Method and apparatus for performing cell reselection for supporting wakeup of radio cell in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system comprises: a step of receiving WUS resource configuration information for wakeup signaling (WUS) from a base station; a step in which the terminal in an idle or inactive state transmits a WUS to the base station on the basis of the WUS resource configuration information; and a step of receiving a signal for cell reselection from the base station.

Description

TECHNICAL FIELD

[0001] The disclosure relates to operations of a terminal and a base station in a wireless communication system. More specifically, when a transceiver of a base station or a cell in a network energy saving (NES) system supporting an energy saving technology enters a sleep mode, the disclosure relates to a cell reselection procedure of a terminal for reselecting a base station or a cell in a sleep mode, and a method and apparatus for transmitting and receiving a signal. BACKGROUND

[0002] The fifth generation (5G) mobile communication technology defines a wide frequency band, enabling high transmission rates and new services, not only in the "sub-6 GHz" band of 3.5 GHz or lower, but also in the "above 6 GHz" band including 28 GHz and 39 GHz, which is referred to as millimeter wave (mmWave). Also, to implement a transmission rate 50 times faster than that of 5G mobile communication technology and an ultra-low latency of 1 / 10, there is an ongoing consideration for the sixth generation (6G) mobile communication technology, referred to as a hyper-5G system, in a terahertz band (for example, 95 GHz to 3 THz bands).

[0003] At the early stage of 5G mobile communication technology development, to support enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC) related services and meet performance requirements, standardization efforts have been made for technologies such as beamforming and massive multiple input multiple output (MIMO) to mitigate radio wave path loss and increase radio wave transmission distance in mmWave, support for numerologies (for example, operating multiple subcarrier spacings) for efficient utilization of mmWave resources and time slot format dynamic operation, initial access techniques for supporting multi-beam transmission and wideband, definition and operation of bandwidth parts (BWPs), new channel coding and modulation methods such as low-density parity-check (LDPC) for large amounts of data transmission and polar codes for highly reliable transmission of control information, L2 pre-processing, and network slicing technology for providing a network dedicated to a specific service.

[0004] Currently, in consideration of services to be supported by 5G mobile communication technology, discussions are underway for improvement and performance enhancement of initial 5G mobile communication technology, and physical layer standardization efforts are also being made for technologies such as vehicle-to-everything (V2X) technology for assisting autonomous driving vehicles in making driving decisions based on information about the position and status of the vehicles and improving user convenience, new radio unlicensed band (NR-U) technology for system operation to meet various regulatory requirements in an unlicensed band, NR UE power saving technology, UE-satellite direct communication technology (non-terrestrial network (NTN)) for providing coverage to areas where terrestrial networks cannot communicate, and positioning technology.

[0005] In addition, in terms of air interface architecture / protocol, standardization efforts for technologies such as industrial Internet of Things (IIoT) supporting new services through interworking with other industries, integrated access and backhaul (IAB) technology for providing nodes for network service area expansion through integration of a wireless backhaul link and an access link, mobility enhancement including conditional handover and dual active protocol stack (DAPS) handover, and two-step random access (i.e., 1b random access channel (RACH) of NR) for simplifying random access procedures are ongoing. In terms of system architecture / service, standardization efforts for a 5G reference architecture (e.g., service based architecture or service based interface) in conjunction with network function virtualization (NFV) and software defined networking (SDN) technologies and mobile edge computing (MEC) for providing services based on UE location are also ongoing.

[0006] With the commercialization of 5G mobile communication systems, an exponentially increasing number of interconnected devices will access communication networks, and it is expected that enhanced functionality and performance of 5G mobile communication systems and integrated operation of interconnected devices will be necessary. To this end, new research in the following relevant fields has been scheduled: extended reality (XR) technology for efficient support of augmented reality (AR), virtual reality (VR), and mixed reality (MR); utilization of artificial intelligence (AI) and machine learning (ML) to achieve 5G performance improvement and complexity reduction; AI service support; metaverse service support; and drone communication.

[0007] In addition, this development of 5G mobile communication systems will lay the groundwork not only for the development of technologies for providing coverage in terahertz bands for 6G mobile communication technologies, but also for the development of technologies such as multi-antenna transmission technologies like full dimensional MIMO (FD-MIMO), array antennas, and massive antennas; lenses and antennas based on metamaterials for improving coverage of terahertz-band signals; high-dimensional spatial multiplexing technology using orbital angular momentum (OAM) and reconfigurable intelligent surface (RIS) technology, and full-duplex technology for improving frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication techniques that utilize satellites and AI for system optimization from the design stage and incorporate end-to-end AI support functions, and next-generation distributed computing techniques that utilize super-high-performance communication and computing resources to implement complex services beyond the limits of UE operation capabilities.

[0008] Meanwhile, a mobility support method and device using location information of a terminal in a non-terrestrial network system have been proposed, and in the case of a terminal that can use the method, a mobility support method using relative position measurement between the terminal and the network is required (different from the existing method based on signal strength). SUMMARY

[0009]

TECHNICAL PROBLEM

[0010] This disclosure aims to provide a method and apparatus for enhancing the handover performance of terminals in a wireless communication system by utilizing network power-saving mode operation information.

[0011] This disclosure aims to provide a method and apparatus for transmitting wake-up signaling (WUS) for cell reselection of a terminal in a wireless communication system.

[0012] This disclosure aims to provide a method and apparatus for cell reselection based on low-power synchronization signal blocks (LP-SSB) and general synchronization signal blocks (SSB).

[0013] The technical problems to be solved by the embodiments of this disclosure are not limited to those described above. Those skilled in the art to which this disclosure pertains can clearly understand other unmentioned technical problems through the following description.

[0014] [Technical Solution]

[0015] According to embodiments of this disclosure, a method performed by a terminal in a wireless communication system is proposed. Specifically, the method includes: receiving WUS resource configuration information for wake-up signaling (WUS) from a base station; transmitting WUS from the terminal, which is in an idle or inactive state, to the base station based on the WUS resource configuration information; and receiving a signal for cell reselection from the base station.

[0016] According to another embodiment of this disclosure, a method performed by a terminal in a wireless communication system is proposed. Specifically, the method includes: receiving a low-power synchronization signal block (LP-SSB) from a first base station; receiving an SSB from a second base station; and performing cell reselection based on the LP-SSB received from the first base station and the SSB received from the second base station.

[0017] According to another embodiment of this disclosure, a method performed by a base station in a wireless communication system is proposed. Specifically, the method includes: sending WUS resource configuration information for wake-up signaling (WUS) to a terminal; obtaining WUS sent by a terminal in an idle or inactive state based on the WUS resource configuration information; and sending a signal for cell reselection to the terminal.

[0018] According to another embodiment of this disclosure, a terminal in a wireless communication system is proposed. Specifically, the terminal includes: a transceiver configured to transmit and receive signals; and a controller configured to receive WUS resource configuration information for wake-up signaling (WUS) from a base station, transmit WUS from the terminal in an idle or inactive state to the base station based on the WUS resource configuration information, and receive signals for cell reselection from the base station.

[0019] According to another embodiment of this disclosure, a terminal in a wireless communication system is proposed. Specifically, the terminal includes: a transceiver configured to transmit and receive signals; and a controller configured to receive low-power synchronization signal blocks (LP-SSBs) from a first base station, receive SSBs from a second base station, and perform cell reselection based on the LP-SSBs received from the first base station and the SSBs received from the second base station.

[0020] According to another embodiment of this disclosure, a base station in a wireless communication system is proposed. Specifically, the base station includes: a transceiver configured to transmit and receive signals; and a controller configured to send WUS resource configuration information for wake-up signaling (WUS) to a terminal, acquire WUS from a terminal in an idle or inactive state based on the WUS resource configuration information, and send a signal for cell reselection to the terminal.

[0021] According to embodiments of this disclosure, a method for a terminal to perform conditional handover using network power-saving mode operation information may include: an operation by a first base station configuring handover conditions for the terminal based on the power-saving mode operation of neighboring base stations, including itself; an operation by the terminal determining power-saving mode status information of neighboring base stations, including the first base station; and an operation by the terminal handing over to the neighboring base station when the conditions of a specific event (e.g., an event by which the terminal determines which neighboring base station to handover to) are met.

[0022] [Beneficial Effects]

[0023] According to embodiments of this disclosure, terminal switching can be performed more quickly by effectively utilizing the power-saving mode operation information of the network in the wireless communication system.

[0024] The effects that can be obtained from this disclosure are not limited to those described above, and those skilled in the art can clearly understand other effects not mentioned through the following description. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a new air interface (NR) system according to an embodiment of the present disclosure.

[0026] Figure 2 This is a conceptual schematic diagram of the Network Energy Saving (NES) mode of a base station or cell according to an embodiment of this disclosure.

[0027] Figure 3 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to an embodiment of this disclosure.

[0028] Figure 4 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to another embodiment of this disclosure.

[0029] Figure 5 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to yet another embodiment of this disclosure.

[0030] Figure 6 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to another embodiment of the present disclosure.

[0031] Figure 7 This is a schematic diagram illustrating the process of a UE receiving different Synchronization System Blocks (SSBs) and selecting a cell in an environment where deep sleep cells and wake-up cells (MR enabled) coexist, according to an embodiment of this disclosure (cell selection using different SSBs).

[0032] Figure 8 This is a schematic diagram of an improved radio resource management (RRM) measurement model applicable to various offsets according to embodiments of the present disclosure.

[0033] Figure 9 This is a schematic diagram of the process of a UE performing cell reselection according to an embodiment of this disclosure.

[0034] Figure 10 This is a schematic diagram of the process of a UE reporting UE capability information according to an embodiment of this disclosure.

[0035] Figure 11 This is a schematic diagram of the structure of a base station according to an embodiment of the present disclosure.

[0036] Figure 12 This is a schematic diagram of the structure of a UE according to an embodiment of the present disclosure. Detailed Implementation

[0037] The working principle of this disclosure will now be explained in detail with reference to the accompanying drawings. In the following description of this disclosure, detailed descriptions of relevant known functions or configurations will be omitted if it is deemed unnecessary to obscure the main points of this disclosure. Furthermore, the terms described below are defined in consideration of their function in this disclosure and may vary depending on the intent or habit of the user or operator. Therefore, these terms should be defined based on the entirety of this specification.

[0038] The terms used in the following description, such as those for identifying access nodes, referring to network entities, referring to messages, referring to interfaces between network entities, and referring to various types of identification information, are provided for ease of explanation. Therefore, this disclosure is not limited to the terms described below, and other terms with equivalent technical meanings may be used.

[0039] Hereinafter, a base station is an entity that allocates resources to a terminal and may include at least one of gNode B, eNode B, Node B, base station (BS), radio access unit, BS controller, and nodes on a network. A terminal may include user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. In this disclosure, downlink (DL) refers to the radio link through which the base station transmits signals to the terminal, and uplink (UL) refers to the radio link through which the terminal transmits signals to the base station. Furthermore, while the following description may use LTE or LTE-A systems as examples, embodiments of this disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. For example, fifth-generation mobile communication technology (5G, New Radio, NR) developed after LTE-A may be included in systems to which embodiments of this disclosure are applicable, and 5G may cover existing LTE, LTE-A, and other similar services. Moreover, those skilled in the art can apply this disclosure to other communication systems with appropriate modifications without significantly departing from the scope of this disclosure. In this case, it should be understood that each block in the flowchart and combinations of blocks in the flowchart may be implemented by computer program instructions.

[0040] These computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute on the processor of the computer or other programmable data processing apparatus, generate means for implementing the functions specified in the flowchart block. These computer program instructions may also be stored in a computer-usable or computer-readable storage medium that directs the computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article of writing containing instruction means for implementing the functions specified in the flowchart block. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in the flowchart block.

[0041] Furthermore, each block in the flowchart may represent a module, segment, or code section containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in a block may not occur in the order shown. For example, two blocks shown consecutively may actually execute substantially simultaneously, or these blocks may sometimes execute in reverse order, depending on the functions involved. 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), that performs a specific task. However, a "unit" is not limited to software or hardware. A "unit" may be configured to reside on addressable memory and configured to execute on one or more processors. Therefore, a "unit" may include, for example, software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided in components and "units" may be combined into fewer components and "units," or further separated into additional components and "units." Furthermore, the component and "unit" may be implemented as one or more central processing units (CPUs) in an operating device or a secure multimedia card. Similarly, in embodiments, a "unit" may include one or more processors.

[0042] For ease of explanation, this disclosure uses the terms and names defined in the 5GS and NR standards as defined by the 3GPP (3rd Generation Partnership Project). However, this disclosure is not limited to these terms and names and can be equally applied to wireless communication networks conforming to other standards. For example, this disclosure can be applied to 3GPP 5GS / NR (the fifth-generation mobile communication standard).

[0043] Cell selection / reselection based on NES-WUR

[0044] To evaluate neighboring cells outside the serving cell for cell reselection, the UE uses variable values ​​previously received from the serving cell to calculate Srxlev and Squal values ​​and determines whether they meet the cell selection criteria previously received from the serving cell.

[0045] When in an RRC idle or RRC inactive state, the UE can identify and select a suitable cell. Among these selected suitable cells, the UE can camp on the cell with the highest priority.

[0046] UEs camped on a cell need to periodically check for better cells based on cell reselection criteria. If a better cell is found, the UE can select that cell.

[0047] Cell selection procedure: The process of selecting a neighborhood can be one of the following two steps: a) Initial cell selection (when there is no prior information about the frequency or channel usage system) A. The UE scans all radio frequency (RF) channels within the available system frequency bands to find a suitable cell.

[0048] B. For each frequency, the UE only needs to find the strongest cell. An exception is when using shared spectrum channel access, in which case the UE can search for strong cells sequentially.

[0049] C. If a suitable neighborhood is found, select that neighborhood.

[0050] b) Cell selection using prior information

[0051] A. Frequency information that needs to be stored in advance. Optionally, it may also include information about cell parameters or about previously detected cells contained in previously received measurement control information elements.

[0052] B. If a suitable neighborhood is found, select that neighborhood.

[0053] C. If no suitable cell is found, initiate the cell selection process in a).

[0054] The cell selection process does not use the priority between frequencies provided by system information or dedicated signaling broadcast to the UE, or the priority between radio access technologies (RATs).

[0055] Cell selection condition S is satisfied when the following conditions are met: Srxlev > 0 and Squal > 0 in: Srxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset ) - P compensation – Qoffset NESWUR -Qoffset temp Squal = Q qualmeas - (Q qualmin + Q qualminoffset ) – Qoffset NESWUR - Qoffset temp in:

[0056] New offset value Qoffset NESWURIt can be an offset applicable to NESWUR operating cells that are running in deep sleep mode and sending LP-SSB.

[0057] New offset value Qoffset NESWUR It can be an offset for LP-SSBs that can be sent in any WUR.

[0058] The signaling notification value Q rxlevminoffset and Q qualminoffset This is applied only when the UE is normally camped in a VPLMN and when evaluating cell selection for a cell due to periodic searches for a higher priority PLMN (TS 23.122 [9]). During such periodic searches for a higher priority PLMN, the UE can use parameter values ​​stored from different cells of that higher priority PLMN to check the S criteria of the cell.

[0059] Cell reselection procedure: The cell reselection process is shown in Table 1 below: [Table 1]

[0060] The UE can perform cell reselection assessment only for frequencies that are included in the system information and for which priority has been assigned.

[0061] [Table 2]

[0062] The measurement rules for cell reselection are designed to ensure that the UE performs only the necessary measurements, as shown in Table 3 below: [Table 3]

[0063] If the serving cell is an NES-WUR cell and reselection is performed via WUR signal, the following parameters can be applied, and the process in this scenario is shown in Table 4 below: [Table 4]

[0064] To compare cell quality and select a better cell during cell selection and reselection, the UE can measure each cell and determine its ranking. - Variant B: Introduces NES-WUR cell or frequency-specific offset for cell ranking criterion R.

[0065] - Notification can be made via broadcast or dedicated signaling.

[0066] The cell ranking criteria Rs for the serving cell and the cell ranking criteria Rn for neighboring cells are defined as follows: R s = Q meas,s +Q hyst - Qoffset NESWUR - Qoffset temp R n = Q meas,n -Qoffset - Qoffset NESWUR - Qoffset temp in:

[0067] The UE sorts the cells that meet the cell selection criterion S.

[0068] As mentioned above, for the cell, Q meas,n and Q meas,s The value is calculated using the average RSRP value, and then the R value is calculated using that value. Cells are then ranked accordingly.

[0069] If not configured rangeToBestCell If so, the UE will proceed to the cell with the highest priority for reselection.

[0070] If configured rangeToBestCell Then the UE will reselect when the R value falls within the range. rangeToBestCell Cells within the range of (difference from the R value of the highest-ranked cell) that exceed a threshold (i.e. absThreshSS- BlocksConsolidation The maximum number of beams in a cell.

[0071] In all cases, the UE will only perform a cell reselection if the following conditions are met: - If, during a specific time period Treselection RAT Within the community, the new community is superior to the current community in terms of the aforementioned community re-selection criteria.

[0072] - If the UE has been camped in the current serving cell for at least one second.

[0073] If configured for a certain frequency rangeToBestCell But not configured absThreshSS- BlocksConsolidation If so, the UE assumes that there is a beam exceeding the threshold for each cell within that frequency band.

[0074] Figure 1 This is a schematic diagram of a new air interface (NR) system architecture according to an embodiment of the present disclosure.

[0075] refer toFigure 1 The radio access network of an NR system can consist of next-generation base stations (gNode B (gNB), Node B or base station) and a core network (CN). User equipment (UE) or terminals can access external networks through gNB and CN.

[0076] exist Figure 1 In NR systems, the gNB corresponds to the existing Node B in UMTS systems or the existing enhanced Node B (eNB) in LTE systems. The gNB connects to the UE via a radio channel and can perform more complex functions than the existing eNB. In NR systems, all user services, including real-time services such as Voice over IP (VoIP) via the Internet Protocol, are provided through a shared channel. Therefore, a device is needed to collect state information such as the UE's buffer state, available transmit power state, and channel state, and to perform scheduling; the gNB is responsible for this function. A gNB typically controls multiple cells. For example, to achieve a transmission rate of 100 Mbps, NR systems use Orthogonal Frequency Division Multiplexing (OFDM) as the radio access technology within a 20 MHz bandwidth. Furthermore, it applies Adaptive Modulation and Coding (AMC), a technique that determines the modulation scheme and channel coding rate based on the UE's channel state.

[0077] The NR CN performs functions such as mobility support, bearer establishment, and quality of service (QoS) settings. The CN is responsible for various control functions, including UE mobility management, and can connect to multiple base stations. Furthermore, next-generation mobile communication systems are interoperable with existing LTE systems, and the CN can connect to the Mobility Management Entity (MME) via a network interface. The MME can also connect to existing base stations, such as eNBs.

[0078] Figure 2 This is a conceptual schematic diagram of the Network Energy Saving (NES) mode of a base station or cell according to an embodiment of this disclosure.

[0079] refer to Figure 2 A base station supporting Wake-up Radio (WUR) functionality can be referred to as a WUR BS, and a terminal supporting WUR functionality can be referred to as a WUR UE. A WUR BS may include a main radio (MR) for wireless communication with a WUR UE and a WUR for performing wake-up operations, and a WUR UE may include an MR for wireless communication with a WUR BS and a WUR for performing wake-up operations. In this configuration, the MR of the WUR BS can wirelessly communicate with the MR of the WUR UE or other UEs, and the WUR of the WUR BS can wirelessly communicate with the WUR of the WUR UE.

[0080] According to embodiments of this disclosure, the WUR may be part of the MR, physically integrated but logically distinct modules, rather than two physically separate modules.

[0081] According to embodiments of this disclosure, a WUR can be physically and logically part of an MR.

[0082] WUR BS and WUR UE can have the following operating states: 1. Fully On: In this state, both MR and WUR are on.

[0083] 2. MR On: In this state, only MR is on, while WUR is off.

[0084] 3. Deep sleep state: In this state, only MR is turned off, while WUR is turned on.

[0085] 4. Fully Off State: In this state, both MR and WUR are off.

[0086] Figure 3 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to an embodiment of this disclosure.

[0087] Specifically, Figure 3 This illustrates the process by which a UE sends a WUS to a base station according to an embodiment of this disclosure, and the base station wakes up from sleep mode after receiving the WUS (WUS basis).

[0088] The UE may include a primary radio (MR) and a wake-up radio user equipment (WUR UE), and the base station as a gNB may include a primary radio (MR) and a wake-up radio base station (WUR BS).

[0089] refer to Figure 3 In step 310, the WUR UE 301 can send a wake-up signal (WUS) to the WUR BS (gNB) 302, which is in a deep sleep state, and the WUR BS 302 can receive the WUS. At this time, the WUS can be received through the WUR receiver of the WUR BS.

[0090] In step 320, gNB 302, which receives WUS, can be woken up from deep sleep and switched to MR on or fully on state.

[0091] According to embodiments of this disclosure, the WUR may be part of the MR, physically integrated but logically distinct modules, rather than two physically separate modules.

[0092] According to embodiments of this disclosure, a WUR can be physically and logically part of an MR.

[0093] Figure 4 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to another embodiment of this disclosure.

[0094] Specifically, Figure 4 This illustration shows the process by which a UE sends a WUS based on base station configuration information according to an embodiment of the present disclosure, and the process by which the base station wakes up from sleep mode after receiving the WUS (WUS information basis).

[0095] The UE may include a main radio (MR) and a wake-up radio user equipment (WUR UE), and the base station as a gNB may include a main radio (MR) and a wake-up radio base station (WUR BS).

[0096] refer to Figure 4 In step 410, gNB 402 may send a specific signal to UE 401 to configure UE 401 to transmit WUS. For example, the signal may refer to WUS information. Specifically, gNB 402 may send a signal to UE 401 containing all or part of the following WUS resource information.

[0097] - Resource information, such as the specific time / frequency on which WUS can be sent. ■ For example, resource information containing subframe / radio frame / slot time information with specific periodic repetition rules. ■ For example, resource information including the duration of WUS transmission in terms of absolute time, number of time slots, number of frames, etc. ■ For example, resource information including intervals up to the start time, expressed in terms of absolute time, number of time slots, number of frames, timers, etc., is used to indicate a specific start time available for transmission after a specific time period has elapsed since the signal was received.

[0098] ■ For example, resource information that includes a frequency band ID indicating a specific frequency band.

[0099] ■ For example, resource information including the ID of the resource block indicating a specific starting frequency, the bandwidth indicating the frequency bandwidth, and the number of frequency bandwidths per unit resource block.

[0100] ■ For example, resource information including the ID of the reference frequency indicating the starting frequency from a specific reference frequency, the bandwidth indicating the difference between the reference frequency and the starting frequency, and the number of frequency bandwidths per unit resource block, etc.

[0101] - You can specify the sequence ID or a list of sequence IDs for sequences that can be sent via WUS.

[0102] - Information IDs or a list of information IDs indicating the type of information that can be sent via WUS.

[0103] - Indicates the type of condition ID or list of condition IDs that allow sending WUS.

[0104] - Indicates that the UE can send a WUS indicator when the gNB is in deep sleep mode.

[0105] - The above information may be information from the gNB that sends the corresponding signal.

[0106] - The above information may be information about a neighboring gNB (or cell) adjacent to the gNB that sends the corresponding signal, and in this case, the information may include gNB ID, cell ID, a list of gNB IDs, or a list of cell IDs.

[0107] - The above information may be applied to one or more gNBs or cells and may include a list of gNB IDs or cell IDs that can use the corresponding WUS transmission information.

[0108] - The above information can be applied equally to all neighboring gNBs or cells (cell common information), and in this case, it may include an indicator (e.g., a 1-bit indicator) to notify the UE of relevant information.

[0109] - The above information may have a similar or identical structure and format to the Physical Random Access Channel (PRACH) configuration information.

[0110] This signal can be included in the broadcast signal sent by the gNB to the UE, such as the Master Information Block (MIB) or System Information Block (SIB) within the SSB.

[0111] Alternatively, the signal may be included in a unicast signal specifically sent by the gNB to the UE, such as a Radio Resource Control (RRC) signal, a Media Access Control (MAC) signal, or a Physical Layer (PHY) signal.

[0112] In step 420, WUR UE 401 may send WUS to WUR BS (gNB) 402 which is in deep sleep, and WUR BS may receive the WUS. The WUS may be received through the WUR receiver of WUR BS 402.

[0113] In step 430, the gNB 402 receiving WUS can be woken up from deep sleep and switched to MR on or fully on state.

[0114] According to embodiments of this disclosure, the WUR may be part of the MR, physically integrated but logically distinct modules, rather than two physically separate modules.

[0115] According to embodiments of this disclosure, a WUR can be physically and logically part of an MR.

[0116] In the above scenarios, the UE can be an idle UE in idle / inactive mode. Alternatively, the UE can be a UE connected to another gNB and in connected mode.

[0117] A UE in connected mode can receive WUS information via broadcast signals (e.g., MIB, SIB) or unicast signals (e.g., RRC signal, MAC-CE, PHY signal) from its connected gNB, and can use it to send WUS to any other neighboring gNB.

[0118] Figure 5 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to yet another embodiment of this disclosure.

[0119] Specifically, Figure 5 The present invention illustrates a process in which a base station configures a WUS to a UE, the UE sends a WUS to the base station, the base station receives the WUS, wakes up from sleep mode, and sends a synchronization signal block (SSB) to the UE (for waking up the cell to receive the WUS of the SSB).

[0120] The UE may include a primary radio (MR) and a wake-up radio user equipment (WUR UE), and the base station as a gNB may include a primary radio (MR) and a wake-up radio base station (WUR BS).

[0121] refer to Figure 5 In step 510, gNB 502 can configure WUS resource information for UE 501 for WUS transmission.

[0122] The WUS resource information can be sent to the MR by the gNB 502. In this case, the gNB can configure the WUS resource information for the UE when the MR is enabled, and can receive the WUS sent by the UE using the corresponding WUS resources when the MR is disabled. The WUS resource information can also be sent to the WUR by the gNB.

[0123] WUS resource information may include Figure 4 The WUS resource information described herein may be in whole or in part. The WUS resource information may be transmitted via unicast transmission, such as Radio Resource Control (RRC) messages or Media Access Control (MAC) messages. Alternatively, it may be transmitted via broadcast transmission, such as Master Information Block (MIB) or System Information Block (SIB).

[0124] WUS resource information may include indicators that indicate the conditions for WUS transmission, which enable the UE to send WUS when it wishes to receive information and signals such as synchronization signals, MIBs, or SIBs from the corresponding gNB.

[0125] In step 520, WUR UE 501 may send WUS to WUR BS (gNB) 502 which is in deep sleep, and WUR BS may receive the WUS. The WUS may be received through the WUR receiver of WUR BS 502.

[0126] In step 530, the gNB 502 receiving WUS can be woken up from deep sleep and switched to MR on or fully on state.

[0127] In step 540, the gNB, which has been awakened from deep sleep to MR-enabled state, can send an SSB via MR. According to embodiments of this disclosure, various signals for cell reselection can be used instead of the SSB. These signals for cell reselection may include System Information Blocks (SIBs) (e.g., SIB1).

[0128] A UE receiving an SSB can select the optimal gNB and / or cell and perform random access.

[0129] Afterward, the UE can connect to the selected cell and perform radio data communication according to the random access procedure.

[0130] According to embodiments of this disclosure, the WUR may be part of the MR, physically integrated but logically distinct modules, rather than two physically separate modules.

[0131] According to embodiments of this disclosure, a WUR can be physically and logically part of an MR.

[0132] Figure 6 This is a schematic diagram illustrating the process of a UE sending and receiving a wake-up signal (WUS) with a base station according to another embodiment of the present disclosure.

[0133] Specifically, Figure 6 The present invention illustrates a process in which a serving base station configures a WUS to a UE, the UE sends a WUS to a neighboring base station, and the neighboring base station receiving the WUS sends an SSB to the UE after waking up from sleep mode (for the WUS of the neighboring gNB).

[0134] The UE may include a primary radio (MR) and a wake-up radio user equipment (WUR UE), and the base station as a gNB may include a primary radio (MR) and a wake-up radio base station (WUR BS).

[0135] refer to Figure 6 In step 610, the serving gNB 602 can configure WUS resource information for WUS transmission for the UE 601.

[0136] WUS resource information can be sent to MR via service gNB 602. WUS resource information can also be sent to WUR via service gNB 602. WUS resource information may include the above. Figure 4 All or part of the WUS resource information described in the document.

[0137] WUS resource information can be sent via unicast transmission, such as Radio Resource Control (RRC) messages or Media Access Control (MAC) messages. Alternatively, it can be sent via broadcast transmission, such as Master Information Block (MIB) or System Information Block (SIB).

[0138] WUS resource information may include indicators that indicate the conditions for WUS transmission, which enable the UE to send WUS when it wishes to receive information and signals such as synchronization signals, MIBs, or SIBs from the corresponding gNB.

[0139] In step 620, the WUR UE can send a WUS to a neighboring WUR BS (gNB) 603 that is in deep sleep, and the neighboring WUR BS can receive the WUS. At this time, the WUS can be received through the WUR receiver of the WUR BS.

[0140] In step 630, the neighboring gNB 603 receiving WUS can be woken up from deep sleep and switched to MR on or fully on state.

[0141] In step 640, the gNB, which has been awakened from deep sleep to MR-enabled state, can send an SSB via MR. According to embodiments of this disclosure, various signals for cell reselection can be used instead of the SSB. These signals for cell reselection may include System Information Blocks (SIBs) (e.g., SIB1).

[0142] A UE receiving an SSB can select the optimal gNB and / or cell and perform random access.

[0143] Afterward, the UE can connect to the selected cell and perform radio data communication according to the random access procedure.

[0144] According to embodiments of this disclosure, the WUR may be part of the MR, physically integrated but logically distinct modules, rather than two physically separate modules.

[0145] According to embodiments of this disclosure, a WUR can be physically and logically part of an MR.

[0146] Figure 7 This is a schematic diagram illustrating the process of a UE receiving different Synchronization System Blocks (SSBs) and selecting a cell in an environment where deep sleep cells and wake-up cells (MR enabled) coexist, according to an embodiment of this disclosure (cell selection using different SSBs).

[0147] The UE may include a primary radio (MR) and a wake-up radio user equipment (WUR UE), and the base station as a gNB may include a primary radio (MR) and a wake-up radio base station (WUR BS).

[0148] refer to Figure 7 In step 710, UE 701 can receive different types of synchronization signals or reference signals from gNB1 702 in deep sleep mode and gNB2 703 in wake-up mode (or normal mode).

[0149] Here, the signal transmitted by gNB1 702 in deep sleep mode may be a low-power synchronization signal instead of a general synchronization signal, or a low-power synchronization system block (LP-SSB) including a Master Information Block (MIB) and / or a System Information Block (SIB). According to embodiments of this disclosure, a low-power signal for cell reselection may be used instead of the LP-SSB.

[0150] UE 701, which receives different types of synchronization signals (e.g., LP-SSB and SSB), can perform the following equivalent comparison procedure. According to embodiments of this disclosure, a low-power signal used for cell reselection can be used to replace LP-SSB, and a signal used for cell reselection can be used to replace SSB.

[0151] According to embodiments of this disclosure, UE 701 can compensate for and compare differences between different signals by adding or multiplying the received signal strength of a specific type of synchronization signal or reference signal (e.g., reference signal received power (RSRP), reference signal received quality (RSRQ), channel quality indicator (CQI), signal-to-noise ratio (SNR), signal-to-interference-plus-noise ratio (SINR), etc.) by an offset.

[0152] For example, the UE can multiply the RSRP value of the LP-SSB by a specific offset-1 value and use the Radio Resource Management (RRM) measurement model to calculate a representative value of the cell that transmits the LP-SSB.

[0153] Alternatively, for example, the UE can add a specific offset-2 value to the RSRQ value of the SSB and use the RRM measurement model to calculate a representative value of the cell that sent the SSB.

[0154] According to another embodiment of this disclosure, the UE can add or multiply an offset to a cell representative value calculated using an RRM measurement model based on a specific type of synchronization signal or reference signal transmitted by the cell, in order to compensate for and compare differences between different signals.

[0155] For example, the UE can multiply the RSRP value of the LP-SSB by a specific offset-1 value and use the RRM measurement model to calculate the representative value of the cell that transmits the LP-SSB.

[0156] Alternatively, for example, the UE can add a specific offset-2 value to the RSRQ value of the SSB and use the RRM measurement model to calculate a representative value of the cell that sent the SSB.

[0157] The aforementioned offset values ​​and various values ​​used in the RRM measurement model may be included in the Radio Resource Control (RRC), Media Access Control (MAC), or PHY signals transmitted by the gNB to the UE via unicast, or in the MIB or SIB transmitted via broadcast.

[0158] In step 730, UE 701, which compares different types of synchronization signals, selects (or reselects) the optimal gNB and / or cell to perform random access.

[0159] Figure 8 This is a schematic diagram of an improved radio resource management (RRM) measurement model applicable to various offsets according to embodiments of this disclosure. Figure 8 RRM measurement model).

[0160] refer to Figure 8 The base station can be configured with some or all of various offsets for various measurements, and the UE can derive representative values ​​of the cell based on this configuration.

[0161] exist Figure 8 In this context, offset 1 is the offset value that is directly multiplied or added to each measured value of a reference signal or synchronization signal (such as Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Channel Quality Indicator (CQI), Signal-to-Noise Ratio (SNR), or Signal-to-Interference Plus Noise Ratio (SINR)) measured by the UE before L1 filtering.

[0162] exist Figure 8 In this context, offset 2 is the offset value derived from the L1 filter of each reference signal or synchronization signal measurement (such as RSRP, RSRQ, CQI, SNR, or SINR) multiplied or added to the UE measurement.

[0163] exist Figure 8 In this context, offset 3 is the offset value of the cell representative value derived by beam combining and selection (e.g., taking the average of the measurements of N best beams from beams whose signal strength is greater than a specific threshold configured by the base station) after L1 filtering by multiplying or adding the measured values ​​of each reference signal or synchronization signal measured by the UE (e.g., RSRP, RSRQ, CQI, SNR, or SINR).

[0164] exist Figure 8 In this context, offset 4 is the offset value of the cell representative value after L3 filtering, derived by multiplying or adding to the measured values ​​of each reference signal or synchronization signal measured by the UE (e.g., RSRP, RSRQ, CQI, SNR, or SINR, etc.) after L1 filtering, through beam combining and selection (e.g., taking the average of the measured values ​​of N best beams from beams whose signal strength is greater than a specific threshold configured by the base station).

[0165] The aforementioned offset values ​​and various values ​​used in the RRM measurement model may be included in the Radio Resource Control (RRC), Media Access Control (MAC), or PHY signals sent by the base station to the UE via unicast, or in the Master Information Block (MIB) or System Information Block (SIB) sent via broadcast.

[0166] The offset value and its application within the RRM measurement model can be partially omitted. The offset value can be left unconfigured or configured as 1, thus not affecting the process by which the UE derives the cell representative value.

[0167] The above offset values ​​can be calculated using formulas that utilize all or part of the following components.

[0168] - Bandwidth, Tx power, frequency, and path loss of the signal (LP-SSB, SSB, LP-CSI-RS, CSI-RS, ...).

[0169] Figure 9 This is a schematic diagram of the process of a UE performing cell reselection according to an embodiment of this disclosure.

[0170] refer to Figure 9 When a UE performs cell selection (or reselection), the method for determining the frequency priority of a base station in deep sleep mode can be as follows (frequency priority processing when some gNBs are in deep sleep).

[0171] The UE may include a primary radio (MR) and a wake-up radio user equipment (WUR UE), and the base station as a gNB may include a primary radio (MR) and a wake-up radio base station (WUR BS).

[0172] In step 910, UE 901 can establish a Radio Resource Control (RRC) connection with gNB 902 and be in RRC connection mode (RRC_CONNECTED).

[0173] In step 920, gNB 902 may send an RRC release message (RRCRelease message) to UE 901.

[0174] UE 901 can configure frequency priorities via the RRRCRelease message to determine the frequency band priority used for cell reselection and which frequency band to prioritize during cell reselection. Subsequently, UE 901 can apply the configured frequency priorities to perform operations.

[0175] The message may contain a frequency-specific cell reselection priority value that supports NES-WUR and / or LP-SSB. Alternatively, the message may contain an indicator that supports the frequency-specific cell reselection priority value of NES-WUR and / or LP-SSB broadcast in the system information. The message may contain a t320 value or a new timer value associated with the indicator or priority value. The UE can start a timer using the appropriate value.

[0176] For reference, the frequency-specific cell reselection priority value supporting NES-WUR and / or LP-SSB can be notified via signaling as in the above-described cell reselection process embodiment, or it can be the final cell reselection priority value obtained by adding the offset value of the signaling notification of this disclosure to the cell reselection priority value derived in the above-described cell reselection process embodiment.

[0177] Subsequently, in step 930, UE 902 may disconnect from the serving cell or perform cell reselection after receiving the RRCLease message. For example, when receiving an RRCLease message containing suspendConfig information, the UE may switch to RRC Inactive (RRC_INACTIVE) mode; otherwise, the UE may switch to RRC Idle (RRC_IDLE) mode.

[0178] In step 940, UE 901, in RRC idle mode or RRC inactive mode, can receive necessary system information broadcast by the cell or gNB 902 via MR or WUR. In this disclosure, the Master Information Block (MIB) and System Information Block 1 (SIB1) may be referred to as necessary system information. The necessary system information (MIB or SIB1) may contain predetermined information applicable to UEs supporting WUR. This predetermined information may refer to at least one of the following: - An indicator for whether to send a low-power synchronization signal (LP-SSB) or configuration information for LP-SSB. - An indicator of whether to send a Low Power Wake-up Signal (WUS) or configuration information for WUS. - Q rxlevminWUR The minimum signal reception level required when a UE supporting WUR selects a cell supporting NES-WUR and / or LP-SSB. - Q qualminWURThe minimum signal quality level required when a UE supporting WUR selects a cell supporting NES-WUR and / or LP-SSB. - Q rxlevminoffsetWUR Minimum signal reception level offset required when a UE supporting WUR selects a cell supporting NES-WUR and / or LP-SSB. - Q qualminoffsetWUR Minimum signal quality level offset required when a UE supporting WUR selects a cell supporting NES-WUR and / or LP-SSB. In step 950, UE 901, which is in RRC idle mode or RRC inactive mode, can perform a cell selection procedure based on the system information received in the previous step.

[0179] The UE can search for suitable cells belonging to the selected PLMN or SNPN and camp on them. The definition of a suitable cell can follow the above embodiments. Since a UE supporting WUR can effectively save energy by selecting or reselecting cells supporting WUS and / or LP-SSB, the UE according to this disclosure can derive the cell selection received signal level value (Srxlev) and the cell selection signal quality value (Squal) by at least one of the methods proposed below (i.e., the following methods can be performed in combination or only one of them). If both Srxlev and Squal are greater than 0, the UE can determine that the cell selection criteria are met.

[0180] - Method 1: UEs supporting WUR derive Srxlev and Squal by applying the minimum signal received level and minimum quality level required when selecting a cell that supports NES-WUR and / or LP-SSB.

[0181] Srxlev = Q rxlevmeas - (Q rxlevminWUR + Q rxlevminoffset ) - P compensation - Qoffset temp , Squal = Q qualmeas - (Q qualminWUR + Q qualminoffset - Qoffset temp . For reference, in addition to applying Q rxlevminWUR and Q qualminWUR Apart from that, the rest can follow the above embodiments. Q rxlevminoffset P compensation Qoffset temp and Q qualminoffsetAt least one of the parameters in Srxlev and Squal may not be applied to the UE, and in this case, the UE may treat the corresponding value as 0. In other words, the UE may disregard the corresponding parameters in Srxlev and Squal.

[0182] - Method 2: UEs that support WUR derive Srxlev and Squal by applying the minimum signal received level offset and minimum quality level offset values ​​required when selecting a cell for the applicable NES-WUR and / or LP-SSB.

[0183] (Option 1)

[0184] Srxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffsetWUR + Q rxlevminoffset ) - P compensation - Qoffset temp

[0185] Squal = Q qualmeas - (Q qualmin + Q qualminoffsetWUR + Q qualminoffset - Qoffset temp

[0186] (Option 2)

[0187] Srxlev = Q rxlevmeas - (Q rxlevmin - Q rxlevminoffsetWUR + Q rxlevminoffset ) - P compensation - Qoffset temp

[0188] Squal = Q qualmeas - (Q qualmin - Q qualminoffsetWUR + Q qualminoffset - Qoffset temp

[0189] For reference, in addition to further applying Q rxlevminoffsetWUR and Q qualminoffsetWUR Apart from that, the rest can follow the above embodiments.

[0190] The difference between the two proposed options lies in the degree to which the UE relatively controls the selection of cells supporting NES-WUR and / or LP-SSB in a preferential manner. In other words, Option 1 may lead the UE to select fewer cells supporting NES-WUR and / or LP-SSB, while Option 2 may lead the UE to select more cells supporting NES-WUR and / or LP-SSB. Of course, according to Q... rxlevminoffsetWUR and Q qualminoffsetWUR The range of values ​​for trusted command notifications can be defined in one way, with options 1 and 2 representing the same approach.

[0191] Q rxlevminoffset Q rxlevminoffsetcell Q rxlevminoffsetcellSUL P compensation Qoffset temp and Q qualminoffset At least one of the parameters may not be applied to the UE, in which case the UE may treat the corresponding value as 0 (i.e., the corresponding parameters may be ignored for Srxlev and Squal).

[0192] Q rxlevminoffset Q rxlevminoffsetcell Q rxlevminoffsetcellSUL P compensation Qoffset temp and Q qualminoffset At least one of the parameters can be excluded from the UE's consideration; in this case, the UE can treat the corresponding value as 0. That is, the parameters for Srxlev and Squal can be disregarded.

[0193] - Method 3: UEs supporting WUR derive Srxlev and Squal by applying the minimum signal received level, its offset, minimum quality level, and its offset required when selecting a cell that supports NES-WUR and / or LP-SSB.

[0194] Srxlev = Q rxlevmeas - (Q rxlevminWUR + Q rxlevminoffsetWUR + Q rxlevminoffset -P compensation - Qoffset temp , Squal = Q qualmeas - (Q qualminWUR + Q qualminoffsetWUR + Q qualminoffset - Qoffset temp . For reference, in order to apply Q rxlevminoffsetWUR and Q qualminoffsetWUR Option 2 proposed in Method 2 can also be applied to Method 3.

[0195] - Method 4: UEs supporting WUR derive Srxlev and Squal by applying the minimum signal received level, its offset, minimum quality level, and its offset required when selecting a cell that supports NES-WUR and / or LP-SSB.

[0196] Srxlev = Q rxlevmeas - (Q rxlevminWUR + Q rxlevminoffset ) - P compensation - Qoffset NESWUR - Qoffset temp , Squal = Q qualmeas - (Q qualminWUR + Q qualminoffset - Qoffset NESWUR - Qoffset temp . - Method 5: UEs supporting WUR derive Srxlev and Squal by applying the minimum signal received level, its offset, minimum quality level, and its offset required when selecting a cell that supports NES-WUR and / or LP-SSB.

[0197] Srxlev = Q rxlevmeas - (Q rxlevminWUR + Q rxlevminoffsetWUR + Q rxlevminoffset -P compensation - Qoffset NESWUR - Qoffset temp , Squal = Q qualmeas - (Q qualminWUR + Q qualminoffsetWUR + Q qualminoffset - Qoffset NESWUR - Qoffset temp . For reference, in order to apply Q rxlevminoffsetWUR and Q qualminoffsetWUR Option 2 proposed in Method 2 can also be applied to Method 5.

[0198] In the above method, Q rxlevminoffset Q rxlevminoffsetWUR Q rxlevminoffsetcell Q rxlevminoffsetcellSUL P compensation Qoffset NESWUR Qoffset tempQ qualminWUR Q qualminoffsetWUR and Q qualminoffset At least one of the parameters can be excluded from the UE, and in this case, the UE can treat the corresponding value as 0. That is, the corresponding parameters can be ignored for Srxlev and Squal.

[0199] The UE can derive Srxlev and Squal to select a cell via MR (i.e., signals / messages sent by the base station via MR) or WUR (i.e., LP-SSB or WUS sent by the base station via WUR). Alternatively, the UE can determine whether the cell selection criteria are met via MR according to the above embodiments, and then further determine whether the cell selection criteria are met via WUR using the method proposed in this disclosure, thereby selecting a cell.

[0200] In step 960, in order to perform the cell reselection evaluation process, UE 901, which is in RRC idle mode or RRC inactive mode, can obtain system information (e.g., SIB2, SIB3, SIB4, SIB5, SIBx) containing cell reselection information from the serving cell.

[0201] In this disclosure, system information may include predefined information applicable to UEs that support WUR. This predefined information may refer to at least one of the following: - Supports frequency-specific cell reselection priority values ​​for NES-WUR and / or LP-SSB ■ This value can be notified via signaling as in the above embodiments, or it can be the final cell reselection priority value obtained by adding the offset value of the signaling notification of this disclosure to the cell reselection priority value derived in the above embodiments.

[0202] - Q rxlevminLP The minimum signal reception level required when a UE supporting WUR reselects a cell supporting NES-WUR and / or LP-SSB.

[0203] ■ This value can be signaled at each frequency.

[0204] - Q qualminLP The minimum signal quality level required when a UE supporting WUR reselects a cell supporting NES-WUR and / or LP-SSB.

[0205] ■ This value can be signaled at each frequency.

[0206] - Q rxlevminoffsetLP The minimum signal reception level offset required when a UE supporting WUR reselects a cell supporting NES-WUR and / or LP-SSB.

[0207] ■ This value can be notified via signaling for each cell within each frequency, and at this time, the signaling notification indicates the physical cell ID (PhyCellId) of that cell.

[0208] - Q qualminoffsetLP : Minimum signal quality level offset required when a UE supporting WUR reselects a cell supporting NES-WUR and / or LP-SSB

[0209] ■ This value can be notified via signaling for each cell within each frequency, and at this time, the signaling notification indicates the physical cell ID (PhyCellId) of that cell.

[0210] - List of cells allowed for UEs supporting NES-WUR and / or LP-SSB on each frequency

[0211] ■ The UE may consider only the cells included in the list as candidate cells for cell reselection.

[0212] - List of cells excluded for UEs supporting NES-WUR and / or LP-SSB on each frequency

[0213] ■ The UE may choose not to consider the cells included in this list as candidate cells for cell reselection.

[0214] - QoffsetWUR value of each neighboring cell supporting NES-WUR and / or LP-SSB within the frequency (same frequency) of the serving cell.

[0215] ■ The QoffsetWUR value is the offset between the serving cell and its neighboring cells in the same frequency band. This value is used to derive the rank (Equation 2) in the above embodiments and can be applied by at least one of the following methods.

[0216] Method 1: Rn = Qmeas,n - Qoffset - QoffsetWUR- Qoffsettemp Method 2: Rn = Qmeas,n - QoffsetWUR - Qoffsettemp - QoffsetWUR value of each neighboring cell supporting NES-WUR and / or LP-SSB on each frequency (different from the serving cell) ■ The QoffsetWUR value is the offset between the serving cell and its neighboring cells in NR inter-frequency bands. This value is used to derive the rank in the above embodiments and can be applied by at least one of the following methods.

[0217] Method 1: Rn = Qmeas,n - Qoffset - QoffsetWUR - Qoffsettemp, where if Qoffsets,n is valid, then Qoffset = Qoffset s,n + Qoffset frequency Otherwise, it equals Qoffset. frequency Method 2: Rn = Qmeas,n - Qoffset frequency - QoffsetWUR- Qoffsettemp Method 3: Rn = Rn = Qmeas,n - QoffsetWUR - Qoffsettemp In step 970, UE 901 in RRC idle mode or RRC inactive mode can execute a cell reselection evaluation procedure. This cell reselection evaluation procedure may refer to a series of processes that determine the reselection priority (reselection priority processing), perform frequency measurements based on the determined reselection priority by applying cell reselection measurement rules, and reselect a cell accordingly by evaluating cell reselection criteria.

[0218] According to this disclosure, UE 901 can determine cell reselection priority by at least one of the following methods. Specifically, the UE can perform a combination of the following methods or perform only one of them.

[0219] Method 1: If the received RRC connection release message contains a frequency-specific cell reselection priority value that supports NES-WUR and / or LP-SSB, the UE may apply that value to determine the cell reselection priority. If the UE is running a T320 timer or a new timer, the UE may continue the above operation until the timer expires or stops. That is, the UE may not apply the cell reselection priority value broadcast in the system information.

[0220] - Method 2: If the running T320 timer or a new timer expires or stops, or if the UE is not configured with a frequency-specific cell reselection priority value supporting NES-WUR and / or LP-SSB, the UE may apply the frequency-specific cell reselection priority value supporting NES-WUR and / or LP-SSB broadcast in the system information to determine the cell reselection priority. In this case, the UE may determine the cell reselection priority simply by applying the frequency-specific cell reselection priority value supporting NES-WUR and / or LP-SSB. Of course, if there is no cell reselection priority value for NES-WUR and / or LP-SSB per frequency, the UE may determine the cell reselection priority by applying the cell reselection priority value described in the above embodiments (i.e., if a cell reselection priority value for NES-WUR and / or LP-SSB exists for a specific frequency, the UE applies that value; otherwise, the UE applies the cell reselection priority value described in the foregoing embodiments).

[0221] Method 3: If an indicator for a frequency-specific cell reselection priority value supporting NES-WUR and / or LP-SSB is received in the system information, the UE can determine the cell reselection priority using the frequency-specific cell reselection priority value supporting NES-WUR and / or LP-SSB broadcast in the system information. In this case, the UE can determine the cell reselection priority simply by applying the frequency-specific cell reselection priority value supporting NES-WUR and / or LP-SSB. Of course, if the UE does not have a frequency-specific cell reselection priority value for NES-WUR and / or LP-SSB, the UE can determine the cell reselection priority by applying the cell reselection priority value described in the foregoing embodiments. That is, if a cell reselection priority value for NES-WUR and / or LP-SSB exists for a specific frequency, the UE can apply that value; otherwise, the UE can apply the cell reselection priority value described in the foregoing embodiments. For reference, the above operations can be performed when the T320 timer or a new timer is running. Of course, the above operations can also be performed independently of the timer.

[0222] The UE can perform frequency measurements for cell reselection. This can follow at least one of the embodiments described above.

[0223] The UE can determine which cells meet the cell reselection criteria based on measurements. This can be done following the embodiments described above. According to this disclosure, the UE can apply received system information and derive the signal received level (Srxlev) and signal quality (Squal) values ​​of neighboring cells using the methods proposed above. According to this disclosure, the UE can derive the cell-specific rank using the methods proposed in the above embodiments.

[0224] In step 980, before finally reselecting a candidate target cell, UE 901 receives system information (e.g., MIB or SIB1) broadcast by the candidate target cell, and determines, based on the received system information, whether the cell selection received signal level (Srxlev) and cell selection signal quality (Squal) of the candidate target cell are both greater than 0 (i.e., satisfying the cell selection criteria (Srxlev > 0 and Squal > 0)). If the cell selection criteria are met and the candidate target cell is suitable, the UE can reselect the candidate target cell.

[0225] When UE 901 performs cell selection (or reselection), the method for determining frequency priority can be as follows.

[0226] First, if UE 901 supports NES-WUR operation and / or is camped on a cell that can operate in NES-WUR, then UE 901 can treat the frequency of the serving cell as the highest priority frequency.

[0227] Alternatively, UE 901 may receive a list of frequencies that support NES-WUR from the base station. If a list of frequencies supporting NES-WUR is received, UE 901 may perform cell reselection on those frequencies. If UE 901 cannot find a suitable cell or a cell superior to the serving cell among the frequencies supporting NES-WUR, the UE may then attempt to find a suitable cell among the frequencies that do not support NES-WUR.

[0228] Alternatively, UE 901 can receive a list of frequencies that do not support NES-WUR from the base station. If a list of frequencies that do not support NES-WUR is received, the UE can perform cell reselection on frequencies that exclude these frequencies (i.e., frequencies that support NES-WUR). Subsequently, if UE 901 cannot find a suitable cell or a cell superior to the serving cell among the frequencies that support NES-WUR, the UE can then attempt to find a suitable cell among the frequencies that do not support NES-WUR.

[0229] The UE can receive a signal from the serving cell that contains a list of frequencies supporting NES-WUR. This signal can be an RRC signal (such as an RRC release signal), any MAC signal containing MAC-CE, or a PHY signal such as downlink control information (DCI).

[0230] The UE can receive a signal from the serving cell containing an indicator (e.g., a 1-bit indicator) that is used to prioritize cell reselection on frequencies supporting NES-WUR. This signal can be an RRC signal (e.g., an RRC release signal), any MAC signal containing MAC-CE, or a PHY signal such as DCI.

[0231] The parameters configured for the UE to perform cell selection (or reselection) are shown in Tables 5 to 7 below.

[0232] [Table 5]

[0233] [Table 6]

[0234] [Table 7]

[0235] - CellReselectionPriority

[0236] The IE CellReselectionPriority This relates to the absolute priority of the carrier frequencies used in the cell reselection procedure. It corresponds to the "priority" parameter in TS 38.304

[20] . A value of 0 indicates the lowest priority. If this field is not present (if applicable), the UE's behavior is specified in TS 38.304

[20] .

[0237] CellReselectionPriority Information elements

[0238] Tables 5 through 7 are examples of RRRCRelease messages, but embodiments of this disclosure are not limited thereto. For example, a list of frequencies that support NES-WUR, a list of frequencies that do not support NES-WUR, or an indicator that prioritizes cell reselection on frequencies that support NES-WUR can be received via any MAC signal containing MAC-CE or a PHY signal such as downlink control information (DCI).

[0239] ◇ Introduce a list of allowed and / or excluded NES-WUR cells by frequency.

[0240] - Used for reselecting cells that support NES-WUR.

[0241] - The UE reselects the best or highest-ranking cell from the list of allowed NES-WUR cells (or not from the list of excluded NES-WUR cells) on the relevant frequency.

[0242] - This can be achieved through broadcast signaling or dedicated signaling.

[0243] Figure 10 This is a schematic diagram of the process of a UE reporting UE capability information according to an embodiment of this disclosure.

[0244] Figure 10 This document illustrates the process by which a UE reports UE capability information to a base station in deep sleep mode during cell selection (or reselection) according to an embodiment of this disclosure (frequency priority processing when some gNBs are in deep sleep).

[0245] The UE may include a primary radio (MR) and a wake-up radio user equipment (WUR UE), and the base station as a gNB may include a primary radio (MR) and a wake-up radio base station (WUR BS).

[0246] refer to Figure 10 In step 1010, UE 1001 may send a UE capability information message to gNB 1002. This message may report that the UE has Network Energy Saving Wake-up Signaling (NES-WUR) support capability (introducing UEs that support NES-WUR) through indicators, etc.

[0247] According to embodiments of this disclosure, the UE capability information message may contain information or indicators about whether the UE supports Network Power-Saving Wake-up Radio (NES-WUR) and / or NES-WUR (adding the capability of the UE to support NES-WUR and / or NES-WUR).

[0248] According to another embodiment of this disclosure, the UE capability information message may include information or indicators about whether the UE is able to send WUS to the network and / or wake up a sleeping cell (adding the UE's capability to send WUS to the network and wake up a sleeping cell).

[0249] According to yet another embodiment of this disclosure, the UE capability information message may include information or indicators about whether the UE is able to camp on an NES-WUR cell that is in deep sleep mode (adding the UE's capability to camp on an NES-WUR cell that may be in deep sleep mode).

[0250] According to another embodiment of this disclosure, the UE capability information message may contain information or indicators regarding whether the UE is able to perform an improved cell reselection procedure based on its support for NES-WUR.

[0251] According to a further embodiment of this disclosure, the UE capability information message may include information or an indicator regarding whether the UE is capable of receiving low-power synchronization system blocks (LP-SSBs) for various purposes from an NES-WUR cell (adding the UE's capability to receive LP-SSBs for various purposes from an NES-WUR cell). Various purposes may include at least one of synchronization, radio resource management (RRM), camping, cell (re)selection, mobility (handover), beam management, and beam failure recovery.

[0252] The gNB 1002, which receives UE capability information, can perform the aforementioned series of procedures based on the UE capability information. For example, the gNB can send WUS information or configure WUS resource information for sending WUS based on the UE capability information. Alternatively, the gNB 1002 can send synchronization signals and / or reference signals.

[0253] Figure 11 This is a schematic diagram of the structure of a base station according to an embodiment of the present disclosure.

[0254] refer to Figure 11 The base station may include a transceiver 1110, a controller 1120, and a memory 1130. The transceiver 1110, controller 1120, and memory 1130 may operate according to the communication method of the base station described above. Network devices 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 those described above. For example, the base station may include a transceiver and a controller. Furthermore, the transceiver, controller, and memory may be implemented as a single chip.

[0255] Transceiver 1110 refers to both the receiver and transmitter of a base station, and can send signals to / receive signals from / to the UE, other base stations, or other network devices. The transmitted and received signals may include control information and data. For example, transceiver 1110 may send system information to the UE and transmit synchronization or reference signals. For this purpose, transceiver 1110 may include an RF transmitter that up-converts and amplifies the transmitted signals, and an RF receiver that performs low-noise amplification and down-conversion of the received signals. However, this is only one example of a transceiver, and the components of a transceiver are not limited to RF transmitters and RF receivers.

[0256] Transceiver 1110 may include wired and wireless transceivers and may include various components for transmitting and receiving signals. Furthermore, transceiver 1110 may receive signals via a communication channel (e.g., a wireless channel) and output them to controller 1120, and may also transmit signals output from controller 1120 via a communication channel. Additionally, transceiver 1110 may receive communication signals and output them to a processor, and may transmit signals output from the processor to a UE, other base stations, or any other entity via a wired or wireless network.

[0257] The memory 1130 can store programs and data required for base station operation. Furthermore, the memory 1130 can store control information or data contained in signals acquired by the base station. The memory 1120 can be composed of storage media, such as ROM, RAM, hard disk, CD-ROM, DVD, or a combination of storage media. Additionally, the memory 1120 can store at least one of the information transmitted and received via the transceiver 1110 and the information generated by the controller 1120.

[0258] In this disclosure, controller 1120 may be defined as a circuit, an application-specific integrated circuit (ASIC), or at least one processor. The processor may include a communication processor (CP) that performs communication control and an application processor (AP) that controls upper layers such as applications. Controller 1120 may control the overall operation of a base station according to embodiments of this disclosure. For example, controller 1120 may control the signal flow between various blocks to perform the operations shown in the flowchart above.

[0259] Figure 12 This is a schematic diagram of the structure of a UE according to an embodiment of the present disclosure.

[0260] refer to Figure 12 The UE may include a transceiver 1210, a UE controller 1220, and a memory 1230. The transceiver 1210, controller 1220, and memory 1230 may operate according to the UE communication method described above. However, the components of the UE are not limited to the examples described above. For example, the UE may include more or fewer components than those described above. For example, the UE may include a transceiver and a controller. Furthermore, the transceiver, controller, and memory may be implemented as a single chip.

[0261] Transceiver 1210 refers to both the receiver and transmitter of a UE, and can transmit / receive signals to / from a base station, other UEs, or network entities. Signals transmitted to and received from the base station may include control information and data. For example, transceiver 1210 can receive system information and synchronization or reference signals from the base station. To this end, transceiver 1210 may include an RF transmitter that up-converts and amplifies the transmitted signals, and an RF receiver that performs low-noise amplification and down-conversion on the received signals. However, this is only one embodiment of the transceiver, and the components are not limited to RF transmitters and RF receivers. Furthermore, the transceiver may include wired and wireless transceivers and may include various components for transmitting and receiving signals. Additionally, the transceiver can receive signals via a wireless channel and output them to controller 1220, and can also transmit signals output from controller 1220 via a wireless channel. Furthermore, the transceiver can receive communication signals and output them to a processor, and can transmit signals output from the processor to network entities via a wired or wireless network.

[0262] The memory 1230 can store programs and data required for UE operation. In addition, the memory can store control information or data contained in signals acquired by the UE. The memory 1230 can consist of storage media, such as ROM, RAM, hard disk, CD-ROM, or DVD, or a combination of storage media.

[0263] In this disclosure, controller 1220 may be defined as a circuit, an ASIC, or at least one processor. The processor may include a communication processor (CP) that performs communication control and an application processor (AP) that controls upper layers such as applications. Controller 1220 may control the overall operation of the UE according to embodiments of this disclosure. For example, controller 1220 may control the signal flow between various blocks to perform the operations shown in the flowchart above.

[0264] The methods described in the claims or the embodiments described herein may be implemented in hardware, software, or a combination of hardware and software.

[0265] In the case of a software implementation, a computer-readable storage medium may be provided for storing one or more programs (software modules). The one or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. The one or more programs may include instructions for causing the electronic device to perform the methods of the embodiments set forth in the claims or this disclosure.

[0266] Such programs (software modules or software) may be stored in non-volatile memory, including random access memory or flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), disk storage devices, optical disc-ROM (CD-ROM), digital versatile optical disc (DVD) or other types of optical storage devices, or magnetic tape. Alternatively, any combination of some or all of these may form a memory storing programs. Furthermore, electronic devices may include multiple such memories.

[0267] Furthermore, the program may be stored in an attachable storage device that can be accessed by the electronic device via a communication network (e.g., the Internet, intranet, local area network (LAN), wide area network (WLAN), and storage area network (SAN), or a combination thereof). Such a storage device can access the device executing embodiments of this disclosure via an external port. Additionally, a separate storage device on the communication network can access the device executing embodiments of this disclosure.

[0268] In specific embodiments of this disclosure, the elements included herein are represented in singular or plural form depending on the specific embodiment presented. However, the singular or plural representation is chosen for ease of description, and this disclosure is not limited to elements expressed in singular or plural form. Thus, even if any element is expressed in plural form, it may also consist of singular form, or even if any element is expressed in singular form, it may also consist of plural form.

[0269] Furthermore, although specific embodiments are described in the detailed description of this disclosure, various modifications may be made without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the appended claims, but also by the equivalents of the scope of the claims.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: Receive WUS resource configuration information from the base station for the Wake-up Signaling WUS; Based on the WUS resource configuration information, WUS is sent from the terminal in an idle or inactive state to the base station; as well as Receive signals for cell reselection from the base station.

2. The method according to claim 1, wherein, The signals used for cell reselection include at least one of System Information Block (SIB) or Synchronization Signal Block (SSB).

3. A method performed by a terminal in a wireless communication system, the method comprising: Receive low-power synchronization signal block LP-SSB from the first base station; Receive SSB from the second base station; as well as Cell reselection is performed based on the LP-SSB received from the first base station and the SSB received from the second base station.

4. The method according to claim 3, wherein, Different offset values ​​are applied to the LP-SSB received from the first base station and the SSB received from the second base station.

5. The method according to claim 3, further comprising: Obtain a Radio Resource Control (RRC) release message, wherein the RRC release message includes cell reselection priority information related to the LP-SSB.

6. The method according to claim 3, wherein, The first base station is in deep sleep mode, and the second base station is in wake-up mode or normal mode.

7. A method performed by a base station in a wireless communication system, the method comprising: Send WUS resource configuration information to the terminal for the wake-up signaling WUS; Based on the WUS resource configuration information, WUS is obtained from the terminal that is in an idle or inactive state; as well as Send a signal for cell reselection to the terminal.

8. The method according to claim 7, wherein, The signals used for cell reselection include at least one of System Information Block (SIB) or Synchronization Signal Block (SSB).

9. A terminal in a wireless communication system, the terminal comprising: A transceiver configured to send and receive signals; as well as The controller is configured as follows: Receive WUS resource configuration information from the base station for the Wake-up Signaling WUS. Based on the WUS resource configuration information, the terminal, which is in an idle or inactive state, sends WUS data to the base station. Receive signals for cell reselection from the base station.

10. The terminal according to claim 9, wherein, The signals used for cell reselection include at least one of System Information Block (SIB) or Synchronization Signal Block (SSB).

11. A terminal in a wireless communication system, the terminal comprising: A transceiver configured to send and receive signals; as well as The controller is configured as follows: Receive low-power synchronization signal block LP-SSB from the first base station. Receive SSB from the second base station, and Cell reselection is performed based on the LP-SSB received from the first base station and the SSB received from the second base station.

12. The terminal according to claim 11, wherein, Different offset values ​​are applied to the LP-SSB received from the first base station and the SSB received from the second base station, and The first base station is in deep sleep mode, and the second base station is in wake-up mode or normal mode.

13. The terminal according to claim 11, wherein, The controller is configured as follows: Obtain a Radio Resource Control (RRC) release message, wherein the RRC release message includes cell reselection priority information related to the LP-SSB.

14. A base station in a wireless communication system, the base station comprising: A transceiver configured to send and receive signals; as well as The controller is configured as follows: Send WUS resource configuration information to the terminal for use in the WUS wake-up signaling. Based on the WUS resource configuration information, WUS is obtained from the terminal in an idle or inactive state, and Send a signal for cell reselection to the terminal.

15. The base station according to claim 14, wherein, The signals used for cell reselection include at least one of System Information Block (SIB) or Synchronization Signal Block (SSB).

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