Method and device for sending and receiving data in wireless communication system

Abstract

Various embodiments of the present disclosure relate to a method and apparatus for sending and receiving data in a wireless communication system. According to one embodiment of the present disclosure, a method for a terminal to send a power headroom report (PHR) in a wireless communication system may include the following steps: receiving signaling information including at least one indicator indicating a PHR report of at least one cell for dual connectivity operation; and sending at least one PHR corresponding to the at least one indicator for the at least one cell. At least one cell is a primary cell (Pcell) serving a user equipment and / or a primary secondary cell (PScell) serving a user equipment.

Description

[0001] This application is a divisional application of an invention patent application with an application date of September 20, 2018, application number 201880073146.5, and invention name “Method and device for sending and receiving data in a wireless communication system”. Technical Field

[0002] The present disclosure relates to a method for transmitting and receiving data in a wireless communication system, and more particularly, to a method and apparatus for performing cell reselection by considering slices in a wireless communication system.

[0003] The present disclosure relates to a method and apparatus for solving the overheating problem of user equipment in a wireless communication system.

[0004] The present disclosure relates to methods and apparatus for activating and deactivating cells in a wireless communication system.

[0005] The present disclosure relates to a method and apparatus for indicating a power headroom report in a wireless communication system. Background Art

[0006] In order to meet the growing demand for wireless data traffic since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "beyond 4G networks" or "post-LTE systems."

[0007] It is believed that 5G communication systems will be implemented in millimeter wave (mmWave) frequency bands (e.g., 60GHz band) to achieve higher data rates. In order to reduce the propagation loss of wireless waves and increase the transmission distance, beamforming technology, massive multiple-input multiple-output (MIMO) technology, full-size MIMO (FD-MIMO) technology, array antenna technology, analog beamforming technology, and massive antenna technology are discussed in 5G communication systems.

[0008] In addition, in 5G communication systems, system network improvement development based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc. is underway.

[0009] In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM) schemes, and filter bank multi-carrier (FBMC) schemes, orthogonal multiple access (NOMA) schemes, and sparse code multiple access (SCMA) schemes have been developed as advanced access technologies.

[0010] 5G network technology aims to follow up on 4G LTE mobile communication technology by implementing an end-to-end (E2E) system that connects all objects (e.g., a technology, a domain, a layer, an instrument / device, user interaction, and / or, etc.) that access the network through various wireless methods as well as wired methods. To this end, standard organizations such as ITU-R, ITU-T, NGMN, 3GPP, etc. have been designing systems and network structures on a brand-new platform to implement wireless and wired network technologies with high performance, low latency, high availability, and / or, etc.

[0011] The Internet is a human-centric connected network where people can generate and consume information. It is now developing into the Internet of Things (IoT), in which distributed entities (such as electronic devices, home appliances, etc.) can exchange and process information without human intervention. The Internet of Everything (IoE) is a combination of IoT technology and big data processing technology. IoE emerges through connection with cloud servers.

[0012] Since the implementation of IoT 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. are under research.

[0013] Such an IoT environment can provide intelligent Internet technology (IT) 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, healthcare, smart appliances, and advanced medical services, through the integration and combination between existing IT and various industrial applications.

[0014] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, 5G communication technologies such as beamforming, MIMO, array antennas, etc. have been used to implement technologies such as sensor networks, machine-to-machine communications, MTC, etc. The case where the cloud wireless access network as described above is used as a big data processing technology can be an example of the fusion of 5G technology and IoT technology.

[0015] The above information is presented as background information only to assist with understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0016]

Technical issues

[0017] The present disclosure relates to a method and apparatus for providing priority information so that a user equipment can reselect a cell by considering a slice on which the user equipment is registered or supported by the user when reselecting a cell.

[0018] The present disclosure relates to a method and apparatus for processing capability information of a user equipment in order to mitigate the problem of overheating of a communication modem chipset due to configuration related to high performance transmission.

[0019] The present disclosure relates to a method and apparatus for activating and deactivating each cell in the case of aggregating and using cells having a plurality of transmission time units.

[0020] The present disclosure relates to a method and apparatus for reporting multiple types of power headrooms when multiple types of uplink transmission technologies are used.

[0021]

Technical solution

[0022] According to an embodiment of the present disclosure, a method for selecting a cell by a base station may include: receiving information about a first slice of each of a plurality of frequencies that can be supported; receiving information about a slice in which a user equipment is registered or information about a second slice supported by the user equipment, generating frequency priority information based on the information about the first slice and the information about the second slice, and sending the priority information to the user equipment.

[0023] According to another embodiment of the present disclosure, a method for applying a configuration of a user equipment may include: receiving configuration information for solving an overheating problem from the user equipment; generating reconfiguration information based on a message including the configuration information; and sending the reconfiguration information to the user equipment.

[0024] According to another embodiment of the present disclosure, a method for activating operations in a user equipment may include: receiving a message including a configuration for adding a secondary cell (SCell) from a base station, receiving a message for activating the secondary cell, determining a time point for performing the secondary cell operation based on a time slot length of a primary cell (PCell) and a time slot length of the secondary cell, and performing the operation at the time point.

[0025] At the same time, the method for the user equipment to send power headroom may include: receiving parameters for sending power headroom from the base station; determining whether the power headroom triggering standard is met based on the parameters; if the standard is met, generating power headroom based on the parameters, and sending the power headroom to the base station.

[0026] [Effects of the invention]

[0027] Embodiments of the present disclosure may provide cell reselection priority information so that a user equipment may reselect a cell by considering a registered user equipment or a slice supported by the user equipment.

[0028] Embodiments of the present disclosure may alleviate the problem of overheating of a communication modem chipset of a user equipment due to configurations related to high performance transmissions.

[0029] In case of aggregating and using cells with multiple transmission time units, embodiments of the present disclosure may activate and deactivate each cell.

[0030] In case of using multiple types of uplink transmission technologies, embodiments of the present disclosure may report multiple types of power headrooms.

[0031] Effects of various embodiments of the present disclosure are not limited to the effects described above, and temporary effects expected according to technical features of the present disclosure will be clearly understood from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other aspects, features and advantages of certain exemplary embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0033] Figure 1 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure;

[0034] Figure 2 is a diagram for describing a process of applying priority information of each frequency for cell reselection to a user equipment in a wireless communication system according to an embodiment of the present disclosure;

[0035] Figure 3 is a diagram for describing a process in which a base station receives slice information from a user equipment according to an embodiment of the present disclosure;

[0036] Figure 4 is a diagram for describing a process of providing information related to a specific user equipment from a core network to a base station according to an embodiment of the present disclosure;

[0037] Figure 5 is a diagram for describing the operation of a base station according to an embodiment of the present disclosure;

[0038] Figure 6 is a block diagram showing the structure of a user equipment according to an embodiment of the present disclosure;

[0039] Figure 7 is a diagram showing a structure of a master base station in a wireless communication system according to an embodiment of the present disclosure;

[0040] Figure 8 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure;

[0041] Fig. 9is a diagram showing a signal flow related to an operation for solving an overheating problem of a user equipment according to an embodiment of the present disclosure;

[0042] Fig.10 is a diagram for describing an operation of a base station for processing UE category information transmitted from a user equipment according to an embodiment of the present disclosure;

[0043] Fig.11 is a diagram for describing a method for generating a UEAssistanceInformation message in an LTE-NR dual connectivity (DC) technology according to an embodiment of the present disclosure;

[0044] Fig.12 is a diagram showing a structure of a user equipment according to an embodiment of the present disclosure;

[0045] Fig.13 is a diagram showing a structure of a master base station in a wireless communication system according to an embodiment of the present disclosure;

[0046] Fig.14 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure;

[0047] Fig.15 is a diagram showing a structure of a wireless protocol in a wireless communication system according to an embodiment of the present disclosure; and

[0048] Fig.16 is a diagram for describing a carrier aggregation technology in a user equipment according to an embodiment of the present disclosure;

[0049] Fig.17 is a diagram showing a frame structure of a wireless communication system according to an embodiment of the present disclosure;

[0050] Fig.18 is a diagram for describing transmission and reception of messages between a user equipment and a base station according to an embodiment of the present disclosure;

[0051] Figure 19a-Figure 19c is a diagram showing a time point at which a SCell is activated / deactivated according to an embodiment of the present disclosure;

[0052] Fig. 20 is a diagram for describing a method for a user equipment to perform activation and deactivation according to an embodiment of the present disclosure;

[0053] Fig.21 is a diagram showing a structure of a user equipment in a wireless communication system according to an embodiment of the present disclosure;

[0054] Fig. 22 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure;

[0055] Fig.23 is a diagram showing a frame structure of a wireless communication system according to an embodiment of the present disclosure;

[0056] Fig.24 is a diagram for describing a carrier aggregation technology in a user equipment according to an embodiment of the present disclosure;

[0057] Fig.25 is a diagram illustrating dual connectivity (DC) in LTE and NR according to an embodiment of the present disclosure;

[0058] Fig.26 is a diagram for describing an uplink transmission method according to a configuration and an uplink type according to an embodiment of the present disclosure;

[0059] Fig. 27 is a diagram for describing transmission and reception of messages between a user equipment and a base station according to an embodiment of the present disclosure;

[0060] Fig.28 is a flowchart for describing a method for sending a PHR in a user equipment according to an embodiment of the present disclosure; and

[0061] Fig.29 is a diagram illustrating a structure of a user equipment in a wireless communication system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0062] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these specific details are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and configurations may be omitted for clarity and brevity.

[0063] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0064] Although ordinals such as "first," "second," and the like will be used to describe various components, these components are not limited thereto. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the present inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0065] The terms used herein are for the purpose of describing various embodiments only and are not intended to be limiting. As used herein, the singular form is also intended to include the plural form, unless the context clearly indicates otherwise. It will also be understood that when used in this specification, the terms "including" and / or "having" specify the presence of the stated features, quantities, steps, operations, components, elements, or combinations thereof, but do not exclude the presence or increase of one or more other features, quantities, steps, operations, components, elements, or combinations thereof.

[0066] The terms used herein, including technical and scientific terms, have the same meaning as those commonly understood by those skilled in the art, as long as these terms are not defined differently. It should be understood that the terms defined in general dictionaries have the same meaning as those in the relevant art.

[0067] A base station is the entity that communicates with a user equipment and may be referred to as a BS, NodeB (NB), eNodeB (eNB), gNodeB (gNB), access point (AP), etc.

[0068] The user equipment is a subject that communicates with the base station and may be referred to as UE, mobile station (MS), mobile equipment (ME), device, terminal, etc.

[0069] For the convenience of description, the terms used in the following description to identify access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are all examples. Therefore, the present disclosure is not limited to the terms described below, and different terms referring to objects having the same technical meaning may be used.

[0070] For ease of description, the present disclosure uses the latest terms and terminology defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard in the current communication standard. However, the present disclosure is not limited to the terms and terminology vocabulary, and can be applied to systems that follow other standards in the same manner. The present disclosure can be applied to 3GPP New Radio (NR), which is a standard for fifth-generation mobile communications.

[0071] Hereinafter, various embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0072] Figure 1 2 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure. Figure 1 , the wireless communication system 10 includes a first base station gNB1 110 in the core network, a second base station gNB2 130, a first AMF AMF1 105 and a second AMF AMF2 125, and a user equipment new wireless user equipment 115 (hereinafter, "NR UE" or user equipment). At this time, gNB1 110 and gNB2 130 can be base stations of the fifth generation mobile communication standard and can be connected to at least one of the first AMF 105 or the second AMF 125 in the core network. The user equipment 115 can access the external network through the wireless communication system 10.

[0073] gNB1 110 and gNB2 130 may be components corresponding to an evolved Node B (eNB) of an existing LTE system. gNB1 110 and gNB2 130 are connected to NR UE 115 through a wireless channel and may provide excellent services compared to existing eNBs. In particular, in the fifth generation wireless communication system, all user services are served through a shared channel, so a device is required to collect the buffer status, available transmission power status, channel status, etc. of the UE to perform scheduling, which is the responsibility of the gNB. One gNB may generally control multiple cells. In order to achieve high-speed data transmission compared to the existing LTE, the gNB may have a bandwidth greater than or equal to the existing maximum bandwidth, and beamforming technology may be added together with an orthogonal frequency division multiplexing (OFDM) scheme as a wireless access technology. In addition, the gNB applies an adaptive modulation and coding (AMC) scheme, in which the modulation scheme and the channel coding rate are determined according to the channel state of the user equipment.

[0074] AMF1 105 and AMF2 125 are components for performing a function of supporting mobility, a function of establishing a bearer, a function of configuring QoS, etc. AMF1 105 and AMF2 125 are devices responsible for various control functions and a function of managing the mobility of a user equipment, and can be connected to multiple base stations. AMF1 105 and AMF2 125 can provide services optimized for specific slices.

[0075] At this time, a slice refers to a concept for providing a service optimized for a specific service or a specific user equipment group. For example, the demand for the fifth mobile communication is classified into ultra-high-speed data transmission (e.g., enhanced mobile broadband (eMBB)), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC). At this time, there may be a slice corresponding to each demand. For example, if the user equipment 115 intends to receive the service through the first slice corresponding to a specific service, the user equipment 115 can request to be connected to a suitable specific AMF1105 through gNB1 110. Alternatively, gNB1 110 can select AMF1 105 by considering the service requested by the user equipment 115.

[0076] Figure 2 is a diagram for describing a process in which priority information per frequency for cell reselection is applied to a user equipment in a wireless communication system according to an embodiment of the present disclosure.

[0077] More specifically, Figure 2 The diagram is used to describe a process of applying the priority information of each frequency for cell reselection to a user equipment by broadcasting the priority information of each frequency for cell reselection through SIB or through an RRC connection release message as dedicated RRC signaling in a wireless communication system according to an embodiment of the present invention. At this time, cell reselection refers to a process for reselecting a serving cell so that a user equipment in motion can be connected to a cell with the best channel state.

[0078] The network can assign a priority to each frequency in idle mode to control the cell reselection of the user equipment. For example, if the user equipment receives priority information of two frequencies f1 and f2, and the priority of f1 is higher than that of f2, the possibility that the user equipment is in f1 becomes higher. Even if the user equipment is in f2, if the channel state of f2 is not good, the user equipment can still try to change to f1. The priority information of the frequency can be provided to the user equipment through a broadcast SIB or an RRC connection release message as a dedicated RRC signaling. Even if the user equipment has priority information of the frequency through the SIB, when the user equipment receives UE-specific priority information through RRC signaling, the priority information through the SIB can be ignored. For example, the priority information of each frequency is transmitted through the CellReselectionPriority IE (cell reselection priority IE) in Table 1, and one of a total of 8 levels of priority is assigned to the user equipment. If the value is smaller, it means that the priority is lower. That is, "0" indicates the lowest priority.

[0079]

Table 1

[0080]

[0081] The same priority may not be assigned to frequencies between RATs. If the idle state of the user equipment is "camped on any cell state", the user equipment applies the frequency priority information received through the SIB and stores the priority information received through the RRC signaling without using the priority information received through the RRC signaling. The CellReselectionPriority IE is an optional IE, so the CellReselectionPriority IE may not exist. In this case, no priority information of the corresponding frequency is assigned. At this time, the user equipment considers that the priority of the corresponding frequency is the lowest level. Refer to Figure 2 In operation 200, the user equipment receives priority information of frequencies used in other RATs and EUTRA through the SIB. However, priority information of all frequencies does not necessarily have to be provided. In addition, priority information of the frequency where the user equipment resides may not be provided.

[0082] The user equipment checks the received priority information in operation 205. If the priority information about the frequency of the current serving cell is not provided, then in operation 210, the user equipment considers that the priority of the frequency is the lowest level.

[0083] In operation 215, the user equipment applies the priority information of each frequency. Upon receiving the RRC connection release message from the base station, the user equipment changes from the connected mode to the idle mode. The RRC message may include the priority information of the frequency. The priority information included in the RRC message is UE-specific information and may be preferentially applied compared to the frequency priority information provided through the SIB.

[0084] In operation 220, the user equipment may check whether frequency priority information is included in the received RRC message. If the priority information exists, in operation 225 the user equipment applies the included T320 value together with the priority information to drive a timer.

[0085] In operation 230, the user equipment determines whether the current idle mode state is "camped on any cell state" or "camped on normal state". At this time, "camped on normal state" means that the user equipment camps on a suitable cell. A suitable cell is a cell that can provide normal services and meets the following detailed criteria.

[0086] - The cell corresponds to a selected PLMN, a registered PLMN or a PLMN in the equivalent PLMN list

[0087] - Non-prohibited communities

[0088] - Cells that meet the cell selection criteria

[0089] - In case of a Closed Subscriber Group (CSG) cell, a cell whose CSG ID is in the whitelist of the user equipment.

[0090] "Camped on any cell state" refers to a state in which the user equipment camps on an acceptable cell because the user equipment cannot camp on a suitable cell. In an acceptable cell, normal service is not possible and the user equipment can attempt an emergency call. An acceptable cell is a cell that satisfies the following conditions.

[0091] - Non-prohibited neighborhoods.

[0092] -Cells that meet the cell selection criteria.

[0093] If the user equipment is in the idle state of "camped on any cell state", the user equipment returns to operation 215 and applies the frequency priority information provided by the SIB instead of the priority information provided by the RRC connection release message. If the user equipment is in the idle state of "normal camping", the user equipment determines at least one of the following three criteria in operation 235. The three criteria are as follows.

[0094] - The user device switches to connected mode

[0095] -T320 timer expires

[0096] -Perform PLMN selection process based on NAS request

[0097] If at least one of the three criteria is satisfied, the user equipment discards the priority information provided through the RRC connection release message in operation 240 and returns to operation 215 to apply the frequency priority information provided through the SIB.

[0098] If any of the three criteria is not satisfied, then in operation 245, the user equipment applies the priority information provided through the RRC connection release message.

[0099] At the same time, when measuring a specific frequency, the user equipment may be affected by the frequency priority information. More specifically, the user equipment always performs measurement on a frequency whose priority is higher than that of the current serving cell. However, in order to save power, the user equipment does not always perform measurement on the same frequency as the serving cell (intra-frequency) or a frequency whose priority is lower than or equal to that of the serving cell. When the channel QoS of the serving cell is less than or equal to a specific threshold, the user equipment performs frequency measurement on the same frequency as the serving cell (intra-frequency) or a frequency whose priority is lower than or equal to that of the serving cell. Cell reselection is performed to move to a cell with a good channel state. If the channel QoS of the serving cell is good, there is no need to move to a frequency whose priority is lower than or equal to that of the serving cell. Therefore, the user equipment can determine whether to perform measurement based on a specific threshold in order to reduce power consumption due to unnecessary channel measurement. In the case of the same frequency (intra-frequency), if the QoS of the serving cell is less than or equal to a specific threshold S intrasearch , the user equipment performs channel measurement for other cells of the same frequency. For other frequencies whose priority is less than or equal to the priority of the serving cell, if the QoS of the serving cell is less than or equal to a specific threshold S nonintrasearch , the user equipment performs channel measurement on other cells of other frequencies. For example, RSRP and RSRQ can be regarded as channel QoS.

[0100] If, while performing the measurement in the above scheme, the channel QoS of the cell with the high priority frequency is greater than a specific threshold Thresh X-high , the user equipment reselects the cell with a high priority frequency as the service unit. If the channel QoS of the cell with a low priority frequency is greater than a specific threshold Thresh X-low , and the QoS of the serving cell is less than Thresh Serving-low , the user equipment reselects a cell with a lower frequency priority as the serving unit.

[0101] In the fifth generation wireless communication system, the concept of slicing is introduced, so it is necessary to consider the slices during cell reselection. That is, the user equipment is required to reselect the cell by considering the slices on which the user equipment is registered or supported by the user equipment. This is because the following problem may occur: if the slice is not considered when reselecting the cell, the user equipment sets up a connection with a specific cell and then redirects to a cell that supports the appropriate specific slice. If the user equipment resides on a cell that supports the slice in which the user equipment is registered or the slice pre-supported by the user equipment, the user equipment does not need to perform a redirection operation. Therefore, the base station according to an embodiment of the present disclosure can provide cell reselection priority information so that a specific user equipment can reselect the cell by considering the slice supported by the dedicated RRC at which the user equipment is registered or the user equipment uses when the dedicated RRC is converted from connected mode to idle mode. It is necessary for the base station to collect information about all slices supported by the registered user equipment or the user equipment before sending dedicated RRC signaling. In an embodiment of the present disclosure, the base station can receive information from the user equipment or the core network.

[0102] Figure 3 It is a diagram for describing a process in which a base station receives slice information from a user equipment according to an embodiment of the present disclosure.

[0103] First, the base station 310 may receive slice information supportable by each frequency or cell from a core network (e.g., AMF) connected to the base station 310. At this time, when a specific user equipment switches to an idle mode or a connected mode, the slice information may be used to provide priority information of each frequency or cell to be applied on cell reselection.

[0104] UE 305 may send information about the slices on which UE 305 is registered or supported by UE 305 to base station 310. At this time, dedicated RRC signaling may be used to transmit information about the slices. For example, an RRC connection setup complete message may be used as dedicated RRC signaling in the RRC setup process. Base station 310 may implicitly obtain information about the slices on which UE 305 is registered or supported by UE 305 by considering a service. For example, if UE 305 requests a service with a URLLC attribute, base station 310 may consider that UE 305 is registered on a slice corresponding to URLLC, or that UE 305 supports a slice corresponding to URLLC. If base station 310 is not connected to an AMF that supports a slice corresponding to a service requested by user equipment 305, base station 310 may trigger redirection.

[0105] In operation 325, when converting UE 305 to idle mode or inactive mode, base station 310 may provide frequency priority information or cell priority information necessary for cell reselection of UE 305. At this time, the priority information may be included in the RRC connection release message. The priority information may be valid at a specific time, and a timer value indicating information about the time may be included in the RRC connection release message. If the timer expires, UE 305 may consider the priority information invalid.

[0106] In operation 325, a new IE IdleModeMobilityContolInfo (idle mode mobile control information) may be included in the RRC connection release message, and the IE may include freqPriorityListNR as priority information for each frequency for cell reselection. The information may include one or more entries. For each entry corresponding to a frequency, there may be carrier frequency information (carrierFreq), priority information (cellReselectionPriority) of the corresponding frequency, and slice information (supportedSliceList) supported in the corresponding frequency. A frequency may include one or more slices. The value of the cellReselectionPrioriry information is between 0 and 7, with 0 indicating the lowest priority. supportedSliceList is a list of slices supported by the indicated frequency, and a single network slice selection auxiliary information (S-NSSAI) value indicating the slice may be used. S-NSSAI may consist of SST and SD. SST is a slice type and SD is a slice distinguisher. S-NSSAI may have a conventional value or a network-specific value, and a conventional value may indicate eMBB, URLCC, and MIoT (mMTC). For example, the user equipment may send NSSAI information consisting of up to 8 S-NSSAIs to the network.

[0107]

Table 2

[0108]

[0109] Already in Figure 3 The embodiments of the present disclosure are described in detail by taking the information of each frequency as an example. However, it is not limited thereto. For example, it will be noted that the information of each cell can be provided in the same manner. Figure 44 is a diagram for describing a process of providing information related to a specific user equipment from a core network to a base station according to an embodiment of the present disclosure. In operation 413, supportable slice information for each frequency or each cell may be provided to the gNB 410 from the core network (e.g., AMF) connected to the gNB 410. At this time, when the specific UE is converted to an idle mode or a connected mode, the slice information may be used to provide priority information for each frequency or cell to be applied on cell selection.

[0110] In operation 415, the UE 405 in connected mode can be connected to the gNB 410.

[0111] In operation 430, information about the slices on which the UE 405 is registered or supported by the UE 405 may be provided to the gNB 410 from the core network (e.g., AMF).

[0112] In operation 435, UE 405 switches to connected mode to perform an authentication process through the AMF, and the AMF may automatically provide the gNB 410 with information about slices at the location where the UE 405 is registered or at a location supported by the UE 405.

[0113] In operation 440, when converting UE 405 to idle mode or inactive mode, gNB 410 may provide frequency priority information or cell priority information required for UE 405 to reselect a cell. At this time, the priority information may be included in the RRC connection release message. The priority information may be valid for a specific time, and a timer value indicating information about the time may be included in the RRC connection release message. If the timer expires, the user equipment 405 may consider the priority information invalid.

[0114] Figure 5 is a diagram for describing the operation of a base station according to an embodiment of the present disclosure.

[0115] In operation 505, supportable slice information for each frequency or each cell is provided from the core network to the base station.

[0116] In operation 510, information about registering a specific user equipment or slices supported by the specific user equipment is provided from the user equipment or the core network to the base station.

[0117] In operation 515, the base station identifies information about a slice in which a specific user equipment is registered or supported by a specific user equipment from the provided information about the slice. In operation 520, the base station maps the priority information to information about a frequency or a cell that supports the slice at which the user equipment is registered or supported by the user equipment. The base station includes information that the priority information is mapped to a specific RRC message.

[0118] In operation 525, the base station transmits a specific RRC message.

[0119] Figure 6 is a block diagram showing the structure of a user equipment according to an embodiment of the present disclosure. Figure 6 , the user equipment may include a radio frequency (RF) processor 610 , a baseband processor 620 , a memory 630 , and a controller 640 .

[0120] The RF processor 610 may perform functions such as frequency band conversion, amplification, etc. for transmitting and receiving signals through a wireless channel. That is, the RF processor 610 may up-convert a baseband signal provided from the baseband processor 620 into an RF band signal to transmit the RF band signal through an antenna, and may down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processor 610 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. Although in Figure 6 One antenna is shown in FIG. 1 , but the user equipment may include multiple antennas. In addition, the RF processor 610 may include multiple RF chains. The RF processor 610 may perform beamforming. For beamforming, the RF processor 610 may adjust the phase and amplitude of each signal sent and received through multiple antennas or antenna elements. The RF processor 610 may perform multiple-input multiple-output (MIMO) operations and receive multiple layers when performing MIMO operations.

[0121] The baseband processor 620 can perform a conversion function between a baseband signal and a bit stream according to the physical layer standard of the system. For example, the baseband processor 620 can encode and modulate the transmission bit stream to generate complex symbols when data is transmitted. The baseband processor 620 can recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 610 when data is received. For example, in the case of following the orthogonal frequency division multiplexing (OFDM) scheme, when data is transmitted, the baseband processor 620 can encode and modulate the transmission bit stream to generate complex symbols, map the complex symbols to subcarriers, and generate OFDM symbols by inverse fast Fourier operation (IFFT) and cyclic prefix (CP) insertion. When receiving data, the baseband processor 620 can divide the baseband signal provided from the RF processor 610 on the basis of OFDM symbols, recover the signal mapped to the subcarrier by fast Fourier transform (FFT) operation, and recover the received bit stream by demodulation and decoding.

[0122] As described above, the baseband processor 620 and the RF processor 610 can send and receive signals. Accordingly, the baseband processor 620 and the RF processor 610 can be referred to as or generally referred to as a transmitter, a receiver, a transceiver, or a communication unit. At least one of the baseband processor 620 and the RF processor 610 may include a plurality of communication modules for supporting different wireless access technologies. At least one of the baseband processor 620 and the RF processor 610 may include different communication modules for processing signals on different frequency bands. For example, different wireless access technologies may include wireless LANs (e.g., IEEE 802.11), cellular networks (e.g., LTE), and / or the like. Different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NRHz and NRhz) bands and millimeter wave (e.g., 60GHz) bands.

[0123] The memory 630 may store basic programs, applications, configuration information, etc. for the operation of the user equipment. In particular, the memory 630 may store information related to a second access node that performs wireless communication using a second radio access technology. The memory 630 provides stored data according to a request of the controller 640.

[0124] The controller 640 controls the overall operation of the user equipment. For example, the controller 640 may send and receive signals through the baseband processor 620 and the RF processor 610. The controller 640 may record data into the memory 630 and read data from the memory 630. To this end, the controller 640 may include: at least one processor. For example, the controller 640 may include a communication processor (CP) that performs control of communication and an application processor (AP) that controls an upper layer such as an application program.

[0125] Figure 7 is a diagram showing a structure of a master base station in a wireless communication system according to an embodiment of the present disclosure.

[0126] refer to Figure 7 , the base station may include an RF processor 710 , a baseband processor 720 , a backhaul communication unit 730 , a storage unit 740 , and a controller 750 .

[0127] The RF processor 710 may perform functions such as frequency band conversion, amplification, etc. for transmitting and receiving signals through a wireless channel. That is, the RF processor 710 may up-convert a baseband signal provided from the baseband processor 720 into an RF band signal to transmit the RF band signal through an antenna, and may down-convert an RF band signal received from an antenna into a baseband signal. For example, the RF processor 710 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although in Figure 7One antenna is shown in the figure, and the first access node may include multiple antennas. In addition, the RF processor 710 may include multiple RF chains. The RF processor 710 may perform beamforming. For beamforming, the RF processor 710 may adjust the phase and amplitude of each signal sent and received through multiple antennas or antenna elements. The RF processor 710 may perform downlink MIMO operations by sending one or more layers.

[0128] The baseband processor 720 may perform a conversion function between a baseband signal and a bit stream according to the physical layer standard of the first wireless access technology. For example, the baseband processor 720 may encode and modulate a transmission bit stream to generate complex symbols when data is transmitted. The baseband processor 720 may recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 710 when data is received. For example, in the case of following the OFDM scheme, when data is transmitted, the baseband processor 720 may encode and modulate the transmission bit stream to generate complex symbols, map the complex symbols to subcarriers, and generate OFDM symbols by IFFT operation and CP insertion. When data is received, the baseband processor 720 may divide the baseband signal provided from the RF processor 710 on the basis of OFDM symbols, recover the signal mapped to the subcarrier by FFT operation, and recover the received bit stream by demodulation and decoding. The baseband processor 720 may send and receive signals as described above. Accordingly, the baseband processor 720 and the RF processor 710 may be referred to or generally referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0129] The backhaul communication unit 730 may provide an interface for communicating with other nodes within the network. That is, the backhaul communication unit 730 may convert a bit stream sent from the master base station to other nodes (e.g., a secondary base station, a core network, etc.) into a physical signal, and convert a physical signal received from another node into a bit stream.

[0130] The storage unit 740 may store basic programs, application programs, configuration information, etc. for the operation of the master base station. In particular, the storage unit 740 may store information about the bearer allocated to the visited user equipment, the measurement results reported from the visited user equipment, etc. The storage unit 740 may store information that is a criterion for determining whether to provide dual connectivity to the user equipment or to stop dual connectivity. The storage unit 740 may provide the stored data according to the request of the controller 750.

[0131] The controller 750 controls the overall operation of the master base station. For example, the controller 750 may send and receive signals through the baseband processor 720, the RF processor 710, and the backhaul communication unit 730. The controller 750 may record data into the storage unit 740 and read data from the storage unit 740. To this end, the controller 750 may include at least one processor.

[0132] Figure 8 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure.

[0133] refer to Figure 8 , the wireless communication system 20 includes a new radio node B (NR NB) 810, a new radio core network (NR CN) 805, a new radio user equipment (NR UE, UE or user equipment) 815, an MME 825, and an evolved Node B (eNB) 830. The radio access network is composed of the NR NB 810 and the NR CN 805. The NR UE 815 accesses an external network through the NR NB 810 and the NR CN 805.

[0134] exist Figure 8 In the figure, NR NB 810 corresponds to the eNB of the existing LTE system. NR NB 810 is connected to NRUE 815 through a wireless channel and can provide services superior to those of the existing eNB. In the next generation mobile communication system, all user services are served by sharing channels, so a device for collecting buffer status, available transmission power status, channel status, etc. for scheduling is required, and NR NB 810 is responsible for this. Generally, NR NB 810 controls multiple cells. In order to achieve ultra-high-speed data transmission compared with the existing LTE, NR NB 810 may have a maximum bandwidth greater than or equal to the existing maximum bandwidth, and incorporate beamforming technology into the orthogonal frequency division multiplexing (OFDM) scheme as a wireless access technology. In addition, an adaptive modulation and coding (AMC) scheme that determines the modulation scheme and channel coding rate based on the channel state of the user equipment 815 is applied. NR CN805 can perform functions for supporting mobility, functions for establishing bearers, functions for configuring QoS, etc. NR CN805 is a device responsible for various control functions and functions for managing the mobility of the user equipment 815, and can be connected to multiple base stations. The fifth generation communication system can interact with the existing LTE system, and the NR CN 805 is connected to the MME 825 through a network interface. The MME 825 is connected to the eNB 830 which is an existing base station.

[0135] The present disclosure provides a method for alleviating overheating of a communication modem chipset of a user equipment in the event that the communication modem chipset overheats. Overheating problems may occur when a base station provides a configuration related to high-performance transmission to a user equipment. For example, high-level modulation or MIMO, configuration of multiple service cells, etc. may cause overheating problems.

[0136] Fig. 9 is a diagram illustrating a signal flow related to an operation for solving an overheating problem of a user equipment according to an embodiment of the present disclosure.

[0137] In operation 915, UE 905 may report capability information of UE 905 to gNB (E-UTRAN) 910 according to the request of gNB 910. At this time, the report may include information indicating that UE 905 has the capability to report an overheating problem when an overheating problem occurs. In the present disclosure, this will be referred to as a temporary UE capability indication.

[0138] In operation 920, if an overheating problem occurs and the overheating problem needs to be alleviated, the gNB 910 may command the UE 905 to report the occurrence of the overheating problem using an RRC connection reconfiguration message. In order to prevent frequent transmission of reports of the occurrence of the overheating problem, the gNB 910 may set a timer. After the report, the timer starts, and the UE 905 may not resend the report to the gNB 910 until the timer expires.

[0139] In operation 925, upon detecting an overheating problem, the UE 905 may derive a configuration for alleviating the overheating problem.

[0140] In operation 930, the UE 905 sends the configuration information derived by the UE 905 to the base station. At this time, UEAssistanceInformation (UE assistance information) may be used, and the configuration information may be:

[0141] 1) A one-bit indicator indicating an overheating problem has occurred,

[0142] 2) UE category that UE tends to be used for temporary applications,

[0143] 3) RF parameters related to carrier aggregation (CA) / MIMO that the UE prefers to apply temporarily, etc.

[0144] In operation 935, the gNB 910 receives the message and sends reconfiguration information to the UE 905 by considering the configuration information.

[0145] At operation 940, the UE 905 applies the reconfiguration information to improve or alleviate the overheating problem. If the overheating problem is improved or alleviated, the UE 905 sends a UEAssistanceInformation message to the E-UTRAN 910. The UEAssistanceInformation message may indicate that the temporarily applied reconfiguration information is no longer needed.

[0146] Meanwhile, the UE category in the configuration information may be related to the maximum TB size, soft channel bits, L2 buffer size, whether UL 64QAM is supported, etc. The parameters affecting the overheating problem in the configuration information are the maximum TB size, soft channel bits, and whether UL 64QAM is supported, and the L2 buffer size has no effect on solving the overheating problem. Otherwise, changing the L2 buffer size may be a heavy burden from a system perspective. Therefore, if the gNB 910 receives the UE category information that the UE prefers in order to solve the overheating problem, it is preferable to reconfigure information that can solve or alleviate the overheating in addition to the L2 buffer size.

[0147] Fig.10 is a diagram for describing an operation of a base station for processing UE category information transmitted from a user equipment according to an embodiment of the present disclosure.

[0148] In operation 1005, the base station receives temporary UE category information from the user equipment. At this time, the temporary UE category may correspond to ue-CategoryDL, ue-CategoryUL, or both.

[0149] In operation 1010, the base station determines whether UE category information is received from the user equipment through a UECapabilityInformation message or a UEAssistanceInformation message.

[0150] In operation 1015, if UE category information is received through the UECapabilityInformation message, the base station applies all information corresponding to the UE category.

[0151] In operation 1020, if UE category information is received through the UEAssistanceInformation message, the base station applies all information except the L2 buffer size.

[0152] Fig.11 is a diagram for describing a method for generating a UEAssistanceInformation message in an LTE-NR dual connectivity (DC) technology according to an embodiment of the present disclosure.

[0153] LTE-NR dual connectivity is a technology in which a user equipment is simultaneously connected to an LTE system and an NR system to send and receive data. At this time, the LTE system can perform the role of a host. All of LTE and NR can send and receive RRC control signaling, and RRC signaling sent and received with LTE can be sent through SRB1 or SRB2, and RRC signaling sent and received with NR can be sent through SRB3.

[0154] When an overheating problem occurs, the user equipment can send configuration information that can alleviate the overheating problem to the LTE system, the NR system, or both the LTE system and the NR system through UEAssistanceInformation. In the present disclosure, the configuration information can be changed according to the system that sends the UEAssistanceInformation message.

[0155] In operation 1105, the user equipment determines whether to send a UEAssistanceInformation message triggered by an overheating problem through SRB1 or SRB3. At this time, the case where the UEAssistanceInformation message is sent through SRB1 may mean that the message is sent through the LTE system.

[0156] Therefore, in operation 1110, UEAssistanceInformation transmitted through LTE may include at least one of the following configurations.

[0157] - Reduced UE categories.

[0158] -Maximum number of DL carriers

[0159] - Maximum number of UL carriers.

[0160] At operation 1115, a maximum UE data transmission rate corresponding to each DC band combination may be included by considering an LTE-NR DC case.

[0161] The case where a message is sent through SRB3 may mean that the message is sent through the NR system. Therefore, in operation 1120, UEAssistanceInformation sent through NR may include at least one of the following configuration information.

[0162] - Reduced UE maximum data rate (or reduced UE category).

[0163] -Maximum aggregate DL BW

[0164] -Maximum aggregate UL BW

[0165] In operation 1125, a maximum UE data transmission rate corresponding to each DC band combination may be included by considering an LTE-NR DC case.

[0166] Fig.12 is a block diagram showing the structure of a user equipment according to an embodiment of the present disclosure. Fig.12 , the user equipment may include a radio frequency (RF) processor 1210 , a baseband processor 1220 , a memory 1230 , and a controller 1240 .

[0167] The RF processor 1210 may perform functions such as frequency band conversion, amplification, etc. for transmitting and receiving signals through a wireless channel. That is, the RF processor 1210 may up-convert a baseband signal provided from the baseband processor 1220 into an RF band signal to transmit the RF band signal through an antenna, and may down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processor 1210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. Although in Fig.12 12 shows one antenna, but the user equipment may include multiple antennas. In addition, the RF processor 1210 may include multiple RF chains. The RF processor 1210 may perform beamforming. For beamforming, the RF processor 1210 may adjust the phase and amplitude of each signal sent and received through multiple antennas or antenna elements. The RF processor 1210 may perform MIMO operations and receive multiple layers when performing MIMO operations.

[0168] The baseband processor 1220 may perform a conversion function between a baseband signal and a bit stream according to the physical layer standard of the system. For example, the baseband processor 1220 may encode and modulate a transmission bit stream to generate complex symbols when data is transmitted. The baseband processor 1220 may recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1210 when data is received. For example, in the case of following an orthogonal frequency division multiplexing (OFDM) scheme, when data is transmitted, the baseband processor 1220 may encode and modulate the transmission bit stream to generate complex symbols, map the complex symbols to subcarriers, and generate OFDM symbols by inverse fast Fourier operation (IFFT) and cyclic prefix (CP) insertion. When data is received, the baseband processor 1220 may divide the baseband signal provided from the RF processor 1210 based on OFDM symbols, recover the signal mapped to the subcarrier by a fast Fourier transform (FFT) operation, and recover the received bit stream by demodulation and decoding. .

[0169] As described above, the baseband processor 1220 and the RF processor 1210 can send and receive signals. Accordingly, the baseband processor 1220 and the RF processor 1210 can be referred to as a transmitter, a receiver, a transceiver, or a communication unit. At least one of the baseband processor 1220 and the RF processor 1210 may include a plurality of communication modules for supporting different wireless access technologies. At least one of the baseband processor 1220 and the RF processor 1210 may include different communication modules for processing signals on different frequency bands. For example, different wireless access technologies may include wireless LANs (e.g., IEEE 802.11), cellular networks (e.g., LTE), and / or the like. Different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NRHz and NRhz) bands and millimeter wave (e.g., 60GHz) bands.

[0170] The memory 1230 may store basic programs, applications, configuration information, etc. for the operation of the user equipment. In particular, the memory 1230 may store information related to a second access node that performs wireless communication using a second radio access technology. The memory 1230 may provide stored data according to a request of the controller 1240.

[0171] The controller 1240 may control the overall operation of the user equipment. For example, the controller 1240 may send and receive signals through the baseband processor 1220 and the RF processor 1210. The controller 1240 may record data in the memory 1230 and read data from the memory 1230. To this end, the controller 1240 may include at least one processor. For example, the controller 1240 may include a communication processor (CP) that performs control of communication and an application processor (AP) that controls an upper layer such as an application program.

[0172] Fig.13 is a diagram showing a structure of a master base station in a wireless communication system according to an embodiment of the present disclosure.

[0173] refer to Fig.13 The base station may include an RF processor 1310 , a baseband processor 1320 , a backhaul communication unit 1330 , a storage unit 1340 , and a controller 1350 .

[0174] The RF processor 1310 may perform functions such as frequency band conversion, amplification, etc. for transmitting and receiving signals through a wireless channel. That is, the RF processor 1310 may up-convert a baseband signal provided from the baseband processor 1320 into an RF band signal to transmit the RF band signal through an antenna, and down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processor 1310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although in Fig.13 13. One antenna is shown in FIG. 13, but the first access node may include multiple antennas. In addition, the RF processor 1310 may include multiple RF chains. The RF processor 1310 may perform beamforming. For beamforming, the RF processor 1310 may adjust the phase and amplitude of each signal sent and received through multiple antennas or antenna elements. The RF processor 1310 may perform downlink MIMO operations by sending one or more layers.

[0175] The baseband processor 1320 may perform a conversion function between a baseband signal and a bit stream according to the physical layer standard of the first wireless access technology. For example, the baseband processor 1320 encodes and modulates the transmission bit stream to generate complex symbols when data is transmitted. The baseband processor 1320 may recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1310 when data is received. For example, in the case of following the OFDM scheme, when data is transmitted, the baseband processor 1320 may encode and modulate the transmission bit stream to generate complex symbols, map the complex symbols to subcarriers, and generate OFDM symbols by IFFT operation and CP insertion. When data is received, the baseband processor 1320 may divide the baseband signal provided from the RF processor 1310 on the basis of OFDM symbols, recover the signal mapped to the subcarrier by FFT operation, and recover the received bit stream by demodulation and decoding. The baseband processor 1320 may send and receive signals as described above. Accordingly, the baseband processor 1320 and the RF processor 1310 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0176] The backhaul communication unit 1330 may provide an interface for communicating with other nodes within the network. That is, the backhaul communication unit 1330 may convert a bit stream sent from the master base station to other nodes such as an auxiliary base station, a core network, etc. into a physical signal, and convert a physical signal received from another node into a bit stream.

[0177] The storage unit 1340 may store basic programs, application programs, configuration information, etc. for the operation of the master base station. In particular, the storage unit 1340 may store information about the bearer allocated to the visited user equipment, the measurement result reported from the visited user equipment, etc. The storage unit 1340 may store information that is a criterion for determining whether to provide dual connectivity to the user equipment or to stop dual connectivity. The storage unit 1340 may provide the stored data according to the request of the controller 1350.

[0178] The controller 1350 controls the overall operation of the master base station. For example, the controller 1350 may send and receive signals through the baseband processor 1320, the RF processor 1310, and the backhaul communication unit 1330. The controller 1350 may record data in the storage unit 1340 and read data from the storage unit 1340. To this end, the controller 1350 may include at least one processor.

[0179] Fig.14 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure.

[0180] refer to Fig.14 , the wireless communication system 30 includes a plurality of base stations 1405, 1410, 1415, and 1420, a mobility management entity (MME) 1425, and a serving gateway (S-GW) 1430. A user equipment (hereinafter, referred to as UE or terminal) 1435 accesses an external network through the base stations 1405, 1410, 1415, and 1420 and the S-GW 1430.

[0181] A plurality of base stations 1405, 1410, 1415 and 1420 are access nodes of a cellular network and provide wireless access to terminals accessing the network. That is, the base stations 1405, 1410, 1415 and 1420 collect state information such as a buffer state of a user equipment, an available transmission power state, a channel state, etc. to perform scheduling and support a connection between the user equipment and a core network (CN) to serve the user's business. The MME 1425 is a device responsible for various control functions and a mobility management function for the user equipment 1435 and is connected to a plurality of base stations, and the S-GW 1430 is a device that provides data bearers. In addition, the MME 1425 and the S-GW 1430 can perform authentication, bearer management, etc. on the user equipment 1435, and can process packets received from the plurality of base stations 1405, 1410, 1415 and 1420 and packets to be sent to the plurality of base stations 1405, 1410, 1415 and 1420.

[0182] Fig.15 is a diagram showing a structure of a wireless protocol in a wireless communication system according to an embodiment of the present disclosure.

[0183] Reference Fig.15, the wireless protocol of the wireless communication (e.g., LTE) system according to an embodiment of the present disclosure may include packet data convergence protocols (PDCP) 1505 and 1540, radio link control (RLC) 1510 and 1535, and medium access control (MAC) 1515 and 1530 in the user equipment 1501 and the ENB 1503. The packet data convergence protocols (PDCP) 1505 and 1540 are responsible for operations such as IP header compression / recovery, and the radio link control (RLC) 1510 and 1535 reconfigures the PDCP packet data unit (PDU) with an appropriate size. The MAC 1515 and 1530 are connected to a plurality of RLC layer devices configured in one user equipment, and perform operations for multiplexing the RLC PDU into the MAC PDU, and demultiplexing the MAC PDU into the RLC PDU. The physical layers 1520 and 1525 perform operations for channel coding and modulating upper layer data to generate OFDM symbols and transmit the OFDM symbols through a wireless channel, or for demodulating and channel decoding OFDM symbols received through a wireless channel to transmit the channel-decoded signal to the upper layer. The physical layers 1520 and 1525 use hybrid ARQ (HARQ) for additional error correction, and the receiving end sends 1 bit indicating whether the packet sent at the transmitting end is received. This will be referred to as HARQ ACK / NACK information. Downlink HARQ ACK / NACK information for uplink transmission can be sent through a physical hybrid ARQ indicator channel (PHICH) physical channel, and uplink HARQ ACK / NACK information for downlink transmission can be sent through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) physical channel.

[0184] Although not in Fig.15 As shown in FIG. 1 , a radio resource control (RRC) layer exists on an upper layer of the PDCP layer of each of the UE 1501 and the ENB 1503 , and the RRC layer may transmit and receive a configuration control message related to access and measurement for radio resource control.

[0185] At the same time, PHY layers 1520 and 1525 may be composed of one or more frequencies / carriers, and the technology for configuring multiple frequencies at the same time and using them will be referred to as carrier aggregation (CA) technology. At this time, CA technology can significantly increase the transmission volume by using a primary carrier and one or more secondary carriers to communicate between a terminal (or user equipment or UE) and a base station (E-UTRAN NodeB or eNB), rather than using one carrier for communication between a terminal and a base station. A cell within a base station using a primary carrier is referred to as a primary cell (PCell), and a secondary carrier is referred to as a secondary cell (SCell).

[0186] Fig.16 is a diagram for describing a carrier aggregation technology in a user equipment according to an embodiment of the present disclosure.

[0187] refer to Fig.16 , typically, multiple carriers are sent and received on multiple frequency bands in one base station. For example, when the base station 1605 sends a carrier 1615 with a center frequency f1 and a carrier 1610 with a center frequency f3, a user equipment that does not support carrier aggregation, that is, a user equipment that does not have carrier aggregation capability, uses one of the two carriers to receive data for transmission and transmission. However, a user equipment that supports carrier aggregation, that is, a user equipment with carrier aggregation capability, can use multiple carriers to send and receive data at the same time. The base station 1605 can increase the transmission speed of the user equipment 1630 by allocating more carriers to the user equipment 1630 with carrier aggregation capability according to the situation.

[0188] When one downlink carrier and one uplink carrier transmitted and received in one base station configure one cell, it will be understood that carrier aggregation means that a user equipment transmits and receives data through multiple cells at the same time. The maximum transmission speed increases in proportion to the number of carriers based on this aggregation.

[0189] Hereinafter, when explaining the present disclosure, the case where the user equipment receives data through any downlink carrier or sends data through any uplink carrier refers to the case where the user equipment sends and receives data using a control channel and a data channel provided by a cell corresponding to a center frequency and a frequency band of a designated carrier. Hereinafter, for convenience, the embodiments of the present disclosure will be assumed to be an LTE system, however, the present disclosure can be applied to various wireless communication systems supporting carrier aggregation.

[0190] Fig.17 is a diagram showing a frame structure of a wireless communication system according to an embodiment of the present disclosure. In particular, Fig.17 is a diagram showing a frame structure of a frame structure type 1 for a frequency division duplex (FDD) system and a frame structure of a frame structure type 2 for a time division duplex (TDD) system.

[0191] Reference Fig.17 In LTE, the length of one frame is 10ms for both frame structure type 1 and frame structure type 2, and the frame is divided into 10 subframes (#0, #1, #2, ..., #9) of length 1ms. The concept of subframe is the same in NR, and the absolute length of one subframe in NR is 1ms. In NR, one or more time slots can exist in a subframe depending on the spacing between secondary carriers.

[0192] Meanwhile, in the case of frame structure type 1 in LTE, downlink and uplink exist at different frequencies, so the entire subframe is used as downlink or uplink. In the case of frame structure type 2, refer to Fig.17 In the table, subframes #0, #2, #3, #4, #5, #7, #8, and #9 can be used as downlink subframes (marked as "D" in the table) or uplink subframes according to the TDD configuration (marked as "U" in the table). That is, in the case of TDD configuration 0, subframes #0 and #5 are used as downlink subframes, and subframes #2, #3, #4, #7, #8, and #9 are used as uplink subframes. In the case of TDD configuration 1, subframes #0, #4, #5, and #9 are used as downlink subframes, and subframes #2, #3, #7, and #8 are used as uplink subframes.

[0193] exist Fig.17 In the IEEE 802.11ac standard, subframes #1 and #6 are special subframes present in the switching interval from downlink to uplink. That is, this is divided into three durations, such as downlink pilot time slot (DwPTS), guard period (GP), and uplink pilot time slot (UpPTS). During the DwPTS duration, downlink data transmission can be performed. During the UpPTS duration, uplink data transmission is not possible, and sounding reference signals (e.g., sounding reference symbols (SRS)) and the like can be transmitted. GP is an idle duration between downlink and uplink.

[0194] Fig.18 is a diagram for describing transmission and reception of a message between a user equipment and a base station according to an embodiment of the present disclosure.

[0195] In operation 1811, the user equipment 1801 in the idle mode RRC_IDLE accesses the base station due to reasons such as the presence of data to be transmitted, the reception of a paging message indicating data to be received, etc. In the idle mode, since the user equipment 1801 is not connected to the network to save power, etc., the user equipment 1801 may not transmit data, so the user equipment 1801 needs to be transformed into the connected mode RRC_CONNECTED in order to transmit data. If the access process to the base station 1803 is successful, the state of the user equipment 1801 is changed to the connected mode RRC_CONNECTED.

[0196] In operation 1813, the base station 1803 may configure the SCell for a higher data transmission rate according to the capability of the corresponding user equipment. This may be sent via an RRCConnectionReconfiguration message of the RRC layer. The message of the RRC layer may include an identifier of the activated SCell, related channel information, etc.

[0197] In operation 1815, upon receiving the message, the user equipment 1801 sends a confirmation message indicating that the message is successfully received. The confirmation message may be sent via an RRCConnectionReconfigurationComplete message of the RRC layer.

[0198] In operation 1813, the base station 1803 may notify the user equipment 1801 which of the configured SCells is activated / deactivated. Notification may be performed by activating / deactivating a MAC control element (CE). The activation / deactivation MAC CE is a MAC CE consisting of 8 bits and having a fixed size, and may consist of 7 C fields and one R field or 31 C fields and one R field. The R field is a reserved field, and each of the 7 or 31 C fields may be represented using an identifier i of a serving cell (PCell or SCell) (i.e., Ci). For SCell i, each of the 7 or 31 C fields is marked as 1 to indicate activation, or marked as 0 to indicate deactivation, so each of the 7 or 31 C fields is used to indicate whether each auxiliary carrier is activated. The user equipment 1801 may receive the activation / deactivation MAC CE through the PCell or SCell that has been activated. As described above, the numbering (numerology) may be different between the PCell and the SCell or between the SCells, so the number of time slots may be different within 10ms. For example, if the interval between the secondary carriers is 15kHz, there are 10 time slots in 10ms, but if the interval is 60kHz, there may be 40 time slots in 10ms. Even if the user equipment receives the MAC CE, it takes time to receive and process the corresponding message and activate / deactivate a specific function accordingly, so when the corresponding message is received, all operations may not be activated or deactivated immediately, and time needs to be reserved by considering time.

[0199] In operation 1821, the user equipment 1801 determines when the user equipment 1801 activates an operation to be performed upon activation / deactivation. In this case, the following three methods may be used.

[0200] -Method 1: The user equipment starts and performs a first operation as a channel status report (e.g., CQI / PMI / RI / PTI / CRI) for the corresponding SCell based on the number / time slot length of the PCell (or base station), and starts a second operation based on the number / time slot length of the SCell to be activated (e.g., at a second time point), and the second operation is the following operation: sending a sounding reference signal (SRS) to the corresponding SCell, monitoring the PDCCH of the corresponding SCell, and starting sCellDeactivationTimer as a timer for deactivating the corresponding SCell when there is no operation on the corresponding SCell.

[0201] - Method 2: Each of the first operation and the second operation in Method 1 starts based on a predetermined number of PCell slots based on the PCell slot corresponding to a time point at which activation / deactivation MAC cell completion is received.

[0202] - Method 3: Each of the first operation and the second operation in Method 1 starts based on a predetermined number of subframes, the predetermined number being based on a subframe boundary corresponding to a time point at which activation / deactivation MAC cell completion is received.

[0203] In operations 1831 and 1833, the user device 1801 determines a first operation that the user device 1801 needs to perform at a first time point and a second operation that the user device 1801 needs to perform at a second time point according to each method, so as to start the corresponding operation at each time point of each method. Figure 19a-Figure 19c Describe each method.

[0204] Figure 19a-Figure 19c is a diagram showing time points at which SCells are activated / deactivated according to an embodiment of the present disclosure.

[0205] In particular, Fig.19a It is shown Fig.18 FIG. 1 is an example of method 1 in FIG. Fig.19b It is shown Fig.18 FIG. 1 is an example of method 2 in FIG. Fig.19c It is shown Fig.18 Figure 3 shows an example of method 3. Fig.19a , Fig.19b ,as well as Fig.19c In each of , the following scenario will be assumed: the base station configures SCell1 and SCell2 to the user equipment, SCell1 has been activated and SCell2 will be activated. For convenience, the following constants will be defined.

[0206] - C1: used to state the delay constant for operation 1 (i.e., CSI reporting (e.g., CQI / PMI / RI / PTI / CRI reporting)

[0207] - C2: Delay constant for stating operation 2 (ie, SRS transmission / PDCCH monitoring) on ​​criterion 1 (here, criterion 1 is the case where the SCell to be activated has been measured)

[0208] - C3: Delay constant for stating operation 2 (ie, SRS transmission / PDCCH monitoring) on ​​criterion 1 (here, criterion 1 is the case where the SCell to be activated is not measured)

[0209] At the same time, C1, C2 and C3 can be configured to the user equipment through a message of the RRC layer, or can have fixed values ​​according to each method (for example, C1 represents 8 time slots of the PCell, C2 represents 8 time slots of the SCell to be activated, C1 represents 8 subframes, C2 represents 8 subframes, and so on).

[0210] In 19a, the user equipment receives an activation / deactivation MAC CE on the 7th time slot 1907 of subframe n on SCell1 from the base station. The 7th time slot of subframe n on SCell1 corresponds to the 2nd time slot 1901 of subframe n on PCell. Fig.19a In the example, the 7th time slot 1907 of subframe n on SCell1 is called the reference 1 time slot.

[0211] For the activation / deactivation MAC CE received from the base station, if the reception is successful, the user equipment sends a HARQ ACK on the PCell. Fig.19a In this embodiment, this will be referred to as the reference 2 time slot. The reference 2 time slot corresponds to reference numeral 1903.

[0212] Accordingly, operation 1, namely, channel status reporting (1905), will start after the C1 slot time based on the PCell based on the reference 1 slot or the reference 2 slot. Fig.19a , a case where the reference 1 slot is used and C1=4 or a case where the reference 2 slot is used and C1=2 is shown.

[0213] Meanwhile, if there is no data to be sent for the activated SCell2 within a predetermined time, the user equipment may deactivate the SCell2, so the user equipment may drive the sCellDeactivationTimer. At this time, the sCellDeactivationTimer starts after the C2 slot time of the SCell2 to be activated based on the reference 1 slot or the reference 2 slot (1909). Fig.19a, a case where the reference 1 slot is used and C2=7 or a case where the reference 2 slot is used and C2=3 is shown.

[0214] In order to receive data on the activated SCell2, the user equipment needs to receive the PDCCH for the activated SCell2 or the PDCCH of the activated SCell2 to receive data. The user equipment needs to monitor the PDCCH for receiving data. At this time, the time point when monitoring starts is based on the reference 1 time slot or the reference 2 time slot, so the monitoring starts between the C2 time slot time 1909 based on the SCell to be activated and the C3 time slot time 1911 based on the SCell to be activated.

[0215] exist Fig.19b In the example, the user equipment receives an activation / deactivation MAC CE on the 7th time slot 1917 of the subframe n on the SCell1 from the base station. The 7th time slot of the subframe n on the SCell1 corresponds to the 2nd time slot 1911 of the subframe n on the PCell. Fig.19b This will be referred to as the Reference 1 time slot.

[0216] For the activation / deactivation MAC CE received from the base station, if the reception is successful, the user equipment sends a HARQ ACK on the PCell. Fig.19b This will be referred to as the reference 2 time slot. The reference 2 time slot corresponds to reference numeral 1913.

[0217] Accordingly, operation 1, namely, channel status reporting (1915), will start after the C1 slot time based on the PCell based on the reference 1 slot or the reference 2 slot. Fig.19b , a case where the reference 1 slot is used and C1=4 or a case where the reference 2 slot is used and C1=2 is shown.

[0218] Meanwhile, if there is no data to be sent for the activated SCell2 within a predetermined time, the user equipment may deactivate the SCell2, so the user equipment may drive the sCellDeactivationTimer. At this time, the sCellDeactivationTimer starts after the C2 slot time of the PCell based on the reference 1 slot or the reference 2 slot (1919). Fig.19b , a case where the reference 1 slot is used and C2=4 or a case where the reference 2 slot is used and C2=2 is shown.

[0219] In order to receive data on the activated SCell2, the user equipment needs to receive the PDCCH for the activated SCell2 or the PDCCH of the activated SCell2 to receive data. The user equipment needs to monitor the PDCCH for receiving data. At this time, the time point for starting monitoring is based on the reference 1 time slot or the reference 2 time slot, so the monitoring starts between the C2 time slot time 1919 based on the PCell and the C3 time slot time 1921 based on the PCell.

[0220] exist Fig.19c In , the user equipment receives an activation / deactivation MAC CE on the 7th time slot 1927 of the subframe n on SCell1 from the base station. The 7th time slot of the subframe n on SCell1 corresponds to the subframe n 1921. Fig.19c In the example, the 7th time slot of subframe n on SCell1 is called the reference subframe.

[0221] Accordingly, operation 1, ie, channel status reporting (1923), will start after the C1 subframe time of the subframe based on the reference subframe. Accordingly, operation 1 of the corresponding SCell starts at time slot 1925 of the PCell corresponding to subframe n+2.

[0222] At the same time, if there is no data of the activated SCell2 to be sent within a predetermined time, the user equipment may deactivate the SCell2, so the user equipment may drive the sCellDeactivationTimer. At this time, the sCellDeactivationTimer may start at the time slot 1929 of the corresponding SCell, which corresponds to the time after the C2 subframe based on the subframe.

[0223] In order to receive data on the activated SCell2, the user equipment needs to receive the PDCCH for the activated SCell2 or the PDCCH of the activated SCell2 to receive data. The user equipment needs to monitor the PDCCH for receiving data. At this time, the time point for starting monitoring is based on the reference subframe, so the monitoring starts between the first time slot 1929 of the activated SCell2 corresponding to the C2 subframe time 1923 and the first time slot 1931 of the activated SCell2 corresponding to the C2 subframe time 1933.

[0224] Fig. 20 is a diagram for describing a method for a user equipment to perform activation and deactivation according to an embodiment of the present disclosure.

[0225] It will be assumed that the user equipment can be connected to the base station to send and receive data. In addition, it will be assumed that carrier aggregation is performed between cells operating at a frequency where the subframe length of the PCell is different from the subframe length of the SCell. Accordingly, the base station can configure an additional SCell for the user equipment to achieve higher data transmission speed.

[0226] In operation 2003, the user equipment receives a message from the base station indicating that an SCell will be additionally configured. The message may be sent via an RRCConnectionReconfiguration message of the RRC layer. The message of the RRC layer may include an identifier of the SCell to be activated, related channel information, etc. After receiving the message, the user equipment sends a confirmation message indicating that the message is successfully received, and the confirmation message may be sent using an RRCConnectionReconfigurationComplete message of the RRC layer.

[0227] In operation 2005, the user equipment may receive a message from the base station for activating (or deactivating) an additionally configured SCell. The message may be sent via an activation / deactivation MAC control element (CE). The activation / deactivation MAC CE may be received on a PCell or SCell that has been activated. As described above, the numbering may be different between the PCell and the SCell or between the SCells, so the number of time slots may be different within 10ms. For example, if the interval between the secondary carriers is 15kHz, there are 10 time slots within 10ms, but if the interval is 60kHz, there may be 40 time slots within 10ms. Even if the user equipment receives the MAC CE, it takes time to receive and process the corresponding message and activate / deactivate specific functions accordingly, so when the corresponding message is received, all operations may not be activated or deactivated immediately, and a predetermined time is required.

[0228] -Method 1: The user equipment starts and performs a first operation as a channel status report (e.g., CQI / PMI / RI / PTI / CRI) for the corresponding SCell based on the number / time slot length of the PCell (or subframe); and starts a second operation based on the number / time slot length of the SCell to be activated (e.g., at a second time point), the second operation being the following operation: sending a sounding reference signal (SRS) to the corresponding SCell, monitoring the PDCCH in the corresponding SCell, and starting sCellDeactivationTimer as a timer for deactivating the corresponding SCell without performing any operation on the corresponding SCell.

[0229] - Method 2: Each of the first operation and the second operation in Method 1 starts based on a predetermined number of PCell slots based on the PCell slot corresponding to a time point at which activation / deactivation MAC cell completion is received.

[0230] - Method 3: Each of the first operation and the second operation in Method 1 starts based on a predetermined number of subframes, the predetermined number being based on a subframe boundary corresponding to a time point at which activation / deactivation MAC cell completion is received.

[0231] In operation 2007, the user equipment determines a first operation that the user equipment needs to perform at a first time point and a second operation that the user equipment needs to perform at a second time point according to each of the three methods. The user equipment starts the corresponding operation.

[0232] Fig.21 is a diagram showing a structure of a user equipment in a wireless communication system according to an embodiment of the present disclosure.

[0233] refer to Fig.21 , the user equipment may include a radio frequency (RF) processor 2110 , a baseband processor 2120 , a storage unit 2130 , and a controller 2140 .

[0234] The RF processor 2110 may perform functions such as frequency band conversion, amplification, etc. for transmitting and receiving signals through a wireless channel. That is, the RF processor 2110 may up-convert the baseband signal provided from the baseband processor 2120 into an RF band signal to transmit the RF band signal through an antenna, and down-convert the RF band signal received through the antenna into a baseband signal. For example, the RF processor 2110 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. Although in Fig.21 1 , one antenna is shown, but the user equipment may include multiple antennas. In addition, the RF processor 2110 may include multiple RF chains. The RF processor 2110 may perform beamforming. For beamforming, the RF processor 2110 may adjust the phase and amplitude of each signal sent and received through multiple antennas or antenna elements.

[0235] The baseband processor 2120 can perform conversion functions between baseband signals and bit streams according to the physical layer standard of the system. For example, the baseband processor 2120 can encode and modulate the transmission bit stream to generate complex symbols when data is transmitted. The baseband processor 2120 can recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 2110 when data is received. For example, in the case of following the orthogonal frequency division multiplexing (OFDM) scheme, when data is transmitted, the baseband processor 2120 can encode and modulate the transmission bit stream to generate complex symbols, map the complex symbols to subcarriers, and generate OFDM symbols through inverse fast Fourier operation (IFFT) and cyclic prefix (CP) insertion. When receiving data, the baseband processor 2120 can divide the baseband signal provided from the RF processor 2110 on the basis of OFDM symbols, recover the signal mapped to the subcarrier through a fast Fourier transform (FFT) operation, and recover the received bit stream through demodulation and decoding.

[0236] As described above, the baseband processor 2120 and the RF processor 2110 send and receive signals. Accordingly, the baseband processor 2120 and the RF processor 2110 may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. At least one of the baseband processor 2120 and the RF processor 2110 may include a plurality of communication modules for supporting different wireless access technologies. At least one of the baseband processor 2120 and the RF processor 2110 may include different communication modules for processing signals on different frequency bands. For example, different wireless access technologies may include wireless LANs (e.g., IEEE 802.11), cellular networks (e.g., LTE), and / or the like. Different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz and 5 GHz) bands and millimeter wave (e.g., 60 GHz) bands.

[0237] The memory 2130 may store basic programs, application programs, configuration information, etc. for the operation of the user equipment. In particular, the memory 2130 may store information related to wireless LAN nodes that perform wireless communication using wireless LAN access technology. The memory 2130 may provide stored data according to a request of the controller 2140.

[0238] The controller 2140 may control the overall operation of the user equipment. For example, the controller 2140 may send and receive signals through the baseband processor 2120 and the RF processor 2110. The controller 2140 may record data into the memory 2130 and read data from the memory 2130. To this end, the controller 2140 may include at least one processor. For example, the controller 2140 may include a communication processor (CP) that performs control over communication and an application processor (AP) that controls upper layers such as application programs. According to an embodiment of the present disclosure, the controller 2140 may include a dual connection processor 2142 to perform processing for operations in the dual connection mode. For example, the controller 2140 may control the user equipment to perform Fig.21 process.

[0239] After receiving an activation / deactivation command for the corresponding cell from the base station, and after receiving a command to add the corresponding cell whose subframe length is different, the controller 2140 can determine the time point to activate / deactivate the given operation based on the difference between the subframe length of the current PCell and the subframe length of the activated SCell to perform the given operation. Fig. 22 is a diagram showing a structure of a wireless communication system according to an embodiment of the present disclosure.

[0240] refer to Fig. 22 , the wireless communication system includes a plurality of base stations 2205, 2210, 2215 and 2220, a mobility management entity (MME) 2225 and a serving gateway (S-GW) 2230. A user equipment (hereinafter referred to as UE or terminal) 2235 accesses an external network through the base stations 2205, 2210, 2215 and 2220 and the S-GW 2230.

[0241] Base stations 2205, 2210, 2215, and 2220 are access nodes of a cellular network and provide wireless access to user equipment accessing the network. That is, base stations 2205, 2210, 2215, and 2220 collect status information such as buffer status, available transmission power status, channel status, etc. of user equipment to perform scheduling and support the connection between the user equipment and the core network (CN) to serve the user's business. MME 2225 is a device responsible for various control functions of user equipment 2235 and mobility management functions, and is connected to multiple base stations, and S-GW 2230 is a device that provides data bearer. In addition, MME 2225 and S-GW 2230 can perform authentication, bearer management, etc. on user equipment 2235, and process packets received from base stations 2205, 2210, 2215, and 2220 and packets sent to base stations 2205, 2210, 2215, and 2220.

[0242] Fig.23is a diagram showing a frame structure of a wireless communication system according to an embodiment of the present disclosure.

[0243] refer to Fig.23 , the wireless protocol of the wireless communication (e.g., LTE) system may include a packet data convergence protocol (PDCP) 2305 and 2340, a radio link control (RLC) 2310 and 2335, and a medium access control (MAC) 2315 and 2330 in the user equipment 2301 and the ENB 2303. The packet data convergence protocol (PDCP) 2305 and 2340 is responsible for operations such as IP header compression / restoration, and the radio link control (RLC) 2310 and 2335 reconfigures a PDCP packet data unit (PDU) with an appropriate size. The MAC 2315 and 2330 are connected to a plurality of RLC layer devices configured in one user equipment, and perform operations for multiplexing RLC PDUs into MAC PDUs and demultiplexing MAC PDUs into RLC PDUs. The physical layers 2320 and 2325 perform operations for channel coding and modulating upper layer data to generate OFDM symbols and transmit the OFDM symbols through a wireless channel, or for demodulating and channel decoding OFDM symbols received through a wireless channel to transmit the channel-decoded signal to the upper layer. The physical layers 2320 and 2325 use hybrid ARQ (HARQ) for additional error correction, and the receiving end sends 1 bit indicating whether the packet sent at the transmitting end is received. This will be referred to as HARQ ACK / NACK information. Downlink HARQ ACK / NACK information for uplink transmission can be sent through a physical hybrid ARQ indicator channel (PHICH) physical channel, and uplink HARQ ACK / NACK information for downlink transmission can be sent through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) physical channel. The PUCCH is generally transmitted on the uplink of the PCell to be described below, but if the user equipment supports additional transmission of the PUCCH, there is a case where the user equipment additionally transmits the PUCCH, which will be referred to as a PUCCH SCell.

[0244] Although not in Fig.23 As shown in , a radio resource control (RRC) layer exists on an upper layer of the PDCP layer of each of the user equipment and the base station, and the RRC layer can transmit and receive a configuration control message related to access and measurement of radio resource control.

[0245] At the same time, the PHY layers 420 and 425 may be composed of one or more frequencies / carriers, and the technology for configuring multiple frequencies at the same time and using them will be referred to as carrier aggregation (CA) technology. At this time, the CA technology can significantly increase the transmission volume by using a primary carrier and one or more secondary carriers to communicate between the terminal (or user equipment or UE) and the base station (E-UTRAN NodeB or eNB), rather than using one carrier for communication between the terminal and the base station. In LTE, the cell within the base station using the primary carrier is called the primary cell (PCell), and the secondary carrier is called the secondary cell (SCell).

[0246] Meanwhile, in the LTE system, the user equipment reports power headroom information (e.g., PHR power headroom report (PHR)) to the base station according to a predetermined standard. The power headroom information indicates the difference between the maximum transmit power configured for the user equipment and the transmit power estimated by the user equipment. The transmit power estimated by the user equipment is calculated based on the value used when transmitting when the user equipment actually transmits an uplink (the calculated value at this time is called an actual value), but when the user equipment does not actually transmit an uplink, the transmit power estimated by the user equipment is calculated based on a predetermined formula defined in the standard specification (the calculated value at this time is called a virtual value). The base station can identify the maximum transmittable power value of the user equipment based on the report of the power headroom information. Meanwhile, in the case of CA, each secondary carrier transmits power headroom information.

[0247] Fig.24 is a diagram for describing a carrier aggregation technology in a user equipment according to an embodiment of the present disclosure.

[0248] Reference Fig.24 , typically, multiple carriers are transmitted and received across multiple frequency bands in one base station 2405. For example, when the base station 2405 transmits a carrier 2415 with a center frequency of f1 and a carrier 2410 with a center frequency of f3, a user equipment without carrier aggregation capability uses one of the two carriers to transmit and receive data. However, a user equipment with carrier aggregation capability can use multiple carriers to transmit and receive data at the same time. The base station 2405 can increase the transmission speed of the user equipment 2430 by allocating more carriers to the user equipment 2430 with carrier aggregation capability according to the situation.

[0249] When one downlink carrier and one uplink carrier for transmission and reception in a base station configure one cell, it will be understood that carrier aggregation means that a user equipment simultaneously transmits and receives data through multiple cells. The maximum transmission speed increases in proportion to the number of carriers based on this aggregation.

[0250] Hereinafter, when explaining the present disclosure, the case where the user equipment receives data through any downlink carrier or sends data through any uplink carrier refers to the case where the user equipment sends and receives data using a control channel and a data channel provided by a cell corresponding to a center frequency and a frequency band of a designated carrier. Hereinafter, for convenience, the embodiments of the present disclosure will be assumed to be an LTE system, however, the present disclosure can be applied to various wireless communication systems supporting carrier aggregation.

[0251] In the case of performing carrier aggregation or not performing carrier aggregation, uplink transmission (i.e., transmission from user equipment to base station) causes interference in the uplink of another cell, so the uplink transmission output needs to be maintained at an appropriate level. To this end, in order to perform uplink transmission, the user equipment uses a predetermined function to calculate the uplink transmission output, and performs uplink transmission based on the calculated uplink transmission output. For example, the user equipment inputs an input value that can estimate the channel condition into a predetermined function, and the channel condition is, for example, scheduling information such as the amount of allocated transmission resources, modulation and coding scheme (MCS) level to be applied, path loss value, etc. to calculate the required uplink transmission output value, and performs uplink transmission by applying the required uplink transmission output value. The uplink transmission output value that the user equipment can apply is limited according to the maximum transmission value of the user equipment. If the required uplink transmission output value is greater than the maximum transmission value of the user equipment, the user equipment performs uplink transmission by applying the maximum transmission value. In this case, it is impossible to apply enough uplink transmission output, so a decline in uplink transmission quality may occur. Preferably, the base station performs scheduling so that the required transmission output is not greater than the maximum transmission output. However, the base station may not be able to identify some parameters such as path loss, so if necessary, the user equipment reports the available transmission power (e.g., power headroom (PH)) status of the user equipment to the base station by sending a power headroom report (PHR) message.

[0252] Parameters that affect the available transmission power include: 1) the amount of allocated transmission resources; 2) the MCS to be applied to uplink transmission; 3) the path loss of the relevant downlink carrier; 4) the accumulated value of the command for adjusting the output; etc. For each uplink carrier, the path loss (PL) or the accumulated output adjustment command value may be different, so if multiple uplink carriers are aggregated for one user equipment, it is correct to configure whether to send PHR for each uplink carrier. However, for effective PHR transmission, all PHs of multiple uplink carriers can be reported on one uplink carrier. Depending on the operating strategy, the PH for the carrier on which no actual PUSCH transmission occurs may be required. In this case, it is more efficient to report all PHs of multiple uplink carriers on one uplink carrier. To this end, it is necessary to extend the existing PHR. Multiple PHs to be included in one PHR can be configured according to a predetermined order.

[0253] Typically, a PHR is triggered if the path loss of the connected uplink carrier is changed by a value greater than or equal to a predetermined reference value, if the PHR prohibition timer expires, or if a predetermined duration has passed after the PHR. Even if the PHR is triggered, the user equipment does not send the PHR immediately, but waits until a point in time when uplink transmission is possible, such as a point in time when uplink transmission resources are allocated. This is why the PHR is not information that needs to be processed very quickly.

[0254] Fig.25 2 is a diagram illustrating dual connectivity (DC) in LTE and NR according to an embodiment of the present disclosure.

[0255] When using the dual connectivity (DC) technology, the user equipment can be connected to two base stations at the same time and use the two base stations at the same time. Fig.2525 illustrates a case where a user equipment 2505 is simultaneously connected to a macro base station 2500 using LTE technology and a small cell base station 2510 using NR technology to send and receive data with the macro base station 2500 and the small cell base station 2510. This will be referred to as E-UTRAN-NR dual connection (EN-DC). The macro base station will be referred to as the main E-UTRAN NodeB (MeNB), and the small cell base station will be referred to as the secondary 5G NodeB (SgNB). There may be multiple small cells in the service area of ​​the MeNB 2500, and the MeNB 2500 is connected to the SgNB 2510 through a wired backhaul network 2515. A group of service cells provided from the MeNB 2500 will be referred to as a master cell group (MCG) 2520, and one of the service cells in the MCG 2520 must be a primary cell (PCell) 2525 having all functions (e.g., connection establishment, connection reestablishment, handover, etc.) that the existing cell has performed. In the PCell, the uplink control channel includes the PUCCH. The serving cells other than the PCell will be referred to as secondary cells (SCells) 2530. Fig.25 A scenario is shown in which MeNB 2500 provides one SCell and SgNB 2510 provides three SCells. A group of service cells provided from SgNB 2510 will be referred to as a secondary cell group (SCG) 2540. When a user equipment sends and receives data with two base stations, MeNB2500 commands SgNB 2510 to add, change and delete the service cells provided from SgNB 2510. For this command, MeNB2500 can configure the user equipment to measure the service cell and the neighbor cell. The user equipment needs to report the measurement results to MeNB2500 according to the configuration information. In order for the SgNB to effectively send and receive data with the user equipment, a service cell is required that performs a role similar to the PCell of MCG 2520, which will be referred to as the primary SCell (PSCell) in this disclosure. One of the service cells of SCG2540 is determined to be a PSCell, and the PSCell has a PUCCH as an uplink control channel. The PUCCH is used by the user equipment to send HARQ ACK / NACK information, channel state information (CSI) information, scheduling request (SR), etc. to the base station.

[0256] Fig.26 is a diagram for describing an uplink transmission method and an uplink type according to a configuration according to an embodiment of the present disclosure. Fig.26Example 1 in is a diagram showing a scenario in which two serving cells, namely PCell 2601 and SCell 2603, are configured for a user equipment and the user equipment performs uplink transmission according to the scheduling of the base station. In this scenario, due to the limitation of the transmission method and the limitation of the RF structure, the user equipment may not be able to simultaneously send the PUCCH and PUSCH as described above in one serving cell. Therefore, the user equipment embeds the PUCCH information into the PUSCH to send the PUSCH (2605). At this time, if the PUSCH is not sent in the PCell, the PUCCH information is sent in the PCell, or the PUCCH information is sent in the SCell with a smaller index in the SCell. The PHR message as described above is sent as part of the PUSCH, so in this case, the user equipment is required to report a power headroom value, which is obtained by dividing the power headroom value by the maximum transmission power P of each serving cell. CMAX，c The power headroom is generated by subtracting the transmission power consumed by PUSCH transmissions 2605 and 2607 from the power headroom. This will be referred to as the Type 1 power headroom.

[0257] Fig.26 Example 2 in is a diagram showing a scenario in which two serving cells, namely PCell 2611 and SCell 2613, are configured for a user equipment and the user equipment performs uplink transmission according to scheduling of a base station. In this scenario, the user equipment has the ability to simultaneously transmit PUCCH and PUSCH in one serving cell, or the ability to separately transmit PUCCH and PUSCH using an uplink transmission technique that can be transmitted simultaneously as described above. At this time, in the case of the PCell (or the SCell in the case where PUCCH can be transmitted in the SCell), considering the transmission power consumed by PUSCH transmission 2617 and the transmission power consumed by PUCCH transmission 2615, the user equipment needs to report the maximum transmission power P transmitted by transmitting from the PCell to the PUCCH 2617. CMAX，c The power headroom value is generated by subtracting the transmission power consumed by the PUCCH transmission 2615 and the transmission power consumed by the PUSCH transmission 2617. This will be referred to as a type 2 power headroom.

[0258] Fig. 27 is a diagram for describing transmission and reception of a message between a user equipment and a base station according to an embodiment of the present disclosure.

[0259] In operation 2711, the user equipment 2701 in the idle mode RRC_IDLE accesses the base station due to reasons such as the presence of data to be transmitted, the reception of a paging message indicating the presence of data to be received, etc. In the idle mode, since the user equipment 2701 is not connected to the network for energy saving, etc., the user equipment 2701 may not transmit data, so the user equipment 2701 needs to be transformed into the connected mode RRC_CONNECTED in order to transmit data. If the access process to the base station 2703 is successful, the state of the user equipment 2701 is changed to the connected mode RRC_CONNECTED.

[0260] In operation 2713, the base station 2703 may configure an additional SCell for a higher data transmission rate according to the capability of the corresponding user equipment. If the user equipment 2701 supports the transmission of PUCCH in the additional SCell, the base station 2703 may configure the user equipment 2701 to send PUCCH in the additional SCell. The base station 2703 may configure parameters for reporting PHR. Parameters related to PHR include periodic PHR-Timer, prohibited PHR-Timer, dl-PathlossChange, etc. The periodic PHR-Timer is a timer configured to periodically report the PHR value to the base station 2703, the prohibited PHR-Timer is a timer configured to prevent frequent PHR reports, and if the instantaneous change of the downlink channel is greater than or equal to the dl-PathlossChange value, the value of dl-PathlossChange is the threshold for causing the user equipment 2701 to report PHR. The base station 2703 may further include indicator 1, indicator 2, and indicator 3 in the parameters related to PHR, where indicator 1 indicates a type 2PH report of the PCell, indicator 2 indicates a type 2PH report of the PUCCH SCell when the PUCCH SCell is additionally configured, and indicator 3 indicates a type 2PH report of the PSCell of the DC when the DC is used. The user equipment 2701 may determine whether to report the type 2PH of the corresponding cell (e.g., PCell, PUCCH SCell, PSCell) based on whether the indicator is included.

[0261] For example, if the base station 2703 configures normal CA, the base station 2703 may include indicator 1 in the parameters related to the PHR to configure the user equipment 2701 to report the type 2 PH for the PCell. For another example, if the base station 2703 configures CA and configures the user equipment 2701 to send PUCCH on a specific SCell, the base station 2703 may include indicator 1 and indicator 2 in the parameters related to the PHR to configure the user equipment 2701 to report the type 2 PH of the corresponding PUCCH SCell. In the case where DC is configured between NR and NR, the base station 2703 may configure indicator 1 and indicator 3 for the user equipment 2701 when configuring PH reporting for the MCG so that the user equipment 2701 reports the type 2 PH for the PCell and PSCell. When the PH reporting is configured for the SCG, the base station 2703 may configure indicator 1 and indicator 3 to the user equipment 2701 so that the user equipment 2701 reports the type 2 PH for the PCell and PSCell. In the case where DC is configured between LTE and NR (i.e., in the case of EN-DC), the base station 2703 may not be required to indicate PH reporting for LTE MCG. However, when PH reporting is configured for NR SCG, the base station 2703 may configure indicator 1 and indicator 3 to the user equipment 2701 so that the user equipment 2701 reports type 2 PH for PCell and PSCell. The configuration information may be sent using the RRCConnectionReconfiguration message of the RRC layer.

[0262] In operation 2715, upon receiving the message, the user equipment 2701 sends a confirmation message indicating that the message is successfully received, and the confirmation message may be sent using an RRCConnectionReconfigurationComplete message of the RRC layer.

[0263] Meanwhile, the criteria for when to send the PHR to the base station (ie, when to trigger a report) include the following criteria.

[0264] - When the PHR-Prohibit Timer expires, the change in downlink reception strength is greater than or equal to dl-PathlossChange dB

[0265] - When the periodic PHR timer expires

[0266] - Initial configuration of PHR reports

[0267] - Add the case where the SCell including uplink

[0268] -When using dual connectivity technology, adding a primary cell (such as PSCell) of an auxiliary base station

[0269] If the PHR triggering criteria occurs, in operation 2721, the user equipment 2701 generates a PHR to report the PHR to the base station 2703. At this time, the user equipment 2701 determines whether to report the type 2PH of the corresponding cell according to whether indicator 1, indicator 2, and indicator 3 are included, and sends a message including type 2PH or a message not including type 2PH. Even if the indicator is not included, for example, when EN-DC is configured to the user equipment 2701 and configured to enable the user equipment 2701 to perform uplink transmission through all two CGs, the user equipment 2701 can also send all type 1PH of the two CGs to the base station (or, the base station can send an indicator indicating whether type 1PH is included, so the user equipment can determine whether to send type 1PH accordingly). Even if the indicator is not included, for example, in the case where EN-DC is configured for the user equipment 2701 and it is configured so that the user equipment 2701 performs uplink transmission through a CG (e.g., MCG), the user equipment 2701 can send type 1PH to the base station 2703 only through the CG on which the transmission is configured (alternatively, the base station can send an indicator indicating whether type 1PH is included, so that the user equipment can determine whether to send type 1PH accordingly).

[0270] The PHR is reported to the base station 2703 so that the base station 2703 can determine the current available power of the user equipment 2701 to schedule the user equipment 2701 accordingly.

[0271] Fig.28 1 is a flowchart for describing a method for sending a PHR in a user equipment according to an embodiment of the present disclosure. It will be assumed that the user equipment is already connected to the base station, so the user equipment can perform data transmission / reception. Thereafter, the base station may additionally configure an SCell to the user equipment, and if the user equipment supports it, the user equipment may be configured to send a PUCCH to the added SCell.

[0272] In operation 2803, the base station may configure parameters for reporting PHR to the user equipment. The parameters related to PHR include periodic PHR-Timer, prohibited PHR-Timer, dl-PathlossChange, etc. The periodic PHR-Timer is a timer configured to periodically report the PHR value to the base station, the prohibited PHR-Timer is a timer configured to prevent frequent PHR reporting, and the dl-PathlossChange value is a threshold that causes the user equipment to report PHR if the instantaneous change of the downlink channel is greater than or equal to the value. The base station may additionally include indicator 1, indicator 2, and indicator 3 in the parameters related to PHR reporting, indicator 1 indicating a type 2PH report of the PCell, indicator 2 indicating a type 2PH report of the PUCCH SCell in the case of additional configuration of the PUCCH SCell, and indicator 3 indicating a type 2PH report of the PSCell of the DC in the case of using DC. The user equipment may determine whether to report the type 2PH of the corresponding cell (e.g., PCell, PUCCH SCell, PSCell) based on whether the indicator is included.

[0273] For example, if the base station is configured with normal CA, the base station may include indicator 1 in the parameters related to PHR to configure the user equipment to report type 2PH for PCell. For another example, if the base station is configured with CA and the user equipment is configured to send PUCCH on a specific SCell, the base station may include indicator 1 and indicator 2 in the parameters related to PHR to configure the user equipment to report type 2PH for the corresponding PUCCH SCell. In the case where DC is configured between NR and NR, the base station may configure indicator 1 and indicator 3 for the user equipment when configuring PH reporting for MCG so that the user equipment reports type 2PH for PCell and PSCell. When PH reporting is configured for SCG, the base station may configure indicator 1 and indicator 3 to the user equipment so that the user equipment reports type 2PH for PCell and PSCell. In the case where DC is configured between LTE and NR (i.e., in the case of EN-DC), the base station does not need to indicate PH reporting for LTE MCG. However, when PH reporting is configured for NR SCG, the base station can configure indicator 1 and indicator 3 to the user equipment so that the user equipment reports type 2 PH of PCell and PSCell. The configuration information can be sent using the RRCConnectionReconfiguration message of the RRC layer.

[0274] In operation 2803, upon receiving the message, the user equipment sends a confirmation message indicating that the message is successfully received. The confirmation message may be sent using an RRCConnectionReconfigurationComplete message of the RRC layer.

[0275] Meanwhile, the criteria for when to send the PHR to the base station (ie, when to trigger a report) include the following criteria.

[0276] - When the PHR-Prohibit Timer expires, the change in downlink reception strength is greater than or equal to dl-PathlossChange dB

[0277] - When the periodic PHR timer expires

[0278] - Initial configuration of PHR reports

[0279] - Add the case where the SCell including uplink

[0280] -When using dual connectivity technology, adding a primary cell (such as PSCell) of an auxiliary base station

[0281] If the PHR trigger criterion occurs in operation 2805, the user equipment generates a PHR in operation 2807. In operation 2809, the user equipment reports the generated PHR to the base station. At this time, the user equipment determines whether to report the type 2PH of the corresponding cell according to whether indicator 1, indicator 2 and indicator 3 are included, and sends a message including type 2PH or a message not including type 2PH. Even if the indicator is not included, for example, in the case where EN-DC is configured to the user equipment and configured so that the user equipment performs uplink transmission through all two CGs, the user equipment can also send type 1PH for all two CGs to the base station (or, the base station can send an indicator indicating whether type 1PH is included, so the user equipment can determine whether to send type 1PH based on this). Even if this indicator is not included, for example, in a case where EN-DC is configured for the user equipment and configured for the user equipment to perform uplink transmission through a CG (e.g., MCG), the user equipment may send type 1PH to the base station only through the CG in which the transmission is configured (alternatively, the base station may send an indicator indicating whether type 1PH is included, so that the user equipment may determine whether to send type 1PH accordingly).

[0282] The user equipment may provide information by reporting the PHR to the base station so that the base station may determine the current available power of the user equipment and schedule the user equipment accordingly.

[0283] Fig.29is a diagram illustrating a structure of a user equipment in a wireless communication system according to an embodiment of the present disclosure.

[0284] refer to Fig.29 , the user equipment may include a radio frequency (RF) processor 2910 , a baseband processor 2920 , a memory 2930 , and a controller 2940 .

[0285] The RF processor 2910 may perform functions such as frequency band conversion, amplification, etc. for transmitting and receiving signals through a wireless channel. That is, the RF processor 2910 may up-convert a baseband signal provided from the baseband processor 2920 into an RF band signal to transmit the RF band signal through an antenna, and may down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processor 2910 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. Although in Fig.29 One antenna is shown in FIG. 1 , and the user equipment may include multiple antennas. In addition, the RF processor 2910 may include multiple RF chains. The RF processor 2910 may perform beamforming. For beamforming, the RF processor 2910 may adjust the phase and amplitude of each signal sent and received through multiple antennas or antenna elements.

[0286] The baseband processor 2920 can perform conversion functions between baseband signals and bit streams according to the physical layer standard of the system. For example, the baseband processor 2920 can encode and modulate the transmission bit stream to generate complex symbols when data is transmitted. The baseband processor 2920 can recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 2910 when data is received. For example, in the case of following the orthogonal frequency division multiplexing (OFDM) scheme, when data is transmitted, the baseband processor 2920 can encode and modulate the transmission bit stream to generate complex symbols, map the complex symbols to subcarriers, and generate OFDM symbols by inverse fast Fourier operation (IFFT) and cyclic prefix (CP) insertion. When receiving data, the baseband processor 2920 can divide the baseband signal provided from the RF processor 2910 based on the OFDM symbol, recover the signal mapped to the subcarrier by the fast Fourier transform (FFT) operation, and recover the received bit stream by demodulation and decoding.

[0287] As described above, the baseband processor 2920 and the RF processor 2910 can send and receive signals. Accordingly, the baseband processor 2920 and the RF processor 2910 can be referred to as a transmitter, a receiver, a transceiver, or a communication unit. At least one of the baseband processor 2920 and the RF processor 2910 may include a plurality of communication modules for supporting different wireless access technologies. At least one of the baseband processor 2920 and the RF processor 2910 may include different communication modules for processing signals on different frequency bands. For example, different wireless access technologies may include wireless LANs (e.g., IEEE 802.11), cellular networks (e.g., LTE), and / or the like. Different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz and 5 GHz) bands and millimeter wave (e.g., 60 GHz) bands.

[0288] The memory 2930 may store basic programs, application programs, configuration information, etc. for the operation of the user equipment. In particular, the memory 2930 may store information related to wireless LAN nodes that perform wireless communication using wireless LAN access technology. The memory 2930 may provide stored data according to a request of the controller 2940.

[0289] The controller 2940 may control the overall operation of the user equipment. For example, the controller 2940 may send and receive signals through the baseband processor 2920 and the RF processor 2910. The controller 2940 may record data into the memory 2930 and read data from the memory 2930. To this end, the controller 2940 may include at least one processor. For example, the controller 2940 may include a communication processor (CP) that performs control over communication and an application processor (AP) that controls upper layers such as application programs. According to an embodiment of the present disclosure, the controller 2940 may include a dual connection processor 2942 to perform processing for operations in the dual connection mode. For example, the controller 2940 may control the user equipment to perform Fig.29 process.

[0290] According to an embodiment of the present disclosure, the controller 2940 can identify the power headroom type to be reported by each serving cell based on the configuration information received from the base station, obtain the power headroom type from the physical layer, and send a message for sending corresponding information to the base station.

[0291] The methods according to the embodiments described in the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0292] If the method is implemented in the form of software, a computer-readable storage medium storing one or more programs (or software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured so that one or more processors in an electronic device can execute the one or more programs. The one or more programs include instructions that cause the electronic device to perform the method according to the embodiments described in the claims and / or the specification of the present disclosure.

[0293] These programs (software modules and software) may be stored in non-volatile memory including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, compact disks (CD-ROM), digital versatile disks (DVD) or other forms of optical storage devices, and magnetic tape cassettes. Alternatively, these programs may be stored in a memory consisting of a combination of some or all of these. In addition, multiple component memories may be included.

[0294] The program can be stored on an attachable storage device, which can be accessed through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (Wide LAN) or a storage area network (SAN) or a communication network composed of these functions. The storage device can access the device that performs the embodiments of the present disclosure through an external port. In addition, the attached device on the communication network can access the device that performs the embodiments of the present disclosure.

[0295] In a specific embodiment of the present disclosure, the components included in the present disclosure are expressed in a singular form or a plural form according to the specific embodiment proposed. However, the singular form or the plural form is appropriate because the form is selected according to the situation proposed for convenience, so the present disclosure is not limited to a single component or multiple components, and the components that have been expressed in a plural form expression can be expressed in a singular form, or the components that have been expressed in a singular form can be expressed in a plural form.

[0296] While the present disclosure has been shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving, from the base station, a radio resource control (RRC) release message including first information about a cell reselection priority associated with slice-based cell reselection; and performing the slice-based cell reselection based on the first information, wherein the first information includes second information about a frequency priority list for the slice-based cell reselection and a timer value, wherein the second information comprises a list of at least one slice corresponding to each frequency, wherein a cell reselection priority associated with the list of at least one slice has an integer value from 0 to 7, wherein when the timer set according to the timer value expires, the frequency priority list for the slice-based cell reselection provided by the second information is discarded, and The first information is derived based on the slice information supported by the cell for the terminal, and the slice information is provided to the base station by the access and mobility management function AMF.

2. The method according to claim 1 also includes sending slice-related information to the base station for supporting slice-based cell reselection.

3. A method performed by a base station in a wireless communication system, the method comprising: Receiving slice information supported by the cell for the terminal from the access and mobility management function AMF; generating first information about a cell reselection priority associated with slice-based cell reselection, the first information being derived based on the slice information for the terminal provided by the AMF; and sending a radio resource control (RRC) release message including the first information to the terminal, The first information is associated with slice-based cell reselection of the terminal and includes second information about a frequency priority list for the slice-based cell reselection and a timer value, wherein the second information comprises a list of at least one slice corresponding to each frequency, wherein the cell reselection priority associated with the list of at least one slice has an integer value from 0 to 7, and Wherein, when the timer set according to the timer value expires, the frequency priority list for the slice-based cell reselection provided by the second information is discarded.

4. The method according to claim 3 also includes receiving slice-related information from the terminal for supporting slice-based cell reselection.

5. A terminal in a wireless communication system, the terminal comprising: transceiver; and The controller is configured as: receiving, via the transceiver, a radio resource control (RRC) release message including first information about a cell reselection priority associated with slice-based cell reselection from a base station, and performing the slice-based cell reselection based on the first information, wherein the first information includes second information about a frequency priority list for the slice-based cell reselection and a timer value, wherein the second information comprises a list of at least one slice corresponding to each frequency, wherein a cell reselection priority associated with the list of at least one slice has an integer value from 0 to 7, wherein when the timer set according to the timer value expires, the frequency priority list for the slice-based cell reselection provided by the second information is discarded, and The first information is derived based on the slice information supported by the cell for the terminal, and the slice information is provided to the base station by the access and mobility management function AMF. The terminal according to claim 5, wherein: The controller is further configured to send slice-related information for supporting slice-based cell reselection to the base station via the transceiver.

7. A base station in a wireless communication system, the base station comprising: transceiver; and The controller is configured as: Receiving, via the transceiver, slice information supported by the cell for the terminal from an access and mobility management function AMF; generating first information about a cell reselection priority associated with slice-based cell reselection, the first information being derived based on the slice information for the terminal provided by the AMF, and sending a radio resource control (RRC) release message including the first information to the terminal via the transceiver, The first information is associated with slice-based cell reselection of the terminal and includes second information about a frequency priority list for the slice-based cell reselection and a timer value, wherein the second information comprises a list of at least one slice corresponding to each frequency, wherein the cell reselection priority associated with the list of at least one slice has an integer value from 0 to 7, and Wherein, when the timer set according to the timer value expires, the frequency priority list for the slice-based cell reselection provided by the second information is discarded.

8. The base station according to claim 7, wherein: The controller is further configured to receive slice-related information for supporting slice-based cell reselection from the terminal via the transceiver.

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