Method and apparatus for saving power of user equipment in wireless communication system

Abstract

A method performed by a user equipment (UE) in a wireless communication system is provided. The method comprises the following steps: receiving high-level signaling from a base station, the high layer signaling includes a power saving offset (PS-offset) indicating that the UE starts monitoring a first start time of a physical downlink channel (PDCCH) for downlink control information (DCI) notifying power saving information outside a discontinuous reception (DRX) activation time before a second start time of a drx-onDuration timer, and a parameter indicating a search space; identifying at least one PDCCH monitoring occasion of the DCI based on the PS-offset and the parameter indicating the search space; and monitoring the DCI at the at least one PDCCH monitoring occasion.

Description

[0001] This application is a divisional application of a PCT invention patent application with an application date of October 30, 2020, application number 202080076432.4, and invention name “Method and device for saving power of user equipment in a wireless communication system”. Technical Field

[0002] The present disclosure relates to methods and apparatus for saving power of a user equipment (UE) in a wireless communication system. Background Art

[0003] In order to meet the increased demand for wireless data traffic after the commercialization of the 4th generation (4G) communication system, considerable efforts have been made to develop an improved 5th generation (5G) communication system or a quasi-5G communication system. Therefore, the 5G communication system or the quasi-5G communication system is called a super 4G network communication system or a post-long term evolution (LTE) system. In order to achieve high data rates, it is being considered to implement the 5G communication system in the millimeter wave (mmWave) frequency band (e.g., the 60 gigahertz (GHz) frequency band). In order to reduce the propagation path loss of radio waves at millimeter wave frequencies and increase the propagation distance of radio waves, 5G communication system technologies such as beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna systems are being discussed. In addition, in order to improve the system network of the 5G communication system, the development of technologies such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, multi-point coordination (CoMP), and reception interference elimination has been carried out. In addition, for 5G communication systems, hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM) schemes; and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0004] The Internet has evolved from a human-centered connection network through which humans generate and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed elements such as objects. Internet of Everything (IoE) technology is emerging, in which technologies related to IoT are combined with technologies for processing big data, for example, by connecting to cloud servers. In order to realize IoT, various technical components are required, such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, security technology, etc. In recent years, technologies including sensor networks for connecting objects, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied. In the IoT environment, smart Internet technology (IT) services can be provided to collect and interpret data obtained from interconnected objects and create new value in human life. As existing information technology (IT) technologies and various industries merge and combine with each other, IoT can be applied to various fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, medical care, smart home appliances, high-quality medical services, etc.

[0005] Attempts are being made to apply 5G communication systems to IoT networks. For example, technologies related to sensor networks, M2M communications, MTC, etc. are implemented by utilizing 5G communication technologies including beamforming, MIMO, array antennas, etc. Cloud RAN as an application of the above-mentioned big data processing technology can be an example of the fusion of 5G communication technology and IoT technology.

[0006] As various services can be provided according to the development of wireless communication systems, methods for efficiently providing these services are needed. In particular, communication methods that save power of user equipment are needed so that services can be provided to users for a longer time. Summary of the invention

[0007] [Technical solution]

[0008] A communication method and apparatus for saving power of a user equipment (UE) in a wireless communication system are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0010] Figure 1 A diagram illustrating a basic structure of a time-frequency domain in a fifth generation (5G) system is shown.

[0011] Figure 2 A diagram illustrating the frame, subframe and slot structure of a 5G system is shown;

[0012] Figure 3A diagram illustrating an example of configuring bandwidth portions in a 5G system is shown;

[0013] Figure 4 A diagram illustrating an example of configuring a control resource set for a downlink control channel in a 5G system is shown;

[0014] Figure 5 A diagram illustrating the structure of a downlink control channel in a 5G system is shown;

[0015] Figure 6 A diagram illustrating an example of a discontinuous reception (DRX) operation of a 5G system is shown;

[0016] Figure 7 A diagram illustrating an example of a power save signal (POSS) configuration method according to an embodiment of the present disclosure is shown;

[0017] Figure 8 A diagram illustrating an example of a POSS configuration method according to an embodiment of the present disclosure is shown;

[0018] Fig. 9 A flow chart showing a method for saving power of a user equipment (UE) in a wireless communication system according to an embodiment of the present disclosure is shown;

[0019] Fig.10 A flow chart showing a method for saving power of a user equipment (UE) in a wireless communication system according to an embodiment of the present disclosure is shown;

[0020] Fig.11 shows a block diagram illustrating the internal structure of a UE according to an embodiment of the present disclosure; and

[0021] Fig.12 A block diagram illustrating the internal structure of a base station according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0022] According to one aspect of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system is provided. The method includes: receiving high-layer signaling from a base station, the high-layer signaling including a power saving offset (PS-offset) indicating a first start time of the UE to start monitoring a physical downlink channel (PDCCH) for downlink control information (DCI) notifying power saving information outside a discontinuous reception (DRX) activation time before a second start time of a drx-onDuration timer and a parameter indicating a search space; identifying at least one PDCCH monitoring opportunity of the DCI based on the PS-offset and the parameter indicating the search space; and monitoring the DCI at at least one PDCCH monitoring opportunity.

[0023] In an embodiment, the parameters indicating the search space include a monitoring period and a monitoring offset in units of time slots, a monitoring duration in units of time slots, and at least one symbol in a time slot configured for PDCCH monitoring.

[0024] In an embodiment, identifying at least one PDCCH monitoring opportunity of the DCI comprises: identifying at least one monitoring opportunity in a monitoring time interval located before the second start time and after the first start time in at least one monitoring time interval indicated by a parameter indicating a search space.

[0025] In an embodiment, the at least one monitoring time interval indicated by the parameter indicating the search space comprises each time interval during the monitoring duration from each time slot determined by a monitoring offset from each first time slot of each time period where a period of the monitoring cycle exists.

[0026] In an embodiment, identifying at least one PDCCH monitoring opportunity for the DCI further comprises: identifying at least one monitoring opportunity located before a predetermined time gap from the second start time.

[0027] According to another aspect of the present disclosure, a user equipment (UE) in a wireless communication system is provided. The UE includes: a transceiver; and at least one processor, which is operably coupled to the transceiver and configured to: control the transceiver to receive high-layer signaling from a base station, the high-layer signaling including a power saving offset (PS-offset) indicating a first start time of the UE to start monitoring a physical downlink channel (PDCCH) for downlink control information (DCI) notifying power saving information outside a discontinuous reception (DRX) activation time before a second start time of a drx-onDuration timer and a parameter indicating a search space, identify at least one PDCCH monitoring opportunity of the DCI based on the PS-offset and the parameter indicating the search space, and monitor the DCI at at least one PDCCH monitoring opportunity.

[0028] In an embodiment, the parameters indicating the search space include a monitoring period and a monitoring offset in units of time slots, a monitoring duration in units of time slots, and at least one symbol in a time slot configured for PDCCH monitoring.

[0029] In an embodiment, the at least one processor is further configured to: identify at least one monitoring opportunity in the monitoring time interval located before the second start time and after the first start time in at least one monitoring time interval indicated by the parameter indicating the search space.

[0030] In an embodiment, wherein the at least one monitoring time interval indicated by the parameter indicating the search space comprises each time interval during the monitoring duration from each time slot, each time interval being determined by a monitoring offset from each first time slot of each time period in which a period of the monitoring cycle exists.

[0031] In an embodiment, the at least one processor is further configured to identify at least one monitoring opportunity that is located before a predetermined time gap from the second start time.

[0032] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0033] Before proceeding to the following detailed description, it may be helpful to set forth the definitions of certain words and phrases used in this patent document: the terms "include" and "including" and their derivatives mean including but not limited to; the term "or" is inclusive and means and / or; the phrases "associated with" and "associated with" and their derivatives may mean including, included, interconnected with, containing, contained within, connected to or connected with, coupled to or coupled with, communicable with, cooperating with, crosslinked, juxtaposed, proximate, bound to or bound with, having, having a property of, etc.; and the term "controller" means any device, system, or part thereof that controls at least one operation, such device may be implemented in hardware, firmware, or software, or some combination of at least two thereof. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0034] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a portion thereof suitable for implementation with a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical or other communication links that transmit temporary electrical or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store data and subsequently overwrite data, such as rewritable optical disks or erasable memory devices.

[0035] Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

[0036] [Invention method]

[0037] Discussed below Figures 1 to 11 , and the various embodiments used to describe the principles of the present disclosure in this patent document are only for illustration and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0039] When describing the embodiments of the present disclosure, the technical contents that are well known in the field to which the present disclosure belongs and are not directly related to the present disclosure will not be described. By omitting unnecessary descriptions, the present disclosure is conveyed more clearly without obscuring the subject matter of the present disclosure.

[0040] For the same reason, some elements in the accompanying drawings are exaggerated, omitted or schematically shown. In addition, the size of each element does not reflect the actual size. In each figure, the same reference numeral is assigned to the same or corresponding element.

[0041] The advantages and features of the present disclosure and the methods for realizing them will become more clear from the embodiments of the present disclosure described in detail below in conjunction with the accompanying drawings. However, it should be understood that the present disclosure is not limited to the following embodiments of the present disclosure, and various modifications can be made without departing from the scope of the present disclosure. The embodiments of the present disclosure set forth herein are provided to make the present disclosure thorough and complete, and to fully convey the concept of the present disclosure to those of ordinary skill in the art. The present disclosure should be defined by the appended claims. Throughout the specification, the same reference numerals represent the same elements. In addition, when describing the present disclosure, when it is determined that the detailed description of the relevant functions or configurations is unnecessarily obscure the subject matter of the present disclosure, its detailed description can be omitted. The terms used herein are defined by considering the functions in the present disclosure, but these terms can vary according to the intentions, precedents, etc. of the user or those of ordinary skill in the art. Therefore, it should be defined based on the content of the entire specification.

[0042] Throughout the disclosure, the expression "at least one of a, b, or c" means only a, only b, only c; both a and b, both a and c, both b and c; all of a, b, and c; or variations thereof.

[0043] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0044] In this disclosure, a controller may also be referred to as a processor.

[0045] Throughout the specification, a layer (or a layer arrangement) may also be referred to as an entity.

[0046] In the following, the base station is the subject that performs the resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. In the present disclosure, a downlink (DL) is a radio transmission path for a signal transmitted from a base station to a terminal, and an uplink (UL) is a radio transmission path for a signal transmitted from a terminal to a base station. In addition, although the long-term evolution (LTE), advanced LTE (LTE-A), or a fifth generation (5G) system will be described as an example below, the embodiments of the present disclosure may be applicable to other communication systems with similar technical backgrounds or channel forms. For example, this may include 5G mobile communication technology (5G, new radio, NR) developed after LTE-A. 5G may be a concept including existing LTE, LTE-A, and similar other services. In addition, without departing from the scope of the present disclosure, the present disclosure may be applicable to other communication systems by some modifications.

[0047] It should be understood that the combination of each frame of the flowchart and the flowchart can be performed by computer program instructions. Since these computer program instructions can be embedded in the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device, the instructions executed by the processor of the computer or other programmable data processing device generate a module for performing the functions described in the (one or more) flowchart frame. Because these computer program instructions can also be stored in a computer-usable or computer-readable memory, which can guide the computer or other programmable data processing device to implement the function in a specific way, the instructions stored in the computer-usable or computer-readable memory can also produce products containing instruction modules for performing the functions described in the (one or more) flowchart frame. Since computer program instructions can also be installed on a computer or other programmable data processing device, a computer-implemented process is generated by performing a series of operations on a computer or other programmable data processing device, and the instructions for executing a computer or other programmable data processing device can provide operations for performing the functions described in the (one or more) flowchart frame.

[0048] In addition, each box can represent a part of a module, segment or code, which includes one or more executable instructions for performing one or more) specified logical functions. It should also be noted that in some alternative embodiments, the functions described in the box may not occur in the order marked in the figure. For example, two boxes shown in succession can actually be executed substantially simultaneously, or boxes can sometimes be executed in reverse order, depending on the functions involved.

[0049] The term "module" or "-device" used herein refers to a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and the "module" or "-device" performs certain functions. However, the term "module" or "-device" is not limited to software or hardware. The term "module" or "-device" can be configured in an addressable storage medium, or can be configured to reproduce one or more processors. Therefore, for example, the term "module" includes elements such as software elements, object-oriented software elements, class elements and task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided in the element and "module" or "-device" can be combined with fewer elements and "module" or "-device", or can be separated from additional elements and "module" or "-device". In addition, the element and "module" or "-device" can be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. Furthermore, in the embodiments of the present disclosure, a “module” or a “machine” may include one or more processors.

[0050] Radio communication systems have evolved from systems that provide voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services such as 3GPP's High Speed ​​Packet Access (HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-A, LTE-Pro, 3GPP2's High Speed ​​Packet Data (HRPD), Ultra Mobile Broadband (UMB), and communication standards such as IEEE 802.16e.

[0051] As a representative example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme in DL and a single carrier frequency division multiple access (SC-FDMA) scheme in UL. UL refers to a radio link through which a terminal (UE or MS) transmits data or a control signal to a base station (eNode B or BS), and DL refers to a radio link through which a base station transmits data or a control signal to a terminal. In the multiple access scheme as described above, the data or control information of each user can be distinguished by performing allocation and operation so that the time-frequency resources used to carry the data or control information of each user do not overlap with each other (i.e., establishing orthogonality).

[0052] The future communication system after LTE, namely the 5G communication system, must be able to freely reflect the various needs of users and service providers. Therefore, it is necessary to support services that meet various needs at the same time. Services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (MMTC), and ultra-reliable low latency communication (URLLC).

[0053] eMBB is designed to provide data rates higher than those supported by LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20Gbps in DL and a peak data rate of 10Gbps in UL for a single base station. In addition, the 5G communication system must provide peak data rates and simultaneously provide increased end-user perceived data rates. In order to meet such requirements, various transmission and reception technologies need to be improved, including improved multiple-input multiple-output (MIMO) transmission technologies. In addition, in the 2GHz band used by LTE, signals are transmitted using a transmission bandwidth of up to 20MHz. However, the 5G communication system uses a frequency bandwidth wider than 20MHz in the 3-6GHz band or the 6GHz or higher band. Therefore, the data rate required by the 5G communication system can be met.

[0054] At the same time, mMTC is also being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. In order to efficiently provide IoT, mMTC needs to support the access of a large number of terminals in a cell, improve the coverage of terminals, improve battery life, and reduce terminal costs. Since IoT is attached to various sensors and various devices to provide communication functions, IoT must be able to support a large number of terminals in a cell (for example, 1,000,000 terminals / km 2 ). In addition, due to the nature of the service, terminals supporting mMTC are likely to be located in shadow areas not covered by cells, such as basements of buildings. Therefore, a wider coverage area than other services provided by 5G communication systems may be required. Terminals supporting mMTC must be configured as inexpensive terminals, and it is difficult to frequently replace the battery of the terminal. Therefore, a very long battery life, such as 10 to 15 years, may be required.

[0055] Finally, URLLC is a cellular-based wireless communication service for a specific purpose (mission-critical). For example, consider services for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote medical care, emergency alerts, etc. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, services supporting URLLC must meet air interface latency of less than 0.5 milliseconds and have 10 -5Therefore, for services supporting URLLC, the 5G system must provide a smaller transmission time interval (TTI) than other services, and the design must allocate wide resources within the frequency band to ensure the reliability of the communication link.

[0056] The three services of 5G, namely eMBB, URLLC and mMTC, can be multiplexed in a single system. In this case, different transmission and reception technologies and transmission and reception parameters can be used between services to meet the different needs of the corresponding services. 5G is not limited to the above three services.

[0057] Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the accompanying drawings.

[0058] Figure 1 A diagram illustrating the basic structure of the time-frequency domain in a 5G system is shown, which is a radio resource domain in which data or control channels are transmitted.

[0059] exist Figure 1 In the , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time domain and the frequency domain is a resource element (RE) 101, which can be defined as an OFDM symbol 102 on the time axis and a subcarrier 103 on the frequency axis. (eg, 12) consecutive REs may constitute one resource block (RB) 104 .

[0060] Figure 2 A diagram showing the time slot structure considered in a 5G system.

[0061] Figure 2 An example of the structure of a frame 200, a subframe 201, and a time slot 202 is shown in FIG. One frame 200 may be defined as 10 milliseconds (ms). One subframe 201 may be defined as 1 ms. Thus, one frame 200 may include a total of 10 subframes 201. One time slot 202 or 203 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). ). A subframe 201 may include one or more time slots 202 and 203. The number of time slots 202 and 203 of each subframe 201 may vary according to the setting values ​​(μ) 204 and 205 of the subcarrier spacing. Figure 2 In the example of FIG. 1 , the case where the setting value of the subcarrier spacing is μ=0 (204) and μ=1 (205) is shown. In the case of μ=0 (204), one subframe 201 may include one time slot 202, and in the case of μ=1 (205), one subframe 201 may include two time slots 203. That is, the number of time slots in each subframe is The number of time slots per frame can be changed according to the setting value μ of the subcarrier spacing. According to each setting value μ of the subcarrier spacing and It can be defined as shown in Table 1 below.

[0062] [Table 1]

[0063]

[0064] Next, a bandwidth part (BWP) configuration in a 5G communication system will be described in detail with reference to the accompanying drawings.

[0065] Figure 3 A diagram illustrating an example of configuring a BWP in a 5G system is shown.

[0066] Figure 3 An example is shown in which the UE bandwidth 300 is configured as two BWPs, namely BWP#1 301 and BWP#2 302. The base station may configure one or more BWPs for the UE, and may configure the following information about each BWP:

[0067] [Table 2]

[0068]

[0069] The present disclosure is not limited to the above examples. In addition to the configuration information, various parameters related to the BWP may also be configured to the UE. The base station may transmit the information to the UE through high-layer signaling, such as radio resource control (RRC) signaling. At least one of the configured one or more BWPs may be activated. Whether to activate the configured BWP may be semi-statically transmitted from the base station to the UE through RRC signaling, or dynamically transmitted through downlink control information (DCI).

[0070] According to some embodiments of the present disclosure, an initial BWP may be configured for a UE before an RRC connection is made for initial access from a base station through a master information block (MIB). More specifically, the UE may receive configuration information about a search space and a control resource set (CORESET), through which a physical downlink control channel (PDCCH) of system information (rest system information (RMSI) or system information block 1 (SIB1)) required for initial access may be transmitted through the MIB in an initial access operation. The control resource set and search space configured as the MIB may be respectively regarded as identification (ID) 0. The base station may notify the UE of configuration information such as frequency allocation information, time allocation information, and parameter set of the control resource set #0 through the MIB. In addition, the base station may notify the UE of configuration information for monitoring the periodicity and timing of the control resource set #0, i.e., the configuration information of the search space #0, through the MIB. The UE may determine or consider the frequency domain of the control resource set #0 obtained from the MIB as the initial BWP for initial access. In this case, the ID of the initial BWP may be determined (or considered) to be zero.

[0071] The BWP configuration supported by 5G can be used for various purposes.

[0072] According to some embodiments of the present disclosure, when the bandwidth supported by the UE is less than the system bandwidth, this can be supported by BWP configuration. For example, the base station can configure the frequency position of the BWP for the UE (configuration information 2), so that the UE can transmit and receive data at a specific frequency position within the system bandwidth.

[0073] In addition, according to some embodiments of the present disclosure, the base station may configure multiple BWPs for the UE to support different parameter sets. For example, two BWPs may be configured to use a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz, respectively, to support random UEs that use a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz for data transmission and reception. Different BWPs may be frequency-division multiplexed. When attempting to transmit and receive data at a specific subcarrier spacing, the BWP configured with the corresponding subcarrier spacing may be activated.

[0074] In addition, according to some embodiments of the present disclosure, the base station may configure a BWP with bandwidths of different sizes for the UE to reduce the power consumption of the UE. For example, when the UE supports a very large bandwidth, such as a bandwidth of 100 MHz, and always transmits and receives data on the corresponding bandwidth, the transmission or reception may cause very high power consumption in the UE. In particular, when the UE performs monitoring on an unnecessary DL control channel with a large bandwidth of 100 MHz even when there is no traffic, the monitoring may be very inefficient in terms of power consumption. Therefore, in order to reduce the power consumption of the UE, the base station may configure a BWP with a relatively small bandwidth, such as a BWP of 20 megahertz (MHz), for the UE. In the absence of traffic, the UE can perform monitoring operations on a BWP of 20 MHz. When the data to be transmitted or received has appeared, the UE can transmit and receive data in a BWP of 100 MHz according to the instructions of the base station.

[0075] In the method for configuring BWP, the UE may receive configuration information about the initial BWP through the MIB in an initial connection operation before RRC connection. More specifically, the UE may be configured with a control resource set (CORESET) for a DL control channel, through which a DCI for scheduling a system information block (SIB) may be transmitted from the MIB of a physical broadcast channel (PBCH). The bandwidth of the control resource set configured for the MIB may be regarded as the initial BWP. The UE may receive a physical downlink shared channel (PDSCH) through which the SIB is transmitted through the configured initial BWP. The initial BWP may be used for reception of other system information (OSI), paging and random access, and SIB.

[0076] When one or more BWPs have been configured for a UE, the base station can indicate to the UE to switch BWPs by using the BWP indicator field in the DCI. Figure 3 In the present invention, when the BWP currently activated by the UE is BWP#1 301, the base station may indicate BWP#2 302 to the UE by using the BWP indicator in the DCI, and the UE may perform BWP switching to BWP#2 302 indicated by the BWP indicator in the received DCI.

[0077] As described above, DCI-based BWP switching can be indicated by DCI scheduling PDSCH or physical uplink shared channel (PUSCH). Therefore, when the UE receives a request to switch BWP, it should be able to receive or transmit PDSCH or PUSCH scheduled by DCI in the switched BWP without difficulty. To this end, the standard specifies the delay time (T BWP ) requirements, and can be defined, for example, as follows.

[0078] [Table 2-1]

[0079]

[0080] The BWP switching time requirement supports type 1 or type 2, depending on the UE capability. The UE can report the supported BWP delay time type to the base station.

[0081] When the UE receives the DCI including the BWP switching indicator in time slot n according to the BWP switching delay time requirement, the UE may BWP The base station completes the switching to the new BWP indicated by the BWP switching indicator in the time, and can perform transmission and reception on the data channel scheduled by the corresponding DCI in the switched new BWP. When the base station intends to schedule the data channel to the new BWP, the base station can consider the BWP switching delay time (T BWP ) to determine the time domain resource allocation of the data channel. That is, when the base station schedules the data channel to the new BWP, the method for determining the time domain resource allocation of the data channel performed by the base station may include scheduling the corresponding data channel after the BWP switching delay time. Therefore, the UE may not expect the DCI indicating the BWP switching to indicate a time domain less than the BWP switching delay time (T BWP )’s time slot offset (K0 or K2) value.

[0082] When the UE receives a DCI indicating a BWP switch (e.g., DCI format 1_1 or 0_1), the UE may not perform transmission or reception during a time interval from the 3rd symbol of the time slot in which the PDCCH including the DCI is received to the start time of the time slot indicated by the time slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, when the UE receives a DCI indicating a BWP switch in time slot n, and the time slot offset value indicated by the DCI is K, the UE may not perform transmission or reception from the 3rd symbol of time slot n to the symbol before time slot n+K (i.e., the last symbol of time slot n+K-1).

[0083] Next, the synchronization signal (SS) / PBCH block in 5G will be described.

[0084] The SS / PBCH block may refer to a physical layer channel block including a primary SS (PSS), a secondary SS (SSS), and a PBCH. Specifically, the SS / PBCH block is as follows:

[0085] -PSS: A signal that serves as a reference for DL ​​time / frequency synchronization and provides some information of the cell ID.

[0086] -SSS: A signal that serves as a reference for DL ​​time / frequency synchronization and provides the remaining cell ID information not provided by PSS. In addition, SSS can serve as a reference signal for demodulation of PBCH.

[0087] -PBCH: A channel that provides basic system information required for transmitting and receiving data channels and control channels of UEs. The basic system information may include search space-related control information indicating radio resource mapping information of control channels, scheduling control information of a separate data channel for transmitting system information, etc.

[0088] -SS / PBCH block: The SS / PBCH block includes a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks may be transmitted within 5 ms, and the one or more transmitted SS / PBCH blocks may be identified by an index.

[0089] The UE can detect the PSS and SSS in the initial access operation and can decode the PBCH. The UE can obtain the MIB from the PBCH and can be configured with the control resource set (CORESET) #0 (which can correspond to the control resource set with a CORESET index of 0) therefrom. The UE can monitor the control resource set #0 under the assumption that the demodulation reference signal (DMRS) transmitted in the selected SS / PBCH block and the control resource set #0 is quasi-co-located (QCLed). The UE can receive system information by using the DL control information transmitted from the control resource set #0. The UE can obtain configuration information related to the random access channel (RACH) required for initial access from the received system information. The UE can transmit the physical RACH (PRACH) to the base station by considering the selected SS / PBCH index, and the base station that has received the PRACH can obtain information about the SS / PBCH block index selected by the UE. The base station can know which block the UE has selected in the SS / PBCH block, and can know the fact that the control resource set #0 associated with it is monitored.

[0090] Next, DCI in the 5G system will be described in detail.

[0091] In the 5G system, scheduling information about UL data (or PUSCH) or DL ​​data (or PDSCH) is transmitted from the base station to the UE via DCI. The UE can monitor the fallback DCI format and non-fallback DCI format about PUSCH or PDSCH. The fallback DCI format may include fixed fields predefined between the base station and the UE, while the non-fallback DCI format may include configurable fields.

[0092] DCI can be transmitted via PDCCH after performing channel coding and modulation on it. A cyclic redundancy check (CRC) can be attached to the DCI message payload. The CRC can be scrambled by a radio network temporary identifier (RNTI) corresponding to the UE's identity. Different RNTIs can be used according to the purpose of the DCI message (e.g., UE-specific data transmission, power control commands, or random access responses). That is, the RNTI is not explicitly transmitted, but is included in the CRC calculation process and then transmitted. When receiving a DCI message transmitted on the PDCCH, the UE can check the CRC by using the allocated RNTI. When the CRC check result is correct, the UE can know that the corresponding message has been transmitted to the UE.

[0093] For example, the DCI that schedules PDSCH for system information (SI) can be scrambled by SI-RNTI. The DCI that schedules PDSCH for random access response (RAR) message can be scrambled by RA-RNTI. The DCI that schedules PDSCH for paging message can be scrambled by P-RNTI. The DCI that notifies the slot format indicator (SFI) can be scrambled by SFI-RNTI. The DCI that notifies the transmission power control (TPC) can be scrambled by TPC-RNTI. The DCI that schedules UE-specific PDSCH or PUSCH can be scrambled by C-RNTI (cell RNTI).

[0094] DCI format 0_0 may be used as a fallback DCI for scheduling PUSCH. In this case, the CRC may be scrambled by the C-RNTI. The DCI format 0_0 in which the CRC is scrambled by the C-RNTI may include, for example, the following information.

[0095] [Table 3]

[0096]

[0097] DCI format 0_1 ​​may be used as a non-fallback DCI for scheduling PUSCH. In this case, the CRC may be scrambled by the C-RNTI. The DCI format 0_1 ​​in which the CRC is scrambled by the C-RNTI may include, for example, the following information.

[0098] [Table 4]

[0099]

[0100]

[0101] DCI format 1_0 may be used as a fallback DCI for scheduling PDSCH. In this case, CRC may be scrambled by C-RNTI. DCI format 1_0 in which CRC is scrambled by C-RNTI may include, for example, the following information.

[0102] [Table 5]

[0103]

[0104] DCI format 1_1 may be used as a non-fallback DCI for scheduling PDSCH. In this case, the CRC may be scrambled by the C-RNTI. The DCI format 1_1 in which the CRC is scrambled by the C-RNTI may include, for example, the following information.

[0105] [Table 6]

[0106]

[0107] Hereinafter, a method for allocating time domain resources to a data channel in a 5G communication system will be described.

[0108] The base station can configure a table of time domain resource allocation information for PDSCH and PUSCH for the UE through high-level signaling (e.g., RRC signaling). For PDSCH, a table including a maximum maxNrofDL-Allocations (=16) entry can be configured. For PUSCH, a table including a maximum maxNrofUL-Allocations (=16) entry can be configured. The time domain resource allocation information may include, for example, PDCCH-to-PDSCH slot timing (K0) (corresponding to the time interval of the time slot unit between the time of receiving the PDCCH and the time of transmitting the PDSCH scheduled by the received PDCCH), PDCCH-to-PUSCH slot timing (K2) (corresponding to the time interval of the time slot unit between the time of receiving the PDCCH and the time of transmitting the PUSCH scheduled by the received PDCCH), information about the position and length of the starting symbol of scheduling PDSCH or PUSCH in the time slot, PDSCH or PUSCH mapping type, etc. For example, the information shown in the following table can be notified to the UE from the base station.

[0109] [Table 7]

[0110]

[0111] [Table 8]

[0112]

[0113] The base station may inform the UE of one of the entries in the table of time domain resource allocation information through L1 signaling (e.g., DCI) (e.g., this may be indicated by a "time domain resource allocation" field in the DCI). The UE may obtain the time domain resource allocation information of the PDSCH or PUSCH based on the DCI received from the base station.

[0114] Hereinafter, a DL control channel in a 5G communication system will be described in more detail with reference to the accompanying drawings.

[0115] Figure 4 A diagram illustrating an example of a control resource set (CORESET) in which a DL control channel is transmitted in a 5G wireless communication system is shown. Figure 4 An example is shown in which a UE BWP 410 is configured on the frequency axis and two control resource sets (control resource set #1 401 and control resource set #2 402) are configured in a time slot 420 on the time axis. The control resource sets 401 and 402 may be configured as specific frequency resources 403 within the entire UE BWP 410 on the frequency axis. One or more OFDM symbols may be configured on the time axis, and the OFDM symbol may be defined as a control resource set duration 404. Figure 4 In the example shown, control resource set #1 401 is configured with a control resource set duration of two symbols, and control resource set #2 402 is configured with a control resource set duration of one symbol.

[0116] The base station can configure the 5G control resource set for the UE through high-level signaling (e.g., SI, MIB, RRC signaling). Configuring the control resource set for the UE means providing information such as the control resource set identifier, the frequency position of the control resource set, and the symbol duration of the control resource set. For example, the following information may be included.

[0117] [Table 9]

[0118]

[0119] In Table 9, the tci-StatesPDCCH (abbreviated as transmission configuration indication (TCI) state) configuration information may include information about one or more SS / PBCH block indices or channel state information reference signal (CSI-RS) indices that have a QCLed relationship with the DMRS transmitted in the corresponding control resource set.

[0120] Figure 5 A diagram illustrating an example of a basic unit of time and frequency resources constituting a DL control channel that can be used in 5G is shown. Figure 5 , the basic unit of time and frequency resources constituting the control channel may be referred to as a resource element group (REG) 503. REG 503 may be defined by one OFDM symbol 501 on the time axis and one physical resource block (PRB) 502 (i.e., 12 subcarriers) on the frequency axis. The base station may cascade REG 503 to configure a DL control channel allocation unit.

[0121] like Figure 5As shown, when the basic unit for allocating a DL control channel in 5G is called a control channel element (CCE) 504, one CCE 504 may include a plurality of REGs 503. Figure 5 In the example shown, REG 503 may include 12 resource elements (REs), and when one CCE 504 includes six REGs 503, one CCE 504 may include 72 REs. When a DL control region (e.g., a DL control resource set) is configured, the DL control region may include a plurality of CCEs 504. A specific DL control channel may be transmitted after being mapped to one or more CCEs 504 according to an aggregation level (AL) in the DL control region. The CCEs 504 in the control region are distinguished by numbers. In this case, the numbers of the CCEs 504 may be allocated according to a logical mapping scheme.

[0122] Figure 5 The basic unit of the DL control channel shown, namely, REG 503, may include an RE to which DCI is mapped and an area to which DMRS 505, which is a reference signal for decoding DCI, is mapped. Figure 5 As shown, three DMRS 505 can be transmitted in one REG 503. Depending on the AL, the number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8 or 16. Different numbers of CCEs can be used to achieve link adaptation of the DL control channel. For example, when AL=L, one DL control channel can be transmitted by L CCEs. The UE must detect the signal in a state where the UE does not know information about the DL control channel, and a search space representing a set of CCEs is defined for blind decoding. The search space is a set of DL control channel candidates, which includes CCEs that the UE must attempt to decode at a given AL. Because there are multiple ALs that form a bundle from 1, 2, 4, 8 or 16 CCEs, the UE can have multiple search spaces. A search space set can be defined as a set of search spaces in all configured ALs.

[0123] The search space can be divided into a common search space and a UE-specific search space. A group of specific UEs or all UEs can check the common search space of the PDCCH to receive cell common control information, such as dynamic scheduling of system information or paging messages. For example, PDSCH scheduling allocation information for the transmission of SIBs including cell operator information, etc. can be received by checking the common search space of the PDCCH. In the case of a common search space, since a group of specific UEs or all UEs must receive the PDCCH, the common search space can be defined as a set of pre-specified CCEs. Scheduling allocation information about UE-specific PDSCH or PUSCH can be received by checking the UE-specific search space of the PDCCH. The UE-specific search space can be UE-specifically defined as a function of the UE identity and various system parameters.

[0124] In 5G, the search space parameters of PDCCH can be configured from the base station to the UE through high-level signaling (e.g., SIB, MIB, RRC signaling, etc.). For example, the base station can configure the number of PDCCH candidates in each ALL, the monitoring period of the search space, the monitoring timing of the symbol unit in the search space time slot, the search space type (common search space or UE-specific search space), the combination of RNTI and DCI format to be monitored in the search space, the control resource set index of the monitoring search space, etc. For example, the parameters of the search space of PDCCH may include the following information.

[0125] [Table 10]

[0126]

[0127]

[0128] The base station may configure one or more search space sets for the UE according to the configuration information. According to an embodiment of the present disclosure, the base station may configure search space set 1 and search space set 2 for the UE. The base station may configure search space set 1 for the UE so as to monitor DCI format A scrambled by X-RNTI in the common search space. The base station may configure search space set 2 for the UE so as to monitor DCI format B scrambled by Y-RNTI in the UE-specific search space.

[0129] According to the configuration information, one or more search space sets may exist in a common search space or a UE-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, while search space set #3 and search space set #4 may be configured as UE-specific search spaces.

[0130] In the common search space, the following combinations of DCI formats and RNTIs may be monitored. However, the present disclosure is not limited thereto.

[0131] -DCI format 0_0 / 1_0, CRC is scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0132] -DCI format 2_0, CRC scrambled by SFI-RNTI

[0133] -DCI format 2_1, CRC scrambled by INT-RNTI

[0134] -DCI format 2_2, CRC is scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0135] -DCI format 2_3, CRC scrambled by TPC-SRS-RNTI

[0136] In the UE-specific search space, the following combinations of DCI formats and RNTIs may be monitored. However, the present disclosure is not limited thereto.

[0137] -DCI format 0_0 / 1_0, CRC is scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0138] -DCI format 1_0 / 1_1, CRC is scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0139] The specified RNTI may follow the definition and usage described below.

[0140] -C-RNTI (Cell RNTI): used for UE-specific PDSCH scheduling

[0141] -TC-RNTI (Temporary Cell RNTI): used for UE-specific PDSCH scheduling

[0142] -CS-RNTI (Configured Scheduling RNTI): used for semi-statically configured UE-specific PDSCH scheduling

[0143] -RA-RNTI (Random Access RNTI): used for PDSCH scheduling in random access operation

[0144] -P-RNTI (Paging RNTI): used for PDSCH scheduling of transmission paging

[0145] -SI-RNTI (System Information RNTI): used for PDSCH scheduling in which system information is transmitted

[0146] -INT-RNTI (interrupt RNTI): used to notify whether to puncture the PDSCH

[0147] -TPC-PUSCH-RNTI (Transmission Power Control of PUSCHRNTI): used to indicate the power control command of PUSCH

[0148] -TPC-PUCCH-RNTI (Transmission Power Control of PUCCH RNTI): used to indicate the power control command of PUCCH

[0149] -TPC-SRS-RNTI (Transmission Power Control of SRS RNTI): used to indicate the power control command of SRS

[0150] The above specified DCI format may follow the following definition.

[0151] [Table 11]

[0152]

[0153] In 5G, the search space of AL L in the control resource set p and search space set s can be expressed as follows.

[0154] [Formula 1]

[0155]

[0156] -L: aggregation level (AL)

[0157] -n CI : Carrier index

[0158] -N CCE,p : Controls the total number of CCEs in resource set p

[0159] Time slot index

[0160] Number of PDCCH candidates for ALL

[0161] PDCCH candidate index of AL L

[0162] -i=0,...,L-1

[0163] Y p,-1 =n RNTI ≠0,A 0 =39827,A 1 =39829,A 2 =39839,D=65537

[0164] -n RNTI :UE ID

[0165] The value may correspond to zero in the common search space.

[0166] In case of UE-specific search space, The value may correspond to a value that changes according to the UE identity (C-RNTI or an ID configured by the base station for the UE) and the time index.

[0167] In 5G, since multiple search space sets can be configured with different parameters (e.g., the parameters of Table 8), a set of search space sets monitored by the UE may change each time. For example, when search space set #1 is configured with an X-time slot period, search space set #2 is configured with a Y-time slot period, and X and Y are different from each other, the UE may monitor both search space set #1 and search space set #2 in a specific time slot, or may monitor one of search space set #1 and search space set #2 in a specific time slot.

[0168] When multiple search space sets are configured in the UE, the following conditions may be considered in a method of determining a search space set to be monitored by the UE.

[0169] [Condition 1: Restriction on the maximum number of PDCCH candidates]

[0170] The number of PDCCH candidates that can be monitored in each time slot does not exceed M μ . M μ It can be defined as the maximum number of PDCCH candidates per time slot in a cell configured with 15*2 μkHz subcarrier spacing and can be defined as shown in the following table.

[0171] [Table 12]

[0172]

[0173] [Condition 2: Limitation on the maximum number of CCEs]

[0174] The number of CCEs in each time slot that constitute the entire search space does not exceed c μ (Here, the entire search space refers to the entire set of CCEs corresponding to the joint region of the search space set.) μ It can be defined as the maximum number of CCEs per timeslot in a cell configured with 15*2 μkHz subcarrier spacing and can be defined as shown in the following table.

[0175] [Table 13]

[0176] μ <![CDATA[Maximum number of CCEs per time slot and per serving cell (C μ )]]> 0 56 1 56 2 48 3 32

[0177] For convenience of description, a case where condition 1 and condition 2 are satisfied at a specific time is defined as “condition A.” Therefore, not satisfying condition A may mean that at least one of condition 1 or condition 2 is not satisfied.

[0178] According to the configuration of the search space set of the base station, condition A may not be satisfied at a specific time. When condition A is not satisfied at a specific time, the UE may select and monitor only a portion of the search space set configured to satisfy condition A at the corresponding time, and the base station may use the selected search space set to transmit the PDCCH.

[0179] As a method of selecting some search spaces from the entire set of configured search spaces, the following method may be followed.

[0180] [Method 1]

[0181] When condition A is not met for PDCCH at a specific time (time slot), the UE (or base station) may give priority to a search space set, wherein the search space type is configured as a common search space in the search space set existing at the corresponding time, rather than (over) a search space set configured as a UE-specific search space.

[0182] When all search space sets configured as common search spaces are selected (i.e., when condition A is satisfied even if all search spaces configured as common search spaces are selected), the UE (or base station) may select a search space set configured as a UE-specific search space. In this case, when there are multiple search space sets configured as UE-specific search spaces, a search space set with a lower search space set index may have a higher priority. By considering the priority, a UE-specific search space set may be selected within a range that satisfies condition A.

[0183] Figure 6 A diagram for describing discontinuous reception (DRX) is shown.

[0184] DRX is an operation in which a UE using a service receives data discontinuously in an RRC connection state in which a radio link is established between a base station and the UE. When DRX is applied, the UE turns on the receiver at a specific time to monitor a control channel, and turns off the receiver when no data is received during a specific period, so that the power consumption of the UE can be reduced. The DRX operation can be controlled by the media access control (MAC) layer based on various parameters and timers.

[0185] refer to Figure 6 , the activation time 605 is the time when the UE wakes up and monitors the PDCCH in each DRX cycle. The activation time 605 can be defined as follows:

[0186] - drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running; or

[0187] - a scheduling request is sent on the PUCCH and is pending; or

[0188] - after successfully receiving a random access response to a random access preamble that was not selected by the MAC entity in a contention-based random access preamble, no PDCCH indicating a new transmission of the C-RNTI addressed to the MAC entity is received

[0189] drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer, etc. are timers whose values ​​are configured by the base station and have the function of configuring the UE to monitor the PDCCH when specific conditions are met.

[0190] drx-onDurationTimer 615 is a parameter for configuring the minimum time that the UE wakes up in the DRX cycle. drx-InactivityTimer 620 is a parameter for additionally configuring the wake-up time when the UE receives a PDCCH (630) indicating a new UL transmission or DL ​​transmission. drx-RetransmissionTimerDL is a parameter for configuring the maximum time that the UE wakes up in the DL HARQ process to receive a DL retransmission. drx-RetransmissionTimerUL is a parameter for configuring the maximum time that the UE wakes up in the UL HARQ process to receive a UL retransmission grant. drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL and drx-RetransmissionTimerUL can be configured as, for example, time, number of subframes, number of time slots, etc. ra-ContentionResolutionTimer is a parameter for monitoring PDCCH in the random access process.

[0191] The inActive time 610 is a time configured not to monitor the PDCCH during the DRX operation and / or a time configured not to receive the PDCCH, and the remaining time excluding the activation time 605 from the entire time when the DRX operation is performed may become the inActive time 610. When the PDCCH is not monitored during the activation time 605, the UE may enter a sleep or inActive state to reduce power consumption.

[0192] The DRX cycle refers to the period during which the UE wakes up and monitors the PDCCH. That is, the DRX cycle refers to the time interval or on duration after the UE monitors the PDCCH until it monitors the next PDCCH. There are two types of DRX cycles: short DRX cycle and long DRX cycle. The short DRX cycle can be optionally applied.

[0193] The long DRX cycle 625 is a longer cycle between two DRX cycles configured in the UE. When operating in long DRX, the UE starts the drx-onDurationTimer 615 again when the time of the long DRX cycle 625 has passed from the starting point (e.g., the starting symbol) of the drx-onDurationTimer 615. When operating in the long DRX cycle 625, the UE may start the drx-onDurationTimer 615 in a time slot after the drx-SlotOffset in the subframe satisfies the following [Formula 2]. drx-SlotOffset refers to a delay before starting the drx-onDurationTimer 615. drx-SlotOffset may be configured as, for example, time, number of time slots, etc.

[0194] [Formula 2]

[0195] [(SFN x 10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset

[0196] In this case, drx-LongCycleStartOffset may include the long DRX cycle 625 and drx-StartOffset and may be used to define a subframe starting the long DRX cycle 625. drx-LongCycleStartOffset may be configured as, for example, time, a number of subframes, a number of slots, and the like.

[0197] The short DRX cycle is a shorter cycle between two DRX cycles defined in the UE. When a certain event, such as reception of a PDCCH indicating a new UL transmission or DL ​​transmission (630) occurs at the activation time 605 while the UE is operating in the long DRX cycle 625, the UE starts or restarts the drx-InactivityTimer 620, and when the drx-InactivityTimer 620 expires or a DRX command MAC control element (CE) is received, the UE may operate in the short DRX cycle. For example, in Figure 6 In the case of a short DRX cycle, the UE may start the drx-ShortCycleTimer when the previous drx-onDurationTimer 615 or drx-InactivityTimer 620 expires, and may operate in the short DRX cycle until the drx-ShortCycleTimer expires. When the UE receives a PDCCH (630) indicating a new UL transmission or DL ​​transmission, the UE may anticipate future additional UL transmissions or DL ​​transmissions, and may extend the Activation Time 605 or delay the arrival of the InActive Time 610. When operating in short DRX, the UE starts the drx-onDurationTimer 615 again when the time of the short DRX cycle has passed from the starting point of the previous on-duration. Subsequently, when the drx-ShortCycleTimer expires, the UE operates in the long DRX cycle 625 again.

[0198] When operating in a short DRX cycle, the UE may start the drx-onDurationTimer 615 after the drx-SlotOffset in a subframe satisfies the following [Equation 3]. drx-SlotOffset refers to a delay before starting the drx-onDurationTimer 615. drx-SlotOffset may be configured as, for example, time, number of slots, etc.

[0199] [Formula 3]

[0200] [(SFN Y 10) + subframe number] modulo (drx-ShortCycle) = (drx-StartOffset) modulo (drx-ShortCycle)

[0201] drx-ShortCycle and drx-StartOffset can be used to define the subframe that starts the short DRX cycle. drx-ShortCycle and drx-StartOffset can be configured as, for example, time, number of subframes, number of time slots, etc.

[0202] Already referenced Figure 6DRX operation is described. According to an embodiment of the present disclosure, the UE can reduce the power consumption of the UE by performing the DRX operation. However, even when the UE performs the DRX operation, the UE does not always receive the PDCCH associated with the UE at the activation time 605. Therefore, in an embodiment of the present disclosure, a signal for controlling the UE operation can be provided to more effectively save the power of the UE.

[0203] Hereinafter, carrier aggregation and scheduling methods in 5G communication systems will be described in detail.

[0204] The UE can be configured with multiple cells (cells or component carriers (CCs)) from the base station, and can be configured whether to perform cross-carrier scheduling for the cells configured in the UE. When cross-carrier scheduling is configured for a specific cell (cell A or scheduled cell), PDCCH monitoring for cell A may not be performed in cell A, but may be performed in other cells (cell B or scheduling cells) indicated by cross-carrier scheduling. At this time, the scheduled cell (cell A) and the scheduling cell (cell B) may be configured by different parameter sets. The parameter set may include subcarrier spacing, cyclic prefix, etc. When the parameter sets of cell A and cell B are different from each other, when the PDCCH of cell B schedules the PDSCH of cell A, the following minimum scheduling offset may be additionally considered between the PDCCH and the PDSCH.

[0205] [Cross-carrier scheduling method]

[0206] -When the subcarrier spacing (μ B ) is smaller than the subcarrier spacing (μ A ), the PDSCH may be scheduled starting from the next PDSCH slot corresponding to X symbols after the last symbol of the PDCCH received in cell B. X may be based on μ B When μ B =15kHz, X=4 symbols can be defined. B =30kHz, X = 4 symbols can be defined, and when μ B =60kHz, X=8 symbols can be defined.

[0207] -When the subcarrier spacing (μ B ) is greater than the subcarrier spacing (μ A ), the PDSCH may be scheduled starting from a time corresponding to X symbols after the last symbol of the PDCCH received in cell B. X may be based on μ B When μ B =30kHz, X = 4 symbols can be defined. When μ B = 60kHz, X = 8 symbols can be defined, and when μ B=120kHz, X=12 symbols can be defined.

[0208] Hereinafter, the high-layer signaling may be signaling corresponding to at least one of the following signalings or a combination of one or more of the following signalings.

[0209] -MIB (Master Information Block)

[0210] - SIB (System Information Block) or SIB X (X = 1, 2, ...)

[0211] -RRC (Radio Resource Control)

[0212] -MAC (Media Access Control) CE (Control Element)

[0213] -UE Capability Report

[0214] In addition, L1 signaling may be signaling corresponding to at least one of the following physical layer channels or signaling methods or a combination of one or more of the following physical layer channels or signaling methods.

[0215] -PDCCH (Physical Downlink Control Channel)

[0216] -DCI (Downlink Control Information)

[0217] -UE-specific DCI

[0218] -Group Common DCI

[0219] - Public DCI

[0220] --Scheduling DCI (e.g., DCI for scheduling DL or UL data)

[0221] -- Non-scheduled DCI (e.g., DCI not used for scheduling DL or UL data)

[0222] -PUCCH (Physical Uplink Control Channel)

[0223] -UCI (Uplink Control Information)

[0224] <First Embodiment>

[0225] In the next generation mobile communication system, the base station may transmit an L1 signal to the UE to reduce the power consumption of the UE. This may be referred to as a power saving signal (POSS). POSS is not limited to the above examples and may be represented by various names such as a power control signal and a power setting signal. More particularly, in an embodiment of the present disclosure, POSS may be referred to as a wake-up signal (WUS), a power control signal, a DRX activation signal, an on-duration activation signal, an on-duration timer activation signal (drx-onDurationTimer activation signal), etc.

[0226] According to an embodiment of the present disclosure, the UE may monitor the PDCCH and detect the DCI corresponding to the monitored POSS. The DCI format corresponding to the POSS may be referred to as DCI format 3_0. At this time, the CRC of the DCI format 3_0 may be scrambled by a specific RNTI. The specific RNTI may be referred to as, for example, PS (power saving)-RNTI. In the present disclosure, "PS" may refer to power saving. In addition, the PS-RNTI may be a newly defined RNTI or an existing RNTI. Alternatively, the UE may be configured with the PS-RNTI from the base station via high-layer signaling. The UE may receive the DCI format 3_0 under the assumption that the DCI format 3_0 corresponding to the POSS is scrambled by the PS-RNTI. In this case, when the UE performs blind decoding on the DCI format 3_0, the UE may perform descrambling by using the PS-RNTI.

[0227] According to an embodiment of the present disclosure, the UE may be configured with a search space to monitor the DCI format 3_0 corresponding to the POSS from the base station through high-layer signaling. The base station may configure the search space of the DCI format 3_0 corresponding to the POSS in the UE based on the parameters of [Table 10] above. In general, the following information may be configured.

[0228] [Search space configuration information]

[0229] -Search space ID

[0230] -CORESET ID

[0231] -monitoringSlotPeriodicityAndOffset (slot-level monitoring period and offset)

[0232] - Duration (MonitoringDuration): The number of consecutive slots that the SearchSpace lasts at each opportunity (i.e., on each period given in PeriodicityAndOffset). If this field is not present, the UE applies a value of 1 slot, except for DCI format 2_0. For DCI format 2_0, the UE ignores this field. The maximum valid duration is period - 1 (the period given in monitoringSlotPeriodicityAndOffset).

[0233] -monitoringSymbolsWithinSlot (monitoring timing symbols within the time slot)

[0234] -nrofCandidates (number of PDCCH candidates per aggregation level)

[0235] -searchSpaceType (search space type)

[0236] --common (common search space)

[0237] --ue-Specific (UE-specific search space)

[0238] According to an embodiment of the present disclosure, the UE may determine the PDCCH monitoring opportunity of the POSS based on the search space configuration information of the DCI format 3_0 corresponding to the POSS received from the base station. The UE may perform blind decoding on each PDCCH monitoring opportunity of the POSS. When the UE detects the DCI format 3_0, the UE may perform subsequent operations according to the indication information in the detected DCI format 3_0. For example, the following control information may be included in the DCI format 3_0.

[0239] - First control information: an indicator for controlling the PDCCH monitoring operation in a DRX opportunity occurring after the POSS monitoring opportunity (or it may be represented by an indicator indicating whether to wake up, a ps-Index, etc.).

[0240] --As an example, when the value of this field indicates "0", the UE may not perform PDCCH monitoring during the subsequent DRX activation time. (Alternatively, the UE may not start the drx-onDurationTimer during the subsequent DRX timing. The above operation corresponding to the field value "0" may correspond to the operation of the UE not waking up.)

[0241] --As an example, when the value of this field indicates "1", the UE may perform PDCCH monitoring during the subsequent DRX activation time. (Alternatively, the UE may start the drx-onDurationTimer during the subsequent DRX timing. The above operation corresponding to the field value "1" may correspond to the operation of UE waking up.)

[0242] - Second control information: an indicator indicating the dormant state or active state of the secondary cell (SCell)

[0243] --The second control information may include an N-bit bitmap, and each bit in the bitmap may correspond to one secondary cell or one secondary cell group including a plurality of secondary cells.

[0244] --As an example, when "0" is indicated as a bit value in the bitmap, the UE may configure the cell state as the dormant state of the secondary cell indicated by the corresponding bit or all secondary cells of the secondary cell group indicated by the corresponding bit.

[0245] --As an example, when "1" is indicated as a bit value in the bitmap, the UE may configure the cell state as an activation state of a secondary cell indicated by a corresponding bit or all secondary cells of a secondary cell group indicated by a corresponding bit.

[0246] - Third control information: indicator triggering aperiodic CSI reporting

[0247] According to an embodiment of the present disclosure, the UE may monitor the DCI format corresponding to the POSS only in an area outside the DRX activation time. More specifically, when the PDCCH monitoring opportunity of the POSS configured in the UE appears in a time domain outside the DRX activation time, the UE may determine that the corresponding PDCCH monitoring opportunity is valid, and may perform PDCCH monitoring of the POSS at the corresponding opportunity. When the PDCCH monitoring opportunity of the POSS configured in the UE appears in a time domain corresponding to the DRX activation time, the UE may determine that the corresponding PDCCH monitoring opportunity is invalid, and may not perform PDCCH monitoring of the POSS at the corresponding opportunity.

[0248] In an embodiment of the present disclosure, the UE may determine that the PDCCH monitoring opportunity of the POSS is invalid under the following circumstances.

[0249] - The configured POSS PDCCH monitoring timing occurs within the DRX activation time

[0250] - A situation where there is contention with other operations or physical channels of the UE (or physical channels with higher priority or operations related thereto) at the time corresponding to the PDCCH monitoring opportunity of the configured POSS (e.g., when there are overlapping SS / PBCH blocks or overlapping periodic / semi-persistently transmitted or received reference signals (e.g., periodic / semi-persistent CSI-RS / SRS, etc.)

[0251] - The case where a signaling to cancel the PDCCH monitoring operation is received at the configured POSS PDCCH monitoring opportunity

[0252] According to an embodiment of the present disclosure, when the UE does not detect DCI format 3_0 at the PDCCH monitoring opportunity of the configured POSS, the following operations may be performed.

[0253] -When the UE has been configured with a fallback operation (or ps-fallback) from the base station through higher layer signaling, the UE may perform an operation according to the configuration of the base station. For the case where DCI format 3_0 is not received, the base station may configure one of the following two operations in the UE as a fallback operation.

[0254] --Operation 1: monitor the PDCCH detected in the subsequent DRX activation time.

[0255] --Operation 2: Do not monitor the PDCCH during the subsequent DRX activation time.

[0256] -When the UE is not configured with fallback operation from the base station through higher layer signaling, the UE may not perform PDCCH monitoring in the subsequent DRX activation time.

[0257] According to an embodiment of the present disclosure, the UE may be configured to monitor the POSS in a primary cell (PCell) or a primary secondary cell (PSCell), and may monitor the POSS based on configuration information. All or part of the content indicated by the POSS may be equally applied to all secondary cells of the cell group to which the PCell (or PSCell) belongs (i.e., the primary cell group (MCG) in the case of the PCell and the secondary cell group (SCG) in the case of the PSCell). For example, when the UE monitors the POSS in the PCell and receives an indicator indicating wake-up through the received POSS, the UE may perform a wake-up operation on all primary cells and secondary cells present in the MCG, and when the UE receives an indicator indicating not to wake up, the UE may not perform a wake-up operation on all primary cells and secondary cells present in the MCG. In addition, when the UE monitors the POSS in the PSCell and receives an indicator indicating wake-up through the received POSS, the UE may perform a wake-up operation on all primary secondary cells and secondary cells present in the SCG, and when the UE receives an indicator indicating not to wake up, the UE may not perform a wake-up operation on all primary secondary cells and secondary cells present in the SCG.

[0258] After the DCI format is detected by performing POSS monitoring, the UE can perform subsequent operations according to the indication information in the received DCI format. At this point, the time required for the decoding operation of the PDCCH corresponding to the POSS of the UE and the time to prepare or preheat to perform PDCCH monitoring within the subsequent DRX activation time according to the indication content of the DCI may be required. Taking this into account, the POSS monitoring opportunity can be configured to be located at a specific time interval before the DRX opening or activation time (or, in the same way, before the UE starts drx-onDurationTimer). That is to say, the PDCCH monitoring opportunity of POSS can be configured to appear before the specific offset of the start time of each DRX opportunity determined by the DRX cycle. Figure 7 The example of φ shows that the position of the PDCCH monitoring opportunity of POSS has an offset difference of the gap 706 before DRX is turned on.

[0259] Hereinafter, various methods of determining or configuring a PDCCH monitoring opportunity of DCI format 3_0 corresponding to POSS are proposed.

[0260] <Example (1-1)>

[0261] Figure 7 A diagram illustrating an example of a method of configuring a PDCCH monitoring opportunity of a DCI format 3_0 corresponding to a POSS according to the (1-1)th embodiment of the present disclosure is shown.

[0262] In some embodiments of the present disclosure, the UE may be configured with a search space of the POSS (i.e., a search space of the DCI format 3_0 corresponding to the POSS) from the base station through high-layer signaling. The UE may receive the search space configuration information described in the first embodiment of the present disclosure from the base station. For example, the UE may receive configuration information such as the monitoring duration 704, the slot-level monitoring period 705, and the offset (monitoringSlotPeriodicityAndOffset).

[0263] The UE may determine, based on the search space configuration information of the POSS, that there is a PDCCH monitoring opportunity for the POSS in each consecutive time slot corresponding to the configured monitoring duration 704 of each configured period 705. For example, when X time slots, Y time slots, and Z time slots are configured as the period 705, the offset, and the duration 704, respectively, through the monitoringSlotPeriodicityAndOffset value, the UE may determine that starting from the Yth time slot of the time interval that exists in each X time slot period, there are a total of Z time slots (i.e., {Y, Y+1, Y+2, ..., Y+Z-1}th time slots) for the PDCCH monitoring opportunity.

[0264] In some embodiments of the present disclosure, the UE may be configured with a ps-offset value (ps-Offset) 702 from the base station through high-layer signaling, which corresponds to an offset from the start time of the DRX activation time 707 (or the DRX on start time) to the start time of the PDCCH monitoring opportunity of the POSS. That is, the UE may determine that the PDCCH monitoring opportunity of the POSS starts from a time earlier than the start time of the DRX activation time 707 by the ps-offset value 702. The UE may determine that the PDCCH monitoring opportunity exists as many time slots as are configured as the monitoring duration 704 starting from the start time of the PDCCH monitoring opportunity of the POSS.

[0265] In some embodiments of the present disclosure, the start time (or start time slot) of the PDCCH monitoring opportunity of the POSS may be determined by the ps-offset value 702, may be determined by the offset value configured by monitoringSlotPeriodicityAndOffset in the search space configuration, or may be determined by both the ps-offset value 702 and the offset value configured by monitoringSlotPeriodicityAndOffset. For example, the start time of the PDCCH monitoring opportunity of the POSS may be determined by at least one of the following methods or a combination of one or more of the following methods.

[0266] -[Method 1] When the ps-offset value 702 is configured and monitoringSlotPeriodicityAndOffset is configured, the UE may ignore the value of monitoringSlotPeriodicityAndOffset and determine the start time of the PDCCH monitoring opportunity of the POSS by using the ps-offset value 702.

[0267] - [Method 2] When the ps-offset value 702 is configured but the monitoringSlotPeriodicityAndOffset is not configured, the UE may determine the start time of the PDCCH monitoring opportunity of the POSS by using the ps-offset value 702.

[0268] -[Method 3] When the ps-offset value 702 is not configured but monitoringSlotPeriodicityAndOffset is configured, the UE may determine the start time of the PDCCH monitoring opportunity of the POSS by using the offset value indicated by monitoringSlotPeriodicityAndOffset.

[0269] -[Method 4] When the ps-offset value 702 is configured and monitoringSlotPeriodicityAndOffset is configured, unlike [Method 1], the UE can determine the start time of the PDCCH monitoring opportunity of the POSS by combining the ps-offset value 702 and the offset value indicated by monitoringSlotPeriodicityAndOffset. For example, the UE can first determine the PDCCH monitoring opportunity of the search space of the POSS by using the offset value indicated by monitoringSlotPeriodicityAndOffset. Next, the UE can determine the PDCCH monitoring opportunity that appears at the closest, earliest, or latest time among the determined PDCCH monitoring opportunities that exist after the time indicated by the ps-offset value 702 as the start time.

[0270] In some embodiments of the present disclosure, the UE may be configured with one or more search spaces of the POSS from the base station through high-layer signaling, and may be configured with each ps-offset value 702 applied to each search space respectively. For example, the UE may be configured with search space X and search space Y of the POSS, and may be configured with offset value X to be applied to search space X and offset value Y to be applied to search space Y. Therefore, the UE may determine the start time of the PDCCH monitoring opportunity of the POSS of each search space set based on the offset value configured for each search space set.

[0271] In some embodiments of the present disclosure, the UE may be configured with one or more search spaces of the POSS from the base station through high-layer signaling, and may be configured with a ps-offset value 702 to be applied to all configured search spaces. For example, the UE may be configured with a search space X and a search space Y of the POSS, and may be configured with an offset value Z. The UE may determine the start time of the PDCCH monitoring opportunity of the POSS by applying the offset value Z to the search space X and the search space Y. At this time, the start times of the PDCCH monitoring opportunities in the search space X and the search space Y may be equal to each other (by applying, for example, the above-mentioned [method 1] or [method 2]) or different from each other (by applying, for example, the above-mentioned [method 3] or [method 4]).

[0272] In some embodiments of the present disclosure, when the following "condition B" is met, the UE may consider that the monitoring period 705 of the search space of the POSS is equal to the DRX long cycle (drx-LongCycle) 701 configured in the UE. At this time, when the UE is configured with the period value of the search space through other configuration parameters (e.g., monitoringSlotPeriodicityAndOffset), the UE may ignore all or part of the configuration information indicated by monitoringSlotPeriodicityAndOffset. For example, the UE may ignore one or both of the time slot period information and the time slot offset information in the configuration information bar indicated by monitoringSlotPeriodicityAndOffset. At this time, when the unit of the DRX long cycle configured in the UE is inconsistent with the unit of the search space monitoring period, the UE may convert the value into a reference unit. For example, when X ms is configured as the DRX long cycle in the UE, the UE may convert X ms into Y time slots, i.e., the search space monitoring period in units of time slots. For example, Y may be determined as Y=X*2μ(time slot) (μ is a parameter of the subcarrier spacing of the PDCCH and may be defined as μ=0, 1, 2, 3 for 15, 30, 60, and 120 kHz, respectively). The UE may use the value of the DRX long cycle in which the unit is converted into a time slot as the monitoring period 705 of the POSS. When "Condition B" is not satisfied, the UE may determine the monitoring period 705 of the search space of the POSS by using the original parameter monitoringSlotPeriodicityAndOffset. "Condition B" may be at least one of the following conditions or a combination of one or more of the following conditions.

[0273] - When ps-offset 702 is configured

[0274] - When monitoringSlotPeriodicityAndOffset is not configured

[0275] - When ps-offset 702 is configured but monitoringSlotPeriodicityAndOffset is not configured

[0276] - When information having a power saving mode or the same or similar effect is configured

[0277] The UE may determine the PDCCH monitoring timing of the POSS according to the (1-1) embodiment of the present disclosure, and may perform subsequent operations based on the indication content of the DCI format detected after the POSS monitoring.

[0278] Figure 8 A diagram illustrating an example of a method of configuring a PDCCH monitoring opportunity of DCI format 3_0 corresponding to POSS according to the (1-2) embodiment and the (1-3) embodiment of the present disclosure is shown. The (1-2) embodiment is described first, and then the (1-3) embodiment is described.

[0279] <Example (1-2)>

[0280] See also Figure 8 In some embodiments of the present disclosure, the UE may be configured with the search space of the POSS (i.e., the search space of the DCI format 3_0 corresponding to the POSS) from the base station through high-layer signaling. The UE may receive the search space configuration information described in the first embodiment of the present disclosure from the base station. For example, the UE may receive configuration information such as the monitoring duration 804, the slot-level monitoring period 805, and the offset (monitoringSlotPeriodicityAndOffset).

[0281] In some embodiments of the present disclosure, the UE may be configured by the base station through high-layer signaling with a ps-offset value 802 corresponding to an offset from the start time of the DRX activation time 807 (or the DRX on start time) to the start time of the PDCCH monitoring opportunity of the POSS. That is, the UE may determine that the PDCCH monitoring opportunity of the POSS starts from a time earlier than the start time of the DRX activation time 807 by a ps-offset value 802.

[0282] In some embodiments of the present disclosure, the UE may interpret the monitoring duration 804 differently according to a specific condition (referred to as "condition C"). "Condition C" may be at least one of the following conditions or a combination of one or more of the following conditions.

[0283] - When ps-offset 802 is configured

[0284] - When information having a power saving mode or the same or similar effect is configured

[0285] When condition C is not met, the UE may interpret and apply the monitoring duration 804 currently in use, i.e., as described in the duration of the search space configuration information described above. For example, when X time slots, Y time slots, and Z time slots are configured as period 705, offset, and duration, respectively, by the monitoringSlotPeriodicityAndOffset value, the UE may determine that there are a total of Z time slots (i.e., {Y, Y+1, Y+2, ..., Y+Z-1} time slots) for PDCCH monitoring opportunities starting from the Yth time slot of the time interval that exists for every X time slot period. At this time, the value Z that may be configured as the duration may not be configured to be equal to or greater than the time slot period X configured by monitoringSlotPeriodicityAndOffset.

[0286] When condition C is met, the UE may interpret and apply the monitoring duration 804 as a time interval for the UE to monitor the PDCCH. For example, the UE may determine the start time of the PDCCH monitoring opportunity of the POSS from the ps-offset value 802 configured by the base station, may determine that the PDCCH monitoring opportunities existing in the time interval corresponding to the duration 804 starting from the start time are valid, and may determine that the PDCCH monitoring opportunities existing in the remaining time interval are invalid. Figure 8 A valid POSS monitoring opportunity 808 and an invalid POSS monitoring opportunity 809 are shown. The UE may perform PDCCH monitoring only for the PDCCH monitoring opportunity of the valid POSS. At this time, the value Z configurable as the duration may be configured to be equal to or greater than the slot period X configured by monitoringSlotPeriodicityAndOffset.

[0287] The UE may determine the PDCCH monitoring timing of the POSS according to the (1-2) embodiment of the present disclosure, and may perform subsequent operations based on the indication content of the DCI format detected after the POSS monitoring.

[0288] <Example (1-3)>

[0289] In some embodiments of the present disclosure, the UE may be configured with a search space of the POSS (i.e., a search space of the DCI format 3_0 corresponding to the POSS) from the base station through high-layer signaling. The UE may receive the search space configuration information described in the first embodiment of the present disclosure from the base station. For example, the UE may receive configuration information such as the monitoring duration 804, the slot-level monitoring period 805, and the offset (monitoringSlotPeriodicityAndOffset).

[0290] In some embodiments of the present disclosure, the UE may be configured with a ps-offset value 802 from the base station through high-layer signaling, which corresponds to an offset from the start time of the DRX activation time 807 (or the DRX on start time) to the start time of the PDCCH monitoring opportunity of the POSS. The UE may determine that the PDCCH monitoring opportunity existing in the time interval between the time earlier than the start time of the DRX activation time 807 by the ps-offset value 802 and the time earlier than the start time of the DRX activation time 807 by the gap 806 is valid, and may determine that the PDCCH monitoring opportunity existing in the remaining time interval is invalid. Figure 8 808 and an invalid POSS monitoring opportunity 809 are shown. Figure 8 In the example, the UE may determine that only the PDCCH monitoring opportunities that exist within the time interval corresponding to the monitoring duration 804 are valid. At this time, the gap 806 may be determined based on the capability reported by the UE to the base station.

[0291] Furthermore, the present disclosure can be implemented by a combination of the above-mentioned first embodiment, (1-1) embodiment, (1-2) embodiment, and (1-3) embodiment.

[0292] <Second Embodiment>

[0293] According to an embodiment of the present disclosure, the UE may receive an indicator indicating the dormant state or activation state of the secondary cell from the base station through L1 signaling. When the secondary cell is in the dormant state, the UE may not perform PDCCH monitoring on the secondary cell (or may perform PDCCH monitoring intermittently), and may continuously perform CSI measurement, adaptive gain control (AGC), beam management, etc.

[0294] According to an embodiment of the present disclosure, the UE may receive an indicator indicating a dormant state or an activated state of a secondary cell from a base station through the POSS. More specifically, the following control information may be included in a DCI format (eg, DCI format 3_0) corresponding to the POSS.

[0295] - First control information: an indicator for controlling the PDCCH monitoring operation in a DRX opportunity occurring after the POSS monitoring opportunity (or it may be represented by an indicator indicating whether to wake up, a ps-Index, etc.).

[0296] --As an example, when the value of this field indicates "0", the UE may not perform PDCCH monitoring during the subsequent DRX activation time. (Alternatively, the UE may not start the drx-onDurationTimer during the subsequent DRX timing. The above operation corresponding to the field value "0" may correspond to the operation of the UE not waking up.)

[0297] --As an example, when the value of this field indicates "1", the UE may perform PDCCH monitoring during the subsequent DRX activation time. (Alternatively, the UE may start the drx-onDurationTimer during the subsequent DRX timing. The above operation corresponding to the field value "1" may correspond to the operation of UE waking up.)

[0298] - Second control information: an indicator indicating the dormant state or active state of the secondary cell (SCell)

[0299] --The second control information may include an N-bit bitmap, and each bit in the bitmap may correspond to one secondary cell or one secondary cell group including a plurality of secondary cells.

[0300] --As an example, when "0" is indicated as a bit value in the bitmap, the UE may configure the cell state as the dormant state of the secondary cell indicated by the corresponding bit or all secondary cells of the secondary cell group indicated by the corresponding bit.

[0301] --As an example, when "1" is indicated as a bit value in the bitmap, the UE may configure the cell state as an activation state of a secondary cell indicated by a corresponding bit or all secondary cells of a secondary cell group indicated by a corresponding bit.

[0302] - Third control information: indicator triggering aperiodic CSI reporting

[0303] According to an embodiment of the present disclosure, the UE may be configured to monitor the POSS in a primary cell (PCell) or a primary secondary cell (PSCell), and may monitor the POSS based on configuration information. All or part of the content indicated by the POSS may be equally applied to all secondary cells of the cell group to which the PCell (or PSCell) belongs (i.e., the primary cell group (MCG) in the case of the PCell and the secondary cell group (SCG) in the case of the PSCell). For example, when the UE monitors the POSS in the PCell and receives an indicator indicating wake-up through the received POSS, the UE may perform a wake-up operation on all primary cells and secondary cells present in the MCG, and when the UE receives an indicator indicating not to wake up, the UE may not perform a wake-up operation on all primary cells and secondary cells present in the MCG. In addition, when the UE monitors the POSS in the PSCell and receives an indicator indicating wake-up through the received POSS, the UE may perform a wake-up operation on all primary secondary cells and secondary cells present in the SCG, and when the UE receives an indicator indicating not to wake up, the UE may not perform a wake-up operation on all primary secondary cells and secondary cells present in the SCG.

[0304] As described above, the UE can receive an indicator indicating whether to wake up ("first control information") and an indicator indicating the sleep state of the secondary cell ("second control information") through the DCI format corresponding to the POSS. At this time, the indicator indicating whether to wake up and the indicator indicating the sleep state of the secondary cell both correspond to the indicator for controlling the PDCCH monitoring operation of the UE. Therefore, the operation of the UE can be controlled according to a specific combination of information pieces indicated by the first control information and the second control information. The operation of the UE according to the combination of the content of each field in the POSSDCI format is specifically proposed below.

[0305] 1) First control information: wake-up indication, second control information: indicating the cell or cell group in the activated state

[0306] - The UE may perform a state change to an active state for the secondary cell indicated as the active state.

[0307] -The UE may perform a wake-up operation (ie, perform an operation of PDCCH monitoring or start a drx-onDurationTimer in a subsequent DRX activation time) on a cell indicated as being in an activated state among cells in the cell group to which the primary cell receiving the POSS belongs.

[0308] 2) First control information: wake-up indication, second control information: indicating the cell or cell group in sleep state

[0309] - The UE may perform a state change to the dormant state for the secondary cell indicated as the dormant state.

[0310] - The UE may perform an operation corresponding to at least one of the following operations on a cell indicated as being in a dormant state among cells in a cell group to which a primary cell receiving the POSS belongs.

[0311] --Operation 1) For a cell indicated as dormant, the UE may consider that the drx-onDurationTimer has been started and the MAC entity still corresponds to the DRX activation time. At this time, the UE may not perform PDCCH monitoring within the corresponding DRX activation time, but may perform all other operations that the UE must perform within the DRX activation time in the same manner as before (e.g., periodic / semi-permanent CSI reporting operations, periodic / semi-permanent SRS transmission operations, etc.), except for PDCCH monitoring.

[0312] -- Operation 2) For a cell indicated as dormant, the UE may consider that the MAC entity does not correspond to the DRX activation time. Therefore, the UE may not perform PDCCH monitoring, and may not perform all other operations that the UE must perform during the DRX activation time (e.g., periodic / semi-permanent CSI reporting operation, periodic / semi-permanent SRS transmission operation, etc.).

[0313] 3) 1st control information: indication of not waking up, 2nd control information: indication of the cell or cell group in the activated state

[0314] - The UE may perform a state change to an active state for the secondary cell indicated as the active state.

[0315] - The UE may perform an operation corresponding to at least one of the following operations for a cell indicated as being in an activated state among cells of a cell group to which a primary cell receiving the POSS belongs.

[0316] --Operation 1) The UE may not expect that the first control information indicates not waking up and the second control information indicates an activated state. Therefore, when receiving control information of an unexpected combination, the UE may regard the content of the DCI format as an error and operate according to a predefined basic operation. The basic operation may, for example, correspond to an operation applicable when the UE fails to decode the DCI format corresponding to the POSS (see the operation when the UE does not detect the DCI format 3_0 in the first embodiment of the present disclosure). That is, when the first control information indicates not waking up, the second control information may always indicate a dormant state to all cells. That is, when the first control information indicates not waking up, the UE may expect that the second control information will always indicate a dormant state to all cells.

[0317] -- Operation 2) For a cell indicated as being in an activated state, the UE may consider that the MAC entity does not correspond to the DRX activation time. Therefore, the UE may not perform PDCCH monitoring in the corresponding cell.

[0318] --Operation 3) When there is at least one cell indicated as being in an activated state by the second control information, the UE may start the drx-onDurationTimer. However, the UE may not perform PDCCH monitoring on the primary cell (or primary and secondary cell) receiving the POSS and the cell indicated as being in a dormant state, and may only perform PDCCH monitoring on the cell indicated as being in an activated state. The UE may transmit and receive information to and from the cell indicated as being in an activated state by using a control channel and a data channel. The UE may transmit information to the corresponding activated cell or primary cell (a primary and secondary cell or a secondary cell configured to transmit a PUCCH to it) via the PUCCH.

[0319] --Operation 4) When there is at least one cell indicated as being in an activated state by the second control information, the UE may start the drx-onDurationTimer. The UE may perform PDCCH monitoring on the primary cell (or primary and secondary cell) receiving the POSS and the cell indicated as being in an activated state during the DRX activation time, but may not perform PDCCH monitoring on the cell indicated as being in a dormant state.

[0320] -- Operation 5) When the first control information indicates not to wake up, the second control information may be reinterpreted as other control information. For example, the second control information may be reinterpreted as an indicator for triggering a channel status report or SRS transmission. More specifically, the second control information may be reinterpreted as the following.

[0321] ---The second control information is reinterpreted as the (2-1) control information indicating the following content.

[0322] ---(2-1)th control information may include a bitmap including N bits, and each bit in the bitmap may correspond to one secondary cell or one secondary cell group including a plurality of secondary cells.

[0323] ---As an example, when "0" is indicated as one bit value of the bitmap, the UE may not perform channel state reporting or SRS transmission on the secondary cell indicated by the corresponding bit or all secondary cells of the secondary cell group indicated by the corresponding bit.

[0324] ---As an example, when "1" is indicated as one bit value of the bitmap, the UE may perform channel state reporting or SRS transmission on a secondary cell indicated by the corresponding bit or all secondary cells of a secondary cell group indicated by the corresponding bit.

[0325] Parameters for channel state reporting or SRS transmission may be preconfigured through higher layer signaling, and channel state reporting may be performed through a preset PUCCH or PUSCH.

[0326] In addition, when the first control information indicates not to wake up, the UE may perform a state change to a dormant state for all secondary cells of the cell group.

[0327] 4) 1st control information: indication of not waking up, 2nd control information: indication of a cell or cell group in dormant state

[0328] - The UE may perform a state change to the dormant state for the secondary cell indicated as the dormant state.

[0329] -The UE may not perform a wake-up operation (ie, an operation of performing PDCCH monitoring or starting a drx-onDurationTimer in a subsequently occurring DRX activation time) for a cell indicated as being in a dormant state among cells in a cell group to which a primary cell receiving the POSS belongs.

[0330] According to an embodiment of the present disclosure, which of the above operations of the UE is to be performed can be pre-set. That is, the base station can pre-configure which of the above operations is to be performed on the UE through high-layer signaling, and the UE can control subsequent operations based on the configuration information of the base station.

[0331] According to an embodiment of the present disclosure, the above-mentioned operation of the UE may be different according to the UE capability. That is, the UE may report the capability to the base station about the operation that can be performed by the UE, and the base station may appropriately control the operation of the UE based on the content of the capability report received from the UE.

[0332] <Example (2-1)>

[0333] According to an embodiment of the present disclosure, when the UE performs blind decoding on the DCI format 3_0 corresponding to the POSS in the PDCCH monitoring opportunity of the configured POSS but does not detect the DCI format 3_0, or when the DCI format 3_0 is not detected because the PDCCH monitoring opportunity of the POSS configured in the UE is invalid, the UE may perform the following operations.

[0334] -When the UE has been configured with a fallback operation (or ps-fallback) from the base station through higher layer signaling, the UE may perform an operation according to the configuration of the base station. For the case where DCI format 3_0 is not received, the base station may configure one of the following two operations as a fallback operation in the UE.

[0335] --Operation 1: Monitor the PDCCH during the subsequent DRX activation time.

[0336] --Operation 2: Do not monitor the PDCCH during the subsequent DRX activation time.

[0337] -When the UE is not configured with fallback operation from the base station through higher layer signaling, the UE may not perform PDCCH monitoring in the subsequent DRX activation time.

[0338] According to an embodiment of the present disclosure, although the UE performs blind decoding on the DCI in the PDCCH monitoring opportunity in which the DCI format including the indicator indicating the dormant state or activation state of the secondary cell can be transmitted from the base station, the UE may not detect the DCI, or the UE may not detect the DCI format 3_0 because the PDCCH monitoring opportunity of the POSS configured in the UE is invalid. In this case, it is necessary to define a fallback operation in which the UE determines the dormant state or activation state of the secondary cell. In this regard, specific embodiments of the present disclosure are proposed below.

[0339] <Example (2-1-1)>

[0340] In the (2-1-1) embodiment of the present disclosure, when the UE fails to detect a DCI format indicating whether a secondary cell (or secondary cell group) is in a dormant state or an activated state from the base station, the UE may follow at least one of the following fallback operations or an operation corresponding to a combination of one or more of the following fallback operations.

[0341] - Operation A) The UE may change (one or more) secondary cells to an activated state.

[0342] - Operation B) The UE may change (one or more) secondary cells to a dormant state.

[0343] - Operation C) The UE may be configured with fallback mode operation from the base station through high-layer signaling. For example, the base station may pre-configure the UE to operate in operation A or operation B through high-layer signaling, and the UE may operate in the configured fallback mode. In the case where the UE is configured with operation A, when the UE does not detect a DCI format indicating whether the secondary cell (or secondary cell group) is in a dormant state or an activated state, the UE may change (one or more) secondary cells to an activated state. In the case where the UE is configured with operation B, when the UE does not detect a DCI format indicating whether the secondary cell (or secondary cell group) is in a dormant state or an activated state, the UE may change (one or more) secondary cells to a dormant state. When the UE fails to receive the configuration of the fallback mode, the fallback mode operation of the UE may be fixed to operation A or operation B.

[0344] - Operation D) The UE may maintain the state of the secondary cell(s) to be the same as the most recent state of the secondary cell(s).

[0345] <Example (2-1-2)>

[0346] In the (2-1-2) embodiment of the present disclosure, the fallback operation of the UE can be controlled differently according to the situation of monitoring the DCI format indicating whether the secondary cell (or secondary cell group) is in a dormant or active state at the DRX activation time, the situation of monitoring the DCI format at the DRX inactive time, or according to which DCI format is indicated. For the convenience of description, the following conditions are described in advance.

[0347] [Condition D]

[0348] DCI format indicating whether the cell (or secondary cell group) is in dormant or active state:

[0349] -Corresponding to the DCI format monitored in the area outside the DRX activation time

[0350] - Corresponding to the DCI format indicating whether to monitor PDCCH (the DCI format corresponding to the above-mentioned POSS)

[0351] - corresponds to a DCI format not used for scheduling purposes

[0352] The situation

[0353] [Condition E]

[0354] DCI format indicating whether the cell (or secondary cell group) is in dormant or active state:

[0355] -Corresponds to the DCI format monitored during the DRX activation time

[0356] - Corresponds to a DCI format other than the DCI format indicating whether to monitor the PDCCH (corresponding to the DCI format of the above-mentioned POSS)

[0357] - corresponds to a DCI format used for scheduling purposes (e.g., DCI format 0_1 / 1_1)

[0358] The situation

[0359] The UE may perform a "1st fallback" operation for a case where the UE does not detect a DCI format including an indicator indicating a dormant state or an activated state of a secondary cell that satisfies all or part of [Condition D]. The "1st fallback" operation may follow at least one of the following operations or an operation corresponding to a combination of one or more of the following operations.

[0360] - Operation 1) The UE may determine a "1st fallback" operation based on the configuration information about the fallback operation of the UE for a case where the UE does not detect the DCI format 3_0 corresponding to the POSS. As an example, the following operation may be followed.

[0361] --When the UE is configured with "Operation 1: monitor PDCCH during the subsequent DRX activation time" as the fallback operation for the case where the UE does not receive DCI format 3_0, the UE may perform the operation of changing (one or more) secondary cells to an activated state as the "1st fallback" operation. When the UE is configured with "Operation 2: do not monitor PDCCH during the subsequent DRX activation time" as the fallback operation for the case where the UE does not receive DCI format 3_0, the UE may perform the operation of changing (one or more) secondary cells to a non-activated state as the "1st fallback" operation.

[0362] --When the UE is not configured with a fallback operation for a case where the UE does not receive DCI format 3_0, the UE may perform an operation of changing the corresponding (one or more) secondary cells to an activated state.

[0363] - Operation 2) The UE may follow at least one of operation A, operation B, operation C or operation D of <Example (2-1-1)> as a "first fallback" operation.

[0364] When the UE does not detect a DCI format including an indicator indicating a dormant state or an activated state of a secondary cell that satisfies all or part of [Condition E], the UE may perform a "second fallback" operation. The "second fallback" operation may follow at least one of the following operations or an operation corresponding to a combination of one or more of the following operations.

[0365] - Operation 1) The UE may maintain the state of the secondary cell(s) as the same state as the most recent state of the secondary cell(s).

[0366] - Operation 2) The UE may follow at least one of operation A, operation B or operation C of <Example (2-1-1)> as a "first fallback" operation.

[0367] In addition, the present disclosure can be implemented by a combination of the above-mentioned second embodiment, the (2-1) embodiment, the (2-1-1) embodiment, and the (2-1-2) embodiment. In addition, the present disclosure can be implemented by a combination of the above-mentioned first embodiment, the (1-1) embodiment, the (1-2) embodiment, the (1-3) embodiment, the second embodiment, the (2-1) embodiment, the (2-1-1) embodiment, and the (2-1-2) embodiment.

[0368] Fig. 9 A flow chart of a method for saving power of a UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0369] refer to Fig. 9In operation 910, the base station 901 may transmit POSS configuration information to the UE 902. The base station 901 may configure the WUS monitoring operation by transmitting the POSS configuration information to the UE 902. In an embodiment of the present disclosure, the base station 901 may provide the WUS configuration information to the UE 902 through high-layer signaling. In an embodiment of the present disclosure, the POSS configuration information may include a search space of the POSS, a POSS start offset, and the like.

[0370] In operation 920, the UE 902 may monitor the PDCCH of the POSS based on the POSS configuration information. More specifically, the UE 902 may monitor the PDCCH in a PDCCH monitoring opportunity of the POSS based on the POSS configuration information, which is a specific time interval during which the POSS may be received.

[0371] In operation 930, the UE 902 may receive the POSS (or a DCI format corresponding to the POSS) from the base station 901 through the PDCCH. That is, when monitoring the PDCCH based on the POSS configuration information in operation 920, the UE 902 may detect the DCI format corresponding to the POSS.

[0372] In operation 940, the UE 902 may perform subsequent operations based on the contents indicated in the DCI format corresponding to the received POSS. For example, the UE may perform a PDCCH monitoring operation and a state change operation of a secondary cell at a DRX activation time.

[0373] Fig.10 A flow chart of a method for saving user equipment (UE) power in a wireless communication system according to an embodiment of the present disclosure is shown.

[0374] refer to Fig.10 In operation 1010, the UE may receive high-layer signaling from the base station, which includes a power saving offset (PS-offset) indicating a first start time when the UE starts monitoring a physical downlink channel (PDCCH) for downlink control information (DCI) notifying power saving information outside a discontinuous reception (DRX) activation time before a second start time of a drx-onDuration timer and a parameter indicating a search space. In an embodiment, the parameter indicating the search space may include a monitoring period and a monitoring offset in units of time slots, a monitoring duration in units of time slots, and at least one symbol in a time slot configured for PDCCH monitoring.

[0375] In operation 1020, the UE may identify at least one PDCCH monitoring opportunity of the DCI based on the PS offset and the parameter indicating the search space. In an embodiment, the UE may identify at least one monitoring opportunity in a monitoring time interval located before the second start time and after the first start time in at least one monitoring time interval indicated by the parameter indicating the search space.

[0376] In an embodiment, at least one monitoring time interval indicated by the parameter indicating the search space may include each time interval during the monitoring duration from each time slot determined by a monitoring offset from each first time slot of each time period where a period of the monitoring cycle exists.

[0377] In an embodiment, the UE may identify at least one monitoring opportunity that is located before a predetermined time gap from the second start time.

[0378] In operation 1030 , the UE may monitor DCI at at least one PDCCH monitoring opportunity.

[0379] Fig.11 A transceiver, a memory and a processor of a UE for executing the above-mentioned embodiments of the present disclosure are shown, and Fig.12 The transceiver, memory and processor of the base station for executing the above-mentioned embodiments of the present disclosure are shown. In order to execute the POSS transmission and reception method, the PDCCH monitoring control method and the data transmission and reception operation, the transceiver, memory and processor of the base station and the UE can operate according to the above-mentioned embodiments.

[0380] Fig.11 A block diagram illustrating the internal structure of a UE according to an embodiment of the present disclosure is shown.

[0381] refer to Fig.11 , the UE may include a transceiver 1101, a memory 1102, and a processor 1103. However, the elements of the UE are not limited to the above examples. For example, the UE may include more or fewer elements than the above elements. In addition, the transceiver 1101, the memory 1102, and the processor 1103 may be implemented in the form of a single chip.

[0382] In an embodiment of the present disclosure, the transceiver 1101 can transmit and receive signals with a base station. The signal may include control information and data. To this end, the transceiver 1101 may include an RF transmitter that performs up-conversion and amplification on the frequency of the signal to be transmitted, and an RF receiver that performs low-noise amplification on the received signal and performs down-conversion on the frequency of the received signal. In addition, the transceiver 1101 can receive a signal through a radio channel, output the signal to the processor 1103, and transmit the output signal of the processor 1103 through the radio channel.

[0383] In an embodiment of the present disclosure, the memory 1102 may store programs and data required for the operation of the UE. In addition, the memory 1102 may store control information or data included in the signal transmitted and received by the UE. The memory 1102 may be configured as a storage medium, such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk read-only memory (CD-ROM) and a digital versatile disk (DVD) or a combination of these storage media. In addition, the memory 1102 may include a plurality of memories. According to an embodiment of the present disclosure, the memory 1102 may store a program for performing a power saving operation of the UE.

[0384] In an embodiment of the present disclosure, the processor 1103 may control a series of processes that enable the UE to operate according to the above-mentioned embodiments of the present disclosure. In an embodiment of the present disclosure, the processor 1103 may execute a program stored in the memory 1102 to receive WU configuration information from a base station, monitor PDCCH based on POSS configuration information, receive POSS from a base station via PDCCH, and wake up based on POSS.

[0385] Fig.12 A block diagram illustrating the internal structure of a base station according to an embodiment of the present disclosure is shown.

[0386] refer to Fig.12 , the UE may include a transceiver 1201, a memory 1202, and a processor 1203. However, the elements of the base station are not limited to the above examples. For example, the base station may include more or fewer elements than the above elements. In addition, the transceiver 1201, the memory 1202, and the processor 1203 may be implemented in the form of a single chip.

[0387] In an embodiment of the present disclosure, the transceiver 1201 can transmit and receive signals with the UE. The signal may include control information and data. To this end, the transceiver 1201 may include an RF transmitter that performs up-conversion and amplification on the frequency of the signal to be transmitted, and an RF receiver that performs low-noise amplification on the received signal and performs down-conversion on the frequency of the received signal. In addition, the transceiver 1201 can receive a signal through a radio channel, output the signal to the processor 1203, and transmit the output signal of the processor 1203 through the radio channel.

[0388] In an embodiment of the present disclosure, the memory 1202 may store programs and data required for the operation of the base station. In addition, the memory 1202 may store control information or data included in the signal transmitted and received by the base station. The memory 1202 may be configured as a storage medium such as a ROM, RAM, hard disk, CD-ROM and DVD or a combination of these storage media. In addition, the memory 1202 may include a plurality of memories. According to an embodiment of the present disclosure, the memory 1202 may store a program for performing a power saving operation of the UE.

[0389] In an embodiment of the present disclosure, the processor 1203 may control a series of processes that enable the base station to operate according to the above-mentioned embodiments of the present disclosure. In an embodiment of the present disclosure, the processor 1203 may execute a program stored in the memory 1202 to transmit POSS configuration information to the UE, transmit POSS to the UE via the PDCCH based on the POSS configuration information, and transmit control information to the UE via the PDCCH based on the POSS.

[0390] The method according to the embodiments of the present disclosure described in the claims or the specification of the present disclosure may be implemented as hardware, software, or a combination of hardware and software.

[0391] When implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executable by one or more processors in an electronic device. One or more programs include instructions for causing the electronic device to perform methods according to embodiments of the present disclosure, which are described in the claims or the specification of the present disclosure.

[0392] One or more programs (software modules, software, etc.) may be stored in RAM, non-volatile memory including flash memory, ROM, electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, CD-ROM, DVD, other types of optical storage devices, or magnetic tape cassettes. Alternatively, one or more programs may be stored in a memory provided by a combination of all or part of these devices. In addition, each memory may include multiple configured memories.

[0393] In addition, one or more programs can be stored in an attachable storage device that can be accessed through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or a communication network provided by a combination thereof. These storage devices can be connected to the equipment that performs the embodiments of the present disclosure through external ports. In addition, a separate storage device on the communication network can access the equipment that performs the embodiments of the present disclosure.

[0394] In a particular embodiment of the present disclosure, the elements included in the present disclosure have been expressed in singular or plural form according to the particular embodiment of the present disclosure proposed. However, for ease of explanation, the expression in singular or plural form is appropriately selected according to the situation proposed and the expression in singular or plural form is not intended to limit the present disclosure to a single or multiple elements. Even when an element is expressed in plural form, it can also be provided as a single element, and even when an element is expressed in singular form, it can also be provided as multiple elements.

[0395] Although the present disclosure has been described by various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method performed by a terminal in a wireless communication system, the method include: receiving a radio resource control (RRC) message from a base station, the RRC message including configuration information associated with downlink control information (DCI) related to power saving information; Based on the configuration information, detecting DCI including wake-up information of the terminal and sleep indication information of a secondary cell Scell; as well as When the wake-up information indicates that the terminal is not to wake up and the sleep indication information indicates that the cell state of the Scell ​​is an activated state, a physical downlink control channel PDCCH monitoring operation is performed on the Scell.

2. The method according to claim 1, in, The configuration information associated with the DCI related to the power saving information includes a power saving offset PS-offset indicating a first start time when the terminal starts monitoring the PDCCH of the DCI before a second start time of a drx-onDuration timer.

3. The method according to claim 1, in, When the wake-up information indicates that the terminal is awake and the sleep indication information indicates that the cell state of the Scell ​​is a sleep state, a PDCCH monitoring operation on the Scell ​​is not performed during a discontinuous reception (DRX) activation time.

4. A terminal in a wireless communication system, the terminal include: Transceiver; as well as at least one processor coupled to the transceiver and configured to: receiving, by the transceiver, a radio resource control (RRC) message from a base station, the RRC message including configuration information associated with downlink control information (DCI) related to power saving information; Based on the configuration information, detecting DCI including wake-up information of the terminal and sleep indication information of a secondary cell Scell; as well as When the wake-up information indicates that the terminal is not to wake up and the sleep indication information indicates that the cell state of the Scell ​​is an activated state, a physical downlink control channel PDCCH monitoring operation is performed on the Scell.

5. The terminal according to claim 4, in, The configuration information associated with the DCI related to power saving information includes a power saving offset PS-offset indicating a first start time when the terminal starts monitoring the PDCCH of the DCI before a second start time of a drx-onDuration timer.

6. The terminal according to claim 4, in, When the wake-up information indicates that the terminal is awake and the sleep indication information indicates that the cell state of the Scell ​​is a sleep state, a PDCCH monitoring operation on the Scell ​​is not performed during a discontinuous reception (DRX) activation time.

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