 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).

[0122] -PDSCH-to-HARQ_feedback timing indicator: Indicates K1.

[0123] -HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB).

[0124] - PUCCH resource indicator (PRI): indicates a PUCCH resource to be used for UCI transmission among multiple PUCCH resources in a PUCCH resource set.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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:

[0133] -Frequency domain resource assignment: Indicates the RB set assigned to the PUSCH.

[0134] -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.

[0135] 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.

[0136] Paging

[0137] 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 UEs in 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.

[0138] 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:

[0139] 1) In the case of CN-initiated paging, the basic period is broadcast by the system information.

[0140] 2) In the case of CN-initiated paging, the UE-specific periodicity is set by NAS signaling.

[0141] 3) In case of RAN-initiated paging, a UE-specific periodicity is set by RRC signaling.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] The PF and PO for paging are determined as follows:

[0149] - Determination of SFN for PF:

[0150] (SFN+PF_offset) mod T=(T div N)*(UE_ID mod N)

[0151] -Determining the index (i_s) indicating the index of the PO:

[0152] i_s = floor(UE_ID / N) mod Ns

[0153] The following parameters are used in the calculation of PF and i_s:

[0154] -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)

[0155] -N:T is the number of total paging frames

[0156] -Ns: Number of POs in PF

[0157] -PF_offset: The offset used to determine the PF

[0158] -UE_ID: 5G-S-TMSI mode 1024

[0159] WUS(Wake-up signal) / PEI(Paging Early Indication)

[0160] In LTE Rel-15 NB-IoT and MTC, a wake-up signal (WUS) was introduced to save power for terminals. 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 can expect that paging will be transmitted at the corresponding PO. If it cannot detect a WUS at the WUS transmission location, it can obtain power saving gain by not expecting paging at the corresponding PO. 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 reducing unnecessary wake-ups of the terminal by using a WUS transmission location and sequence determined based on the terminal-group ID of the terminal.

[0161] 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).

[0162] In a communication system such as NR, whether the UE monitors or provides a 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.

[0163] DCI design for reduced Blind Decoding complexity

[0164] 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 by the P-RNTI, it performs an operation instructed by the DCI.

[0165] 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.

[0166] In Rel-16 NR, a DCI-based power saving method 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.

[0167] As discussed in Rel-16 NB-IoT and MTC, when monitoring the PO of a terminal in idle / dormant mode, unnecessary wake-up may occur if paging is transmitted for other terminals sharing the same PO, 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 / inactive 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 terminals in idle / inactive mode can expect are being discussed.

[0168] DCI is used for such various types of information. That is, PDCCH-based PEI transmission is suitable. In general, providing more paging information is easier to control various power saving operations of the terminal. However, considering the decoding reliability of the PDCCH, an increase in the amount of information may require more accurate time / frequency tracking before the terminal can decode the PDCCH, which may lead to an increase in power consumption caused by the terminal monitoring the SSB. Therefore, when introducing the PDCCH-based PEI, it is important to appropriately determine the amount of information of the PEI in consideration of power saving efficiency. As an example, a method of reducing the number of bits constituting the DCI, i.e., a method of introducing a new DCI format, may be considered to improve the performance of PDCCH decoding.

[0169] Another aspect to consider when designing a PDCCH-based PEI is the increase in the complexity of the terminal. In the case of a conventional NR terminal, in an idle / inactive state, it is expected to receive DCI formats 0_0 and 1_0. The purpose and information of this DCI format are distinguished according to various RNTI values ​​used for CRC scrambling. In this case, even if search spaces for different purposes are overlapped, the terminal can perform BD for the same size DCI format without further complexity (or only very low complexity is further generated). However, if a new DCI format is introduced to support the PDCCH-based PEI and the size of the DCI format is different from DCI format 0_0 / 1_0, the terminal receiving the PEI needs further complexity to BD the new size DCI. At this time, it should be noted that an increase in the BD of the terminal may significantly increase the power consumption of the terminal. In addition, for a terminal in connected mode, it is necessary to consider that there is a restriction on the number of BD and channel estimation for the maximum number of PDCCH candidates that can be performed per slot. If a DCI format with a new size is added, this may limit the monitoring of the existing DCI format and RNTI.

[0170] The above problem is not limited to PDCCH-based PEI, but also occurs in other general cases. In other words, the proposal of the present invention is applicable to a situation where the overhead of BD / channel estimation of a terminal increases due to the addition of a new function of providing information based on PDCCH.

[0171] We design a PDCCH-based PEI and propose a UE operation method for monitoring it. The proposed method can provide advantageous effects by maintaining the decoding complexity of the UE and improving power saving efficiency.

[0172] The following description will be given as 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.

[0173] FIG. 9 illustrates the operation of a base station to which the method according to the invention can be applied.

[0174] The base station generates and transmits configuration information related to the PEI (FC101). The configuration information includes configuration information related to the DCI format and monitoring position of the PEI. As an example, the configuration information is transmitted using higher layer signaling (e.g., SIB or RRC signaling).

[0175] 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 and slot position, based on the configuration information provided in step FC 101 (FC 102). At this time, the base station performs a DCI size alignment operation as necessary.

[0176] 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).

[0177] FIG. 10 illustrates the operation of a terminal to which the method according to the invention can be applied.

[0178] The terminal receives configuration information related to the PEI and applies it (FC201). At this time, the configuration information includes configuration information related to the DCI format and monitoring position of the PEI. As an example, in order to receive the configuration information, a procedure for acquiring a higher layer signal (e.g., SIB or RRC signaling) is performed.

[0179] Thereafter, the terminal performs a PEI monitoring operation at a position where the PEI can be expected to be received, for example, a frame and slot position, based on the configuration information received in step FC201 (FC202). The terminal determines a decoding method of the DCI format at the monitoring position based on the configuration information.

[0180] 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).

[0181] Proposal 1: DCI size alignment with freeze / fill bits

[0182] When the number of blind detection (BD) increases in the process of the UE monitoring the PDCCH, power consumption increases. In order to reduce the UE's power consumption and complexity, NR limits the number of PDCCH candidates that the UE simultaneously BDs. In order to minimize the constraints on PDCCH transmission and reception by restricting the number of PDCCH candidates that can be BDs, a method of configuring different DCI formats with the same size is used.

[0183] In the present invention, a method for reducing BD complexity of a terminal when PDCCH signaling (DCI) for supporting a new function is added is proposed. The proposed method is suitable for the purpose of ensuring PDCCH decoding performance and / or not increasing BD complexity of a terminal when a new function based on PDCCH is added in an idle / inactive mode and the size of information provided by the PDCCH is relatively small compared to the amount of information of other PDCCHs.

[0184] In this invention, it is assumed that the number of bits constituting a specific reference DCI format (hereinafter, DF-ref) is N. In this case, if a base station wishes to transmit M-bit information (hereinafter, info-A) that is an integer smaller than N via a PDCCH, the base station transmits M-bit info-A based on N, which is the size of the DF-ref. In this case, scrambling using a specific RNTI (hereinafter, RNTI-A) is applied to CRC in order to distinguish the DF-ref for transmitting Info-A from information transmission for other purposes.

[0185] Specifying the frozen bit

[0186] As one method for transmitting Info-A, the use of DF-ref is considered. In this way, in order to transmit information of M bit size by a DF-ref of a larger number of N bits, a method is proposed in which the remaining NM bits not used by the terminal are assumed to be frozen bits. In this case, the frozen bits are bits whose bit state is assumed by the base station and the terminal to have a fixed value according to a predetermined rule, and the frozen bits are determined regardless of the remaining information of M bit size. As an example, the frozen bits can assume that all bits are always fixed to a value of 0 (or 1), and this proposal is used even if the frozen bits have other values ​​(e.g., a specific bit pattern) as long as the base station and the terminal follow a predetermined rule. Specifically, the positions of the frozen bits and M information bits of the NM bits are determined according to a predetermined rule in the DF-ref.

[0187] The base station notifies the terminal of configuration information regarding DF-ref and configuration information regarding info-A, and the configuration information includes the type and size of information. The terminal receives the configuration information of DF-ref and info-A transmitted by the base station, and applies Proposal 1 accordingly. In this case, the configuration information may be transmitted and received using higher layer signaling (e.g., SIB or RRC signaling), and may be used together with an adaptive control method using DCI or MAC. The configuration information regarding DF-ref may refer to a signal provided for PDCCH transmission and reception for other purposes, instead of being provided separately only for the purpose of Proposal 1.

[0188] After transmitting the configuration information, the base station generates a PDCCH including info-A and transmits it at a predetermined position in the search space. At this time, the base station generates DCI based on DF-ref and maps the frozen bit and info-A to a predetermined bit position. After receiving the configuration information, the terminal performs BD for PDCCH candidates at a predetermined position in the search space based on the configuration information, and at this time, performs decoding taking into account the frozen bit and the predetermined bit position of info-A when receiving DF-ref.

[0189] Table 5 is an example of the above proposal, and indicates that DCI format 1_0 is used as DF-ref and transmission of info-A is supported by RNTI-A. Frozen bit field is a bit field that the terminal assumes a value of 0, Information_1 and Information_2 are information included in Info-A, and N F , N 1 , and N 2 Each of the numbers means the number of bits. However, the present invention is not limited to the terms and structures used in the following examples.

[0190] [Table 5]

[0191] Inserting padding bits

[0192] Another method that can achieve the same effect as the above-mentioned frozen bit designation is to use a different DCI format for transmitting Info-A (hereinafter referred to as DF-new) and add padding bits to match the size of DF-ref. The proposed method is applied when DF-new used to transmit Info-A of M bit size is transmitted and received on a common search space (CSS), DF-ref of N bit size, which is an integer larger than M, is transmitted and received on a CSS on the same serving cell, and the UE needs to monitor both, in which case a zero padding bit of NM bit size is added to DF-new to match the size of DF-new and DF-ref.

[0193] For this purpose, the base station notifies the terminal of configuration information related to DF-ref and configuration information related to info-A included in DF-new, and this configuration information includes the type and size of information. The terminal receives the configuration information of DF-ref and info-A included in DF-new transmitted by the base station, and applies Proposal 1 accordingly. At this time, the configuration information may be transmitted and received using higher layer signaling (e.g., SIB or RRC signaling), and an adaptive control method using DCI or MAC may also be used together. At this time, the configuration information related to DF-ref is not provided separately only for the purpose of Proposal 1, but may refer to a signal provided for PDCCH transmission and reception for other purposes.

[0194] After transmitting the configuration information, if there is info-A to be transmitted, the base station generates a PDCCH including the info-A and transmits it at a predetermined search space position. At this time, the base station generates DCI based on DF-new and maps info-A to a predetermined bit position. At this time, if the size of DF-new is smaller than the size of DF-ref, zero padding bits are mapped to match the size of DF-new to DF-ref. After receiving the configuration information, the terminal performs BD for PDCCH candidates at a position of the search space determined based on the received information, and at this time, in receiving DF-new, decoding is performed taking into account zero padding and the predetermined bit position of info-A.

[0195] Table 6 is an example of the above proposal, and shows that DCI format 2_X is used as DF-ref and RNTI-A instructs transmission of info-A. In the example of Table 6, Information_1 and Information_2 are information included in Info-A, Padding bits are fields where zero padding is inserted, and N 1 and N 2 means the number of bits of each. However, the present invention is not limited to the terms and structures used in the following examples.

[0196] [Table 6]

[0197] In order not to increase the PDCCH decoding complexity of the terminal, when Proposal 1 is used, the DF-ref is selected as the DCI format that has been used conventionally (or is used in the general case). As an example, in NR, DCI format 0_0 / 1_0 defined in the 3GPP TS 38.212 standard, which can be expected to be commonly received by terminals in all states, is used as the DF-ref.

[0198] For example, when Proposal 1 is applied to PDCCH-based PEI, the DCI for PEI is designed based on the size of DCI format 1_0. Also, the size of information transmitted and received by PEI is M 1 and the size of DCI format 1_0 is N 1 When M 1 <N 1 It is.

[0199] When the above-mentioned frozen bits are used, the PDCCH for the PEI is generated using DCI format 1_0 in which the CRC is scrambled with the PEI-RNTI. In this case, the base station and the terminal use N bits of the DCI format 1_0 for transmitting and receiving the PDCCH-based PEI. 1 -M 1 Assume that the bit is set as a frozen bit having a value of 0. For this purpose, the base station 1 Report the size to the device.

[0200] When the above-mentioned padding bit insertion method is used, a new DCI format for the PEI is defined (hereinafter, DCI format 2_P), and the PDCCH for the PEI is generated using DCI format 2_P in which the CRC is scrambled with the PEI-RNTI. In this case, when the PEI is transmitted and received on a CSS, the base station and the terminal assume that zero padding bits are inserted to match the size of DCI format 2_P to the size of DCI format 1_0 transmitted and received on another CSS in the same cell in which the CSS is transmitted. For this purpose, the base station inserts zero padding bits into the M transmitted by the PEI. 1 Report the size to the device.

[0201] When Proposal 1 is applied to the PEI, there is an advantage that there is no increase in complexity due to BD when the UE receives the PDCCH in addition to the PEI. This is because when the UE monitors multiple DCI formats that share a CORESET, such as the same starting OFDM symbol, the multiple DCI formats can be distinguished by only checking each masked RNTI without performing further BD. In particular, when the PEI provides information useful for improving power saving, such as an indication of TRS / CSI-RS availability, the UE has the advantage that it can check the PEI as needed without incurring further complexity even when it is not a PEI monitoring opportunity for the UE.

[0202] Meanwhile, when the terminal attempts to monitor the PDCCH for the PEI, the terminal can perform channel decoding based on the information size of the PEI, not based on DCI format 1_0, by assuming the positions and states of bits used as frozen bits and / or zero-filling bits, which can be expected to improve effective coding gain and decoding reliability. This affects the time / frequency accuracy required before the terminal monitors the PDCCH-based PEI, and as a result, it can increase power saving gain by allowing the terminal to monitor a smaller number of SSBs.

[0203] Proposal 2: Add reserved bit fields

[0204] In some DCI formats, in addition to a bit field (hereinafter, info-bit-field) that provides necessary information to terminals, a reserved bit field (hereinafter, rsv-bit-field) (terminals under certain conditions do not assume meaningful information) is also included. One of the main purposes of the rsv-bit-field is to ensure coexistence, i.e., forward compatibility, with existing terminals that do not have new capabilities and information processing capabilities when they are introduced. Specifically, the method of ensuring forward compatibility using the rsv-bit-field is useful for DCI formats on a search space that is monitored by an unspecified number of terminals, such as CSS. As an example, in NR, in the case of DCI format 1_0 in which the CRC is scrambled with the P-RNTI, many terminals transmit and receive in common, and 6 or 8 reserved bits are defined based on the TS 38.212 standard of Rel-16. On the other hand, the reserved bits are different from the zero-filled bits and frozen bits in that the terminals cannot assume the state value of the bits. Therefore, when the DCI format to be decoded contains reserved bits, the terminal must perform the channel decoding process in the same way as for normal information, which means that an increase in reserved bits affects the decrease in coding gain.As an example, we propose a method that supports forward compatibility using the rsv-bit field while improving coding gain according to the base station's decision.

[0205] This example shows a situation where the size of specific information to be transmitted (hereinafter, info-B) is L bits. In this case, when info-B is to be transmitted by the PDCCH, a specific DCI format (hereinafter, DF-add) of N bits is used, and the DF-add includes both info-B and a reserved bit field of R bits instructed by the base station.

[0206] Setting rsv-bit-field without considering DCI size alignment

[0207] When DCI-add is used to transmit Info-B, an rsv-bit-field is configured in DCI-add. As an example, whether to configure the rsv-bit-field and its size are set by the base station. Specifically, when the base station configures at least one of L-bit info-B and / or R-bit rsv-bit-field and notifies the terminal, the terminal assumes that N=L+R, which is the number of bits configuring DCI-add.

[0208] For this purpose, the base station notifies the terminal of configuration information related to info-B included in DF-add, and the configuration information includes the type and size of information. In addition, the base station determines the number of bits of rsv-bit-field included in DF-add in which info-B is transmitted to the terminal, and notifies the terminal of configuration information including the number of bits. The terminal receives the configuration information of info-B and rsv-bit-field included in DF-add transmitted by the base station, and operates based on proposal 2 accordingly. At this time, the configuration information is transmitted and received using higher layer signaling (e.g., SIB or RRC signaling), and an adaptive control method using DCI or MAC may be used together. The configuration information related to info-B and rsv-bit-field differs depending on the function supported by the terminal or the capability of the terminal. For example, the base station provides the terminal with information on a release or capability supported by the terminal by dividing each detailed information constituting info-B into the information on each release or capability supported by the terminal, or provides the information on the rsv-bit-field by explicitly dividing it according to the information on each release or capability supported by the terminal, or it is implicitly estimated based on other information. The terminal receives the configuration information transmitted by the base station, selects applicable configuration information based on the functions and capabilities supported by the terminal, and performs an operation related thereto.

[0209] After transmitting the configuration information, the base station generates a PDCCH including info-B and transmits it at a predetermined search space position. At this time, the base station generates DCI based on DF-add and maps info-B and, if necessary, rsv-bit-field to a predetermined bit position. If rsv-bit-field needs to be configured in DF-add, the state of the bits configuring the corresponding field is arbitrarily selected by the base station. After receiving the configuration information, the terminal performs BD for PDCCH candidates at a predetermined search space position based on the received information, and at this time, when receiving DF-add, performs decoding taking into account the predetermined bit position and size of info-B and rsv-bit-field.

[0210] The RNTI value available for CRC scrambling of DCI-add may be, but is not limited to, a separately specified RNTI value or an RNTI value used for other purposes.

[0211] Table 7 is an example of the above proposal, and indicates that DCI format 2_X is used as DF-add and that the transmission of info-B is instructed by RNTI-A. Information_1 and Information_2 are information included in Info-B, reserved bits are rsv-bit-fields explicitly instructed by the base station, and N 1 and N 2 , N R means the number of bits of each. In this case, Information_2 means information that is supported or not determined according to the capability of the terminal, and if the terminal does not support this, it shows an example of a bit field that can be assumed as a reserved bit. The following examples are provided to explain the principles of the invention and are not limited thereto.

[0212] [Table 7]

[0213] Setting rsv-bit-field considering DCI size alignment

[0214] Alternatively, as in Proposal 1, ref When a method of adjusting the size of DCI based on DCI-ref having a size of 128 bits is applied to DCI-add, DCI-add includes L bits constituting info-B and R bits constituting rsv-bit-field, and the remaining N ref -(L+R)bit is applied as frozen bit and / or zero-fill bit. The definition and application method of frozen bit and zero-fill bit follow Proposal 1. Specifically, info-A in Proposal 1 corresponds to the concept including both info-B and rsv-bit-field in Proposal 2.

[0215] For this purpose, the base station notifies the terminal of configuration information regarding DF-ref and DF-add, and this configuration information includes the type and size of the information.

[0216] In addition, the base station determines the number of bits of rsv-bit-field included in DF-add in which info-B is transmitted to the terminal, and notifies the terminal of configuration information including the number of bits. In this case, the configuration information on the rsv-bit-field directly indicates the size of the rsv-bit-field, or indicates information required for the terminal to estimate the size of the rsv-bit-field (e.g., the size of the frozen bit or zero-filling bit applied to DCI-add). The terminal receives the configuration information of info-B and rsv-bit-field included in DF-add transmitted by the base station, and operates based on a combination of proposal 1 and proposal 2 accordingly. The configuration information may be transmitted and received using higher layer signaling (e.g., SIB or RRC signaling), and an adaptive control method using DCI or MAC may be used together. The configuration information on info-B and rsv-bit-field varies depending on the functions supported by the terminal or the capabilities of the terminal. For example, the base station provides each detailed information constituting info-B to the terminal by classifying it into release information or capability information supported by the terminal, and information in the rsv-bit-field is explicitly classified and provided for each release information or capability information supported by the terminal, or is implicitly estimated based on other information. In this case, the terminal receives the configuration information transmitted by the base station, and selects applicable configuration information based on the functions and capabilities supported by the terminal to perform related operations. Meanwhile, the bit field designated as the frozen bit or the zero-filled bit is set to the same in the same cell (or BWP or CORESET) regardless of the release or capability supported by the terminal.

[0217] After transmitting the configuration information, the base station generates a PDCCH including info-B and transmits it at a position in a determined search space. At this time, the base station generates DCI based on the DF-add to which the frozen bit designation and / or padding bit insertion method is applied, and maps info-B and, if necessary, rsv-bit-field to a determined bit position. In addition, the remaining bits not determined for info-B and rsv-bit-field are used as frozen bits and / or zero padding bits. At this time, if the rsv-bit-field needs to be configured in the DF-add, the state of the bits configuring the field is arbitrarily selected by the base station. After receiving the configuration information, the terminal performs BD for PDCCH candidates at a position in the search space determined based on the received information, and at this time, in receiving the DF-add, performs decoding taking into account the determined bit positions and sizes of info-B and rsv-bit-field.

[0218] The RNTI value used for CRC scrambling of DCI-add is RNTI-A (i.e., an RNTI distinct from RNTIs for other purposes) as in Proposal 1. This is to distinguish DCI-ref and DCI-add, which have the same size, from each other.

[0219] Table 8 shows an example of the above-mentioned proposal, in which DCI format 2_X is used as DF-add, RNTI-A instructs transmission of info-B, and zero padding bits are added to match the size with DCI format 1_0. Information_1 and Information_2 refer to information included in Info-B, Padding bits refer to a field where zero padding is inserted, Reserved bits refer to the rsv-bit-field explicitly instructed by the base station, and N 1 and N 2 , N Rmeans the number of bits of each. Information_2 means information that is supported or not depending on the terminal's capabilities, and indicates an example of a bit field that can be assumed as a reserved bit if the terminal does not support it. The present invention is not limited to the terms and structures used in the examples.

[0220] [Table 8]

[0221] In order to ensure forward compatibility of DCI and not increase the PDCCH decoding complexity of the terminal, when Proposal 1 and Proposal 2 are used in combination, DF-ref is selected as the DCI format that has been used conventionally (or is used in general cases). As an example, in NR, DCI format 0_0 / 1_0 defined in the 3GPP TS 38.212 standard, which can be expected to be commonly received by terminals in all states, is used for DF-ref.

[0222] As an example, when the configuration of the rsv-bit-field that does not consider the above-mentioned DCI size alignment is used, a new DCI format for the PEI is defined (hereinafter, DCI format 2_Q), and the PDCCH for the PEI is generated using DCI format 2_Q in which the CRC is scrambled with the PEI-RNTI. In this case, the DCI format 2_Q in which the CRC is scrambled with the PEI-RNTI includes a field for transmitting PEI information, and also includes a reserved bit field that is determined whether to apply according to the release and capabilities of the terminal. In this case, the size of the reserved bit field is set by the base station, and if the base station does not set it or specifies a size of 0, or if the terminal can support any other PEI-related information set by the base station, the terminal may not expect reserved bits explicitly specified on the DCI format 2_Q.

[0223] For example, when the configuration of the rsv-bit-field considering the above-mentioned DCI size alignment is used, for example, when Proposal 1 and Proposal 2 are used in combination, the DCI of the PDCCH-based PEI is set based on the size of DCI format 1_0. In addition, when the size of the information transmitted and received by the PEI is L 1 and the size of the reserved bit field is R 1 The size of DCI format 1_0 is determined to be N bits. 1 When it is determined that 1 +R 1 The size of N 1 The smaller is considered.

[0224] In this example, when the method of indicating frozen bits proposed in Proposal 1 is applied, the PDCCH for the PEI is generated using DCI format 1_0 in which the CRC is scrambled with the PEI-RNTI. In this case, the base station and the terminal use N bits of the DCI format 1_0 in the transmission and reception of the PDCCH-based PEI. 1 -(L 1 +R 1 It can be assumed that the M ) bit is set as a frozen bit with a value of 0. For this purpose, the base station 1 and R 1 Notifies the device of the size information.

[0225] Alternatively, in one example, when the method of inserting padding bits proposed in Proposal 1 is used, a new DCI format for the PEI is defined (hereinafter, DCI format 2_Q), and the PDCCH for the PEI is generated using DCI format 2_Q in which the CRC is scrambled with the PEI-RNTI. In this case, when the PEI is transmitted and received on the CSS, the base station and the terminal assume that zero padding bits are inserted to match the size of the DCI format 2_Q to the size of the DCI format 1_0 transmitted and received on another CSS in the same cell in which the CSS is transmitted. For this purpose, the base station inserts zero padding bits into the L transmitted by the PEI. 1 and R1 Notifies the device of the size information.

[0226] In conventional NR, when different RNTI values ​​are applied to the same DCI format, information can be divided, and the amount of information differs between each divided piece of information, the reserved bit area configured in the DCI format is used. The method of configuring the reserved bit field in this manner has limitations in that it is difficult to flexibly configure the reserved bit field in consideration of the wireless communication environment of the base station and the terminal, and another method for improving the decoding performance of the terminal cannot be applied. On the other hand, when Proposal 2 is applied to the PEI as in this invention, there is an advantage that the base station may or may not configure a small reserved bit field as necessary to ensure the decoding performance of the PDCCH-based PEI of the terminal.

[0227] In the future, if new functions and information are added to the PEI and the base station wishes to support this, the DCI field indicating the new functions and information can be configured to be recognized as a reserved bit field by conventional terminals according to the base station settings, thereby ensuring forward compatibility as necessary.

[0228] Proposal 3: Determining monitoring rules for PDCCH candidates for new channels

[0229] In NR, in consideration of the complexity due to BD and channel estimation occurring in the process of the terminal monitoring the PDCCH, a method is used in which the terminal adjusts the DCI size monitored per cell, limits the maximum number of PDCCH candidates monitored per cell / slot (hereinafter, BD limit), and limits the maximum number of non-overlapped CCEs monitored per cell / slot (hereinafter, CCE limit). Therefore, when a DCI format with a new size is introduced and / or monitoring of a new search space is added, monitoring of PDCCHs that the terminal can expect to receive is affected. This proposal is applied to solve the problem of BD limit / CCE limit that occurs when a new RNTI value is applied to a DCI format that was previously used, a new DCI format with the same size as the previous DCI format is introduced, or a DCI format with a new size is introduced.

[0230] In the following, the method is described based on the PDCCH-based PEI discussed in the Rel-17 NR power saving item, but is not limited to this.

[0231] Proposal 3-1: Do not expect to receive any specific RNTI-based information in connected mode

[0232] In the ongoing NR Rel-17 standardization, the introduction of PEI is being discussed to improve the paging performance of the terminal, and is expected to have a beneficial effect on increasing the power saving gain of terminals that monitor paging at the period of the DRX cycle, such as terminals in idle / inactive mode. On the other hand, in the case of terminals in connected mode, the requirements for paging monitoring are set relatively low, and reference signals such as CSI-RS / TRS are specified to improve the performance of transmission and reception of physical channels such as PDCCH, so the gain in power saving efficiency due to PEI is relatively small.

[0233] Therefore, a method is proposed for preventing the UE from monitoring the PDCCH-based PEI set in the idle / inactive mode any more in the connected mode. Specifically, when a specific DCI format (hereinafter, DCI-C) with a CRC scrambled with a specific RNTI (hereinafter, RNTI-C) is used for the PEI in the idle / inactive mode, it can be determined that the UE does not expect the CRC of DCI-C to be scrambled with RNTI-C in the connected mode. In this case, when the CRC of DCI-C is scrambled with an RNTI other than RNTI-C, the UE may expect to receive all (or a part) of the remaining RNTIs in the connected mode.

[0234] This is to reduce the operational complexity of the terminal by not restricting the terminal's PDCCH monitoring operation due to BD restriction / CCE restriction in a connected mode where a relatively low power saving gain is expected, or by not requiring additional procedures to avoid this.

[0235] Proposal 3-2: How to deprioritize the monitoring of search spaces (sets) associated with specific RNTIs

[0236] In the NR standard, when a terminal determines a PDCCH candidate to be monitored based on BD / CCE restrictions, information on the type and ID of a search space set in which the corresponding PDCCH is transmitted is taken into consideration. Specifically, for all CSS search space sets, it is assumed that the terminal monitors PDCCH candidates, and whether to monitor the PDCCH candidates included in the USS is determined based on the number of available monitoring times remaining after CSS monitoring in slot units and the ID of the USS. In this case, if a PDCCH-based PEI is introduced, the PEI is transmitted and received by the CSS, which makes the base station more complicated in scheduling the CSS considering BD / CCE restrictions, and increases the possibility of dropping the PDCCH candidates belonging to the USS.

[0237] To solve this problem, when determining whether to monitor PDCCH candidates based on BD restriction / CCE restriction in a situation where PDCCH-based PEI is transmitted in CSS, the priority of the search space set in which PEI is transmitted and received is determined to be the lowest. The terminal determines whether to monitor by giving priority to PDCCH candidates on CSS and PDCCH candidates on USS to be monitored in a specific slot, and monitors PDCCH candidates related to PEI only if the number of available times for PDCCH monitoring remains. Specifically, monitoring of PEI is allowed only if the number of available times for remaining monitoring is greater than the number of all PDCCH candidates for which PEI can be transmitted.

[0238] This is to prevent the situation where the scheduling for the existing CSS and USS is restricted by the addition of a new CSS, and to lower the priority of PEI monitoring, which has a relatively low expected gain. Also, compared to the method of completely eliminating PEI monitoring in the connected mode, it provides an opportunity for the terminal to receive PEI, and the terminal can obtain information related to power saving.

[0239] Proposal 3-3: Allow monitoring when there are PDCCH candidate transmissions of the same (size) DCI format

[0240] The RNTI scrambled by the PDCCH CRC is used to distinguish the purpose of the PDCCH. In this case, if there are multiple RNTI values ​​that a terminal can expect for a specific DCI format at the same location, the terminal monitors information corresponding to multiple RNTIs even in only one BD for a PDCCH candidate. This provides benefits in terms of terminal complexity and power saving efficiency without increasing the BD restriction / CCE restriction of the terminal.

[0241] Therefore, monitoring for receiving PDCCH-based PEI by the terminal may be limited to the case where monitoring is performed for the same DCI format (or DCI format of the same size) as the DCI format for PEI. Specifically, this method is defined to be applied only when the terminal is expected to receive PEI in a connected mode. As an example, this method is applied when a DCI format (hereinafter, DCI-PEI) used for transmitting and receiving PEI is generated based on DCI format 1_0 or size alignment is performed to have the same size as DCI format 0_0 / 1_0 (i.e., when proposal 1 of the present invention is applied). In addition, a situation in which a separate RNTI (hereinafter, PEI-RNTI) is used when transmitting and receiving PEI to distinguish between DCI formats of the same size and DCI-PEI can be considered. In this case, when the terminal monitors a PDCCH candidate in which the CRC of DCI format 0_0 / 1_0 is scrambled to a specific RNTI value (e.g., SI-RNTI, RA-RNTI, MsgB-RNTI, or P-RNTI), the terminal monitors DCI-PEI in which the CRC is scrambled to PEI-RNTI for the PDCCH candidate.

[0242] When this method is used in combination with Proposal 3-1, as an example, instead of a separate monitoring position being specified for transmitting and receiving PEI in connected mode, the terminal expects to receive PEI only when monitoring is performed for PDCCH candidates that meet the conditions of Proposal 3-3.

[0243] This method is expected to be beneficial because it does not affect the BD / CCE restrictions of the terminal and provides an opportunity to receive PEI.

[0244] Proposal 3-4: Applying different DCI formats depending on the terminal's operating mode

[0245] The issue of monitoring restrictions on PDCCH candidates due to BD / CCE restrictions is mainly considered in connected mode. This is because the number of search space sets and DCI formats expected by the UE in connected mode is set to be larger than that in idle / inactive mode. In particular, when the UE switches from idle / inactive mode to connected mode, various CSSs and USSs to be monitored are additionally set according to the PDCCH-config information received as UE-specific RRC signaling, which causes monitoring restrictions on PDCCH candidates due to BD / CCE restrictions.

[0246] Considering these characteristics, we propose a method to apply different assumptions on the reception of PEI that a terminal can expect in idle / inactive mode and in connected mode.

[0247] Specifically, the reception assumption regarding the PEI includes the type or variety of the DCI format. For example, in the idle / inactive mode, the DCI format in which the PEI is transmitted (hereinafter, DCI-pei) may be allowed to be configured with a relatively smaller number of bits than DCI format 1_0, and / or DCI format 1_0 may be used in the connected mode. In this case, an identifier (e.g., RNTI) that can be distinguished from transmission and reception for other purposes in which DCI format 1_0 is used is used for transmission of the PDCCH used in the connected mode for the PEI purpose. In this case, when DCI format 1_0 has a size of N bits and the information of the PEI is configured with M (≦N) bits, the remaining NM bits are regarded as reserved bits or are defined as frozen bits as in Proposal 1.

[0248] As another example, in the idle / inactive mode, the DCI format (hereinafter, DCI-pei) in which the PEI is transmitted is allowed to be configured with a relatively smaller number of bits than DCI format 1_0, and / or in the connected mode, DCI-pei is adjusted to the size of DCI format 1_0. In order to distinguish DCI-pei from other DCI formats of the same size (i.e., including DCI format 1_0 and other DCIs of the same size), an identifier (e.g., RNTI) that can be distinguished from transmission and reception for other purposes is used. As a specific method, when DCI format 1_0 has a size of N bits and the PEI information is configured with M (≦N) bits, the method of specifying frozen bits and / or the method of inserting padding bits proposed in Proposal 1 are applied to the remaining NM bits.

[0249] This is suitable for using an appropriate DCI structure depending on the mode of the terminal, specifically, in idle / inactive mode, the number of DCI bits is reduced to obtain power saving gains, and in connected mode, DCI size alignment reduces the impact on the terminal's BD restriction / CCE restriction.

[0250] Proposal 4: Determining the aggregation level of PEI

[0251] In NR, in order to adjust the number of PDCCH blind decodings performed by the terminal, the AL (aggregation level) and the number of candidates that the terminal can expect when monitoring a specific SS (set) are predefined. As an example, it is defined that an idle / inactive mode terminal expects an AL and the number of candidates defined by the standard for the Type0 / 0A / 2-PDCCH CSS set that the terminal expects in DL BWP. The limited AL and number of candidates guarantees the minimum decoding reliability required by the PDCCH and prevents unnecessary BD of the terminal, thereby providing a power saving benefit. The following Table 9 is described in the TS38.213 standard and is used to determine the maximum possible number of CCE ALs and PDCCH candidates, and is applied to the above-mentioned Type0 / 0A / 2-PDCCH CSS set.

[0252] [Table 9]

[0253] In a similar manner, for the CSS set in which the PEI is transmitted, the size of the AL and / or PDCCH candidate is limited to a predefined size in order to increase the power saving gain of the terminal.

[0254] We propose a method to determine the number of CCE ALs and PDCCH candidates that a terminal can expect for a CSS set where PEI is transmitted and received.

[0255] Proposal 4-1: Using multiple tables to anticipate terminals in idle / inactive mode

[0256] In general, it is advantageous to use a smaller payload for PEI than for paging DCI in order to increase the reliability of PDCCH decoding. Therefore, decoding is possible at a lower AL than other types of CSS-set. In addition, a method of reducing the number of applicable ALs to less than three is also considered in order to reduce the number of BDs.

[0257] Considering such characteristics, when a CSS set for monitoring PEI by a terminal on DL BWP is set, multiple tables for CCE AL and PDCCH candidates applicable to the CSS set are defined, and one of them is selected and applied. An example of a table for multiple CCE AL and PDCCH candidates is Table 9 defined in the TS38.213 standard, and a table including an AL value smaller than that of Table 9 may be defined. Table 10 is an example of a table for CCE AL and PDCCH candidates that can be further defined. The present invention is not limited to Table 10, and the CCE AL and PDCCH candidates may be variously changed.

[0258] [Table 10]

[0259] As described above, when multiple tables for a combination of CCE AL and PDCCH candidates are defined, one specific method for determining which table is actually applied is for the base station to explicitly indicate it by higher layer signaling. As an example, when selecting one of two tables, the base station indicates the table to be used by an indicator (e.g., a 1-bit indicator) transmitted by the SIB. For example, when the 1 bit is 0 and when it is 1, the corresponding table may be set differently, or when there is no indicator (1 bit) on the higher layer signaling, the conventional table (e.g., table 9) is used, and if the indicator exists and has a value of 0 (or 1), a new table (e.g., table 10) is indicated, and otherwise it may be reserved. Such an explicit indication method has the advantage of ensuring adaptive scheduling of the base station.

[0260] Alternatively, a table is determined based on the payload size included in the PEI DCI. For example, when the number of DCI bits included in the PEI DCI is greater than N, a conventional table (e.g., Table 9) is used, and when the number of DCI bits is less than N, a new table (e.g., Table 10) is used. This is advantageous because it does not generate additional signaling overhead, and at the same time, since the DCI payload size is taken into consideration, the AL is determined in consideration of the PDCCH decoding reliability through which the PEI is transmitted, so that stable PEI performance can be expected.

[0261] Proposal 4-2: Applying relative values ​​to conventional tables

[0262] When a CSS set for PEI monitoring is configured on the DL BWP, the values ​​of the CCE AL and PDCCH candidates to be applied to the CSS set are determined relative to a conventional table (e.g., Table 9). This is advantageous because it allows reusing the previously defined Table 9 and indicating new values.

[0263] As a specific example of using relative values, a given integer N MPConsidering how to use the AL, the size of the CCE AL applied to the CSS set for PEI is AL PEI and the size of the CCE AL applied by the conventional table is AL Legacy When AL PEI =AL Legacy / N MP A value that satisfies the following is used for the PEI. Also, the maximum number of PDCCH candidates that can be applied to the CSS set for the PEI is NC PEI and the maximum number of PDCCH candidates applied by the conventional table is NC Legacy When NC PEI =NC Legacy *N MP A value satisfying the following is used for the PEI. As an example, even if not in the actual standard document, it is defined that the terminal can expect that the AL and PDCCH candidate values ​​applied to the CSS set for the PEI are applied as shown in Table 11. In this case, N MP The value of is defined to satisfy the condition of a power of 2 (i.e., 2X).

[0264] [Table 11]

[0265] Alternatively, the relative value may be explicitly indicated by higher layer signaling from the base station. For example, the relative value may be the predetermined integer N MP When the base station uses N MP The base station determines the value of , and explicitly indicates this value to the terminal via the SIB. This explicit indication method has the advantage of ensuring adaptive scheduling by the base station.

[0266] As another specific method, a relative value to be used may be determined based on the payload size included in the PEI DCI. For example, a predefined integer N may be used as a reference, and a N MP value, and conversely, N that applies when the number of PEI DCI bits is smaller than N MPThis is advantageous because it does not generate additional signaling overhead, and at the same time, it takes into account the DCI payload size, so stable PEI performance can be expected because the AL is determined taking into account the PDCCH decoding reliability on which the PEI is transmitted.

[0267] Proposal 5: Termination of PEI monitoring directive by PEI

[0268] In NR, a method of extending the PDCCH monitoring opportunity constituting a PO by X times for paging operation on a shared spectrum may be used. Specifically, according to the NR TS 38.304 standard, the number of consecutive PDCCH monitoring opportunities constituting a PO is defined as S*X, where 'S' means the number of SSBs actually transmitted determined by ssb-PositionsInBurst transmitted via SIB1, and 'X' means the number of repetitions of the PDCCH monitoring opportunity determined by nrofPDCCH-MonitoringOccasionPerSSB-InPO. The terminal performs paging PDCCH BD on the PO configured based on this. This is for the purpose of ensuring stable PDCCH transmission and reception even if frequency occupancy of other signals / channels occurs due to the characteristics of the shared spectrum, but there is a disadvantage that the number of PDCCH BDs increases from the terminal's perspective, which increases power consumption. To prevent this, a method is used in which the third bit of the short message field of DCI format 1_0 (hereinafter, paging DCI) scrambled with P-RNTI indicates "stopPagingMonitoring" when the spectrum is shared. If the "stopPagingMonitoring" bit indicates 1 in the paging DCI received by the UE, the UE stops BD for the remaining PDCCH monitoring opportunities of that PO.

[0269] When the PEI is supported in a shared spectrum, a method of extending the PDCCH monitoring occasions constituting the PEI-O may be used for the same purpose as paging. As an example, the PEI-O may be configured with S*Y consecutive PDCCH monitoring opportunities, similar to the method of configuring a PO. In this case, to determine the Y value, nrofPDCCH-MonitoringOccasionPerSSB-InPO configured for configuring a PO may be used, or a new parameter (e.g., nrofPDCCH-MonitoringOccasionPerSSB-InPEI) configured separately only for the PEI-O may be introduced. When the length of the PEI-O is extended, there is an advantage that the receivable PDCCH monitoring opportunities are increased, similar to the PO, and the paging reception opportunities of the UE are increased, but there is also a disadvantage that power consumption is increased due to an increase in the number of BDs.

[0270] To solve this problem, the PEI may include an indicator (e.g., another 1 bit) for indicating "stopPeiMonitoring" to stop PDCCH monitoring. If a value of Y>1 is set (e.g., if Y>1 is set by nrofPDCCH-MonitoringOccasionPerSSB-InPO or nrofPDCCH-MonitoringOccasionPerSSB-InPEI), the indicator (1 bit) may be implicitly configured in the PEI, which is also for the purpose of supporting operations required for power saving without generating additional signaling overhead. Alternatively, the indicator may be configured only when a value of Y>1 is set and a separate indicator indicating "stopPeiMonitoring" is included in the PEI DCI, which allows the base station to control the overhead of the PEI DCI and control the reception probability of the PEI. When the 'stopPeiMonitoring' indicator is set in the PEI DCI, if a terminal receiving the PEI confirms that the indicator indicates a specific value (e.g., 1), it is determined that it will not expect to receive any more PEI PDCCH during all or part of the remaining PDCCH monitoring opportunities of the corresponding PEI-O.

[0271] As another method, if the terminal receives a PDCCH in which the PEI is transmitted on the PEI-O at least once, it is defined that the terminal will not receive the PEI PDCCH any more in all or part of the remaining PDCCH monitoring opportunities of the PEI-O. In this case, receiving the PDCCH means that the terminal decodes the PDCCH, checks the PDCCH CRC using the RNTI used for the PEI, and successfully detects the PDCCH. When such a method is used, since no additional indication bits are added, it is expected to have an advantageous effect in reducing the overhead of the PEI DCI.

[0272] As another method, when the DCI field on the PEI DCI received by the terminal does not have information indicating enable, the terminal recognizes this as an instruction to stop PEI monitoring, and defines not to receive the PEI PDCCH any more in all or part of the remaining PDCCH monitoring opportunities of the PEI-O. As an example, the DCI field on the PEI DCI may include a UE group / subgroup indication field (i.e., a field indicating whether to wake up according to a bitmap that distinguishes UE groups / subgroups), and may include a condition for the case where there is no enable information when all UE groups / subgroups are indicated as non-wake up (e.g., when all UE group / subgroup fields indicate a value of 0 and all terminals that have received the PEI do not expect to receive a paging PDCCH at the position of the associated PO). And / or, a condition for the case where there is no enable information may be included when TRS availability indication information is included in the PEI DCI and there is no TRS resource indicating the valid state of the DCI field. And / or a condition in which information of SI change indication and ETWS / CMAS notification is included in the PEI DCI and there is no information indicating that the DCI field is in a valid state may be included. This method may be a sub-condition included in the case where the terminal receives a PDCCH on the PEI-O at least once, as described in the above or other methods, in order to set an operation promised between the base station and the terminal, and to recognize that even if the terminal receives a PEI with all information disabled, this is not treated as an error case, but is recognized as one means of information transmission.

[0273] In the above proposal, if it is determined that the terminal does not receive PEI in the remaining part of the period, the part of the period may be determined as a unit of S PDCCH monitoring opportunities from the first PDCCH monitoring opportunity started by PEI-O. For example, if the terminal receives PEI in the Pth PDCCH monitoring opportunity on PEI-O, it may receive PEI PDCCH in PDCCH monitoring opportunities up to ceil(P / S)*Sth PDCCH monitoring opportunity, and thereafter, it may not receive PEI PDCCH from ceil(P / S)S+1th PDCCH monitoring opportunity. This is to ensure the transmission and reception of PEI in all SSB beam directions that the terminal can expect to receive, taking into account multi-beam operation, and also when different information is transmitted in each PDCCH monitoring opportunity of PEI-O (for example, when the information of TRS availability indication is different), the terminal obtains different information in each PDCCH monitoring opportunity.

[0274] FIG. 11 is a diagram for explaining a DCI format for a PEI according to one embodiment of the present invention.

[0275] Referring to FIG. 11, the DCI format for PEI is received by one or more terminals. For convenience, it is assumed that the DCI format for PEI is mapped to a CSS set that UE1 and UE2 commonly monitor. UE1 and UE2 may be UEs having different capabilities (or different UE classes). In addition, the DCI format for PEI may be a new DCI format different from the DCI format defined in the Rel.15 to Rel.16 NR standards.

[0276] The base station indicates the payload size of the DCI format for the PEI common to UE1 and UE2 to be N-bits by higher layer signaling.

[0277] Each of UE1 and UE2 assumes an N-bit DCI payload size and attempts to detect DCI for PEI on the CSS set based on the PEI-RNTI.

[0278] The DCI information bit sizes assumed by UE1 and UE2 may be different. For example, UE1 assumes that the DCI information bits are all M bits, while UE2 assumes that the DCI information bits are all L bits (M≠L). In FIG. 11, it is assumed that M < L. Specifically, referring to FIG. 11, UE1 assumes that the M information bits of the DCI are composed of the first information bit regarding the paging indication and the second information bit regarding the TRS availability. On the other hand, UE2 assumes that the L information bits of the DCI not only include the first information bit regarding the paging indication and the second information bit regarding the TRS availability, but also assume that a third information bit is configured in the DCI.

[0279] Thus, the size of the reserved bits of the DCI for PEI may be a variable determined according to the network signaling and the information bit size interpretable by the corresponding UE.

[0280] FIG. 12 is a diagram for explaining a signal reception method of a terminal according to an embodiment of the present invention.

[0281] Referring to FIG. 12, the terminal receives setting information regarding PEI (paging early indication) by upper layer signaling (A1205).

[0282] Based on the setting information regarding PEI, the terminal monitors a first PDCCH carrying DCI (downlink control information) of a format for PEI in the RRC (radio resource control) idle or RRC inactive state (A1210).

[0283] Based on the detection of the DCI in the format for the PEI, the terminal monitors a second PDCCH for paging in a paging occasion (PO) associated with the PEI (A1215).

[0284] The configuration information for the PEI includes information regarding the DCI payload size "N" of the format for the PEI.

[0285] The DCI in the format for the PEI includes a first information bit related to paging and a second information bit related to tracking reference signal (TRS) availability in an RRC idle or RRC inactive state.

[0286] The size 'M' of all information bits of the DCI in the format for the PEI, including the first information bits and the second information bits, does not exceed the DCI payload size 'N'.

[0287] The terminal assumes "N"-"M" reserved bits based on the DCI payload size "N" and the total information bit size "M" included in the configuration information for the PEI, and detects the DCI in the format for the PEI.

[0288] The size of the reserved bits "N"-"M" is a variable determined based on the size of the total information bits "M" determined by the terminal and the DCI payload size "N" set in the terminal by higher layer signaling.

[0289] A cyclic redundancy check (CRC) of the first PDCCH is scrambled with a radio network temporary identifier (PEI-RNTI). The terminal monitors the first PDCCH based on the PEI-RNTI within a common search space (CSS) set.

[0290] The DCI in the format for the PEI is common to one or more terminals including the terminal.

[0291] The first PDCCH carrying DCI in the format for PEI is monitored only when the terminal is in an RRC idle state or when the terminal is in an RRC inactive state. In an RRC connected state, the terminal stops monitoring the first PDCCH carrying DCI in the format for PEI.

[0292] The higher layer signaling is associated with a system information block (SIB).

[0293] The configuration information regarding the PEI includes information regarding the size of the first information bits and information regarding the size of the second information bits.

[0294] FIG. 13 is a diagram for explaining a signal transmission method of a base station according to one embodiment of the present invention.

[0295] Referring to FIG. 13, the base station transmits configuration information regarding a paging early indication (PEI) through higher layer signaling (A1305).

[0296] Based on the configuration information regarding the PEI, the base station transmits a first PDCCH carrying downlink control information (DCI) in a format for the PEI when the terminal is in an RRC (radio resource control) idle or RRC inactive state (A1310).

[0297] The base station transmits a second PDCCH for paging in a paging occasion (PO) associated with the PEI based on the DCI in the format for the PEI (A1315).

[0298] The configuration information for the PEI includes information regarding the DCI payload size "N" of the format for the PEI.

[0299] The DCI in the format for the PEI includes a first information bit related to paging and a second information bit related to tracking reference signal (TRS) availability in an RRC idle or RRC inactive state.

[0300] The size 'M' of all information bits of the DCI in the format for the PEI, including the first information bits and the second information bits, does not exceed the DCI payload size 'N'.

[0301] The base station sets "N"-"M" reserved bits based on the DCI payload size "N" and the total information bit size "M" included in the configuration information for the PEI.

[0302] The size of the reserved bits 'N'-'M' is a variable that is determined based on the size of the total information bits 'M' and the DCI payload size 'N' set by higher layer signaling.

[0303] A cyclic redundancy check (CRC) of the first PDCCH is scrambled with a radio network temporary identifier (PEI-RNTI). The base station transmits the first PDCCH based on the PEI-RNTI within a common search space (CSS) set.

[0304] The DCI in the format for the PEI is common to one or more terminals including the terminal.

[0305] The transmission of the first PDCCH carrying DCI in the format for the PEI is performed only when the terminal is in an RRC idle state or when the terminal is in an RRC inactive state. The base station stops the transmission of the first PDCCH carrying DCI in the format for the PEI when the terminal is in an RRC connected state.

[0306] The higher layer signaling is associated with a system information block (SIB).

[0307] The configuration information regarding the PEI includes information related to a size of the first information bit and information related to a size of the second information bit.

[0308] FIG. 14 illustrates a communication system 1 to which the present invention is applied.

[0309] Referring to FIG. 14, 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.

[0310] 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.

[0311] 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.

[0312] FIG. 15 illustrates a wireless device to which the present invention can be applied.

[0313] 15, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals using 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 16 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).

[0321] Referring to Fig. 16, the wireless device 100, 200 corresponds to the wireless device 100, 200 of Fig. 15 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.

[0322] 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.

[0323] In FIG. 16, 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.

[0324] 17 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.

[0325] 17, 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.

[0326] 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.

[0327] 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.

[0328] FIG. 18 is a diagram for explaining a DRX (Discontinuous Reception) operation of a terminal according to one embodiment of the present invention.

[0329] 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).

[0330] Referring to FIG. 18, 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.

[0331] Table 12 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.

[0332] [Table 12]

[0333] 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:

[0334] - Value of drx-OnDurationTimer: defines the length of the start period of the DRX cycle

[0335] - 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

[0336] - 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.

[0337] - 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.

[0338] -drx-LongCycleStartOffset: defines the length and start of a DRX cycle

[0339] -drx-ShortCycle(optional): defines the time length of a short DRX cycle

[0340] 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.

[0341] 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.

[0342] 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]

[0343] 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 for a terminal receiving a signal in a wireless communication system, comprising: receiving configuration information regarding a paging early indication (PEI) through higher layer signaling; monitoring a first PDCCH carrying downlink control information (DCI) in a format for the PEI in a radio resource control (RRC) idle or inactive state based on configuration information related to the PEI; monitoring a second PDCCH for paging at a paging occasion (PO) associated with the PEI based on detection of a DCI in a format for the PEI; The configuration information regarding the PEI includes information regarding a DCI payload size “N” of a format for the PEI, The DCI in the format for the PEI includes a first information bit related to the paging and a second information bit related to a tracking reference signal (TRS) availability in the RRC idle or RRC inactive state, a size "M" of all information bits of a DCI in a format for the PEI, including the first information bits and the second information bits, does not exceed the DCI payload size "N", The method in which the terminal detects a DCI in a format for the PEI, assuming "N"-"M" reserved bits based on the DCI payload size "N" and the size of the total information bits "M" included in the configuration information regarding the PEI.

2. The method of claim 1, wherein the size of the reserved bits "N"-"M" is a variable determined based on the size of the total information bits "M" determined by the terminal and the DCI payload size "N" set in the terminal by the higher layer signaling.

3. The method of claim 1, wherein a cyclic redundancy check (CRC) of the first PDCCH is scrambled with a radio network temporary identifier (PEI-RNTI).

4. The method of claim 3, wherein the terminal monitors the first PDCCH based on the PEI-RNTI in a common search space (CSS) set.

5. The method of claim 1 , wherein the DCI in a format for the PEI is common to one or more terminals including the terminal.

6. The method of claim 1 , wherein monitoring of the first PDCCH carrying a DCI in a format for the PEI is performed only when the terminal is in an RRC idle state or when the terminal is in an RRC inactive state.

7. The method according to claim 6, wherein the terminal stops monitoring the first PDCCH carrying DCI in a format for the PEI in an RRC connected state.

8. The method of claim 1 , wherein the higher layer signaling is associated with a system information block (SIB).

9. The method of claim 1 , wherein the configuration information regarding the PEI includes information related to a size of the first information bit and information related to a size of the second information bit.

10. A computer-readable recording medium having recorded thereon a program for carrying out the method according to claim 1.

11. 1. A device for wireless communication, comprising: A memory for storing instruction words; a processor that operates by executing the instruction code; The operation of the processor includes receiving configuration information on a paging early indication (PEI) through higher layer signaling; monitoring a first PDCCH carrying downlink control information (DCI) in a format for the PEI in a radio resource control (RRC) idle or inactive state based on the configuration information on the PEI; and monitoring a second PDCCH for paging in a paging occasion (PO) associated with the PEI based on detection of the DCI in the format for the PEI; The configuration information regarding the PEI includes information regarding a DCI payload size “N” of a format for the PEI, The DCI in the format for the PEI includes a first information bit related to the paging and a second information bit related to a tracking reference signal (TRS) availability in the RRC idle or RRC inactive state, a size "M" of all information bits of a DCI in a format for the PEI, including the first information bits and the second information bits, does not exceed the DCI payload size "N", The device, wherein the processor assumes "N"-"M" reserved bits based on the DCI payload size "N" and the total information bit size "M" included in the configuration information for the PEI, and detects a DCI in a format for the PEI.

12. The device of claim 11 , further comprising a transceiver for transmitting or receiving wireless signals under control of the processor.

13. The method of claim 11 , wherein the device is a terminal (UE) operating in a wireless communication system.

14. 1. A method for a base station to transmit a signal in a wireless communication system, comprising: Sending configuration information regarding paging early indication (PEI) through higher layer signaling; Transmitting a first PDCCH carrying downlink control information (DCI) in a format for the PEI in a radio resource control (RRC) idle or inactive state of the terminal based on configuration information related to the PEI; and transmitting a second PDCCH for paging at a paging occasion (PO) associated with the PEI based on a DCI in a format for the PEI; The configuration information regarding the PEI includes information regarding a DCI payload size “N” of a format for the PEI, The DCI in the format for the PEI includes a first information bit related to the paging and a second information bit related to a tracking reference signal (TRS) availability in the RRC idle or RRC inactive state, a size "M" of all information bits of a DCI in a format for the PEI, including the first information bits and the second information bits, does not exceed the DCI payload size "N", The base station sets 'N'-'M' reserved bits based on the DCI payload size 'N' and the total information bit size 'M' included in the configuration information regarding the PEI.

15. 1. A base station for wireless communication, comprising: A memory for storing instruction words; A processor that operates by executing the instructions, The operation of the processor includes transmitting configuration information on a paging early indication (PEI) through higher layer signaling, transmitting a first PDCCH carrying downlink control information (DCI) in a format for the PEI in a radio resource control (RRC) idle or RRC inactive state of the terminal based on the configuration information on the PEI, and transmitting a second PDCCH for paging in a paging occasion (PO) associated with the PEI based on the DCI in the format for the PEI; The configuration information regarding the PEI includes information regarding a DCI payload size “N” of a format for the PEI, The DCI in the format for the PEI includes a first information bit related to the paging and a second information bit related to a tracking reference signal (TRS) availability in the RRC idle or RRC inactive state, a size "M" of all information bits of a DCI in a format for the PEI, including the first information bits and the second information bits, does not exceed the DCI payload size "N", A base station, wherein the processor sets "N"-"M" reserved bits based on the DCI payload size "N" and the total information bit size "M" included in the configuration information regarding the PEI.

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