Measurement reporting method and apparatus for path switching in wireless communication system

Abstract

The present disclosure relates to a 5th-Generation (5G) or 6th-Generation (6G) communication system for supporting higher data transmission rates. A method performed by a base station (BS) in a wireless communication system is provided. The method includes transmitting a radio resource control (RRC) message including measurement configuration information to a relay user equipment (UE) through a direct path or via an indirect path of the UE, and receiving a Measurement Report message including a measurement result from the UE through the direct path or via the indirect path of the relay UE. Further, the measurements include a first measurement of a directional communication (PC5) link and a second measurement of a Uu link.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system (or mobile communication system). More specifically, the present disclosure relates to an enhanced measurement reporting method and apparatus for path switching in a wireless communication system. Background Art

[0002] The fifth generation (5G) mobile communication technology defines a wide frequency band so that high transmission rates and new services are possible, and can be realized not only in "6 gigahertz (GHz) below" frequency bands such as 3.5 GHz, but also in "6 GHz above" frequency bands called millimeter waves (mmWave) including 28 GHz and 39 GHz. In addition, the implementation of the sixth generation (6G) mobile communication technology (called a super 5G system) in the terahertz (THz) frequency band (e.g., 95 GHz to 3 THz frequency band) has been considered to achieve a transmission rate fifty times faster than that of the 5G mobile communication technology and an ultra-low latency of one tenth of that of the 5G mobile communication technology.

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

[0004] Currently, discussions are underway regarding improvements and performance enhancements to initial 5G mobile communication technologies in consideration of the services they support, and there is already physical layer standardization regarding technologies such as vehicle-to-everything (V2X) for assisting autonomous vehicles in making driving decisions based on information about the location and status of a vehicle sent by the vehicle and for enhancing user convenience, new radio unlicensed (NR-U) for system operations designed to comply with various regulatory requirements in unlicensed bands, NR UE power saving, a non-terrestrial network (NTN) as UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable, and positioning.

[0005] In addition, the air interface architecture / protocols of technologies have been standardized, such as the Industrial Internet of Things (IIoT) for supporting new services through interworking and integration with other industries, Integrated Access and Backhaul (IAB) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner, mobility enhancements including conditional handover and dual active protocol stack (DAPS) handover, and two-step random access (NR's two-step RACH) for simplifying the random access process. Standardization is also being conducted on the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined networking (SDN) technologies, and the system architecture / services for mobile edge computing (MEC) for receiving services based on UE location.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of networked devices will be connected to the communication network, and accordingly it is expected that enhanced functionality and performance of the 5G mobile communication systems and integrated operations of the networked devices will be necessary. To this end, new research is planned related to: effective support for extended reality (XR) such as augmented reality (AR), virtual reality (VR), and mixed reality (MR), 5G performance improvement and complexity reduction by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, metaverse service support, and drone communication.

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

[0008] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0009] Technical issues

[0010] The present disclosure provides a method and apparatus for sending a measurement report message for path switching in a wireless communication system, so as to effectively provide a path switching process between different base stations.

[0011] The technical subject matter pursued in the present disclosure may not be limited to the above-mentioned technical subject matter, and other technical subject matter not mentioned may be clearly understood by those skilled in the art to which the present disclosure belongs through the following description.

[0012] Solution to the problem

[0013] Embodiments of the present disclosure relate to a method performed by a base station (BS) in a wireless communication system. The method includes sending a radio resource control (RRC) message including measurement configuration information to a user equipment (UE) through a direct path or an indirect path via a relay UE, and receiving a measurement report (MeasurementReport) message including a measurement result from the UE through a direct path or an indirect path via a relay UE. In addition, the measurement result includes a first measurement result of a directional communication (PC5) link and a second measurement result of a Uu link.

[0014] Advantageous Effects of the Invention

[0015] The present invention provides an enhanced measurement reporting method and device for path switching in a wireless communication system.

[0016] Advantageous effects obtainable from the present disclosure may not be limited to the above-mentioned effects, and other effects that are not mentioned may be clearly understood by those skilled in the art to which the present disclosure pertains through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0018] Figure 1 A user equipment (UE) to network relay in a wireless communication system according to an embodiment of the present disclosure is shown;

[0019] Figure 2 A configuration for sending or receiving a discovery message from a UE to a network relay in a wireless communication system according to an embodiment of the present disclosure is shown;

[0020] Figure 3 It shows the configuration of the direct path and the indirect path from the UE to the network relay according to an embodiment of the present disclosure;

[0021] Figure 4A It is shown that a base station configures measurement configuration regarding a UE to network (U2N) remote UE and receives a measurement report according to an embodiment of the present disclosure;

[0022] Figure 4B The additional information in the measurement report according to the embodiment of the present disclosure is shown and the additional information is sent;

[0023] Figure 4C The operation of measurement reporting by a Layer 2 (L2) U2N remote UE according to an embodiment of the present disclosure is shown;

[0024] Figure 5A shows a UE to base station inter-path switching in a network relay according to an embodiment of the present disclosure;

[0025] Figure 5B shows a UE to base station inter-path switching in a network relay according to an embodiment of the present disclosure;

[0026] Figure 6 is a diagram showing a structure of a base station according to an embodiment of the present disclosure; and

[0027] Figure 7 is a diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0028] Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0030] When describing the embodiments of the present disclosure, descriptions related to technical contents that are well known in the art and not directly related to the present disclosure will be omitted. Such unnecessary omission of descriptions is intended to prevent the main idea of ​​the present disclosure from being obscured and to convey the main idea more clearly.

[0031] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements are provided with the same reference numerals.

[0032] By referring to the embodiments described below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will be clear. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals designate the same or similar elements. In addition, when describing the present disclosure, when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear, the detailed description of the known functions or configurations incorporated herein will be omitted. The terms to be described below are terms based on the functional definitions in the present disclosure, and may be different according to the user, the user's intention or custom. Therefore, the definition of the terms should be based on the content in the entire specification.

[0033] The following description of the embodiments of the present disclosure is mainly directed to a new radio (NR) as a radio access network and a packet core 5G system or a 5G core network or a next generation core (NG core) as a core network in the 5G mobile communication standard specified by the Third Generation Partnership Project (3GPP) as a mobile communication standardization group, but based on the determination of those skilled in the art, the main ideas of the present disclosure can be applied to other communication systems with similar backgrounds with some modifications without significantly departing from the scope of the present disclosure.

[0034] In the following description, for the convenience of description, some terms and names defined in the 3GPP standard (a standard for 5G, NR, LTE or similar systems) may be used. However, the present disclosure is not limited to these terms and names and can be applied to systems conforming to other standards in the same manner.

[0035] In the following description, for the convenience of description, terms for identifying access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms referring to subjects with equivalent technical meanings may be used.

[0036] In the following description, a base station is an entity that allocates resources to a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a "downlink (DL)" refers to a radio link via which a base station sends a signal to a terminal, and an "uplink (UL)" refers to a radio link via which a terminal sends a signal to a base station.

[0037] In this article, it will be understood that each box of the flowchart diagram and the combination of boxes in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for realizing the function specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-available or computer-readable memory, which can instruct the computer or other programmable data processing device to act in a particular way, so that the instructions stored in the computer-available or computer-readable memory produce an article of instruction device including the function specified in one or more flowchart boxes. The computer program instructions can also be loaded on a computer or other programmable data processing device so that a series of operating steps are performed on a computer or other programmable device to produce a computer-implemented process so that the instructions executed on the computer or other programmable device provide steps for realizing the function specified in one or more flowchart boxes.

[0038] In addition, each box of the flowchart diagram may represent a module, a fragment or a code portion, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative embodiments, the functions mentioned in the box may not occur in order. For example, two boxes shown in succession can actually be executed substantially simultaneously, or these boxes can sometimes be executed in reverse order, depending on the functions involved.

[0039] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have a meaning limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into a smaller number of elements or "units", or split into a larger number of elements or "units". In addition, elements and "units" can be implemented as one or more CPUs in a reproduction device or a secure multimedia card. In addition, "unit" in an embodiment can include one or more processors.

[0040] Various embodiments of the present disclosure describe a method in which, in a sidelink user equipment (UE) to network relay structure, a UE to a network remote UE simultaneously transmits a signal strength measurement result associated with the UE to the network relay UE and a signal strength measurement result associated with another base station, the UE to the network relay UE may be a target to which a path may be switched, and the other base station may be a target to which the path may be switched. In addition, a description associated with a method in which a base station receiving a signal strength measurement result determines a path switch for direct communication or a path switch for indirect communication via the UE to the network relay UE, or a description associated with a method in which a base station receiving a signal strength measurement result sends the signal strength measurement result to another base station that may be a target to which a path may be switched, via an inter-base station message, is provided.

[0041] According to various embodiments of the present disclosure, descriptions associated with a method in which a base station receiving a signal strength measurement result effectively determines a path switch of direct communication via an inter-base station message or a path switch of indirect communication via a UE to a network relay UE are provided.

[0042] According to various embodiments of the present disclosure, a UE may simultaneously send a signal strength measurement result associated with a UE to a network relay UE, to which a path may be switched, and a signal strength measurement result associated with another base station, to which a path may be switched, and may effectively determine a path switch for direct communication with a base station via inter-base station message transmission or a path switch for indirect communication via the UE to the network relay UE.

[0043] In the present disclosure, operations of a base station and operations of a UE according to various embodiments will be described.

[0044] Figure 1 is a diagram illustrating user equipment (UE) to network relay in a wireless communication system according to an embodiment of the present disclosure.

[0045] refer to Figure 1 , shows UE to network (U2N) relay UEs 120 and 130, which can support the operation of U2N relay UEs. U2N relay UEs 120 and 130 can be located in the coverage area 111 of base station 110, which corresponds to the in-coverage (IC) situation. In addition, Figure 1U2N remote UEs 140 and 150 capable of supporting the operation of U2N remote UEs are shown. In the case of in-coverage (IC), the U2N remote UEs 140 and 150 are located in the coverage area 111 of the base station 110. In the case of out-of-coverage (OOC), the U2N remote UEs 140 and 150 are not located in the coverage area 111 of the base station 110. The U2N remote UEs 140 and 150 may be sidelink UEs.

[0046] In addition, the uplink 112 and the downlink 113 between the base station 110 and the UEs 120 and 130 may be referred to as Uu interfaces, and the transmission links or reception links 121 and 131 with the side link UEs 140 and 150 may be referred to as PC5 interfaces. Hereinafter, the uplink or downlink 112 and 113 may be used interchangeably with the Uu interface, and the transmission links or reception links 121 and 131 between the side link UEs may be used interchangeably with the PC5 interface. In the case where data transmitted from the base station 110 to the U2N relay UEs 120 and 130 via the Uu links 112 and 113 according to the configuration of the base station 110 is data to be relayed to the U2N remote UEs 140 and 150, the U2N relay UEs 120 and 130 may transmit the data to the U2N remote UEs 140 and 150 via the PC5 links 121 and 131. In addition, the data sent from the U2N remote UEs 140 and 150 to the U2N relay UEs 120 and 130 via the PC5 links 121 and 131 is data to be relayed to the base station 110, and the U2N relay UEs 120 and 130 can send the data sent from the U2N remote UEs 140 and 150 to the base station 110 via the Uu links 112 and 113.

[0047] Figure 2 is a diagram illustrating a discovery message transmission or reception configuration from a UE to a network relay in a wireless communication system according to an embodiment of the present disclosure.

[0048] refer to Figure 2In operation 231, the base station may transmit a dedicated configuration for sidelink communication and a dedicated configuration for L2 U2N relay to the L2 U2N relay UE 220 via an RRC (e.g., RRCReconfiguration) message. In addition, in operation 232, the base station 230 may broadcast a SIB (System Information Block) message, or may receive a SIB transmission request from a UE, and transmit information indicating whether the base station 230 supports layer 2 (L2) U2N relay, a common configuration for sidelink communication, and a common configuration for L2 U2N relay to the L2 U2N relay UE 220. The common and dedicated configurations for sidelink communication may include a Tx pool and an Rx pool indicating resources for transmission and reception of sidelink data, and a discovery Tx pool and a discovery Rx pool indicating resources for transmission and reception of a sidelink discovery message. The public and private configurations for L2 U2N relay may include a configuration (sl-relayUE-config) that specifies conditions for transmission and reception of discovery messages of UE 220 for supporting the operation of L2U2N relay UE. In the case where the discovery Tx pool and the discovery Rx pool are configured, the transmission or reception of the discovery message of operation 240 is performed by using the corresponding resource pool. Otherwise, the transmission or reception may be performed by using the Tx pool and the Rx pool. The transmission and reception of the discovery message of operation 240 may be performed by using the described predetermined resource pool or by using resources not mentioned in the present disclosure. In the following, it is assumed that the UE that sends the discovery message and the UE that receives the discovery message have the same transmission and reception resource pools.

[0049] In operation 221, depending on a reference signal received power (RSRP) measurement result associated with a serving base station, the L2U2N relay UE 220 may determine the discovery message transmission or reception of operation 240 for transmitting information to a neighboring L2 U2N remote UE 210 that desires to receive a U2N relay service. In addition, the RSRP reference may be determined based on an RRC (e.g., RRCReconfiguration) message 231 or an SIB message 232 received from the base station 230. Specifically, in a case where a value obtained based on an RSRP measurement result and hysteresis associated with the base station 230 is less than a threshold value, information associated with at least one of threshHighRelay and hystMaxRelay may be included so that a discovery message is transmitted or received in operation 240. In addition, in a case where a value obtained based on an RSRP measurement result and hysteresis associated with the base station 230 is greater than a threshold value, information associated with at least one of threshLowRelay and hystMinRelay may be included so that a discovery message is not transmitted or received in operation 240.

[0050] In operation 233, the base station 230 may transmit a dedicated configuration for sidelink communication and a dedicated configuration for L2 U2N relay to the L2 U2N remote UE 210 via an RRC (e.g., RRCReconfiguration) message. In operation 234, the base station 230 may broadcast a SIB (System Information Block) message, or may transmit information on whether the base station 230 supports layer 2 (L2) U2N relay, a common configuration for sidelink communication, and a common configuration for L2 U2N relay to the L2 U2N remote UE 210 in response to an SIB transmission request from the UE. In addition, in a state of an out-of-coverage (OOC) state, the L2 U2N remote UE 210 may use a configuration for sidelink communication and a configuration for L2 U2N relay, which may be included in a pre-configured pre-configuration 211. The public and dedicated configurations and pre-configuration 211 for sidelink communication may include a TX pool and an RX pool indicating resources for transmission and reception of sidelink data, and a discovery TX pool and a discovery RX pool indicating resources for transmission and reception of sidelink discovery. The public and dedicated configurations for L2 U2N relay may include a configuration (sl-RemoteUE-Config) indicating conditions for transmission and reception of discovery messages of operation 240 for UE 210 supporting the operation of U2N remote UE. In operation 212, an RSRP reference for serving base station 230 may be configured for L2 U2N remote UE 210 via an RRC (e.g., RRCReconfiguration) message or SIB message received from base station 230, and U2N remote UE 210 performs transmission or reception of discovery messages of operation 240 using the RSRP reference. Specifically, in a case where a value obtained based on the RSRP measurement result and hysteresis associated with the base station 230 is less than a threshold value, threshHighRemote and hystMaxRemote may be included so that a discovery message is transmitted or received in operation 240. In the case of OOC, the L2U2N remote UE 210 may always transmit and receive a discovery message in operation 240. In the measurement report transmitted to the base station 230, the L2 U2N remote UE 210 may include a measurement result of a discovery message transmitted from the L2 U2N relay UE 220 as SD-RSRP, and may include a measurement result of side link data transmitted from the L2 U2N relay UE 220 as SL-RSRP.

[0051] Figure 3 is a diagram illustrating a direct path and an indirect path for configuring a UE network relay according to an embodiment of the present disclosure.

[0052] refer to Figure 3 , the L2 U2N remote UE 320 may perform direct communication with the base station 310 via a Uu link 311, and in this instance, the Uu link 311 communicating with the base station 310 may be referred to as a direct path. In addition, the L2 U2N remote UE 320 may communicate with the base station 310 via a L2 U2N relay UE 330. The PC5 link 331 between the L2 U2N remote UE 320 and the L2 U2N relay UE 330 or the Uu link (indirect path 312) between the L2 U2N relay UE 330 and the base station 310 may be referred to as an indirect path. The base station 310 may configure a measurement configuration regarding the L2 U2N remote UE 320 so as to receive a wireless measurement result associated with a neighboring NR cell of the L2 U2N remote UE 320 or a wireless measurement result associated with a neighboring U2N relay UE 340 via a measurement report sent from the L2 U2N remote UE 320. The base station 310 may receive the measurement report transmitted from the L2 U2N remote UE 320, and based on the measurement result, may proceed with the direct-to-indirect path switching process of changing the L2 U2N remote UE 320 from the direct path (Uu link 311) to the indirect paths 312 and 331, or may proceed with the indirect-to-direct path switching process of changing the indirect paths 312 and 331 to the direct path (Uu link 311). In addition, the base station 310 may proceed with the indirect-to-indirect path switching process of changing the indirect paths 312 and 331 to another indirect paths 313 and 341.

[0053] In an OOC situation where the L2 U2N remote UE 320 happens to move to the coverage edge of the base station or out of the coverage area of ​​the base station, the L2 U2N remote UE 320 can receive a service via an indirect path without disconnecting the service by performing a direct-to-indirect path switching procedure of changing to an indirect path via the L2 U2N relay UEs 330 and 340. In addition, in a situation where the L2 U2N remote UE 320 moves closer to the center of the coverage area of ​​the serving base station or another base station, the L2 U2N remote UE 320 can receive a service via an indirect-to-direct path switching procedure of changing to a direct path again. In addition, when the L2 U2N remote UE 320 is receiving a service via an indirect path via the serving L2 U2N relay UE 330, the service (service continuity) can be continuously provided via an indirect-to-indirect path switching procedure of changing to an indirect path of another L2 U2N relay UE 340.

[0054] Although the path switching in a single base station 310 has been described as an example, for service continuity from UE to network relay, indirect to direct path switching to another base station, direct to indirect path switching to an L2 U2N relay UE served by another base station, and indirect to indirect path switching to an L2 U2N relay UE served by another base station may also be supported. A measurement reporting process and a path switching process for determining path switching will be described below with reference to other drawings.

[0055] Figure 4A , Figure 4B and Figure 4C is a diagram illustrating measurement reporting for inter-base station path switching in a UE to network relay according to various embodiments of the present disclosure.

[0056] Figure 4A is a diagram showing that a base station configures a measurement configuration regarding a U2N remote UE and receives a measurement report according to an embodiment of the present disclosure.

[0057] refer to Figure 4A , the base station 430 may transmit an RRC (e.g., RRCReconfiguration) message to the L2 U2N remote UE 410 via a direct link 432 in operation 431, or may transmit the RRC message via an indirect link 433 by using the L2 U2N relay UE 420. In addition, the base station 430 may configure a measurement configuration in order to receive a measurement result of the L2 U2N remote UE 410. The base station 430 according to various embodiments of the present disclosure may be a serving base station, and the serving base station 430 may be a base station including a primary cell (PCell), a primary secondary cell (PSCell), or a special cell (SpCell), which performs transmission and reception of an RRCReconfiguration message with the L2 U2N remote UE 410 via a direct link 432 or an indirect link 433 in operation 431. The neighboring base station and the target base station may be other base stations different from the serving base station. In addition, the serving L2 U2N relay UE 420 may be an L2 U2N relay UE constituting an indirect link 433 used when the L2U2N remote UE 410 communicates with the serving base station 430, and the neighboring L2 U2N relay UE and the target L2 U2N relay UE may be other L2 U2N relay UEs different from the serving L2U2N relay UE. Hereinafter, NR and sidelink will be described, however, the method described in the present disclosure is not limited to the above combination, and the embodiments may be applicable to other communication systems having similar technical backgrounds or channel forms.

[0058] The measurement configuration may include at least one of a measurement object, a report configuration, and a measurement identity.

[0059] The measurement object may include information for measuring an object including at least one of NR, EUTRA, UTRA-FDD and a side link. The NR measurement object may include at least one of a frequency, a subcarrier spacing (SCS), a reference signal configuration (RSS), a list of allowed / excluded cells, an object-specific offset and a cell-specific offset for measuring an NR cell, and may be configured in the form of measObjectNR. In addition, the sidelink measurement object may include an SL-MeasObject and a sidelink measurement object identifier (SL-MeasObjectId), the SL-MeasObject including a frequency for measuring a sidelink UE, the sidelink measurement object identifier (SL-MeasObjectId) corresponding one-to-one to the frequency and being unique for each UE, and may be configured in the form of measObjectRelay. measObjectNR or measObjectRelay may correspond one-to-one to a measurement object identifier, and the measurement object identifier may be configured in the form of a measObjectId unique to each UE, and thus different measurement objects may be distinguished.

[0060] The report configuration may be configured by including an event trigger configuration in the report type. The event trigger configuration may include parameters for determining the entry and exit conditions of the events defined in 3GPP TS 38.331, and may include at least one threshold, offset, trigger time (TTT), and hysteresis. In addition, a report interval, a report amount, a cell report measurement unit (report quantity cell), and a relay report measurement unit (report quantity relay) may be included in the event trigger configuration. The report configuration may correspond to a report configuration identifier one-to-one, and the report configuration identifier may be configured in the form of a reportConfigId unique to each UE, and thus different report configurations may be distinguished.

[0061] The measurement identity may be associated with one measObjectId and one reportConfigId, and may correspond one to one. For example, in the case of a single measurement identity, a combination of one measObjectId and one reportConfigId may be expressed in the form of a measId unique to each UE, and thus different measurement identities may be distinguished.

[0062] The L2 U2N remote UE 410 may obtain the layer 1 measurement result and layer 1 filtering result associated with the Uu link or PC5 link of the other side link UE or NR cell according to the requirements of 3GPP TS 38.133 and the process of 3GPP TS 38.300 by using the reference signal configured in the measurement configuration. In the case of the layer 1 filtering result, according to the process of 3GPP TS 38.331, layer 3 filtering may be performed during beam combining / selection and TTT to obtain the quality of the Uu link or PC5 link. Subsequently, the L2 U2N remote UE 410 may evaluate the quality of the Uu link or PC5 link in order to send the measurement result based on the reporting configuration. The layer 1 measurement method and layer 1 filtering associated with the PC5 link and the Uu link are performed according to the implementation of the UE and the requirements of 3GPP TS 38.133. The beam combining / selection and layer 3 filtering process for obtaining the Uu link or PC5 link measurement result for evaluation may be performed according to 3GPP TS 38.331. In addition, the cell quality after layer 3 filtering or PC5 quality may be used interchangeably with terms such as Uu link measurement result, PC5 link measurement result, etc. In addition, the L2 U2N remote UE may receive a Uu link measurement unit and a measurement result associated with a serving cell of the L2 U2N relay UE measured by the L2 U2N relay UE via a discovery message or a PC5-RRC message.

[0063] The measurement results may be expressed as absolute or relative values, and depending on the range-based indicator, the measurement results may be rounded or may be expressed differently than the actual measured value.

[0064] In the case where the evaluation in operation 411 indicates that the Uu link or PC5 link measurement result satisfies the measurement report trigger evaluation condition and the entry or exit condition based on the report configuration, the L2 U2N remote UE 410 can send a measurement report message 412 to the serving base station 430 via a direct link 413 or an indirect link 414. In the case of the Uu link or PC5 link measurement result, RSRP, RSRQ, SINR, SD-RSRP, SL-RSRP or CBR configured in the report quantity cell or report quantity relay or report quantity sidelink can be used, and the measurement result obtained for each cell in units of side link UE, SSB and CSI-RS can be used. In addition, the distance between the measured UE and the reference position and the interference value of the measured UE can be used. The measurement of each quantity can be performed according to the requirements of 3GPP TS 38.133 and the definition in 3GPP TS 38.331. The measurement report triggering condition may be based on the definition and process in 3GPP TS 38.331, and at least one of the following conditions may be combined and configured as an entry or exit condition: a condition that the Uu link or PC5 link measurement result of the measured UE is greater than or less than a threshold, a condition that the difference in the Uu link measurement result between a Uu link and another Uu link is greater than or less than an offset, a condition that the difference in the PC5 link measurement result between a PC5 link and another PC5 link is greater than or less than an offset, a condition that the difference between the position of the measured UE and a reference position according to a Uu link measurement result associated with a service cell measured by a UE having a PC5 link measurement result in association with a discovery message is greater than or less than a threshold, and a condition that the interference of the measured UE is greater than or less than a threshold. In addition, in association with the Uu link measurement result, configuration may be performed so that measurement results associated with a service cell, a PSCell, a SpCell, a SCell, or other cells may be used for evaluation. In association with the PC5 link measurement result, configuration may be performed so that measurement results associated with the serving L2 U2N relay UE 420 or another L2 U2N relay UE may be combined and used for evaluation. In such a case, even without specification of a measurement object, the serving cell, PSCell, SpCell, SCell, and serving L2 U2N relay UE with which the measured UE performs communication via a Uu link or a PC5 link may be included in the measurement report triggering condition. Each measurement result may be evaluated by increasing or decreasing the result value according to an object-specific offset and a cell-specific offset included in the measurement configuration, and the evaluation may be performed based on an entry or exit condition based on an additional value based on hysteresis.The measurement report triggering evaluation condition may be expressed in the form of a report triggering event.

[0065] The measurement report message 412 may include a measurement identifier of a measurement configuration that triggers a measurement report, one or more Uu link measurement results that meet the reporting condition evaluation, and one or more PC5 link measurement results that meet the reporting condition evaluation. Specifically, the Uu link measurement result may include a serving cell index of the measured cell, a cell identifier of the measured cell, a physical cell identifier of the measured cell, a measurement unit for evaluating the reporting condition, and one or more pieces of information among the measurement results for evaluating the reporting condition. The PC5 link measurement result may include a serving cell identifier of the measured L2 U2N relay UE, a serving cell PLMN identifier of the measured L2 U2N relay UE, a source identifier of the measured L2 U2N relay UE, a measurement unit for evaluating the reporting condition, a measurement result for evaluating the reporting condition, a Uu link measurement unit associated with the serving cell of the L2 U2N relay UE measured by the L2 U2N relay UE, and one or more pieces of information among the Uu link measurement results associated with the serving cell of the L2 U2N relay UE measured by the L2 U2N relay UE.

[0066] Figure 4B 2 is a diagram illustrating additional information in a measurement report and transmitting the additional information according to an embodiment of the present disclosure.

[0067] like Figure 4A As described in Figure 4B In the case of a single measurement identifier, a combination of a measObjectId and a reportConfigId is expressed in the form of a measId that is unique to each UE, and thus different measurement identifiers can be distinguished. In addition, the measurement report may include a measurement identifier of the measurement configuration that triggers the measurement report. Therefore, a single measurement report may include a value evaluated based on a measObjectId and a reportConfigId, and be reported. In the presence of two or more frequencies or two or more evaluation conditions that need to be measured by the UE performing the report, receiving only a single measurement report may provide insufficient information for the serving base station to determine various operations including path switching, handover, secondary cell group addition and modification, and secondary cell addition and modification. In order to receive the various measurement reports required to make such a decision, additional configuration and delay time may be incurred until the measurement report is received. Therefore, the method of including the various pieces of information requested by the base station in a single measurement report can reduce delay time and signaling overhead.

[0068] refer to Figure 4B, via the direct link 432 or the indirect link 433, the base station 430 may send an RRC (e.g., RRCReconfiguration) message in operation 434, the RRC message including a configuration for including additional information (additional report) in the measurement report sent by the UE. In the case where the evaluation in operation 411 indicates that the Uu link or PC5 link measurement result satisfies the measurement report triggering evaluation condition and the entry or exit condition based on the report configuration, the L2 U2N remote UE 410 may send a measurement report message 412 to the serving base station 430 via the direct link 413 or the indirect link 414.

[0069] In the following, with Figure 4A The reporting conditions and reporting results associated with the measurement identification described in are described as the terms main reporting conditions and main reporting results, respectively, and the reporting conditions and reporting results based on the additional configurations are described as the terms additional reporting conditions and additional reporting results, respectively.

[0070] Configuration method 1: For additional reporting, the base station may configure one or more of the following information for the measurement identifier.

[0071] - Additional report configuration: Configuration for including Uu link measurement results in additional report results or including PC5 link measurement results in additional report results, which can be provided in the form of indicating whether to apply or not apply, or in the form of a list or a single value including one or more of the additional report objects or additional report conditions.

[0072] - Additional reporting objects measObjectId, i.e., in the form of a list or a single value of measObjectId.

[0073] - Additional reported objects SL-measObjectId, i.e. in the form of a list or a single value of SL-measObjectId.

[0074] - Additional reporting conditions reportConfigId, i.e. in the form of a list or a single value of reportConfigId.

[0075] - Main report condition for including additional reports reportConfigId, i.e. in the form of a list or a single value of reportConfigId.

[0076] Configuration method 2: In order to configure a measurement object for additional reporting, the base station may configure one or more of the following information for main reporting for the measurement object.

[0077] - Additional report configuration: Configuration for including Uu link measurement results in additional report results or including PC5 link measurement results into additional report results, which may be provided in the form of indicating application or non-application, or in the form of a list or a single value including additional report objects.

[0078] - Additional reporting objects: NR measurement object identities, i.e. in the form of a list or a single value of measObjectid.

[0079] - Additional reporting object: Sidelink measurement object identity, i.e. in the form of a list or a single value of SL-MeasObjectId.

[0080] - Additional reporting objects: Parameters included in the NR measurement object, i.e. in the form of a list or a single value of at least one parameter among the frequency, subcarrier spacing, reference signal configuration, allowed / excluded cell list, object-specific offset and cell-specific offset used to measure the NR cell.

[0081] - Additional reporting object: Parameters included in the sidelink measurement object, i.e., in the form of a list or a single value of at least one parameter in sl-MeasObject, sl-MeasObject includes a sidelink measurement object identifier used to measure the frequency of the sidelink UE, which corresponds one-to-one to the frequency and is unique to each UE.

[0082] Configuration method 3: In order to configure the report configuration for the additional report, the base station may configure one or more of the following information for the report configuration for the main report.

[0083] - Additional report configuration: Configuration for including Uu link measurement results in additional report results or including PC5 link measurement results in additional report results, which can be provided in the form of indicating whether to apply or not apply, or in the form of a single value or list including one or more of the additional report objects or additional report conditions.

[0084] - Additional reporting objects: NR measurement object identities, i.e. in the form of a list or a single value of measObjectid.

[0085] - Additional reporting object: Sidelink measurement object identity, i.e. in the form of a list or a single value of SL-MeasObjectId.

[0086] - Additional report objects: NR measurement objects, i.e. in the form of a list or a single value of measObject.

[0087] - Additional reporting objects: Sidelink measurement objects, i.e. in the form of a list or a single value of SL-MeasObject.

[0088] - Additional reporting conditions: One or more report configuration identifiers, i.e. in the form of a list or a single value of reportConfigId.

[0089] - Additional reporting conditions: provided in the form of a report triggering event, or including at least one of one or more thresholds, offsets, TTT, hysteresis, report quantity cell, and report quantity relay, and the evaluation conditions can be configured as Figure 2 The evaluation conditions described in .

[0090] - Main reporting conditions for including additional reports: provided in the form of a report triggering event, or including at least one of one or more thresholds, offsets, TTT, hysteresis, report quantity cell, and report quantity relay, and the evaluation conditions can be configured as Figure 2 The evaluation conditions described in B.

[0091] In operation 434, the base station may send at least one of an additional report configuration, an additional report object, an additional report condition, and a primary report condition for including an additional report to the UE via an RRC (e.g., RRCReconfiguration) message by using at least one of methods 1, 2, and 3. In a case where at least one of the additional report object, the additional report condition, and the primary report condition for including an additional report is configured, the U2N remote UE 410 that receives the RRCReconfiguration message in operation 434 may implicitly recognize that the additional report is configured.

[0092] In the case where the measurement report of operation 416 reported by the U2N remote UE 410 to the base station 430 includes an additional report result, the measurement identifier of the measurement configuration in which the additional report is configured, one or more Uu link measurement results satisfying the additional report condition evaluation, and one or more PC5 link measurement results satisfying the additional report condition evaluation may be included. Specifically, the Uu link measurement result may include one or more pieces of information including a serving cell index, a cell identifier, a physical cell identifier, a measurement unit for evaluating the additional report condition, and a measurement result for evaluating the additional report condition of the measured cell, and the PC5 result link measurement result may include a serving cell identifier of the measured UE, a serving cell PLMN identifier, a source identifier, a measurement unit for evaluating the additional report condition, a measurement result for evaluating the additional report condition, a Uu link measurement unit associated with the serving cell of the L2 U2N relay UE measured by the L2 U2N relay UE, and one or more pieces of information including a Uu link measurement result associated with the serving cell of the L2 U2N relay UE measured by the L2 U2N relay UE.

[0093] Figure 4C 1 is a diagram illustrating a measurement reporting operation performed by an L2 U2N remote UE according to an embodiment of the present disclosure. Specifically, an example is provided in which the L2 U2N remote UE evaluates a Uu link measurement result or a PC5 link measurement result based on a primary reporting condition, and includes an additional reporting result in the measurement result when transmitting the measurement result based on an evaluation result of an additional reporting condition.

[0094] refer to Figure 4C In operation 441, the L2 U2N remote UE may determine whether the Uu link or PC5 link measurement result satisfies the primary reporting condition. In the case where the Uu link or PC5 link measurement result satisfies the evaluation based on the primary reporting condition, the L2 U2N remote UE proceeds to operation 442 to determine whether additional reporting is configured.

[0095] In operation 442, the L2 U2N remote UE may determine whether additional reporting is configured. In the case where additional reporting is not configured, the L2 U2N remote UE may proceed to operation 450 and may send a measurement result excluding the additional reporting result to the serving base station. In the case where additional reporting is configured, the L2 U2N remote UE may proceed to operation 443 and may determine whether a primary reporting condition for including additional reporting is configured.

[0096] In operation 443, the L2 U2N remote UE may determine whether a primary reporting condition for including an additional report is configured. In the case where the primary reporting condition for including an additional report is not configured, the L2 U2N remote UE may perform operation 445 and may evaluate the additional reporting condition. In the case where the primary reporting condition for including an additional report is configured, the L2 U2N remote UE may perform operation 444 and may evaluate the primary reporting condition for including an additional report.

[0097] In operation 444, the L2 U2N remote UE may evaluate whether the measurement result satisfies the main reporting condition including the additional report. If the main reporting condition for including the additional report is not satisfied, the L2U2N remote UE may proceed to operation 450 and may send the measurement result excluding the additional report result to the serving base station. If the main reporting condition for including the additional report is satisfied, the L2U2N remote UE may proceed to operation 445 and may evaluate the additional report condition.

[0098] In operation 445, the L2 U2N remote UE may evaluate the additional reporting condition. If the additional reporting condition is not satisfied, the L2 U2N remote UE may proceed to operation 450 and may send the measurement result excluding the additional reporting result to the serving base station. If the additional reporting condition is satisfied, the L2 U2N remote UE may proceed to operation 460 and may send the measurement result including the additional reporting result to the serving base station.

[0099] Figure 5A and Figure 5B is a diagram illustrating an inter-base station path switching operation in a UE-to-network relay according to various embodiments of the present disclosure.

[0100] like FIG. 4A to FIG. 4C As shown in, reference Figure 5A and Figure 5B , the serving base station of the L2 U2N remote UE may receive measurement results associated with one or more L2 U2N relay UEs or measurement results associated with one or more neighboring base stations, respectively or in parallel, via one or more measurement reports sent by the L2 U2N remote UE via a direct path or an indirect path.

[0101] refer to Figure 5ABased on the measurement report 511 received via the direct or indirect path, the serving base station 530 of the L2 U2N remote UE 510 may determine the path switching of the L2 U2N remote UE 510 in operation 531, and may determine the direct path switching or the indirect path switching in operation 532. In operation 533, by using the measurement result of the L2 U2N remote UE 510 associated with another base station and information associated with the other base stations, that is, at least one of the load information associated with the other base stations, the information associated with whether there is an XnAP connection with the other base stations, and the success rate of the path switching (switch) or handover (handover) previously performed with the other base stations, the serving base station 530 may determine the target base station 540 to which the path is to be switched for direct path switching. In addition, by using the measurement result of the L2 U2N remote UE 510 associated with the L2 U2N relay UE and at least one piece of information among the reported information associated with the serving base station of the L2 U2N relay UE, the serving base station 530 may determine, in operation 533, a target L2 U2N relay UE 520 to which a path is to be switched for indirect path switching, and may determine the serving base station of the target L2 U2N relay UE 520 as a target base station 540. Hereinafter, the target L2 U2N relay UE 520 may be an L2 U2N relay UE to which a path is to be switched for indirect path switching among one or more L2 U2N relay UEs reported by the L2 U2N remote UE 510. The target base station 540 may be a base station to which a path among one or more neighboring base stations reported by the L2 U2N remote UE 510 is to be switched for direct path switching, or may be a serving base station of the target L2 U2N relay UE 520 to which a path is to be switched for indirect path switching.

[0102] The serving base station 530 may send an XnAP handover request message 534 to the target base station 540 to request a direct path handover or an indirect path handover. In the case where a path handover needs to be performed by using NGAP because an XnAP connection is not configured or for other reasons, the serving base station 530 may send an NGAP handover requirement message to the AMF to request a direct path handover to the target base station 540 or an indirect path handover to the target L2 U2N relay UE 520. In the case of performing a direct path handover, the process and content of the XnAP handover request message 534 may be based on the definition in 3GPP TS 38.300. In the case of performing an indirect path handover, the XnAP handover request message 534 for the direct path handover may additionally include indirect path handover indication information, an identifier of the target L2 U2N relay UE 520, and a measurement result associated with the target L2 U2N relay UE 520 reported by the L2 U2N remote UE. Hereinafter, although only a path switching process using XnAP is described, the embodiments may be easily modified and applied to a path switching process using NGAP. The target base station 540 may distinguish between direct path switching or indirect path switching via indication information included in the XnAP switching request message 534 received from the serving base station 530, and may determine whether to allow direct path switching or indirect path switching via admission control in operation 541 based on information recognized by the target base station 540 (e.g., a success rate of a path switching or switching previously performed with the serving base station 530, load information of the target base station, quality of a Uu link with the target L2 U2N relay UE 520, RRC state of the target L2 U2N relay UE 520, etc.). In the case of allowing path switching, the target base station 540 may send an XnAP switching request confirmation message 543 to the serving base station 530, the XnAP switching request confirmation message 543 including an RRC transparent container to be sent to the L2 U2N remote UE 510. In the case of an indirect path switch, the target base station 540 may send U2N relay configuration information associated with the L2 U2N remote UE 510 to the target L2 U2N relay UE 520 via an RRCReconfiguration message 542. In the case where the serving base station 530 receives an XnAP handover request confirmation message 543 from the target base station 540, the serving base station may send an RRCReconfiguration message 535 including ReconfigurationWithSync to indicate a direct or indirect path switch to the L2 U2N remote UE 510.In the case where a direct path switch is indicated to the L2 U2N remote UE 510, the L2 U2N remote UE 510 may send an RRCReconfigurationComplete message 512 to the target base station 540 via a direct path 513, and the path switch may be completed. Alternatively, in the case where an indirect path switch is indicated, the L2 U2N remote UE 510 may send an RRCReconfigurationComplete message 512 to the target base station 540 via an indirect link 514 of the target L2 U2N relay UE 520 indicated by the serving base station 530.

[0103] Figure 5B is a diagram illustrating an inter-base station path switching operation in a UE-to-network relay according to an embodiment of the present disclosure.

[0104] refer to Figure 5BBased on the received measurement report 511, the serving base station 530 of the L2 U2N remote UE 510 may determine the path switching of the L2 U2N remote UE 510 in operation 531, and may regard another base station or L2 U2N relay UE as an object to which the path can be switched. In operation 536, by using the measurement result of the L2 U2N remote UE 510 associated with another base station and information associated with another base station, that is, at least one of the load information associated with the other base station, the information associated with whether there is an XnAP connection with the other base station, the path switching previously performed with the other base station or the success rate of the switching, etc., the serving base station 530 may determine the target base station 540 to which the path is to be switched for direct path switching. In addition, by using the measurement result of the L2 U2N remote UE 510 associated with the L2 U2N relay UE and at least one of the reported information associated with the serving base station of the L2 U2N relay UE, the serving base station 530 may determine the base station serving one or more L2 U2N relay UEs as the target base station 540, and the one or more L2 U2N relay UEs may be the object to which the path is to be switched for indirect path switching. In the case where the serving base station 530 determines that a single target base station 540 can be used for both direct path switching and indirect path switching, or determines that a single target base station 540 can be used for indirect path switching, in operation 544, the serving base station 530 may send an XnAP switching request message 537 to the target base station 540, so that the target base station 540 determines the direct path switching or the indirect path switching and the target L2U2N relay UE 520. Via the XnAP handover request message 537, the serving base station 530 may transmit a path switch request and information required for determining a direct path switch or an indirect path switch and an operation 544 of the target L2 U2N relay UE 520. The XnAP handover request message 537 may include one or more of measurement results associated with the target base station 540 and the L2 U2N remote UE 510, measurement results associated with one or more L2 U2N relay UEs served by the target base station 540 and the L2 U2N remote UE 510, and identifications of the one or more L2 U2N relay UEs served by the target base station 540.Based on the information included in the XnAP handover request message 537 received from the serving base station 530 and one or more pieces of information among the information identified by the target base station 540, i.e., the success rate of the path switch and handover previously performed with the serving base station 530, the load information of the target base station 540, the quality of the Uu link with the L2 U2N relay UE, and the radio resource control (RRC) state information of the L2 U2N relay UE, the target base station 540 may determine, in operation 544, an L2 U2N relay UE among the one or more L2 U2N relay UEs included in the XnAP handover request message 537 as the target L2 U2N relay UE 520. In operation 544, the target base station 540 may select one of a direct path switch or an indirect path switch with respect to the target L2 U2N relay UE 520. In the case where the admission control 541 allows direct or indirect path switching, the target base station 540 may send an XnAP handover request confirmation message 543 to the serving base station 530, the message including an RRC transparent container to be sent to the L2 U2N remote UE 510. In the case of indirect path switching, the target base station 540 may include one or more of the information indicating determination of the indirect path switching and the identifier of the target L2 U2N relay UE 520 in the XnAP handover request confirmation message 543 to notify the serving base station 530 that the indirect path switching is to be performed. The target base station 540 may send an RRCReconfiguration message 542 to the target L2 U2N relay UE 520, the RRCReconfiguration message 542 including U2N relay configuration information associated with the L2U2N remote UE 510. In the case where the serving base station 530 receives the XnAP handover request confirmation message 543 from the target base station 540, the serving base station 530 may send an RRCReconfiguration message 535 to the L2 U2N remote UE 510, the RRCReconfiguration message 535 including ReconfigurationWithSync for indicating a direct or indirect path switch. In the case where a direct path switch is indicated, the L2 U2N remote UE 510 may send an RRCReconfigurationComplete message 512 to the target base station 540 via a direct path 513, and the path switch may be completed. In the case where an indirect path switch is indicated, the L2 U2N remote UE 510 may send an RRCReconfigurationComplete message 512 to the target base station 540 via an indirect link 514 of the target L2 U2N relay UE 520 indicated by the serving base station 530.

[0105] Figure 6 is a diagram showing a structure of a base station according to an embodiment of the present disclosure.

[0106] refer to Figure 6 , the base station may include a transceiver 610, a controller 620, and a storage device 630. According to the above communication method of the base station, the transceiver 610, the controller 620, and the storage device 630 may operate. The network device may also correspond to the structure of the base station. However, the constituent elements of the base station are not limited to the above examples. For example, the base station may include more or less constituent elements than the above constituent elements. For example, the base station may include a transceiver 610 and a controller 620. In addition, the transceiver 610, the controller 620, and the storage device 630 may be configured as a single chip.

[0107] The transceiver 610 is a general term for the receiver of the base station and the transmitter of the base station, and may be able to perform signal transmission or reception with the UE, another base station or other network equipment. The signal transmitted or received by the base station may include control information and data. The transceiver 610 may send, for example, system information to the UE, and may send a synchronization signal or a reference signal. To this end, the transceiver 610 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that low-noise amplifies the received signal and down-converts the frequency of the received signal, etc. This is only an example of the transceiver 610, and the component elements of the transceiver 610 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 610 may include a wired and wireless transceiver, and may include various configurations for transmitting or receiving signals. In addition, the transceiver 610 may receive a signal via a communication channel (e.g., a wireless channel) and output it to the controller 620, and may send a signal output from the controller 620 via a communication channel. In addition, the transceiver 610 may receive a communication signal and may output it to a processor, and may send a signal output from the processor to a UE, another base station or other entity via a wired or wireless network.

[0108] The storage device 630 may store programs and data required for the base station to operate. In addition, the storage device 630 may store control information or data included in the signal obtained by the base station. The storage device 630 may be embodied as a storage medium, such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk-ROM (CD-ROM), a digital versatile disk (DVD), etc., or a combination of storage media. The storage device 630 may store at least one of the information sent or received via the transceiver 610 and the information generated by the controller 620.

[0109] In the present disclosure, the controller 620 may be defined as a circuit, an application specific integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs control for communication, and an application processor (AP) that controls a higher layer (such as an application program, etc.). The controller 620 may control the overall operation of the base station according to an embodiment of the present disclosure. For example, the controller 620 may control the signal flow between blocks so that operations based on the above-mentioned flowchart are performed.

[0110] Figure 7 is a diagram showing a structure of a user equipment (UE) according to an embodiment of the present disclosure.

[0111] refer to Figure 7 , the UE may include a transceiver 710, a controller 720, and a storage device 730. According to the above communication method of the UE, the transceiver 710, the controller 720, and the storage device 730 may operate. However, the constituent elements of the UE are not limited to the above examples. For example, the UE may include more or less component elements than the above component elements. For example, the UE may include a transceiver 710 and a controller 720. In addition, the transceiver 710, the controller 720, and the storage device 730 may be configured as a single chip.

[0112] The transceiver 710 is a general term for the receiver of the UE and the transmitter of the UE, and may be able to perform signal transmission or reception with the UE, another UE or a network entity. The signal transmitted or received by the base station may include control information and data. The transceiver 710 may receive, for example, system information from the base station, and may receive a synchronization signal or a reference signal. To this end, the transceiver 710 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that low-noise amplifies the received signal and down-converts the frequency of the received signal, etc. This is only an example of the transceiver 710, and the component elements of the transceiver 710 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 710 may include a wired and wireless transceiver, and may include various configurations for transmitting or receiving signals. In addition, the transceiver 710 may receive a signal via a wireless channel and output it to the controller 720, and may send a signal output from the controller 720 via a wireless channel. In addition, the transceiver 710 may receive a communication signal and may output it to a processor, and may send a signal output from the processor to a network entity via a wired or wireless network.

[0113] The storage device 730 may store programs and data required for the UE to operate. In addition, the storage device 730 may store control information or data included in the signal obtained by the UE. The storage device 730 may be embodied as a storage medium, such as ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media.

[0114] In the present disclosure, the controller 720 may be defined as a circuit, a dedicated integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs control for communication, and an application processor (AP) that controls a higher layer (such as an application program, etc.). The controller 720 may control the overall operation of the UE according to an embodiment of the present disclosure. For example, the controller 720 may control the signal flow between blocks so that operations based on the above-mentioned flowchart are performed.

[0115] The methods according to various embodiments described in the claims or specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0116] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. At least one program may include instructions for causing an electronic device to perform a method according to various embodiments of the present disclosure as defined by the appended claims and / or disclosed herein.

[0117] The program (software module or software) can be stored in a non-volatile memory, including random access memory and flash memory, ROM, electrically erasable programmable read-only memory (EEPROM), magnetic disk storage device, CD-ROM, DVD or other type of optical storage device, or magnetic tape cassette. Alternatively, any combination of some or all of them can form the memory in which the program is stored. In addition, a plurality of such memories can be included in the electronic device.

[0118] In addition, the program can be stored in an attachable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), and a storage area network (SAN) or a combination thereof. Such a storage device can access the electronic device via an external port. In addition, a separate storage device on a communication network can access the portable electronic device.

[0119] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiments presented. However, for ease of description, the singular form or plural form is appropriately selected for the presented situation, and the present disclosure is not limited to the elements expressed in the singular or plural. Therefore, the elements expressed in the plural may also include a single element, or the elements expressed in the singular may also include multiple elements.

[0120] Although specific embodiments have been described in the detailed description of the present disclosure, it is clear that various modifications and changes can be made thereto without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the embodiments, but should be defined by the appended claims and their equivalents.

Claims

1. A method performed by a base station (BS) in a wireless communication system, the method comprising: sending a radio resource control (RRC) message including measurement configuration information to a user equipment (UE) via a direct path or an indirect path via a relay UE; as well as Receive a measurement report MeasurementReport message including the measurement result from the UE through a direct path or an indirect path via a relay UE, The measurement results include a first measurement result of a directional communication (PC5) link and a second measurement result of a Uu link.

2. The method according to claim 1, wherein: The measurement configuration information includes at least one of a measurement object, a report configuration and a measurement identifier.

3. The method according to claim 1, in, The first measurement result indicates a result that satisfies a first reporting condition of the PC5 link, and The second measurement result indicates a result that satisfies a second reporting condition of the Uu link.

4. The method according to claim 2, wherein: In case that the measurement configuration information includes additional report information for additional measurement, the MeasurementReport message includes the additional measurement result corresponding to the additional report information.

5. A base station (BS) of a hosting network in a wireless communication system, the BS comprising: transceiver, and At least one processor coupled to the transceiver and configured to: sending a radio resource control (RRC) message including measurement configuration information to a user equipment (UE) via a direct path or an indirect path via a relay UE, and Receive a MeasurementReport message including the measurement result from the UE via a direct path or an indirect path via a relay UE, The measurement results include a first measurement result of the PC5 link and a second measurement result of the Uu link.

6. The BS according to claim 5, wherein: The measurement configuration information includes at least one of a measurement object, a report configuration and a measurement identifier.

7. The BS according to claim 5, in, The first measurement result indicates a result that satisfies a first reporting condition of the PC5 link, and The second measurement result indicates a result that satisfies a second reporting condition of the Uu link.

8. The BS according to claim 6, wherein: In case that the measurement configuration information includes additional report information for additional measurement, the MeasurementReport message includes the additional measurement result corresponding to the additional report information.

9. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving a radio resource control (RRC) message including measurement configuration information from a base station (BS) through a direct path or an indirect path via a relay UE; as well as Send a MeasurementReport message including the measurement results to the BS via a direct path or an indirect path via a relay UE. The measurement results include a first measurement result of the PC5 link and a second measurement result of the Uu link.

10. The method according to claim 9, wherein: The measurement configuration information includes at least one of a measurement object, a report configuration and a measurement identifier.

11. The method according to claim 9, in, The first measurement result indicates a result that satisfies a first reporting condition of the PC5 link, and The second measurement result indicates a result that satisfies a second reporting condition of the Uu link.

12. The method according to claim 10, wherein: In case that the measurement configuration information includes additional report information for additional measurement, the MeasurementReport message includes the additional measurement result corresponding to the additional report information.

13. A user equipment (UE) in a wireless communication system, the UE comprising: transceiver, and At least one processor coupled to the transceiver and configured to: receiving a radio resource control (RRC) message including measurement configuration information from a base station (BS) through a direct path or an indirect path via a relay UE, and Send a MeasurementReport message including the measurement results to the BS via a direct path or an indirect path via a relay UE. The measurement results include a first measurement result of the PC5 link and a second measurement result of the Uu link.

14. The UE according to claim 13, wherein: The measurement configuration information includes at least one of a measurement object, a report configuration, and a measurement identifier, and In the case where the measurement configuration information includes additional report information for additional measurement, the MeasurementReport message includes the additional measurement result corresponding to the additional report information.

15. The UE according to claim 13, in, The first measurement result indicates a result that satisfies a first reporting condition of the PC5 link, and The second measurement result indicates a result that satisfies a second reporting condition of the Uu link.

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