Method and apparatus for controlling the dormant state of a secondary cell in a next generation mobile communication system

Abstract

The present disclosure relates to a communication method and system for converging a 5th generation (5G) communication system supporting a higher data rate than a 4th generation (4G) system with a technology for the Internet of Things (IoT). The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technology, such as smart homes, smart buildings, smart cities, smart cars, connected cars, healthcare, digital education, smart retail, security and prevention services. A method and apparatus for allocating V2X resources of an SN to a UE in a network supporting dual connectivity are provided, and a method and apparatus for controlling the dormant state of an SCell are also provided.

Description

Technical Field

[0001] The present disclosure relates to the operation of a base station and a UE in a mobile communication system and a method and apparatus for allocating vehicle-to-everything (V2X) resources in a secondary node (SN) for a UE in a radio resource control (RRC) idle state in a dual connectivity support network. More specifically, the present disclosure relates to a method for maintaining a sleep mode (or sleep state) of a secondary cell (SCell) when carrier aggregation (CA) is used in a wireless communication system (more specifically, in the third generation partnership project (3GPP) long term evolution (LTE) and 5G new radio (NR) technology). Background Art

[0002] In order to meet the demand for wireless data services that has been increasing since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as 'super 4G networks' or 'post-LTE systems'. 5G communication systems are considered to be implemented in higher frequency (mmWave) bands (e.g., 60GHz bands) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, developments for system network improvements are being conducted based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving-end interference elimination, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coded modulation (ACM) and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0003] In 5G systems, more different services are being considered for support compared to conventional 4G systems. For example, the most representative services may be ultra-wideband mobile communication services (enhanced mobile broadband (eMBB)), ultra-reliable low-latency communication services (ultra-reliable low-latency communication (URLLC)), massive device-to-device communication services (massive machine type communication (mMTC)), and next-generation broadcast services (evolved multimedia broadcast / multicast services (eMBMS)). A system that provides URLLC services may be referred to as a URLLC system, and a system that provides eMBB services may be referred to as an eMBB system. The terms "service" and "system" may be used interchangeably.

[0004] Compared with other services, the URLLC service is a service newly considered in the 5G system different from the conventional 4G system, and requires ultra-high reliability (e.g., about 10 -5 In order to meet such stringent requirements, URLLC services may need to apply a shorter transmission time interval (TTI) than eMBB services, and various operation schemes through applications are being considered.

[0005] The Internet (a human-centered connectivity network in which humans generate and consume information) is now evolving towards the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers. Since IoT implementation requires technical elements (such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology"), sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart appliances, and advanced medical services through the convergence and combination between existing information technology (IT) and various industrial applications.

[0006] Accordingly, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine to machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. Cloud radio access networks (RANs) as an application of the big data processing technology described above can also be considered as an example of the convergence between 5G technology and IoT technology.

[0007] According to recent developments in communication systems, research on V2X is being actively conducted in next generation mobile communication systems. In addition, research on management of a sleep mode of a secondary cell is being actively conducted.

[0008] The above information is presented as background information only to assist in understanding the present disclosure. No determination has been made and no claim is made as to whether any of the above content may be used as prior art with respect to the present disclosure. Summary of the invention

[0009] Technical issues

[0010] There is a need to exploit the current dormant state in mobile communication systems.

[0011] Solution

[0012] According to an embodiment of the present disclosure, a method performed by a terminal includes: receiving a control message from a base station to configure a secondary cell (SCell) for the terminal, the control message including first information about a first timer associated with entering sleep from an active state of the SCell and second information about a second timer associated with deactivating the SCell from a sleep state; when the SCell is in an active state, identifying that the first timer has expired; and starting a second timer of the SCell based on the identification.

[0013] According to another embodiment of the present disclosure, a method performed by a base station includes: identifying a first timer associated with entering sleep from an active state of a secondary cell (SCell) of a terminal and a second timer associated with deactivating the SCell from a sleep state; and sending a control message to the terminal to configure the SCell for the terminal, the control message including first information about the first timer and second information about the second timer, wherein when the SCell is in an active state, the expiration of the first timer is identified by the terminal, and wherein the second timer of the SCell is started based on the identification.

[0014] According to another embodiment of the present disclosure, a terminal includes: a transceiver configured to send and receive signals; and a controller configured to: receive a control message from a base station to configure a secondary cell (SCell) for the terminal, the control message including first information about a first timer associated with entering sleep from an active state of the SCell and second information about a second timer associated with deactivating the SCell from a sleep state; when the SCell is in an active state, identify that the first timer has expired; and start a second timer for the SCell based on the identification.

[0015] According to another embodiment of the present disclosure, a base station includes: a transceiver configured to send and receive signals; and a controller configured to: identify a first timer associated with entering sleep from an active state of a secondary cell (SCell) of a terminal and a second timer associated with deactivating the SCell from a sleep state; and send a control message for configuring the SCell to the terminal, the control message including first information about the first timer and second information about the second timer, wherein when the SCell is in an active state, the expiration of the first timer is identified by the terminal, and wherein the second timer of the SCell is started based on the identification.

[0016] Beneficial effects

[0017] Embodiments of the present disclosure provide a method and apparatus for allocating V2X resources in a secondary node (SN) for a UE in an RRC_IDLE state in a dual connectivity resource network.

[0018] In addition, an embodiment of the present disclosure proposes a method of converting an unused secondary cell (SCell) into a sleep mode and deactivating the SCell when a UE uses carrier aggregation (CA). Also, a method of reporting a channel state when an activated SCell is reactivated is proposed.

[0019] The technical subject matter discussed in the present disclosure may not be limited to the technical subject matter mentioned above, and other technical subject matter not mentioned may be clearly understood by those skilled in the technical field of the present disclosure through the following description.

[0020] According to an embodiment of the present disclosure, a method and apparatus for efficiently allocating V2X resources in a secondary node (SN) for a UE in an RRC_IDLE state in a dual connectivity resource network may be provided.

[0021] Furthermore, through the present disclosure, the UE can reduce the power consumption of unused SCells and reduce the power consumption caused by unnecessary channel state reports.

[0022] Effects that can be obtained by the present disclosure are not limited to the effects described above, and other effects that have not been mentioned can be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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, in which like reference numerals represent like parts:

[0024] Figure 1A An example of coverage of each of a master node (MN) and a secondary node (SN) and an example of a V2X UE in a dual connectivity installation environment including a MN base station and an SN base station according to an embodiment of the present disclosure is illustrated;

[0025] Figure 1B An example of a network structure for supporting dual connectivity and an example of a structure of a next-generation mobile communication system according to an embodiment of the present disclosure are illustrated;

[0026] Figure 1C The present invention illustrates a process in which a MN base station determines V2X resources to be used by a SN base station, notifies a connected SN base station of the determined V2X resources, and supports a V2X UE to communicate using the V2X resources of the SN base station according to an embodiment of the present disclosure;

[0027] Figure 1DA flowchart illustrating the operation of a MN base station when the MN base station determines a V2X resource to be used by an SN base station, notifies a connected SN base station of the V2X resource, and supports a V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure;

[0028] Figure 1E A flowchart illustrating the operation of an SN base station when an MN base station determines a V2X resource to be used by an SN base station, notifies a connected SN base station of the V2X resource, and supports a V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure;

[0029] Figure 1F A flowchart illustrating the operation of a V2X UE when a MN base station determines a V2X resource to be used by an SN base station, notifies a connected SN base station of the V2X resource, and supports the V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure;

[0030] Figure 1G The present invention illustrates a process in which a MN base station determines V2X resources to be used by the SN base station, notifies the connected SN base station of the V2X resources, and supports a V2X UE to communicate using the V2X resources of the SN base station when the SN base station operates in a CD-DU functional split structure according to an embodiment of the present disclosure;

[0031] Figure 1H The present invention illustrates a process in which an SN base station determines a V2X resource to be used by the SN base station, notifies a connected MN base station of the determined V2X resource, and supports a V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure;

[0032] Fig. 1I A flowchart illustrating the operation of a MN base station when the SN base station determines a V2X resource to be used by the SN base station, notifies a connected MN base station of the V2X resource, and supports a V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure;

[0033] Figure 1J A flowchart illustrating the operation of an SN base station when the SN base station determines a V2X resource to be used by the SN base station, notifies a connected MN base station of the V2X resource, and supports a V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure;

[0034] Figure 1KA flowchart illustrating the operation of a V2X UE when an SN base station determines a V2X resource to be used by the SN base station, notifies a connected NN base station of the V2X resource, and supports the V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure;

[0035] Figure 1L The present invention illustrates a process in which, when the SN base station operates in a CD-DU functional split structure according to an embodiment of the present disclosure, the SN-CU determines the V2X resources to be used by the connected SN-DU, notifies the connected MN base station of the V2X resources, and supports the V2X UE to communicate using the V2X resources of the SN base station;

[0036] Figure 1M The present invention illustrates a case where an SN base station operates in a CU-DU functional split according to an embodiment of the present disclosure, and specifically illustrates a process in which the SN-DU determines a V2X resource to be used by the SN-DU according to a request from the SN-CU and notifies the connected SN-CU of the determined V2X resource, and the SN-CU notifies the MN base station of the determined V2X resource and supports the V2X UE to communicate using the V2X resource of the SN base station;

[0037] Figure 1N The present invention illustrates a case where an SN base station operates in a CU-DU functional split according to an embodiment of the present disclosure, and specifically illustrates a process in which the SN-DU determines a V2X resource to be used by the SN-DU and notifies the connected SN-CU of the determined V2X resource, and the SN-CU notifies the MN base station of the determined V2X resource and supports the V2X UE to communicate using the V2X resource of the SN base station;

[0038] Figure 1OA An example of V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated, and Figure 1OB An example of V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated;

[0039] Figure 1PA An example of a V2X resource information element (IE) included in a message for transmitting V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated, and Figure 1PB An example of a V2X resource information element (IE) included in a message for transmitting V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated;

[0040] Figure 1Q The structure of a UE according to an embodiment of the present disclosure is illustrated;

[0041] Figure 1R The structure of a base station according to an embodiment of the present disclosure is illustrated;

[0042] Figure 2A The structure of an LTE system according to an embodiment of the present disclosure is illustrated;

[0043] Figure 2B The wireless protocol structure in LTE and NR systems according to an embodiment of the present disclosure is illustrated;

[0044] Figure 2C A downlink channel frame structure and an uplink channel frame structure when communication is performed based on a beam in an NR system according to some embodiments of the present disclosure are illustrated;

[0045] Figure 2D illustrates carrier aggregation according to an embodiment of the present disclosure;

[0046] Figure 2E illustrates a message flow between a UE and a base station / gNB when carrier aggregation is used to operate an SCell according to an embodiment of the present disclosure;

[0047] Figure 2F A flowchart illustrating an operation of a UE for managing an SCell state when the SCell is operated using carrier aggregation according to an embodiment of the present disclosure;

[0048] Figure 2G A flowchart illustrating the operation of a UE for CSI reporting when operating an SCell when using carrier aggregation according to an embodiment of the present disclosure;

[0049] Figure 2H A block diagram of a UE in a wireless communication system according to an embodiment of the present disclosure is illustrated; and

[0050] Fig.2I A block diagram of a base station in a wireless communication system according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0051] Before proceeding to the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the term "include / comprise" and its 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 within, interconnected with, containing, contained within, connected to or connected with, coupled to or coupled with, communicable with, coordinated with, interleaved, juxtaposed, proximate to, bound to or bound with, having, having the characteristics of, etc.; and the term "controller" means any device, system, or portion thereof that controls at least one operation, such device may be implemented using hardware, firmware, or software, or some combination of at least two of them. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0052] Moreover, 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, categories, instances, related data or a part thereof that are suitable for implementation in 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 disc (CD), a digital video disc (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 signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store and rewrite data later, such as rewritable optical discs or erasable memory devices.

[0053] 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.

[0054] The following discussion Figure 1A to Figure 2I The various embodiments used to describe the principles of the present disclosure in this patent document are merely illustrative 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 suitably arranged system or device.

[0055] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0056] In the following description of the present disclosure, when it is determined that the detailed description may make the subject matter of the present disclosure unclear, the detailed description of the known configuration or function incorporated herein will be omitted. This omission of unnecessary description is intended to prevent the purport of the present disclosure from being obscured and to clearly convey the purport.

[0057] For the same reason, in the drawings, some elements may be exaggerated, omitted or schematically illustrated. In addition, the size of each element does not fully reflect the actual size. In the drawings, the same or corresponding elements are provided with the same reference numerals.

[0058] The advantages and features of the present disclosure and the manner in which they are achieved will become apparent by reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the following embodiments and may be implemented in various different forms, and the embodiments of the present disclosure are provided to make the present disclosure complete and fully inform the scope of the present disclosure to those skilled in the art, and the present disclosure is limited only by the scope of the claims. Throughout this specification, the same or similar reference numerals represent the same or similar elements.

[0059] Here, it should be understood that each frame of the flowchart diagram and the combination of frames in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to the 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 component for implementing the function specified in one or more flowchart frames. These computer program instructions can also be stored in a computer-available or computer-readable memory, which can guide the computer or other programmable data processing device to play a role in a specific way, so that the instructions stored in the computer-available or computer-readable memory produce an article of instruction components including the functions specified in one or more flowchart frames. Computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps can be executed on a computer or other programmable device to produce a computer-implemented process so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flowchart frames.

[0060] And each frame of the flowchart diagram can represent a part of a module, segment or code, and the part of the module, segment or code includes one or more executable instructions for implementing (multiple) specified logical functions. It should also be noted that in some alternative embodiments, the functions mentioned in the frame may not occur in order. For example, in fact, the two frames shown in succession can be executed substantially at the same time, or these frames can sometimes be executed in reverse order, depending on the functionality involved.

[0061] 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, the meaning of "unit" is not always 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, category elements or task elements, processes, functions, characteristics, processes, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by "unit" can be combined into a smaller number of element "units" or divided into a larger number of element "units". Moreover, elements and "units" can be implemented to reproduce one or more CPUs in a device or a secure multimedia card. According to some embodiments, the term "unit" may include one or more processors.

[0062] In the following description of the present disclosure, when it is determined that the detailed description may make the subject matter of the present disclosure unclear, the detailed description of the known configuration or function incorporated herein will be omitted. The terms described below are defined in consideration of the functions in the embodiments, and the meaning of the terms may change according to the intention, convention, etc. of the user or operator. Therefore, the definition of the terms should be made based on the content throughout this specification.

[0063] In the following description, for the 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, and terms related to various identification information fragments are used. Therefore, the present disclosure is not limited to the following terms, and other terms with the same technical meaning may be used.

[0064] For ease of description, the present disclosure uses terms and names defined in the LTE and NR standards, which are the latest standards among existing communication standards defined by the 3rd Generation Partnership Project (3GPP) organization. However, the present disclosure is not limited by the terms and names, and can be equally applied to a system based on another standard. Specifically, the present disclosure can be applied to 3GPP NR, that is, the 5th generation mobile communication standard.

[0065] <Example 1>

[0066] Figure 1A An example of each of a master node (MN) and a secondary node (SN) and an example of a V2X UE in a dual connectivity installation environment including a MN base station and an SN base station according to an embodiment of the present disclosure is illustrated.

[0067] The present disclosure presents a mobile communication system in which a V2X UE 1a-100 directly communicates with another V2X UE through a V2X resource in a mobile communication network installation environment supporting dual connectivity, in which a MN base station 1a-110 and a SN base station 1a-120 are connected to each other as shown in FIG. Figure 1A Generally speaking, in a dual connectivity network installation environment, the coverage areas provided by the MN base station and the SN base station may be different, and depending on the situation, there may be an area within the coverage area of ​​the MN base station where the SN base station fails to provide services. The present disclosure may be applied to UEs capable of performing direct communication between UEs other than V2X UEs, and for the convenience of the present disclosure, the corresponding UEs are referred to as V2X UEs.

[0068] Figure 1B An example of a network structure for supporting dual connectivity and an example of a structure of a next-generation mobile communication system according to an embodiment of the present disclosure are illustrated.

[0069] In a configuration where a system supports dual connectivity, such as Figure 1B As illustrated in the figure, the MN base station 1b-200 and the SN base station 1b-300 can be connected, and one MN base station 1b-200 can be connected to multiple SN base stations 1b-300. In addition, the MN base station 1b-200 and the SN base station 1b-300 are connected to the core network 1b-100. The MN base station 1b-200 and the SN base station 1b-300 can be configured to have separate functions according to the central unit (CU) and the distribution unit (DU), and one CU can be configured to be connected to multiple DUs. The technology proposed by the present disclosure can be applied to a system environment in which only the MN base station 1b-200 and the SN base station 1b-300 exist and the SN base station 1b-300 is distributed in the SN-CU and the SN-DU, and the MN base station 1b-200 can be a single base station type or a base station type with separate functions.

[0070] The present disclosure corresponds to a technology for allowing a V2X UE 1b-400 to communicate using V2X resources in a frequency allocated to an SN base station in a dual connectivity network installation environment including an MN base station and an SN base station. To this end, a method for determining a V2X resource to be used by an SN base station, a method for transmitting the determined information to a V2X UE, and a flowchart illustrating operations of an MN base station, an SN base station, and a V2X UE therefor are provided.

[0071] A UE in an idle state in a dual connectivity network generally operates by receiving only a system information block (SIB) transmitted by a MN base station but not receiving an SIB transmitted by an SN base station. Therefore, in order to transmit a V2X service using a V2X resource of an SN base station by a V2X UE in an idle state, V2X resource information of the SN base station should be included in the SIB transmitted by the MN base station, the V2X resource of the SN base station should be determined by mutual operation between the MN base station and the SN base station, and the determined V2X resource information of the SN base station should be shared between the MN base station and the SN base station. The V2X resource may be indicated by a combination of one or more of cell ID information, frequency information, bandwidth information, time slot information, physical resource block (PRB) information, and resource element (RE) information. The SN base station considers the determined V2X resource information when performing service scheduling for serving a UE connected to the SN base station. For example, the SN base station performs scheduling in addition to the corresponding V2X resource so as to allow the V2X UE to use the corresponding V2X resource. The V2X UE transmits V2X services through the V2X resources of the SN base station after receiving the SIB including the V2X resource information of the SN base station from the MN base station.

[0072] Figure 1C An example of a process in which an MN base station determines a V2X resource to be used by an SN base station and notifies the connected SN base station of the V2X resource, and a V2X UE uses the V2X resource of the SN base station for communication according to an embodiment of the present disclosure is illustrated.

[0073] refer to Figure 1C, in step 1c-100, the MN base station determines the V2X resources to be used by the MN base station according to the V2X resource allocation policy of the MN base station configured in the MN base station through operation and management (OAM) or other methods. In step 1c-200, the MN base station broadcasts a system information block (SIB) message including the MN base station V2X resource information. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources to be used by the MN base station. In step 1c-300, the SN base station transmits information about the cell served by the SN base station to the MN base station during a process for connecting to the MN base station or a process for updating SN base station parameters. In step 1c-400, the MN base station determines the V2X resources to be used by the SN base station according to the V2X resource allocation policy of the SN base station configured in the MN base station based on the cell information provided by the SN base station through OAM or other methods. In step 1c-500, the MN base station transmits the determined V2X resource information of the SN base station to the SN base station, and at this time, the MN base station transmits the determined V2X resource to multiple SN base stations associated with the determined V2X resource. The message sent in step 1c-500 can be sent using non-UE associated signaling or UE associated signaling. In step 1c-600, the SN base station that receives the V2X resource information to be used by the SN base station from the MN base station is configured to perform scheduling considering the corresponding V2X resources when the SN base station performs scheduling for serving the UE. For example, the SN base station performs scheduling for serving the UE only through resources other than the V2X resources. In step 1c-700, the SN base station sends a response message to the MN base station in response to receiving and applying the V2X resource information. After receiving the response message from the SN base station, the MN base station broadcasts a system information block (SIB) message including the updated V2X resource information in step 1c-800. In addition, the MN base station can schedule the V2X transmission request made by the UE through the V2X resources of the SN base station. After the V2X UE recognizes the V2X resource information included in the SIB, if V2X service transmission / reception is required, the V2X UE transmits the V2X service using the V2X resources of the SN base station as required in step 1c-900. When the V2X resource information or response information is transmitted between the MN base station and the SN base station, a dedicated message for transmitting information related to the V2X resource information may be used, or the information related to the V2X resource information may be inserted into a message that has been defined for another purpose and then transmitted.

[0074] Figure 1D A flowchart illustrating the operation of the MN base station when the MN base station determines the V2X resources to be used by the SN base station, notifies the connected SN base station of the V2X resources, and supports the V2X UE to communicate using the V2X resources of the SN base station according to an embodiment of the present disclosure.

[0075] refer to Figure 1D , the MN base station determines the V2X resources to be used by the MN base station in step 1d-100, and broadcasts a SIB message including the MN base station V2X resource information in step 1d-200. The MN base station determines the V2X resources to be used by the SN based on the information about the SN base station cell received from the SN base station in step 1d-300, and sends the determined V2X resource information of the SN base station to the SN base station in step 1d-400. After receiving the response message from the SN base station in step 1d-500, the MN base station determines whether the SN base station accepts the SN base station V2X resources in step 1d-600. If the SN base station accepts the V2X resources, the MN base station adds the V2X resource information of the SN base station to the SIB message sent by the MN base station and broadcasts the SIB message to the UE in step 1d-610. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources of the SN base station. If the SN base station rejects the V2X resources in step 1d-600, the MN base station determines in step 1d-700 that the SN base station V2X resources are to be reconfigured according to the cause information included in the rejection message, and if it is determined that the SN base station V2X resources are to be reconfigured, the MN base station determines again in step 1d-710 the V2X resources to be used by the SN base station and sends the determined SN base station V2X resource information to the SN base station in step 1d-400. If it is determined in step 1d-700 that the SN base station V2X resources are not to be reconfigured, the MN base station ends configuring the SN base station V2X resources in step 1d-720.

[0076] Figure 1E A flowchart illustrating the operation of an SN base station when an MN base station determines V2X resources to be used by an SN base station, notifies a connected SN base station of the V2X resources, and supports a V2X UE to communicate using the V2X resources of the SN base station according to an embodiment of the present disclosure.

[0077] refer to Figure 1E , the SN base station receives the SN base station V2X resource information from the MN base station in step 1e-100, and determines in step 1e-200 whether there is no problem in allocating and using the SN base station V2X resources. If the SN base station determines in step 1e-200 that the V2X resource allocation is to be accepted, then in step 1e-300 the SN base station configures the scheduling in consideration of the corresponding V2X resources when performing scheduling for serving the UE. In step 1e-400, the SN base station sends an acceptance response message to the MN base station. If it is determined in step 1e-200 that the V2X resource usage configuration sent by the MN base station is to be rejected, then the SN base station sends a rejection message to the MN base station in step 1e-500.

[0078] Figure 1F A flowchart illustrating the operation of a V2X UE when a MN base station determines a V2X resource to be used by an SN base station, notifies a connected SN base station of the V2X resource, and supports the V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure.

[0079] refer to Figure 1F If the V2X UE executes a V2X application in step 1f-100, the V2X UE receives SIB information transmitted by the MN base station and identifies V2X resource information in step 1f-200. The V2X UE determines V2X resources to be used for V2X service transmission in step 1f-300 based on at least one of the V2X application, the required traffic volume, the MN base station V2X resources, the SN base station V2V resources, and another configuration policy. In addition, the V2X UE may make a request to the MN for allocation of desired V2X resources through dedicated signaling, and receive allocation of MN or SN V2X resources from the MN through dedicated signaling. If the V2X UE determines in step 1f-300 that the MN base station V2X resources are to be used, the V2X UE uses the MN base station V2X resources to transmit the V2X service in step 1f-400. If the V2X UE determines in step 1f-300 that the SN base station V2X resources are to be used, the V2X UE uses the SN base station V2X resources to transmit the V2X service in step 1f-500. If the V2X UE determines in step 1f-300 that the MN base station and SN base station V2X resources are to be used, the V2X UE uses the MN base station and SN base station V2X resources to transmit the V2X service in step 1f-600.

[0080] Figure 1G An example of a process in which, when the SN base station operates in a CD-DU functional split structure according to an embodiment of the present disclosure, a MN base station determines a V2X resource to be used by the SN base station and notifies the connected SN base station of the V2X resource, and a V2X UE uses the V2X resource of the SN base station for communication is illustrated.

[0081] refer to Figure 1G, in step 1g-100, the MN base station determines the V2X resources to be used by the MN base station according to the V2X resource allocation policy of the MN base station configured in the MN base station through operation and management (OAM) or other methods. In step 1g-150, the MN base station broadcasts a system information block (SIB) message including the MN base station V2X resource information. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources to be used by the MN base station. In step 1g-200, the SN base station transmits information about the cell served by the SN base station to the MN base station during a process for connecting to the MN base station or a process for updating SN base station parameters. In step 1g-300, the MN base station determines the V2X resources to be used by the SN base station according to the V2X resource allocation policy of the SN base station configured in the MN base station based on the cell information provided by the SN base station through OAM or other methods. In step 1g-350, the MN base station transmits the determined V2X resource information of the SN base station to the SN central unit (CU), and at this time, the determined V2X resources are transmitted to multiple SN-CUs related to the determined V2X resources. The message transmitted in step 1g-350 may be transmitted using non-UE associated signaling or UE associated signaling. The SN-CU receiving the V2X resource information to be used by the SN base station from the MN base station transmits the V2X resource information to be used by the SN to the SN distribution unit (DU) (SN-DU1 and SN-DU2) connected to the SN-CU in steps 1g-410 and 1g-420. The message transmitted in steps 1g-410 and 1g-420 may be transmitted using non-UE associated signaling or UE associated signaling. The SN-DUs (SN-DU1 and SN-DU2) receiving the SN base station V2X resource information configure scheduling in steps 1g-510 and 1g-520 in consideration of the corresponding V2X resources when the SN-DU performs scheduling for serving the UE. For example, each of SN-DU1 and SN-DU2 may perform scheduling for serving the UE only through resources other than V2X resources. SN-DU1 and SN-DU2 send response messages to the SN-CU in response to receiving and applying the V2X resource information in steps 1g-610 and 1g-620, and the SN-CU sends a response message to the MN base station in response to receiving and applying the V2X resource information in step 1g-700. After receiving the response message from the SN base station, the MN base station broadcasts a system information block (SIB) message including the updated V2X resource information in step 1g-800. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources of the SN base station.After the V2X UE identifies the V2X resource information included in the SIB, if V2X service transmission / reception is required, the V2X UE transmits the V2X service using the V2X resources of the SN base station as required in step 1g-900. Figure 1G In the embodiment illustrated in , when V2X resource information or response information is transmitted between the MN base station and the SN-CU, between the SN-CU and the SN-DU1, and between the SN-CU and the SN-DU2, a dedicated message for transmitting information related to the V2X resources may be used, or the information related to the V2X resource information may be inserted into a message already defined for another purpose and transmitted.

[0082] Figure 1H An example of a process in which an SN base station determines a V2X resource to be used by the SN base station and notifies a connected MN base station of the V2X resource, and a V2X UE uses the V2X resource of the SN base station for communication according to an embodiment of the present disclosure is illustrated.

[0083] refer to Figure 1HIn step 1h-100, the MN base station determines the V2X resources to be used by the MN base station according to the V2X resource allocation policy of the MN base station configured in the MN base station through OAM or other methods. In step 1h-150, the MN base station broadcasts a system information block (SIB) message including the V2X resource information of the MN base station. In addition, the MN base station can schedule the V2X transmission request made by the UE through the V2X resources to be used by the MN base station. In step 1h-200, the SN base station determines the V2X resources to be used by the SN base station according to the V2X resource allocation policy of the SN base station configured in the SN base station through OAM or other methods. When the SN base station performs scheduling for serving the UE in step 1h-300, the SN base station configures the scheduling considering the corresponding V2X resources. For example, the SN base station performs scheduling for serving the UE only through resources other than the V2X resources. In step 1h-400, the SN base station transmits the determined V2X resource information of the SN base station to the MN base station, and at this time, multiple SN base stations transmit the determined SN base station V2X resources to the MN base station. The message sent in step 1h-400 may be sent using non-UE-associated signaling or UE-associated signaling. The MN base station, which receives V2X resource information to be used by the SN base station from the SN base station, determines in step 1h-600 the V2X resources among the frequency resources allocated to the SN base station, which V2X resources are used outside the coverage of the SN base station. At this time, the MN base station may not allocate resources so that the V2X UE does not use the SN base station V2X resources outside the SN coverage. In step 1h-700, the MN base station broadcasts a system signal block (SIB) message including at least one of the MN base station V2X resources, the SN base station V2X resources, and the V2X resource information to be used outside the SN coverage. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources of the SN base station. After identifying the V2X resources included in the SIB, if V2X service transmission and reception are required, the V2X UE first searches or measures the SN base station if necessary in step 1h-800, and transmits the V2X service using the V2X resources of the MN base station, the V2X resources of the SN base station, and the SN V2X resources outside the coverage of the SN base station as needed in step 1h-820. When the V2X resource information or response information is transmitted between the MN base station and the SN base station, a dedicated message for transmitting the information related to the V2X resource information may be used, or the information related to the V2X resource information may be inserted into a message that has been defined for another purpose and then transmitted.

[0084] Fig. 1IA flowchart illustrating the operation of a MN base station when the SN base station determines a V2X resource to be used by the SN base station, notifies a connected MN base station of the V2X resource, and supports a V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure.

[0085] refer to Fig. 1I , the MN base station determines the V2X resources to be used by the MN base station in step 1i-100, and broadcasts a SIB message including the MN base station V2X resource information in step 1i-200. The MN base station receives the SN base station V2X resource information from the SN base station in step 1i-300, and sends a response message to the SN base station in step 1i-400. The MN base station determines the V2X resources among the frequency resources allocated to the SN base station in step 1i-500, which V2X resources are used inside the coverage area of ​​the MN base station or outside the coverage area of ​​the SN base station. In step 1i-600, the MN base station broadcasts a system signal block (SIB) message including at least one of the MN base station V2X resources, the SN base station V2X resources, and the V2X resource information to be used outside the SN coverage area. In addition, the MN base station can schedule the V2X transmission request made by the UE through the V2X resources of the SN base station.

[0086] Figure 1J A flowchart illustrating the operation of an SN base station when the SN base station determines a V2X resource to be used by the SN base station, notifies a connected MN base station of the V2X resource, and supports a V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure.

[0087] refer to Figure 1J , the SN base station determines the V2X resources to be used by the SN base station in step 1j-100. When the SN base station performs scheduling for serving the UE in step 1j-200, the SN base station considers the corresponding V2X resources to configure the scheduling. The SN base station sends the SN base station V2X resource information to the MN base station in step 1j-300 and receives a response message.

[0088] Figure 1K A flowchart illustrating the operation of a V2X UE when an SN base station determines a V2X resource to be used by the SN base station, notifies a connected MN base station of the V2X resource, and supports the V2X UE to communicate using the V2X resource of the SN base station according to an embodiment of the present disclosure.

[0089] refer to Figure 1K, if the V2X UE executes the V2X application in step 1k-100, the V2X UE receives the SIB information transmitted by the MN base station and identifies the V2X resource information in step 1k-200. In addition, the V2X UE may make a request to allocate the desired V2X resources to the MN through dedicated signaling, and receive the allocation of MN or SN V2X resources from the MN through dedicated signaling. In step 1k-300, the V2X UE searches for or measures the SN base station if necessary. The V2X UE determines in step 1k-400 the V2X resources to be used for V2X service transmission based on at least one of the SN base station search / measurement results, the V2X application, the required traffic volume, the MN base station V2X resources, the SN base station V2V resources, and another configuration policy. If the V2X UE determines in step 1k-400 that the MN base station V2X resources are to be used, the V2X UE uses the MN base station V2X resources to transmit the V2X service in step 1k-500. If the V2X UE determines in step 1k-400 that the SN base station V2X resources or the SN V2X resources outside the SN coverage are to be used, the V2X UE uses the SN base station V2X resources or the V2X resources outside the SN coverage to transmit the V2X service in step 1k-600. If the V2X UE determines in step 1k-400 that the MN base station and the SN base station V2X resources or the SNV2X resources outside the SN coverage are to be used, the V2X UE uses the MN base station and the SN base station V2X resources or the SN V2X resources outside the SN coverage to transmit the V2X service in step 1k-700.

[0090] Figure 1L The diagram illustrates an example of a process in which, when the SN base station operates in CD-DU functional split according to an embodiment of the present disclosure, the SN-CU of the SN base station determines the V2X resources to be used by the SU-DU connected to the SN-CU and notifies the connected SN-DU of the V2X resources, and the V2X UE uses the V2X resources of the SN-DU for communication.

[0091] refer to Figure 1LIn step 11-100, the MN base station determines the V2X resources to be used by the MN base station according to the V2X resource allocation policy of the MN base station configured in the MN base station through OAM or other methods. In step 11-150, the MN base station broadcasts a system information block (SIB) message including the V2X resource information of the MN base station. In addition, the MN base station can schedule the V2X transmission request made by the UE through the V2X resources to be used by the MN base station. In step 11-200, the SN-CU of the SN base station determines the V2X resources to be used by the SN base station according to the V2X resource allocation policy of the SN base station configured in the SN base station through OAM or other methods. The SN-CU transmits the determined V2X resource information to each of the SN-DUs (i.e., SN-DU1 and SN-DU2) connected to the SN-CU in steps 11-310 and 11-320. The messages sent in steps 11-310 and 11-320 may be sent using non-UE associated signaling or UE associated signaling. SN-DU1 and SN-DU2 configure scheduling in consideration of corresponding V2X resources when performing scheduling for serving UE in step 11-410 and step 11-510. For example, each of SN-DU1 and SN-DU2 may perform scheduling for serving UE only through resources other than V2X resources. SN-DU1 and SN-DU2 send response messages to the SN-CU in steps 11-510 and 11-520. In step 11-600, the SN-CU transmits the determined V2X resource information of the SN base station to the MN base station, and at this time, multiple SN base stations transmit the determined SN base station V2X resources to the MN base station. The message sent in step 11-600 may be sent using non-UE associated signaling or UE associated signaling. The MN base station sends a response message to the SN-CU in step 11-610, and determines the V2X resources in the frequency resources allocated to the SN base station in step 11-700, which are used outside the coverage of the SN base station. At this time, the MN base station may not allocate resources so that the V2X UE does not use the SN base station V2X resources outside the SN coverage. In step 11-710, the MN base station broadcasts a system signal block (SIB) message including at least one of the MN base station V2X resources, the SN base station V2X resources, and the V2X resource information to be used outside the SN coverage. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources of the SN base station.After identifying the V2X resources included in the SIB, if V2X service transmission and reception are required, the V2X UE first searches or measures the SN base station if necessary in step 11-810, and transmits the V2X service using at least one of the V2X resources of the MN base station, the V2X resources of the SN base station, and the SN V2X resources outside the coverage of the SN base station as needed in step 11-820. When V2X resource information or response information is transmitted between the MN base station and the SN-CU, between the SN-CU and the SN-DU1, and between the SN-CU and the SN-DU2, a dedicated message for transmitting information related to the V2X resource may be used, or information related to the V2X resource information may be inserted into a message already defined for another purpose and transmitted.

[0092] Figure 1M The diagram illustrates the operation of the SN base station in the CU-DU functional split structure according to an embodiment of the present disclosure. Specifically, Figure 1M The diagram illustrates an example of a process in which the SN-CU of an SN base station determines that some of the SN resources are to be used as V2X resources and makes a request for allocation of V2X resources to the SU-DU connected to the SN-CU, and the SN-DU determines the V2X resources and notifies the SN-CU of the determined V2X resources, and then the SN-CU again notifies the MN base station of the V2X resources of the SN base station, so that the V2X UE uses the V2X resources of the SN-DU for communication.

[0093] refer to Figure 1MIn step 1m-100, the MN base station determines the V2X resources to be used by the MN base station according to the V2X resource allocation policy of the MN base station configured in the MN base station through OAM or other methods. In step 1m-150, the MN base station broadcasts a system information block (SIB) message including the MN base station V2X resource information. In addition, the MN base station can schedule the V2X transmission request made by the UE through the V2X resources to be used by the MN base station. In step 1m-200, the SN-CU of the SN base station determines that some of the SN resources are to be used as V2X resources according to OAM or other triggering methods. The SN-CU makes a request for allocation of V2X resources to the SN-DU (SN-DU1 and SN-DU2) connected to the SN-CU in steps 1m-310 and 1m-320. The messages sent in steps 1m-310 and 1m-320 can be sent using non-UE associated signaling or UE associated signaling. SN-DU1 and SN-DU2 determine the V2X resources to be used by the SN-DU according to the V2X resource allocation policy of the SN base station configured in the SN-DU through OAM or other methods in step 1m-410 and step 1m-420. SN-DU1 and SN-DU2 configure scheduling in consideration of the corresponding V2X resources when performing scheduling for serving UEs in step 1l-510 and step 1l-520. For example, each of SN-DU1 and SN-DU2 may perform scheduling for serving UEs only through resources other than V2X resources. SN-DU1 and SN-DU2 send the determined V2X resource information to the SN-DU connected to the SN-CU in step 1m-610 and step 1m-620. In step 1m-700, the SN-CU transmits the determined V2X resource information of the SN base station to the MN base station, at which time, multiple SN base stations may transmit the determined SN base station V2X resources to the MN base station. The message sent in step 1m-700 may be sent using non-UE-associated signaling or UE-associated signaling. The MN base station sends a response message to the SN-CU in step 1m-710, and determines in step 1m-800 a V2X resource in the frequency resources allocated to the SN base station, which V2X resource is used outside the coverage of the SN base station. At this time, the MN base station may not allocate resources so that the V2X UE does not use the SN base station V2X resources outside the SN coverage. In step 1m-810, the MN base station broadcasts a system signal block (SIB) message including at least one of the MN base station V2X resources, the SN base station V2X resources, and the V2X resource information to be used outside the SN coverage. In addition, the MN base station may schedule a V2X transmission request made by the UE through the V2X resources of the SN base station.After identifying the V2X resources included in the SIB, if V2X service transmission and reception are required, the V2X UE first searches or measures the SN base station if necessary in step 1m-910, and transmits the V2X service using at least one of the V2X resources of the MN base station, the V2X resources of the SN base station, and the SN V2X resources outside the coverage of the SN base station as needed in step 11-920. When V2X resource information or response information is transmitted between the MN base station and the SN-CU, between the SN-CU and the SN-DU1, and between the SN-CU and the SN-DU2, a dedicated message for transmitting information related to the V2X resource may be used, or information related to the V2X resource information may be inserted into a message already defined for another purpose and transmitted.

[0094] Figure 1N The diagram illustrates the operation of the SN base station in the CU-DU functional split structure according to an embodiment of the present disclosure. Specifically, Figure 1N The diagram illustrates an example of a process in which the SU-DU of the SN base station determines V2X resources and notifies the SN-CU of the determined V2X resources, and the SN-CU notifies the MN base station of the V2X resources of the SN base station, so that the V2X UE uses the V2X resources of the SN-DU for communication.

[0095] refer to Figure 1NIn step 1n-100, the MN base station determines the V2X resources to be used by the MN base station according to the V2X resource allocation policy of the MN base station configured in the MN base station through OAM or other methods. In step 1n-150, the MN base station broadcasts a system information block (SIB) message including the MN base station V2X resource information. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources to be used by the MN base station. SN-DU1 and SN-DU2 determine the V2X resources to be used by SN-DU1 and SN-DU2 according to the V2X resource allocation policy of the SN base station configured in the SN-DU through OAM or other methods in steps 1n-210 and 1n-220. SN-DU1 and SN-DU2 configure scheduling in consideration of the corresponding V2X resources when performing scheduling for serving UEs in steps 1n-310 and 1n-320. For example, each of SN-DU1 and SN-DU2 may perform scheduling for serving UEs only through resources other than V2X resources. SN-DU1 and SN-DU2 transmit the determined V2X resource information to the SN-DU connected to the SN-CU in step 1m-410 and step 1m-420. The messages transmitted in step 1n-410 and step 1n-420 may be transmitted using non-UE associated signaling or UE associated signaling. The SN-CU transmits a response message to SN-DU1 and SN-DU2 in step 1n-510 and step 1n-520. In step 1n-600, the SN-CU transmits the determined V2X resource information of the SN base station to the MN base station, and at this time, multiple SN base stations transmit the determined SN base station V2X resources to the MN base station. The message transmitted in step 1n-600 may be transmitted using non-UE associated signaling or UE associated signaling. The MN base station transmits a response message to the SN-CU in step 1n-610, and determines a V2X resource in the frequency resources allocated to the SN base station in step 1n-700, which V2X resource is used outside the coverage of the SN base station. At this time, the MN base station may not allocate resources so that the V2X UE does not use the SN base station V2X resources outside the SN coverage. In step 1n-710, the MN base station broadcasts a system signal block (SIB) message including at least one of the MN base station V2X resources, the SN base station V2X resources, and the V2X resource information to be used outside the SN coverage. In addition, the MN base station may schedule the V2X transmission request made by the UE through the V2X resources of the SN base station.After identifying the V2X resources included in the SIB, if V2X service transmission and reception are required, the V2X UE first searches or measures the SN base station if necessary in step 1n-810, and transmits the V2X service using at least one of the V2X resources of the MN base station, the V2X resources of the SN base station, and the SN V2X resources outside the coverage of the SN base station as needed in step 1n-820. When V2X resource information or response information is transmitted between the MN base station and the SN-CU, between the SN-CU and the SN-DU1, and between the SN-CU and the SN-DU2, a dedicated message for transmitting information related to the V2X resource may be used, or information related to the V2X resource information may be inserted into a message already defined for another purpose and transmitted.

[0096] Figure 1OA An example of V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated, and Figure 1OB An example of V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated.

[0097] Figure 1OA and Figure 1OB The diagram illustrates system information block (SIB) formats 1o-100 and 1o-110, and the MN base station sends system information block (SIB) formats 1o-100 and 1o-110 together with the allocation of V2X resources to the UE, and inserts the V2X resource information required for forming SIB (e.g., SIB21 or SIB26) information into a message transmitted between the MN base station and the SN base station or between the SN-CU and the SN-DU and is transmitted.

[0098] Figure 1PA An example of a V2X resource information element (IE) included in a message for transmitting V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated, and Figure 1PB An example of a V2X resource information element (IE) included in a message for transmitting V2X resource information transmitted between a MN base station and a SN base station or between a SN-CU and a SN-DU according to an embodiment of the present disclosure is illustrated.

[0099] refer to Figure 1PA and Figure 1PB, the message for transmitting V2X resources can be configured in the following form: IE is added to a regular message used by the interface between MN BB and SN base station or between SN-CU and SN-DU, and the message can be inserted into a dedicated message for transmitting V2X resource information and then transmitted. Figure 1PA An IE configuration example 1p-110 for transmitting V2X resource information when V2X resources are allocated in units of SN or SN-DU is illustrated, and Figure 1PB The IE configuration example 1p-120 for transmitting V2X resource information when V2X resources are allocated in units of cells supported by SN or SN-DU is illustrated. The V2X resources may be indicated by a combination of one or more of cell ID information, frequency information, bandwidth information, time slot information, physical resource block (PRB) information, and resource element (RB) information.

[0100] Figure 1Q The structure of a UE according to an embodiment of the present disclosure is illustrated.

[0101] refer to Figure 1Q , the UE includes a radio frequency (RF) processing unit 1q-10, a baseband processing unit 1q-20, a storage unit 1q-30 and a controller 1e-40.

[0102] The RF processing unit 1q-10 performs functions for sending and receiving signals through a wireless channel, such as frequency band conversion and amplification of the signal. That is, the RF processing unit 1q-10 up-converts the baseband signal provided from the baseband processing unit 1q-20 into an RF band signal, and then transmits the converted signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit 1q-10 may include a transmitting filter, a receiving filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like. Although in Figure 1Q Only one antenna is shown in the figure, but the terminal may include multiple antennas. The RF processing unit 1q-10 may include multiple RF chains. Moreover, the RF processing unit 1q-10 may perform beamforming. For beamforming, the RF processing unit 1q-10 may control the phase and size of each signal sent / received through multiple antennas or antenna elements.

[0103] The baseband processing unit 1q-20 performs a function for converting between a baseband signal and a bit stream according to the physical layer standard of the system. For example, in data transmission, the baseband processing unit 1q-10 generates a composite symbol by encoding and modulating the transmission bit stream. In addition, in data reception, the baseband processor 1q-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1q-10. For example, in an orthogonal frequency division multiplexing (OFDM) scheme, when transmitting data, the baseband processing unit 1q-20 generates a composite symbol by encoding and modulating the transmission bit stream, maps the composite symbol to subcarriers, and then configures the OFDM symbol through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit 1q-20 divides the baseband signal provided from the RF processor 1q-10 in units of OFDM symbols, reconstructs the signal mapped to the subcarriers through a fast Fourier transform (FFT) operation, and then reconstructs the received bit stream through demodulation and decoding.

[0104] The baseband processing unit 1q-20 and the RF processing unit 1q-10 generally send and receive signals as described above. Therefore, the baseband processing unit 1q-20 or the RF processing unit 1q-10 can be referred to as a transmitter, a receiver, a transceiver or a communication unit. At least one of the baseband processing unit 1q-20 and the RF processing unit 1q-10 may include multiple communication modules to support a variety of different wireless access technologies. In addition, at least one of the baseband processing unit 1q-20 and the RF processing unit 1q-10 may include different communication modules to support signals of different frequency bands. For example, different wireless access technologies may include wireless LANs (e.g., IEEE 802.11) and cellular networks (e.g., LTE). In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz and 5 GHz) bands and millimeter (mm) wave (e.g., 60 GHz) bands.

[0105] The storage unit 1q-30 stores data used for the operation of the UE, such as basic programs, applications, and setting information. Specifically, the storage unit 1q-30 can store information related to a wireless LAN node that performs wireless communication using a wireless LAN access technology. In addition, the storage unit 1q-30 provides the stored data according to a request from the controller 1q-40.

[0106] The controller 1q-40 controls the overall operation of the UE. For example, the controller 1q-40 sends and receives signals through the baseband processing unit 1q-20 and the RF processing unit 1q-10. The controller 1q-40 records data in the storage unit 1q-30 and reads the data. To this end, the controller 1q-40 may include at least one processor. For example, the controller 1q-40 may include a communication processor (CP) that performs communication control and an application processor (AP) that controls a higher layer (such as an application). According to an embodiment of the present disclosure, the controller 1q-40 includes a multi-connection processing unit 1q-42, which performs processing for operations in a multi-connection mode.

[0107] The controller 1q-40 according to an embodiment of the present disclosure may operate the UE to perform V2X communication based on information configured or generated by at least one of the MN, the SN, the SN-CU, and the SN-DU.

[0108] Figure 1R A block diagram of a base station in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0109] refer to Figure 1R The base station includes an RF processing unit 1r-10, a baseband processing unit 1r-20, a backhaul communication unit 1r-30, a storage unit 1r-40 and a controller 1r-50.

[0110] The RF processing unit 1r-10 performs functions for sending and receiving signals through wireless channels, such as frequency band conversion and amplification of signals. That is, the RF processing unit 1r-10 up-converts the baseband signal provided from the baseband processing unit 1r-20 into an RF band signal, then transmits the converted signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit 1r-10 may include a transmitting filter, a receiving filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. Although Figure 1R Only one antenna is shown, but the first access node may include multiple antennas. The RF processing unit 1r-10 may include multiple RF chains. The RF processing unit 1r-10 may perform beamforming. For beamforming, the RF processing unit 1r-10 may control the phase and magnitude of each of the signals sent and received through the multiple antennas or antenna elements. The RF processing unit may perform downlink MIMO operations by sending one or more layers.

[0111] The baseband processing unit 1r-20 performs the function of converting between the baseband signal and the bit stream according to the physical layer standard of the first wireless access technology. For example, in data transmission, the baseband processing unit 1r-20 generates a composite symbol by encoding and modulating the transmission bit stream. In addition, in data reception, the baseband processor 1r-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1r-10. For example, in the OFDM scheme, when transmitting data, the baseband processing unit 1q-20 can generate a composite symbol by encoding and modulating the transmission bit stream, mapping the composite symbol to a subcarrier, and then configuring the OFDM symbol through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit 1r-20 divides the baseband signal provided by the RF processing unit 1r-10 into units of OFDM symbols, recovers the signal mapped via the subcarrier through FFT operation, and then recovers the received bit stream through demodulation and decoding. The baseband processing unit 1r-20 and the RF processing unit 1r-10 can generally send and receive signals as described above. Therefore, the baseband processing unit 1r-20 or the RF processing unit 1r-10 can be called a transmitter, a receiver, a transceiver, a communication unit or a wireless communication unit.

[0112] The backhaul communication unit 1r-30 provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit 1r-30 converts a bit stream sent from the main base station to another node (such as a secondary base station or a core network) into a physical signal, and converts a physical signal received from another node into a bit stream.

[0113] The storage unit 1r-40 stores data for the operation of the main base station, such as basic programs, applications, and setting information. Specifically, the storage unit 1r-40 can store information about the bearer assigned to the access UE and the measurement results reported from the access UE. In addition, the storage unit 1r-40 can store information as a reference for providing multiple connections to the UE or stopping the connection. The storage unit 1r-40 provides the stored data according to a request from the controller 1r-50.

[0114] The controller 1r-50 may control the overall operation of the master base station. For example, the controller 1r-50 may send and receive signals through the baseband processing unit 1r-20 and the RF processing unit 1r-10 or through the backhaul communication unit 1r-30. In addition, the controller 1r-50 records data in the storage unit 1r-40 and reads the data. To this end, the controller 1r-50 may include at least one processor. The controller 1r-50 may further include a multi-connection processing unit 1r-52 that performs processing for operations in a multi-connection mode.

[0115] <Example 2>

[0116] Figure 2A The structure of the LTE system according to an embodiment of the present disclosure is shown in FIG. Figure 2A The LTE system shown in the figure is actually the same structure.

[0117] refer to Figure 2A , the wireless communication system includes multiple base stations 2a-05, 2a-10, 2a-15 and 2a-20, a mobility management entity (MME) 2a-20 and a service gateway (S-GW) 2a-30. User equipment (hereinafter referred to as UE or terminal) 2a-35 accesses the external network through the base stations 2a-05, 2a-10, 2a-15 and 2a-20 and the S-GW 2a-30.

[0118] Base stations 2a-05, 2a-10, 2a-15 and 2a-20 provide wireless access to UE, which accesses the network as an access node of the cellular network. That is, in order to serve the user's business, base stations 2a-05, 2a-10, 2a-15 and 2a-20 perform scheduling based on collected status information (such as buffer status, available transmission power status and channel status of UE) and support the connection between UE and the core network (CN). MME 2a-25 is a device that performs functions of managing the mobility of UE and various control functions and is connected to multiple base stations, and S-GW 2a-30 is a device that provides data bearer. MME 2a-25 and S-GW2a-30 further perform authentication of UE access network and bearer management, and process packets received from base stations 2a-05, 2a-10, 2a-15 and 2a-20 or packets to be delivered to base stations 2a-05, 2a-10, 2a-15 and 2a-20.

[0119] Figure 2B The wireless protocol structure in LTE and NR systems according to an embodiment of the present disclosure is illustrated;

[0120] refer to Figure 2B, UE and eNB respectively include packet data convergence protocol (PDCP) 2b-05 and 2b-40, radio link control (RLC) 2b-10 and 2b-35, and medium access control (MAC) 2b-15 and 2b-30 in the wireless protocol of the LTE system. Packet data convergence protocol (PDCP) 2b-05 and 2b-40 perform the operation of compressing / reconstructing the IP header, and radio link control (RLC) 2b-10 and 2b-35 reconfigures the PDCP packet data unit (PDU) to have an appropriate size. MAC 2b-15 and 2b-30 are connected to various RLC layer devices included in one UE, and perform the operation of multiplexing RLC PDU to MAC PDU and demultiplexing RLC PDU from MAC PDU. The PHY layers 2b-20 and 2b-25 perform operations for channel coding and modulating higher layer data to generate OFDM symbols and transmit OFDM symbols through a radio channel or demodulating and channel decoding OFDM symbols received through a radio channel and transmitting the demodulated and channel-decoded OFDM symbols to a higher layer. In addition, the PHY layer uses hybrid ARQ (HARQ) to correct additional errors, and the receiving side transmits 1 bit of information to indicate whether a packet transmitted by the transmitting side is received. The 1 bit of information is referred to as HARQ ACK / NACK information. Downlink HARQ ACK / NACK information for uplink data transmission can be transmitted through a physical hybrid-ARQ indicator channel (PHICH) in the case of LTE, and in the case of NR, it is determined whether the downlink HARQ ACK / NACK information needs to be retransmitted through the scheduling information of the corresponding UE in the physical dedicated control channel (PDCCH) (the physical dedicated control channel is a channel in which downlink / uplink resource allocation is performed), or whether a new transmission should be performed. This is because asynchronous HARQ is applied to NR. Uplink HARQ ACK / HARQ information for downlink transmission may be sent via a physical channel such as a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). Typically, PUCCH is sent in the uplink of the PCell described below, but if the terminal supports it, the base station may additionally send PUCCH to the UE in the SCell described below, which is referred to as a PUCCH secondary cell (SCell).

[0121] Although not illustrated, there is a radio resource control (RRC) layer located above the PDCP layer of each of the UE and the base station, and the RRC layer may transmit and receive configuration control messages related to access and measurement to control radio resources.

[0122] Meanwhile, the PHY layer may include one or more frequencies / carriers, and a technique for simultaneously configuring and using multiple frequencies is called carrier aggregation (CA). CA significantly increases the transmission capacity of several secondary carriers by additionally using a primary carrier and one or more secondary carriers, which goes beyond conventional techniques in which only one carrier is used for communication between a UE (or terminal) and an E-UTRAN NodeB (eNB). Meanwhile, in LTE, a cell within a base station using a primary carrier is called a primary cell (PCell) and a cell within a base station using a subcarrier is called a secondary cell (SCell).

[0123] Figure 2C The diagram illustrates a downlink channel frame structure and an uplink channel frame structure when communication is performed based on a beam in an NR system according to an embodiment of the present disclosure.

[0124] exist Figure 2C In the embodiment, the base station 2c-01 transmits signals in the form of beams in order to transmit signals in a wider coverage area or to transmit stronger signals, as indicated by reference numerals 2c-11, 2c-13, 2c-15, and 2c-17. Therefore, the UE 2c-03 in the cell should use a specific beam ( Figure 2C Beam #1 2c-13) in the 2C-13 channel is used to send and receive data.

[0125] At the same time, the state of UE 2c-03 is divided into idle mode (RRC_IDLE) and connected mode (RRC_CONNECTED) according to whether UE 2c-03 is connected to base station 2c-01. Therefore, base station 2c-01 cannot know the location of UE 2c-03 in idle mode.

[0126] If UE 2c-03 in idle mode expects to switch to connected mode, UE 2c-03 receives synchronization signal blocks (SSBs) 2c-21, 2c-23, 2c-25, and 2c-27 transmitted by base station 2c-01. SSBs are SSB signals transmitted periodically according to a period configured by base station 2c-01, and each SSB is divided into a primary synchronization signal (PSS) 2c-41, a secondary synchronization signal (SSS) 2c-43, and a physical broadcast channel (PBCH).

[0127] Figure 2CAssume a scenario where SSB is transmitted for each beam. For example, assume that SSB#02c-21 is transmitted using beam#0 2c-11, SSB#1 2c-23 is transmitted using beam#1 2c-13, SSB#2 2c-25 is transmitted using beam#2 2c-15, and SSB#3 2c-27 is transmitted using beam#3 2c-17. Although it is assumed that UE 2c-03 in idle mode is located Figure 2C However, even when a UE in connected mode performs random access, the UE selects the SSB received at the time of performing random access.

[0128] Therefore, in Figure 2C , UE 2c-03 receives SSB#1 2c-23 transmitted through beam #1 2c-13. After receiving SSB#1 2c-23, UE 2c-03 can obtain the physical cell identifier (PCI) of base station 2c-01 through PSS and SSS and receive PBCH, thereby identifying the identifier of the currently received SSB (i.e., #1), the position of the current SSB received within the frame of 10ms, and the system frame number (SFN) of the SSB within the SFN with a period of 10.24 seconds. The PBCH may include a master information block (MIB) and provide information indicating the position of a system information block type 1 (SIB1) received through the MIB for broadcasting more detailed cell configuration information. After receiving SIB1, UE 2c-03 can know the total number of SSBs sent by base station 2c-01 and detect the position of the physical random access channel (PRACH) timing for performing random access (more specifically, sending a preamble code which is a physical signal specifically designed to perform uplink synchronization) in order to switch to the connected mode state ( Figure 2C Assume a scenario where allocation is performed every 1 ms: from 2c-30 to 2c-39). In addition, the UE can know the mapped PRACH opportunity and the SSB index to which the PRACH opportunity is mapped among the PRACH opportunities based on the information. For example, Figure 2C Assume a scenario where a PRACH opportunity is allocated every 1 ms and a scenario where each PRACH opportunity is allocated 1 / 2 SSB (i.e., 2 PRACH opportunities / SSB). Figure 2C The diagram illustrates a scenario where two RPACH opportunities are allocated per SSB starting from the PRACH opportunity starting from the SFN. That is, reference numerals 2c-30 and 2c-31 are scenarios corresponding to allocation of SSB#1 2c-21, and reference numerals 2c-32 and 2c-33 are scenarios corresponding to SSB#1 2c-23. After the PRACH opportunities are configured for all SSBs, as indicated by reference numerals 2c-38 and 2c-39, the PRACH opportunity is allocated again for the first SSB.

[0129] Therefore, UE 2c-03 identifies the positions of PRACH opportunities 2c-32 and 2c-33 for SSB#1 2c-23, and therefore, transmits a random access preamble at the fastest PRACH opportunity 2c-32 (e.g., 2c-32) among PRACH opportunities 2c-32 and 2c-33 corresponding to SSB#1 2c-23. Base station 2c-01 receives the preamble in PRACH opportunity 2c-32, and therefore knows that the corresponding UE 2c-03 selected SSB#1 2c-23 and transmitted the preamble, and therefore, transmits and receives data through the corresponding beam in the subsequent random access.

[0130] Figure 2D Carrier aggregation (CA) according to an embodiment of the present disclosure is illustrated.

[0131] refer to Figure 2D , in a base station, multiple carriers are usually sent and received through multiple frequency bands. For example, when the base station 2d-05 sends a carrier 2d-15 with a center frequency f1 and a carrier 2d-10 with a center frequency f3, a UE sends and receives data through one of the two carriers in the prior art. However, a UE 2d-30 with carrier aggregation capability can simultaneously send and receive data through multiple carriers. The base station 2d-05 can allocate more carriers to the UE 2d-30 with carrier aggregation capability according to the situation, thereby increasing the transmission rate of the UE 2d-30.

[0132] If a cell generally includes one forward carrier and one backward carrier transmitted and received by one base station, the term "carrier aggregation" can be understood as the UE simultaneously transmitting and receiving data through multiple cells. Therefore, the maximum transmission rate increases in proportion to the number of aggregated carriers.

[0133] In the following disclosed description, UE receiving data through a predetermined forward carrier or sending data through a predetermined backward carrier means sending and receiving data using a center frequency characterizing a carrier and a control channel and a data channel provided by a cell corresponding to a frequency band. Hereinafter, for ease of description, the embodiments of the present disclosure are described based on an LTE system, but the present disclosure can be applied to various wireless communication systems supporting carrier aggregation.

[0134] Among the two carriers, the cell that the UE initially accesses through random access is called PCell, and the cell added secondarily is called SCell. The SCell is added to or released from the UE through a message of the RRC layer, and if the SCell is added through RRC, the corresponding SCell is in a deactivated state. Thereafter, the UE may receive an SCell activation / deactivation MAC control element (CE) from the base station and activate or deactivate the corresponding configured cell. If the UE does not receive a schedule within a predetermined time (e.g., a timer corresponding to sCellDeactivationTimer) configured by the base station in a cell activated once, that is, if the corresponding timer expires, the corresponding SCell is deactivated.

[0135] In order to activate the deactivated SCell for communication, the base station may have a delay in detecting the channel state between the SCell and the UE, and a dormant state may be defined to reduce the delay, which is an intermediate state between the active state and the inactive state. The UE cannot send / receive data to / from the SCell in the dormant state, but can periodically report the channel state of the SCell. Therefore, if the SCell in the dormant state is activated again, the delay in communicating with the base station can be minimized.

[0136] At the same time, when the sleep state is configured or even if the sleep state is not configured, if the SCell is activated again, a method in which the UE reports the channel state according to a short period within a predetermined time and detects the channel state as soon as possible can be used. For example, after the time point (subframe n) at which the UE receives the activation command, the UE can report the channel state to the base station according to a short period set by the UE, which is from the application time point (e.g., subframe n+8) at which the activation command is processed and initially applied to the predetermined time point (e.g., subframe n+34).

[0137] Therefore, the UE can perform the following operations according to the status of the SCell.

[0138] - Actions performed in active state

[0139] *Send a sounding reference signal (SRS) to the corresponding SCell

[0140] *Send a report on the channel state of the corresponding SCell according to a short cycle and a normal / long cycle (to the PCell or PUCCH SCell) (the channel quality indicator (CQI) / precoding matrix indicator (PMI) / rank indicator (RI) / precoding type indicator (PTI) and the channel state information reference signal (CSI-RS) resource indicator (CRI) are collectively referred to as channel state information (CSI)).

[0141] *Monitor PDCCH in or for the corresponding SCell

[0142] * If PUCCH transmission can be performed in the corresponding SCell, then PUCCH is transmitted

[0143] - Perform operations in sleep mode

[0144] *Do not send a sounding reference signal (SRS) to the corresponding SCell

[0145] *Send a report on the channel status of the corresponding SCell (CQI / PMI / RI / PTI / CRI are collectively referred to as CSI) according to the sleep mode reporting period (to PCell or PUCCH SCell)

[0146] *PDCCH monitoring is not performed

[0147] * Uplink transmission is not performed in the corresponding SCell

[0148] - Perform actions in inactive state

[0149] *Send a sounding reference signal (SRS) to the corresponding SCell

[0150] *Do not send reports on the channel status of the corresponding SCell (CQI / PMI / RI / PTI / CRI are collectively referred to as CSI)

[0151] *PDCCH monitoring is not performed

[0152] * Uplink transmission is not performed in the corresponding PCell

[0153] Figure 2E A message flow between a UE and a base station when a SCell is operated using carrier aggregation according to an embodiment of the present disclosure is illustrated.

[0154] refer to Figure 2E In step 2e-11, UE 2e-01 performs configuration for connecting to base station 2e-03 by accessing base station 2e-03. The connection configuration includes the process in which UE 2e-01 performs random access to base station 2e-03, sends an RRC layer connection request message (RRCSetupRequest) to base station 2e-03, receives a connection message (RRCSetup) from base station 2e-03, and sends a confirmation message (RRCSetupComplete) to base station 2e-03.

[0155] Thereafter, in step 2e-13, the base station 2e-03 may send various configurations to the UE 2e-01 according to the capabilities of the UE 2e-01. In addition to the current PCell, the configuration may also include information about adding (or releasing) SCells. If the base station additionally configures an SCell in the UE, the base station may configure up to three cycles relative to the channel state reporting cycle of each SCell, and may configure a short cycle for activation, a long (or normal) cycle for activation, and a cycle for sending reports in a dormant state. In addition, the base station may configure a timer for state transmission of the SCell in the UE. The timer may include an sCellDeactivationTimer from an active state to an inactive state upon expiration, an sCellHibernationTimer from an active state to a dormant mode state upon expiration, and a dormantSCellDeactivationTimer from a dormant mode state to an inactive state upon expiration. After receiving the configuration message, the UE 2e-01 sends a confirmation message to the base station 2e-03 in step 2e-15. When the base station 2e-03 configures SCell, the base station may configure sCellDeactivationTimer if it does not support the sleep mode state, and may not configure sCellDeactivationTimer if it supports the sleep mode state. This is to switch the UE to idle mode if there is no data transmission / reception within a predetermined time in the active state, and then switch it to inactive mode by the base station.

[0156] At the same time, as described above, in order to activate the SCell, the base station can use the SCell activation / deactivation MAC CE message, and the base station 2e-03 can activate or deactivate the SCell configured in step 2e-13 by sending the corresponding MAC CE to the UE 2e-01 in step 2e-17. Alternatively, the base station can indicate an active state or dormant state event at the beginning through the RRC message 2e-13.

[0157] In this scenario, it is assumed that the base station 2e-03 configures the UE 2e-01 to support the SCell in the dormant state, and therefore, if the SCell is activated, the UE 2e-01 starts the configured sCellDeactivationTimer and sCellHibernationTimer in steps 2e-19 and 2e-23. As described above, in this scenario, the base station 2e-03 may not configure the sCellDeactivationTimer. In this case, the UE 2e-01 only starts the sCellHibernationTimer in step 2e-19.

[0158] Thereafter, if the UE receives resource allocation for downlink data transmission or uplink data transmission in the corresponding SCell, if the UE receives resource allocation for downlink data transmission or uplink data transmission of the corresponding SCell in another PCell / SCell, or if there is configured downlink or uplink data transmission / reception of the SCell, then UE 2e-01 restarts sCellDeactivationTimer and sCellHibernationTimer.

[0159] Thereafter, when no activity is generated in step 2e-21 and thus the sCellHibernationTimer expires, if the sCellDeactivationTimer 2e-23 is configured in the corresponding SCell, the UE 2e-01 stops the sCellDeactivationTimer in step 2e-25. If the sCellHibernationTimer has expired in step 2e-21, the UE 2e-01 starts the configured dormantSCellDeactivationTimer in step 2e-27. Therefore, the UE 2e-01 considers that the corresponding SCell is in the dormant state and reports the channel state according to the period used in the dormant state when reporting the channel state.

[0160] Thereafter, if in step 2e-29, until dormantSCellDeactivationTimer 2e-27 has expired, UE 2e-01 has not received an indication of an active state or a sleep mode state from base station 2e-03 through a SCell activation / deactivation MAC CE message (or through an RRC message), UE 2e-01 deactivates the corresponding SCell and performs the operations performed during deactivation. The operations include the contents of "operations performed in an inactive state".

[0161] At the same time, the period according to which the UE reports CSI is additionally described in detail. That is, the CSI reporting-related content described below is also applicable to the operations described above. To this end, a scenario in which the base station 2e-03 reactivates SCell 1 (deactivates according to the process) is described in step 2e-31. That is, the UE 2e-01 receives an indication of activating SCell 1 from the base station 2e-03 through the SCell activation / deactivation MAC CE in step 2e-31. At this time, it is assumed that a short CSI reporting period for activating the corresponding SCell is configured, and therefore, in step 2e-33, the UE 2e-01 reports CSI according to the short period within a predetermined time, and then reports CSI according to the long / normal period after the corresponding time. For example, the predetermined timer can be, for example, from the time point (e.g., subframe n+8) when the activation command is processed and initially applied after the time point (e.g., subframe n) of receiving the activation command to the predetermined time (e.g., subframe n+34).

[0162] In the state where SCell 1 is activated, UE 2e-01 receives an indication of (re)activating SCell 1 and activating SCell 2 from base station 2e-03 via SCell activation / deactivation MAC CE message in step 2e-41. At this time, since SCell 1 has been activated, even if a short cycle is configured, CSI is reported to base station 2e-03 according to a long / normal cycle instead of using a short cycle for reporting. However, since SCell 2 is deactivated, if short CSI is configured, UE 2e-01 sends a report according to a short cycle within a predetermined time as described above in step 2e-45.

[0163] Figure 2F A flowchart illustrating an operation of a UE for managing an SCell state when the SCell is operated by applying carrier aggregation according to an embodiment of the present disclosure.

[0164] Figure 2F Assume the situation after the UE accesses the base station and is configured to connect to the base station in step 2f-01.

[0165] Thereafter, the UE may receive various configurations from the base station through an RRC layer message in step 2f-03. In addition to the current PCell, the configuration may also include a configuration for adding (or releasing) an SCell. In addition, the configuration may also include a configuration indicating whether the base station is to use a dormant mode and an active / inactive mode for the corresponding SCell and a configuration of a timer related to the dormant mode operation. The timer may include an sCellDeactivationTimer from an active state to an inactive state upon expiration, an sCellHibernationTimer from an active state to a dormant mode state upon expiration, and a dormantSCellDeactivationTimer from a dormant mode state to an inactive state upon expiration. In order to report the channel state of each cell, the UE may receive a configuration for a CSI reporting cycle for the PCell, and in the case where the SCell is additionally configured, may receive a configuration for up to three CSI reporting cycles for each SCell. These three cycles include a short cycle used in an active state, a long (or normal) cycle used in an active state, and a cycle based on which reports are sent in a dormant state. The configuration may include initial state information of the corresponding SCell, and the base station may simultaneously configure and activate the SCell or operate the SCell in a sleep mode through the configuration.

[0166] After receiving the configuration message, the UE sends a confirmation message to the base station through an RRC layer message.

[0167] As described above, it is assumed that when the RRC layer configuration message is received from the base station, the UE can receive active mode or sleep mode as the initial state of the SCell, or the UE can receive active mode or sleep mode as the state of the SCell through a separate SCell activation / deactivation MAC CE message in step 2f-05.

[0168] If the UE receives an indication to activate the SCell from the base station, the UE starts the configured sCellDeactivationTimer and sCellHibernationTimer in step 2f-07 and performs "operations performed in the active state".

[0169] Thereafter, if the UE receives resource allocation for downlink data transmission or uplink data transmission in the corresponding SCell, if the UE receives resource allocation for downlink data transmission or uplink data transmission of the corresponding SCell in another PCell / SCell, or if there is configured downlink or uplink data transmission / reception of the SCell, the UE restarts the sCellDeactivationTimer and sCellHibernationTimer.

[0170] Thereafter, when no activity is generated in step 2f-09 and thus the sCellHibernationTimer expires, if the sCellDeactivationTimer is configured in the corresponding SCell, the UE stops the sCellDeactivationTimer. If the sCellHibernationTimer has expired, the UE starts the configured dormantSCellDeactivationTimer in step 2f-11 and performs the "operation performed in the dormant state". That is, therefore, the UE considers that the corresponding SCell is in the dormant state and reports the channel state according to the period used in the dormant state when reporting the channel state.

[0171] Thereafter, in step 2f-13, if the UE does not receive an indication of the active state or the sleep mode state from the base station through the SCell activation / deactivation MAC CE message (or through the RRC message) until the dormantSCellDeactivationTimer expires, the UE deactivates the corresponding SCell and performs the "operations performed in the inactive state" in step 2f-15.

[0172] Figure 2G A flow chart illustrating an operation of a UE for CSI reporting when operating an SCell when carrier aggregation is used according to an embodiment of the present disclosure.

[0173] Figure 2G Assume the situation after the UE accesses the base station and is configured to connect to the base station in step 2g-01.

[0174] Thereafter, the UE may receive various configurations from the base station through an RRC layer message in step 2g-03. In addition to the current PCell, the configuration may also include a configuration for adding (or releasing) an SCell. In addition, the configuration may also include a configuration indicating whether the base station is to use a dormant mode and an active / inactive mode for the corresponding SCell and a configuration of a timer related to the dormant mode operation. The timer may include an sCellDeactivationTimer from an active state to an inactive state upon expiration, an sCellHibernationTimer from an active state to a dormant mode state upon expiration, and a dormantSCellDeactivationTimer from a dormant mode state to an inactive state upon expiration. In order to report the channel status of each cell, the UE may receive a configuration for a CSI reporting cycle for the PCell, and in the case where the SCell is additionally configured, may receive a configuration for up to three CSI reporting cycles for each SCell. These three cycles include a short cycle for activation, a long (or normal) cycle for activation, and a cycle for sending reports in a dormant state. The configuration may include initial state information of the corresponding SCell, and the base station may simultaneously configure and activate the SCell or operate the SCell in a sleep mode through the configuration.

[0175] After receiving the configuration message, the UE sends a confirmation message to the base station through an RRC layer message.

[0176] As described above, it is assumed that when the RRC layer configuration message is received from the base station, the UE can receive active mode or sleep mode as the initial state of the SCell, or the UE can receive active mode or sleep mode as the state of the SCell through a separate SCell activation / deactivation MAC CE message in step 2f-05.

[0177] If the UE receives an indication to activate the SCell from the base station, if the corresponding SCell was previously operating in an inactive state or a sleep mode state in step 2g-07 and if short-cycle-based reporting is configured in the UE during activation, the UE reports CSI according to the short cycle within a predetermined time in step 2g-09. For example, the predetermined timer can be, for example, from a time point (e.g., subframe n+8) at which the activation command is processed and initially applied after the time point (e.g., subframe n) at which the activation command is received to a predetermined time (e.g., subframe n+34). After the predetermined time in step 2g-11, the UE reports CSI according to a long / normal cycle in step 2g-13.

[0178] If the UE receives an indication from the base station to activate the SCell but does not configure reporting based on a short cycle, the UE reports CSI according to a long / normal cycle in step 2g-13.

[0179] At the same time, if the UE receives an activation indication for the activated SCell again from the base station through the SCell activation / deactivation MAC CE message in step 2g-07, then the UE will report CSI according to the long / normal cycle even if the short cycle is configured in step 2g-13.

[0180] In addition, if the UE receives an indication from the base station that the SCell is operating in sleep mode, the UE reports the channel status to the base station in step 2g-15 according to the reporting period configuration information in sleep mode.

[0181] Figure 2H A block diagram of a UE in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0182] refer to Figure 2H , the UE includes a radio frequency (RF) processing unit 2h-10, a baseband processing unit 2h-20, a storage unit 2h-30 and a controller 2h-40.

[0183] The RF processing unit 2h-10 performs functions for sending and receiving signals through wireless channels, such as frequency band conversion and amplification of signals. That is, the RF processing unit 2h-10 up-converts the baseband signal provided from the baseband processing unit 2h-20 into an RF band signal, transmits the converted signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit 2h-10 may include a transmitting filter, a receiving filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like. Although in Figure 2H Only one antenna is illustrated in the figure, but the UE may include multiple antennas. The RF processing unit 2h-10 may include multiple RF chains. In addition, the RF processing unit 2h-10 can perform beamforming. For beamforming, the RF processing unit 2h-10 can control the phase and size of each of the signals sent / received through multiple antennas or antenna elements.

[0184] The baseband processing unit 2h-20 performs a function for converting between a baseband signal and a bit stream according to the physical layer standard of the system. For example, in data transmission, the baseband processing unit 2h-20 generates a composite symbol by encoding and modulating the transmission bit stream. In addition, in data reception, the baseband processing unit 2h-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 2h-10. For example, in an orthogonal frequency division multiplexing (OFDM) scheme, when transmitting data, the baseband processing unit 2h-20 generates a composite symbol by encoding and modulating the transmission bit stream, maps the composite symbol to subcarriers, and then configures the OFDM symbol through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit 2h-20 divides the baseband signal provided from the RF processor 2h-10 into units of OFDM symbols, reconstructs the signal mapped to the subcarriers through a fast Fourier transform (FFT) operation, and then reconstructs the received bit stream through demodulation and decoding.

[0185] The baseband processing unit 2h-20 and the RF processing unit 2h-10 can generally send and receive signals as described above. Therefore, the baseband processing unit 2h-20 or the RF processing unit 2h-10 can be referred to as a transmitter, a receiver, a transceiver or a communication unit. At least one of the baseband processing unit 2h-20 and the RF processing unit 2h-10 may include multiple communication modules to support a variety of different wireless access technologies. In addition, at least one of the baseband processing unit 2h-20 and the RF processing unit 2h-10 may include multiple communication modules to process signals of different frequency bands. For example, different wireless access technologies may include wireless LANs (e.g., IEEE 802.11) and cellular networks (e.g., LTE). In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz and 5 GHz) bands and millimeter (mm) wave (e.g., 60 GHz) bands.

[0186] The storage unit 2h-30 stores data for the operation of the UE, such as basic programs, applications, and setting information. Specifically, the storage unit 2h-30 can store information related to a wireless LAN node that performs wireless communication using a wireless LAN access technology. The storage unit 2h-30 provides the stored data according to a request from the controller 2h-40.

[0187] The controller 2h-40 controls the overall operation of the UE. For example, the controller 2h-40 sends and receives signals through the baseband processing unit 2h-20 and the RF processing unit 2h-10. In addition, the controller 2h-40 records data in the storage unit 2h-40 and reads the data. To this end, the controller 2h-40 may include at least one processor. For example, the controller 2h-40 may include a communication processor (CP) that performs communication control and an application processor (AP) that controls a higher layer (such as an application). According to an embodiment of the present disclosure, the controller 2h-40 includes a multi-connection processing unit 2h-42, which performs processing for operating in a multi-connection mode. For example, the controller 2h-40 can control the UE to perform operations corresponding to Figure 2E , Figure 2F as well as Figure 2G The process of operation of the UE illustrated in FIG.

[0188] According to an embodiment of the present disclosure, the controller 2h-40 performs activation / idle mode / deactivation operations in the SCell configured according to an indication to the base station, and performs operations for indicating status transmission.

[0189] Fig.2I A block diagram of a base station in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0190] refer to Fig.2I The base station includes an RF processing unit 2i-10, a baseband processing unit 2i-20, a backhaul communication unit 2i-30, a storage unit 2i-40 and a controller 2i-50.

[0191] The RF processing unit 2i-10 performs functions for sending and receiving signals through a wireless channel, such as frequency band conversion and amplification of the signal. That is, the RF processing unit 2i-10 up-converts the baseband signal provided from the baseband processing unit 2i-20 into an RF band signal, transmits the converted signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit 2i-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. Although Fig.2I Only one antenna is shown, but the first access node may include multiple antennas. The RF processing unit 2i-10 may include multiple RF chains. The RF processing unit 2i-10 may perform beamforming. For beamforming, the RF processing unit 2i-10 may control the phase and magnitude of each of the signals sent and received through multiple antennas or antenna elements. The RF processing unit may perform downlink MIMO operations by sending one or more layers.

[0192] The baseband processing unit 2i-20 performs the function of converting between the baseband signal and the bit stream according to the physical layer standard of the first wireless access technology. For example, in data transmission, the baseband processing unit 2i-20 generates a composite symbol by encoding and modulating the transmission bit stream. In addition, in data reception, the baseband processing unit 2i-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 2i-10. For example, in the OFDM scheme, when sending data, the baseband processing unit 2i-20 can generate a composite symbol by encoding and modulating the transmission bit stream, mapping the composite symbol to a subcarrier, and then configuring the OFDM symbol through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit 2i-20 divides the baseband signal provided by the RF processing unit 2i-10 into units of OFDM symbols, recovers the signal mapped to the subcarrier through FFT operation, and then recovers the received bit stream through demodulation and decoding. The baseband processing unit 2i-20 and the RF processing unit 2i-10 generally transmit and receive signals as described above. Therefore, the baseband processing unit 2i-20 or the RF processing unit 2i-10 can be referred to as a transmitter, a receiver, a transceiver, a communication unit or a wireless communication unit.

[0193] The backhaul communication unit 2i-30 provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit 2i-30 converts the bit stream sent from the main base station to another node (such as a secondary base station or a core network) into a physical signal, and converts the physical signal received from another node into a bit stream.

[0194] The storage unit 2i-40 stores data for the operation of the main base station, such as basic programs, applications, and setting information. Specifically, the storage unit 2i-40 can store information about the bearer assigned to the access UE and the measurement results reported from the access UE. In addition, the storage unit 2i-40 can store information as a reference for determining whether to provide multiple connections to the UE or stop the connection. The storage unit 2i-40 provides the stored data according to a request from the controller 2i-50.

[0195] The controller 2i-50 controls the overall operation of the master base station. For example, the controller 2i-50 sends and receives signals through the baseband processing unit 2i-20 and the RF processing unit 2i-10 or through the backhaul communication unit 2i-30. The controller 2i-50 records data in the storage unit 2i-40 and reads data. To this end, the controller 2i-50 may include at least one processor.

[0196] The methods according to the embodiments stated in the claims and / or the specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0197] When the method is 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 may be configured for execution by one or more processors in an electronic device. At least one program may include instructions for causing an electronic device to perform a method according to various embodiments of the present disclosure as defined by the appended claims and / or disclosed herein.

[0198] The program (software module or software) may be stored in a non-volatile memory (including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage device, compact disk ROM (CD-ROM), digital versatile disk (DVD) or other type of optical storage device, or magnetic tape cassette). Alternatively, any combination of some or all of them may form a memory storing the program. In addition, a plurality of such memories may be included in an electronic device.

[0199] In addition, the program can be stored in an attachable storage device that can access the electronic device through a communication network (such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), and a storage area network (SAN) or a combination thereof). Such a storage device can access the electronic device via an external port. In addition, a separate storage device on a communication network can access the portable electronic device.

[0200] In the detailed embodiments described above of the present disclosure, the components included in the present disclosure are represented in singular form or plural form according to the detailed embodiments presented. However, for ease of description, the singular form or plural form suitable for the presented situation is selected, and the various embodiments of the present disclosure are not limited to a single element or multiple elements. In addition, multiple elements described in the specification can be configured as a single element, or a single element in the specification can be configured as multiple elements.

[0201] Although the present disclosure has been described with various embodiments, various changes and modifications may occur to those 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 comprising: Receiving configuration information of a secondary cell SCell from a base station, the configuration information including information about a sleep timer of the SCell and information about a period of reporting channel state information CSI, wherein the period includes a first period and a second period; Identify whether the SCell is in an activated state; When the SCell is in an activated state, starting a sleep timer, wherein the CSI report is performed based on the first period or the second period; When the sleep timer expires, the SCell enters the sleep state; Receive an activation command of the SCell from the base station; Entering an activation state based on an activation command; and Perform CSI reporting based on the second period, Among them, the second cycle is longer than the first cycle. 2 . The method of claim 1 , further comprising performing CSI reporting on the SCell during a dormant state.

3. The method according to claim 1, further comprising: Deactivate the SCell based on the expiration of the dormant SCell deactivation timer; and Based on the expiration of the dormant SCell deactivation timer, stop the dormant SCell deactivation timer, The configuration information includes information about a dormant SCell deactivation timer.

4. The method according to claim 1, wherein: The configuration information includes information about the SCell deactivation timer, and When the SCell is in an activated state, when an uplink grant or a downlink allocation is received on the SCell, the dormancy timer and the SCell deactivation timer are restarted.

5. A method performed by a base station in a wireless communication system, the method comprising: Sending configuration information of the secondary cell SCell to the terminal, the configuration information including information about a sleep timer of the SCell and information about a period of reporting channel state information CSI, wherein the period includes a first period and a second period; When the terminal is in a dormant state for the SCell, an activation command for the SCell is sent to the terminal. When the SCell is in an activated state, the CSI report is performed based on the first period or the second period. When the SCell is in the activated state, the sleep timer is started. When the sleep timer expires, the terminal enters the sleep state for the SCell, and In which, when the SCell is in an activated state based on the activation command, the CSI report is performed based on a second period that is longer than the first period.

6. The method according to claim 5, in, During the dormant state, CSI reporting is performed on the SCell.

7. The method according to claim 5, wherein: Based on the expiration of the dormant SCell deactivation timer, the SCell is deactivated. wherein, based on the expiration of the dormant SCell deactivation timer, the dormant SCell deactivation timer is stopped, and The configuration information includes information about a dormant SCell deactivation timer.

8. A terminal in a wireless communication system, the terminal comprising: a transceiver configured to transmit and receive signals; as well as Controller, configured as: receiving configuration information of a secondary cell SCell from a base station, the configuration information including information about a sleep timer of the SCell and information about a period of a channel state information CSI report, wherein the period includes a first period and a second period, Identify whether SCell is in an active state. When the SCell is in an activated state, a sleep timer is started, wherein the CSI report is performed based on the first period or the second period, When the sleep timer expires, the SCell enters the sleep state. Receive the SCell activation command from the base station, Entering the active state based on an activation command, and Perform CSI reporting based on the second period, Among them, the second cycle is longer than the first cycle.

9. The terminal according to claim 8, wherein: The controller is further configured to perform CSI reporting on the SCell during the sleep state.

10. The terminal according to claim 8, wherein: The controller is also configured to: Deactivating the SCell based on expiration of the dormant SCell deactivation timer; and Based on the expiration of the dormant SCell deactivation timer, the dormant SCell deactivation timer for the SCell is stopped.

11. The terminal according to claim 8, wherein: The configuration information includes information about the SCell deactivation timer, and When the SCell is in an activated state, when an uplink grant or a downlink allocation is received on the SCell, the dormancy timer and the SCell deactivation timer are restarted.

12. A base station in a wireless communication system, the base station comprising: a transceiver configured to transmit and receive signals; and Controller, configured as: Sending configuration information of a secondary cell SCell to a terminal, the configuration information including information about a sleep timer of the SCell and information about a period of a channel state information CSI report, wherein the period includes a first period and a second period, When the terminal is in a dormant state for the SCell, an activation command for the SCell is sent to the terminal. When the SCell is in an activated state, the CSI report is performed based on the first period or the second period. When the SCell is in the activated state, the sleep timer is started. When the sleep timer expires, the terminal enters the sleep state for the SCell. In which, when the SCell is in an activated state based on the activation command, the CSI report is performed based on a second period that is longer than the first period.

13. The base station according to claim 12, wherein: During the dormant state, CSI reporting is performed on the SCell.

14. The base station according to claim 12, in, Based on the expiration of the dormant SCell deactivation timer, the SCell is deactivated. wherein, based on the expiration of the dormant SCell deactivation timer, the dormant SCell deactivation timer is stopped, and The configuration information includes information about a dormant SCell deactivation timer.

15. The base station according to claim 12, wherein: The configuration information includes information about the SCell deactivation timer, and When the SCell is in an activated state, when an uplink grant or a downlink allocation is received on the SCell, the dormancy timer and the SCell deactivation timer are restarted.

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