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

Abstract

A method for a terminal to receive a signal in a wireless communication system according to one embodiment of the present application can include receiving a specific signal giving an advance indication of whether paging DCI will be provided in a PO configured for a paging operation in an idle mode or a dormant mode, and determining whether to skip a paging DCI detection procedure based on the specific signal, wherein the specific signal can be a PDCCH signal carrying a specific DCI configured for the idle mode or the dormant mode, and even if the specific DCI indicates that paging DCI will be provided in at least one PO, based on the specific DCI, the terminal can decide to skip the paging DCI detection procedure if at least one PO in which paging DCI is provided is not configured in the terminal.

Description

Technical Field

[0001] This disclosure relates to wireless communication systems, and more specifically, to a method and apparatus for transmitting and receiving wireless signals. Background Technology

[0002] Typically, wireless communication systems are evolving to provide communication services such as audio communication and data communication by covering a wider range of areas. Wireless communication is a multiple access system capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, a multiple access system can be any of the following: Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA). Summary of the Invention

[0003] Technical issues

[0004] The purpose of this disclosure is to provide a method and apparatus for efficiently performing wireless signal transmission / reception processes.

[0005] Those skilled in the art will understand that the purposes achievable with this disclosure are not limited to those specifically described above, and the above and other purposes achievable with this disclosure will become clearer from the following detailed description.

[0006] Technical solution

[0007] In one aspect of this disclosure, a method for receiving signals by a terminal in a wireless communication system is provided. The method may include the steps of: receiving a specific signal that pre-indicates whether paging downlink control information (DCI) should be provided on a paging opportunity (PO) configured for paging operations in idle or inactive modes; and determining, based on the specific signal, whether to skip the paging DCI detection process. The specific signal may be a physical downlink control channel (PDCCH) signal carrying a specific DCI configured for idle or inactive modes. Since a specific DCI may be associated with multiple POs, the terminal may determine to skip the paging DCI detection process even if the specific DCI indicates that it should be provided on at least one PO, unless at least one PO is configured to provide the paging DCI for the terminal.

[0008] The specific DCI that indicates whether paging DCI will be provided may include a short message field relating to at least one of the system information change or earthquake and tsunami warning system / commercial mobile alarm system (ETWS / CMAS) indications.

[0009] Even when the terminal determines to skip the paging DCI detection process, the terminal can still obtain the value of the short message field included in a specific DCI.

[0010] Short message fields included in a particular DCI may be at least partially the same as short message fields included in a paging DCI.

[0011] When a specific DCI is associated with N POs = {PO#1, PO#2, ..., PO#N}, and each PO is associated with a specific terminal group, the terminal can determine the ID of the specific terminal group to which the terminal belongs based on the number of POs "N" associated with the specific DCI and the PO information configured for the terminal.

[0012] The terminal can identify the bit position associated with a specific PO in a specific DCI based on the ID of a specific UE group.

[0013] The terminal may further consider the terminal identifier of the terminal to determine the ID of a specific terminal group.

[0014] The terminal can determine whether to skip the paging DCI detection process based on whether to provide paging DCI on a specific PO associated with a specific terminal group to which the terminal belongs among the N POs related to a specific DCI.

[0015] The terminal can obtain information from the base station about the number "N" of POs associated with a specific DCI.

[0016] The terminal can obtain information from the base station about the field configuration of a specific DCI or the size of at least one field included in a specific DCI.

[0017] In another aspect of this disclosure, a computer-readable recording medium may be provided having a program recorded thereon for performing a signal receiving method.

[0018] In another aspect of this disclosure, a terminal for performing the signal receiving method may be provided.

[0019] In another aspect of this disclosure, an apparatus for controlling a terminal to perform the signal receiving method may be provided.

[0020] In another aspect of this disclosure, a method for transmitting signals by a base station in a wireless communication system is provided. The method may include the steps of: transmitting a specific signal that indicates in advance whether paging downlink control information (DCI) should be provided on a paging opportunity (PO) configured for paging operations in idle or inactive modes; and transmitting the paging DCI based on the specific signal. The specific signal may be a physical downlink control channel (PDCCH) signal carrying the specific DCI configured for idle or inactive modes. The base station may associate the specific DCI with multiple POs and transmit the specific DCI once to collectively indicate whether a paging DCI is provided for each of the multiple POs.

[0021] In another aspect of this disclosure, a base station for performing the signal transmission method may be provided.

[0022] Beneficial effects

[0023] According to embodiments of this disclosure, by indicating whether to send a paging DCI via PEI, the terminal can operate more efficiently in idle / inactive mode.

[0024] Those skilled in the art will understand that the effects that can be achieved using this disclosure are not limited to those specifically described above, and other advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings. Attached Figure Description

[0025] Figure 1 The physical channel used in the 3rd Generation Partnership Project (3GPP) system, which serves as an exemplary wireless communication system, and the general signal transmission method using it are illustrated.

[0026] Figure 2 The structure of a radio frame is shown.

[0027] Figure 3 The resource grid for the time slot is shown.

[0028] Figure 4 An exemplary mapping of physical channels in a time slot is shown.

[0029] Figure 5 An exemplary physical downlink control channel (PDCCH) transmission and reception process is illustrated.

[0030] Figures 6 to 7 The structure of the control resource set (CORESET) is shown.

[0031] Figure 8 The BS operation according to an embodiment of the present disclosure is shown.

[0032] Figure 9 The UE operation according to an embodiment of the present disclosure is illustrated.

[0033] Figure 10 and Figure 11 The PEI is shown according to an embodiment of the present disclosure.

[0034] Figure 12 and Figure 13 A short message is shown according to an embodiment of this disclosure.

[0035] Figure 14 and Figure 15 This is an example of an implementation of UE operation according to an embodiment of this disclosure.

[0036] Figure 16The flowchart of a signal transmission / reception method according to an embodiment of the present disclosure is shown.

[0037] Figures 17 to 20 Examples of communication system 1 and wireless device applicable to this disclosure are shown.

[0038] Figure 21 An exemplary discontinuous reception (DRX) operation applicable to this disclosure is shown. Detailed Implementation

[0039] The embodiments of this disclosure are applicable to various radio access technologies such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA). CDMA can be implemented as radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate GSM Evolution (EDGE). OFDMA can be implemented as radio technologies such as IEEE 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Global Microwave Access Interoperability (WiMAX)), IEEE 802.20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS using E-UTRA (E-UMTS), and LTE-Advanced (A) is an evolution of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolution of 3GPP LTE / LTE-A.

[0040] As more and more communication devices require greater communication capacity, there is a need for enhanced mobile broadband communications compared to traditional radio access technologies (RATs). Furthermore, the ability to provide various services anytime, anywhere by connecting multiple devices and objects is another important consideration for next-generation communications. Communication system designs considering reliability and latency-sensitive services / UEs are also being discussed. Therefore, the introduction of new radio access technologies incorporating enhanced mobile broadband (eMBB), massive MTC, and ultra-reliable low-latency communication (URLLC) is being discussed. In embodiments of this disclosure, for simplicity, this technology will be referred to as NR (New Radio or New RAT).

[0041] For the sake of brevity, this disclosure primarily describes 3GPP NR, but the technical concepts herein are not limited thereto.

[0042] For background information, definitions of terms and abbreviations related to this disclosure, the following references may be incorporated by way of citation.

[0043] 3GPP LTE

[0044] -TS 36.211: Physical Channels and Modulation

[0045] -TS 36.212: Multiplexing and Channel Coding

[0046] -TS 36.213: Physical Layer Processes

[0047] -TS 36.300: General Description

[0048] -TS 36.321: Media Access Control (MAC)

[0049] -TS 36.331: Radio Resource Control (RRC)

[0050] 3GPP NR

[0051] -TS 38.211: Physical Channels and Modulation

[0052] -TS 38.212: Multiplexing and Channel Coding

[0053] -TS 38.213: Physical layer procedures for control

[0054] -TS 38.214: Physical layer procedures for data

[0055] -TS 38.300: General Description of NR and NG-RAN

[0056] -TS 38.321: Media Access Control (MAC)

[0057] -TS 38.331: Radio Resource Control (RRC) Protocol Specification

[0058] Terms and abbreviations

[0059] -SS: Search Space

[0060] -CSS: Public Search Space

[0061] -USS: UE-specific search space

[0062] -PDCCH: Physical Downlink Control Channel; PDCCH is used to represent the various structures of PDCCH that can be used for the same purpose in the following description.

[0063] -DCI: Downlink Control Information

[0064] -WUS: Wake-up signal

[0065] -UG field: A bit field configured in DCI for use in UE group indication.

[0066] -UE_G_ID: UE group ID

[0067] In a wireless communication system, a user equipment (UE) receives information from a base station (BS) via a downlink (DL) and transmits information to the BS via an uplink (UL). The information transmitted and received by the BS and UE includes data and various control information, and involves various physical channels depending on the type / purpose of the information transmitted and received by the UE and BS.

[0068] Figure 1 The physical channels used in a 3GPP NR system and the general signal transmission methods using them are shown.

[0069] When the UE is powered on again from a power-off state or enters a new cell, in step S101, the UE performs an initial cell search procedure (e.g., establishing synchronization with the BS). For this purpose, the UE receives a synchronization signal block (SSB) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE establishes synchronization with the BS based on the PSS / SSS and obtains information such as the cell identifier (ID). The UE can obtain broadcast information within the cell based on the PBCH. During the initial cell search process, the UE can receive a DL reference signal (RS) to monitor the DL channel status.

[0070] After the initial cell search, in step S102, the UE can obtain more specific system information by receiving the Physical Downlink Control Channel (PDCCH) and receiving the Physical Downlink Shared Channel (PDSCH) based on the information in the PDCCH.

[0071] In steps S103 to S106, the UE may perform a random access procedure to access the BS. For random access, the UE may send a preamble to the BS on the Physical Random Access Channel (PRACH) (S103) and receive a response message for the preamble on the PDCCH and the corresponding PDSCH (S104). In the case of contention-based random access, the UE may further perform a contention resolution procedure by sending a PRACH (S105) and receiving the PDCCH and the corresponding PDSCH (S106).

[0072] Following the aforementioned process, the UE can receive the PDCCH / PDSCH (S107) and transmit the Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) (S108), as part of the general downlink / uplink signal transmission process. The control information sent from the UE to the BS is called Uplink Control Information (UCI). UCI includes Hybrid Automatic Repeat and Request Acknowledgment / Nack Acknowledgment (HARQ-ACK / NACK), Scheduling Request (SR), Channel State Information (CSI), etc. CSI includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), etc. Although UCI is usually transmitted on the PUCCH, it can be transmitted on the PUSCH when control information and service data need to be transmitted simultaneously. Additionally, UCI can be transmitted aperiodically via the PUSCH according to network requests / commands.

[0073] Figure 2 The radio frame structure is shown. In NR, uplink and downlink transmissions are configured in frames. Each radio frame is 10ms long and is divided into two 5ms half-frames (HF). Each half-frame is further divided into five 1ms subframes (SF). Subframes are divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 orthogonal frequency division multiplexing (OFDM) symbols. When using a normal CP, each time slot includes 14 OFDM symbols. When using an extended CP, each time slot includes 12 OFDM symbols.

[0074] Table 1 illustrates, for example, how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS when using normal CP.

[0075] [Table 1]

[0076] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 15kHz (u=0) 14 10 1 30kHz (u=1) 14 20 2 60kHz (u=2) 14 40 4 120kHz (u=3) 14 80 8 240kHz (u=4) 14 160 16

[0077] *N slot symb Number of symbols in a time slot

[0078] *N frame,u slot Number of time slots in a frame

[0079] *N subframe,u slot Number of time slots in a subframe

[0080] Table 2 shows the number of symbols per slot, the number of slots per frame, and the number of slots per subframe that vary according to SCS when using extended CP.

[0081] [Table 2]

[0082]

[0083]

[0084] The frame structure is only an example. The number of subframes, time slots, and symbols in a frame can vary.

[0085] In NR systems, OFDM parameter sets (e.g., SCS) can be configured differently for multiple cells aggregated for a single UE. Therefore, the (absolute time) duration of time resources (e.g., SF, time slots, or TTI) (referred to as time units (TU) for simplicity) consisting of the same number of symbols can be configured differently among the aggregated cells. Here, symbols can include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or Discrete Fourier Transform-Extended-OFDM (DFT-s-OFDM) symbols).

[0086] Figure 3 The resource grid shows a time slot. A time slot comprises multiple symbols in the time domain. For example, when using a normal CP, a time slot comprises 14 symbols. However, when using an extended CP, a time slot comprises 12 symbols. A carrier comprises multiple subcarriers in the frequency domain. A resource block (RB) is defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 consecutive subcarriers). A bandwidth portion (BWP) can be defined as multiple consecutive physical RBs (PRBs) in the frequency domain and corresponds to a single set of parameters (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., five) BWPs. Data communication can be performed through enabled BWPs, and only one BWP can be enabled for a UE. In the resource grid, individual elements are called resource elements (REs), and a complex symbol can be mapped to individual REs.

[0087] Figure 4 This illustrates an example of mapping physical channels within a time slot. In an NR system, a frame is characterized by a self-contained structure consisting of a DL control channel, DL or UL data, and a UL channel, all of which can be included within a single time slot. For example, the first N symbols of a time slot can be used to carry a DL channel (e.g., PDCCH) (hereinafter referred to as the DL control region), and the last M symbols of the time slot can be used to carry a UL channel (e.g., PUCCH) (hereinafter referred to as the UL control region). Each of N and M is an integer equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter referred to as the data region) can be used to transmit DL data (e.g., PDSCH) or UL data (e.g., PUSCH). The guard period (GP) provides a time gap for switching from transmit mode to receive mode or from receive mode to transmit mode. Some symbols in a subframe during a DL-to-UL handover can be configured as GP.

[0088] The PDCCH transmits DCI. For example, the PDCCH (i.e., DCI) may carry information about the transmission format and resource allocation of the DL-SCH, resource allocation information for the Uplink Shared Channel (UL-SCH), paging information for the PCH, system information for the DL-SCH, resource allocation information for higher-layer control messages (e.g., RARs transmitted on the PDCCH), transmission power control commands, and information about enabling / releasing configured schedules. The DCI includes Cyclic Redundancy Check (CRC). The CRC is masked using various identifiers (IDs) (e.g., Radio Network Temporary Identifiers (RNTIs)) depending on the owner or purpose of the PDCCH. For example, if the PDCCH is used for a specific UE, the CRC is masked using the UE ID (e.g., Cell-RNTI (C-RNTI)). If the PDCCH is used for paging messages, the CRC is masked using the Paging-RNTI (P-RNTI). If the PDCCH is used for system information (e.g., System Information Block (SIB)), the CRC is masked using the System Information RNTI (SI-RNTI). When the PDCCH is used for RAR, the CRC is masked using the Random Access-RNTI (RA-RNTI).

[0089] Figure 5 An exemplary PDCCH send / receive process is shown.

[0090] Reference Figure 5The BS can send control resource set (CORESET) configuration to the UE (S502). A CORESET is defined as a set of resource element groups (REGs) with a given set of parameters (e.g., subcarrier spacing (SCS), cyclic prefix (CP) length, etc.). Each REG is defined as an OFDM symbol by a (physical) resource block (P)RB. Multiple CORESETs for a UE can overlap in the time / frequency domain. A CORESET can be configured by system information (e.g., master information block (MIB)) or higher-layer signaling (e.g., radio resource control (RRC) signaling). For example, configuration information about a specific common CORESET (e.g., CORESET#0) can be sent in the MIB. For example, the PDSCH carrying system information block 1 (SIB1) can be scheduled by a specific PDCCH, and CORESET#0 can be used to send the specific PDCCH. Furthermore, configuration information about CORESET#N (e.g., N>0) can be sent via RRC signaling (e.g., cell common RRC signaling, UE-specific RRC signaling, etc.). For example, UE-specific RRC signaling carrying CORESET configuration information may include (but is not limited to) various types of signaling, such as RRC establishment messages, RRC reconfiguration messages, and / or BWP configuration information. Specifically, CORESET configuration may include the following information / fields.

[0091] -controlResourceSetId: Indicates the ID of CORESET.

[0092] -frequencyDomainResources: Indicates the frequency domain resources of CORESET. Resources are indicated by a bitmap corresponding to each bit and RB group (= 6 (contiguous) RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in BWP. The RB group corresponding to the bit with a value of 1 is allocated as the frequency domain resources of CORESET.

[0093] -duration: Indicates the time-domain resources of the CORESET. It indicates the number of consecutive OFDM symbols included in the CORESET. The duration has a value between 1 and 3.

[0094] -cce-REG-MappingType: Indicates the mapping type from Control Channel Elements (CCEs) to REGs. Interleaved and non-interleaved types are supported.

[0095] -interleaverSize: Indicates the interleaver size.

[0096] -pdcch-DMRS-ScramblingID: Indicates the value used for PDCCH DMRS initialization. When pdcch-DMRS-ScramblingID is not included, the physical cell ID of the serving cell is used.

[0097] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0098] -reg-BundleSize: Indicates the REG bundle size.

[0099] -tci-PresentInDCI: Indicates whether the Transport Configuration Index (TCI) field is included in the DL-related DCI.

[0100] -tci-StatesPDCCH-ToAddList: Indicates a subset of TCI states configured in pdcch-Config that are used to provide quasi-colocation (QCL) relationships between DL RS and PDCCH DMRS ports in the RS set (TCI states).

[0101] In addition, the BS can send PDCCH search space (SS) configuration to the UE (S504). The PDCCH SS configuration can be sent via higher-layer signaling (e.g., RRC signaling). For example, RRC signaling may include (but is not limited to) various types of signaling, such as RRC establishment messages, RRC reconfiguration messages, and / or BWP configuration information. Although for the sake of description, Figure 5 The CORESET configuration and PDCCH SS configuration are shown as being signaled separately, but this disclosure is not limited thereto. For example, the CORESET configuration and PDCCH SS configuration may be sent in a single message (e.g., via an RRC signaling) or separately in different messages.

[0102] The PDCCH SS configuration may include information about the configuration of the PDCCH SS set. A PDCCH SS set can be defined as a set of PDCCH candidates monitored by the UE (e.g., blind detection). One or more SS sets can be configured for the UE. Each SS set can be a UE-specific search space (USS) set or a common search space (CSS) set. For convenience, the PDCCH SS set may be referred to as "SS" or "PDCCH SS".

[0103] The PDCCH SS set includes PDCCH candidates. PDCCH candidates are the CCEs that the UE monitors to receive / detect PDCCHs. Monitoring includes blind decoding (BD) of the PDCCH candidates. A PDCCH (candidate) includes 1, 2, 4, 8, or 16 CCEs depending on the aggregation level (AL). A CCE includes 6 REGs. Each CORESET configuration is associated with one or more SSs, and each SS is associated with a CORESET configuration. An SS is defined based on an SS configuration, and the SS configuration may include the following information / fields.

[0104] -searchSpaceId: Indicates the ID of the SS.

[0105] -controlResourceSetId: Indicates the CORESET associated with SS.

[0106] -monitoringSlotPeriodicityAndOffset: Indicates the periodicity (in slots) and offset (in slots) of the PDCCH monitoring.

[0107] -monitoringSymbolsWithinSlot: Indicates the first OFDM symbol used for PDCCH monitoring in the slot configured for PDCCH monitoring. The first OFDM symbol used for PDCCH monitoring is indicated by a bitmap of individual bits corresponding to OFDM symbols in the slot. The MSB of the bitmap corresponds to the first OFDM symbol in the slot. The OFDM symbol corresponding to the bit set to 1 corresponds to the first symbol of the CORESET in the slot.

[0108] -nrofCandidates: Indicates the number of PDCCH candidates for each AL (one of the values ​​0, 1, 2, 3, 4, 5, 6, and 8), where AL = {1, 2, 4, 8, 16}.

[0109] -searchSpaceType: Indicates the DCI format used in CSS or USS and the corresponding SS type.

[0110] Subsequently, the BS can generate a PDCCH and send it to the UE (S506), and the UE can monitor PDCCH candidates in one or more SSs to receive / detect the PDCCH (S508). The timing when the UE monitors the PDCCH candidates (e.g., time / frequency resources) is defined as the PDCCH (monitoring) timing. One or more PDCCH (monitoring) timings can be configured in a time slot.

[0111] Table 3 shows the characteristics of each SS.

[0112] [Table 3]

[0113]

[0114] Table 4 shows the DCI format transmitted on the PDCCH.

[0115] [Table 4]

[0116]

[0117] DCI format 0_0 can be used to schedule PUSCH based on TB (or TB level), and DCI format 0_1 ​​can be used to schedule PUSCH based on TB (or TB level) or PUSCH based on code block group (CBG) (or CBG level). DCI format 1_0 can be used to schedule PDSCH based on TB (or TB level), and DCI format 1_1 can be used to schedule PDSCH based on TB (or TB level) or PDSCH based on CBG (or CBG level) (or DL-licensed DCI). DCI formats 0_0 / 0_1 can be referred to as UL-licensed DCI or UL scheduling information, and DCI formats 1_0 / 1_1 can be referred to as DL-licensed DCI or DL ​​scheduling information. DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic slot format indicator (SFI)) to the UE, and DCI format 2_1 is used to transmit DL preemption information to the UE. DCI formats 2_0 and / or DCI format 2_1 can be transmitted to the corresponding group of UEs on the group common PDCCH (PDCCH pointing to a group of UEs).

[0118] DCI formats 0_0 and 1_0 can be referred to as fallback DCI formats, while DCI formats 0_1 and 1_1 can be referred to as non-fallback DCI formats. In fallback DCI formats, the DCI size / field configuration remains the same regardless of the UE configuration. Conversely, in non-fallback DCI formats, the DCI size / field configuration varies depending on the UE configuration.

[0119] The CCE to REG mapping type is configured as either an interleaved CCE to REG type or a non-interleaved CCE to REG type.

[0120] - Non-interleaved CCE to REG mapping (or local CCE to REG mapping) Figure 6 ): The 6 REGs used for a given CCE are grouped into a REG bundle, and all REGs used for a given CCE are adjacent. One REG bundle corresponds to one CCE.

[0121] - Interleaved CCE to REG mapping (or distributed CCE to REG mapping) Figure 7): Two, three, or six REGs for a given CCE are grouped into a REG bundle, and the REG bundles are interleaved within the CORESET. In a CORESET containing one or two OFDM symbols, the REG bundle consists of two or six REGs, and in a CORESET containing three OFDM symbols, the REG bundle consists of three or six REGs. The REG bundle size is set based on the CORESET.

[0122] paging

[0123] The network can (i) access UEs in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states via paging messages, and (ii) notify UEs in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states of system information changes and Earthquake and Tsunami Warning System / Commercial Mobile Alarm System (ETWS / CMAS) notifications via short messages. Both paging messages and short messages are transmitted on a P-RNTI-based PDCCH. Paging messages are transmitted on a logical channel (Paging Control Channel (PCCH)), while short messages are transmitted directly on the physical channel PDCCH. Because the logical channel PCCH is mapped to the physical channel PDSCH, paging messages can be understood as being scheduled on a P-RNTI-based PDCCH basis.

[0124] While the UE remains in the RRC_IDLE state, the UE monitors the paging channel and initiates paging through the core network (CN). In the RRC_INACTIVE state, the UE also monitors the paging channel and initiates paging through the radio access network (RAN). The UE does not need to continuously monitor the paging channel. Discontinuous paging reception (DRX) is defined as the UE in either the RRC_IDLE or RRC_INACTIVE state monitoring the paging channel only during one paging opportunity (PO) per DRX cycle. The paging DRX cycle is configured by the network as follows.

[0125] 1) When CN initiates paging, broadcast the default loop in the system information.

[0126] 2) When paging is initiated by CN, configure a specific loop for UE via NAS signaling.

[0127] 3) When the RAN initiates signaling, configure a UE-specific cycle via RRC signaling.

[0128] Because all POs used for CN-initiated signaling and RAN-initiated signaling of a UE are based on the same UE ID, the two POs overlap. The number of POs in the DRX cycle can be set through system information, and the network can assign UEs to POs based on their IDs.

[0129] When the UE is in the RRC_CONNECTED state, the UE monitors the paging channel SI change indication and PWS notification in each PO notified by system information signaling. In Bandwidth Adaptation (BA), the RRC_CONNECTED UE only monitors the paging channel in the active BWP where the configured CSS is located.

[0130] In shared spectrum channel access, additional PDCCH monitoring opportunities can be configured in the UE's PO for paging monitoring. However, when the UE detects a P-RNTI-based PDCCH transmission in its PO, the UE does not need to monitor subsequent PDCCH monitoring opportunities in the PO.

[0131] To reduce power consumption, the UE can use DRX in RRC_IDLE and RRC_INACTIVE states. The UE monitors one PO per DRX cycle. A PO is a collection of PDCCH monitoring opportunities and may include multiple time slots (e.g., subframes or OFDM symbols) that can transmit paging DCI. A paging frame (PF) is a radio frame and may include one or more POs or the start of one or more POs.

[0132] In multi-beam operation, the UE assumes that the same paging message and the same short message are repeated in all transmission beams. The paging message is identical for both RAN-initiated and CN-initiated paging.

[0133] Upon receiving a paging request from the RAN, the UE initiates an RRC connection restoration procedure. When receiving a paging request from the CN while in the RRC_INACTIVE state, the UE transitions to the RRC_IDL state and notifies the NAS of the CN's paging request.

[0134] The PF and PO used for paging are determined as follows:

[0135] -PF's SFN is determined by the following formula:

[0136] (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N)

[0137] - The index i_s that indicates the index of PO is determined by the following formula:

[0138] i_s = floor(UE_ID / N) mod Ns

[0139] The following parameters can be used to calculate PF and i_s above.

[0140] -T: UE's DRX cycle (T is determined by the minimum of the UE-specific DRX value (if configured by RRC and / or upper layers) and the default DRX value broadcast in the system information. In RRC_IDLE state, if the UE-specific DRX is not configured by the upper layer, the default value is applied).

[0141] -N: Total number of paging frames in T

[0142] -Ns: Number of POs in PF

[0143] -PF_offset: The offset used to determine PF.

[0144] -UE_ID: 5G-S-TMSI mod 1024

[0145] Energy-saving channel design for UE in idle / inactive mode

[0146] In embodiments of this disclosure, a method is proposed to achieve energy savings using DCI transmitted within the search space monitored by an idle / inactive mode UE. Although the description focuses on DCI designs anticipated by an idle / inactive mode UE during CSS monitoring, these implementations can also be applied to DCI anticipated by a connected mode UE or DCI transmitted via USS, provided the inventive concept is maintained.

[0147] In LTE Rel-15 NB-IoT and MTC, a Wake-up Signal (WUS) is introduced to save UE power. A WUS is a signal that pre-indicates the presence of an actual paging transmission in a paging service block (SS) at a specific location. When the service block (BS) wants to send a paging signal in a point of origin (PO) at a specific location, the BS can send a WUS at the WUS transmission location associated with the PO. The UE monitors the WUS transmission locations associated with the PO at the specific location. If a WUS at a WUS transmission location is detected, the UE can expect to send a paging signal in the PO; if a WUS at a WUS transmission location is not detected, the UE can not expect a paging signal in the PO. This operation can achieve power saving gains. In LTE Rel-16 NB-IoT and MTC, UE group WUS is introduced to increase the power saving gains of Rel-15 WUS. By using the WUS transmission location and sequence determined based on the UE's UE group ID, UE group WUS can advantageously reduce the probability of unnecessary UE wake-ups.

[0148] Rel-16 NR introduces DCI-based power-saving technology to support power saving in connected mode. For this purpose, a new DCI format 2-6 is introduced. The BS indicates the bit positions in DCI format 2-6 used for UE monitoring to the UE, and the UE determines power-saving operations during active time intervals based on the bit information about those positions. DCI format 2-6 is intended for connected mode UEs; therefore, it is not defined for idle / inactive mode UEs. Furthermore, DCI format field configurations are not suitable for idle / inactive mode UEs, as they are dedicated to connected mode.

[0149] As discussed in Rel-16 NB-IoT and MTC, when a UE in idle / inactive mode monitors the paging search space, sending paging messages to other UEs sharing the same PO may cause unnecessary wake-ups, leading to increased UE power consumption. For example, when paging occurs for UE#1, UEs#2 through #N that are not being paging may unnecessarily perform PDSCH reception procedures (to receive the paging message), potentially harming power efficiency. Furthermore, since the PDSCH used for sending and receiving paging messages is likely scheduled in the same time slot as the PDCCH, it is necessary to prepare in advance to receive the PDSCH immediately after receiving the PDCCH, which may lead to unnecessary power consumption. For example, when paging occurs (e.g., a P-RNTI-based PDCCH is detected on the PO), UEs#1 through #N should all be prepared to receive the paging message carried by the PDSCH, given the potential possibility that the UE is the actual recipient of the paging message. Because PDCCH is more robust than PDSCH, the preparation operation for a UE to successfully receive PDSCH requires more time and power than the preparation operation for a UE to successfully receive PDCCH. This results in higher power consumption when the UE prepares for potential PDSCH reception compared to simply receiving PDCCH without preparing for PDSCH reception.

[0150] In one example of this disclosure, a DCI configured as described above for transmitting information about a particular channel will be defined as a P-DCI and described.

[0151] As an example of an application proposal, a method for transmitting information (e.g., paging) about channel B via channel / signal A (e.g., a PEI consisting of control channels such as DCI) in communication systems such as LTE and NR can be considered. Here, at least some of the following information may be included in the information about channel B transmitted via channel / signal A.

[0152] (1) Indicates whether to send information for channel B.

[0153] (2) Information about specific (or a specific number) UEs that need to acquire channel B.

[0154] (3) Information contained in channel B

[0155] Channel B can be a control channel (e.g., PDCCH) for the purpose of scheduling PDSCH / PUSCH or a data channel such as PDSCH / PUSCH. For example, channel B can be a PDCCH that transmits paging DCI in idle / inactive mode or a PDSCH that carries messages via paging DCI.

[0156] Figure 8 The BS operation according to an embodiment of the present disclosure is shown.

[0157] Reference Figure 8 The BS can generate configuration information related to channel / signal A (e.g., P-DCI) and transmit it (FC101). For example, higher-layer signals (e.g., SIB or RRC signaling) can be used to transmit the configuration information related to channel / signal A.

[0158] The BS can generate and transmit channel / signal A (e.g., P-DCI) (FC102) based on channel / signal A related configuration information. For example, when channel / signal A is P-DCI, the BS can generate channel / signal A (e.g., P-DCI) that includes UE group ID information, cell ID information, short message related information and / or PDSCH scheduling information.

[0159] The BS can transmit a channel / signal A (e.g., P-DCI) generated at a location (e.g., search space) where a transmittable channel / signal A (e.g., P-DCI) can be located, based on configuration information.

[0160] The BS may transmit channel / signal B (FC103) at a location relating to the information included in the transmitted channel / signal A (e.g., P-DCI). For example, signal B may be a reference signal (e.g., DMRS, CSI-RS / TRS), and channel B may be a PDCCH for scheduling paging messages or a PDSCH containing paging messages.

[0161] Figure 9 The UE operation is illustrated in an example of the present invention.

[0162] The UE can receive configuration information related to channel / signal A (e.g., P-DCI) to perform operations for channel / signal A (e.g., P-DCI) (FC201). For example, the UE can use higher-layer signals (e.g., SIB or RRC signaling) to receive the configuration information.

[0163] The UE can anticipate and monitor channel / signal A (e.g., P-DCI) (FC202) based on configuration information. For example, the BS can anticipate information including UE group ID information, cell ID information, short message related information, and / or PDSCH scheduling information through channel / signal A (e.g., P-DCI). The UE can also monitor channel / signal A (e.g., P-DCI) generated at locations (e.g., search space) where channel / signal A (e.g., P-DCI) can be transmitted, based on the above configuration information.

[0164] If the UE successfully detects channel / signal A (e.g., P-DCI) during a monitoring operation and is instructed to monitor channel / signal B (FC202), the UE may monitor channel / signal B at a location associated with the transmitted channel / signal A (FC203). For example, signal B may be a reference signal (e.g., DMRS, CSI-RS / TRS), and channel B may be a PDCCH used for scheduling paging messages or a PDSCH containing paging messages.

[0165] In embodiments of this disclosure, some of the following methods may be selected and applied. These methods may operate independently without being combined individually, or they may be operated in a manner that combines and connects one or more methods. Some terms, symbols, orders, etc. used in the description of this disclosure may be replaced with other terms, symbols, orders, etc., as long as the principles of this disclosure are maintained.

[0166] In the following embodiments, arbitrary structures for transmitting and receiving channel / signal A and channel / signal B are illustrated as examples to illustrate the principles of this disclosure. However, it should be noted that, unless otherwise stated, the proposed methods do not specify or limit the transmission and reception types of channel / signal A or channel / signal B. Therefore, those skilled in the art will understand that the proposals in this specification can be applied to all structures for transmitting and receiving channel / signal A (e.g., P-DCI) unless they contradict the principles of this disclosure.

[0167] The following embodiments are illustrated based on NR systems to explain the principles of this disclosure; however, it should be noted that, unless otherwise stated, the proposed methods do not specify or limit the NR transmission and reception types. Therefore, those skilled in the art will understand that the proposed methods can be applied to all wireless communication transmission and reception structures unless they contradict the principles of this disclosure.

[0168] (Proposal 0) Configure a field in P-DCI that contains group / subgroup information about the UE.

[0169] In an example of the present disclosure, a method for determining / indicating a group / sub-group of UEs (hereinafter referred to as "UE group") in an idle / inactive mode for monitoring P-Os based on P-DCI is proposed. For example, it may include a method of configuring a field for indicating a UE group in P-DCI as in Proposal 0. For simplicity, in an example of the present disclosure, the DCI field / information for indicating a UE group will be defined as "UG field" and described.

[0170] The UG field may be configured in the form of a bitmap. When the UG field consists of N bits, the UE can pre-identify the bit positions corresponding to its UE group among the N bits. The UE can determine whether the corresponding P-DCI is related to its UE group (e.g., whether the information of the UE group is included in the corresponding P-DCI or will be sent after the P-DCI) by checking the binary value of 0 / 1 as its bit among the N bits.

[0171] (Proposal 0-1) UE Group Operation Scheme

[0172] For the UE group operation scheme proposed in an example of the present disclosure, one or more methods in Proposal 0-1-A or Proposal 0-1-B can be combined and used. For the UE group operation scheme described in the following disclosure, unless it violates the principle of the present disclosure, one of the methods described in Proposal 0 can be used and can be extended and applied to the UE group configuration method of another scheme.

[0173] (Proposal 0-1-A) Operations to be performed when one or more POs can correspond to / be associated with a single P-DCI.

[0174] For example, it is proposed to use / include the P-O information of the UE (e.g., the location information about the P-O) when determining the UE group of the UE.

[0175] One or more P-Os can be designed / operated to correspond / associate with one P-DCI. A P-DCI is not necessarily constrained to have a 1:1 correspondence with one P-O, and a common P-DCI can be used for N P-Os (where 0 < N < the maximum number of P-Os). For example, referring to Figure 10 , four P-Os, P-O #1, #2, #3, and #4 correspond / associate with one P-DCI. Using the method proposed in Proposal 0-1-A, the P-DCI can be used to provide wake-up information about the UE, and the network overhead for P-DCI transmission can be saved.

[0176] The P-DCI can be used to indicate the actually enabled P-O among one or more P-Os corresponding / associated with the P-DCI (e.g., the P-O that needs to monitor the paging DCI).

[0177] When the UE group has a 1:1 correspondence with the P-O, for example, when different UE groups are assigned to each P-O, enabling the P-O through the P-DCI can be understood as enabling the UE group corresponding to the P-O.

[0178] Alternatively, when multiple UE groups are associated with a single PO, a UE group can be understood as a subgroup of UEs within a PO, as described later in Proposal 0-1-B. Alternatively, N UE groups may correspond to M POs. To avoid obscuring the subject matter, the following description will assume a one-to-one correspondence between UE groups and POs, which is the simplest example.

[0179] As an example, such as Figure 14 As shown, the UE can calculate its UE group ID (D05) and check whether the PO enabled via P-DCI corresponds to the UE group ID (D15) based on the calculated UE group ID. The UE can check whether the PO associated with its UE group is enabled via P-DCI.

[0180] As an example of UE group ID calculation, a UE can calculate its UE group ID based on information related to its PO (or parameters used to determine the PO) and the number of POs corresponding to a P-DCI.

[0181] When the P-DCI detection (D10) is successful, the UE can check the index of the enabled PO (D15). When the UE identifies that a PO associated with the UE group to which the UE belongs has been enabled, the UE can determine to monitor the paging DCI (D20) for the location determined by the P-DCI in the PO (to be monitored or associated with the P-DCI) (e.g., the location of the enabled PO indicated by the P-DCI).

[0182] When the BS has paging information (e.g., paging PDSCH and / or short message) to send, the BS may send a P-DCI that includes information about the UE group receiving the paging information at the location (e.g., bit position within the P-DCI) corresponding to the PO to which the paging information is to be sent.

[0183] To execute Proposal 0-1-A, the UE may need information about the number of POs corresponding to a P-DCI. This information (or the method for determining the number of POs) may be fixed / defined according to a standard, or the BS may set / signal the number of POs corresponding to a P-DCI (DO1) via higher-layer signaling.

[0184] (Proposal 0-1-B) Include subgroups of UEs monitoring the same PO in the UE group determination.

[0185] A method for subgrouping and distinguishing UEs monitoring the same PO is proposed for UE groups. The UE can calculate the UE group ID using its UE ID and / or information configured from the BS, and can operate by checking the ID of the enabled UE group upon successful detection of a P-DCI. When the UE determines that the UE group to which it belongs has been enabled, the UE can perform subsequent operations for receiving a PDSCH to send a paging message. In this case, the subsequent operations for receiving the PDSCH may include monitoring the paging DCI on the PO corresponding to the P-DCI, or performing PDSCH reception based on received PDSCH scheduling information. To this end, when the BS has paging information to send, it can be configured to send a P-DCI, which includes enabling information about the UE group receiving the paging information at the transmission location of the P-DCI to be sent (e.g., the PO or the P-DCI transmission search space corresponding to the PO).

[0186] To implement Proposal 0-1-B, the UE may need information about the number of UE groups used to distinguish UEs monitoring the same PO. This information may be fixed according to standards, or it may be a value configured by the BS via higher-layer signaling.

[0187] By using the method proposed in Proposal 0-1-B, the impact of unnecessary UE wake-up due to paging of other UEs monitoring the same PO can be reduced when the UE does not need to obtain paging information.

[0188] (Proposal 0-2) Determine the UE group of the UE.

[0189] As an example of the method for determining a UE group presented in this disclosure, a combination of one or more methods from Proposal 0-2-A or Proposal 0-2-B disclosed below may be used for the UE group described below, and can be extended and applied to other UE group configuration methods unless the principles of this disclosure are violated.

[0190] (Proposal 0-2-A) Use the UE ID to generate the UE group ID.

[0191] A method is proposed to determine the UE group ID for P-DCI using the UE's unique UE ID. In NR, the UE uses its UE ID (which is calculated using 5G-S-TMSI) to determine the PO when performing a paging operation. In similar operations, the value of the UE ID and the total number of UE group IDs can be used as a method for the UE to determine the unique UE group ID. As a specific example, Equation 1 can be used as a method to determine the UE group ID (hereinafter, UE_G_ID) for the UE ID, so that UEs monitoring the same PO are allocated at the same ratio.

[0192] [Formula 1]

[0193] UE_G_ID=floor(UE_ID / N / Ns)mod N G

[0194] In Equation 1, N and Ns represent the total number of paging frames in T and the number of paging opportunities used for PF, respectively (see, for example, Section 7.1 of TS 38.304). G N represents the total number of distinguishable UE groups within the UE group corresponding to a PO. G The value can be determined by the rules predefined by the standard, or it can be information broadcast via higher-level signaling such as SIB.

[0195] Therefore, the UE can calculate its UE_G_ID using the UE ID according to predetermined rules, as in the example above, and use it to detect the P-DCI. When the UE successfully detects the P-DCI and determines that the UE group to which the UE belongs has been enabled, the UE can perform subsequent operations for receiving the PDSCH for sending paging messages. In this case, the subsequent operations for receiving the PDSCH may include monitoring the paging DCI on the PO corresponding to the P-DCI or performing PDSCH reception based on the received PDSCH scheduling information. To this end, when the BS has paging information to send, it can calculate the UE_G_ID based on the target UE ID and be configured to determine to send the P-DCI, which includes enabling information about the UE group receiving paging information at the transmission location of the P-DCI to be sent (e.g., the PO or the P-DCI transmission search space corresponding to the PO).

[0196] Using the method proposed in Proposal 0-2-A, the BS and UE can be configured to calculate the same information about the UE's UE_G_ID, even without separate dedicated signaling for a specific UE. This saves network overhead caused by higher-layer signaling.

[0197] (Proposal 0-2-B) Use a separate configuration to generate UE group IDs.

[0198] When there are separate configurations between the UE and the BS, it is proposed that the UE group ID used in P-DCI be determined using separate configurations. Separate configurations may include RACH procedures performed by the UE in idle / inactive mode or report / request procedures performed by the UE in connected mode, and may include configuration procedures provided by the BS (or higher-layer nodes).

[0199] As a concrete example of Proposal 0-2-B, the UE can be configured to determine how to interpret information included in its UE_G_ID and / or P-DCI based on information separately indicated by the BS. For example, when UE_G_ID is indicated, the UE can determine and use the location of the UE group bitmap field corresponding to UE_G_ID. Alternatively, the BS can provide the UE with information about bit regions within the P-DCI that are meaningful to the UE (e.g., the starting bit index and bit size that the UE should monitor).

[0200] Therefore, the UE can be configured to provide reports or requests that include information related to the UE. This information may be used by the BS to obtain information related to P-DCI, or the report / request may be used for other purposes for P-DCI purposes. Subsequently, the UE can obtain configuration information from the BS that can be used for P-DCI and perform P-DCI monitoring operations based on this information.

[0201] To this end, the BS can configure P-DCI-related information for the UE based on report / request information received from the UE. This operation can be performed by a node higher than the BS, and the BS can be configured to perform P-DCI operations based on information provided by higher-level nodes.

[0202] Using the method proposed in Proposal 0-2-A, the BS (or higher-level node) can take into account the characteristics of the UE and the network to make the UE's energy-saving operation efficient.

[0203] In the following implementation, even if there is no separate description, the method proposed in Proposal 0 can be applied to the operation indicated by the described UE group.

[0204] (Proposal 1) Energy-saving method for sending and receiving PS-DCI before sending and receiving paging DCI.

[0205] In embodiments of this disclosure, a method is proposed for configuring a P-DCI to be sent / received before the time of sending / receiving a paging DCI. In the following description, the P-DCI sent and received in this configuration is referred to as a PS-DCI. Figure 11 An example of the PS-DCI transmission / reception time considered in Proposal 1 is illustrated schematically. When a separate PS-DCI is configured as in Proposal 1, energy-saving operations can be performed without significantly affecting the transmission of paging DCI. Paging can be used for system information changes, disaster notifications, UE calls, etc., and it is important to ensure that backward compatibility with legacy UEs is not affected, as it is designed for multiple UEs to monitor the same paging DCI simultaneously. When a separate PS-DCI is configured to provide energy-saving benefits to some UEs monitoring paging as suggested in Proposal 1, the UEs can obtain energy-saving benefits through the PS-DCI, and the paging DCIs monitored by other UEs that are not expected to save energy can operate in the same manner.

[0206] (Proposal 1-1) Include short messages to be sent in paging DCI in PS-DCI.

[0207] The inclusion of short messages in the PS-DCI is proposed. As an example of short messages included in the PS-DCI, it is proposed that short messages to be sent in the paging DCI be included in the PS-DCI. Short messages included in the PS-DCI can be determined based on at least a portion of the short messages to be sent in the paging DCI. Short messages included in the PS-DCI can be identical to at least a portion of the short messages to be sent in the paging DCI.

[0208] The short messages in the current NR standard can be used in paging DCI to provide BCCH modification information (systemInfoModification) or ETWS / CMAS notification (etwsAndCmasIndication), or to instruct PDCCH monitoring to stop within PO (stopPagingMonitoring).

[0209] Information in the short message can indicate that additional information is not included in the PDSCH carrying the paging message. Therefore, when the UE can determine through PS-DCI that the information to be received / expected does not exist in the PDSCH, it can skip the operation of re-detecting the paging DCI to check the short message.

[0210] In the current standard, paging DCI is transmitted based on P-RNTI, and all UEs sharing the P-RNTI in the cell attempt to detect the paging DCI on the PO and receive the short message included in the paging DCI. Since the short message on the PDCCH carries cell-wide information (e.g., system information changes, ETWS / CMAS, etc.) (different from the paging message on the UE-specific PDSCH), it may be desirable for UEs other than the recipient to receive the short message. In this case, when subgroups of UEs sharing the same PO are executed, and as described above, only some subgroups are woken up via PS-DCI to detect the PO (i.e., receive the paging DCI), the remaining subgroups' UEs may skip not only the PDSCH containing the paging message but also the reception of the paging DCI (PDCCH) containing the short message. For short message transmission, transmitting P-DCI and paging DCI separately for each subgroup may reduce energy efficiency and increase signaling overhead. PS-DCI can be used as a method to solve the short message skipping problem in UE subgroups. When PS-DCI has a short message, even if PO monitoring is skipped, the UEs (all subgroups) that are detecting PS-DCI can at least detect the short message. Furthermore, the PS-DCI scheme allows ETWS / CMAS commands to be sent as quickly as possible in various ways during disaster / emergency situations.

[0211] Therefore, as in Proposal 1-1, a method is proposed to include information about the entire or part of the short message in the PS-DCI to increase the energy-saving benefits for the UE.

[0212] The short message field size currently configured in the paging DCI of NR is 8 bits, and up to 3 bits of information can be used based on Rel-16 NR. In embodiments of this disclosure, when a PS-DCI including short message information of the paging DCI is sent, the size of the short message field configured in the PS-DCI and the type of information included are proposed as in Proposal 1-1-A.

[0213] Figure 15 This is an example of the implementation of UE operations related to PS-DCI. (See reference...) Figure 15 The UE receives the PS-DCI (E05) containing the short message and obtains the short message (E10) by decoding. The UE can perform subsequent operations based on the instructions in the short message (e.g., refer to the above description including system information updates). The UE can obtain the short message from the PS-DCI regardless of whether its PO (or subgroup) is enabled in the PS-DCI.

[0214] The UE performs an enable check (E15) to determine whether its PO (or subgroup) is enabled. When the PO is enabled, the UE can monitor the PO based on P-RNTI (E20) and detect the paging DCI (E30). The paging DCI may include short messages. Short messages included in the paging DCI may be related to short messages included in the PS-DCI.

[0215] (Proposal 1-1-A)

[0216] As a concrete example of Proposal 1-1, a method can be used to configure an N-bit short message field in the PS-DCI. Here, N can be a value that satisfies the condition N≤8. In this case, some bits in the short message field of the PS-DCI can contain all or part of the information contained in the short message field of the paging DCI, and some other bits can be considered as reserved state. When the value of N is small, the overhead of the PS-DCI can be reduced, thus improving the reliability of PDCCH decoding. On the other hand, when the value of N is large, the number of bits available in the reserved state can be increased. Bits in this state may be advantageous in terms of forward compatibility with additional information to be introduced later into the short message field of the paging DCI.

[0217] As an example of using Proposal 1-1-A, the UE can be configured to expect information included in the short message that the UE can anticipate in paging to be included in the short message field of the PS-DCI. For example, based on Rel-16 NR, the short message field of the paging DCI can consist of 8 bits, and the information that the UE can anticipate from this field can be up to 3 bits of systemInfoModification, etwsAndCmasIndicataion, and stopPagingMonitoring, with the remaining bits all considered reserved states. When applying the proposed example, based on Rel-16 NR, the UE can be configured to anticipate the same 3 bits of information that can be anticipated in the short message via the paging DCI in the field corresponding to the short message in the PS-DCI, and to treat the remaining (N-3) bits as reserved states.

[0218] Alternatively, only 2 bits of systemInfoModification and etwsAndCmasIndicataion can be included in the short message field of PS-DCI, and the remaining N-2 bits can be considered reserved. Since 1 bit of stopPagingMonitoring was introduced in Rel-16 and is primarily used to support extended POs to allow multiple PDCCHs in NR-U to monitor occupancy, PS-DCI may not support stopPagingMonitoring if not needed.

[0219] The example above describes operation based on Rel-16 NR. Even when information is added to a short message and the UE can anticipate the L-bit information in the short message field of the paging DCI, the UE can also anticipate the L-bit information in the short message area of ​​the PS-DCI and treat the remaining NL bits as reserved.

[0220] Alternatively, when using Proposal 1-1-A, the UE can be configured to anticipate additional information provided by the PS-DCI in the short message field of the PS-DCI, as well as the same information configuration as the short message the UE can anticipate in paging. In this case, the additional information can be configured such that its size and information can be configured via higher-layer signaling such as SIB or RRC messages. For example, based on Rel-16 NR, the UE can anticipate up to 3 bits of information in the PS-DCI that can be anticipated in the short message of the paging DCI, and additional information that the Rel-16 NR UE cannot anticipate can be configured via RRC messages. When the size of the additional information is set to M bits, the UE can anticipate that the information exists in (3+M) bits of the short message field of the PS-DCI, and treat the remaining N-(3+M) bits as reserved bits. In this case, when the RRC message does not contain configuration information about the additional information, the UE can anticipate that the short message field in the PS-DCI will be configured with the same configuration as the paging DCI. When the information is later added to the short message, and the UE can expect a total of L bits of information in the short message field of the paging DCI, the operation described in the Rel-16 NR example above can also be applied. When L bits of information are provided in the short message of the paging DCI, the UE can expect that information to exist in (L+M) bits in the short message field of the PS-DCI, and treat the remaining "N-(L+M)" bits as bits in a reserved state.

[0221] When using Proposal 1-1-A, the size N of the short message field configured in the PS-DCI can have a value indicated by higher-layer signaling. This configuration aims to reduce DCI overhead by minimizing reserved state bits, while increasing size N to include additional information in the short message of the paging DCI when additional information is later introduced into the short message of the PS-DCI. As a method of indicating N, a separate indicator for N can be introduced to explicitly express N via higher-layer signaling. Alternatively, when an indicator for the configuration (or size) of the short message content of the paging DCI exists, it can be used, making N implicitly estimable.

[0222] Alternatively, when using Proposal 1-1-A, the size N of the short message field configured in the PS-DCI can have a fixed value according to the standard. This configuration simplifies UE operation without incurring additional overhead. As an example of a fixed N size, Proposal 1-1-Aa or Proposal 1-1-Ab disclosed below can be applied. The following example is one of the implementation methods used for description, and the principles of this disclosure can also be applied even when other values ​​of N are used.

[0223] (Proposal 1-1-Aa) As a concrete example of Proposal 1-1-A, an 8-bit Short Message field equal to the size of the Paging DCI can be configured in the PS-DCI. This can be an advantageous structure for ensuring forward compatibility, allowing the PS-DCI to support bits that are currently unused and reserved, if determined to be used in future versions. Given N=8, the same effect as with the Paging DCI can be expected in terms of forward compatibility, since the PS-DCI's Short Message field has the same size as the Paging DCI's Short Message field.

[0224] (Proposal 1-1-Ab) As a concrete example of Proposal 1-1-A, the 2-bit short message field in the paging DCI, excluding the reserved state, can be configured in the PS-DCI. This can be a favorable structure for reducing the size of the PS-DCI to decrease PDCCH transmission overhead or improve PDCCH decoding reliability.

[0225] As described above, up to 3 bits of short messages can be configured in Rel-16 NR-based short messages. Two of these bits can be used for systemInfoModification and etwsAndCmasIndication, respectively, and can be information required by the UE for all service types. Additionally, these 2 bits include information not associated with subsequent PDSCH. Therefore, when these 2 bits are included in the PS-DCI short message field, energy savings can be achieved if the UE does not expect information from subsequent PDSCH. On the other hand, the remaining 1 bit (i.e., stopPagingMonitoring) is mainly used to indicate that, considering the characteristics of NR-U, the UE does not need to monitor subsequent PDCCH for blocking, which is an additional operation introduced in Rel-16 NR. Therefore, to reduce overhead, the 1 bit indicating stopPagingMonitoring may not be included in the PS-DCI short message field. The PS-DCI short message field can be configured based on the 2 bits used for systemInfoModification and etwsAndCmasIndication. Alternatively, the PS-DCI short message field can be determined as 3 bits via higher-layer signaling. In a specific example of determining the number of bits via higher-level signaling, an explicit indicator can be used to determine whether it is 2 or 3 bits. Alternatively, 3 bits may be applied only if stopPagingMonitoring can operate meaningfully (i.e., configuring nrofPDCCH-MonitoringOccasionPerSSB-InPO). In another case, 2 bits may be applied.

[0226] From the receiver's perspective, when known bits exist during the decoding of the channel-coded signal, benefits such as improved decoding reliability can be obtained depending on the receiver implementation. To enhance this benefit, rules such as Proposal 1-1-B have been proposed when configuring the short message field in the corresponding PS-DCI and paging DCI, so that a UE that has successfully decoded the PS-DCI can use the decoded short message information to decode the paging DCI.

[0227] (Proposal 1-1-B)

[0228] As a concrete example of Proposal 1-1, corresponding PS-DCI and Paging DCI can be configured such that bits indicating the same information in the short message field always express the same state. In this case, according to the design of the PS-DCI, bits indicating the same information can represent information included in both the PS-DCI and Paging DCI short message fields. Based on Rel-16NR, this information may include systemInfoModification, etwsAndCmasIndication, and / or stopPagingMonitoring. This configuration can be intended to use the decoding result value of the PS-DCI to decode the corresponding Paging DCI when the UE successfully decodes the PS-DCI. Information included in the short message regarding BCCH modification and ETWS / CMAS notifications may be information that must be broadcast continuously for a period of time without instantaneous change. Therefore, in general, information with similar characteristics to the above information can be expected to maintain the same value between the PS-DCI and Paging DCI. When it can be assumed that the information is the same between the two DCIs as in the proposed method, the UE can be allowed to use it to improve the decoding reliability of the PDCCH that transmits the Paging DCI or to check for false alarms.

[0229] The method proposed in Proposal 1-1-B is scalable and applicable to bit regions corresponding to reserved states. When there are reserved bits in the short message field of the PS-DCI, the same method can be applied to assume that the PS-DCI and Paging DCI have the same value. When the size N of the PS-DCI short message field is smaller than the size of the Paging DCI short message field (i.e., N < 8), N sequence numbers can be configured into a set based on the sequence numbers assigned within the Paging DCI short message, and this set can be included in the PS-DCI short message field. For example, it can be assumed that short messages 1 to N, assigned based on index 1 (i.e., systemImpoModification), exist in the PS-DCI short message field within the sequence of Paging DCI short messages.

[0230] One characteristic to consider when using the method proposed in Proposal 1-1-B is that there may be a modification period boundary for updating SI messages between the time of sending the PS-DCI and the time of sending the paging DCI. The modification period is a unit of time used to notify the broadcast of SI message updates, excluding ETWS, CMAS, and location assistance data. When systemInfoModification indicates a SI change, the UE can assume that an SI update will be performed in the next modification period. Therefore, when the PS-DCI and paging DCI are in different modification periods, it is necessary to define a DCI as the basis for determining the value of the systemImpoModification information to facilitate the application of the method in Proposal 1-1-B. As one way to address this issue, the information in the short message contained in the PS-DCI can be determined based on the information in the short message to be sent in the corresponding paging DCI. For example, when an SI update is scheduled in a modification period that includes the time when a specific paging DCI will be sent, and is not scheduled in the next modification period, the systemImpoModification included in the short message field of the paging DCI can indicate 0 regardless of the transmission time, and the systemImpoModification of the corresponding PS-DCI can be set to 0.

[0231] When using the PS-DCI structure proposed in Proposal 1, the UG field proposed in Proposal 0 can be included in the PS-DCI to increase the UE's energy-saving gain. In embodiments of this disclosure, when the short message information of the paging DCI and the UG field are configured together in the PS-DCI, as proposed in Proposal 1-1-C with the UG field configured.

[0232] (Proposal 1-1-C)

[0233] As a specific example of Proposal 1-1, when the size of the short message field configured in the PS-DCI is N and the actual number of short messages used is L, the (NL) bits reserved for short messages in the short message field can be used to present other information (hereinafter, additional information). Specifically, the additional information may include UE group indication.

[0234] Within the NL bits, the bits used for adding information can be M (≤NL) bits, and the size of M can be configured by the BS. In this case, the UE can use L bits for the short message and M bits for the added information in an N-bit short message, and can assume that the remaining (NLM) bits are reserved bits. As a more specific example, when the bits constituting the short message field have an index, the short message field can be configured such that the L-bit short message, the (NLM)-bit reserved bits, and the M-bit added information are arranged in this order. Figure 12An example of the proposed method is illustrated when N=8. This method is designed to support UEs with different short message messages that expect the same DCI. This can facilitate backward compatibility, supporting features that can be introduced in future versions without conflict.

[0235] Implementation example of proposal 1-1

[0236] The following description illustrates an example of configuring PS-DCI by applying Proposal 1-1. The following example is a limiting form of the techniques proposed in this disclosure, and the methods proposed in this disclosure can be applied in various situations beyond the described examples.

[0237] As an example of Proposal 1-1, P-DCI can be used to provide / obtain information about NR paging transmission and reception. In this case, the information configured in P-DCI may include UE group indications and short messages. In this case, the size of the short message field configured in PS-DCI is N, and can be configured / signaled by the BS to a value less than or equal to 8. For example, the size of the short message field included in PS-DCI can be configured by the network. As a configuration method, explicit signaling or implicit signaling can be used. For example, the size of the short message field can be inferred based on a given parameter.

[0238] The network can use signals to inform about the full size, field configuration, or DCI format of the P / PS-DCI (e.g., multiple DCI formats for the P / PS-DCI to reduce the overhead of blind detection) (and simultaneously signal the size of the short message field in the PS-DCI).

[0239] The UE can interpret the N bits used to interpret the short message information that are available to the UE. UE Bits. When N > Nue, it can be assumed that the remaining NN UEThe bits are reserved. Additionally, the size of the UG field configured in the PS-DCI can be M, and a structure configurable by the BS can be used. The UG field can be configured as an M-bit bitmap. Each bit can correspond to a UE group ID and can be used to indicate whether PDSCH scheduling for each UE group ID is expected on the PO corresponding to the received PS-DCI transmission. To support the above operations, the BS can indicate the supportability of the PS-DCI and the sizes of N and M via higher-layer signaling such as SIB. Subsequently, when there is a short message to be sent or a paging message to be sent to the UE, the BS can determine the PO to send the information and send the information during the PS-DCI transmission corresponding to the PO. To support the above operations, the UE can obtain the supportability and configuration information of the PS-DCI via higher-layer signaling such as SIB. Afterward, the UE can monitor the PS-DCI at a predetermined transmission location. When the UE successfully detects the PS-DCI and is instructed to perform short message-related operations, the UE can perform corresponding subsequent operations according to predetermined rules. Additionally, when a UE successfully detects a PS-DCI and determines that PDSCH scheduling information for its UE_G_ID can be expected in the UG field, the UE may attempt to detect a paging DCI at the location of the PO corresponding to the detected PS-DCI. However, if the UE identifies that PDSCH scheduling cannot be expected in the bitmap area corresponding to its UE_G_ID, the UE may determine that it does not need to attempt to detect a paging DCI at the location of the corresponding PO, even if the UE successfully detects a PS-DCI. Figure 13 This diagram illustrates an example of DCI field configuration when the above example is applied with N=8 and M=8. The example in the diagram shows the UE's ability to send three short messages, thus assuming five bits are reserved bits. Figure 13 In the example, assuming the UE's UE_G_ID is 3, the UE uses the third bit in the UG field.

[0240] (Proposal 1-2) Include short message indicators to be sent in paging DCI in PS-DCI.

[0241] One example of this disclosure proposes a method, as in Proposal 1-2, to include an indication of the short message to be sent in the corresponding paging DCI within the PS-DCI. The paging DCI defined in the NR standard has a 2-bit short message indicator. This short message indicator is used to dynamically indicate whether a short message is included in the paging DCI that sends PDSCH scheduling information. When the BS has no short message information to send, the BS can use the short message indicator to disable the short message field. In this case, the UE can operate by treating the short message field as a reserved bit based on the received short message indicator information. Similarly, even when a short message field is configured in the PS-DCI, there may be times when there is no short message information to be sent by the BS. Considering this situation, one example of this disclosure proposes a dynamic indication method similar to that of the paging DCI, as in Proposal 1-2, which introduces a short message indicator in the PS-DCI.

[0242] When the size of the Short Message Indicator field configured in the paging DCI of the NR is 2 bits, the bits 01, 10, and 11 representing the state of the Rel-16NR-based bit field are used to indicate "only paging scheduling information exists in the DCI", "only short messages exist in the DCI", and "both paging scheduling information and short messages exist in the DCI", respectively, and 00 is set to a reserved state. In embodiments of this disclosure, as proposed in Proposal 1-2-A, an operation method is provided when the size of the Short Message Indicator field included in the PS-DCI, such as the paging DCI, is configured to be 2 bits.

[0243] (Proposal 1-2-A)

[0244] As a concrete example of Proposal 1-2, a 2-bit Short Message Indicator field can be configured in the PS-DCI. This 2-bit Short Message Indicator can have the same size as the Short Message Indicator configured in the Paging DCI and can be designed to support the same operations as the Paging DCI to utilize all four states in total, or support new Short Message Related Operations for the Paging DCI, which may be introduced later based on forward compatibility. A concrete example of Proposal 1-2-A can be a combination of one or more of the following Proposals 1-2-Aa, 1-2-Ab, and 1-2-Ac.

[0245] (Proposal 1-2-Aa) As a specific example of Proposal 1-2-A, the 2-bit short message indicator used in PS-DCI can be used to indicate the presence of a short message and whether it includes information related to paging scheduling. Table 5 shows an example of Proposal 1-2-Aa in tabular form. The information that can be presented through the short message indicator in PS-DCI can be the same as the information that can be presented through the short message indicator in Paging DCI.

[0246] As a concrete example of Proposal 1-2-Aa, the UE can be configured not to anticipate a 2-bit indicator indicating a "00" state. This is the same operational definition as in the case where the short message indicator for paging DCI indicates a "00" state. This configuration may be beneficial in terms of backward compatibility for operations that reflect future use of the "00" state in short message indicators for paging DCI. When the BS knows that the UE, as the target of a paging message or short message, does not anticipate a "00" state, it can use a state other than "00" to determine the information of the short message indicator.

[0247] As a concrete example of Proposal 1-2-Aa, when the 2-bit indicator indicates a "01" state, the UE can be configured not to expect short message information to be carried in the short message field of the PS-DCI. In this case, the UE can expect information that can be carried in fields other than the short message field in the PS-DCI (e.g., the UE_G_ID indicator) to be included in the DCI. In this case, the UE can assume that the bits of the short message field are in a reserved state. This can be intended to define the same operation as when the short message indicator of the paging DCI is in a "01" state, to equally support the operation in the paging DCI case and increase forward compatibility when new operations are introduced in the future. Alternatively, the bits of the short message field can be used to indicate information for other purposes. For example, a region of the short message field can be used to provide information for indicating UE groups. When there is a separate field configured in the PS-DCI to indicate the UE_G_ID, the bits in the short message field can be used to further subdivide UE groups. This configuration can increase the transmission efficiency of control data by using the reserved bits for another purpose. Additionally, this configuration can be advantageous in terms of energy saving when another objective is UE grouping, as unnecessary wake-up operations of UEs can be reduced by subdividing UE groups.

[0248] As a specific example of Proposal 1-2-Aa, when the 2-bit indicator indicates a "10" state, the UE can be configured to assume that the PS-DCI contains short message information, and can also be configured not to anticipate (or be configured to identify that no monitoring is required) the transmission of paging DCI corresponding to the PS-DCI transmission. In this case, the UE can recognize that the short message is included in the short message field contained in the PS-DCI and interpret the short message information according to predetermined rules. Here, the predetermined rules for the information carried in the short message field can be one of the methods proposed in Proposal 1-1.

[0249] As a specific example of Proposal 1-2-Aa, when the 2-bit indicator indicates a "11" state, the UE may assume that the PS-DCI contains short message information and that the PS-DCI contains information that can be carried in fields other than the short message field (e.g., UE_G_ID indication). When the information that can be carried in another field is related to UE_G_ID, and the UE is instructed to monitor the paging DCI for the UE's expected UE_G_ID, the UE may check the information contained in the short message field and monitor the PO corresponding to the PS-DCI transmission. When the information that can be carried in another field is related to UE_G_ID, and monitoring of the paging DCI for the UE's expected UE_G_ID is disabled, the UE may check the information contained in the short message field and assume that it is not necessary to monitor the PO corresponding to the PS-DCI transmission. Here, the information carried in the short message field may be determined according to one of the methods proposed in Proposal 1-1.

[0250] According to Proposal 1-2-Aa, the configuration and operation of the short message indicator configured in the PS-DCI are the same as or similar to the configuration and operation of the short message indicator configured in the paging DCI. Furthermore, when methods for operating short messages in the paging DCI are added in the future, it may be easy to add the same / similar operations to the PS-DCI.

[0251] [Table 5]

[0252] Bit field SMS indicator 00 Reserved 01 The DCI only contains scheduling information for paging. 10 Only short messages exist in DCI. 11 DCI contains both scheduling information and short messages used for paging.

[0253] (Proposal 1-2-Ab) As a specific example of Proposal 1-2-A, the information that may be included in the short message field contained in the PS-DCI can be divided into three groups, the size of which can be determined by the state of the 2-bit short message indicator. For example, the information in the three groups can be the actual short message, the UE group indicator, and Info_Others. Here, the actual short message refers to the bits in the short message field used to provide short message information, and Info_Others refers to the set of information that can be carried in the short message field other than the short message and UE group indicator information. Table 6 shows a specific example of applying Proposal 1-2-Ab when the short message field is N bits. In the example in Table 6, A, A', B, and B' can have any integer values, and A, B, and A'+B' can all be less than N. Here, A, A', B, and B' can have values ​​predetermined by the standard, or they can be values ​​configured by higher-layer signaling such as SIB. In the example in Table 6, different symbols are used to indicate the bit size for descriptive purposes. However, the proposed method can be applied even when two or more of A, A', B, and B' have the same value.

[0254] In Proposal 1-2-Ab, a specific example of the configuration of the bit field for actual short message purposes can be a combination of one or more methods proposed in Proposal 1-1. When the UE determines through PS-DCI detection that the size of the bit field for actual short message purposes is 0 bits, short message-related operations are no longer expected. When the UE determines through PS-DCI detection that the size of the bit field for UE group indication is 0 bits, the UE is no longer expected to schedule PDSCH transmission in the paging DCI corresponding to the PS-DCI.

[0255] In Proposal 1-2-Ab, the information type and size of each message contained in the bit field for Info_Others can be determined by the state of the Short Message Indicator (SMI) symbol. This is suitable for maximizing the amount of information that can be transmitted through Info_Others as needed, while ensuring the amount of information for two different types (i.e., actual Short Messages and UE group indications). Furthermore, when the size of the bit field allocated to Info_Others is C1 bits and the maximum amount of information the UE can expect from Info_Others in any state of the SMI symbol is C2 bits, the UE can assume that the remaining unused C1-C2 bits in the Info_Others bit field for information provision purposes are reserved bits. This configuration is suitable for determining the interpretation rules for bits that the UE does not expect and considers forward compatibility to prepare for future expansion of the C1-C2 bit field for other purposes.

[0256] When using Proposal 1-2-Ab, information related to the UE group indication (hereinafter referred to as Information A) is configured separately in a bit field outside the Short Message field, and the size of the UE group indication bit field in the Short Message field is not zero (hereinafter referred to as Information B). The UE group indication information can be composed of a combination of Information A and Information B. For example, if each bit can distinguish one UE group, Information A can be composed of G1 bits. In this case, when Information B is 0 bits, the total number of UE groups distinguishable by PS-DCI can be G1. When Information B is G2 bits, the total number of UE groups distinguishable by PS-DCI can be G1 + G2 bits.

[0257] Using the approach proposed in Proposal 1-2-Ab, the short message field configured in PS-DCI can be used to send short messages and UE group indication information together, and information about the UE group can be provided as needed, even when a separate UE group indication field is not configured using bits other than the short message field. Furthermore, to provide additional information that can be introduced for energy-saving purposes, the BS can use the Info_Others area and adjust the size of each field as needed.

[0258] [Table 6]

[0259]

[0260] (Proposal 1-2-Ac) As a specific example of Proposal 1-2-A, when the PS-DCI contains a Short Message Indicator field and an additional bit field other than the Short Message Indicator (hereinafter, Other_bit_field), and the included Short Message Indicator...

[0261] When the message indicator indicates that there will be no PDSCH scheduling for a UE monitoring PS-DCI, the UE may assume that the Other_bit_field is a reserved bit. In this case, the indication that there will be no PDSCH scheduling can correspond to the "10" state of the short message indicator in Proposal 1-2-Aa and the "00" or "10" state of the short message indicator in Proposal 1-2-Ab.

[0262] Proposal 1-2-A-c1 may be applied only when there is no separate operation defined for a UE for which the PS-DCI has no information related to PDSCH scheduling as determined by the short message indicator, or when there is a separate operation defined for a UE, but the UE does not receive an indication from the BS to enable the operation (or receives an indication to disable the operation).

[0263] In contrast, operational rules can be supported when the UE determines via a short message indicator that the PS-DCI lacks information related to PDSCH scheduling. In this case, when the short message indicator in the PS-DCI indicates that there is no PDSCH scheduling for the UE monitoring the PS-DCI, the UE can use the Other_bit_field for purposes other than the UE group indication. In this case, the predetermined rules can only be applied if the UE receives an indication to enable the above operation (or does not receive an indication to disable the operation).

[0264] Proposal 1-2-A-c1 allows the UE to assume that bit fields undefined by the supported standard are in a reserved state, thereby enabling the BS to simultaneously support UEs that can use bit fields.

[0265] When the PS-DCI is used to indicate whether a paging is sent, the decoding reliability of the PS-DCI can affect the success of the UE receiving the paging. As a method to increase the decoding reliability of the PS-DCI, it is necessary to consider minimizing the bit size of the PS-DCI. In the examples of this disclosure, as proposed in Proposal 1-2-B, the operations to be performed when the size of the Short Message Indicator field included in the PS-DCI is configured to be 1 bit are proposed.

[0266] (Proposal 1-2-B)

[0267] As a concrete example of Proposal 1-2, a 1-bit Short Message Indicator field can be configured in the PS-DCI. In this case, this 1 bit can be used to indicate whether the PS-DCI contains short message information. For example, when this 1 bit is in the "0" state, it can indicate that the PS-DCI does not contain short message information. When the PS-DCI is in the "1" state, it can indicate that the PS-DCI includes short message information. Table 7 shows an example of the operation proposed in Proposal 1-2-B.

[0268] When Proposal 1-2-B is applied and a 1-bit Short Message Indicator indicates the presence of a short message in the PS-DCI, the UE can obtain the short message information through the short message field configured in the PS-DCI. In this case, the method proposed in Proposal 1-1 can be used as a method for configuring the short message field and for the UE to obtain information through it.

[0269] When the application proposes 1-2-B and a 1-bit short message indicator indicates that a short message is missing from the PS-DCI, the UE may assume that a short message field does not exist in the PS-DCI or that the existing short message field will not be used for short message transmission. In this case, the UE may consider that the bits included in the existing short message field are reserved or assume that these bits will be used for purposes other than short message transmission. As an example of using an existing short message field for another purpose, the short message field can be used for UE group indication. As another example, the short message field can be used to provide information related to the transmission of reference signals (e.g., CSI-RS / TRS, DMRS, etc.) that can be transmitted for purposes such as T / F tracking or measurement. In this way, it can be determined by the short message indicator that a short message does not exist in the existing short message field. In this case, the short message field can only be used for another purpose if the UE has the relevant capability or the UE receives a signal from the BS indicating that the UE supports the relevant operation (e.g., higher-layer signaling).

[0270] When Proposal 1-2-B is applied and the PS-DCI contains a bit field indicating UE group indication, the UE can monitor the PO corresponding to the PS-DCI to receive the PDSCH only if the information in the UE group indication bit field indicates that a schedule corresponding to the UE's UE_G_ID will exist. When the UE does not receive a schedule indication corresponding to its UE_G_ID or receives an indication that no schedule exists, the UE may not anticipate a PDSCH schedule for that PO associated with the PS-DCI.

[0271] According to Proposal 1-2-B, the 2-bit short message indicator of the paging DCI indicating the presence of PDSCH scheduling information is replaced by the UE group indicator bit field. Therefore, the DCI bit overhead can be reduced. Furthermore, since the remaining 1 bit is used to allow the short message field to be used for other purposes when no short message is present in the PS-DCI, resource utilization benefits can be increased.

[0272] [Table 7]

[0273] Bit field SMS indicator 0 Short messages do not exist in DCI. 1 Short messages exist in DCI.

[0274] (Proposal 2) Add P-DCI functionality to paging DCI

[0275] In the examples of this disclosure, a method is proposed, as in Proposal 2, to support energy-efficient operation of UEs with energy-saving capabilities by redesigning some bits of the paging DCI. When the BS has a large number of DL traffic to transmit or the PO operation is high-density, transmitting additional signals / channels for energy saving may not be suitable, as this method may increase network overhead. Currently, based on NR Rel-16, the paging DCI has reserved bits that the UE always assumes and can conditionally assume. NR UEs supporting standards up to Rel-16 assume that the reserved state can be represented in any bit during the decoding of the paging DCI and do not expect to obtain information through the reserved bits. In the examples of this disclosure, an operation is proposed to support energy-efficient operation of the UE by utilizing the reserved bits present in the paging DCI. The methods proposed in Proposal 2 do not incur separate network overhead because they support energy-efficient operation through the paging DCI used for legacy UEs.

[0276] (Proposal 2-1) Energy saving based on the status of the short message indicator in the paging DCI

[0277] In the examples of this disclosure, proposal 2-1 proposes including power-saving information in the paging DCI, and the interpretation of the UE's paging DCI, including the UE grouping method, is determined based on the state of the short message indicator sent along with the DCI. Based on the current Rel-16 NR, the short message indicator included in the paging DCI is configured as two bits and used to transmit a reserved state and three important messages (i.e., short message only, PDSCH scheduling information only, and both short message and PDSCH scheduling information). In this case, some bit fields in the paging DCI can be considered reserved bits according to the various states indicated by the short message indicator. In this case, the position and number of reserved bits can vary according to the various states of the short message indicator. Therefore, appropriate or expressible power-saving operations can vary according to the various states of the short message indicator. In the examples of this disclosure, considering these conditions, a power-saving operation method based on the state of the short message indicator, as proposed in proposal 2-1, is proposed. In specific examples based on the state of the Short Message Indicator (SMI) field, the following proposals 2-1-A, 2-1-B, 2-1-C, and 2-1-D can be used. Each method can be used independently, or one or more methods can be combined. When there is a state of the SMI field that is not covered by the combination of the proposed methods, the state of the SMI field can conform to the operation of the general UE (i.e., a UE that does not support energy saving using paging DCI). For example, when energy-saving operations are defined only for SMI states "01", "10", and "11", without a separate definition for state "00", the operation under state "00" can conform to the operation of a general UE (i.e., an NR UE that supports the same version but does not support energy saving using paging DCI).

[0278] (Proposal 2-1-A)

[0279] As a specific example of Proposal 2-1, when the short message indicator of the paging DCI is in state "00", the UE can expect that there is no short message field in the paging DCI, or that the short message field is not used to transmit short messages. In this case, instead of short messages, the UE can expect other information to be used for energy saving.

[0280] As a specific example of Proposal 2-1-A, when the Short Message Indicator (SMI) of the Paging DCI is in state "00", the SMI field of the Paging DCI can be used for UE group indication information. When the SMI is in state "00", the UE can expect that PDSCH scheduling information for any UE group can be included in the PMI. When the UE group indication information indicates that the UE should receive PDSCH, the UE can obtain the PDSCH scheduling information through the PMI and then perform the operation to receive the PDSCH. When the UE recognizes that there is no PDSCH transmission for its UE_G_ID in the UE group indication information, the UE can assume that the UE does not need to attempt to receive the PDSCH. In this case, unnecessary power consumption can be reduced by skipping the operation of receiving the PDSCH.

[0281] As a specific example of Proposal 2-1-A, when the short message indicator of the paging DCI is in state "00", the fields of the PDSCH scheduling information defined in conventional paging DCI (e.g., the paging DCI used by energy-efficient NR UEs that do not support paging DCI) can be applied in the same manner to the regions of the PDSCH scheduling information in the paging DCI. The regions of the PDSCH scheduling information may include frequency domain resource assignment fields, time domain resource assignment fields, VRB to PRB mapping fields, modulation and coding scheme fields, and TB scaling fields, which can be applied when the DCI format is scrambled with P-RNTI in 0_1.

[0282] By employing the method proposed in Proposal 2-1-A, it is possible to prevent legacy UEs from attempting to obtain PDSCH information via paging DCI during PDSCH scheduling for some UEs capable of using paging DCI for UE grouping. Therefore, energy-saving effects can be achieved for both legacy UEs and energy-efficient UEs.

[0283] (Proposal 2-1-B)

[0284] As a specific example of Proposal 2-1, when the short message indicator of the paging DCI is in state "01", the UE can expect that the short message field of the paging DCI will not be used to transmit short messages. In this case, the UE can expect other information to replace the short message for energy saving.

[0285] As a specific example of Proposal 2-1-B, when the short message indicator of the paging DCI is in state "01", the short message field of the paging DCI can be used for UE group indication information. The UE can expect that PDSCH scheduling information for any UE group can be included in the paging DCI. When the UE group indication information indicates that the UE should receive PDSCH, the UE can obtain the PDSCH scheduling information through the paging DCI and then perform the operation to receive the PDSCH. When the UE recognizes that there is no PDSCH transmission for its UE_G_ID in the UE group indication information, the UE can assume that the UE does not need to attempt to receive the PDSCH. In this case, unnecessary power consumption can be reduced by skipping the operation of receiving the PDSCH.

[0286] As a specific example of Proposal 2-1-B, when the short message indicator of the paging DCI is in state "01", the fields of the PDSCH scheduling information defined in conventional paging DCI (e.g., the paging DCI used by energy-efficient NR UEs that do not support paging DCI) can be applied in the same manner to the regions of the PDSCH scheduling information in the paging DCI. The regions of the PDSCH scheduling information may include frequency domain resource assignment fields, time domain resource assignment fields, VRB to PRB mapping fields, modulation and coding scheme fields, and TB scaling fields, which can be applied when DCI format 0_1 ​​is scrambled with P-RNTI.

[0287] Using the method proposed in Proposal 2-1-B, PDSCH can be scheduled simultaneously for UEs capable of UE packetization and legacy UEs sharing the same PO. When the short message indicator is in the state of "01", legacy UEs assume that the short message field is a reserved bit and are therefore unaffected by the provision of packet-related information by UEs using that state.

[0288] (Proposal 2-1-C)

[0289] As a specific example of Proposal 2-1, when the short message indicator of the paging DCI is in state "10", the short message can be carried in the short message field of the paging DCI, and the UE can expect the UE's PDSCH scheduling information in the paging DCI.

[0290] (Proposal 2-1-Ca) As a specific example of Proposal 2-1-C, when the short message indicator of the paging DCI is in state "10", the short message field in the paging DCI can be used together with the short message information for UE group indication information. Based on the NR Rel-16 standard, up to three short message messages are defined to be included in the paging DCI, and the undefined five bits are assumed to be reserved bits by the UE. Proposal 2-1-Ca proposes a method for using reserved bits for UE group indication.

[0291] In a specific implementation of Proposal 2-1-Ca, when the actual number of short messages used is L, the M bits in the short message field can be used for UE group indication. M can be configured by the BS. Here, M should satisfy the condition M≤8-L, and the remaining 8-LM bits can be assumed to be reserved bits. As a more specific example, considering the index of the bits constituting the short message field, the short message field can be configured such that the L-bit short message, NLM-bit reserved bits, and M-bit UG field are arranged in this order.

[0292] In a specific implementation of Proposal 2-1-Ca, a UE that anticipates PDSCH scheduling based on UE group indication information can receive PDSCH by applying PDSCH scheduling information contained in the paging DCI.

[0293] According to Proposal 2-1-Ca, by utilizing reserved bits in the short message field, PDSCH scheduling information with the same level of flexibility as traditional UEs can be sent and received.

[0294] (Proposal 2-1-Cb) As a specific example of Proposal 2-1-C, when the short message indicator of the paging DCI is in state "10", the short message field of the paging DCI can be used only for short message information, and the remaining bits can be used to provide UE group indication and PDSCH scheduling information. When the short message indicator is in state "10", energy-efficient UEs that do not expect to use paging DCI can expect only the transmission of short messages through DCI, without expecting PDSCH scheduling information. Based on these characteristics, Proposal 2-1-Cb proposes a redesigned information method so that when a traditional UE does not expect information, the scheduling information field simultaneously provides UE group indication and PDSCH scheduling information.

[0295] According to Proposal 2-1-Cb, the short message field is maintained. Therefore, when some bits of the short message field are added in the future, they can be easily supported. Thus, benefits in terms of backward compatibility are readily available.

[0296] When both a UE capable of UE grouping and a legacy UE sharing the same PO require notification of Short Message Service (SMS) information, the method proposed in Proposal 2-1-C can be used. Furthermore, it prevents legacy UEs from attempting to obtain PDSCH information via Paging DCI during PDSCH scheduling for some UEs capable of UE grouping using Paging DCI. Therefore, energy-saving effects can be achieved for both legacy UEs and energy-efficient UEs.

[0297] (Proposal 2-1-D)

[0298] As a specific example of Proposal 2-1, when the short message indicator of the paging DCI is in state "11", the short message can be carried in the short message field of the paging DCI, and the UE can expect the UE's PDSCH scheduling information in the paging DCI.

[0299] As a specific example of Proposal 2-1-D, when the short message indicator of the paging DCI is in state "11", the short message field in the paging DCI can be used together with the short message information for UE group indication information. Based on the NR Rel-16 standard, up to three short message messages are defined to be included in the paging DCI, and the undefined five bits are assumed to be reserved bits by the UE. Proposal 2-1-Ca proposes a method for using reserved bits for UE group indication.

[0300] In a specific implementation of Proposal 2-1-D, when the actual number of short messages used is L, the M bits in the short message field can be used for UE group indication. M can be configured by the BS. Here, M should satisfy the condition M≤8-L, and the remaining 8-LM bits can be assumed to be reserved bits. As a more specific example, considering the index of the bits constituting the short message field, the short message field can be configured such that the L-bit short message, NLM-bit reserved bits, and M-bit UG field are arranged in this order.

[0301] In a specific implementation of Proposal 2-1-D, a UE that anticipates PDSCH scheduling based on UE group indication information can receive PDSCH by applying PDSCH scheduling information contained in the paging DCI.

[0302] According to Proposal 2-1-D, by utilizing reserved bits in the Short Message field, PDSCH scheduling information can be sent and received with the same level of flexibility as conventional UEs. Furthermore, PDSCH scheduling information can be provided along with Short Messages to both UEs capable of UE packetization and conventional UEs.

[0303] (Proposal 2-2) Add an energy-saving indicator to the short message field of the paging DCI.

[0304] In the examples disclosed herein, as proposed in Proposal 2-2, an indicator bit for power-saving operation is added to the short message indicator included in the paging DCI, and power-saving related operations are determined by the power-saving indicator bit. Based on NR Rel-16, the short message field of the paging DCI consists of 8 bits, and the operation of 3 of these bits is defined. When the UE identifies short message information through the short message indicator field, the UE can anticipate the relevant information defined in the 3-bit area and assume that the remaining 5 bits are reserved bits. Conversely, when the UE identifies short message information not included through the short message indicator field, the UE can assume that all 8 bits are reserved bits for operation. Reserved bits are available when the BS needs to provide information not included in the paging message to multiple unspecified targets. Therefore, benefits can be expected in terms of backward compatibility. However, using all (or more) reserved bits in the short message for UE grouping may be disadvantageous for the scalability of future generated short message information. To address this issue, and while using the Short Message Service (SMS) field to provide UE grouping information, Proposal 2-2 proposes adding a power-saving indicator bit to the SMS field and using the status of the power-saving indicator bit to indicate whether the paging DCI contains power-saving related information. As a specific example of power-saving related information, it could include a UE group indicator to provide information about the UE's UE_G_ID. Although UE grouping indication is primarily described in Proposal 2-2 for simplicity, the principles of this disclosure can be applied to power-saving operations in other methods.

[0305] As a specific example of Proposal 2-2, the Dth bit of the short message field (i.e., the bit with index #D) can be defined for a power-saving indicator. In this case, the information indicated by the power-saving indicator may be about whether the UG field is configured in the short message field. When the power-saving indicator indicates that UE group indication information of size M bits is provided in the short message field, the UE may assume that bits D+1 to D+M in the short message field are configured as the UG field. On the other hand, when the power-saving indicator indicates that UE group indication information is not included in the short message field, the UE may assume that bits D+1 to 8 in the short message field are determined by a predetermined rule. Here, the predetermined rule may be that if another short message is defined between bits D+1 and 8, the defined message should be followed, and bits of short messages that are not separately defined are assumed to be reserved bits.

[0306] In the proposed method, the value of D can be predetermined by the standard. For example, it can be set to 4. This is intended to ensure the use of three short messages based on NR Rel-16. Specifically, for systems that do not apply the third bit for stopPagingMonitoring, D can be exceptionally set to 3. This is intended to add additional available short message resources for systems that do not require this information, since the introduction of the third bit for stopPagingMonitoring is primarily to support NR-U service scenarios.

[0307] As another example of determining the value of D in the proposed method, D can be configured to have a value of 1. This can be intended to increase the number of UE groups by using the entire short message field for the UE group indication when the short message indicator indicates a state of no short message delivery (i.e., state "00" or "01").

[0308] The method proposed in Proposal 2-2 supports UE packet indication using the Short Message field while satisfying backward compatibility. This method also benefits forward compatibility because it allows the bits of the Short Message field to be used for other purposes in the future.

[0309] (Proposal 2-3) Energy-saving method using reserved bits not included in the short message field of paging DCI.

[0310] Examples of this disclosure, such as those in Proposal 2-3, propose using reserved bits (i.e., independent bit regions not present in the Short Message field) existing in the Paging DCI to support power-saving operations. Based on the NR Rel-16 standard, the Paging DCI has a total of 6 reserved bits (hereinafter, added reserved bits), which are independent of the Short Message field configuration. The added reserved bits are always present, unaffected by the Short Message Indicator, and do not affect the Short Message information. Therefore, they can be guaranteed to be of a specific size, independent of the state of the Short Message Indicator. Furthermore, even if additional information is introduced into the Short Message field in the future, the amount of available information can be supported at the same level. Proposal 2-3 proposes using added reserved bits to provide power-saving information. For example, UE group indicators can be used for power-saving information. Although UE group indicators are primarily described in Proposal 2-3 for simplicity, the principles of this disclosure can be applied to power-saving operations in other methods.

[0311] In Proposals 2-3, the number of bits used for adding reserved bits for UE group indication can be predetermined by the standard. This does not incur additional signaling overhead. For example, when using six bits, the Add Reserved Bits field can be used to distinguish up to six UE groups. Alternatively, the bit size can be configured by the BS. When no configured value exists, a default value can be applied (e.g., 0 bits or no configured UG field). This is intended to support the introduction of additional features in the paging DCI in the future. Conversely, all bits can be used for UE group indication.

[0312] (Proposal 2-3-A)

[0313] As a specific example of Proposal 2-3, considering the case where the R bit in the Add Reserved Bits field can be configured as the UG field (hereinafter, UG field 1) and the S bit in the Short Message field can be configured as the UG field (hereinafter, UG field 2), Proposal 2-3-A proposes a method for performing UE group indication using two regions. This method aims to increase the number of UE groups that can be expressed compared to the case where only the Add Reserved Bits region is used to present UE group information. Specifically, UG field 2 can be configured by a combination of one or more methods proposed in Proposal 2-1 and Proposal 2-2.

[0314] In Proposal 2-3-A, whether or not a region of UG field 2 is used can be determined based on conditions. Furthermore, even when a region of UG field 2 is used, the size of UG field 2 can vary depending on conditions. This is intended to consider the available size of UG field 2 based on conditions (e.g., the information indicated in the SMS indicator field and / or the size of configurable fields in the SMS field), as described in Proposals 2-1 and 2-2. For example, when the 2 bits of the SMS indicator are “01” and Proposal 2-3-A is applied, the size of UG field 2 can be set to S = 8 bits. Alternatively, when the 2 bits of the SMS indicator are “10” or “11” and Proposal 2-3-A is applied, the size of UG field 2 can be set to S = 4 bits. The above examples of values ​​for S are examples of the operation of the proposed method, and the principles of this disclosure can be applied even when using a different size for S.

[0315] As a concrete example of Proposal 2-3-A, the R bits and S bits can be configured into a single UG field (hereinafter, UG field 3). For example, when the presence of a PDSCH schedule corresponding to a UE_G_ID can be expressed in 1 bit, a total of R+S UE groups can be distinguished by UG field 3. This could be intended to increase the energy-saving benefits of UE grouping by increasing the total number of UE groups that can be expressed.

[0316] Alternatively, as another specific example of Proposal 2-3-A, the characteristics of the UE group or UE_G_ID indicated by UG Field 1 and UG Field 2 can be configured to be different from each other. For example, UG Field 1 can be configured to perform UE group indication using a UE_G_ID based on the UE_G_ID (e.g., the method proposed in Proposal 0-2-A above), and UG Field 2 can be configured to perform UE group indication based on a UE_G_ID configured separately by the BS (e.g., the method proposed in Proposal 0-2-B). This could be intended to design two types of UE group indication methods that can be supported simultaneously using a single paging DCI. Furthermore, when the available size of UG Field 2 varies depending on the circumstances, UG Field 1 can be used essentially to support UE grouping based on the UE_ID. The BS can enable and use UG Field 2 as appropriate when the use of a UE_G_ID configured for a specific purpose is beneficial.

[0317] The preceding text presented methods for transmitting PEI (i.e., P-DCI and PS-DCI). Specifically, it discussed methods for providing information about UE groups / subgroups via PEI, methods for including short messages (or related information) in PEI, and energy-saving methods for using paging DCI when PEI is not configured. These methods can increase power efficiency by reducing unnecessary monitoring of PO by idle / inactive mode UEs. Furthermore, in the proposed methods, UEs monitoring PEI can obtain some information (e.g., short messages) that can be received via paging DCI simply by receiving PEI. Therefore, the energy-saving benefits can be further improved by preventing UEs from additionally detecting paging DCI to obtain this information.

[0318] The paging mentioned in the description of PEI is an example to which this disclosure applies. As described in the introduction, the proposals in this specification can generally be applied to signal / channel transmission / reception schemes to provide advance notice of whether a particular signal / channel will be transmitted or to provide specific information in advance for energy saving or complexity / overhead reduction purposes. For example, a signal (e.g., a channel / signal such as PEI / P-DCI / PS-DCI) may be transmitted for TRS / CSI-RS availability indication. Signal B may be a reference signal that the UE can expect (e.g., DMRS, CSI-RS / TRS).

[0319] Figure 16 The flowchart of a signal transmission / reception method according to an embodiment of the present disclosure is shown. Figure 16 These are application / implementation examples of at least a portion of the above proposal. Redundant descriptions will be omitted, and reference to the above descriptions may be made as needed.

[0320] Reference Figure 16The BS can send a SIGNAL-A (F05) to indicate in advance whether paging control information (DCI) will be provided on the paging opportunity (PO) configured for paging operations in idle or inactive modes. The UE can receive the SIGNAL-A to indicate in advance whether paging DCI will be provided on the PO configured for paging operations in idle or inactive modes. SIGNAL-A can be a Physical Link Control Channel (PDCCH) signal carrying a specific DCI (e.g., PEI, P(S)-DCI) configured for idle or inactive modes.

[0321] The UE can determine whether to skip the paging DCI detection process based on SIGNAL-A (F10). Since a specific DCI is associated with multiple POs, the UE can decide to skip the paging DCI detection process unless at least one PO providing the paging DCI is configured for the UE.

[0322] The BS can send paging DCIs (F11) based on SIGNAL-A. The BS can associate a specific DCI with multiple POs and send a specific DCI at once to notify whether a paging DCI is provided for each of the multiple POs.

[0323] The specific DCI for which advance indication of whether paging DCI is provided may contain at least one short message field related to system information changes or Earthquake and Tsunami Warning System / Commercial Mobile Alarm System (ETWS / CMAS) indications. Even if the UE determines to skip the paging DCI detection process, it can still obtain the value of the short message field included in the specific DCI (F25).

[0324] Short message fields included in a particular DCI may be at least partially the same as short message fields included in a paging DCI.

[0325] When a specific DCI is associated with N POs = {PO#1, PO#2, ..., PO#N}, and each PO is associated with a specific UE group, the UE can determine the ID of the specific UE group to which the UE belongs based on the number N of POs associated with the specific DCI and the PO information configured for the UE.

[0326] The UE can identify the bit position of a specific PO associated with a specific UE group in a specific DCI based on the ID of the specific UE group.

[0327] The UE can further consider the UE's UE identifier to determine the ID of a specific UE group.

[0328] The UE can determine whether to skip the paging DCI detection process based on whether a paging DCI should be provided on a specific PO related to a specific UE group among N POs associated with a specific DCI.

[0329] The UE (in RRC connection mode) can receive one or more higher-layer signaling (F01) messages from the BS. For example, the UE can obtain information from the BS about the number of POs N related to a specific DCI. For example, the UE can obtain information from the BS about the field configuration of a specific DCI or the size of at least one field included in a specific DCI.

[0330] The various descriptions, functions, processes, proposals, methods and / or operation flowcharts disclosed herein can be applied to (but are not limited to) various fields where wireless communication / connectivity (e.g., 5G) is required between devices.

[0331] Specific examples will be described in detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise indicated, the same reference numerals may denote the same or corresponding hardware blocks, software blocks, or functional blocks.

[0332] Figure 17 A communication system 1 applied to this disclosure is shown.

[0333] Reference Figure 17 The communication system 1 applied to this disclosure includes wireless devices, base stations (BS), and networks. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and may be referred to as a communication / radio / 5G device. Wireless devices may include (but are not limited to) robots 100a, vehicles 100b-1 and 100b-2, extended reality (XR) devices 100c, handheld devices 100d, home appliances 100e, Internet of Things (IoT) devices 100f, and artificial intelligence (AI) devices / servers 400. For example, vehicles may include vehicles with wireless communication capabilities, autonomous vehicles, and vehicles capable of performing communication between vehicles. Herein, vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may take the form of head-mounted displays (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices may include smartphones, smart tablets, wearable devices (e.g., smartwatches or smart glasses) and computers (e.g., laptops). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0334] Wireless devices 100a to 100f can connect to network 300 via BS200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., sidelink communication) without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0335] Wireless communication / connections 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS200 or between BS200 / BS200. In this document, wireless communication / connections can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). Wireless devices and BS / wireless devices can transmit / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can transmit / receive signals via various physical channels. For this purpose, at least a portion of the configuration information for configuring the process of transmitting / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes can be performed based on various proposals of this disclosure.

[0336] Figure 18 A wireless device applicable to this disclosure is shown.

[0337] Reference Figure 18 The first wireless device 100 and the second wireless device 200 can transmit radio signals via various RATs (e.g., LTE and NR). In this document, {first wireless device 100 and second wireless device 200} can correspond to... Figure 17 {Wireless Device 100x and BS200} and / or {Wireless Device 100x and Wireless Device 100x}.

[0338] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and / or one or more antennas 108. The processors 102 may control the memories 104 and / or the transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal via the transceivers 106. The processor 102 may receive a radio signal including a second information / signal via the transceivers 106, and then store the information obtained by processing the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information relating to the operation of the processor 102. For example, the memory 104 may store software code including commands for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed herein. In this document, processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). Transceiver 106 may be connected to processor 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. Transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In embodiments of this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0339] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and / or one or more antennas 208. The processors 202 may control the memories 204 and / or the transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processors 202 may process information in the memories 204 to generate a third information / signal, and then transmit a radio signal including the third information / signal via the transceivers 206. The processors 202 may receive a radio signal including a fourth information / signal via the transceivers 206, and then store the information obtained by processing the fourth information / signal in the memories 204. The memories 204 may be connected to the processors 202 and may store various information relating to the operation of the processors 202. For example, the memories 204 may store software code including commands for executing some or all of the processes controlled by the processors 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. In this document, processor 202 and memory 204 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). Transceiver 206 may be connected to processor 202 and transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. Transceiver 206 may be used interchangeably with an RF unit. In embodiments of this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0340] The hardware elements of wireless devices 100 and 200 will be described in more detail below. One or more protocol layers may be implemented by (but are not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information, according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) and acquire PDUs, SDUs, messages, control information, data, or information from one or more transceivers 106 and 206, according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document.

[0341] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document can be implemented using firmware or software in the form of code, commands, and / or command sets.

[0342] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories 104 and 204 may be configured with read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0343] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operation flowcharts of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, one or more processors 102 and 202 may perform controls to enable one or more transceivers 106 and 206 to transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform controls to enable one or more transceivers 106 and 206 to receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document via one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing by one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc., processed by one or more processors 102 and 202 from baseband signals to RF band signals. For this purpose, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0344] Figure 19 Another example of a wireless device applied to this disclosure is shown. The wireless device may vary depending on usage / service (see reference). Figure 17 It can be realized in various forms.

[0345] Reference Figure 19 Wireless devices 100 and 200 can correspond to Figure 18The wireless devices 100 and 200 are configured with various elements, components, units / parts, and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include... Figure 18 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, transceiver 114 may include Figure 18 The device comprises one or more transceivers 106 and 206 and / or one or more antennas 108 and 208. Control unit 120 is electrically connected to communication unit 110, memory unit 130, and add-on components 140, and controls the overall operation of the wireless device. For example, control unit 120 may control the electrical / mechanical operation of the wireless device based on programs / code / commands / information stored in memory unit 130. Control unit 120 may transmit information stored in memory unit 130 to an external source (e.g., other communication devices) via communication unit 110 through a wireless / wired interface, or store information received from an external source (e.g., other communication devices) via communication unit 110 in memory unit 130 via a wireless / wired interface.

[0346] The additional component 140 can be configured differently depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured according to (but is not limited to) a robot. Figure 17 100a), vehicles ( Figure 17 100b-1 and 100b-2), XR device ( Figure 17 100c), handheld device ( Figure 17 100d), home appliances ( Figure 17 100e), IoT devices ( Figure 17 100f), digital broadcasting terminals, holographic devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, AI servers / devices ( Figure 17 400), BS ( Figure 17 This can be achieved through 200 network nodes, etc. Wireless devices can be used in mobile or fixed locations depending on the use case / service.

[0347] exist Figure 19In wireless devices 100 and 200, all elements, components, units / parts, and / or modules may be interconnected via wired interfaces, or at least a portion thereof may be wirelessly connected via communication unit 110. For example, in each of wireless devices 100 and 200, control unit 120 and communication unit 110 may be wired connected, and control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected via communication unit 110. The various elements, components, units / parts, and / or modules within wireless devices 100 and 200 may also include one or more elements. For example, control unit 120 may be configured as a collection of one or more processors. As an example, control unit 120 may be configured as a collection of communication control processors, application processors, electronic control units (ECUs), graphics processing units, and memory control processors. As another example, memory unit 130 may be configured as random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), flash memory, volatile memory, non-volatile memory, and / or combinations thereof.

[0348] Figure 20 The illustration shows a vehicle or autonomous vehicle applicable to this disclosure. The vehicle or autonomous vehicle may be a mobile robot, car, train, manned / unmanned aerial vehicle (AV), vessel, etc.

[0349] Reference Figure 20 The vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d respectively correspond to... Figure 19 Blocks 110 / 130 / 140.

[0350] Communication unit 110 can send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. Control unit 120 can perform various operations by controlling the components of the vehicle or autonomous vehicle 100. Control unit 120 may include an electronic control unit (ECU). Drive unit 140a enables the vehicle or autonomous vehicle 100 to move on a road. Drive unit 140a may include an engine, motor, powertrain, wheels, brakes, steering mechanism, etc. Power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuitry, battery, etc. Sensor unit 140c can acquire vehicle status, surrounding environment information, user information, etc. Sensor unit 140c may include inertial measurement unit (IMU) sensors, collision sensors, wheel sensors, speed sensors, slope sensors, weight sensors, heading sensors, position modules, vehicle forward / reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, depth sensors, ultrasonic sensors, lighting sensors, pedal position sensors, etc. Autonomous driving unit 140d can implement technologies for maintaining the vehicle within its lane, technologies for automatically adjusting speed (e.g., adaptive cruise control), technologies for autonomously driving along a determined path, and technologies for automatically setting a route if a destination is set, etc.

[0351] For example, communication unit 110 can receive map data, traffic information data, etc., from an external server. Autonomous driving unit 140d can generate an autonomous driving path and driving plan from the acquired data. Control unit 120 can control drive unit 140a, enabling the vehicle or autonomous vehicle 100 to move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, communication unit 110 can periodically or non-periodically acquire recent traffic information data from an external server and acquire surrounding traffic information data from neighboring vehicles. During autonomous driving, sensor unit 140c can acquire vehicle status and / or surrounding environment information. Autonomous driving unit 140d can update the autonomous driving path and driving plan based on newly acquired data / information. Communication unit 110 can transmit information about vehicle location, autonomous driving path, and / or driving plan to an external server. The external server can predict traffic information data using AI technology, etc., based on information collected from the vehicle or autonomous vehicle, and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0352] Figure 21 This is a diagram illustrating the DRX operation of a UE according to an embodiment of the present disclosure.

[0353] The UE can perform DRX operation within the procedures and / or methods described / presented above. A UE configured with DRX can reduce power consumption by discontinuously receiving DL signals. DRX can be performed in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states. The UE performs DRX in the RRC_IDLE and RRC_INACTIVE states to receive paging signals discontinuously. DRX in the RRC_CONNECTED state (RRC_CONNECTED DRX) will be described below.

[0354] Reference Figure 21 The DRX cycle includes an on-duration period and a DRX opportunity. The DRX cycle defines the time interval between periodic repetitions of the on-duration period. The on-duration period is the time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the on-duration period. When the UE successfully detects a PDCCH during the PDCCH monitoring period, the UE starts an inactivity timer and remains awake. Conversely, when the UE fails to detect any PDCCH during the PDCCH monitoring period, the UE transitions to a sleep state after the on-duration period. Therefore, when DRX is configured, PDCCH monitoring / reception can be performed discontinuously in the time domain within the processes and / or methods described / presented above. For example, when DRX is configured, the PDCCH reception opportunity (e.g., a time slot with a PDCCH SS) can be configured discontinuously according to the DRX configuration in embodiments of this disclosure. Conversely, when DRX is not configured, PDCCH monitoring / reception can be performed continuously in the time domain. For example, when DRX is not configured, the PDCCH reception opportunity (e.g., a time slot with a PDCCH SS) can be configured continuously in embodiments of this disclosure. Regardless of whether DRX is configured, PDCCH monitoring can be limited during the time period configured as a measurement interval.

[0355] Table 8 describes the DRX operation of the UE (in RRC_CONNECTED state). Referring to Table 8, DRX configuration information is received via higher-layer signaling (e.g., RRC signaling), and DRX is controlled to be on / off via DRX commands from the MAC layer. Once DRX is configured, the UE can perform PDCCH monitoring discontinuously while executing the procedures and / or methods described / presented above.

[0356] [Table 8]

[0357]

[0358] MAC-CellGroupConfig includes the configuration information required to configure MAC parameters for a cell group. MAC-CellGroupConfig may also include DRX configuration information. For example, when defining a DRX, MAC-CellGroupConfig may include the following information.

[0359] The value of -drx-OnDurationTimer defines the duration of the initial cycle of the DRX loop.

[0360] The value of -drx-InactivityTimer defines the duration of the time period after the UE is woken up following the detection of a PDCCH timing that indicates the initial UL or DL ​​data.

[0361] The value of -drx-HARQ-RTT-TimerDL defines the duration of the maximum time period from the initial DL transmission until a DL retransmission is received.

[0362] The value of -drx-HARQ-RTT-TimerDL defines the maximum duration of the time period from receiving the initial UL transmission permission until receiving the UL retransmission permission.

[0363] -drx-LongCycleStartOffset: Defines the duration and start time of the DRX loop.

[0364] -drx-ShortCycle (optional): Defines the duration of a short DRX cycle.

[0365] When any of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL are running, the UE performs PDCCH monitoring at each PDCCH timing and remains in the wake-up state.

[0366] The above embodiments correspond to combinations of the elements and features of this disclosure in a prescribed form. Furthermore, unless explicitly stated otherwise, each element or feature may be considered optional. Each element or feature may be implemented without combination with other elements or features. Moreover, embodiments of this disclosure can be implemented by partially combining elements and / or features together. The order of operations described for each embodiment of this disclosure may be modified. Some configurations or features of one embodiment may be included in another embodiment, or may replace corresponding configurations or features of another embodiment. Furthermore, embodiments may be configured by combining claims not explicitly referenced in the appended claims, or may be included as new claims after filing the application.

[0367] Those skilled in the art will understand that this disclosure may be practiced in other specific forms besides those set forth herein without departing from the spirit and essential characteristics of this disclosure. Therefore, the above embodiments should be construed in all respects as illustrative rather than restrictive. The scope of this disclosure should be determined by the appended claims and their legal equivalents, and not by the foregoing description, and all changes falling within the meaning and scope of the appended claims are intended to be covered therewith.

[0368] Industrial applicability

[0369] This disclosure applies to UE, BS or other devices in wireless mobile communication systems.

Claims

1. A method performed by a user equipment (UE), the method comprising the following steps: The configuration information for receiving the first downlink control information (DCI) is received via higher-layer signaling. Based on the configuration information, the first DCI is received through the first physical downlink control channel (PDCCH); Based on the first DCI, determine whether to monitor the second PDCCH used to receive the second DCI related to paging; and Based on the determination that the second PDCCH needs to be monitored, the second PDCCH is monitored. The configuration information includes first information regarding the number of multiple paging opportunity points (POs) associated with the first DCI, and second information regarding the number of UE groups associated with the same PO. The first DCI includes a first field with N bits, and each bit in the first field is associated with a single UE group. Wherein, the UE checks the bit value in the first field for the specific UE group to which the UE belongs, and Wherein, based on the bit value being set to a first value, the UE determines to monitor the second PDCCH.

2. The method of claim 1, wherein, A UE group is a UE subgroup unit that monitors the same PO.

3. The method according to claim 2, wherein, The quantity of the plurality of POs is M, and Each of the N UE groups belongs to one of the M POs, where M is an integer less than N.

4. The method of claim 1, wherein, The UE obtains an index for the specific UE group based on the first information regarding the number of the plurality of POs.

5. The method of claim 4, wherein, The index of a particular UE group indicates the position of the bit value for that particular UE group within the N bits.

6. The method of claim 1, wherein, The higher-level signaling for the configuration information includes a System Information Block (SIB).

7. The method of claim 1, wherein, The first DCI includes a second field, which is for Tracking Reference Signal (TRS) information.

8. The method of claim 1, wherein, The configuration information includes search space information for the first PDCCH.

9. The method of claim 1, wherein, The configuration information includes information about the field configuration of the first DCI or the size of at least one field included in the first DCI.

10. The method of claim 1, wherein, The second DCI is used to schedule the Physical Downlink Shared Channel (PDSCH).

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

12. An apparatus comprising: Memory configured to store instructions; as well as A processor configured to execute the instructions to perform the operation. The operations of the processor include: The configuration information for receiving the first downlink control information (DCI) is received via higher-layer signaling. Based on the configuration information, the first DCI is received through the first physical downlink control channel (PDCCH); Based on the first DCI, determine whether to monitor the second PDCCH used to receive the second DCI related to paging; and Based on the determination that the second PDCCH needs to be monitored, the second PDCCH is monitored. The configuration information includes first information regarding the number of multiple paging opportunity points (POs) associated with the first DCI, and second information regarding the number of device groups associated with the same PO. The first DCI includes a first field with N bits, and each bit in the first field is associated with a single device group. The processor checks the bit value in the first field for the specific device group to which the device belongs, and Wherein, based on the bit value being set to a first value, the processor determines to monitor the second PDCCH.

13. The apparatus of claim 12, further comprising: transceiver The device in question is a user equipment (UE) in a wireless communication system.

14. A method performed by a base station, the method comprising the following steps: Configuration information for sending the first downlink control information (DCI) is transmitted via higher-layer signaling; Based on the configuration information, the first DCI is transmitted through the first physical downlink control channel (PDCCH); as well as The second DCI is sent via the second PDCCH based on the first DCI. The configuration information includes first information regarding the number of multiple paging opportunity points (POs) associated with the first DCI, and second information regarding the number of UE groups associated with the same PO. The first DCI includes a first field with N bits, and each bit in the first field is associated with a single user equipment (UE) group. The base station sets a bit value for a specific UE group in the first field, and Wherein, based on the bit value being set to a first value, the base station transmits the second PDCCH in the PO associated with the specific UE group.

15. A base station, the base station comprising: transceiver; as well as A processor configured to control the transceiver: Configuration information for sending the first downlink control information (DCI) is transmitted via higher-layer signaling; Based on the configuration information, the first DCI is transmitted through the first physical downlink control channel (PDCCH); as well as The second DCI is sent via the second PDCCH based on the first DCI. The configuration information includes first information regarding the number of multiple paging opportunity points (POs) associated with the first DCI, and second information regarding the number of UE groups associated with the same PO. The first DCI includes a first field with N bits, and each bit in the first field is associated with a single user equipment (UE) group. The base station sets a bit value for a specific UE group in the first field, and Wherein, based on the bit value being set to a first value, the base station transmits the second PDCCH in the PO associated with the specific UE group.

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