Method and apparatus for performing random access in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a wireless communication system includes receiving configuration information related to a network energy saving (NES) mode from a base station, receiving a message indicating execution of the NES mode from the base station after a random access (RA) is triggered, and executing the NES mode based on the configuration information. It is identified whether the at least one resource related to the RA and the at least one resource related to the NES mode overlap.

Description

Technical Field

[0001] The present disclosure relates to operations of a UE and a BS in a wireless communication system, and more particularly, to a method and apparatus for performing random access by a UE when a network energy saving (NES) mode is configured to reduce power consumption of a communication network. Background Art

[0002] 5G mobile communication technology defines a wide frequency band so that high transmission rates and new services are possible, and can be realized not only in the "lower (Sub) 6GHz" frequency band such as 3.5GHz, but also in the "above (Above) 6GHz" frequency band called millimeter wave (mmWave), which includes 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technology (called Beyond 5G system) in the terahertz (THz) frequency band (for example, 95GHz to 3THz frequency band) in order to achieve a transmission rate 50 times faster than 5G mobile communication technology and an ultra-low latency of one tenth of 5G mobile communication technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements for enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), and massive machine type communications (mMTC), standardization has been carried out on the following technologies: beamforming and massive MIMO for mitigating radio wave path loss and increasing radio wave transmission distance in millimeter wave (mmWave); support parameter sets (e.g., operating multiple subcarrier spacings) for efficient use of millimeter wave (mmWave) resources and dynamic operation of time slot formats; initial access technology supporting multi-beam transmission and broadband; definition and operation of bandwidth part (BWP); new channel coding methods such as low-density parity check (LDPC) codes for large-volume data transmission and polar codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks dedicated to specified services.

[0004] Currently, with respect to services supported by 5G mobile communication technology, discussions are underway on improvements and performance enhancements of initial 5G mobile communication technology, and physical layer standardization has been conducted on, for example, the following technologies: Vehicle-to-Everything (V2X), which assists autonomous vehicles in driving decisions and enhances user convenience based on vehicle location and status information sent by the vehicle; New Radio Unlicensed (NR-U), which aims to enable system operations to comply with various regulatory requirements in unlicensed frequency bands; NR UE energy saving; Non-Terrestrial Network (NTN), which is UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] In addition, standardization is underway for air interface architecture / protocols for technologies such as Industrial Internet of Things (IIoT) that supports new services through interconnection and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access (NR two-step RACH) that simplifies the random access procedure. Standardization is also underway for 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software-defined network (SDN) technologies, and system architecture / services for mobile edge computing (MEC) for receiving services based on terminal locations.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of connected devices will be connected to the communication network, and it is therefore expected that enhanced functionality and performance of the 5G mobile communication system and integrated operation of the connected devices will be necessary. To this end, new research related to the following technologies is arranged: Extended Reality (XR) for effectively supporting Augmented Reality (AR), Virtual Reality (VR), Mixed Reality (MR), etc.; 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML); AI service support; Metaverse service support; and UAV communication.

[0007] Furthermore, this development of 5G mobile communication systems will not only serve as a technology for developing the following technologies: new waveforms for providing coverage in the terahertz band for 6G mobile communication technology; multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas; metamaterial-based lenses and antennas for improving signal coverage in the terahertz band; high-dimensional spatial multiplexing technologies using orbital angular momentum (OAM) and reconfigurable smart surfaces (RIS), but will also serve as a basis for developing the following technologies: full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and improving system networks; AI-based communication technology for achieving system optimization using satellites and artificial intelligence (AI) from the design stage and internalizing end-to-end AI support functions; and next-generation distributed computing technology for implementing services whose complexity exceeds the limits of UE operating capabilities using ultra-high-performance communication and computing resources.

[0008] Meanwhile, when the NES mode is configured to reduce power consumption of a communication network in a wireless communication system, a detailed method for performing random access is required.

[0009] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above information might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0010] [Solution to the problem]

[0011] The present disclosure relates to a wireless communication network, and more particularly to a terminal and a communication method thereof in a wireless communication system.

[0012] According to one aspect of the present disclosure, a method for operating a user equipment (UE) in a wireless communication system includes: receiving configuration information of random access (RA) resources for a network energy saving (NES) mode from a base station (BS); triggering operation of the NES mode; after triggering the operation of the NES mode, determining whether the RA resources used for the NES mode overlap with resources selected for sending a first message based on the received configuration information of the RA resources, and in the case that the RA resources used for the NES mode overlap with resources used for sending the first message, canceling the selection of the resources used for sending the first message, wherein the first message includes a RA preamble code.

[0013] [Beneficial Effects of the Invention]

[0014] An aspect of the present disclosure is to address at least the above problems and / or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide an efficient communication method in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which: Figure 1 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is illustrated.

[0016] Figure 2 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is illustrated.

[0017] Figure 3 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is illustrated.

[0018] Figure 4 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is illustrated.

[0019] Figure 5 A wireless communication system according to various embodiments of the present disclosure is illustrated.

[0020] Figure 6 A structure of a BS according to an embodiment of the present disclosure is illustrated.

[0021] Figure 7 The structure of a UE according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0022] [Best Mode for Carrying Out the Invention]

[0023] An aspect of the present disclosure is to solve at least the above problems and / or disadvantages and to provide at least the advantages described below. Therefore, an aspect of the present disclosure is to provide a terminal in a wireless communication system and a communication method thereof.

[0024] The disclosed embodiments provide an apparatus and method capable of effectively providing services in a wireless communication system.

[0025] According to an embodiment of the present disclosure, a method for operating a user equipment (UE) in a wireless communication system includes: receiving configuration information of random access (RA) resources for a network energy saving (NES) mode from a base station (BS); triggering the operation of the NES mode; after triggering the operation of the NES mode, determining whether the RA resources used for the NES mode overlap with the resources selected for sending a first message based on the received configuration information of the RA resources, and in the case that the RA resources used for the NES mode overlap with the resources used for sending the first message, canceling the selection of the resources for sending the first message, wherein the first message includes a RA preamble code.

[0026] Various embodiments of the present disclosure provide apparatuses and methods for efficiently providing services in a wireless communication system.

[0027] Advantageous effects obtainable from the present disclosure may not be limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present disclosure pertains through the following description.

[0028] Before proceeding to the following detailed description, it may be helpful to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprising" and their derivatives mean including but not limited to; the term "or" is inclusive, meaning 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, interleaved, juxtaposed, adjacent, bound to or bound with, having, having the property of, etc.; and the term "controller" means any device, system, or portion 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.

[0029] 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 contained in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, related data, or parts thereof suitable for implementation in appropriate computer-readable program codes. 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 excludes wired, wireless, optical or other communication links that transmit transient electrical signals or other signals. A non-transitory computer-readable medium includes a medium in which data can be permanently stored, as well as a medium in which data can be stored and then rewritten, such as a rewritable optical disk or an erasable storage device.

[0030] 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.

[0031] [Mode for the Invention]

[0032] Discussed below Figures 1 to 7 The various embodiments used to describe the principles of the present disclosure in this patent document are merely exemplary and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0033] Hereinafter, the operating principle of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description of the present disclosure, when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear, the detailed description of the known functions or configurations incorporated herein will be omitted. The terms to be described below are terms defined in consideration of the functions in the present disclosure, and may be different according to the user, the user's intention or habit. Therefore, the definition of terms should be based on the content of the entire specification. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will be apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only for fully disclosing the present disclosure, and the scope of the present disclosure is informed to those skilled in the art, and the present disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0034] In the following description, for the purpose of convenience of description, terms used to identify access nodes, terms related to network entities, terms related to messages, terms related to interfaces between network entities, terms related to various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms related to subjects with equivalent technical meanings may be used.

[0035] In the following description, the terms "physical channel" and "signal" may be used interchangeably with the terms "data" or "control signal". For example, a physical downlink shared channel (PDSCH) is a term referring to a physical channel on which data is transmitted, but PDSCH may be used to refer to data. That is, in the present disclosure, the expression "transmitting a physical channel" may be interpreted as having the same meaning as "transmitting data or a signal through a physical channel".

[0036] In the following description of the present disclosure, high-layer signaling may mean a signal transmission method in which a base station sends a signal to an electronic device by using a downlink data channel in a physical layer, or an electronic device sends a signal to a base station by using an uplink data channel in a physical layer. High-layer signaling may be understood as radio resource control (RRC) signaling or a media access control (MAC) control element (CE).

[0037] In the following description of the present disclosure, for the convenience of description, terms and names defined in the 3rd Generation Partnership Project New Radio (3GPP NR) or 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standards may be used. However, the present disclosure is not limited to these terms and names and can be applied to systems conforming to other standards in the same manner. In the present disclosure, the term "eNB" may be used interchangeably with the term "gNB". That is, a base station described as an "eNB" may indicate a "gNB". In addition, the term "terminal" may refer to mobile phones, MTC devices, NB-IoT devices, sensors, and other wireless communication devices.

[0038] In the following description, a base station is an entity that allocates resources to a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Of course, examples of base stations and terminals are not limited thereto.

[0039] Wireless communication systems are developing towards broadband wireless communication systems in order to provide high-speed, high-quality packet data services in addition to typical voice-based services using communication standards such as 3GPP's High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), Long Term Evolution-Advanced (LTE-A), LTE-Pro, 3GPP2's High Speed ​​Packet Data (HRPD), Ultra Mobile Broadband (UMB), IEEE 802.16e, etc.

[0040] As a typical example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme in the downlink (DL) and a single carrier frequency division multiple access (SC-FDMA) scheme in the uplink (UL). The uplink indicates a wireless link through which a user equipment (UE) (or a mobile station (MS)) transmits data or a control signal to a base station (BS) (eNode B), and the downlink indicates a wireless link through which a base station transmits data or a control signal to a UE. The above-mentioned multiple access scheme can separate the data or control information of the corresponding user by allocating and operating time-frequency resources for transmitting data or control information to each user to avoid overlapping with each other, that is, establishing orthogonality.

[0041] Since the 5G communication system, which is a communication system after LTE, must freely reflect various needs of users, service providers, etc., it is necessary to support services that meet various needs. Services considered in the 5G communication system include enhanced mobile broadband (eMBB) communication, massive machine type communication (mMTC), ultra-reliability low latency communication (URLLC), etc.

[0042] According to some embodiments, eMBB is intended to provide a higher data rate than that supported by existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, eMBB must provide a peak data rate of 20Gbps in the downlink and a peak data rate of 10Gbps in the uplink for a single base station. In addition, the 5G communication system must provide an increased user-perceived data rate as well as a maximum data rate to the UE. In order to meet this demand, it is necessary to improve the transmission / reception technology including further enhanced multiple-input multiple-output (MIMO) transmission technology. In addition, the data rate required by the 5G communication system can be obtained by using a frequency bandwidth greater than 20MHz in a frequency band of 3 to 6GHz or 6GHz or higher, instead of using a transmission bandwidth of up to 20MHz to send signals in a frequency band of 2GHz used in LTE.

[0043] In addition, mMTC is considered to support application services such as the Internet of Things (IoT) in the 5G communication system. In order to effectively provide the IoT, mMTC has requirements such as supporting the connection of a large number of UEs in a cell, enhancing the coverage of UEs, improving battery time, reducing the cost of UEs, etc. Since the IoT provides communication functions while providing to various sensors and various devices, it must support a large number of UEs in a cell (for example, 1,000,000 UEs / km 2 ). In addition, a UE supporting mMTC may require wider coverage than other services provided by the 5G communication system because the UE may be located in a shadow area such as a basement of a building, which is not covered by a cell due to the characteristics of the service. A UE supporting mMTC must be configured to be inexpensive and may require a very long battery life, such as 10 to 15 years, because it is difficult to frequently replace the battery of the UE.

[0044] Finally, URLLC is a cellular-based mission-critical wireless communication service that can be used for remote control of robots or machines, industrial automation, drones, remote health care, emergency alerts, etc. Therefore, URLLC must provide communications with ultra-low latency and ultra-high reliability. For example, services supporting URLLC must meet an air interface latency of less than 0.5ms and also require 10 -5Therefore, for services supporting URLLC, the 5G system must provide a shorter TTI than other services, and may also require a design that allocates a large amount of resources in the frequency band to ensure the reliability of the communication link.

[0045] The above three services considered in the 5G communication system, i.e., eMBB, URLLC, and mMTC, can be multiplexed and transmitted in a single system. In order to meet the different needs of the corresponding services, different transmission / reception technologies and transmission / reception parameters can be used between services. However, the above mMTC, URLLC, and eMBB are only examples of different types of services, and the service types applied by the present disclosure are not limited to the above examples.

[0046] In addition, in the following description, LTE, LTE-A, LTE Pro or 5G (or NR or next generation mobile communication) systems will be described by way of example, but the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. In addition, based on the determination of those skilled in the art, the embodiments of the present disclosure may also be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0047] In the present disclosure, "downlink (DL)" refers to a radio link via which a base station sends a signal to a terminal, and "uplink (UL)" refers to a radio link via which a terminal sends a signal to a base station. In addition, in the following description, an LTE or LTE-A system may be described by example, but the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems may include fifth-generation mobile communication technologies (5G, new radio, and NR) developed outside of LTE-A, and in the following description, "5G" may be a concept covering existing LTE, LTE-A, or other similar services. In addition, based on the determination of those skilled in the art, the embodiments of the present disclosure may also be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0048] It will be understood herein that each box of the flowchart diagram and the combination of boxes in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the function specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-available or computer-readable memory, and can guide the computer or other programmable data processing device to run in a specific manner, so that the instructions stored in the computer-available or computer-readable memory produce a product including an instruction device that implements the function specified in one or more flowchart boxes. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on a computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the function specified in one or more flowchart boxes.

[0049] In addition, each box of the flowchart diagram can represent a module, segment or part of the code, which includes one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions recorded in the box may not occur in order. For example, two boxes shown in succession can actually be executed substantially simultaneously, or these boxes can sometimes be executed in reverse order, depending on the functions involved.

[0050] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have a meaning limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by the "unit" can be combined into a smaller number of elements, or "units", or divided into a larger number of elements, or "units". In addition, elements and "units" may be implemented as one or more CPUs in a reproduction device or a secure multimedia card. In addition, the "unit" in the embodiment may include one or more processors.

[0051] In the following description, for ease of description, the present disclosure will be described using terms and names defined in 5G and NR standards, which are the latest standards specified by the Third Generation Partnership Project Long Term Evolution (3GPP LTE) among existing communication standards. However, the present disclosure is not limited by these terms and names, and can be applied to systems conforming to other standards in the same manner. In particular, the present disclosure can be applied to 3GPP 5GS / NR (fifth generation mobile communication standard).

[0052] A base station (BS) operating in a network energy saving (NES) mode may not be able to transmit and receive signals, and thus may have difficulty supporting a random access procedure of a user equipment (UE). A non-designated UE that is not connected to the BS may also perform a random access procedure for initial access or re-access. Therefore, considering not only connected UEs but also non-connected UEs, a BS supporting the NES mode may be required to perform random access at a time point when transmission and reception are possible.

[0053] Therefore, the BS may provide the UE with information about random access resources (eg, a physical random access channel (PRACH)) allocated to a time when transmission and reception of the BS outside the NES mode operation period are possible.

[0054] As an embodiment, when the BS operates in the NES mode, the BS may allocate one or more random access resources, which may be individually divided in consideration of the NES mode, and notify the UE of the one or more allocated random access resources.

[0055] As an embodiment, the BS may allocate one or more random access resources that the BS may receive in the direction of different BS beams (eg, a synchronization signal frame (SSB) or a channel state information reference signal (CSI-RS)), and notify the UE of the allocated one or more random access resources.

[0056] As an embodiment, the random access resources that may be divided may be random access resources existing in different frequency bands in which the BS does not use the NES mode.

[0057] As an embodiment, the random access resources that may be divided may be random access resources allocated to a designated time and frequency that ensures that the BS does not use the NES mode.

[0058] As an implementation manner, the random access resources that may be divided may be time and frequency resources that are periodically allocated.

[0059] As an embodiment, the random access resources that may be divided may be time and frequency resources that are aperiodically activated by a designated condition (eg, a designated downlink signal of a BS).

[0060] The BS may transmit information about random access resources, which may be individually divided and used in the NES mode, to the UE through a downlink signal.

[0061] As an embodiment, the BS may insert information about random access resources (e.g., PRACH resource allocation information) into a downlink signal (e.g., MIB or SIB) and send the downlink signal, which random access resources may be separately divided and may be used in NES mode, and the downlink signal may be sent (or broadcast) to multiple UEs.

[0062] As an embodiment, the BS may insert information about random access resources (e.g., PRACH resource allocation information) into a downlink signal (e.g., RRCReconfig or NESCommand) and send the downlink signal, which random access resources may be separately divided and used in the NES mode, and the downlink signal is sent to a UE connected within the BS.

[0063] For example, the BS may send PRACH resource allocation information that can be used in NES mode to the UE within uplink bandwidth part (BWP) configuration information, which may be configured by an RRC message. The PRACH resource allocation information that can be used in NES mode may be included in an information element of uplink BWP configuration information (e.g., "rach-ConfigCommonNES-r18", "rach-ConfigCommonIABNES-r18", "msgA-ConfigCommonNES-r18", or "rach-ConfigCommonNESTwoStepRA-r18"). The IE that may include the PRACH resource allocation information that can be used in NES mode may be indicated as shown in [Table 1] to [Table 3] below.

[0064] [Table 1]

[0065] [Table 2]

[0066] [Table 3]

[0067] For example, the BS may configure a separate PRACH resource that can be used in the NES mode as an IE (eg, "rach-ConfigBFRNES-r18") for beam failure recovery of the UE. The IE that can configure a separate PRACH resource available in the NES mode may be as shown in [Table 4] below.

[0068] [Table 4]

[0069] The random access performed by the UE may be a 4-step random access including four signal transmission and reception operations and a 2-step random access including two signal transmission and reception operations.

[0070] 4-step random access may be a process of sending and receiving a total of 4 messages from message (Mg) 1 to Msg4. Msg1 may be a random access (RA) preamble sent by the UE to the BS. Msg2 may be a random access response (RAR) sent by the BS to the UE. Msg3 may be a message including UE information for the UE sent by the UE. Msg4 may be a contention resolution message sent by the BS to the UE.

[0071] 2-step random access may be a process of sending and receiving a total of 2 messages from MsgA to MsgB. MsgA may include a message including a random access preamble and UE information sent by the UE to the BS. MsgB may include RAR and a contention resolution message, and the BS sends the contention resolution message to the UE.

[0072] In case that the BS starts operating in the NES mode when the UE and the BS perform random access, the operation of the UE may vary according to the state of the random access being performed.

[0073] Figure 1 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is illustrated.

[0074] Reference Figure 1 , which may describe the UE operation in the case where the NES mode is activated before the UE sends the first message after random access is triggered or receives the NES mode activation message from the BS. The NES mode activation message may include the NES mode command of the BS. In the following embodiments, the first message may be Msg1 or MsgA.

[0075] In operation 110, the UE may receive configuration information of random access resources available in the NES mode. The configuration information of random access resources available in the NES mode may include allocation information of random access resources available in the NES mode. However, operation 110 may be omitted.

[0076] In operation 120, the UE may trigger random access. When the BS operates in normal mode before entering the NES mode, the UE that triggers the random access may measure a reference signal (e.g., SSB and / or CSI-RS) of the BS. The UE may select a random access resource (e.g., a PRACH resource) that has a correlation with a reference signal having good performance among the measured reference signals. The UE may send a first message (e.g., Msg1 or MsgA) including a random access preamble to the BS through the selected random access resource. However, the operation of sending the first message of the UE may be an operation in the case where the NES mode start message is not received from the BS before sending the first message to the BS.

[0077] In operation 130, the UE triggering random access may trigger the NES mode by the BS (eg, when the NES mode is activated or a NES mode activation message is received from the BS).

[0078] When the BS starts the NES mode in an environment where a UE that triggers random access exists (for example, when the BS sends a designated message including NES mode start information to the UE), the UE can determine in operation 140 whether the random access resources used for the NES mode overlap with the random access resources selected by the UE for sending the first message.

[0079] When the random access resources belonging to the NES resources overlap with the resources used to send the random access preamble, the UE may cancel the selected random access resources and select the random access resources for the NES mode in operation 150. That is, the UE may postpone the transmission of the first message after the NES mode operation of the BS. In the same sense, the UE may use the preset random access resources for the NES mode according to the activation of the NES mode of the BS, instead of using the normal random access resources.

[0080] When the random access resources belonging to the NES resources do not overlap with the resources for transmitting the random access preamble of the UE, the UE may transmit the first message to the BS by using the selected random access resources in operation 160.

[0081] As an implementation method, the UE may not determine whether the random access resources used for the NES mode and the random access resources selected by the UE for sending the first message overlap with each other. Therefore, the UE may cancel the selected random access resources and postpone the sending of the first message after the NES mode operation. That is, the UE may select the random access resources for the NES mode, and according to the start of the NES mode of the BS, use the preset random access resources for the NES mode instead of using the normal random access resources.

[0082] As an embodiment, when the BS configures random access resources that do not overlap with the NES mode, an increase in the probability of collision caused by the overlapping transmission of the first message of the UE in all or some random access resources (for example, the random access resources that can be used first after the NES mode ends) can be prevented. The BS can additionally send a designated downlink signal or information (for example, a separate backoff parameter used in the random access resource) to the UE through a separate backoff to prevent an increase in the probability of collision. When receiving the designated downlink signal or information for reducing the probability of collision from the BS, the UE can perform an additional backoff.

[0083] Figure 1 The operations described in may be used for random access techniques (eg, 4-step random access, 2-step random access, contention-based random access, and contention-free random access) to send a first message.

[0084] Figure 2 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is shown.

[0085] Reference Figure 2 , can describe the operation of the UE in the case where the NES mode is started or a NES mode start message is received from the BS after the UE triggering random access sends a first message.

[0086] In operation 210, the UE may receive configuration information of random access resources available in the NES mode. The configuration information of random access resources available in the NES mode may include allocation information of random access resources available in the NES mode. However, operation 210 may be omitted.

[0087] In operation 220, the UE may trigger random access. When the BS operates in the normal mode before entering the NES mode, the UE triggering the random access may measure the reference signal (e.g., SSB and / or CSI-RS) of the BS. The UE may select a random access resource (e.g., a PRACH resource) having a correlation with a reference signal having good performance among the measured reference signals.

[0088] In operation 230, the UE may transmit a first message including a random access preamble to the BS through the selected random access resource.

[0089] In operation 240, the UE may run a RAR timer corresponding to a RA response window (RAR-window) or a MsgB response window (MsgB-responsewindow). The RAR window or the MsgB response window may be the length of time until the second message is received from the BS. When the UE does not receive the second message from the BS before the RAR timer reaches the configured RAR window or MsgB-response window value, the UE may consider that the corresponding random access attempt has failed. In the following embodiments, the second message may be a RAR or a MsgB.

[0090] In operation 250, after the UE sends the first message to the BS, the NES mode is triggered (eg, the NES mode is activated or an NES mode activation message is received from the BS).

[0091] When the UE does not receive the second message (e.g., Msg2 or MsgB) from the BS before the NES mode is started, the UE may suspend the RAR timer in operation 260. When the BS operates in the NES mode, the UE may suspend the RAR time without expiring the RAR time. When the BS starts normal operation after the NES mode ends, the UE may update the RAR window or MsgB response window to a new RAR window or MsgB response window value after the suspension. In other words, the UE may update the RAR window or MsgB response window in consideration of the NES mode. The updated RAR window may be a value obtained by adding the RAR window before the update and the operating time of the NES mode. The updated MsgB response window may be a value obtained by adding the MsgB response window before the update and the operating time of the NES mode.

[0092] When the BS starts a normal operation after the NES mode ends, the UE may run the RAR time again in operation 270 .

[0093] As an implementation manner, when the NES mode is started after the UE sends the first message, the UE may suspend the RAR timer until the NES mode ends. When the NES mode ends, the UE may resume the RAR timer.

[0094] As an implementation method, when the NES mode is started, the UE may suspend the RAR timer and delete the length information of the remaining window. When the NES mode ends, the UE may restart the RAR timer configured by the BS.

[0095] As an embodiment, the BS may update the RAR window or the MsgB response window to a value obtained by adding the operation time of the NES mode thereto. The BS may insert the updated RAR window or the MsgB response window into the NES mode start message and send the NES mode start message to the UE.

[0096] As an implementation method, when the NES mode is started after the UE sends a first message to the BS or a NES mode start message is received from the BS, the UE may consider that the random access procedure has failed. The UE may resume the random access procedure after the NES mode ends. For example, the restart of the random access procedure may mean the start of a new random access procedure. Therefore, when the new random access procedure starts, the UE may refresh the buffer of the third message (e.g., process all data segments in the buffer), set PREAMBLE_TRANSMISSION_COUNTER to 1, and initialize PREAMBLE_POWER_RAMPING_COUNTER to 1. The detailed process may follow the media access control (MAC) standard of 3GPP TS38.321.

[0097] As an embodiment, when the NES mode is started after the UE sends the first message to the BS or receives the NES mode start message from the BS, the UE may consider that the random access procedure has failed, and start the procedure from the transmission of the first message after the NES mode ends (ie, operation 230). At this time, the UE may increase PREAMBLE_TRANSMISSION_COUNTER by 1, and other configurations and operations may follow the MAC standard of 3GPP TS38.321.

[0098] As an embodiment, when the NES mode is started after the UE sends the first message to the BS or the NES mode start message is received from the BS, the UE may consider that the random access procedure has failed. In addition, the UE may resume the procedure from the sending of the first message (i.e., operation 230) after the NES mode ends. At this time, the UE may maintain PREAMBLE_TRANSMISSION_COUNTER, or other configurations and operations may follow the MAC standard of 3GPP TS38.321.

[0099] As an embodiment, when there is no random access procedure being executed, the base station may postpone the operation of the network energy saving (NES) mode after the random access procedure ends or the attempt ends, instead of starting the operation of the NES mode.

[0100] As an embodiment, the UE may determine whether the RAR window or MsgB response window resources configured to receive the second message (e.g., RAR or MsgB) are included in the random access resources for NES. When the RAR window or MsgB response window resources configured to receive the second message are included in the random access resources for NES mode, the UE may perform the above process (e.g., the process after operation 230).

[0101] As an embodiment, when the UE confirms (or detects or recognizes) activation of the NES mode (eg, receives an NES mode activation message), the UE may perform a process (eg, a process after operation 260 ).

[0102] Figure 2 The operations described in may be used for random access techniques (eg, 4-step random access, 2-step random access, contention-based random access, and contention-free random access) to receive a second message (eg, Msg2 or MsgB).

[0103] Figure 3 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is illustrated.

[0104] Reference Figure 3 , it can describe the operation of the UE in a case where the NES mode is started or an NES mode start message is received from the BS after the UE triggering random access receives a second message from the BS.

[0105] In operation 305, the UE may receive configuration information of random access resources available in the NES mode. The configuration information of random access resources available in the NES mode may include allocation information of random access resources available in the NES mode. However, operation 305 may be omitted.

[0106] In operation 310, the UE may trigger random access. When the BS operates in a normal mode before entering the NES mode, the UE triggering the random access may measure a reference signal (e.g., SSB and / or CSI-RS) of the BS. The UE may select a random access resource (e.g., a PRACH resource) that has a correlation with a reference signal having good performance among the measured reference signals.

[0107] In operation 315, the UE may transmit a first message including a random access preamble to the BS through the selected random access resource.

[0108] The UE may start the RAR timer in operation 320. The UE may receive the second message from the BS within the RAR window or the MsgB response window.

[0109] In operation 325 , after the UE receives the second message from the BS, the NES mode may be triggered (activate the NES mode or receive an NES mode activation message from the BS).

[0110] In operation 330, the UE may determine whether the random access resource for the NES mode overlaps with the random access resource for sending the third message. The random access resource selected by the UE for sending the third message may be an uplink resource allocated by the second message received from the BS. In the following embodiments, the third message may be Msg3.

[0111] When the random access resources for the NES mode overlap with the random access resources selected by the UE for transmitting the third message, the UE may stop transmission of the third message (eg, Msg3) overlapping with the NES mode resources in operation 335 .

[0112] In operation 340, after the NES mode ends, the UE may start the RAR time and wait for receiving a second message from the BS.

[0113] In operation 345, the UE may receive the second message including new uplink resource allocation information from the BS again in order to transmit the third message within the RAR window.

[0114] When the random access resources used for the NES mode do not overlap with the random access resources selected by the UE for transmitting the third message, in operation 350, the UE may transmit the third message to the BS through the selected uplink resources.

[0115] As an implementation, when the random access resource used for the NES mode overlaps with the random access resource selected by the UE for sending the third message, the UE may consider that the random access attempt being performed has failed, and restart the random access from the sending of the first message after the NES mode ends (ie, operation 315). At this time, the UE may increase the PREAMBLE_TRANSMISSION_COUNTER by 1, and other configurations and operations may follow the MAC standard of 3GPP TS38.321.

[0116] As an embodiment, when the random access resource used for the NES mode overlaps with the random access resource used to send the third message selected by the UE, the UE may consider that the random access attempt being performed has failed, and restart the random access from the sending of the first message after the NES mode ends (ie, operation 315). At this time, the UE may maintain PREAMBLE_TRANSMISSION_COUNTER, or other configurations and operations may follow the MAC standard of 3GPP TS38.321.

[0117] As an implementation method, when the random access resources used for the NES mode overlap with the random access resources used to send the third message selected by the UE, the UE may consider that the current random access procedure has failed, and after the NES mode ends, the random access procedure is started again from the beginning (e.g., operation 305). For example, the restart of the random access procedure may mean the start of a new random access procedure. Therefore, when the new random access procedure starts, the UE may refresh the buffer of the third message (e.g., process all data segments in the buffer), set PREAMBLE_TRANSMISSION_COUNTER to 1, and initialize PREAMBLE_POWER_RAMPING_COUNTER to 1. The detailed process may follow the MAC standard of 3GPP TS38.321.

[0118] As an embodiment, if a NES mode start message notifying the start of the NES mode is sent when the BS starts the NES mode, the BS may send a NES mode start message including a new second message to the UE to which the second message was previously sent. The new second message may include allocation information of new uplink resources for the UE to send a third message to the BS after the NES mode ends.

[0119] As an implementation method, the BS may allocate new uplink resources to the UE to which the second message was previously sent, and the new uplink resources are used to send a third message by the UE after the NES mode ends. Information about the uplink resources allocated by the BS can be detected by the BS and the UE by calculation using the existing allocated uplink resources and the random access resource configuration information for the NES mode without the need for separate signaling. For example, when the start time (e.g., time slot index) of the existing uplink transmission is T, the start time of the new uplink transmission can be a value obtained by adding T to the operating time length of the NES mode. Alternatively, the start time of the new uplink transmission can be a value obtained by adding T, the operating time length of the NES mode, and a predetermined offset value. The predetermined offset value can be notified to the UE in advance by the BS through a downlink signal.

[0120] As an embodiment, when there is no random access procedure being performed, the BS may postpone the operation of the NES mode after the execution of the random access procedure is completed or attempted, instead of starting the operation of the NES mode.

[0121] As an embodiment, the UE may determine whether the uplink resources allocated for sending the third message overlap with the random access resources used for the NES mode, and when the uplink resources allocated for sending the third message overlap with the random access resources used for the NES mode, perform a process (e.g., at least one of the processes after operation 335).

[0122] As an embodiment, when the UE confirms (or detects or recognizes) activation of the NES mode (eg, receives an NES mode activation message), the UE may perform a process (eg, a process after operation 330 ).

[0123] Figure 3 The operations described in may be used for a random access technique (eg, 4-step random access or contention-based random access) to send the third message.

[0124] Figure 4 A random access procedure when the NES mode is activated according to an embodiment of the present disclosure is illustrated.

[0125] Reference Figure 4 , it can describe the operation of the UE in a case where the NES mode is started or an NES mode start message is received from the BS after the UE triggering random access sends a third message to the BS.

[0126] In operation 410, the UE may receive configuration information of random access resources available in the NES mode. The configuration information of random access resources available in the NES mode may include allocation information of random access resources available in the NES mode. However, operation 410 may be omitted.

[0127] In operation 420, the UE may trigger random access. When the BS operates in the normal mode before entering the NES mode, the UE triggering the random access may measure the reference signal (e.g., SSB and / or CSI-RS) of the BS. The UE may select a random access resource (e.g., a PRACH resource) having a correlation with a reference signal having good performance among the measured reference signals.

[0128] In operation 430, the UE may transmit a first message including a random access preamble to the BS through the selected random access resource.

[0129] In operation 440, the UE may start a RAR window or a MsgB response window. The UE may receive a second message from the BS within the RAR window or the MsgB response window. The BS may allocate uplink resources for sending a third message to the UE through the second message.

[0130] In operation 450, the UE may transmit a third message to the BS through the uplink resources allocated through the second message.

[0131] After sending the third message, the UE may start the operation of the contention resolution timer in operation 460. The contention resolution timer may be a timer for a reception standby time until a contention resolution signal of the fourth message is received from the BS, and may be referred to as "ra-ContentionResolutionTimer". In the following embodiments, the fourth message may be Msg4.

[0132] After the UE transmits the third message to the BS, the NES mode may be triggered in operation 470 (eg, the NES mode is activated or an NES mode activation message is received from the BS).

[0133] In operation 480, when the BS operates in the NES mode, the UE may suspend the operation of the contention resolution timer, and may resume the operation of the contention resolution timer after the NES mode ends. As an implementation, when the NES mode starts, the UE may suspend the contention resolution timer and delete the remaining timer information. In addition, after the NES mode ends, the UE may reset the contention resolution timer configured by the BS and resume the reset contention resolution timer.

[0134] As an implementation method, when the NES mode is started while the UE is waiting to receive a contention resolution signal, the UE can suspend the contention resolution timer while the BS is operating in the NES mode without expiring the remaining timer of the contention resolution timer. When the BS operates normally after the NES mode ends, the UE can resume the suspended contention resolution timer and wait to receive a contention resolution signal. In other words, the UE can update the ra-ContentionResolutionTimer considering the NES mode, and the updated ra-ContentionResolutionTimer can be a value obtained by adding the ra-ContentionResolutionTimer before the update to the NES operation time. In addition, the BS can insert the updated ra-ContentionResolutionTimer into the NES mode start message and send the NES mode start message to the UE.

[0135] As an implementation method, when the NES mode is started after the UE sends the third message to the BS or the NES mode start message is received from the BS, the UE may consider that the random access procedure has failed. Therefore, the UE may resume the random access procedure after the NES mode ends. For example, the restart of the random access procedure may mean the start of a new random access procedure. Therefore, when the new random access procedure starts, the UE may refresh the buffer of the third message (e.g., process all data segments in the buffer), set PREAMBLE_TRANSMISSION_COUNTER to 1, and initialize PREAMBLE_POWER_RAMPING_COUNTER to 1. The detailed process may follow the MAC standard of 3GPP TS38.321.

[0136] As an embodiment, when the NES mode is started after the UE sends the third message to the BS or the NES mode start message is received from the BS, the UE may consider that the random access attempt has failed. The UE may start the random access procedure from the sending of the first message (i.e., operation 430) after the NES mode ends. At this time, the UE may increase the PREAMBLE_TRANSMISSION_COUNTER by 1, and other configurations and operations may follow the MAC standard of 3GPP TS38.321.

[0137] As an embodiment, when the NES mode is started after the UE sends the third message to the BS or the NES mode start message is received from the BS, the UE may consider that the random access attempt has failed. The UE may start the random access procedure from the transmission of the first message (i.e., operation 430) after the NES mode ends. At this time, the UE may maintain PREAMBLE_TRANSMISSION_COUNTER, and other configurations and operations may follow the MAC standard of 3GPP TS38.321.

[0138] As an embodiment, when the random access procedure is being performed, the BS may postpone the operation of the NES mode until after the random access procedure is completed or attempted, without starting the operation of the NES mode.

[0139] Figure 4 The operations described in may be used for a random access technique (eg, 4-step random access or contention-based random access) to receive a fourth message.

[0140] Figure 5 A wireless communication system according to various embodiments of the present disclosure is illustrated. Figure 5 BS 510, UE 520, and UE 530 are illustrated as a part of nodes using a radio channel in a wireless communication system. Figure 5Only one BS is illustrated, but other BSs that are the same as or similar to the BS 510 may be further included.

[0141] BS 510 is a network infrastructure element that provides radio access to UEs 520 and 530. The coverage of BS 510 is a predetermined geographical area defined according to a range in which a signal can be transmitted. BS 510 may be referred to as an "access point (AP)", "eNode B (eNB)", "fifth generation (5G) node" / "gNode B (next generation Node B (gNB))", "radio point" or "transmission / reception point (TRP)", or another term having a technical meaning equivalent thereto as well as "base station".

[0142] Each of UE 520 and UE 530 is a device used by a user, and communicates with BS 510 through a wireless channel. Depending on the situation, at least one of UE 520 and UE 530 may operate without the involvement of a user. That is, at least one of UE 520 and UE 530 may be a device that performs machine type communication (MTC) and may not be carried by a user. Each of UE 520 and UE 530 may be referred to as a "user equipment (UE)", "mobile station", "subscriber station", "remote terminal", "wireless terminal" or "user device", or another term having an equivalent technical meaning as well as "terminal" is used.

[0143] BS 510, terminal 520, and UE 530 may transmit and receive wireless signals in a millimeter wave (mmwave) frequency band (e.g., 28 GHz, 30 GHz, 38 GHz, and 60 GHz). At this time, in order to increase the channel gain, BS 510, UE 520, and UE 530 may perform beamforming. Beamforming may include transmit beamforming and receive beamforming. That is, BS 510, UE 520, and UE 530 may assign directivity to a transmit signal or a receive signal. To this end, BS 510, UE 520, and UE 530 may select service beams 512, 513, 521, and 531 through a beam search process or a beam management process. After selecting service beams 512, 513, 521, and 531, communication may be performed through resources having a quasi-co-location (QCL) relationship with resources through which service beams 512, 513, 521, and 531 are transmitted.

[0144] If a large-scale characteristic of a channel used to send symbols through a first antenna port can be inferred from a channel used to send symbols through a second antenna port, it can be assessed that there is a QCL relationship between the first antenna port and the second antenna port. For example, the large-scale characteristic may include at least one of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial receiver parameters.

[0145] Figure 6 A structure of a BS according to an embodiment of the present disclosure is illustrated.

[0146] Figure 6 The illustrated configuration may be understood as the configuration of the BS 510. The term "unit" or "device" used hereinafter may mean a unit that processes at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software.

[0147] Reference Figure 6 , BS 510 may include a transceiver 610, a processor 620, and a memory 630. The transceiver 610, the processor 620, and the memory 630 may operate according to the communication method of the BS 510. The network device may also correspond to the structure of the BS 510. However, the elements of the BS 510 are not limited to the above examples. For example, the BS 510 may include more or less elements than the above elements. For example, the BS 510 may include a transceiver 610 and a processor 620. In addition, the transceiver 610, the processor 620, and the memory 630 may be implemented in the form of a single chip.

[0148] The transceiver 610 collectively refers to the receiver of the BS 510 and the transmitter of the BS, and can send signals to other BSs or other network devices and receive signals from other BSs or other network devices. At this time, the signals sent and received may include control information and data. The transceiver 610 may send, for example, system information to the UE, and send a synchronization signal or a reference signal. To this end, the transceiver 610 may include an RF transmitter for up-converting and amplifying the transmitted signal and an RF receiver for low-noise amplifying the received signal and down-converting. However, this is only an embodiment of the transceiver 610, and the elements of the transceiver 610 are not limited to the RF transmitter and the RF receiver. The transceiver 610 may include a wired / wireless transceiver and include various elements for sending and receiving signals. In addition, the transceiver 610 may receive a signal through a communication channel (e.g., a radio channel), output the signal to the processor 620, and send a signal output from the processor 620 through the communication channel. In addition, the transceiver 610 may receive a communication signal, output the communication signal to the processor, and transmit the signal output from the processor to the UE, another BS, or another entity through a wired / wireless network.

[0149] The memory 630 may store programs and data required for the operation of the BS 510. In addition, the memory 630 may store control information or data included in a signal acquired by the BS 510. The memory 630 may be configured by a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. The memory 630 may store at least one piece of information transmitted and received by the transceiver 610 and information generated by the processor 620.

[0150] In the present disclosure, the processor 620 may be defined as a circuit, a dedicated integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs communication control, and an application processor (AP) that controls a higher layer such as an application program. According to an embodiment proposed in the present disclosure, the processor 620 may control the overall operation of the BS 510. For example, the processor 620 may control the signal flow between blocks to perform operations according to the above-described flowchart.

[0151] Figure 7 The structure of a UE according to an embodiment of the present disclosure is illustrated.

[0152] Reference Figure 7 , UE 520 may include a transceiver 710, a processor 720, and a memory 730. The transceiver 710, the processor 720, and the memory 730 may operate according to the communication method of the UE. However, the elements of UE 520 are not limited thereto. For example, UE 520 may include more elements or fewer elements than the above elements. For example, UE 520 may include a transceiver 710 and a processor 720. In addition, the transceiver 710, the processor 720, and the memory 730 may be implemented in the form of a single chip.

[0153] The transceiver 710 collectively refers to the receiver of the UE 520 and the transmitter of the UE 520, and can send signals to other UEs or network entities and receive signals from other UEs or network entities. The signals sent to and received from the BS 510 may include control information and data. The transceiver 710 may receive system information from, for example, the BS 510, and may receive a synchronization signal or a reference signal. To this end, the transceiver 710 may include an RF transmitter for up-converting and amplifying the transmitted signal and an RF receiver for low-noise amplification of the received signal and down-converting. However, this is only an embodiment of the transceiver 710, and the elements of the transceiver 710 are not limited to the RF transmitter and the RF receiver. The transceiver 710 may include a wired / wireless transceiver and various elements for sending and receiving signals. The transceiver 710 may receive a signal through a radio channel, output the signal to the processor 720, and send a signal output from the processor 720 through a radio channel. The transceiver 710 may receive a communication signal, output the communication signal to the processor, and transmit the signal output from the processor to a network entity through a wired / wireless network.

[0154] The memory 730 may store programs and data required for the operation of the UE 520. The memory 730 may store control information or data included in a signal acquired by the UE 520. The memory 730 may be configured by a storage medium such as a ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media.

[0155] In the present disclosure, the processor 720 may be defined as a circuit, a dedicated integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs communication control, and an application processor (AP) that controls a higher layer such as an application layer. According to the embodiment proposed in the present disclosure, the processor 720 may control the overall operation of the UE 520. For example, the processor 720 may control the signal flow between the blocks to perform the operation according to the above-mentioned flowchart.

[0156] The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in software, hardware, or a combination of hardware and software.

[0157] As for software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors of an electronic device. One or more programs may include instructions for controlling an electronic device to perform a method according to an embodiment described in the claims or the specification of the present disclosure.

[0158] Such a program (software module, software) may be stored in a random access memory, a non-volatile memory, including flash memory, a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disk storage device, a compact disk (CD)-ROM, a digital versatile disk (DVD) or other optical storage device, and a magnetic tape cassette. Alternatively, it may be stored in a memory combining some or all of those recording media. Multiple memories may be included.

[0159] In addition, the program may be stored in an additional storage device accessible via 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 combining these networks. Such a storage device may access the device executing the embodiments of the present disclosure through an external port. In addition, a separate storage device on the communication network may access the device executing the embodiments of the present disclosure.

[0160] In the specified embodiments of the present disclosure, the components included in the present disclosure are expressed in singular or plural form. However, for ease of explanation, the singular or plural expression is appropriately selected according to the situation presented, the present disclosure is not limited to a single component or multiple components, a component expressed in plural form may be configured as a single component, and a component expressed in singular form may be configured as multiple components.

[0161] Meanwhile, although the specified embodiments have been described in the explanation of the present disclosure, it should be noted that various changes can be made therein without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure is not limited or defined by the described embodiments, and is not limited only by the scope of the following claims, but also by their equivalents.

[0162] The embodiments of the present disclosure described and shown in the specification and the drawings are merely specified examples, which have been presented to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, other variations based on the technical ideas of the present disclosure can be implemented, which will be apparent to those skilled in the art. In addition, as needed, the above-mentioned corresponding embodiments can be used in combination. For example, a part of an embodiment of the present disclosure can be combined with a part of another embodiment to operate a base station and a terminal. As an example, a part of embodiment 1 of the present disclosure can be combined with a part of embodiment 2 to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been proposed based on an FDD LTE system, other variations based on the technical ideas of the above-mentioned embodiments can also be implemented in other systems such as TDD LTE, 5G or NR systems.

[0163] In the drawings describing the methods of the present disclosure, the order of description does not always correspond to the order of performing the steps of each method, and the sequential relationship between the steps may be changed or the steps may be performed in parallel.

[0164] Alternatively, in the drawings describing the method of the present disclosure, some elements may be omitted, and only some elements may be included therein without departing from the basic spirit and scope of the present disclosure.

[0165] Furthermore, in the method of the present disclosure, some or all of the contents of each embodiment may be implemented in combination without departing from the basic spirit and scope of the present disclosure.

[0166] Various embodiments of the present disclosure have been described above. The above description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the embodiments described herein. Those skilled in the art will appreciate that the present disclosure can be easily modified and changed into other specified forms without departing from the technical ideas or essential features of the present disclosure. Therefore, the scope of the present disclosure should not be determined by the above detailed description, but by the appended claims, and all modifications and changes derived from the meaning and scope of the claims and their equivalents should be interpreted as falling within the scope of the present disclosure.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising: receiving configuration information related to a network energy saving NES mode from a base station; After random access RA is triggered, receiving a NES mode start message from the base station; as well as Based on the configuration information, it is identified whether at least one resource associated with the RA and at least one resource associated with the NES mode overlap.

2. The method according to claim 1, further comprising: In case the NES mode start message is received before the first message is sent to the base station, selecting at least one resource related to the NES mode; The first message includes a RA preamble or a radio resource control RRC connection request.

3. The method according to claim 1, further comprising: In case the NES mode start message is received before a second message is received from the base station, interrupting a window for receiving the second message; The second message includes a RA response RAR.

4. The method according to claim 1, further comprising: In case the NES mode start message is received before a third message is received from the base station, interrupting a timer for receiving the third message; The third message includes information about contention resolution.

5. A method performed by a base station in a wireless communication system, the method comprising: Sending configuration information related to the network energy saving NES mode to the user equipment UE; as well as After random access RA is triggered, a NES mode start message is sent to the UE, Wherein, an overlap of at least one resource associated with the RA and at least one resource associated with the NES mode is identified based on the configuration information.

6. The method according to claim 5, in, In case the NES mode start message is sent before the first message is received from the UE, at least one resource related to the NES mode is selected, and The first message includes a RA preamble or a radio resource control RRC connection request.

7. The method according to claim 5, in, In the case where the NES mode start message is sent before the second message is sent to the UE, a window for receiving the second message is interrupted, and The second message includes a RA response RAR.

8. The method according to claim 5, in, In case the NES mode start message is sent before the third message is sent to the UE, a timer for receiving the third message is interrupted, and The third message includes information about contention resolution.

9. A user equipment UE in a wireless communication system, the UE comprising: Transceiver; as well as at least one processor operably coupled to the transceiver, Wherein, the transceiver is configured as follows: Receiving configuration information related to a network energy saving NES mode from a base station; and After random access RA is triggered, receiving a NES mode start message from the base station, and Wherein, the at least one processor is configured as: Based on the configuration information, it is identified whether at least one resource associated with the RA and at least one resource associated with the NES mode overlap.

10. The UE according to claim 9, wherein: The at least one processor is further configured to: In case the NES mode start message is received before the first message is sent to the base station, selecting at least one resource related to the NES mode, The first message includes a RA preamble or a radio resource control RRC connection request.

11. The UE according to claim 9, wherein: The at least one processor is further configured to: In case the NES mode start message is received before a second message is received from the base station, interrupting a window for receiving the second message, The second message includes a RA response RAR.

12. The UE according to claim 9, wherein: The at least one processor is further configured to: In case the NES mode start message is received before a third message is received from the base station, interrupting a timer for receiving the third message, The third message includes information about contention resolution.

13. A base station in a wireless communication system, the base station comprising: at least one processor; as well as A transceiver operably coupled to the at least one processor, the transceiver being configured to: Sending configuration information related to the network energy saving NES mode to the user equipment UE; and After random access RA is triggered, a NES mode start message is sent to the UE, Wherein, an overlap of at least one resource associated with the RA and at least one resource associated with the NES mode is identified based on the configuration information.

14. The base station according to claim 13, in, In case the NES mode start message is sent before the first message is received from the UE, at least one resource related to the NES mode is selected, and The first message includes a RA preamble or a radio resource control RRC connection request.

15. The base station according to claim 13, in, In the case where the NES mode start message is sent before the second message is sent to the UE, a window for receiving the second message is interrupted, and The second message includes a RA response RAR.

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