Method and apparatus for providing terminal heat generation related information in a multi-connection supported mobile communication system

Abstract

The present disclosure relates to a communication technology and a system for combining IoT technology with a 5G communication system that supports a higher data transmission rate than 4G systems. The present disclosure can be applied to intelligent services based on 5G communication technology and IoT-related technologies, such as smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, and services related to safety and security. The present disclosure discloses a method and apparatus for reporting heat-related information of a terminal.

Description

Technical Field

[0001] The present disclosure relates to a mobile communication system supporting dual connectivity (DC), and more particularly, to a method and apparatus for providing thermal-related information of a terminal in a communication system supporting dual connectivity. Background Art

[0002] In order to meet the increasing demand for wireless data services commercially available in the current 4G communication system, efforts are being made to develop an enhanced 5G communication system or a pre-5G communication system. Therefore, the 5G communication system or the pre-5G communication system is referred to as a super 4G network communication system or a post-LTE system. The 5G communication system defined by 3GPP is referred to as a New Radio (NR) system.

[0003] In order to achieve a high data transmission rate, it is being considered to implement the 5G communication system in the millimeter wave band (e.g., 60 GHz band). To mitigate the routing loss of any radio wave in the millimeter wave band and increase the transmission distance of the radio wave, for the 5G communication system, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are being discussed.

[0004] In addition, in order to enhance the network in the 5G communication system, innovative small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device-to-device communication (D2D), wireless backhaul, mobile network, cooperative communication, coordinated multi-point (CoMP), and interference cancellation technologies are being developed.

[0005] In addition, hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and sliding window superimposed coding (SWSC) as advanced coding modulation (ACM) methods; filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies are being developed for the 5G system.

[0006] Compared with the existing 4G system, in the 5G system, support for various services is being considered. For example, the most representative services may include enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), massive machine type communication (mMTC), evolved multimedia broadcast / multicast service (eMBMS), etc. A system providing URLLC service may be referred to as a URLLC system, and a system providing eMBB service may be referred to as an eMBB system. In addition, the terms "service" and "system" may be used interchangeably.

[0007] Different from the existing 4G system, the URLLC service is a newly considered service in the 5G system and requires to meet ultra-high reliability compared with other services (e.g., the packet error rate is about 10-5 ) and low latency (e.g., about 0.5 milliseconds) conditions. To meet such strict requirements, URLLC services may need to apply a transmission time interval shorter than that of eMBB services, and various operation methods using such a transmission time interval are being considered.

[0008] The Internet has evolved from a human - centric connected network where people generate and consume information to the Internet of Things (IoT), which provides / receives, and processes information to / from distributed components such as things. Big data processing technologies have emerged through the Internet of Everything (IoE) technology that combines with IoT technology by connecting to cloud servers. To implement IoT, technical elements such as sensing technology, wired and wireless communication, network infrastructure, service interface technology, security technology, etc. are required; thus, research is currently being conducted on technologies for sensor networks, machine - to - machine (M2M), and machine - type communication (MTC) for connections between things.

[0009] In the IoT environment, intelligent Internet technology (IT) services can be provided, which collect and analyze data generated in connected things to provide new value to human life. Through the integration and complex connection between existing information technology (IT) and various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and high - tech medical services.

[0010] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, 5G communication technologies such as sensor networks, machine - to - machine (M2M), and machine - type communication (MTC) have been implemented through technologies such as beamforming, MIMO, and array antennas. The application of cloud RAN as the above - mentioned big data processing technology can be an example of the integration of 5G technology and IoT technology.

[0011] With the development of communication systems, various operations for dual connectivity are being specified. SUMMARY OF THE INVENTION

[0012] [Technical Problem]

[0013] The present disclosure provides a process for transmitting heat - related information to each base station in the case of dual connectivity of a terminal. In addition, the present disclosure provides a process in which each base station supporting dual connectivity shares and negotiates heat - related information reported from the terminal.

[0014] The present disclosure provides a method and apparatus in which multiple DRXs can be configured, and one or more serving cells apply one of the multiple configured DRXs.

[0015] The present disclosure also provides a method and apparatus for configuring and applying (long) DRX command MAC CE for multiple DRXs.

[0016] The present disclosure also provides a method and apparatus, in which multiple DRXs can be configured, and one or more serving cells apply one of the multiple configured DRXs.

[0017] The present disclosure also provides a method and apparatus, in which multiple DRXs can be configured, and one or more serving cells apply one of the multiple configured DRXs.

[0018] The present disclosure also provides a method and apparatus for applying DRX for radio link monitoring (RLM), link recovery, and measurement determination.

[0019] The present disclosure also provides a method for a terminal to send control information to a base station in a mobile communication system.

[0020] The technical problems to be solved by the present disclosure are not limited to the above technical problems, and those of ordinary skill in the art to which the present disclosure pertains will clearly understand other technical problems not mentioned from the following description.

[0021] [Solution to the Problem]

[0022] According to an embodiment of the present disclosure, a method performed by a terminal of a wireless communication system includes: the terminal receiving a first message, the first message including information indicating that the terminal is capable of sending first auxiliary information about a second base station to the first base station based on the detection of internal overheating of the terminal from the first base station; detecting internal overheating of the terminal; and based on the internal overheating of the terminal, sending a second message including the first auxiliary information about the second base station to the first base station.

[0023] In addition, the first message may further include configuration information, the configuration information configuring the terminal to report second auxiliary information about the first base station based on the detection of internal overheating of the terminal, the second message may further include the second auxiliary information about the first base station, the configuration information may include a timer configured to limit the second auxiliary information about the first base station, and the second message including the first auxiliary information about the second base station may not be sent to the first base station while the timer is running.

[0024] In addition, the auxiliary information about the second base station may include at least one of information on the maximum frequency bandwidth preferred by the terminal within frequency range 1 (FR1), information on the maximum frequency bandwidth preferred by the terminal within frequency range 2 (FR2), information on the number of maximum multiple-input multiple-output (MIMO) layers preferred by the terminal within FR1, information on the number of maximum MIMO layers preferred by the terminal within FR2, or the number of maximum secondary cells (SCells) preferred by the terminal.

[0025] In addition, the first base station may be a Long Term Evolution (LTE) base station, and the second base station may be a New Radio (NR) base station, and evolved Universal Terrestrial Radio Access (E-UTRA)-NR Dual Connectivity (EN-DC) performed by the first base station and the second base station may be configured for a terminal.

[0026] According to another embodiment of the present disclosure, a method performed by a first base station of a wireless communication system includes: sending, by the first base station, a first message, the first message including information indicating that a terminal is capable of sending first assistance information about a second base station to the first base station according to detection of internal overheating of the terminal; receiving, according to the internal overheating of the terminal, a second message from the terminal, the second message including the first assistance information about the second base station; and sending the first assistance information about the second base station to the second base station.

[0027] According to another embodiment of the present disclosure, a terminal of a wireless communication system includes a transceiver; and a controller configured to receive, via the transceiver, a first message from a first base station, the first message including information indicating that the terminal may send first assistance information about a second base station to the first base station according to detected internal overheating of the terminal, detect the internal overheating of the terminal, and send, according to the internal overheating of the terminal, a second message including the first assistance information about the second base station to the first base station via the transceiver.

[0028] According to another embodiment of the present disclosure, a first base station of a wireless communication system includes a transceiver; and a controller configured to: send, via the transceiver, a first message to a terminal, the first message including information indicating that the terminal is capable of sending first assistance information about a second base station to the first base station according to detection of internal overheating of the terminal; receive, via the transceiver, a second message from the terminal, the second message including the first assistance information about the second base station according to the internal overheating of the terminal; and send, via the transceiver, the first assistance information about the second base station to the second base station.

[0029] [Advantages of the Invention]

[0030] According to various embodiments of the present disclosure, the process of a dual-connectivity terminal sending heat-related information to each base station can be effectively performed, and the process of each base station supporting the dual connectivity of the terminal giving and receiving heat-related information reported from the terminal can also be effectively performed.

[0031] In addition, according to an embodiment of the present disclosure, a method and an apparatus may be provided in which multiple DRXs may be configured, and one or more serving cells apply one of the multiple configured DRXs.

[0032] In addition, according to an embodiment of the present disclosure, a method and an apparatus for configuring and applying (long) DRX command MAC CE for multiple DRXs may be provided.

[0033] In addition, according to an embodiment of the present disclosure, a method and an apparatus may be provided, in which multiple DRXs may be configured, and one or more serving cells apply one of the multiple configured DRXs.

[0034] In addition, according to an embodiment of the present disclosure, a method and an apparatus may be provided, in which multiple DRXs may be configured, and one or more serving cells apply one of the multiple configured DRXs.

[0035] In addition, according to an embodiment of the present disclosure, a method and an apparatus for DRX applied to radio link monitoring (RLM), link recovery, and measurement determination may be provided.

[0036] In addition, according to an embodiment of the present disclosure, control information may be effectively transmitted to a base station in a mobile communication system.

[0037] The effects obtainable in the present disclosure are not limited to the above effects, and other effects not mentioned can be clearly understood by those of ordinary skill in the art to which the present disclosure pertains from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1a is a diagram showing the structure of a mobile communication system according to an embodiment of the present disclosure.

[0039] Figure 1b is a message flow diagram showing a process of reporting predetermined information of a reporting terminal's preference to a base station in a mobile communication system according to an embodiment of the present disclosure.

[0040] Figure 1c is a message flow diagram showing a process of a terminal reporting predetermined information to a base station to mitigate terminal overheating in a mobile communication system according to an embodiment of the present disclosure.

[0041] Figure 1d is a message flow diagram showing a process of reporting predetermined information of a reporting UE's preference to a base station to prevent overheating in an EN-DC (EUTRA-NR DC) scenario according to an embodiment of the present disclosure.

[0042] Figure 1e is a flowchart showing the operation of a terminal in Option 1 process according to an embodiment of the present disclosure.

[0043] Figure 1f is a flowchart showing the operation of a terminal in Option 2 process according to an embodiment of the present disclosure.

[0044] Figure 1g is a flowchart illustrating the operation of a base station according to an embodiment of the present invention.

[0045] Figure 2a FIG. is a diagram showing DRX operations in the existing LTE technology.

[0046] Figure 2b FIG. is a message flow diagram showing a method for providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0047] Figure 2c FIG. is a diagram showing the operation of a terminal when a (long) DRX command MAC CE is received according to an embodiment of the present disclosure.

[0048] Figure 2d FIG. is a flowchart showing the operation of a terminal in a method of applying a new DRX command MAC CE in a first scenario according to an embodiment of the present disclosure.

[0049] Figure 2e FIG. is a flowchart showing the operation of a terminal in a method of reusing a conventional DRX command MAC CE in a first scenario according to an embodiment of the present disclosure.

[0050] Figure 2f FIG. is a flowchart showing the operation of a terminal for activating or deactivating second DRX configuration information in a second scenario according to an embodiment of the present disclosure.

[0051] Figure 3a FIG. is a message flow diagram showing a method for providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0052] Figure 3b FIG. is a flowchart showing the operation of a terminal according to an embodiment of the present disclosure.

[0053] Figure 3c FIG. is a flowchart showing the operation of a base station according to an embodiment of the present disclosure.

[0054] Figure 3d FIG. is a diagram showing a method for supporting wake-up signaling when providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0055] Figure 3e FIG. is a flowchart showing the operation of a terminal for supporting wake-up signaling when providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0056] Figure 4a FIG. is a message flow diagram showing a method for providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0057] Figure 4b FIG. is a diagram illustrating radio link monitoring (RLM) operations according to an embodiment of the present invention.

[0058] Figure 4cIt is a flowchart showing the operations of a terminal for applying multiple DRX configuration information to RLM, link recovery, and measurement operations according to an embodiment of the present disclosure.

[0059] Figure 5a It is a message flowchart showing the process in which a terminal reports predetermined information to a base station in a mobile communication system to reduce overheating of the terminal according to an embodiment of the present disclosure.

[0060] Figure 5b It is a message flowchart showing the process in which a terminal reports predetermined information to a base station in a mobile communication system to reduce a delay phenomenon of the terminal according to an embodiment of the present disclosure.

[0061] Figure 5c It is a message flowchart showing the process of reporting predetermined information indicating a first terminal preference to a base station in a DC scenario according to an embodiment of the present disclosure.

[0062] Figure 5d It is a message flowchart showing the process of reporting predetermined information indicating a second terminal preference to a base station in a DC scenario according to an embodiment of the present disclosure.

[0063] Figure 5e It is a flowchart showing the operations of a terminal according to an embodiment of the present disclosure.

[0064] Figure 5f It is a flowchart showing the operations of a base station according to an embodiment of the present disclosure.

[0065] Figure 6 It is a block diagram showing the internal structure of a terminal according to an embodiment of the present invention.

[0066] Figure 7 It is a block diagram showing the configuration of a base station according to an embodiment of the present invention. Detailed Description of the Invention

[0067] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the following description, when determining that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, its detailed description will be omitted.

[0068] For the same reason, some components are enlarged, omitted, or schematically shown in the drawings. In addition, the dimensions of each component do not fully reflect the actual dimensions. In each drawing, the same reference numerals denote the same or corresponding components.

[0069] In the following, for ease of description, terms for identifying access nodes used in the specification, terms for indicating network entities, terms for indicating messages, terms for indicating interfaces between network objects, terms for indicating various types of identification information, etc. are enumerated. Therefore, the present disclosure is not limited to the terms described below, and other terms indicating objects having equivalent technical meanings may be used.

[0070] In the following, for ease of description, the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to the above terms and names, and can be equivalently applied to systems compliant with other standards. In the present disclosure, for convenience of description, evolved Node B (eNB) may be used in combination with gNB. That is, a base station described as an eNB may represent a gNB. In addition, the term "terminal" may refer to a mobile phone, an NB-IoT device, a sensor, and other wireless communication devices.

[0071] Referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for realizing them will become apparent. However, the present disclosure is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only these embodiments are required to make the present disclosure complete, and are provided to fully inform those of ordinary skill in the art to which the present disclosure pertains of the scope of the present disclosure, and the present disclosure is only defined by the scope of the claims. Throughout the specification, the same reference numerals denote the same components.

[0072] In this case, it will be understood that each block of the flowchart and combinations of the flowchart can be executed by computer program instructions. Since these computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, the instructions executed by the processor of the computer or other programmable data processing device generate a means for performing the functions described in the flowchart blocks. Since these computer program instructions can be stored in a computer-usable or computer-readable memory, the computer-usable or computer-readable memory can direct the computer or other programmable data processing device to implement the functions in a specific manner, so the instructions stored in the computer-usable or computer-readable memory can produce a product containing an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions can be installed on a computer or other programmable data processing device, a series of operation steps are performed on the computer or other programmable data processing device to generate a process executed by the computer; therefore, the instructions for executing the computer or other programmable data processing device can provide steps for performing the functions described in the flowchart blocks.

[0073] In addition, each block can represent a module, a segment, or a portion of code that includes one or more executable instructions for performing a specified logical function. It should also be noted that in some alternative implementations, the functions stated in the boxes may occur out of order. For example, two blocks shown one after another may actually be executed substantially simultaneously, or these blocks may sometimes be executed in the reverse order according to the corresponding functions.

[0074] In this case, the term "unit" used in this embodiment means a hardware component such as an FPGA or an ASIC, or software, and the "unit" performs certain roles. However, the "unit" is not limited to software or hardware. The "unit" can be configured to reside in an addressable storage medium, or can be configured to reproduce one or more processors. Thus, by way of example, the "unit" includes components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and the "unit" can be combined into a smaller number of components and "unit", or can be further separated into additional components and "unit". In addition, the components and the "unit" can be implemented to reproduce one or more CPUs in a device or a secure multimedia card.

[0075] Figure 1a is a diagram showing the structure of a mobile communication system according to an embodiment of the present disclosure.

[0076] Reference Figure 1a , as shown in the figure, the radio access network of the next-generation mobile communication system (New Radio (NR)) can be configured with next-generation base stations (New Radio Node B, hereinafter referred to as gNB) 1a-10 and an access management function (AMF, 1a-05, that is, an entity of the New Radio core network). The New Radio user equipment (hereinafter referred to as NR UE or UE) 1a-15 accesses the external network through the gNB 1a-10 and the AMF 1a-05.

[0077] In Figure 1aIn it, gNB 1a-10 corresponds to the evolved Node B (eNB) of the existing LTE system. gNB 1a-10 is connected to NR UE 1a-15 via a radio channel and can provide services superior to those of the existing Node B (1a-20). In NR, since all user services are served through a shared channel, a device for collecting and scheduling state information such as buffer status, available transmission power status, and channel status of the UE is required, and gNB 1a-10 is responsible for this. One gNB 1a-10 usually controls multiple cells. Compared with the existing LTE, in order to achieve ultra-high-speed data transmission, gNB 1a-10 can have a bandwidth larger than the existing maximum bandwidth, and can use orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as the radio access technology and additional beamforming technology. In addition, an adaptive modulation and coding (AMC) scheme that determines the modulation scheme and channel coding rate according to the channel state of the UE is applied. AMF 1a-05 performs functions such as mobility support, bearer configuration, and quality of service (QoS) configuration. AMF 1a-05 is a device responsible for various control functions of the UE and the mobility management function, and is connected to multiple base stations. In addition, NR can be linked to the existing LTE system, and AMF 1a-05 is connected to the Mobility Management Entity (MME) 1a-25 via a network interface. MME 1a-25 is connected to eNB 1a-30 which is an existing base station. A UE supporting LTE-NR dual connectivity (EN-DC) can send and receive data while maintaining connections not only to gNB 1a-10 but also to eNB 1a-30 (1a-35).

[0078] Figure 1b is a message flow diagram showing the process of reporting predetermined information to a base station in a mobile communication system according to an embodiment of the present disclosure, where the predetermined information reports UE preferences.

[0079] In LTE and NR mobile communication systems, a UE can report preferences relative to the current configuration to the base station. For example, in LTE, a UE can report the following preferences.

[0080] - Power consumption reduction preference (UE power preference)

[0081] - Preferred uplink / downlink bandwidth (BW preference)

[0082] - Preferred delay budget

[0083] - Preferred semi-persistent scheduling (SPS) configuration

[0084] - Cooling preference (overheat assistance)

[0085] A base station for which a preference has been reported may trigger a corresponding reconfiguration. For example, a base station for which a preference for power consumption reduction, latency reduction, and temperature reduction has been reported may be reconfigured by reducing or increasing the discontinuous reception (DRX) cycle.

[0086] In NR, a UE may report a preferred latency budget and a temperature reduction preference to a base station.

[0087] In particular, in NR, compared with LTE, a UE may report preferred reconfiguration items in more detail for temperature reduction. That is, in LTE, for temperature reduction, a UE may indicate a preferred UE category and the number of UE-preferred secondary cells (SCells), while in NR, a UE may indicate the number of preferred maximum SCells, the aggregated BW (frequency bandwidth), and the number of maximum multiple-input multiple-output (MIMO) layers.

[0088] In the process of reporting preferences, first, UE 1b-05 reports to base station 1b-10 that it has the ability to report each of the above items (1b-15). Based on the capability information, the base station configures the UE to be able to report each preference to the base station at the time points necessary for each preference (1b-20). The UE reports its preferences to the base station at the necessary time points (1b-25).

[0089] Figure 1c It is a message flow diagram showing a process in which a UE reports predetermined information to a base station in a mobile communication system to relieve overheating of the UE according to an embodiment of the present disclosure.

[0090] In both mobile communication systems LTE and NR, there are many similarities in the process of a UE reporting information for overheating mitigation. Since a UE may overheat during data transmission and reception, reconfiguration from the base station may be required to relieve UE heating. To this end, a mobile communication system has introduced a process in which a UE reports predetermined information to a base station to relieve UE heating. The predetermined information is reconfiguration information preferred by the UE to suppress overheating.

[0091] UE 1c-05 reports to base station 1c-10 that it has the ability to report predetermined information (1c-15). The base station configures the UE via a predetermined information element (IE) (e.g., overheatingAssistanceConfig IE) to be able to report predetermined information to the base station. This IE may include a value of a prohibit timer (overheatingIndicationPrehibitTimer). When the UE detects overheating (1c-25) and reports the predetermined information (1c-30), timer 1c-35 is driven, and while the timer is running, the predetermined information cannot be reported again. This is to prevent excessive signaling overhead caused by frequent triggering of reports. The predetermined information is stored in the overheatingAssistance IE and is sent to the base station via a UEAssistanceInformation message, which is a radio resource control (RRC) message. In the two mobile communication systems LTE and NR, the information stored in the overheatingAssistance IE is different.

[0092] Table 1 shows the overheatingAssistance IE in TS36.331, which is an LTE standard document.

[0093] [Table 1]

[0094]

[0095] In [Table 1], reduced UE-Category indicates the UE-preferred UE category. The UE category is an indicator used to classify the overall capabilities of the UE. For example, the higher the UE category, the better the data transfer rate.

[0096] reducedMaxCC indicates the maximum number of SCell preferred by the UE. This information is indicated for each of the uplink and downlink.

[0097] However, Table 2 shows the overheatingAssistance IE in the NR standard document TS38.331.

[0098] [Table 2]

[0099]

[0100] In [Table 2], reducedMaxCC indicates the maximum number of SCell preferred by the UE. This information is indicated for each of the uplink and downlink.

[0101] reducedMaxBW-FR1 and reducedMaxBW-FR2 indicate the maximum frequency bandwidths preferred by the UE within frequency range 1 (FR1) and frequency range 2 (FR2), respectively. This information is indicated for each of the uplink and downlink. FR is the frequency range defined by the NR standard. FR1 represents the lower frequency range based on a specific frequency, and FR2 represents the higher frequency range. reducedMaxBW-FR2 may indicate 0 MHz, which means a request to release FR2. In reducedMaxBW-FR1, 0 MHz cannot be indicated.

[0102] reducedMaxMIMO-LayersFR1 and reducedMaxMIMO-LayersFR2 indicate the maximum number of MIMO layers preferred by the UE in FR1 and FR2, respectively. This information is indicated for each of the uplink and downlink.

[0103] In the overheatingAssistance IE in LTE and NR, reducedMaxCC is the same. In addition, in NR, reducedMaxBW and reducedMaxMIMO-Layers of the overheatingAssistance IE can be indicated for each of FR1 and FR2. As a reference, in the EN-DC scenario, the LTE frequency belongs to FR1, and the NR frequency belongs to FR1 or FR2.

[0104] The UE may send the RRC message UEAssistanceInformation, which stores the IE for reporting its preferred reconfiguration information to prevent overheating. In LTE and NR, the name of the RRC message is the same. When receiving the IE, the base station may perform reconfiguration (1c-40) based on the reconfiguration information recommended by the UE. In this case, the base station determines whether to actually perform the reconfiguration and the configuration values of the parameters for the reconfiguration.

[0105] The reconfiguration information is provided to the UE through RRCReconfiguration, which is an RRC message (1c-45).

[0106] The present disclosure proposes a method for reporting UE preferences in order to prevent overheating in the EN-DC scenario. The present disclosure proposes information included in the process of reporting preferences by the UE according to an option. Dual connectivity (DC) is a technology in which a UE is connected to two or more base stations to receive services. In this case, the two base stations can interoperate with each other and provide services to the UE within the capabilities of the UE through separate schedulers. The base station to which the PCell belongs is called the master node (MN), and the base station to which the PCell does not belong is called the secondary node (SN). Depending on the RAT to which the base station belongs, there are several types of dual connectivity. For example, dual connectivity between NR base stations is NR DC, dual connectivity between an LTE base station (PCell) - NR base station is EN-DC, and dual connectivity between an NR base station (PCell) - LTE base station is NE-DC. In the EN-DC scenario, the reducedMaxCC of the above-mentioned LTE overheatingAssistance IE introduced is also considered in the NR SCell, where the NR SCell is the SN. However, in addition to the reducedMaxCC, the UE cannot request to change the configuration information related to NR to prevent overheating. In the EN-DC case, the NR overheatingAssistance IE is not defined to be sent to the NR (SN). Therefore, the present disclosure aims to report information on the NR overheating assistance level to the network in the EN-DC case so that the MN and SN can be reconfigured to mitigate overheating. The present disclosure considers the following two options for the reporting process.

[0107] Option 1: Define additional information in the overheatingAssistance included in the UEAssistanceInformation which is an LTE RRC message. This information is forwarded to the SN.

[0108] Option 2: The UEAssistanceInformation which is an NR RRC message is sent to the SN via the MN or directly sent to the SN. If the signaling radio bearer 3 (SRB3) is configured, the UE can directly send a message to the SN, and if the SRB3 is not configured, the UE reports the received information of the NR overheatingAssistance to the MN using the UE InformationTransferMRDC which is an LTE RRC message. This information is forwarded to the SN.

[0109] Figure It is a message flow diagram showing the process of reporting predetermined information for reporting UE preferences to a base station to prevent overheating in the EN-DC (EUTRA-NR DC) scenario according to an embodiment of the present disclosure.

[0110] UE 1d-05 reports its capability information to MN 1d-10. The capability information includes the information for reporting UE preferences and the capabilities for supporting the DC scenario (1d-20).

[0111] MN 1d-10 configures EN-DC for the UE in coordination with SN 1d-15 (1d-25). During the coordination process, MN 1d-10 sends the UE's capability information (1d-30) to SN 1d-15 via a predefined inter-node message (CG-ConfigInfo).

[0112] UE 1d-05 reports auxiliary information to the network according to predefined conditions.

[0113] MN 1d-10 configures that if necessary, the auxiliary information can be reported to UE 1d-05 via a predefined RRC message (1d-35). MN 1d-10 can configure which information can be specifically sent. For example, the following information or values can be configured.

[0114] - Traditional LTE overheatingAssistanceIE via the LTE UEAssistanceInformation message

[0115] -(In the case of Option 1) LTE overheatingAssistance IE including additional information via the LTE UEAssistanceInformation message

[0116] -(In the case of Option 2) NR overheatingAssistance IE via the SRB3 or UEInformationTransferMRDC message

[0117] In addition to the existing prohibited timer (overheatingIndicationPrehibitTimer), MN 1d-10 also configures a new prohibited timer (overheatingIndicationPrehibitTimerExt) for the new procedure Option 1 or Option 2.

[0118] The new timer can operate independently of the traditional timer. That is, when the new LTE overheatingAssistance or NR overheatingAssistance is sent, the new timer starts running, and during the running of the timer, the information cannot be sent newly.

[0119] In another embodiment, when sending new overheatingAssistance information through the Option 1 procedure, the existing prohibition timer operates, but a new independent timer for the Option 2 procedure is introduced.

[0120] In another embodiment, a new prohibition timer for Option 1 or Option 2 is defined, and when sending traditional overheatingAssistance information, the traditional prohibition timer starts running; otherwise, when sending relevant information according to the new procedure, the new prohibition timer starts running. In this case, when any timer is running, no type of overheating assistance information can be sent.

[0121] In another embodiment, the traditional prohibition timer can be reused in the new procedure. In this case, regardless of the type of overheatingAssistance information reported, the timer starts running, and no type of overheatingAssistance information can be sent while the timer is running.

[0122] The traditional LTE overheatingAssistance IE and the new LTE overheatingAssistance IE or NR overheatingAssistance IE can be configured simultaneously.

[0123] Details included in the new LTE overheatingAssistance IE or NR overheatingAssistance IE in the EN-DC scenario will be described later.

[0124] UE 1d-05 triggers an operation for reporting preferences. For example, in the case where the UE is overheated beyond a predetermined threshold, the UE determines the reporting preferences.

[0125] When UE 1d-05 reports preferences for overheating prevention through the Option 1 procedure, UE 1d-05 adds additional information to the LTE UE Assistance Information message in addition to the traditional overheatingAssistance IE. The added information is the information included in the NR overheatingAssistance IE except for the reducedMaxCC IE. That is, according to the Option 1 procedure, the additional information included in the message reported by the UE can be configured, as shown in Table 3.

[0126] [Table 3]

[0127]

[0128] The information in [Table 3] is stored in an IE separated from the traditional overheatingAssistance IE in the UEAssistanceInformation message. UE 1d-05 sends the UEAssistanceInformation message containing this information to MN 1d-10 (1d-40). The traditional overheatingAssistance IE and the IE containing the new information can be included in the UEAssistanceInformation message simultaneously. During the procedure of Option 1, the traditional prohibition timer is reused. Upon receiving the message, MN 1d-10 forwards the FR2 specific information (or SN specific information) to SN 1d-15 (1d-45). For example, the reducedMaxBW-FR2 IE and the reducedMaxMIMO-LayersFR2IE are FR2 specific information and need to be recognized by SN 1d-15. Since SN 1d-15 may have SCell driven in FR1, when the SCell driven in FR1 is configured to SN 1d-15, the FR1 specific information, the reducedMaxBW-FR1 IE and the reducedMaxMIMO-LayersFR1 IE need to be forwarded to SN 1d-15. Alternatively, the coordination information can be sent to SN 1d-15 by MN 1d-10. For example, considering the reduced BW in MN 1d-10, the processed reducedMaxBW-FR1 information can be sent to SN 1d-15. SN 1d-15 can perform reconfiguration based on the information sent, and, if necessary, SN1d-15 notifies MN 1d-10 of this or requests reconfiguration, so that a negotiation procedure (1d-50) can be performed between MN 1d-10 and SN 1d-15.

[0129] When the UE 1d-05 reports its preference for overheating prevention through the Option 2 procedure, the UE 1d-05 determines whether SRB3 is configured to the SN 1d-15 (1d-55). When SRB3 is configured, the UE 1d-05 directly sends the NR UEAssistanceInformation (1d-60) containing the NRoverheatingAssistance IE to the SN 1d-15. Otherwise, if SRB3 is not configured, the UE 1d-05 stores the overheatingAssistance information in the ULInformationTransferMRDC message and sends the ULInformationTransferMRDC message to the MN 1d-10 (1d-65). The MN 1d-10 forwards all received information or FR2-specific information (or SN-specific information) to the SN 1d-15 (1d-70). When SRB3 is configured and the SN 1d-15 directly receives the overheatingAssistance information, the FR1-specific information (or MN-specific information) can be forwarded to the MN 1d-10 (1d-75). The FR1-specific information is the reducedMaxBW-FR1 IE and the reducedMaxMIMO-LayersFR1IE. The reducedMaxCC is also forwarded to the MN 1d-10 for coordination with the MN 1d-10.

[0130] The Option 2 procedure and the existing LTE overheatingAssistance reporting procedure (using the LTE UEAssistanceInformation message) can be configured simultaneously. In this case, specific information can be sent to MN 1d-10 and SN 1d-15 using the same value or different values. For example, reducedMaxCC is defined in both the existing LTE overheatingAssistance IE and the NR overheatingAssistance IE. This may lead to confusion in MN 1d-10 or SN 1d-15 and unnecessarily complicate the coordination process. Therefore, when the Option 2 procedure and the existing overheatingAssistance reporting procedure are configured simultaneously, reducedMaxCC can be restricted to always be stored in the LTE overheatingAssistance IE, or restricted to be stored in only one of the LTE overheatingAssistance IE and the NR overheatingAssistance IE. Alternatively, it can be configured in which IE MN 1d-10 stores it. When only the Option 2 procedure is configured, reducedMaxCC is stored in the NR overheatingAssistance IE.

[0131] MN 1d-10 and SN 1d-15 that have obtained the above information perform coordination (1d-80). MN 1d-10 finalizes the number of CCs to be reduced for MN 1d-10 and SN 1d-15 to prevent overheating. Additionally, when SN 1d-15 is also using FR1, MN 1d-10 finalizes the FR1 BW of MN 1d-10 and SN 1d-15 to be reduced to prevent overheating.

[0132] MN 1d-10 and SN 1d-15 trigger information-based reconfiguration (1d-85, 1d-90). MN 1d-10 and SN 1d-15 reconfigure UE 1d-05 (1d-95).

[0133] As another embodiment, a method for negotiating Option 1 and Option 2 can be proposed.

[0134] The ReducedMaxBW-FR1 IE and ReducedMaxMIMO-LayersFR1 IE information are added to LTEoverheatingAssistance. This information is stored in the LTE UEAssistanceInformation message and sent to MN 1d-10. However, the NR overheatingAssistance information other than the reducedMaxCC IE, reducedMaxBW-FR1 IE, and reducedMaxMIMO-LayersFR1 IE is sent through the procedure of Option 2.

[0135] To reduce the complexity of the coordination process between MN 1d-10 and SN 1d-15, the reducedMaxCC and reducedMaxBW-FR1 information can be reported separately for each of MN 1d-10 and SN 1d-15. That is, the reducedMaxCC and reducedMaxBW-FR1 information reported in LTEoverheatingAssistance is considered to be limited to MN 1d-10, and the reducedMaxCC and reducedMaxBW-FR1 information reported in NR overheatingAssistance through the procedure of Option 2 is considered to be limited to SN 1d-15.

[0136] ​ It is a flowchart showing the UE operation in the Option 1 procedure according to an embodiment of the present invention.

[0137] In step 1e-05, the UE reports its capability information to the MN. The capability information includes the capability information reporting the UE preference and the supported DC scenarios.

[0138] In step 1e-10, the UE receives the configuration of EN-DC from the MN.

[0139] In step 1e-15, the UE is configured by the MN to be able to report both legacy and new overheating assistance information. The configuration to be able to report new overheating assistance information may mean that the legacy overheatingAssistance IE can also be reported.

[0140] In step 1e-20, the UE identifies that reconfiguration is needed to prevent overheating.

[0141] In step 1e-25, the UE configures a new IE, which includes the traditional overheatingAssistance IE, reducedMaxBW-FR1 IE, reducedMaxBW-FR2 IE, reducedMaxMIMO-LayersFR3, and reducedMaxMIMO-LayersFR3. When the new IE can also configure the information stored in the overheatingAssistance IE, there is no need to configure the traditional IE.

[0142] In step 1e-30, the UE sends a UEAssistanceInformation message containing this IE to the MN and starts the corresponding inhibit timer. The message is SRB1.

[0143] ​ It is a flowchart showing the UE operations in Option 2 procedure according to an embodiment of the present invention.

[0144] In step 1f-05, the UE reports its capability information to the MN. The capability information includes the information about reporting UE preferences and the supported DC scenarios.

[0145] In step 1f-10, the UE receives the configuration of EN-DC from the MN.

[0146] In step 1f-15, the UE is configured by the MN to be able to report both traditional and new overheating assistance information. The configuration to be able to report new overheating assistance information may mean that the traditional overheatingAssistance IE can also be reported.

[0147] In step 1f-20, the UE identifies that reconfiguration is needed to prevent overheating.

[0148] In step 1f-25, the UE configures the NR overheatingAssistance IE. When the reporting of the LTE overheatingAssistance IE is also configured, specific information such as reducedMaxCC is not included in the NR overheatingAssistance IE.

[0149] In step 1f-30, the UE determines whether SRB3 has been configured.

[0150] In step 1f-35, the UE sends a UEAssistanceInformation message containing this IE to the SN and starts the corresponding inhibit timer. The message is SRB3.

[0151] In step 1f-40, the UE sends a UL Information Transfer MRDC message containing the IE to the SN and starts the corresponding prohibition timer. This message is SRB1.

[0152] ​ is a flowchart showing the operation of a base station according to an embodiment of the present invention.

[0153] In step 1g-05, the base station (MN or SN) receives UE capability information from the UE.

[0154] In step 1g-10, the base station sends an otherConfig IE including an overheating Assistance Config IE and a power Preference Assistance Config IE to the UE.

[0155] In step 1g-15, the base station receives a UE Assistance Information message from the UE. This message may include an overheating Assistance IE or a power Preference Assistance IE.

[0156] In step 1g-20, the base station configures configuration parameters based on the received information.

[0157] In step 1g-25, the base station stores the configuration information in an RRC Reconfiguration message and sends the RRC Reconfiguration message to the UE.

[0158] ​ is a diagram showing the DRX operation in the existing LTE technology.

[0159] Reference ​ , discontinuous reception (DRX) is applied to minimize the power consumption of the UE and is a technology for monitoring only in a predetermined physical downlink control channel (PDCCH) so that the UE can obtain scheduling information. DRX can operate in both the standby mode and the connected mode, and its operation methods are slightly different. This disclosure relates to the connected mode.

[0160] To obtain scheduling information, the UE continuously monitoring the PDCCH may result in high power consumption. The basic DRX operation has a DRX cycle (2a-00), and the UE can monitor the PDCCH only during the on-duration (2a-05). In the connected mode, two values of long DRX and short DRX can be configured for the DRX cycle (2a-00). In general, the long DRX cycle is applied, and if necessary, the base station can use the Medium Access Control (MAC) control element (CE) to trigger the short DRX cycle. After a certain time, the UE can change from the short DRX cycle to the long DRX cycle. The initial scheduling information of a specific UE is provided only in the predetermined PDCCH. Therefore, the UE can minimize the power consumption by periodically monitoring only this PDCCH.

[0161] When receiving scheduling information (2a-10) about a new packet through the PDCCH during the on-duration (2a-05), the UE starts the DRX Inactivity Timer 2a-15. The UE remains active during the DRX Inactivity Timer 2a-15. That is, the UE continues the PDCCH monitoring. In addition, the UE starts the Hybrid Automatic Repeat reQuest (HARQ) Round-Trip Time (RTT) Timer 2a-20. The HARQ RTT Timer 2a-20 is applied to prevent the UE from unnecessarily monitoring the PDCCH during the HARQ RTT time, and the UE does not need to perform PDCCH monitoring during the working time of the HARQ RTT Timer 2a-20. However, when the DRX Inactivity Timer 2a-15 and the HARQ RTT Timer 2a-20 are working simultaneously, the UE continues the PDCCH monitoring based on the DRX Inactivity Timer 2a-15. When the HARQ RTT Timer 2a-20 expires, the DRX Retransmission Timer 2a-25 is started. When the DRX Retransmission Timer 2a-25 is working, the UE shall perform PDCCH monitoring. Generally, during the working time of the DRX Retransmission Timer 2a-25, scheduling information (2a-30) for HARQ retransmission can be received. When the scheduling information is received, the UE immediately stops the DRX Retransmission Timer 2a-25 and starts the HARQ RTT Timer 2a-20 again. The above operations can continue until the packet (2a-35) is successfully received.

[0162] Configuration information related to DRX operations in the connected mode is transmitted to the UE via an RRCConnectionReconfiguration message. The duration timer, DRX inactivity timer, and DRX retransmission timer are defined by the number of PDCCH subframes. After the timer starts, the timer expires when the configured number of subframes defined as PDCCH subframes have passed. In the Frequency Division Duplex (FDD) mode, all downlink subframes belong to PDCCH subframes, while in the Time Division Duplex (TDD) mode, downlink subframes and special subframes correspond to them. In TDD, downlink subframes, uplink subframes, and special subframes exist in the same frequency band. Downlink subframes and special subframes are considered PDCCH subframes.

[0163] The base station can configure two states of long DRX and short DRX for the UE. Considering the power preference indication information reported from the UE, UE mobility record information, and the characteristics of the configured Data Radio Bearer (DRB), the base station can use one of these two states. The transition between the two states can be achieved whether a specific timer expires or when the base station sends a specific MAC CE to the UE.

[0164] In the existing LTE technology, since only two DRX cycles can be configured, it is impossible to dynamically change the DRX cycle according to various DRB characteristics, service patterns, and buffer states.

[0165] In the present disclosure, multiple DRXs can be configured, and one or more serving cells apply one of the multiple configured DRXs. In particular, to minimize UE power consumption, a group consisting of one or more serving cells corresponds to one DRX, and the serving cells belonging to the group apply that DRX. For example, in the case where serving cells operate in the same Radio Frequency (RF) chain, it is preferable to apply the same DRX to minimize UE power consumption. In the case of Carrier Aggregation (CA), the base station can provide the UE with the DRX applied to the serving cells belonging to Frequency Range 1 (FR1) and the DRX applied to the serving cells belonging to Frequency Range 2 (FR2) respectively. In the present disclosure, the group information is referred to as a DRX group.

[0166] ​ is a message flow diagram showing a method for providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0167] Refer to ​, The UE 2b-05 can report its capability information to the base station 2b-10 (step 2b-15). The capability information may include information (indicator) indicating that the UE 2b-05 can apply multiple DRXs when multiple serving cells are configured. The base station 2b-10 can configure multiple DRX configuration information to be configured for the UE 2b-05 (step 2b-20). In the present disclosure, it is considered that two DRX configuration information are provided to the UE 2b-05. In this case, it is necessary to configure to which serving cells each DRX configuration information will be applied. The base station 2b-10 can enable the UE 2b-05 to apply the first DRX configuration information to the serving cells belonging to FR1, and apply the second DRX configuration information to the serving cells belonging to FR2. Alternatively, the base station 2b-10 can define an indicator indicating which DRX configuration information each serving cell configuration information applies. Or, the UE 2b-05 can determine which serving cells are to apply the DRX configuration information.

[0168] The base station 2b-10 can configure the SCell together with multiple DRX configuration information to the UE 2b-05 in the connected mode (step 2b-25). According to one embodiment, the configuration information may be an RRCReconfiguration message. In this case, the UE 2b-05 can apply the DRX configuration information corresponding to each serving cell (step 2b-30).

[0169] The UE 2b-05 can send an RRCReconfigurationComplete message as a response message to the RRCReconfiguration to the base station 2b-10 (step 2b-35). According to one embodiment, the serving cell information (e.g., DRX group information) applying each DRX configuration information can be stored in the RRCReconfigurationComplete message.

[0170] The base station 2b-10 can change the applied DRX period through a predetermined MAC CE (step 2b-40). For example, when a long DRX and a short DRX period are configured, the DRX command MAC CE can be used to change the running long DRX to a short DRX, and the long DRX command MAC CE can be used to change the running short DRX to a long DRX. The UE 2b-05 can apply the configured long DRX or short DRX according to the received MAC CE.

[0171] The present disclosure proposes a method for applying MAC CE considering multiple DRX configuration information. For example, the present disclosure considers two cases. In the first scenario, both the first DRX configuration information and the second DRX configuration information can provide long DRX and short DRX. In the second scenario, the first DRX configuration information can provide long DRX and short DRX, but the second DRX configuration information can only provide short DRX (or long DRX). In this case, in the present disclosure, the cell group to which the first DRX configuration information is applied is called the first DRX group, and the cell group to which the second DRX configuration information is applied is called the second DRX group. At least one serving cell should belong to each DRX group. According to one embodiment, it can be considered that the PCell belongs to the first DRX group.

[0172] ​ FIG. is a diagram showing the operation of a UE when receiving a (long) DRX command MAC CE according to an embodiment of the present disclosure.

[0173] When long DRX and short DRX cycles are configured, the DRX command MAC CE can be used to change the running long DRX to short DRX, and the long DRX command MAC CE can be used to change the running short DRX to long DRX.

[0174] ​ (a) is a diagram showing the operation of a UE when receiving a DRX command MAC CE.

[0175] The UE can receive the DRX configuration information stored in the DRX-Config (configuration) IE (information element) at a predetermined time point and apply the DRX configuration information (2c-05). By default, the UE can perform DRX operations using the configured long DRX cycle. When the drx-onDurationTimer timer or the drx-InactivityTimer timer is running (2c-10), the UE is in the active time (2c-15) and can monitor the PDCCH during this period. When the UE receives a DRX command MAC CE at a predetermined time point (2c-20), the UE can stop the running drx-onDurationTimer timer and drx-InactivityTimer timer at the first symbol after receiving the MAC CE (2c-25), (re)start the drx-ShortCycleTimer, and use the short DRX cycle (2c-30). When the running drx-ShortCycleTimer stops (2c-35), the UE can use the long DRX cycle (2c-40).

[0176] ​(b) is a diagram showing the operations of the UE when the UE receives a long DRX command MAC CE.

[0177] The UE may receive the DRX configuration information stored in the DRX-Config IE at a predetermined time point and apply the DRX configuration information (2c-45). By default, the UE may use the configured long DRX cycle to perform DRX operations. When the drx-onDurationTimer timer or the drx-InactivityTimer timer is running (2c-50), the UE is in the active time (2c-55), and may monitor the PDCCH during this time period. When the UE receives a long DRX command MAC CE at a predetermined time point (2c-60), the UE may stop the running drx-onDurationTimer timer, drx-InactivityTimer timer, and drx-ShortCycleTimer (2c-65, 2c-70), and use the long DRX cycle (2c-70).

[0178] When using the short DRX cycle, after the drx-SlotOffset has passed, in the subframe that satisfies the equation [(SFN × 10) + subframe number] modulo (drx-ShortCycle) = (drx-startOffset) modulo (drx-ShortCycle), the UE starts the drx-onDurationTimer.

[0179] When using the long DRX cycle, after the drx-SlotOffset has passed, in the subframe that satisfies the equation [(SFN × 10) + subframe number] modulo (drx-Long Cycle) = drx-start Offset, the UE starts the drx-onDurationTimer.

[0180] The long DRX command MAC CE and the DRX command MAC CE are each configured with a sub-header having a corresponding local channel identifier (LCID), and their payloads are zero bits. That is, the MAC CE is configured with a sub-header. The LCID values corresponding to the MAC CE can be seen in [Table 4].

[0181] [Table 4]

[0182] Table 6.2.1-1 LCID Values for DL-SCH

[0183]

[0184]

[0185] ​ It is a flowchart showing UE operations in a method of applying a new DRX command MAC CE in a first scenario according to an embodiment of the present disclosure.

[0186] Reference ​ , a new MAC CE is proposed to switch the long DRX cycle and the short DRX cycle in the second DRX configuration information. A new LCID is assigned to the new MAC CE, and the LCID can be used to distinguish the new MAC CE from the traditional MAC CE. Since the purpose of the new MAC CE is to switch the DRX cycle, the new MAC CE is a MAC CE that only configures a sub-header storing the LCID without a payload. When receiving the new MAC CE, the UE operation can have several options.

[0187] Option 1: To switch the long DRX cycle and the short DRX cycle in the second DRX configuration information, a new long DRX command MAC CE and a DRX command MAC CE can be introduced. In this case, a new LCID can be assigned to each new MAC CE. The traditional long DRX command MAC CE and DRX command MAC CE are used to switch the long DRX and short DRX in the first DRX configuration information. In Option 1, since the MAC CE for switching the DRX cycle of the first DRX configuration information and the MAC CE for switching the DRX cycle of the second DRX configuration information are defined separately, the information included in each MAC CE can be applied regardless of the serving cell that sends the MAC CE.

[0188] - Option 2: The traditional long DRX command MAC CE and DRX command MAC CE can be used to switch the DRX cycle of the DRX group to which the serving cell that sends the MAC CE belongs. However, the new long DRX command MAC CE and DRX command MAC CE can be used to switch the DRX cycle of another DRX group to which the serving cell that sends the MAC CE does not belong. In this case, a new LCID can be assigned to each new MAC CE. The advantage of Option 2 is that by sending a DRX command MAC CE (applied to another DRX group that is applying the long DRX cycle) from the serving cell that is applying the short DRX cycle, the long DRX cycle can be quickly converted to the short cycle.

[0189] Based on Option 2, the order of UE operations is as follows.

[0190] In step 2d-05, the UE can report its capability information to the base station. The capability information can include an indicator indicating that the UE can apply multiple DRXs when multiple serving cells are configured.

[0191] In step 2d-10, the UE may receive the configuration of the SCell and multiple DRX configuration information from the base station.

[0192] In step 2d-15, the UE may receive a (long) DRX command MAC CE from the base station.

[0193] In step 2d-20, the UE determines the LCID of the received MAC CE.

[0194] When the LCID indicates a legacy (long) DRX command MAC CE, the UE may, in step 2d-25, switch the DRX cycle of the DRX group to which the serving cell that transmits the MAC CE belongs according to the MAC CE. Further, the UE may perform the operations described in ​ .

[0195] When the LCID indicates a new (long) DRX command MAC CE, the UE may, in step 2d-30, switch the DRX cycle of the DRX group to which the serving cell that does not transmit the MAC CE belongs according to the MAC CE. Further, the UE may perform the operations described in ​ .

[0196] ​ is a flowchart showing UE operations in a method of reusing a legacy DRX command MAC CE in a first scenario according to an embodiment of the present disclosure.

[0197] The LCID is a resource with a limited quantity and needs to be conserved. Therefore, it is also useful to reuse the legacy (long) DRX command MAC CE without defining a new LCID. The operations for this purpose may have the following options.

[0198] - Option 3: The DRX cycle applied to the DRX group to which the serving cell that transmits the legacy (long) DRX command MAC CE belongs may be switched according to the MAC CE. For example, in order to switch the DRX cycle provided by the second DRX configuration information, the base station may send a legacy (long) DRX command MAC CE to the UE through a serving cell in the second DRX group that applies the second DRX configuration information.

[0199] Option 4: When the UE receives a legacy (long) DRX command MAC CE, the UE may switch the DRX cycles provided by the first DRX configuration information and the second DRX configuration information. When the DRX cycle indicated by the MAC CE has been applied, the UE may ignore the MAC CE for the DRX group to which the corresponding DRX cycle has been applied.

[0200] Based on Option 3, the operation sequence of the UE is as follows.

[0201] In step 2e-05, the UE may report its capability information to the base station. The capability information may include an indicator indicating that the UE may apply multiple DRXs when multiple serving cells are configured.

[0202] In step 2e-10, the UE may receive the configuration of the SCell and multiple DRX configuration information from the base station.

[0203] In step 2e-15, the UE may receive a legacy (long) DRX command MAC CE from the base station.

[0204] In step 2e-20, the UE may determine from which DRX group the serving cell that received the MAC CE belongs.

[0205] When a legacy (long) DRX command MAC CE is received from a serving cell belonging to the first DRX group, in step 2e-25, the UE may switch the DRX cycle of the first DRX group to which the serving cell that sent the MAC CE belongs according to the MAC CE. In addition, the UE may perform the operations described in ​ .

[0206] When a legacy (long) DRX command MAC CE is received from a serving cell belonging to the second DRX group, in step 2e-30, the UE may switch the DRX cycle of the second DRX group to which the serving cell that sent the MAC CE belongs according to the MAC CE. The UE may perform the operations described in ​ .

[0207] ​ is a flowchart showing UE operations for activating or deactivating second DRX configuration information in a second scenario according to embodiments of the present disclosure.

[0208] In the second scenario, only one DRX cycle is provided in the second DRX configuration information. Therefore, there is no need to switch between the short DRX cycle and the long DRX cycle. Therefore, when the DRX cycle in the second DRX configuration information is not used, an operation for releasing the DRX cycle may be required.

[0209] The second DRX configuration information can be established through a dedicated RRC message. When the DRX cycle in the second DRX configuration information is no longer used, the base station can release the second DRX configuration information to the UE through an RRC message. However, in addition to the DRX cycle, the second DRX configuration information also includes other DRX parameters, and other parameters can continue to be used. Therefore, it may be inefficient to release all the second DRX configuration information using an RRC message. In addition, it takes some time for the UE to apply the establishment or release of the configuration information provided in the RRC message. Due to the nature of DRX operations, it is important to apply the establishment or release of the configuration information at an accurate time point.

[0210] Therefore, the present disclosure proposes a method for establishing and releasing the second DRX configuration information using an RRC message, introducing a new MAC CE and using a new MAC CE to activate or deactivate the configured DRX cycle. The new MAC CE can be a DRX activation MAC CE for activating the DRX cycle configured in the second DRX configuration information or a DRX deactivation MAC CE for deactivating the DRX cycle configured in the second DRX configuration information. A new LCID is assigned to each MAC CE, and its payload can be zero bits.

[0211] Reference ​ , in step 2f-05, the UE can report its capability information to the base station. The capability information can include an indicator indicating that the UE can apply multiple DRXs when multiple serving cells are configured.

[0212] In step 2f-10, the UE can receive the configuration of the SCell and multiple DRX configuration information from the base station.

[0213] In step 2f-15, the UE can receive a DRX activation MAC CE from the base station.

[0214] In step 2f-20, the UE can use the DRX cycle provided in the second DRX configuration information according to the DRX activation MAC CE. According to one embodiment, when receiving the second DRX configuration information, the UE can use the DRX cycle provided by the second DRX configuration information regardless of whether a MAC CE is received.

[0215] In step 2f-25, the UE can receive a DRX deactivation MAC CE from the base station.

[0216] In step 2f-30, the UE can stop using the DRX cycle provided in the second DRX configuration information according to the DRX deactivation MAC CE. According to one embodiment, when the second DRX configuration information is released by a predetermined RRC message, the DRX cycle can no longer be used.

[0217] As with​ As described in the related part, in the existing LTE technology, only two DRX cycles can be configured, so the DRX cycle cannot be dynamically changed according to various DRB characteristics, service modes, buffer states, etc.

[0218] In the present disclosure, multiple DRXs can be configured, and one or more serving cells apply one of the multiple configured DRXs. In particular, in order to minimize UE power consumption, a group composed of one or more serving cells corresponds to one DRX, and the serving cells belonging to the group apply the DRX. For example, in the case where serving cells operate on the same radio frequency (RF) chain, it is preferable to apply the same DRX to minimize UE power consumption. In the case of carrier aggregation (CA), the base station can provide the UE with the DRX applied to the serving cells belonging to frequency range 1 (FR1) and the DRX applied to the serving cells belonging to frequency range 2 (FR2) respectively. In the present disclosure, the group information is referred to as a DRX group.

[0219] ​ is a message flow diagram showing a method for providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0220] Refer to ​ , in step 3a-15, the UE 3a-05 can report its capability information to the base station 3a-10. The capability information may include information (indicator) indicating that the UE 3a-05 can apply multiple DRXs when multiple serving cells are configured. In step 3a-20, the base station 3a-10 can configure multiple DRX configuration information to be configured for the UE 3a-05. In the present disclosure, it is considered that two DRX configuration information are provided to the UE 3a-05. In this case, it is necessary to configure which serving cells each DRX configuration information will be applied to. The present disclosure considers the following options.

[0221] - Option 1: The serving cells belonging to FR1 apply the first DRX configuration information, and the serving cells belonging to FR2 apply the second DRX configuration information

[0222] - Option 2: Define an indicator indicating which DRX configuration information each serving cell configuration information applies to

[0223] - Option 3: The UE 3a-05 determines which serving cells apply the two DRX configuration information

[0224] In the case of Option 1, since the DRX configuration information to be automatically applied is determined according to the FR to which the serving cell belongs, the base station 3a-10 does not need to separately send an indicator indicating this to the UE 3a-05. In Option 1, it is assumed that the UE 3a-05 has a separate RF modem for each of FR1 and FR2. Therefore, in other cases, the required performance improvement may not be achieved.

[0225] In the case of Option 2, the base station 3a-10 should pre-identify the information of the DRX group that is beneficial for the UE 3a-05 to save power consumption. For this purpose, the UE 3a-05 can report it to the base station 3a-10 through the capability information reporting process or the predetermined reporting process. The base station 3a-10 can identify the information of the DRX group that is beneficial for the UE 3a-05 to save power consumption based on the reported information from the UE 3a-05.

[0226] In the case of Option 3, the base station 3a-10 sends only two DRX configuration information (without sending DRX group information) to the UE 3a-05 through the RRCReconfiguration message. According to one embodiment, it can be considered that the PCell always applies the first DRX configuration information. The UE 3a-05 sends the serving cell information (e.g., DRX group information) to which each DRX configuration information is applied to the base station 3a-10 through the RRCReconfigurationComplete message as a response message to the RRCReconfiguration message. In Option 3, since the UE 3a-05 directly indicates the serving cell to which each DRX configuration information is applied in consideration of the configured SCell, the UE 3a-05 does not need to pre-report the information necessary for configuring the DRX group to the base station 3a-10.

[0227] The base station 3a-10 can configure the SCell and multiple DRX configuration information for the UE 3a-05 in the connected mode (step 3a-25). In this case, the UE 3a-05 can apply the DRX configuration information corresponding to each serving cell (step 3a-30). The UE 3a-05 can send the RRCReconfigurationComplete (3a-35) as a response message to the RRCReconfiguration message to the base station 3a-10. The serving cell information (e.g., DRX group information) to which each DRX configuration information is applied can be stored in this message.

[0228] Although not shown, according to an embodiment, when reconfiguration of DRX configuration is required, UE 3a-05 may request the base station 3a-10 to reconfigure the DRX configuration. According to an embodiment, UE 3a-05 may request the base station 3a-10 to update the SCell list. In this case, the reconfiguration and update requests may be made through a UE assistance information message.

[0229] ​ is a flowchart showing operations of a UE according to an embodiment of the present disclosure.

[0230] Reference ​ , at step 3b-05, the UE may report its capability information to the base station. The capability information includes an indicator indicating that the UE can apply multiple DRXs when multiple serving cells are configured.

[0231] At step 3b-10, the UE may receive the configuration of the SCell from the base station. In this case, the UE may also receive multiple DRX configuration information from the base station, and the SCell configuration information may include an indicator indicating the DRX to be applied to each serving cell. According to one embodiment, the PCell may always apply the first DRX configuration information.

[0232] At step 3b-15, the UE may apply the configured DRX to the serving cells belonging to the corresponding group.

[0233] Although not shown, according to an embodiment, when the UE needs to reconfigure the DRX configuration, the UE may request the base station to reconfigure the DRX configuration. According to an embodiment, the UE may request the base station to update the SCell list. In this case, the reconfiguration and update requests may be made through a UE assistance information message.

[0234] ​ is a flowchart showing operations of a base station according to an embodiment of the present disclosure.

[0235] Reference ​ , at step 3c-05, the base station may receive a report of capability information from at least one UE. The capability information may include an indicator indicating that the UE can apply multiple DRXs when multiple serving cells are configured.

[0236] At step 3c-10, in order to reduce the power consumption of the UE, the base station may configure multiple DRX configuration information. A method of configuring the second DRX configuration information together with the existing first DRX configuration information may consider the following several options. The existing DRX configuration information may be the same as that shown in [Table 5].

[0237] [Table 5]

[0238]

[0239] - Option 1: Define separate DRX-Config and DRX-ConfigFR2

[0240] - Option 2: Define a separate DRX-Config configured only with specific parameters

[0241] ■ Some parameters, for example, only drx-InactivityTimer, drx-onDurationTimer, drx-ShortCycleTimer, and drx-ShortCycle are provided as the second DRX configuration information, and DRX parameters not provided separately can be applied as parameters in the legacy DRX configuration.

[0242] ■ Multiples of the long cycle or short cycle in the legacy DRX configuration can be applied to the short cycle in the second DRX configuration information.

[0243] Option 3: The second DRX configuration information can be indicated by providing scaling information for the parameters stored in the legacy DRX configuration. The scaling method can reduce the signaling overhead when providing the second DRX configuration information.

[0244] ■ Scaling information is provided for each parameter stored in the legacy DRX-Config

[0245] ■ The same scaling information is provided for some parameters stored in the legacy DRX-Config, or different scaling information is provided for each specific parameter group<X

[0246] ■ Apply the parameters in the legacy DRX configuration to the DRX parameters for which scaling is not provided separately.

[0247] ■ For example, when the short DRX value in the existing DRX configuration information is 8 ms and the corresponding scaling value is indicated as 0.5, the short DRX in the second DRX configuration information is 4 ms.

[0248] In step 3c-15, the base station may configure an SCell to the UE in the connected mode.

[0249] In step 3c-20, the base station may receive preferred DRX group information from the UE.

[0250] In step 3c-25, the base station may apply the configured DRX to the serving cells belonging to the corresponding group.

[0251] ​ is a diagram showing a method for supporting wake-up signaling when multiple DRX configuration information is provided according to an embodiment of the present disclosure.

[0252] To reduce power consumption, when DRX is configured, the UE monitors the PDCCH at each indicated DRX cycle. However, scheduling information regarding the corresponding UE is not always included in each monitored PDCCH. Therefore, to further reduce power consumption, the base station may transmit a Wake-up Signal (WUS) with a predetermined gap offset before the onDuration, and the WUS indicates whether the UE monitors the PDCCH at the upcoming onDuration time point.

[0253] Reference ​ , the UE receives the WUS (3d-05), and when the WUS indicates wake-up, the UE may monitor the PDCCH at the onDuration time point after the WUS (3d-10). The wake-up indicator in the WUS may be applied to all serving cells. Therefore, in the case of dual connectivity, the WUS may be transmitted from the PCell and may also be transmitted from the Primary Secondary Cell (PSCell) of the Secondary Cell Group (SCG) cell. In other words, it can be considered that there is a corresponding WUS for each DRX. The WUS is only applied in long DRX but may not be applied in short DRX.

[0254] In the present disclosure, when the first DRX and the second DRX are configured simultaneously, a method for applying the WUS is required.

[0255] The first method is to maintain one WUS as shown in ​ (a), but introduce indicators in the WUS that respectively indicate whether to wake up in the first DRX and the second DRX. That is, the first wake-up indicator may be applied to the first DRX, and the second wake-up indicator may be applied to the second DRX. When the long DRX is not separately defined in the second DRX configuration information, the second wake-up indicator may not be required. When a separate long DRX is defined in the second DRX configuration information and the periods of the first long DRX and the second long DRX are different, in the case where a long DRX different from the long DRX applied to the PCell is applied in the serving cell, there may not be a corresponding WUS at each specific onDuration time point (3d-30). In this case, one of the following options may be considered.

[0256] - By default, the UE may not monitor the PDCCH in this onDuration (3d-30).

[0257] Or

[0258] - When there is no WUS corresponding to dedicated signaling, the base station may pre-configure for the UE whether to wake up in the upcoming onDuration (3d-30). Or,

[0259] - When there is no corresponding WUS, the base station can pre-identify this; thus, the base station can send a wake-up indicator for this onDuration(3d-30) to the UE in a previous WUS.

[0260] In another case, when the DRX group to which the PCell belongs is short DRX and another DRX group is long DRX, the PCell still sends a WUS and considers whether to apply it. In this case, one of the following options can be considered.

[0261] - According to the rules of the short DRX applied to the DRX group to which the PCell belongs, the WUS may not be applied to other DRX groups. In this case, in the serving cell of another DRX group, the UE can monitor the PDCCH for each long DRX.

[0262] When at least one of the two DRX groups is long DRX, a WUS is sent, and the WUS can be applied to the DRX group to which the long DRX is applied. In this case, the WUS is sent from the PCell, and the WUS transmission timing can consider the onDuration time point in the DRX group to which the long DRX is applied. That is, when only the short DRX is applied in the two DRX groups, the WUS is not applied, and the UE may not monitor the WUS.

[0263] The second method is to configure a separate WUS(3d-35) for each DRX group, as shown in ​ (b). For this purpose, in the DRX group to which the PCell belongs, the WUS is sent from the PCell as described above, and in the DRX group to which the PCell does not belong, the WUS can be sent from the serving cell configured by the base station. When the serving cell is configured, this configuration can be indicated together.

[0264] ​ is a flowchart showing the operation of a UE supporting wake-up signaling when multiple DRX configuration information is provided according to an embodiment of the present disclosure.

[0265] Refer to ​ , in step 3e-05, when multiple DRXs are configured, the UE can send capability information including an indicator indicating that it can support WUS to the base station.

[0266] In step 3e-10, the base station can provide DRX configuration information and WUS configuration information to the UE, and the UE operates based on the above information.

[0267] In step 3e-15, the UE can determine whether multiple DRX configuration information is provided.

[0268] In step 3e-20, if multiple DRX configuration information is not provided to the UE, the UE can monitor the WUS and receive the WUS including a wake-up indicator.

[0269] In step 3e-25, the UE can monitor the PDCCH during the upcoming onDuration.

[0270] In step 3e-30, if multiple DRX configuration information is provided to the UE, the UE can monitor the WUS and receive the WUS including wake-up indicators corresponding to each DRX group.

[0271] In step 3e-35, the UE can monitor the PDCCH during the upcoming onDuration in the DRX group corresponding to the wake-up indicator.

[0272] As described in the part related to ​ Since in the existing LTE technology, only two DRX cycles can be configured, the DRX cycle cannot be dynamically changed according to various DRB characteristics, service modes, buffer states, etc.

[0273] In the present disclosure, multiple DRXs can be configured, and one of the multiple configured DRXs is applied to one or more serving cells. In particular, to minimize UE power consumption, a group consisting of one or more serving cells corresponds to one DRX, and the serving cells belonging to the group apply the DRX. For example, in the case where the serving cells operate on the same radio frequency (RF) chain, it is preferable to apply the same DRX to minimize UE power consumption. In the case of carrier aggregation (CA), the base station can separately provide the UE with the DRX applied to the serving cells belonging to frequency range 1 (FR1) and the DRX applied to the serving cells belonging to frequency range 2 (FR2). In the present disclosure, the group information is referred to as a DRX group.

[0274] ​ is a message flow diagram showing a method for providing multiple DRX configuration information according to an embodiment of the present disclosure.

[0275] Refer to ​, in step 4a-15, the UE 4a-05 may report its capability information to the base station 4a-10. The capability information may include information (indicator) indicating that the UE 4a-05 can apply multiple DRXs when multiple serving cells are configured. In step 4a-20, the base station 4a-10 may configure multiple DRX configuration information to be configured for the UE 4a-05. In the present disclosure, it is considered that two DRX configuration information are provided to the UE 4a-05. In this case, it is necessary to configure to which serving cells each DRX configuration information will be applied. The base station 4a-10 may enable the UE 4a-05 to apply the first DRX configuration information to the serving cells belonging to FR1 and the second DRX configuration information to the serving cells belonging to FR2. Alternatively, the base station 4a-10 may define an indicator indicating which DRX configuration information each serving cell configuration information applies. Or, the UE 4a-05 may determine which serving cells are to apply the DRX configuration information.

[0276] The base station 4a-10 may configure an SCell and multiple DRX configuration information for the UE 4a-05 in the connected mode (step 4a-25). According to an embodiment, the configuration information may be an RRCReconfiguration message. In this case, the UE4a-05 may apply the DRX configuration information corresponding to each serving cell (step 4a-30).

[0277] The UE 4a-05 may send an RRCReconfigurationComplete as a response message to the RRCReconfiguration message to the base station 4a-10 (step 4a-35). According to an embodiment, the serving cell information (e.g., DRX group information) applying each DRX configuration information may be stored in the RRCReconfigurationComplete message.

[0278] Although not shown, according to an embodiment, when it is necessary to reconfigure the DRX configuration, the UE 4a-05 may request the base station 4a-10 to reconfigure the DRX configuration. According to an embodiment, the UE 4a-05 may request the base station 4a-10 to update the SCell list. In this case, the reconfiguration and update requests may be made through a UE assistance information message.

[0279] ​ It is a diagram illustrating a radio link monitoring (RLM) operation according to an embodiment of the present invention.

[0280] A Radio Link Failure (RLF) can be declared based on the results from the RLM. The UE physical layer can determine whether the downlink signal quality is lower than a specific threshold Qout according to the cell-specific reference signal (CRS) of the serving cell at each specific period, Qout evaluation period, and T_Evaluate_out_SSB. If the signal quality is lower than the specific threshold Qout, the physical layer sends an "out-of-sync" indicator to the higher layer. After the "out-of-sync" indicator is sent to the upper layer for the first time (4b-05), when the "out-of-sync" indicator is sent to the upper layer a specific number of times (e.g., N310), the UE drives a specific timer (e.g., T310) (4b-10). The physical layer can also determine whether the downlink signal quality is higher than a specific threshold Qin according to the CRS of the serving cell for each Qout evaluation period and T_Evaluate_in_SSB. In this case, the Qout evaluation period, T_Evaluate_out_SSB, and T_Evaluate_in_SSB can be determined according to the DRX cycle, as shown in [Table 6] and [Table 7].

[0281] [Table 6]

[0282] Table 8.1.2.2-1: Evaluation Periods TEvaluate_out_SSB and TEvaluate_in_SSB for FR1

[0283]

[0284] [Table 7]

[0285] Table 8.1.2.2-2: Evaluation Periods T Evaluate_out_SSB and T Evaluate_in_SSB

[0286]

[0287] If the signal quality is higher than the specific threshold Qin, the physical layer sends a "synchronized" indicator to the higher layer. When the "synchronized" indicator is transmitted to the upper layer a specific number of times, the UE can stop the running T310 timer. When the T310 timer does not stop but expires, the upper layer can declare an RLF (4b-15). After declaring an RLF, the UE drives another timer (e.g., T311). The UE searches for a new suitable cell, and if no new suitable cell is found before the expiration of T311, the mode of the UE is switched to the standby mode (4b-25). When a new suitable cell is found before the expiration of the T311 timer, the UE drives the T301 timer and performs the cell reconstruction process (4b-20). If the reconstruction is not successfully completed before the expiration of the T301 timer, the UE is switched to the standby mode (4b-30). If the reconstruction is successful, the UE continues to the connected mode of the cell.

[0288] RLF can be declared by the RLM operation or according to another condition. For example, even in the case of a random access failure, RLF can be declared (4b-35). In addition, even if the maximum number of retransmissions is reached in the RLC layer and the packet is not successfully sent, RLF can be declared (4b-40), and the descriptions of the operations of T301 and T311 can be the same as those shown in Table 8.

[0289] [Table 8]

[0290]

[0291] The NR mobile communication system supports beam operations in FR2. In addition, in order to determine whether the applied beam provides good signal strength for data transmission and reception, the UE performs beam failure detection operations at each predetermined time interval. For example, for each T_Evaluate_BFD_SSB time interval, the UE determines whether the downlink radio link quality meets a predetermined quality threshold in the configured SSB radio resources. In this case, the T_Evaluate_BFD_SSB time intervals are determined according to the DRX cycle. The following [Table 9] and [Table 10] show the T_Evaluate_BFD_SSB time intervals according to the DRX cycle in the TS38.133 standard document.

[0292] [Table 9]

[0293] Table 8.5.2.2-1: Evaluation period T for FR1 Evaluate_BFD_SSB

[0294]

[0295] [Table 10]

[0296] Table 8.5.2.2-2: Evaluation period T for FR2 Evaluate_BFD_SSB

[0297]

[0298] The base station can provide the UE with configuration information related to beam failure detection and RLM through RRC messages. For example, the RRC messages can be the same as those shown in [Table 11], [Table 12] and [Table 13].

[0299] [Table 11]

[0300] RadioLinkMonitoringConfig information element

[0301]

[0302] [Table 12]

[0303]

[0304] [Table 13]

[0305]

[0306]

[0307] Even in intra-frequency measurements, the time interval for measurement can be determined according to the DRX cycle. For example, as shown in the following [Table 14] to [Table 19], both the time period for primary synchronization signal (PSS) / secondary synchronization signal (SSS) detection and the time period for obtaining the index information of the measured SSB (the time period for time index detection) may be affected by the DRX cycle.

[0308] [Table 14]

[0309] Table 9.2.5.1-1: Time period for PSS / SSS detection, (frequency range FR1)

[0310]

[0311] [Table 15]

[0312] Table 9.2.5.1-2: Time period for PSS / SSS detection, (frequency range FR2)

[0313]

[0314] [Table 16]

[0315] Table 9.2.5.1-3: Time period for time index detection (frequency range FR1)

[0316]

[0317] [Table 17]

[0318] Table 9.2.5.1-4: Time period for PSS / SSS detection, deactivating SCell (frequency range FR1)

[0319] ​ <![CDATA[T PSS / SSS_sync_intra > ​ <![CDATA[5x measCycleSCell x CSSFi ntra > ​ <![CDATA[5x max(measCycleSCell, 1.5xDRX cycle)x CSSF intra <!-- 26 -->]]> ​ <![CDATA[5x max(measCycleSCell, DRX cycle)x CSSF intra >

[0320] [Table 18]

[0321] Table 9.2.5.1-5: Time period for PSS / SSS detection, deactivating SCell (frequency range FR2)

[0322]

[0323] [Table 19]

[0324] Table 9.2.5.1-6: Time Periods for Time Index Detection, Deactivating SCell (Frequency Range FR1)

[0325] ​ <![CDATA[T SSB_time_index_intra > ​ <![CDATA[3x measCycleSCell x CSSF intra > ​ <![CDATA[3x max(measCycleSCell, 1.5xDRX cycle) x CSSF intra > ​ <![CDATA[3x max(measCycleSCell, DRX cycle)x CSSF intra >

[0326] In inter-frequency measurements, the time interval for measurement can be determined according to the DRX cycle. For example, as shown in [Table 20] to [Table 23], both the time period for detecting PSS / SSS and the time period for obtaining the index information of the measured SSB (time period for time index detection) may be affected by the DRX cycle.

[0327] [Table 20]

[0328] Table 9.3.4-1: Time Periods for PSS / SSS Detection, (Frequency Range FR1)

[0329]

[0330] [Table 21]

[0331] Table 9.3.4-2: Time Periods for PSS / SSS Detection, (Frequency Range FR2)

[0332]

[0333] [Table 22]

[0334] Table 9.3.4-3: Time Periods for Time Index Detection (Frequency Range FR1)

[0335]

[0336] [Table 23]

[0337] Table 9.3.4-4: Time Periods for Time Index Detection (Frequency Range FR2)

[0338]

[0339] The base station can provide the UE with configuration information related to cell measurement and measConfig through RRC messages. For example, the measConfig included in the RRC message can be the same as that shown in [Table 24]. The following MeasObject (MO) includes the frequency information to be measured by the UE, and the following ReportConfig can store the configuration information about the events for the UE to report measurement results.

[0340] [Table 24]

[0341] MeasConfig information element

[0342]

[0343] ​ is a flowchart showing UE operations that apply multiple DRX configuration information to RLM, link recovery, and measurement operations according to embodiments of the present disclosure.

[0344] Reference ​ , at step 4c-05, the UE may report its capability information to the base station. The capability information may include information (indicator) indicating that the UE can apply multiple DRXs when multiple serving cells are configured.

[0345] In step 4c-10, the UE may receive the configuration of the SCell and multiple DRX configuration information from the base station. In this case, it may be configured which DRX configuration information will be applied to each serving cell. A serving cell belonging to FR1 may be configured to apply the first DRX configuration information, and a serving cell belonging to FR2 may be configured to apply the second DRX configuration information. Alternatively, the base station may define an indicator that indicates which DRX configuration information is applied to each serving cell configuration information for the UE. Alternatively, the UE may determine which serving cells are to apply the DRX configuration information. In addition, configuration information related to RLM, link recovery, and cell measurement may also be provided from the base station to the UE.

[0346] In step 4c-15, the UE may perform RLM, link recovery, and intra / inter / RAT measurement operations.

[0347] In step 4c-20, the UE may determine whether multiple connected DRX (C-DRX) cycles are applied. According to one embodiment, even if multiple C-DRXs are configured, one C-DRX cycle may be applied according to the base station configuration. When multiple C-DRXs are configured for the UE and when multiple C-DRX cycles are applied to the UE, the operations in the present disclosure are performed.

[0348] When multiple C-DRX cycles are applied to the UE, the UE may use the DRX cycle applied to the PCell to derive the RLM evaluation period in step 4c-25. RLM monitors the signal quality of the PCell and determines whether there is a link failure based on the result. Therefore, when multiple DRX cycles are applied to the serving cells, the UE may consider the DRX cycle applied to the PCell to perform the RLM operation.

[0349] In step 4c-30, when the UE performs a link recovery operation for each serving cell, the UE may apply the DRX cycle applied to each serving cell to derive a T_Evaluate_BFD_SSB time interval for detecting beam failure.

[0350] In step 4c-35, when the UE performs intra-frequency measurement operations for each serving cell, the UE may apply the DRX cycle applied to each serving cell to derive a time period for detecting PSS / SSS for performing intra-frequency measurements (time period for PSS / SSS detection) and a time period for obtaining index information of the measured SSB (time period for time index detection).

[0351] In step 4c-40, when the UE performs an inter-frequency measurement operation for each serving cell, the UE can select a DRX cycle for deriving a time period for PSS / SSS detection for performing inter-frequency measurement and a time period for obtaining measurement index information of the SSB (time period for time index detection) by applying one of the following options.

[0352] Option 1: The base station can indicate to the UE the DRX cycle to be applied when measuring the frequency indicated by the MeasObject in the MeasObject IE in the MeasConfig IE (information element). To this end, the base station can introduce a new field in the MeasObject IE. This field can be used to indicate whether the DRX cycle is the first or second cycle of the two applied DRX cycles, or to configure the longer or shorter cycle of the two applied DRX cycles.

[0353] - Option 2: For inter-frequency measurement, the DRX cycle applied to the PCell (or SPcell) may always be applied.

[0354] - Option 3: For inter-frequency measurements, the shorter of the two applied DRX cycles can always be applied. This is beneficial for maximizing measurement performance.

[0355] Steps 4c-25 to 4c-40 are not performed in the order described, but specific steps thereof may be performed first, later, or simultaneously.

[0356] In step 4c-45, the UE may apply an applied DRX cycle to derive time period information necessary for RLM, link recovery, and measurement operations.

[0357] As with ​ As described in the relevant section, the UE can send reporting preference information to the base station. In particular, in the NR mobile communication system, compared with LTE, the UE can report preferred reconfiguration items for reducing heat to the base station in more detail.

[0358] ​ It is a message flow chart showing the process in which a UE reports predetermined information to a base station in a mobile communication system to mitigate overheating of the UE according to an embodiment of the present disclosure.

[0359] UE 5a-05 may overheat during the data transmission and reception process. Therefore, in order to mitigate the heat of UE 5a-05, it may be necessary to reconfigure the RRC connection from the base station 5a-10. For this purpose, in a mobile communication system, a method is introduced in which UE 5a-05 reports predetermined information to base station 5a-10 to mitigate UE overheating. The predetermined information reported by UE 5a-05 to base station 5a-10 is the reconfiguration information preferred by UE 5a-05 to suppress overheating of UE 5a-05.

[0360] Reference ​ , UE 5a-05 reports to base station 5a-10 that it has the ability to report predetermined information (5a-15). Base station 5a-10 configures UE 5a-05 through overheatingAssistanceConfig, which is a predetermined IE, to be able to report predetermined information to base station 5a-10. overheatingAssistanceConfig includes a value of a prohibit timer (overheatingIndicationProhibitTimer). When UE 5a-05 recognizes overheating (5a-25) and reports predetermined information to base station 5a-10 (5a-30), the prohibit timer is driven (5a-35), and UE 5a-05 cannot report predetermined information to base station 5a-10 again while the timer is running. This is to prevent excessive signaling overhead caused by frequent triggering of the reporting of predetermined information. The predetermined information is stored in the overheatingAssistance IE and is sent to base station 5a-10 through the UEAssistanceInformation message, which is an RRC message. The overheatingAssistance IE in the TS38.331 standard file may be the same as that shown in [Table 25].

[0361] [Table 25]

[0362]

[0363] In order to prevent overheating through the overheatingAssistance IE, UE 5a-05 may report its own preferred reconfiguration information to base station 5a-10.

[0364] reducedMaxCC indicates the maximum number of SCell preferred by UE 5a-05. It indicates the maximum number of SCell preferred by UE 5a-05 for each of the uplink and downlink.

[0365] reducedMaxBW-FR1 and reducedMaxBW-FR2 respectively indicate the maximum frequency bandwidth preferred by UE 5a-05 in frequency range 1 (FR1) and frequency range 2 (FR2). It indicates the maximum frequency bandwidth preferred by UE 5a-05 for each of the uplink and downlink. FR is the frequency range defined by the NR standard. FR1 represents the lower frequency range based on a specific frequency, and FR2 represents the higher frequency range. reducedMaxBW-FR2 can indicate 0 MHz, which means a request for the release of FR2. In reducedMaxBW-FR1, 0 MHz cannot be indicated.

[0366] reducedMaxMIMO-LayersFR1 and reducedMaxMIMO-LayersFR2 respectively indicate the maximum number of MIMO layers preferred by UE 5a-05 in FR1 and FR2. In FR1 and FR2, it indicates the maximum number of MIMO layers preferred by the UE for each of the uplink and downlink.

[0367] When receiving the overheatingAssistance IE, the base station 5a-10 may perform RRC connection reconfiguration (5a-40) based on the reconfiguration information recommended by UE 5a-05. In this case, it is determined by the implementation of the base station 5a-10 whether to perform the actual reconfiguration and the parameter configuration values of the reconfiguration.

[0368] The reconfiguration information (5a-45) is provided from the base station 5a-10 to the UE 5a-05 through RRCReconfiguration, which is an RRC message.

[0369] ​ It is a message flow diagram showing the process in which a UE reports predetermined information to a base station in a mobile communication system to mitigate the UE delay phenomenon according to an embodiment of the present disclosure.

[0370] UE 5b-05 may experience delays during the data transmission and reception process. For delay-sensitive services, such as VoLTE services, predetermined delay requirements should be met. Therefore, in order to meet the preferred delay time, UE 5b-05 may report the DRX cycle information preferred by itself to the base station 5b-10.

[0371] Reference ​, UE 5b-05 reports to the base station 5b-10 that it has the ability to report predefined information (5b-15). The base station 5b-10 configures UE 5b-05 via delayBudgetReportingConfig to be able to report predefined information to the base station 5b-10. delayBudgetReportingConfig is a predefined IE to UE 5b-05. The DelayBudgetReportingConfigIE includes the value of a prohibit timer and DelayBudgetReportingProhibitTimer. When UE 5b-05 identifies an unsatisfactory delay phenomenon (5b-25) and when reporting predefined information (5b-30), the prohibit timer is started (5b-35), and UE 5b-05 cannot report predefined information to the base station 5b-10 again while the timer is running. This is to prevent excessive signaling overhead caused by frequent triggering of the reporting of predefined information. The predefined information is stored in the delayBudgetReport IE and is sent to the base station 5b-10 via the UEAssistanceInformation message which is an RRC message. In the TS38.331 standard document, the DelayBudgetReport IE can be the same as [Table 26].

[0372] [Table 26]

[0373]

[0374] In order to maintain an appropriate delay time via the DelayBudgetReportingConfig IE, UE 5b-05 can report its preferred DRX cycle information to the base station 5b-10. The Type1 field indicates the preferred DRX cycle information of UE 5b-05, and its unit is msec. For example, ms40 means 40 msec, and msMinus40 means -40 msec.

[0375] Upon receiving the DelayBudgetReportingConfig IE, the base station 5b-10 can perform RRC connection reconfiguration (5b-40) based on the reconfiguration information proposed by UE 5b-05. In this case, it is determined by the implementation of the base station 5b-10 whether to perform the actual reconfiguration and the parameter configuration values of the reconfiguration.

[0376] The reconfiguration information is provided from the base station 5b-10 to UE 5b-05 via RRCReconfiguration which is an RRC message (5b-45).

[0377] The present disclosure describes a process of reporting UE assistance information in a dual connectivity (DC) scenario. In particular, the process is different according to the type of the first or second UE preference. In the present disclosure, the first UE preference refers to overheating assistance information, and the second UE preference refers to delay budget, BW preference, SPS preference, etc. other than overheating assistance information.

[0378] Dual connectivity is a technology in which a UE is connected to two or more base stations to receive services. In this case, the two base stations connected to the UE can communicate with each other and provide services to the UE within the scope not exceeding the capabilities of the UE through separate schedulers. The base station to which the PCell belongs is called the master node (MN), and the base station to which the PCell does not belong is called the secondary node (SN). According to the RAT to which the base station belongs, there are several types of dual connectivity. For example, the dual connectivity between NR base stations is NR DC, the dual connectivity between an LTE base station (PCell) - NR base station is EN-DC, and the dual connectivity between an NR base station (PCell) - LTE base station is NE-DC.

[0379] ​ It is a message flow diagram showing a process of reporting predetermined information of the first UE preference to a base station in a DC scenario according to an embodiment of the present disclosure.

[0380] UE 5c-05 reports its capability information to MN 5c-10. The capability information includes information about the capability of reporting the first UE overheating assistance information and information about the supported DC scenario (5c-20).

[0381] MN 5c-10 configures DC for UE 5c-05 through coordination with SN 5c-15 (5c-25). During the coordination process, MN 5c-10 sends the capability information of UE 5c-05 to SN 5c-15 through a predetermined inter-node message (CG-ConfigInfo) (5c-30).

[0382] According to EN-DC, NR-DC, and NE-DC, UE 5c-05 reports the first overheating assistance information to the base station (MN or SN) according to a predetermined condition.

[0383] When EN-DC is configured, MN 5c-10 configures UE 5c-05 via a predefined RRC message to be able to report first overheating assistance information if necessary (5c-35). UE 5c-05 triggers the operation of reporting the first preference. For example, UE 5c-05 can determine according to the implementation of the UE to report the first preference when the UE is overheated beyond a predefined threshold. In this case, in order to reduce heat generation, UE 5c-05 can report to the base station the number of preferred maximum SCell, the aggregated BW, and the number of maximum MIMO layers. UE 5c-05 determines whether SRB3 is configured (5c-40). If EN-DC is currently configured and SRB3 is configured, then UE5c-05 stores the first overheating assistance information in the predefined RRC message and UEAssistanceInformation, and sends it to SN 5c-15 (5c-45).

[0384] If EN-DC is currently configured and SRB3 is not configured, then UE 5c-05 stores the first overheating assistance information in the predefined RRC message and UE InformationTransferMRDC, and sends it to MN 5c-10 (5c-50). Upon receiving the first overheating assistance information, MN 5c-10 stores the first overheating assistance information in the predefined inter-node message (CG-ConfigInfo), and forwards it to SN 5c-15 (5c-55). Upon receiving the first overheating assistance information, SN 5c-15 triggers RRC connection reconfiguration based on the first overheating assistance information.

[0385] When NR-DC is configured, SN 5c-15 can configure that the first overheating assistance information can be reported to itself (i.e., SN 5c-15) if necessary for UE 5c-05.

[0386] If SRB3 is not configured, then SN 5c-15 sends to MN 5c-10 via a predefined inter-node message (CG-CoFIG) the information that the first overheating assistance information can be reported to SN 5c-15 if necessary (5c-60). MN 5c-10 that has received the configuration information stores the information that the first overheating assistance information can be reported to SN 5c-15 if necessary, and sends it to UE 5c-05 in the predefined RRC message and RRCConnectionReconfiguration (5c-65).

[0387] UE 5c-05 triggers the operation of reporting the first preference. UE 5c-05 stores the first overheating assistance information in a predetermined RRC message and UE InformationTransferMRDC, and sends it to MN 5c-10 (5c-70). Upon receiving the first overheating assistance information, MN 5c-10 stores the first overheating assistance information in a predetermined inter-node message (CG-ConfigInfo), and forwards it to SN 5c-15 (5c-75).

[0388] If SRB3 is configured, SN 5c-15 directly sends the first overheating assistance information to UE 5c-05 through a predetermined RRC message and RRCReconfiguration via a predetermined inter-node message (CG-Config) if necessary the first overheating assistance information can be reported to itself (i.e., SN 5c-15) (5c-80). UE 5c-05 triggers the operation of reporting the first preference. UE 5c-05 stores the first overheating assistance information in a predetermined RRC message and UE Assistance Information, and sends it to SN 5c-15 (5c-85).

[0389] In the case of NE-DC or SA (standalone), MN 5c-10 configures UE 5c-05 through a predetermined RRC message and RRCReconfiguration to report the first overheating assistance information if needed (5c-90). UE 5c-05 triggers the operation of reporting the first preference. UE 5c-05 stores the first overheating assistance information in a predetermined RRC message and UE Assistance Information, and sends it to MN 5c-10 (5c-95).

[0390] ​ It is a message flow diagram showing the process of reporting predetermined information of the second UE preference to a base station in a DC scenario according to an embodiment of the present disclosure.

[0391] UE 5d-05 reports its capability information to MN 5d-10. The capability information includes information about the capability of reporting the second UE preference (e.g., latency budget, BW preference, SPS preference, etc.) and information about the supported DC scenarios (5d-20).

[0392] MN 5d-10 configures DC for UE 5d-05 through coordination with SN 5d-15 (5d-25). During the coordination process, MN 5d-10 sends the capability information of UE 5d-05 to SN 5d-15 through a predetermined inter-node message (CG-ConfigInfo) (5d-30).

[0393] SN 5d-15 may be configured such that the second assistance information can be reported to itself (i.e., SN 5d-15), if necessary for UE 5d-05.

[0394] If SRB3 is not configured, SN 5d-15 sends, via a predefined inter-node message (CG-Config) (5d-35) to MN 5d-10, information that the second assistance information can be reported to SN 5d-15. Upon receiving the information that the second assistance information can be reported to SN 5d-15 if necessary, MN 5d-10 stores the information that the second assistance information can be reported to SN 5d-15 in a predefined RRC message and RRCReconfiguration (or RRCConnectionReconfiguration), and sends it to UE 5d-05 (5d-40).

[0395] UE 5d-05 triggers an operation to report the second preference. UE 5d-05 stores the second assistance information in a predefined RRC message and UE InformationTransferMRDC, and sends it to MN 5d-10 (5d-45). Upon receiving the second assistance information, MN 5d-10 stores the second assistance information in a predefined inter-node message (CG-ConfigInfo), and forwards the message to SN 5d-15 (5d-50).

[0396] If SRB3 is configured, SN 5d-15 directly sends, via a predefined RRC message and RRCReconfiguration, via a predefined inter-node message (CG-Config), to UE 5d-05, that the second assistance information can be reported to itself (i.e., SN 5d-15), if necessary, (5d-55). UE 5d-05 triggers an operation to report the second preference. UE 5d-05 stores the second assistance information in a predefined RRC message and UE AssistanceInformation, and sends it to SN 5d-15 (5d-60).

[0397] ​ is a flowchart showing the operations of a UE according to an embodiment of the present disclosure.

[0398] In step 5e-05, the UE receives, from a base station (MN or SN), an otherConfig IE configured to enable reporting of UE preferences (first UE preference or second UE preference).

[0399] In step 5e-10, the UE triggers an operation to report UE preferences.

[0400] In step 5e-15, the UE determines the type of the currently configured dual connectivity (DC).

[0401] In step 5e-20, if the configured DC is (NG) EN-DC, the UE determines whether SRB3 has been configured.

[0402] In step 5e-25, if SRB3 has been configured, the UE sends UEAssistanceInformation containing UE assistance information to the SN via SRB3.

[0403] In step 5e-30, if SRB3 has not been configured, the UE sends ULInformationTransferMRDC containing UE assistance information to the MN.

[0404] In step 5e-35, if the configured DC is NR-DC, the UE determines whether to store the otherConfig IE received via SRB1 or received via SRB3 in mrdc-SecondyCellGroupConfig.

[0405] In step 5e-40, if the otherConfig IE received via SRB1 or received via SRB3 is stored in mrdc-SecondyCellGroupConfig, the UE determines whether SRB3 has been configured.

[0406] In step 5e-45, if SRB3 has been configured, the UE sends UEAssistanceInformation containing UE assistance information to the SN via SRB3.

[0407] In step 5e-50, if SRB3 has not been configured, the UE sends ULInformationTransferMRDC containing UE assistance information to the MN.

[0408] In step 5e-55, if the otherConfig IE received via SRB1 or received via SRB3 is not stored in mrdc-SecondyCellGroupConfig, the UE sends UEAssistanceInformation containing UE assistance information to the MN via SRB1.

[0409] ​ It is a flowchart showing the operations of a base station according to an embodiment of the present disclosure.

[0410] In step 5f-05, the base station receives UE capability information from the UE.

[0411] In step 5f-10, the base station sends an otherConfig IE including an overheatingAssistanceConfig IE and a powerPreferenceAssistanceConfig IE to the UE.

[0412] In step 5f-15, the base station receives a UEAssistanceInformation message from the UE. The UEAssistanceInformation message may include an overheatingAssistance IE or a powerPreferenceAssistance IE.

[0413] In step 5f-20, the base station configures configuration parameters based on the UEAssistanceInformation message received from the UE.

[0414] In step 5f-25, the base station stores the configuration information (i.e., the configuration parameters) in an RRCReconfiguration message and sends the message to the UE.

[0415] ​ is a block diagram illustrating the internal structure of a UE according to an embodiment of the present invention.

[0416] Reference ​ , the UE includes a radio frequency (RF) processor 610, a baseband processor 620, a storage unit 630, and a controller 640.

[0417] The RF processor 610 performs functions for transmitting and receiving signals through a wireless channel, such as frequency band conversion and amplification of signals. That is, the RF processor 610 upconverts a baseband signal provided by the baseband processor 620 into an RF band signal, transmits the RF band signal through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the RF processor 610 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. In FIG. 11, only one antenna is shown, but the UE may include multiple antennas. In addition, the RF processor 610 may include multiple RF chains. In addition, the RF processor 610 may perform beamforming. For beamforming, the RF processor 610 may adjust the phase and amplitude of each signal transmitted and received through multiple antennas or antenna elements. In addition, the RF processor may perform MIMO and receive multiple layers when performing MIMO operations.

[0418] The baseband processor 620 performs functions of converting baseband signals and bit strings according to the physical layer standard of the system. For example, when transmitting data, the baseband processor 620 generates complex symbols by encoding and modulating the transmitted bit string. In addition, when receiving data, the baseband processor 620 recovers the received bit string by demodulating and decoding the baseband signal provided by the RF processor 610. For example, in the case of following the orthogonal frequency division multiplexing (OFDM) scheme, when transmitting data, the baseband processor 620 generates complex symbols by encoding and modulating the transmitted bit string, maps the complex symbols to subcarriers, and then configures OFDM symbols by inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processor 620 divides the baseband signal provided by the RF processor 610 into OFDM symbol units, recovers the signal mapped to subcarriers by fast Fourier transform (FFT) operation, and then recovers the received bit string by demodulating and decoding.

[0419] As described above, the baseband processor 620 and the RF processor 610 transmit and receive signals. Therefore, the baseband processor 620 and the RF processor 610 can be referred to as a transmitter, a receiver, a transceiver, or a communication unit. In addition, to support multiple different radio access technologies, at least one of the baseband processor 620 and the RF processor 610 may include multiple communication modules. In addition, to process signals in different frequency bands, at least one of the baseband processor 620 and the RF processor 610 may include different communication modules. For example, different radio access technologies may include wireless LAN (e.g., IEEE 802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include super high frequency (SHF) (e.g., 2.NRHz, NRHz) bands and millimeter wave (e.g., 60 GHz) bands.

[0420] The storage unit 630 stores data such as basic programs, application programs, and configuration information for the operation of the UE. In particular, the storage unit 630 may store information related to a second access node that performs wireless communication using a second radio access technology. In addition, the storage unit 630 provides the stored data according to a request from the controller 640.

[0421] The controller 640 controls all operations of the UE to perform operations according to the embodiments described in the relevant part related to ​ For example, the controller 640 transmits and receives signals through the baseband processor 640 and the RF processor 610. In addition, the controller 640 writes and reads data in the storage unit 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 controls communication and an application processor (AP) that controls the upper layer (e.g., application programs).

[0422] ​ is a block diagram illustrating the configuration of a base station according to an embodiment of the present invention.

[0423] As ​ shown, the base station includes an RF processor 710, a baseband processor 720, a backhaul communication unit 730, a storage unit 740, and a controller 750.

[0424] The RF processor 710 performs functions for transmitting and receiving signals through a wireless channel, such as frequency band conversion and amplification of signals. That is, the RF processor 710 upconverts the baseband signal provided from the baseband processor 720 to an RF band signal, transmits the baseband signal through an antenna, and downconverts the RF band signal received through the antenna to a baseband signal. For example, the RF processor 710 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in the figure, the first access node may include multiple antennas. In addition, the RF processor 710 may include multiple RF chains. In addition, the RF processor 710 may perform beamforming. For beamforming, the RF processor 710 may adjust the phase and amplitude of each signal transmitted and received through multiple antennas or antenna elements. By transmitting one or more layers, the RF processor 710 may perform downlink MIMO operations.

[0425] The baseband processor 720 performs functions of converting a baseband signal and a bit string according to the physical layer standard of the first radio access technology. For example, when transmitting data, by encoding and modulating the transmitted bit string, the baseband processor 720 generates complex symbols. In addition, when receiving data, by demodulating and decoding the baseband signal provided from the RF processor 710, the baseband processor 720 recovers the received bit string. For example, in the case of following the OFDM scheme, when transmitting data, by encoding and modulating the transmitted bit string, the baseband processor 720 generates complex symbols, maps the complex symbols to subcarriers, and configures OFDM symbols through IFFT operations and CP insertion. In addition, when receiving data, the baseband processor 720 divides the baseband signal provided from the RF processor 710 into OFDM symbol units, recovers the signal mapped to the subcarriers through FFT operations, and then recovers the received bit string through demodulation and decoding. As described above, the baseband processor 720 and the RF processor 710 transmit and receive signals. Therefore, the baseband processor 720 and the RF processor 710 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or an RF unit.

[0426] The backhaul communication unit 730 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 730 converts a bit string sent from the master base station to another node (e.g., a secondary base station, a core network, etc.) into a physical signal, and converts a physical signal received from another node into a bit string.

[0427] The storage unit 740 stores data such as a basic program, an application program, and configuration information for the operation of the master base station. In particular, the storage unit 740 may store information about the bearers allocated to the access UEs, the measurement results reported from the access UEs, etc. In addition, the storage unit 740 may store information used as a criterion for determining whether to provide or stop dual connectivity with the UEs. In addition, the storage unit 740 provides the stored data according to the request of the controller 750.

[0428] The controller 750 controls all operations of the base station so as to perform the operations according to the embodiments described in the relevant part related to ​ For example, the controller 750 transmits and receives signals through the baseband processor 720 and the RF processor 710 or through the backhaul communication unit 730. In addition, the controller 750 writes and reads data in the storage unit 740. To this end, the controller 750 may include at least one processor.

[0429] The method according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0430] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors in the electronic device. The one or more programs include instructions for causing the electronic device to perform the method according to the embodiments described in the claims or the specification of the present disclosure.

[0431] Such a program (software module, software) may be stored in a random access memory, a non-volatile memory (including flash memory, read-only memory (ROM), electrically erasable programmable ROM (EEPROM), magnetic disk storage devices, compact disc ROM (CD-ROM), digital versatile disc (DVD), any other form of optical storage device, or cassette tape). Alternatively, the program may be stored in a memory configured with some or all of the combinations thereof. In addition, a plurality of individual configured memories may be included.

[0432] In addition, the program can be stored in a connectable 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 (WAN), or a storage area network (SAN), or a communication network configured using a combination thereof. Such a storage device can access a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network can access a device implementing an embodiment of the present disclosure.

[0433] In the specific embodiments of the present disclosure described above, according to the presented specific embodiments, the elements included in the present disclosure are represented in the singular or plural. However, the singular or plural expressions are appropriately selected for convenience of description, and the present invention is not limited to singular or plural elements, and even if components are represented in the plural, they can be configured as singular, or even if components are represented in the singular, they can be configured as plural.

[0434] In the detailed description of the present disclosure, although specific embodiments have been described, various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be defined by the following claims and equivalents of the claims.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising: Receiving, from a first base station, a radio resource control RRC message including auxiliary configuration information, the auxiliary configuration information including a timer for prohibiting reporting of first auxiliary information; Detecting internal overheating; And Based on the detection, sending, via the first base station, second auxiliary information for a secondary cell group SCG to a second base station, Wherein the timer is applied to prohibit reporting of the second auxiliary information for the SCG, Wherein the auxiliary configuration information indicates sending at least one of: the first auxiliary information based on detection of internal overheating of the UE or the second auxiliary information based on detection of internal overheating of the SCG of the UE.

2. The method according to claim 1, Among them, The first auxiliary information includes first UE preference information related to the UE category or second UE preference information related to the maximum number of secondary cells SCell, and Wherein, when the timer is running, the first auxiliary information is not sent to the first base station.

3. The method according to claim 1, wherein, The second auxiliary information includes at least one of the following information: third UE preference information related to the maximum number of SCell, fourth UE preference information related to the maximum frequency bandwidth within frequency range 1 FR1, fifth UE preference information related to the maximum frequency bandwidth within frequency range 2 FR2, sixth UE preference information related to the maximum number of multiple-input multiple-output MIMO layers within the FR1, or seventh UE preference information related to the maximum number of MIMO layers within the FR2.

4. The method according to claim 1, wherein, The first base station is a Long Term Evolution LTE base station, and the second base station is a New Radio NR base station, and Wherein the UE is in Evolved Universal Terrestrial Radio Access E-UTRA-NR dual connectivity EN-DC through the first base station and the second base station.

5. A method performed by a first base station in a wireless communication system, the method comprising: Sending, to a user equipment UE, a radio resource control RRC message including auxiliary configuration information, the auxiliary configuration information including a timer for prohibiting reporting of first auxiliary information; Receiving, from the UE, second auxiliary information for a second cell group SCG; And Sending, to a second base station, the second auxiliary information for the SCG, Wherein the timer is applied to prohibit reporting of the second auxiliary information, and Wherein the auxiliary configuration information indicates receiving at least one of: the first auxiliary information based on detection of internal overheating of the UE or the second auxiliary information based on the internal overheating of the SCG of the UE.

6. The method according to claim 5, wherein The first auxiliary information includes at least one of: first UE preference information related to the UE category or second UE preference information related to the maximum number of secondary cells SCell, and Wherein, when the timer is running, the first auxiliary information is not sent to the first base station.

7. The method according to claim 5, wherein, The second auxiliary information includes at least one of the following information: third UE preference information related to the maximum number of SCell, fourth UE preference information related to the maximum frequency bandwidth within frequency range 1 (FR1), fifth UE preference information related to the maximum frequency bandwidth within frequency range 2 (FR2), sixth UE preference information related to the maximum multiple-input multiple-output (MIMO) layer number within the FR1, or seventh UE preference information related to the maximum MIMO layer number within the FR2, and wherein, the first base station is a Long-Term Evolution (LTE) base station, and the second base station is a New Radio (NR) base station.

8. A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver; and a controller configured to: receive, via the transceiver, a radio resource control (RRC) message including auxiliary configuration information from a first base station, the auxiliary configuration information including a timer for prohibiting reporting of first auxiliary information; detect internal overheating; and send, based on the detection, second auxiliary information for a secondary cell group (SCG) to a second base station via the first base station, wherein, the timer is applied to prohibit reporting of the second auxiliary information for the SCG, and wherein, the auxiliary configuration information indicates sending at least one of: the first auxiliary information based on detection of the UE's internal overheating or the second auxiliary information based on detection of the UE's internal overheating of the SCG.

9. The UE according to claim 8, wherein, The first auxiliary information includes at least one of the following: first UE preference information related to UE category or second UE preference information related to the maximum number of secondary cells (SCell), and wherein, when the timer is running, the first auxiliary information is not sent to the first base station.

10. The UE according to claim 8, wherein, The second auxiliary information includes at least one of the following information: third UE preference information related to the maximum number of SCell, fourth UE preference information related to the maximum frequency bandwidth within frequency range 1 (FR1), fifth UE preference information related to the maximum frequency bandwidth within frequency range 2 (FR2), sixth UE preference information related to the maximum multiple-input multiple-output (MIMO) layer number within the FR1, or seventh UE preference information related to the maximum MIMO layer number within the FR2.

11. The UE according to claim 8, wherein, The first base station is a Long-Term Evolution (LTE) base station, and the second base station is a New Radio (NR) base station, and wherein, the UE is in Evolved Universal Terrestrial Radio Access (E-UTRA)-NR dual connectivity (EN-DC) via the first base station and the second base station.

12. A first base station in a wireless communication system, the first base station comprising: a transceiver; and a controller configured to: send a radio resource control (RRC) message including auxiliary configuration information to a user equipment (UE), the auxiliary configuration information including a timer for prohibiting reporting of first auxiliary information; receive second auxiliary information for a secondary cell group (SCG) from the UE, and send the second auxiliary information for the SCG to a second base station, wherein, the timer is applied to prohibit reporting of the second auxiliary information, and Wherein, the auxiliary configuration information indicates receiving at least one of the following: the first auxiliary information based on the detection of internal overheating of the UE or the second auxiliary information based on the detection of internal overheating of the SCG of the UE.

13. The first base station according to claim 12, wherein, The first auxiliary information includes at least one of the following: the first UE preference information related to the UE category or the second UE preference information related to the maximum number of secondary cells (SCells), and Wherein, when the timer is running, the first auxiliary information is not sent to the first base station.

14. The first base station according to claim 12, wherein, The second auxiliary information includes at least one of the following information: the third UE preference information related to the maximum number of SCells, the fourth UE preference information related to the maximum frequency bandwidth within frequency range 1 (FR1), the fifth UE preference information related to the maximum frequency bandwidth within frequency range 2 (FR2), the sixth UE preference information related to the maximum multiple-input multiple-output (MIMO) layer number within the FR1, or the seventh UE preference information related to the maximum MIMO layer number within the FR2, and Wherein, the first base station is a Long-Term Evolution (LTE) base station, and the second base station is a New Radio (NR) base station.

15. A method performed by a second base station in a wireless communication system, the method comprising: Receiving, from a first base station, second auxiliary information for a secondary cell group (SCG), Wherein, a timer for prohibiting the first auxiliary information from being reported to the first base station is applied to prohibit the reporting of the second auxiliary information, and Wherein, the first auxiliary information is associated with the detection of internal overheating of a user equipment (UE), and the second auxiliary information is associated with the detection of internal overheating of the SCG.

16. The method according to claim 15, wherein, The first auxiliary information includes at least one of the first UE preference information related to the UE category or the second UE preference information related to the maximum number of secondary cells (SCells).

17. The method according to claim 15, wherein The second auxiliary information includes at least one of the following information: the third UE preference information related to the maximum number of SCells, the fourth UE preference information related to the maximum frequency bandwidth within frequency range 1 (FR1), the fifth UE preference information related to the maximum frequency bandwidth within frequency range 2 (FR2), the sixth UE preference information related to the maximum multiple-input multiple-output (MIMO) layer number within the FR1, or the seventh UE preference information related to the maximum MIMO layer number within the FR2, and Wherein, the first base station is a Long-Term Evolution (LTE) base station, and the second base station is a New Radio (NR) base station.

18. A second base station of a wireless communication system, the second base station comprising: A transceiver; And A controller configured to: Receive, from a first base station, second auxiliary information for a secondary cell group (SCG), Wherein, a timer for prohibiting the first auxiliary information from being reported to the first base station is applied to prohibit the reporting of the second auxiliary information, and Wherein, the first auxiliary information is associated with the detection of internal overheating of a user equipment (UE), and the second auxiliary information is associated with the detection of internal overheating of the SCG.

19. The second base station according to claim 18, wherein, The first auxiliary information includes at least one of first UE preference information related to the UE category or second UE preference information related to the maximum number of secondary cells (SCells), and wherein, when the timer is running, the first auxiliary information is not sent to the first base station.

20. The second base station according to claim 18, wherein, The second auxiliary information includes at least one of the following information: third UE preference information related to the maximum number of SCells, fourth UE preference information related to the maximum frequency bandwidth within frequency range 1 (FR1), fifth UE preference information related to the maximum frequency bandwidth within frequency range 2 (FR2), sixth UE preference information related to the maximum multiple-input multiple-output (MIMO) layer number within the FR1, or seventh UE preference information related to the maximum MIMO layer number within the FR2, and wherein, the first base station is a Long-Term Evolution (LTE) base station, and the second base station is a New Radio (NR) base station.

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