Method and device for transmitting low-power wake-up signal in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. A method performed by a user equipment (UE) may comprise the steps of: receiving, from a base station, first information about a configuration of a paging early indication (PEI) and second information for indicating not to monitor the PEI when a designated condition is satisfied; receiving a low power (LP) wake-up signal (WUS) from the base station; when the designated condition is not satisfied, receiving, from the base station through a main radio (MR) of the UE, the PEI for a paging occasion (PO) on the basis of the first information; and when the designated condition is satisfied, receiving, from the base station through the MR, a paging message in the PO without the monitoring of the PEI on the basis of the second information.

Description

Method and apparatus for transmitting a low-power wake-up signal in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system, and more specifically, to a system using a next-generation low-power radio (hereinafter LR) that supports power saving technology.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for the reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

[0004] Currently, discussions are underway to improve and enhance the performance of the initial 5G mobile communication technology, taking into account the services that the 5G mobile communication technology was intended to support. Additionally, standardization of the physical layer is in progress for technologies such as V2X (Vehicle-to-Everything), which helps autonomous vehicles make driving decisions and enhance user convenience based on their own location and status information transmitted by the vehicle; NR-U (New Radio Unlicensed), which aims for system operation in unlicensed bands to comply with various regulatory requirements; NR terminal low power consumption technology (UE Power Saving); Non-Terrestrial Network (NTN), which is direct terminal-satellite communication for securing coverage in areas where communication with the terrestrial network is impossible; and positioning.

[0005] In addition, standardization is underway in the field of wireless interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes to expand network service areas by integrating wireless backhaul links and access links, Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) Handover, and 2-step Random Access (2-step RACH for NR) which simplifies random access procedures. Standardization is also underway in the field of system architecture / services for 5G baseline architectures (e.g., Service based Architecture, Service based Interface) to incorporate Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC), which provides services based on the location of the terminal.

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas to guarantee coverage in the terahertz band of 6G mobile communication technology; metamaterial-based lenses and antennas; high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM); and Reconfigurable Intelligent Surface (RIS) technology to improve terahertz band signal coverage; as well as full-duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and Artificial Intelligence (AI) from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] According to one embodiment of the present disclosure, an apparatus and method capable of effectively providing services in a mobile communication system are provided.

[0009] According to one embodiment of the present disclosure, a method performed by user equipment (UE) may include: receiving from a base station first information regarding the setting of a paging early indication (PEI) and second information instructing not to monitor the PEI when a specified condition is satisfied; receiving a low power (LP)-wake-up signal (WUS) from the base station; receiving the PEI for a paging occasion (PO) based on the first information via the main radio (MR) of the UE from the base station when the specified condition is not satisfied; and receiving a paging message within the PO without monitoring the PEI based on the second information via the MR from the base station when the specified condition is satisfied.

[0010] According to one embodiment of the present disclosure, an apparatus and a method capable of effectively providing services in a wireless communication system may be provided.

[0011] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0012] FIG. 1 shows a next-generation mobile communication system structure that supports network energy saving according to one embodiment of the present disclosure.

[0013] FIG. 2 is a drawing for explaining the concept of a low-power radio (hereinafter LR) of a base station or cell according to one embodiment of the present disclosure.

[0014] FIG. 3 illustrates an example of a WUS transmission procedure of a terminal according to one embodiment of the present disclosure.

[0015] FIG. 4 is a diagram illustrating an example of a Paging transmission procedure transmitted by a base station to a terminal according to an embodiment of the present disclosure.

[0016] FIG. 5 is a diagram illustrating an example in which a terminal according to one embodiment of the present disclosure attempts to receive LP WUS and PEI according to a promise.

[0017] FIG. 6 illustrates an example in which a terminal according to one embodiment of the present disclosure receives PEI-related settings and conditions from a base station in connection mode and operates according to the conditions.

[0018] FIG. 7 illustrates an example in which a terminal according to one embodiment of the present disclosure receives PEI-related settings and conditions from a base station in connection mode and operates according to the conditions.

[0019] FIG. 8 is a drawing illustrating the structure of a base station according to one embodiment of the present disclosure.

[0020] FIG. 9 is a drawing illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0021] The operating principles of the present disclosure are described in detail below with reference to the attached drawings. In describing the present disclosure below, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the present disclosure. Furthermore, the terms described below are defined in consideration of their functions in the present disclosure, and these may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0022] Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0023] For example, the base station, as the entity performing resource allocation for the terminal, may be at least one of a gNode B (next generation node B), an eNode B (E-UTRAN (Evolved Universal Terrestrial Radio Access Network) node B), a Node B, a BS (Base Station), a radio access unit, a base station controller, or a node on the network. For example, the terminal may include at least one of a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, the Downlink (DL) may be referred to as the wireless transmission path of a signal transmitted by the base station to the terminal, and the Uplink (UL) may be referred to as the wireless transmission path of a signal transmitted by the terminal to the base station. Furthermore, while an LTE (long term evolution) or LTE-A (advanced) system may be described as an example below, the embodiments of this disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which the embodiments of the present disclosure can be applied, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made in the judgment of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure. In this case, it will be understood that each block of the processing flowcharts and combinations of the flowcharts may be executed by computer program instructions.

[0024] Since these computer program instructions can be loaded onto the processor of a general-purpose computer, a computer for special purposes, or other programmable data processing equipment, instructions executed through the processor of the computer or other programmable data processing equipment create means for performing the functions described in the flowchart block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement functions in a specific way, instructions stored in computer-available or computer-readable memory can also produce manufactured items containing means of instruction for performing the functions described in the flowchart block(s). Since computer program instructions can also be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a computer-executable process can also provide steps for performing the functions described in the flowchart block(s).

[0025] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). Also, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown consecutively may actually be executed substantially simultaneously, or the blocks may be executed in reverse order depending on the corresponding function. In this case, the term 'unit' as used in this embodiment refers to a software or hardware component such as a Field Programmable Gate Array (FPGA) or Application Specific Integrated Circuit (ASIC), and the 'unit' may perform certain roles. However, the meaning of 'unit' is not limited to software or hardware. The 'unit' may be configured to reside in an addressable storage medium or configured to run one or more processors. Accordingly, as an example, 'part' includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and / or variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or further separated into additional components and 'parts'. Furthermore, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Additionally, in an embodiment, 'part' may include one or more processors.

[0026] For convenience of explanation, the terms and names defined in the 5GS (fifth generation system) and NR (new radio) specifications, which are standards defined by the 3GPP (The 3rd Generation Partnership Project), are used in this disclosure. However, this disclosure is not limited to the terms and names described above and may be applied equally to wireless communication networks conforming to other standards. For example, this disclosure may be applied to the 3GPP 5GS / NR (5th generation mobile communication standard).

[0027] Fifth-generation wireless communication systems operate in higher frequency bands (e.g., mmWave frequency bands), and terminals (UEs, user equipment) and base stations (gNBs, new radio node Bs, NR gNBs) can communicate with each other using beamforming. Beamforming technology is used to mitigate propagation path loss and increase the propagation distance for communication in higher frequency bands. Beamforming improves transmission and reception performance by using high-gain antennas. Beamforming can be classified into transmission (TX) beamforming, performed at the transmitting end, and reception (RX) beamforming, performed at the receiving end. Generally, TX beamforming can increase directivity by using multiple antennas to densely position the area where radio waves reach in a specific direction. In this context, a set of multiple antennas can be referred to as an antenna array, and each antenna included in the array can be referred to as an array element. Antenna arrays can be configured in various forms, such as linear arrays and planar arrays. The use of TX (transmission) beamforming results in increased signal directivity, thereby extending the propagation distance. Additionally, since the signal is rarely transmitted in directions other than the directed direction, signal interference acting on other receivers can be significantly reduced. The receiver can perform beamforming on the RX (reception) signal using an RX (reception) antenna array. RX beamforming increases the strength of the RX signal transmitted in a specific direction by concentrating radio waves in that direction, and can provide the effect of blocking interference signals by excluding signals transmitted in non-specific directions from the RX signal. Using beamforming technology, the transmitter can create multiple transmission beam patterns in different directions. Each of these transmission beam patterns can also be referred to as a transmission (TX) beam.Wireless communication systems operating at high frequencies transmit signals within a cell using multiple narrow TX beams, which may be because each narrow TX beam provides coverage to a portion of the cell. The narrower the TX beam, the higher the antenna gain, and thus the propagation distance of the signal transmitted using beamforming can be increased. A receiver can also generate multiple receive (RX) beam patterns in different directions. Each of these receive patterns can also be referred to as a receive (RX) beam.

[0028] Fifth-generation wireless communication systems support not only standalone mode operation but also dual connectivity (DC). In DC (e.g., EN(EUTRAN NR)-DC), multiple Rx / Tx UEs can be configured to utilize resources provided by two different nodes (or NBs) connected via a non-ideal backhaul. One node can act as the master node (MN) and the other as the secondary node (SN). The MN and SN are connected via network interfaces, and at least one MN can be connected to the core network. NR also supports Multi-RAT dual connectivity (MR-DC) operation, where UEs in the RRC_CONNECTED state (radio resource control connected state) are configured to utilize radio resources provided by two separate schedulers connected via a non-ideal backhaul and can provide E-UTRA (i.e., when the node is an ng-eNB) or NR access (i.e., when the node is a gNB). In NR, a UE in the RRC_CONNECTED state that is not configured with CA (carrier aggregation) / DC has only one serving cell consisting of a primary cell. For a UE in the RRC_CONNECTED state configured with CA / DC, the term 'serving cell' is used to refer to a set of cells that includes special cells and all subcells. In NR, a master cell group (MCG) can be referred to as a group of serving cells associated with a master node, and an MCG may include a PCell (primary cell) and optionally one or more SCell(s) (secondary cell(s)).In NR, a secondary cell group (SCG) refers to a group of serving cells associated with a secondary node, and an SCG may include a primary secondary cell (PSCell, primary SCG cell) and optionally one or more SCells. In NR, a primary cell (PCell) may be referred to as a serving cell within an MCG operating at the fundamental frequency where the UE performs the initial connection setup procedure or initiates the connection reset procedure. For a UE configured with CA, an Scell ​​in NR is a cell that provides additional radio resources on top of a special cell. A primary SCG cell (PSCell) may be referred to as a serving cell within an SCG where the UE performs random access when executing the Reconfiguration with Sync procedure. For dual connectivity operation, a special cell (SpCell) refers to a PCell in an MCG or a PSCell in an SCG; otherwise, the term special cell refers to a PCell.

[0029] Acquisition of system information in a 5th generation wireless communication system: In a 5th generation wireless communication system, a node B (e.g., gNB) or a base station broadcasts a synchronization signal (SS) and a physical broadcast channel (PBCH) block (SSB), and at least one SS / PBCH block may consist of primary and secondary synchronization signals (PSS (primary synchronization signal), SSS (secondary synchronization signal)) and system information (e.g., MIB). System information includes common parameters required for communication in a cell. In a 5th generation wireless communication system (also called next-generation radio or NR), system information (SI) may be divided into a master information block (MIB) and a number of system information blocks (SIBs).

[0030] - MIB is always transmitted on the BCH (broadcast channel) at a period of 80 ms, is repeated within 80 ms, and contains parameters necessary to obtain SIB1 from the cell.

[0031] - SIB1 is transmitted over the DL-SCH (downlink shared channel) at a period of 160ms, and the transmission repetition is variable. The default transmission repetition period of SIB1 is 20ms, but the actual transmission repetition period depends on the network implementation. The scheduling information of SIB1 may include information regarding the mapping between the SIB and SI messages, the periodicity of each SI message, and the SI window length. The scheduling information of SIB1 may include an indicator for each SI message and may indicate whether the corresponding SI message is broadcast. If at least one SI message is not broadcast, SIB1 may include a random access resource (PRACH (physical random access channel) preamble(s) and PRACH resource(s)) (or information about the random access resource) requesting the gNB to broadcast one or more SI messages.

[0032] - SIBs other than SIB1 may be included in system information (SI) messages transmitted over DL-SCH. Only SIBs with the same period may be mapped to the same SI message. Each SI message may be transmitted within a time-domain window that occurs periodically (e.g., referred to as an SI-window of equal length for all SI messages). Each SI message is associated with an SI-window, and SI-windows of different SI messages do not overlap. That is, only the corresponding SI message may be transmitted within a single SI-window. Any SIB other than SIB1 may be configured as cell-specific or region-specific using the markings within SIB1. A cell-specific SIB is applicable only within the cell providing the SIB, while a region-specific SIB is applicable within a region called an SI area, which consists of one or more cells and can be identified by the systemInformationAreaID.

[0033] - A UE may acquire SIB1 from a camp-on cell or a serving cell. The UE may check the BroadcastStatus bit in SIB1 for the SI message it needs to acquire. An SI request configuration for a supplementary uplink (SUL) can be signaled by the gNB using the information element (IE) si-RequestConfigSUL in SIB1. If the IE si-RequestConfigSUL does not exist in SIB1, the UE may consider (or identify) that the SI request configuration for the SUL has not been signaled (or is not configured) by the gNB. An SI request configuration for a normal uplink (NUL) can be signaled by the gNB using the information element si-RequestConfig in SIB1. If the IE si-RequestConfig does not exist in SIB1, the UE may consider (or identify) that the SI request configuration for the NUL has not been signaled (or is not configured) by the gNB. If the SI message it needs to acquire is not being broadcast (i.e., the BroadcastStatus bit is set to 0), the UE begins sending an SI request. The procedure for sending an SI request is as follows:

[0034] - When the gNB signals (or sets) the SI request configuration for the SUL, and the SUL selection criteria are met (i.e., the reference signal received power (RSRP) derived from the SSB measurement of the camped cell or serving cell is less than rsrp-ThresholdSSB-SUL, where rsrp-ThresholdSSB-SUL is signaled (or set) by the gNB (e.g., in a broadcast signaling scheme such as SIB1)), the UE may initiate the transmission of the SI request based on the SI request based on Msg1 (message 1) on the SUL. In other words, the UE may initiate a random access procedure using the PRACH preamble(s) and PRACH resource(s) within the SI request configuration of the SUL. The UE may transmit Msg1 (i.e., the random access preamble) and wait for acknowledgment of the SI request. The random access resources (PRACH preamble(s) and PRACH time(s)) indicated in the SI request configuration of the SUL are used for Msg1. Msg1 is transmitted in SUL. When an acknowledgment for the SI request is received, the UE monitors the SI window of the requested SI message during one or more SI period(s) of the SI message.

[0035] - Otherwise, the gNB signals (or sets) the SI request configuration for the NUL (normal uplink), and the NUL selection criteria may be met (i.e., SUL is supported in the camped cell or serving cell, and the RSRP derived from the SSB measurement of the camped cell or serving cell is greater than or equal to rsrp-ThresholdSSB-SUL; or SUL is not supported in the serving cell). In this case, the UE may initiate the transmission of the SI request based on the Msg1-based SI request on the NUL. In other words, the UE may initiate a random access procedure using the PRACH preamble(s) and PRACH resource(s) within the NUL's SI request configuration. The UE may transmit Msg1 (i.e., the random access preamble) and wait for acknowledgment of the SI request. The random access resources (PRACH preamble(s) and PRACH time(s)) indicated in the NUL's SI request configuration are used for Msg1. Msg1 is transmitted from the NUL. When acknowledgment for an SI request is received, the UE can monitor the SI window of the requested SI message during one or more SI period(s) of the SI message.

[0036] - Otherwise, the UE may initiate the transmission of an SI request based on the Msg3 (message 3)-based SI request. In other words, the UE may initiate the transmission of an RRCSystemInfoRequest message. The UE may transmit Msg1 (i.e., a random access preamble) and wait for a random access response. Common random access resources (PRACH preamble(s) and PRACH time(s)) may be used for Msg1. Upon receiving a UL grant in the random access response, the UE may transmit an RRCSystemInfoRequest message and wait for (or monitor) an acknowledgment for the SI request (e.g., an RRCSystemInfoRequest message). When an acknowledgment for the SI request (i.e., an RRCSystemInfoRequest message) is received from the base station, the UE monitors the SI window of the requested SI message during one or more SI period(s) of the corresponding SI message. If SUL is set, the UL (uplink) carrier selection for Msg1 transmission may be selected by the UE in a manner similar to the method selected by the UE for Msg1-based SI requests. SUL is the UL carrier selected when the RSRP derived from the SSB measurement of the camped cell or serving cell is less than rsrp-ThresholdSSB-SUL, where rsrp-ThresholdSSB-SUL can be signaled (set) by the gNB (e.g., in broadcast signaling schemes such as SIB1). NUL is the UL carrier selected when the RSRP derived from the SSB measurement of the camped cell or serving cell is greater than or equal to rsrp-ThresholdSSB-SUL, where rsrp-ThresholdSSB-SUL can be signaled (set) by the gNB (e.g., in broadcast signaling schemes such as SIB1).

[0037] Physical downlink control channel (PDCCH) in a 5th generation wireless communication system: In a 5th generation wireless communication system, a PDCCH can be used to schedule DL (downlink) transmissions on a physical downlink shared channel (PDSCH) and UL transmissions on a physical uplink shared channel (PUSCH). Downlink control information (DCI) on the PDCCH may include downlink assignments that include at least information on modulation and coding formats, information on resource allocation, and / or hybrid automatic repeat request (HARQ) information associated with the DL-SCH. In addition to scheduling, PDCCH may be used to enable and disable PUSCH transmissions configured with configured grants, enable and disable PDSCH semi-persistent transmissions, notify one or more UEs of slot types, notify one or more UEs of PRB(s) (physical resource block(s)) and OFDM(orthogonal frequency-division multiplexing) symbol(s) so that the UEs can assume that a transmission is not intended, transmit TPC(transmit power control) commands for PUCCH and PUSCH, transmit one or more TPC commands for SRS(sounding reference signal) transmission by one or more UEs, switch the active bandwidth of the UEs, and / or initiate random access procedures. The UE may monitor a set of PDCCH candidates for monitoring cases configured in one or more configured control resource sets, called CORESETs, based on the corresponding search space configuration.A CORESET can be configured as a set of PRBs with 1 to 3 OFDM symbol time durations. Resource units, namely resource element groups (REGs) and control channel elements (CCEs), can be defined within a CORESET where each CCE constitutes a set of REGs. Control channels are formed by sets of CCEs, and different code rates for control channels can be implemented by assembling different numbers of CCEs. Interleaved CCE-to-REG mapping and non-interleaved CCE-to-REG mapping are supported in the CORESET. Polar coding can be used for the PDCCH. Each resource element group carrying the PDCCH can carry its own demodulation reference signal (DMRS). Quadrature phase shift keying (QPSK) modulation can be used for the PDCCH.

[0038] In a 5th generation wireless communication system, a list of search space settings is signaled by the gNB for the configured bandwidth part (BWP), which is uniquely identified by an identifier for each search setting. For example, an identifier to identify the search space settings to be used for specific purposes, such as paging reception, SI reception, or random access response reception, may be explicitly signaled to the terminal by the gNB. The NR search space settings may include parameters monitoring periodicity-PDCCH-slot, monitoring offset-PDCCH-slot, monitoring symbol-PDCCH-in-slot, and / or duration. The UE may determine (or perform) PDCCH monitoring within the slot using the PDCCH monitoring periodicity (monitoring periodicity-PDCCH-slot), PDCCH monitoring offset (monitoring offset-PDCCH-slot), and PDCCH monitoring pattern (monitoring symbol-PDCCH-in-slot) parameters. In the case of PDCCH monitoring, it exists in slots from 'x' to x+duration, where the slot 'x' in the radio frame of number 'y' satisfies the following equation:

[0039] (y*(number of slots in radio frame) + x - monitoring offset-PDCCH-slot) mod (monitoring periodicity-PDCCH-slot) = 0;

[0040] The start symbol for PDCCH monitoring can be given by the monitoring symbol-PDCCH-in-slot. The length of PDCCH monitoring (in symbols) can be given by the core set associated with the search space. The search space setting may include an identifier for the associated core set configuration. For each configured BWP, there is a list of core set configurations signaled by the gNB, where each core set configuration can be uniquely identified by an identifier. Each radio frame can have a duration of 10 ms. Radio frames can be identified by a radio frame number or a system frame number. Each radio frame consists of multiple slots, and the number of slots within the radio frame and the duration of the slots may depend on the subcarrier spacing. The number of slots within the radio frame and the duration of the slots for each supported SCS (subcarrier spacing) are predefined in the NR. Each core set configuration can be associated with a list of TCI (transmission configuration indication) states. A single DL RS (reference signal) ID (identity) (e.g., SSB or CSI RS (channel state information reference signal)) can be configured per TCI state. A list of TCI states corresponding to the core set configuration can be signaled (or configured) by the gNB via an RRC signal. One of the TCI state lists can be activated and indicated (or indicated) to the UE via a MAC (medium access control) CE (control element) by the base station (e.g., gNB). The TCI state can indicate the DL TX beam used by the base station (e.g., gNB) for the transmission of the PDCCH in the search space PDCCH monitoring cases (e.g., the DL TX beam is quasi-co-located with the SSB / CSI RS of the TCI state).For a PDSCH (physical downlink share channel), the TCI status of the scheduled PDCCH can be used for the scheduled PDSCH. As another example, the TCI status of the PDCCH for the lowest core set ID in the slot can be used for the PDSCH. As yet another example, a combination of an RRC message, MAC CE, and DCI can be used to indicate the TCI status for a PDSCH. The RRC message sets a list of TCI statuses, MAC CE indicates a subset of TCI statuses from the set list, and DCI can indicate a single TCI status from the list (e.g., subset) of TCI statuses indicated by MAC CE.

[0041] Bandwidth adaptation (BA) in 5th generation wireless communication systems: BA is supported in 5th generation wireless communication systems. With BA, the transmit and receive bandwidth of the UE does not need to be as large as the cell's bandwidth and can be adjusted.

[0042] For example, bandwidth may be instructed to change (e.g., to be reduced during periods of low activity to save power); position may be shifted in the frequency domain (e.g., to increase scheduling flexibility); subcarrier spacing may be instructed to change (e.g., to allow for different services).

[0043] According to one embodiment, a subset of the total cell bandwidth of a cell may be referred to as a bandwidth part (BOP). The BA may be performed by setting BWP(s) for a UE that is in an RRC connection state and notifying the UE of the active BWP among the set BWPs.

[0044] According to one embodiment, when a BA is configured, the UE only needs to monitor (or monitor) the PDCCH at one active BWP. That is, the terminal may not need to monitor the PDCCH across the entire DL frequency of the serving cell. In an RRC connection state, the UE may receive one or more DL BWPs and / or UL BWPs for each configured serving cell (i.e., PCell or SCell). In an active serving cell, there may always be one active UL BWP and one active DL BWP at any given time. BWP switching for the serving cell may be used to enable an inactive BWP and simultaneously disable an active BWP.

[0045] According to one embodiment, BWP switching may be controlled by a PDCCH indicating a downlink allocation or uplink grant, or by a MAC entity at the start of a bwp-InactivityTimer, an RRC signal, or a random access procedure. When a SpCell is added or a SCell is activated, the DL BWP and UL BWP indicated by firstActiveDownlinkBWP-Id and firstActiveUplinkBWP-Id, respectively, may be activated without receiving a PDCCH indicating a downlink allocation or uplink grant. The active BWP for a serving cell may be indicated by at least one of the RRC or PDCCH. For unpaired spectrum, the DL BWP is paired with the UL BWP, and it may be common for BWP switching to apply to both the UL and the DL. When the BWP inactivity timer expires, the UE may switch the active DL BWP to the default DL BWP or the initial DL BWP (if the default DL BWP is not configured).

[0046] Random access in 5th generation wireless communication systems: Random access (RA) may be supported in 5G wireless communication systems. Random access (RA) can be used to achieve uplink (UL) time synchronization. RA can be used for UE initial access, handover, RRC (Radio Resource Control) connection re-establishment procedures, SR (Scheduling Request) transmission, SCG (Secondary Cell Group) addition / modification, beam failure recovery, and / or transmission of UL data or control information by a UE connected to the RRC but in an asynchronous state.

[0047] CBRA (Contention Based Random Access): CBRA can be referred to as 4-Step CBRA or 4-Step Random Access. In this type of random access, the UE first transmits a Random Access Preamble (Msg1) and then monitors for a RAR in the RAR (Random Access Response) window. The RAR can be referred to as Msg2 (Message 2). The next-generation node B (gNB) transmits the RAR on the Physical Downlink Shared Channel (PDSCH). The PDCCH that schedules the PDSCH carrying the RAR is addressed by the RA-RNTI (RA-radio network temporary identifier). The RA-RNTI identifies the time-frequency resource (also called PRACH (Physical RA Channel) occasion, PRACH(TX) occasion, or RO) at which the RA preamble was detected by the gNB. RA-RNTI is calculated as RA-RNTI = 1 + s_id + 14*t_id + 14*80*f_id + 14*80*8*ul_carrier_id, where s_id is the index of the first OFDM (Orthogonal Frequency Division Multiplexing) symbol of the PRACH occasion in which the UE transmitted Msg1, i.e., the RA preamble (0 ≤ s_id < 14). t_id is the index of the first slot of the PRACH occasion (0 ≤ t_id < 80), and f_id is the index of the PRACH Occasion in the frequency domain within the slot (0 ≤ f_id < 8). ul_carrier_id is the UL carrier used for Msg1 transmission, having a value of 0 for a Normal UL carrier and 1 for a Supplementary UL (SUL) carrier.Multiple RARs for various random access preambles detected by the gNB may be multiplexed by the gNB in ​​the same RAR MAC protocol data unit (PDU). A RAR in the MAC PDU may be considered (or identified) as corresponding to the terminal's RA preamble transmission if it contains the random access preamble identifier (RAPID) of the random access preamble transmitted by the terminal. If the UE does not receive a RAR corresponding to its RA preamble transmission within the RAR window and has not yet transmitted the RA preamble a set number of times (set by the gNB in ​​the RACH configuration), the UE may return to the first step, namely the Random Access Resource selection step, select a preamble / RACH occasion, and transmit the RA preamble. Backoff may be applied before returning to that first step.

[0048] When the terminal receives a RAR corresponding to its RA Preamble transmission, it may transmit Message 3 (Msg3) from the UL grant received in the RAR. Msg3 includes messages such as an RRC connection request, an RRC connection re-establishment request, an RRC handover confirm, a scheduling request, and / or an SI request, and may include a UE identity (e.g., a cell-radio network temporary identifier (C-RNTI) or an SAE (system architecture evolution)-temporary mobile subscriber identity (S-TMSI) or a random number). After transmitting Msg3, the UE may start a contention resolution timer. While the contention resolution timer is running, if the UE receives a Physical Downlink Control Channel (PDCCH) directed to the C-RNTI included in Msg3, it is determined that contention resolution has been successful, the contention resolution timer is stopped, and the RA procedure can be completed. When the contention resolution timer receives a CE (contention resolution MAC control element) containing the UE's contention resolution identity (the first X bit of the CCCH (common control channel) service data unit (SDU) transmitted in Msg3) while the contention resolution timer is running, the contention resolution is considered successful, the contention resolution timer is stopped, and the RA procedure is completed.If the contention resolution timer expires and the terminal fails to transmit the RA preamble a configurable number of times, the terminal may return to the first step, the random access Resource (preamble / RACH occasion), to transmit the RA preamble. Backoff may be applied before returning to the first step.

[0049] Contention-free random access (CFRA): CFRA may be referred to as legacy CFRA or 4-step CFRA. The CFRA procedure can be used in scenarios requiring low latency, such as handover, timing advance establishment for a secondary cell (Scell), and / or allocation by a gNB (node ​​B) to a UE-dedicated random access preamble. The UE transmits a dedicated RA preamble. The gNB transmits a RAR for a PDSCH addressed by RA-RNTI. The RAR carries the RA preamble identifier and timing alignment information (e.g., timing advance (TA) information). The RAR may also include UL grants. The RAR is transmitted within the RAR window, similar to the Contention-Based RA (CBRA) procedure. CFRA is considered successfully completed upon receiving a RAR containing the RA Preamble Identifier (RAPID) of the RA preamble transmitted by the terminal. If RA is initiated for beam failure recovery, CFRA may be considered (or identified) to have successfully completed when a PDCCH addressed to C-RNTI is received in the search space for beam failure recovery. If the UE does not receive a RAR until the RAR window expires, RA may be considered (or identified) to have not successfully completed. In this case, if the RA preamble is not repeated and transmitted a sufficient number of times as set (set as gNB in ​​the RACH configuration), the UE may retransmit the RA preamble.

[0050] In the event of specific events such as handover and beam failure recovery, if dedicated preamble(s) are assigned to the UE, during the first phase of random access—that is, during the selection of random access resources for Msg1 transmission—the UE may decide whether to transmit the dedicated preamble or the non-dedicated preamble. Dedicated preambles can generally be provided for a subset of SSBs / CSI-RSs. If there are no SSBs / CSI-RSs among those provided with contention-free random access resources (i.e., dedicated preambles / Ros(RACH occasions)) in the gNB whose DL RSRP (reference signal received power) is above a threshold, the UE selects the non-dedicated preamble. Otherwise, the UE may select the dedicated preamble. Thus, during the RA procedure, one random access attempt may be CFRA and another random access attempt may be CBRA.

[0051] According to one embodiment, a two-step contention-based random access (2-step CBRA): In the first step, the UE transmits a random access preamble on the PRACH and transmits a payload (e.g., MAC PDU) on the PUSCH. The transmission of the random access preamble and payload may also be referred to as MsgA (message A). In the second step, after transmitting MsgA, the UE may monitor for a response from the network (i.e., gNB) within a set window. This response may also be referred to as MsgB (message B). The base station (e.g., gNB) may transmit MsgB on the PDSCH. The PDCCH scheduling the PDSCH carrying MsgB may be designated as MsgB-RNTI. MSGB-RNTI can be used to identify the time-frequency resource (also referred to as the physical RA channel (PRACH) time or the PRACH transmission (TX) time or the RA channel (RACH) time) at which the RA frame is detected by the gNB.

[0052] For example, MSGB-RNTI is calculated as follows: RA-RNTI = 1 + s_id + 14 * t_id + 14 * 80 * f_id + 14 * 80 * 8 * ul_carrier_id + 14 x 80 x 8 x 2, where s_id is the index of the first OFDM symbol at the PRACH time when the UE transmitted Msg1, i.e., the RA preamble (0 <= s_id < 14), t_id is the index of the first slot at the PRACH time (0 <= t_id < 80), f_id is the index of the PRACH time within the slot in the frequency domain (0 <= f_id < 8), and ul_carrier_id may be the UL carrier used for Msg1 transmission (0 for NUL carrier, 1 for SUL carrier).

[0053] If a CCCH SDU is transmitted as the MsgA payload, the UE can perform contention resolution using the contention resolution information in MsgB. If the contention resolution ID received in MsgB matches the first 48 bits of the CCCH SDU transmitted in MsgA, contention resolution may be successful. If a C-RNTI is transmitted as the MsgA payload, contention resolution may be successful if the UE receives a PDCCH addressed to the C-RNTI. If contention resolution is successful, the random access procedure may be considered (or identified) to have been successfully completed. Instead of contention resolution information corresponding to the transmitted MsgA, MsgB may contain fallback information corresponding to the random access preamble transmitted in MsgA. If fallback information is received, the UE can transmit Msg3 and perform contention resolution using Msg4, as in the CBRA procedure. If contention resolution via fallback fails (i.e., by sending Msg3), the UE may retransmit MsgA. If, after sending MsgA, the configuration window for the UE to monitor network responses expires and the UE does not receive MsgB containing contention resolution or fallback information as described above, the UE may retransmit MsgA. If the random access procedure is not successfully completed even after sending the message a configurable number of times, the UE may return to the 4-Step RACH procedure. That is, the UE may only send the PRACH preamble.

[0054] The MsgA payload may include one or more of the following: a CCCH (common control channel) SDU (service data unit), a DCCH (dedicated control channel) SDU, a DTCH (dedicated traffic channel) SDU, a BSR (buffer status report) MAC CE, a PHR (power headroom report) MAC CE, SSB information, a C-RNTI MAC CE, or padding. In the first stage, the MsgA may include a UE ID (e.g., random ID, S-TMSI, C-RNTI, resumption ID, etc.) along with a preamble. The UE ID may be included within the MAC PDU (protocol data unit) of the MsgA. UE IDs such as C-RNTI may be included in the MAC CE, and MAC CE may be included in the MAC PDU. Other UE IDs (random ID, S-TMSI, C-RNTI, resumption ID, etc.) may be carried in the CCCH SDU. The UE ID can be a random ID, S-TMSI, C-RNTI, resume ID, IMSI, idle mode ID, inactive mode ID, etc.

[0055] The UE ID may differ in different scenarios where the UE performs the RA procedure. When the UE performs the RA after powering on (before connecting to the network), the UE ID may be a random ID. When the UE performs the RA while idle after connecting to the network, the UE ID may be S-TMSI. If the UE has a C-RNTI assigned (e.g., connected state), the UE ID may be C-RNTI. If the UE is in an inactive state, the UE ID may be the resumption ID. In addition to the UE ID, some additional control information may be sent to the MsgA. The control information may be included in the MAC PDU of the MsgA. The control information may include connection request indications, connection resumption request indications, SI request indications, buffer status indications, beam information (such as one or more DL TX beam IDs or SSB IDs), beam failover indications / information, data indicators, cell / BS / TRP switching indications, connection re-establishment indications, reconfiguration complete messages, and / or handover complete messages.

[0056] 2-Step Contentless Random Access (2-Step CFRA): In this case, the gNB may allocate dedicated random access preamble(s) and PUSCH resource(s) for MsgA transmission to the UE. The RO(s) to be used for preamble transmission may also be specified. In the first step, the UE may use contentless random access resources (e.g., dedicated preamble / PUSCH resource / RO) to transmit the random access preamble to PRACH and the payload to PUSCH. In the second step, after MsgA transmission, the UE may monitor the response from the network (e.g., gNB) within the configured window. The response may be referred to as MsgB.

[0057] A base station (e.g., gNB) can transmit MsgB over a PDSCH. A PDCCH that schedules a PDSCH carrying MsgB can be addressed by MsgB-RNTI. MSGB-RNTI can be used to identify the time-frequency resource (also referred to as the physical RA channel (PRACH) time or PRACH transmission (TX) time or RA channel (RACH) time) at which an RA frame is detected by the gNB.

[0058] For example, MSGB-RNTI is calculated as follows: RA-RNTI = 1 + + s_id + 14 * t_id + 14 * 80 * f_id + 14 * 80 * 8 * ul_carrier_id + 14 x 80 x 8 x 2, where s_id is the index of the first OFDM symbol at the PRACH time when the UE transmitted Msg1, i.e., the RA preamble, and 0 <= s_id < 14; t_id is the index of the first slot at the PRACH time (0 <= t_id < 80), f_id is the index of the PRACH time within the slot in the frequency domain (0 <= f_id < 8), and ul_carrier_id is the UL carrier used for Msg1 transmission (0 for NUL carrier, 1 for SUL carrier).

[0059] If the UE receives a PDCCH addressed to C-RNTI, the random access procedure may be considered (or identified) to have been successfully completed. If the UE receives fallback information corresponding to the transmitted preamble, the random access procedure may be considered (or identified) to have been successfully completed.

[0060] In the case of specific events such as handover and beam failure recovery where dedicated preamble(s) and PUSCH resource(s) are assigned to the UE, the UE can decide whether to transmit a dedicated preamble or a non-dedicated preamble during the first step of random access, namely, the selection of random access resources for MsgA transmission. Dedicated preambles are typically provided to a subset of SSBs / CSI RSs. If, among the SSBs / CSI RSs for which contention-free random access resources (i.e., dedicated preamble / ROs / PUSCH resources) are provided by the gNB, there are no SSBs / CSI RSs with a DL RSRP above a threshold, the UE can select a non-dedicated preamble. Otherwise, the UE can select a dedicated preamble. Thus, during the RA procedure, one random access attempt may be a 2-Step CFRA and another random access attempt may be a 2-Step CBRA.

[0061] When a random access procedure is initiated, the UE may first select a carrier (e.g., SUL or NUL). If the carrier to be used for the random access procedure is explicitly signaled by the gNB, the UE may select the signaled carrier to perform the random access procedure. If the carrier to be used for the random access procedure is not explicitly signaled by the gNB, and if the serving cell for the random access procedure is configured to have a supplementary uplink and the RSRP of the downlink path loss reference is less than rsrp-ThresholdSSB-SUL, the UE may select a SUL carrier to perform the random access procedure. Otherwise, the UE may select a NUL carrier to perform the random access procedure. After selecting the UL carrier, the UL BWP and / or DL ​​BWP for the random access procedure may be determined as specified in Section 5.15 of TS 38.321. Subsequently, the UE may determine whether to perform a 2-Step or 4-Step RACH for the random access procedure.

[0062] - If the random access procedure is initiated by the PDCCH order and the ra-PreambleIndex explicitly provided by the PDCCH is not 0b000000, the UE may select 4Step RACH.

[0063] - Otherwise, if a random access resource without 2-step contention for the random access procedure is signaled by the gNB, the UE can select 2-step RACH.

[0064] - Otherwise, if a random access resource without 4-step contention for the random access procedure is signaled by gNB, the UE can select 4-step RACH.

[0065] - Otherwise, if the UL BWP selected for the random access procedure consists only of 2-Step RACH resources, the UE can select 2-Step RACH.

[0066] - Otherwise, if the UL BWP selected for the random access procedure consists only of 4-Step RACH resources, the UE can select 4-Step RACH.

[0067] Otherwise, if the UL BWP selected for this random access procedure consists of both 2-Step and 4-Step RACH resources,

[0068] - If the RSRP of downlink path loss is below the configured threshold, the UE can select 4-Step RACH. Otherwise, the UE selects 2-Step RACH.

[0069] Paging in 5th Generation Wireless Communication Systems: In 5th generation (also known as NR or New Radio) wireless communication systems, a UE can be in one of the following RRC states: RRC IDLE, RRC INACTIVE, and RRC CONNECTED.

[0070] The description of the RRC status can be as follows:

[0071] - In the RRC_IDLE state, UE-specific DRX (discontinuous reception) can be configured by the upper layer (i.e., NAS (non-access stratum)). The UE can monitor short messages transmitted to the P-RNTI via the DCI. The UE can monitor the paging channel for CN paging using 5G-S-TMSI. The UE can perform neighbor cell measurement and cell (re)selection. The UE can acquire system information and send SI requests (if configured).

[0072] - In the RRC_INACTIVE state, a UE-specific DRX can be configured by the upper layer or the RRC layer. In this state, the UE saves the UE inactive AS context. A RAN (radio access network)-based alert region is established by the RRC layer. The UE can monitor short messages transmitted to P-RNTI via the DCI. The UE can monitor paging channels for RAN paging using 5G-S-TMSI and fullI-RNTI. The UE can perform neighbor cell measurements and cell (re)selection. The UE can perform RAN-based alert region updates periodically and when moving out of the established RAN-based alert region. The UE can acquire system information and send SI requests (if configured).

[0073] - In RRC_CONNECTED, the UE can store the AS context. Unicast data is transmitted and received with the UE. At the lower layer, the UE can be configured with a UE-specific DRX. If configured, the UE can monitor short messages transmitted to the P-RNTI via the DCI. The UE can monitor the control channel associated with the shared data channel to determine if data is scheduled for it. The UE can provide channel quality and feedback information. The UE can perform neighbor cell measurements and measurement reports, and acquire system information.

[0074] An NR-based 5G or next-generation wireless access network (NG-RAN) is composed of NG-RAN nodes, for example, an NG-RAN node as a gNB that can provide NR user plane and control plane protocol endpoints toward UEs. The gNB can also be connected to the 5G core (5GC), more specifically the access and mobility management function (AMF), via an NG-C interface, and to user plane function (UPF) entities via an NG-U interface.

[0075] According to one embodiment, in a 5th generation (also known as NR or New Radio) wireless communication system, a UE may use discontinuous reception (DRX) in the RRC_IDLE and RRC_INACTIVE states to reduce power consumption. In the RRC_IDLE / RRC_INACTIVE state, the UE may wake up briefly at regular intervals (i.e., each DRX cycle) to receive paging, SI update notifications, and / or emergency notifications. Paging messages may be transmitted to the UE using a PDSCH. The PDSCH may be addressed based on a paging RNTI (P-RNTI) if there is a paging message on the PDSCH. The P-RNTI may be common to all UEs. To indicate paging for a specific UE, the paging message may include a UE ID (i.e., S-TMSI for an RRC_IDLE UE or I-RNTI for an RRC_INACTIVE UE). The paging message may include multiple UE IDs to page for multiple UEs.

[0076] According to one embodiment, paging messages are broadcast (e.g., PDCCH is masked with P-RNTI) and can be transmitted through a data channel (e.g., PDSCH). SI updates and emergency notifications may be included in the DCI, and the PDCCH carrying the DCI may be addressed based on P-RNTI.

[0077] In RRC idle / inactive mode, the UE can monitor one paging occasion (PO) per DRX cycle. In RRC idle / inactive mode, the UE can monitor the PO in the initial DL BWP. In RRC connected state, the UE can monitor one or more POs to receive SI update notifications and emergency notifications. In RRC connected state, the UE can monitor any PO of the paging DRX cycle and monitor at least one PO during the SI modification period. In RRC idle / inactive mode, the UE can monitor the PO in the active DL BWP per DRX cycle. A PO may be a set of 'S' PDCCH monitoring occasions, which is the number of SSBs (e.g., synchronization signals and PBCH (physical broadcast channel) blocks) transmitted from the cell. The UE can first determine a paging frame (PF) and determine a PO for the determined PF. A single PF may be a radio frame (10ms).

[0078] - The PF for the UE may be a radio frame having a system frame number 'SFN' satisfying the equation (SFN + PF_offset) mod T = (T div N) * (UE_ID mod N).

[0079] - The index (i_s) representing the index of the PO can be determined by i_s = floor(UE_ID / N) mod Ns.

[0080] - T can be the UE's DRX cycle.

[0081] - In the RRC_INACTIVE state, T can be determined by the minimum of the UE-specific DRX value configured by RRC, the UE-specific DRX value configured by NAS (non-access stratum), and the default DRX value broadcast from system information.

[0082] - In the RRC_IDLE state, T can be determined by the minimum of the UE-specific DRX value configured by the NAS and the default DRX value broadcast from the system information. If the UE-specific DRX is not configured by the upper layer (i.e., the NAS), the default value may be applied.

[0083] - N: Total number of paging frames in T

[0084] - Ns: Number of paging opportunities for PF

[0085] - PF_offset: Offset used to determine PF

[0086] - UE_ID: 5G-S-TMSI mod 1024

[0087] - Ns, nAndPagingFrameOffset, and the default DRX cycle length can be set in SIB1. The values ​​for N and PF_offset can be derived from the nAndPagingFrameOffset parameter as defined in TS 38.331. If there is no 5G-S-TMSI, such as when the UE is not yet registered with the network, the default identity UE_ID = 0 must be used in the above PF and i_s formulas.

[0088] - The opportunity for PDCCH monitoring for paging can be determined based on the paging-SearchSpace configuration signaled by the gNB.

[0089] - If SearchSpaceId = 0 is configured for pagingSearchSpace, the PDCCH monitoring opportunity for paging is for the RMSI, as defined in Clause 13 of TS 38.213. If SearchSpaceId = 0 is configured for pagingSearchSpace, Ns is 1 or 2. If Ns = 1, there is only one PO starting from the first PDCCH monitoring opportunity for paging in the PF. If Ns = 2, the PO is in the first frame (i_s = 0) or second frame (i_s = 1) of the PF.

[0090] - If a non-zero SearchSpaceId is configured for pagingSearchSpace, the UE can monitor the (i_s + 1)th PO. PDCCH monitoring opportunities for paging can be determined based on the paging-SearchSpace configuration signaled by the gNB. PDCCH monitoring opportunities do not overlap with UL symbols determined according to tdd-UL-DL-ConfigurationCommon, and they are numbered sequentially starting from the first PDCCH monitoring opportunity for paging in the PF. The gNB can set the firstPDCCH-MonitoringOccasionOfPO parameter for each PO corresponding to each PF. If firstPDCCH-MonitoringOccasionOfPO is signaled (or configured), the (i_s + 1)th PO may be a set of 'S' consecutive PDCCH monitoring opportunities for paging starting from the PDCCH monitoring opportunity number indicated by firstPDCCH-MonitoringOccasionOfPO (i.e., the (i_s + 1)th value of the firstPDCCH-MonitoringOccasionOfPO parameter). Otherwise, the (i_s + 1)th PO may be a set of 'S' consecutive PDCCH monitoring opportunities starting from the (i_s * S)th PDCCH monitoring opportunity for paging. 'S' may be the number of actual transmitted SSBs determined by the parameter ssb-PositionsInBurst signaled in SystemInformationBlock1 (e.g., SIB1) received from the gNB. The first-PDCCH-MonitoringOccasionOfPO parameter is signaled in SIB1 for paging in the initial DL BWP.For paging in DL BWPs other than the initial DL BWP, the first-PDCCH-MonitoringOccasionOfPO parameter is signaled in the corresponding BWP configuration.

[0091] In 5G NR, paging enhancement features were introduced, which can be referred to as Paging Early Indication (PEI) for UE power saving. Previously, in scenarios where only false paging or very infrequent paging existed, the battery could be rapidly drained as the UE consumed high power while attempting to receive and monitor paging.

[0092] The concept of Early Paging Indication (PEI) is that if a UE provides advance notice of its Paging Opportunity (PO), it indicates whether the UE needs to monitor it. This allows the UE to skip time-frequency synchronization prior to the PO if monitoring is not required. PEI can be signaled via downlink control information messages or reference signals included in the PDCCH.

[0093] Another important aspect related to PEI is that base stations can provide subgrouping information to UEs, dividing UEs that share the same paging opportunity into subgroups. When paging is performed based on subgrouping information, the group paging rate can be lowered, and false paging alarms can also be reduced.

[0094] According to one embodiment, the PEI can be signaled via a DCI or a reference signal. For example, SIB 1 can be used as a PEI setting IE to inform the UE about the PEI setting. That is, SIB1 can contain setting information for the PEI.

[0095] For example, DCI-based Early Paging Indications (PEI) may be a preferred option as they can flexibly include subgroup indications and potentially contain short messages and other information. A PEI can be referred to as a limited-size DCI search space or sequence transmitted from the gNB prior to each paging opportunity. UEs in an idle or inactive state can monitor the PEI search space and, if an existing PEI indication is detected, monitor the next PO. Otherwise, the UE can enter a deep sleep to skip or omit PO detection. The achievable power saving gains can be attributed to the more limited PEI search space compared to the actual paging PDCCH. Therefore, PEI reduces unnecessary paging opportunity decoding for non-paged UEs, which means false paging alarms can be reduced.

[0096] PEI DCI or sequences can be defined for UEs in an idle / inactive state within a specific group. Specifically, UEs in an idle / inactive state are subdivided into multiple paging groups, and PEI DCI can be scrambled on a group-by-group basis. Therefore, if an idle / inactive mode UE decodes the PEI DCI (downlink control information) using its own paging group scrambling code and calculates an invalid cyclic redundancy check, it can assume that the transmitted PEI is intended for one or more other paging groups; consequently, the PO can be skipped, thereby further reducing false paging alarms.

[0097] CN (core network) control subgrouping: The AMF (access and mobility management function) entity may be responsible for assigning subgroup IDs to UEs. The total number of subgroups in CN control subgrouping can be configured up to eight, which is determined by the OAM. The AMF entity may transmit subgroup IDs to UEs via NAS signaling. The AMF entity may notify a base station (e.g., gNB) of the assigned subgroup ID to page a UE in the RRC_IDLE / RRC_INACTIVE state. When a paging message for a UE is transmitted (or forwarded) from the CN to the gNB or generated by the base station (e.g., gNB), the base station (e.g., gNB) may determine the PEI opportunity associated with the PO for the UE. Before the UE is paged from the PO, the base station (e.g., gNB) transmits the associated PEI and, if supported by the UE(s), may indicate the subgroup(s) of the UE(s) to be paged from the PEI.

[0098] UE ID-based subgrouping: The gNB and the UE can determine (or identify) a subgroup ID based on the UE ID and the total number of subgroups for UE ID-based subgrouping within the cell. The total number of subgroups for UE ID-based subgrouping is determined by the base station (e.g., gNB) for each cell and may differ in different cells. The base station (e.g., gNB) can broadcast the total number of subgroups for UE ID-based subgrouping within the cell. When a paging message for a UE is transmitted (or forwarded) from the CN to the gNB or generated by the base station (e.g., gNB), the base station (e.g., gNB) can determine the PEI opportunity associated with the PO for the UE. Before the UE is paged from the PO, the gNB transmits the associated PEI and, if supported by the UE(s), indicates the subgroup(s) of the UE(s) to be paged from the PEI. In SIB1, information related to the PEI configuration (e.g., configuration information for the PEI) may be transmitted to the UE. For example, configuration information for PEI may include information related to the PEI search space, DCI 2_7 information, SS (synchronization signal) indexing, UE-based subgrouping information and / or information related to configuring PEI and subgrouping in the UE side and gNB sublayers (e.g., information for configuring PEI and subgrouping in the sublayers of the UE and gNB, respectively).

[0099] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system, and in particular, to a method and apparatus for supporting the transmission and reception of a Low Power Wake Up Signal (LP-WUS) and a Paging Early Indication (PEI) signal of a terminal and a base station in an environment where the base station and the terminal can transmit a Wake Up Signal (WUS) to wake up the terminal or cells when the transceiver of a terminal, base station, or cell enters sleep mode in a system using a next-generation Low Power Radio (LR) that supports power saving technology.

[0100] Meanwhile, mobility support methods and devices utilizing terminal location information in non-terrestrial network systems have been proposed, and for terminals capable of utilizing these methods, the need has arisen for mobility support methods that use relative location measurement between the terminal and the network, which differs from existing signal strength-based methods.

[0101] The present disclosure aims to provide a signal transmission method and apparatus that support idle and inactive mode operations of a terminal using a wake-up radio capable of transmitting and receiving a low-power wake-up signal to support power saving mode operation of a network in a wireless communication system.

[0102] A terminal according to one embodiment of the present disclosure may include, depending on certain conditions, receiving a reference signal from adjacent cells and base stations via WUR (wake up radio) and New Radio (NR), receiving a signal including certain trigger conditions from a base station, determining whether a measured value of the reference signal corresponds to the said conditions, determining the trigger conditions, and operating one RAT (radio access technology) in a low-power mode.

[0103] The technical problems to be solved in the various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0104] According to one embodiment of the present disclosure, when one or more RATs are used in a wireless communication system, power consumption of the terminal can be further reduced by operating one RAT in a low-power mode.

[0105] FIG. 1 is a diagram illustrating the structure of a next-generation mobile communication system that supports network energy saving according to one embodiment of the present disclosure.

[0106] Referring to FIG. 1, a next-generation mobile communication system that supports network energy saving may be composed of a next-generation base station (1-01, g Node B, hereinafter gNB, Node B or base station), a cell (1-06, 1-07, 1-08), and / or a terminal (1-09, User Equipment (UE)). For example, the gNB may be composed of a CU (1-02, Central Unit) and one or more DUs (1-03, 1-04, Distributed Units). For example, the base station (e.g., gNB) may have a split structure and may include a CU (1-02) and a plurality of DUs (e.g., a first DU (1-03), a second DU (1-04)) connected to the CU (1-02) through an interface.

[0107] For example, one CU (e.g., CU (1-02)) can support one or more DUs (e.g., first DU (1-03), second DU (1-04)), and one DU (1-03, 1-04) can support one cell (1-06, 1-07, 1-08) or one or more cells (1-06, 1-07, 1-08).

[0108] For example, one cell may include a radio unit (RU). For example, the first cell (1-06) may be the first RU, the second cell (1-07) may be the second RU, and the third cell (1-08) may be the third RU.

[0109] According to one embodiment, the UE (1-09) can access an external network (e.g., an AMF entity) through the cell via the gNB. For example, the UE (1-09) can exchange information with entities of the core network (e.g., an AMF entity, a UPF entity) through the base station (e.g., a gNB (1-01)).

[0110] According to one embodiment, the CU (1-02) may include a CU-CP (Central Unit - Control Plane) that handles the RRC (radio resource control) layer and several CU-UP (Central Unit - User Plane) for handling data packets from terminals. DUs (e.g., a first DU (1-03), a second DU (1-04)) may be connected to a single CU (1-02) to form a RAN node. A single CU (1-02) and a single DU (1-03, 1-04) may be connected to each other through an interface between base station internal functions, such as an F1 or W1 interface.

[0111] FIG. 2 is a drawing illustrating the concept of a Low Power Radio (LR) of a base station or cell according to an embodiment of the present disclosure. (Including base station-terminal WUR)

[0112] Referring to FIG. 2, a base station supporting the WUR (Wake Up Radio) function may be referred to as a WUR BS (2-1), and a terminal supporting the WUR (Wake Up Radio) function may be referred to as a WUR UE (2-4). For example, the WUR BS (2-1) may include a Main Radio (2-2, MR) for performing wireless communication with the WUR UE (2-4) and a WUR (2-3) for performing a Wake Up operation. For example, the WUR UE (2-4) may include a Main Radio (2-5, MR) for performing wireless communication with the WUR BS (2-1) and a WUR (2-6) for performing a Wake Up operation. At this time, the MR (2-2) of the WUR BS (2-1) can perform wireless communication with the MR (2-5) of the WUR UE (2-4) or other UE, and the WUR (2-3) of the WUR BS (2-1) can perform wireless communication with the WUR (2-6) of the WUR UE (2-4).

[0113] According to one embodiment, WUR may be a module that is physically one but logically distinct, rather than two physically different modules as part of MR. For example, MR and WUR may each correspond to a physical transceiver and may be physically distinct circuits. As another example, MR and WUR may each not be physically distinct but may be logically distinct modules (e.g., software modules) within a single physical circuit.

[0114] According to one embodiment, WUR may be part of MR both physically and logically.

[0115] According to one embodiment, WUR may be referred to as LP-WUR by adding Low Power, or as LR (Low Power Radio) or LPR. That is, WUR may be referred to by various names. For example, WUR may be referred to by other terms that mean a signal for reducing energy consumption.

[0116] WUR BS (2-1) and WUR UE (2-4) may have the following operational configuration states.

[0117] 1. Full On state where both MR and WUR are turned on

[0118] 2. MR On state where only MR is turned on and WUR is off

[0119] 3. Deep Sleep state where MR is (wholly or partially) off and only WUR is on.

[0120] 4. Full Off state where MR and WUR are both turned off (all or part of it).

[0121] 5. Light Sleep state, in which MR is turned on but power is saved by not transmitting certain signals, such as broadcast signals like SSB and SIB.

[0122] The Deep Sleep mode of the terminal may be at least one of the following definitions.

[0123] - A mode in which the terminal turns off all or part of the circuits and operations related to MR, thereby being unable to perform wireless communication via MR and performing cellular wireless communication via LP-WUR.

[0124] - A mode in which the terminal turns off all or part of the circuits and operations related to MR for most of the time, so that it does not communicate wirelessly via MR and can only transmit and receive messages via LP-WUR, but during designated resources determined by the network (e.g., resources such as periodic paging occasions for transmitting and receiving paging), the terminal may briefly become active to perform reception via MR.

[0125] FIG. 3 illustrates an example of a WUS transmission procedure of a terminal according to one embodiment of the present disclosure. (LP-WUS and PEI config)

[0126] Referring to FIG. 3, the terminal (3-1) and the serving cell base station (3-2) may each include a Main Radio (MR) (3-3, 3-5) which can be represented as 5G NR and a Low Power Radio (LP-WUR) (3-4, 3-6). For example, the UE (3-1) may include a first MR (3-3) and / or a first LP-WUR (3-4). For example, the base station (3-2) (e.g., gNB) may include a second MR (3-5) and / or a second LP-WUR (3-6).

[0127] According to one embodiment, the base station (3-2) may transmit a signal containing LP-WUS configuration information and / or PEI configuration information for setting a signal to be received by the terminal (3-1) when performing a power saving operation using LP-WUR in step 3-7. For example, the signal may be included in a broadcast signal (e.g., a master information block (MIB) included in an SSB) or any system information block (SIB) that the base station (3-2) transmits to the terminal (3-1). That is, the LP-WUS configuration information and / or PEI configuration information may be transmitted to the terminal (3-1) via the MIB and / or SIB.

[0128] As another example, the signal may be transmitted by being included in a unicast signal (e.g., a radio resource control (RRC) signal, a medium access control (MAC) signal, or a PHY signal) that the base station (3-2) transmits to a specific terminal (3-1). For example, LP-WUS configuration information and / or PEI configuration information may be included in an RRC message, MAC CE, and / or PHY signal and delivered to the terminal (3-1).

[0129] According to one embodiment, terminals operating in Idle / Inactive mode may receive the signal of step 3-7 from a designated base station (e.g., base station (3-2)), and if a specific condition is satisfied based on the LP-WUS setting in the signal, they may start LP-WUS monitoring (3-9) or operate the first MR (3-3) in a designated sleep mode (step 3-8). For example, the signal of step 3-7 may trigger LP-WUS monitoring and switch the MR to sleep mode.

[0130] According to one embodiment, among the terminals operating in Idle / Inactive mode, terminals supporting PEI (e.g., terminal (3-1)) can receive the signal of step 3-7 from a designated base station (e.g., base station (3-2)), and can monitor and receive PEI based on the PEI setting in the signal (step 3-12).

[0131] According to one embodiment, when LP-WUS settings and PEI settings are received simultaneously, terminals supporting PEI (e.g., terminal (3-1)) receive LP-WUS (step 3-9), and when MR is performing LP-WUS monitoring, receive LP-WUS (step 3-10), wake up from sleep mode (3-11), and receive PEI (step 3-12). At this time, if a sub-group of the terminal (e.g., terminal (3-1)) is indicated (or indicated) within the PEI, the terminal may attempt to receive POs (Paging occasions), and may receive a paging message if paging is transmitted from the base station (step 3-13). For example, if the information regarding the sub-group included in the received PEI is that the terminal (3-1) is in the sub-group, the terminal (3-1) may monitor the POs and receive a paging message from the base station (3-2).

[0132] According to one embodiment, the LP-WUS signal (3-10) can be used as a downlink signal that triggers the following operation.

[0133] 1. When a terminal in Idle / Inactive mode receives a downlink LP-WUS signal, the downlink LP-WUS signal can be used as a trigger to cause the terminal to receive network paging at subsequent paging occasions. (e.g., paging monitoring trigger)

[0134] A. To this end, the base station (3-2) may transmit LP-WUS configuration information, including an indicator that informs the terminal (3-1) to perform the above-described operation (e.g., receiving / monitoring paging) when receiving LP-WUS, to the terminal (3-1) in advance via MR or LP-WUR. For example, the base station (3-2) may set configuration information including information about the indicator to the terminal (3-1), and the indicator may instruct the UE to perform an operation (e.g., receiving / monitoring paging) corresponding to the LP-WUS signal.

[0135] 2. When received by an Idle / Inactive mode terminal, the downlink LP-WUS signal can be used as a trigger to receive a PEI (Paging Early Indication) signal during the subsequent PEI signal reception period, which indicates that network paging is occurring. (e.g., trigger for PEI signal monitoring)

[0136] A. To this end, the base station (3-2) may transmit LP-WUS configuration information, including an indicator that informs the terminal (3-1) to perform the above-described operation (e.g., monitoring of PEI signals) when receiving the LP-WUS, to the terminal (3-1) in advance via MR or LP-WUR.

[0137] Referring to FIG. 3, the terminal (3-1) may save power by keeping the LP-WUR turned on, monitoring the LP-WUS through resources set by the base station (3-2), and operating (or switching) the MR (3-3) to sleep mode. Additionally, when the terminal (3-2) receives the LP-WUS to receive paging from the network, it may wake up the MR (3-3) and additionally monitor the PEI to obtain additional power saving benefits. For example, the terminal (3-1) can reduce power consumption by monitoring the LP-WUS and / or the PEI.

[0138] However, the network (e.g., base station (3-2), core network) may not know whether the terminal (3-1) operating in Idle / Inactive mode is currently operating the MR (3-3) in sleep mode and monitoring only the LP-WUS, or whether the terminal (3-1) has woken up the MR (3-3) because it does not meet the conditions, and which terminal supports PEI and wants to receive it. Therefore, a network that does not identify whether the MR is in sleep mode and whether the terminal supports PEI may have the burden of always transmitting LP-WUS signals and PEI signals to page a specific terminal (e.g., terminal (3-1)).

[0139] In addition, in the case of a terminal that simultaneously supports PEI, which also supports sub-grouping, even though there is an LP-WUS that supports sub-grouping, there may be unnecessary need to select the Paging Occasion through two stages of sub-grouping and attempt to receive Paging. Of course, if the sub-group size of the LP-WUS is sufficiently larger than the sub-group size of the PEI, only the second terminals selected for PEI among the first terminals waking up with the LP-WUS can monitor the PO. (When the number of first terminals is greater than the number of second terminals.) In this case, utility may be achieved by allowing only a smaller number of terminals to wake up and monitor the PO through two stages of selection processes.

[0140] However, since there may be terminals that do not monitor PEI, the base station (3-2) cannot set the size of the LP-WUS sub-group to be infinitely large, and if the size of the LP-WUS receiving sub-group is similar to or equal to the size of the PEI sub-group, this utility may be further reduced. In such cases, power consumed by the terminal to get up and receive PEI may be wasted, and the delay until monitoring PO may even increase.

[0141] To address these issues, the present disclosure proposes a method to reduce or minimize power waste and delay by changing the operation of a terminal through an indicator set by the network. However, the effects of the present disclosure are not limited thereto and may include various other effects.

[0142] FIG. 4 is a diagram illustrating an example of a Paging transmission procedure transmitted by a base station to a terminal according to an embodiment of the present disclosure. (Indication to ignore PEI)

[0143] Referring to FIG. 4, the terminal (4-1) and the serving cell base station (4-2) may each include a Main Radio (MR) (4-3, 4-5) which can be represented as 5G NR and a Low Power Radio, LP-WUR (4-4, 4-6). For example, the terminal (4-1) may include a first MR (4-3) and / or a first LP-WUR (4-4). For example, the base station (4-2) may include a second MR (4-5) and / or a second LP-WUR (4-6). Although the number of MRs and LP-WURs included in the terminal (4-1) and the base station (4-2) in this disclosure is described as one each, this is merely an example, and the terminal (4-1) and the base station (4-2) may include a plurality of MRs and / or a plurality of LP-WURs.

[0144] According to one embodiment, the base station (4-2) may transmit a signal containing LP-WUS setting information and / or PEI setting information for setting a signal to be received when the terminal (4-1) performs a power saving operation using LP-WUR (step 4-7). For example, the base station (4-2) may set the LP-WUS setting information and / or PEI setting information to the terminal (4-1) through MIB, SIB, RRC message, MAC CE, and / or PHY signal.

[0145] In the embodiment of FIG. 4 of the present disclosure, unlike FIG. 3, the base station (4-2) may include information regarding an indicator that instructs the terminal (4-1) not to perform PEI reception if a specific condition is satisfied within the signal in which the base station (4-2) transmits setting information (e.g., LP-WUS setting information and / or PEI setting information). For example, an indicator may be included within the LP-WUS setting information or PEI setting information that allows the terminal to save power by not performing PEI reception if a specific condition is satisfied.

[0146] According to one embodiment, the signal including the indicator may be a different signal from the signal of step 4-7. That is, information about the indicator (or the indicator) may be transmitted to the terminal (4-2) separately from the setting information.

[0147] According to one embodiment, the signal of step 4-7 may be included in a broadcast signal (e.g., a master information block (MIB) included in an SSB, or any system information block (SIB)) transmitted by the base station (4-2) to the terminal (4-1). For example, the signal of step 4-7 may be transmitted by being included in a unicast signal (e.g., an RRC signal, a MAC signal, or a PHY signal) transmitted by the base station (4-2) to the terminal (4-1).

[0148] According to one embodiment, terminals operating in Idle / Inactive mode may receive a signal from step 4-7 from any base station (e.g., base station (4-2)), and if a specific condition is satisfied based on the LP-WUS setting in the signal, they may start LP-WUS monitoring (step 4-9) or operate the MR (4-3) in a designated sleep mode (step 4-8).

[0149] According to one embodiment, a terminal (4-1) that simultaneously supports LP-WUS and PEI can receive LP-WUS settings and PEI settings simultaneously (or both, even if not simultaneously). When terminals that support PEI are performing LP-WUS monitoring (step 4-9), they can receive LP-WUS (4-10), wake the MR (4-3) from sleep mode (step 4-11), and then perform an operation to receive paging. In this case, if PEI can be ignored based on the indicator included in the signal of step 4-7, the terminal (4-1) can reduce power consumption by ignoring PEI (steps 4-12, 4-13) and receive the paging signal transmitted at the earliest possible time (step 4-14).

[0150] According to one embodiment, the indicator included in the LP-WUS setting signal (4-7) may instruct the terminal to ignore or receive PEI based on the following conditions.

[0151] - The terminal (4-1) can be configured to ignore PEI when monitoring the LP-WUS as shown in [Table 1] below.

[0152]

[0153] - The terminal (4-1) can be configured to ignore PEI when it receives LP-WUS as shown in [Table 2].

[0154]

[0155] - The terminal (4-1) may be configured to ignore PEI when it receives LP-WUS within a set timer as shown in [Table 3]. The timer may be a timer based on PEI resources. Or, the timer may be a timer based on PO. For example, the timer may be configured by MIB, SIB, RRC messages and / or MAC CE.

[0156]

[0157] - The terminal (4-1) can be configured to ignore PEI when serving cell measurement is offloading using LP-WUS as shown in [Table 4].

[0158]

[0159] - The terminal (4-1) may be configured to ignore PEI within a certain timer2 as shown in [Table 5]. timer2 may be a timer based on PEI resources. For example, timer2 may be a timer based on PO. For example, timer2 may be a timer that starts based on a specific condition. For example, the timer may be set by MIB, SIB, RRC messages and / or MAC CE.

[0160]

[0161] - According to one embodiment, the terminal (4-1) can be configured to always ignore PEI regardless of the status, such as LP-WUS monitoring.

[0162] - According to one embodiment, the terminal (4-1) may be configured to ignore PEI when the reference signal measurement value of any beam (e.g., RSRP (reference signal received power)) or the cell measurement value, etc., measured via MR (4-3) or LP-WUR (4-4) (or, LR (low power radio)) is greater than or equal to (or less than or equal to) the threshold value set by the network (or base station (4-2)). For example, the threshold value and the type of reference signal (e.g., CSI-RS (channel state information-reference signal, SSB (synchronization signal block)), etc., may be set in the signal of step 4-7. For example, information about the threshold value and / or information about the type of reference signal may be set by MIB, SIB, RRC message and / or MAC CE.

[0163] According to one embodiment, the terminal (4-1) may turn on the LP-WUR and monitor the LP-WUS through resources set by the base station (4-2), and may save power by operating the MR (4-3) in sleep mode. When the LP-WUS is received to receive paging from the network, the MR (4-3) is woken up and the PO is monitored immediately, thereby reducing the power consumed for PEI monitoring and enabling faster paging reception.

[0164] FIG. 5 is a diagram illustrating an example in which a terminal according to an embodiment of the present disclosure attempts to receive LP WUS and PEI in accordance with an agreement. (Implicit method)

[0165] Referring to FIG. 5, the terminal (5-1) and the serving cell base station (5-2) may each include a Main Radio (MR) (5-3, 5-5) which can be represented by 5G NR and a low-power radio, LP-WUR (5-4, 5-6). The base station (5-2) may transmit a signal containing LP-WUS setting information and / or PEI setting information for setting the signal to be received when the terminal (5-1) performs a power saving operation using LP-WUR (step 5-7). Step 5-7 of the present disclosure may correspond to step 4-7 of FIG. 4, and unless contradictory, the description of step 4-7 may be applied to step 5-7.

[0166] The difference between the embodiment of FIG. 5 of the present disclosure and the embodiments of FIG. 3 and FIG. 4 described above is that the terminal (5-1) can reduce power consumption by not performing PEI reception according to any rule defined in the standard or set in advance.

[0167] According to one embodiment, the signal of step 5-7 may be included in a broadcast signal (e.g., a master information block (MIB) included in an SSB, or any system information block (SIB)) transmitted by the base station (5-2) to the terminal (5-1). For example, the signal of step 5-7 may be transmitted by being included in a unicast signal (e.g., an RRC signal, a MAC signal, or a PHY signal) transmitted by the base station (5-2) to the terminal (5-1).

[0168] According to one embodiment, terminals operating in Idle / Inactive mode may receive the signal of step 5-7 from a designated base station (e.g., base station (5-2)), and if a specific condition is satisfied based on the LP-WUS setting in the signal, they may start LP-WUS monitoring (step 5-9) and / or operate the MR in any sleep mode (step 5-8).

[0169] According to one embodiment, a terminal (5-1) that simultaneously supports LP-WUS and PEI receives both LP-WUS settings and PEI settings simultaneously (or through different signals), and when terminals that support PEI are performing LP-WUS monitoring (step 5-9), they receive LP-WUS (step 5-10), wake MR (5-3) from sleep mode (step 5-11), and then perform an operation to receive paging.

[0170] Here, a terminal (5-1) that does not need to perform PEI reception according to any rule defined in the standard or pre-set can receive the paging signal transmitted at the earliest time by ignoring PEI (step 5-12, step 5-13).

[0171] According to one embodiment, the terminal (5-1) may include certain conditions in the PEI settings as shown in [Table 6].

[0172]

[0173] According to one embodiment, the condition may indicate that the PEI config is valid only when the terminal (5-1) is not performing LP-WUS monitoring, as shown in [Table 7].

[0174]

[0175] According to one embodiment, the condition may indicate that the PEI config is valid only when the terminal (5-1) is not operating in (Deep) sleep mode.

[0176] According to one embodiment, the condition may indicate that the PEI config is valid only when the terminal (5-1) is not operating in Serving Cell Offloading.

[0177] According to one embodiment, the condition may indicate that the PEI config is valid only when the terminal (5-1) has not received the LP-WUS within a certain timer. For example, the timer may be a timer based on the PEI resource. For example, the timer may be a timer based on the PO. For example, the timer may be included in the configuration information (e.g., the signal of step 5-7) that the base station (5-2) transmits to the terminal (5-1).

[0178] According to one embodiment, the specifications may specify that the terminal (5-1) performs this operation in the operation procedure. For example, as shown in [Table 8] below, it may be specified that the terminal (5-1) monitors PEI only when it is not performing LP-WUS monitoring.

[0179]

[0180] According to one embodiment, the condition may be indicated so that PEI is monitored only when the terminal (5-1) is not operating in (Deep) sleep mode.

[0181] According to one embodiment, the condition may be indicated so that PEI is monitored only when the terminal (5-1) is not operating in Serving Cell Offloading.

[0182] According to one embodiment, the condition may be such that the terminal (5-1) monitors the PEI only when it has not received the LP-WUS within a certain timer. The timer may be a timer based on the PEI resource. The timer may be a timer based on the PO. The timer may be included in any configuration information (e.g., the signal of step 5-7) that the base station (5-2) transmits to the terminal (5-1).

[0183] FIG. 6 illustrates an example in which a terminal according to an embodiment of the present disclosure receives PEI-related settings and conditions from a base station in connection mode and operates according to the conditions. (unicast signaling)

[0184] Referring to FIG. 6, the terminal (6-1) and the serving cell base station (6-2) may each include a Main Radio (MR) (6-3, 6-5) which can be represented by 5G NR and a low-power radio, LP-WUR (6-4, 6-6).

[0185] According to one embodiment, the base station (6-2) may transmit a signal containing setting information for controlling PEI operation according to the condition of the terminal (6-1) in connection mode (6-7) (step 6-8). For example, the base station (6-2) may transmit setting information associated with the PEI operation of the terminal (6-1) to the terminal (6-1).

[0186] According to one embodiment, the signal of step 6-8 may be transmitted by being included in a unicast signal (e.g., RRC Release, RRC Reconfig, etc., RRC signal, MAC signal, or PHY signal) transmitted by the base station (6-2) to the terminal (6-1). The unicast signal may be referred to as a signal transmitted by the base station (6-2) to the terminal (6-1).

[0187] As another example, the signal in steps 6-8 may be included in a broadcast signal (e.g., a master information block (MIB) included in an SSB, or any system information block (SIB)).

[0188] The signal in step 6-8 may include a condition for the terminal (6-1) to ignore PEI, which may include one of the various conditions described above in FIGS. 4 and FIGS. 5.

[0189] Additionally, the signal in step 6-8 may contain information about an area (e.g., tracking area) where the terminal (6-1) can ignore the PEI (or information about cells) (e.g., [Table 9]).

[0190] For example, the signal in steps 6-8 may contain information about cells that can ignore PEI in a format including all or part of a list of frequencies and cell IDs. Of course, the list may contain only one cell ID.

[0191]

[0192] For example, the signal in steps 6-8 may contain a list of tracking areas that can ignore PEI in the form of a list of tracking area IDs. Of course, the list may contain only one tracking area ID.

[0193] According to one embodiment, the signal of step 6-8 may include a timer in the form of a certain time length during which PEI can be ignored. The terminal (6-1) may not receive PEI when a specific condition is satisfied (e.g., when LP-WUS reception is possible) during the period in which the timer is valid.

[0194] According to one embodiment, the terminal (6-1) may be configured to always ignore PEI when certain conditions are satisfied. For example, the terminal (6-1) may not receive PEI when LP-WUS reception is possible.

[0195] Afterwards, the terminal (6-1) operating in Idle / Inactive mode (step 6-9) may start LP-WUS monitoring (step 6-11) or operate (or switch) the MR (6-3) to a designated sleep mode (step 6-10) when any condition set by the base station is satisfied.

[0196] According to one embodiment, a terminal (6-1) that simultaneously supports LP-WUS and PEI receives both LP-WUS settings and PEI settings (or both simultaneously), and terminals that support PEI can receive LP-WUS when they are performing LP-WUS monitoring (step 6-11), receive LP-WUS (step 6-12), wake MR (6-3) from sleep mode (step 6-13), and then perform an operation to receive paging.

[0197] According to one embodiment, a terminal (6-1) that does not need to perform PEI reception according to any rule defined in the standard or pre-set can receive the paging signal transmitted at the earliest time by ignoring PEI (steps 6-14, 6-15).

[0198] FIG. 7 illustrates an example in which a terminal according to an embodiment of the present disclosure receives PEI-related settings and conditions from a base station in connection mode and operates according to the conditions. (internode signaling for unicast signaling)

[0199] Referring to FIG. 7, the terminal (7-1), the serving cell base station (7-2) (e.g., the first base station), and the adjacent base station (7-3) (e.g., the second base station) may each include a Main Radio (MR) (7-4, 7-6, 7-8) which can be represented as 5G NR, and a Low Power Radio, LP-WUR (7-5, 7-7, 7-9). The base station (7-2) may transmit a signal containing configuration information for controlling PEI operation according to conditions to the terminal (7-10) in connection mode (step 7-11).

[0200] The signal of step 7-11 may be transmitted by being included in a Unicast signal (e.g., RRC Release, RRC Reconfig, etc., RRC signal, MAC signal, or PHY signal) that the first base station (7-2) transmits to the terminal (7-1). As another example, the signal of step 7-11 may be included in a broadcast signal (e.g., a master information block (MIB) included in an SSB, or any system information block (SIB)).

[0201] The signal in step 7-11 may include a condition for the terminal (7-1) to ignore PEI, which may include at least one of the various conditions mentioned in FIGS. 4 and FIGS. 5.

[0202] The signal in step 7-11 may contain information about an area (e.g., tracking area) where the terminal (7-1) mentioned in FIG. 6 can ignore the PEI.

[0203] For example, the signal in steps 7-11 may contain information about cells that can ignore PEI in a format including all or part of a list of frequencies and cell IDs. For example, the list may contain only one cell ID.

[0204] For example, the signal in steps 7-11 may contain a list of tracking areas that can ignore PEI in the form of a list of tracking area IDs. For example, the list may contain only one tracking area ID.

[0205] According to one embodiment, the signal of step 7-11 may include a timer in the form of a certain time length during which PEI can be ignored. The terminal (7-1) may not receive PEI when a specific condition is satisfied (e.g., when LP-WUS reception is possible) during the period in which the timer is valid.

[0206] According to one embodiment, the terminal (7-1) may be configured to always ignore PEI when certain conditions are satisfied. For example, it may not receive PEI when LP-WUS reception is possible.

[0207] According to one embodiment, a serving cell base station (7-2) (e.g., a first base station) responsible for the connection mode of a terminal (7-1) may transmit a signal to the terminal (7-1) and notify the second base station (7-3), which manages cells capable of ignoring the PEI set for the terminal (7-1) among adjacent base stations, via a node-to-node interface (e.g., F1 interface, etc.) that the terminal (7-1) has been set to ignore the PEI. For example, the first base station (7-2) may transmit the signal of step 7-11 to the second base station (7-3) among adjacent base stations and transmit information indicating that the terminal (7-1) has been set to ignore the PEI under specific conditions. In this case, the second base station (7-3) may be a base station associated with (or managing) the cells included in the 7-11 signal (e.g., cells that can ignore PEI).

[0208] Afterwards, the terminal (7-13) operating in Idle / Inactive mode may start LP-WUS monitoring (step 7-15) or operate MR in any sleep mode when any condition set by the base station is satisfied (step 7-14).

[0209] According to one embodiment, a terminal (7-1) that simultaneously supports LP-WUS and PEI receives both LP-WUS settings and PEI settings (or both simultaneously), and when terminals that support PEI are performing LP-WUS monitoring (step 7-15), they receive LP-WUS from an adjacent base station (7-3) (step 7-16), wake up MR from sleep mode (step 7-17), and then perform an operation to receive paging.

[0210] According to one embodiment, a terminal (7-1) that does not need to perform PEI reception according to any rule defined in the standard or pre-set can receive the paging signal transmitted at the earliest time by ignoring PEI (step 7-19, step 7-18).

[0211] FIG. 8 is a drawing illustrating the structure of a base station according to one embodiment of the present disclosure.

[0212] Referring to FIG. 8, the base station may include a transceiver, a control unit, and / or a storage unit. The transceiver, control unit, and storage unit may operate according to the communication method of the base station described above. Additionally, a network device may also correspond to the structure of the base station. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. For example, the base station may include a transceiver and a control unit. Furthermore, the transceiver, control unit, and storage unit may be implemented in the form of a single chip.

[0213] The base station of FIG. 8 can correspond to the base stations of FIG. 1 to 7 (e.g., 7-2, 7-3).

[0214] According to one embodiment, a transceiver collectively refers to the receiver and the transmitter of a base station and can transmit and receive signals with a terminal, another base station, or another network device. At this time, the signals transmitted and received may include control information and data. For example, the transceiver can transmit system information to a terminal and can transmit a synchronization signal or a reference signal. To this end, the transceiver may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver. The transceiver may include a wired / wireless transceiver and may include various configurations for transmitting and receiving signals. Additionally, the transceiver may receive a signal through a communication channel (e.g., a wireless channel), output it to a control unit, and transmit the signal output from the control unit through the communication channel. In addition, the transceiver receives a communication signal and outputs it to a processor, and can transmit the signal output from the processor to a terminal, another base station, or another entity via a wired or wireless network.

[0215] The storage unit can store programs and data necessary for the operation of the base station. Additionally, the storage unit can store control information or data included in signals acquired from the base station. The storage unit may be composed of a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the storage unit can store at least one of information transmitted and received through the transceiver and information generated through the control unit.

[0216] In the present disclosure, the control unit may be defined as a circuit or an application-specific integrated circuit or at least one processor. The processor may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications. The control unit may control the overall operation of a base station according to an embodiment proposed in the present disclosure. For example, the control unit may control the signal flow between each block to perform operations according to the flowchart described above.

[0217] FIG. 9 is a drawing illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0218] Referring to FIG. 9, the terminal may include a transceiver, a control unit, and / or a storage unit. The transceiver, control unit, and storage unit may operate according to the communication method of the terminal described above. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more components or fewer components than the components described above. For example, the terminal may include a transceiver and a control unit. In addition, the transceiver, control unit, and storage unit may be implemented in the form of a single chip.

[0219] The terminal of FIG. 9 may correspond to the terminals of FIG. 1 to 7 (e.g., 6-1, 7-1).

[0220] According to one embodiment, the transceiver unit collectively refers to the receiver unit and the transmitter unit of a terminal and can transmit and receive signals with a base station, another terminal, or a network entity. The signals transmitted and received with the base station may include control information and data. For example, the transceiver unit may receive system information from the base station and may receive a synchronization signal or a reference signal. To this end, the transceiver unit may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver unit, and the components of the transceiver unit are not limited to an RF transmitter and an RF receiver. Furthermore, the transceiver unit may include a wired / wireless transceiver unit and may include various configurations for transmitting and receiving signals. Additionally, the transceiver unit may receive a signal via a wireless channel and output it to a control unit, and transmit the signal output from the control unit via a wireless channel. In addition, the transceiver receives a communication signal and outputs it to a processor, and can transmit the signal output from the processor to a network entity through a wired or wireless network.

[0221] The storage unit can store programs and data necessary for the operation of the terminal. Additionally, the memory can store control information or data included in signals obtained from the terminal. The storage unit may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media.

[0222] In the present disclosure, the control unit may be defined as a circuit or an application-specific integrated circuit or at least one processor. The processor may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The control unit may control the overall operation of the terminal according to the embodiments proposed in the present disclosure. For example, the control unit may control the signal flow between each block to perform operations according to the flowchart described above.

[0223] Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0224] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present invention.

[0225] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0226] In addition, the above program may be stored on an attachable storage device that can be accessed via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present invention through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present invention.

[0227] In the specific embodiments of the present disclosure described above, the components included in the invention are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present invention is not limited to singular or plural components; even components expressed in the plural may be composed in a singular form, and components expressed in the singular form may be composed in a plural form.

[0228] Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, it is understood that various modifications are possible within the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. In a method performed by UE (user equipment), A step of receiving from a base station first information regarding the setting of a PEI (paging early indication) and second information instructing not to perform monitoring of the PEI when a specified condition is satisfied; A step of receiving an LP (low power)-WUS (wake-up signal) from the base station; If the above specified condition is not satisfied, the step of receiving the PEI for the PO (paging occasion) based on the first information via the UE's MR (main radio) from the base station; and A method comprising the step of receiving a paging message within the PO without monitoring the PEI based on the second information via the MR from the base station when the above specified condition is satisfied.

2. In Claim 1, A method comprising at least one of the conditions specified above, wherein the conditions include a condition in which monitoring of the LP-WUS begins, a condition in which a serving cell measurement associated with the base station is offloaded, a condition in which the LP-WUS is received during the operation of a timer, or a condition in which the measured value of a reference signal received through the LPR (low power radio) of the UE is greater than or equal to a threshold value.

3. In Claim 2, A method in which at least one of the information about the timer or the information about the threshold value is received from the base station via a master information block (MIB), a system information block (SIB), or a radio resource control (RRC) message.

4. In Claim 1, A method in which, when the LP-WUS is received from the base station through the LPR (low power radio) of the UE, the UE performs transmission and reception of data through the MR.

5. In Claim 1, The method further includes the step of receiving third information regarding the configuration of the LP-WUS from the base station, A method in which the first information, the second information, and the third information are received from the base station via a MIB (master information block), SIB (system information block), or RRC (radio resource control) message.

6. In Claim 1, A method in which, if the above specified condition is satisfied, the PEI is ignored based on the above second information.

7. In Claim 1, The method further includes the step of receiving information from the base station instructing not to perform the monitoring of the PEI regardless of the specified conditions, and A method in which monitoring of the PEI is not performed regardless of the specified conditions after the above information is received.

8. Regarding UE (user equipment), At least one transceiver; At least one processor communicatively coupled to the above at least one transceiver; and It includes at least one memory that is communicationally coupled to the above at least one processor and stores instructions, and The above instructions are executed individually or in any combination by the above at least one processor, so that the UE: Receive from a base station first information regarding the setting of a PEI (paging early indication) and second information instructing not to perform monitoring of the PEI when specified conditions are satisfied, Receives an LP (low power)-WUS (wake-up signal) from the above base station, and If the above specified condition is not satisfied, the PEI for the PO (paging occasion) is received from the base station via the UE's MR (main radio) based on the first information, and A UE that, when the above specified conditions are satisfied, receives a paging message within the PO without monitoring the PEI based on the second information via the MR from the base station.

9. In Claim 8, A UE, wherein the specified conditions include at least one of the following: a condition in which monitoring of the LP-WUS begins; a condition in which a serving cell measurement associated with the base station is offloaded; a condition in which the LP-WUS is received during the operation of a timer; or a condition in which the measured value of a reference signal received through the UE's LPR (low power radio) is greater than or equal to a threshold value.

10. In Claim 9, A UE, wherein at least one of the information regarding the timer or the information regarding the threshold value is received from the base station via a master information block (MIB), system information block (SIB), or radio resource control (RRC) message.

11. In Claim 8, When the LP-WUS is received from the base station through the LPR (low power radio) of the UE, the UE performs transmission and reception of data through the MR.

12. In claim 8, The above commands are the above UE: To receive third information regarding the configuration of the LP-WUS from the base station, and The above first information, the above second information, and the above third information are received from the base station via a MIB (master information block), SIB (system information block), or RRC (radio resource control) message, in a UE.

13. In claim 8, If the above specified conditions are satisfied, the PEI is ignored based on the above second information, UE.

14. In Claim 8, The above commands are the above UE: To receive information from the above base station instructing not to perform the monitoring of the PEI regardless of the above specified conditions, and A UE in which the monitoring of the PEI is not performed regardless of the specified conditions after the above information is received.

15. One or more computer-readable non-transitory storage media storing computer-executable instructions, wherein when the computer-executable instructions are executed individually or collectively by at least one processor of a User Equipment (UE), the UE: Receive from a base station first information regarding the setting of a PEI (paging early indication) and second information instructing not to perform monitoring of the PEI when specified conditions are satisfied, Receives an LP (low power)-WUS (wake-up signal) from the above base station, and If the above specified condition is not satisfied, the PEI for the PO (paging occasion) is received from the base station via the UE's MR (main radio) based on the first information, and A recording medium that, when the above specified conditions are satisfied, performs operations to receive a paging message within the PO without monitoring the PEI through the MR from the base station based on the second information.

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