Method and apparatus for performing QOE measurement for MBS broadcast service in next mobile communication system

Abstract

The present disclosure relates to a 5th-Generation (5G) or 6th-Generation (6G) communication system for supporting higher data rates. A method and apparatus for performing Quality of Experience Measurement (QoE) and reporting for a Multimedia Broadcast Service (MBS) service are provided.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for performing Quality of Experience (QoE) measurement and reporting for a Multimedia Broadcast Service (MBS) service. Background Art

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

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements for enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), standardization has been carried out on the following technologies: beamforming and massive multiple-input multiple-output (MIMO) for reducing radio wave path loss and increasing radio wave transmission distance in millimeter waves; supporting parameters for dynamic operation of efficient utilization of millimeter wave resources and time slot formats (for example, operating multiple subcarrier spacings); initial access technology for supporting multi-beam transmission and wide frequency bands; definition and operation of bandwidth parts (BWPs); new channel coding methods such as low-density parity-check (LDPC) codes for large-scale 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, with respect to services supported by 5G mobile communication technology, the industry is continuously discussing improvements and performance enhancements on initial 5G mobile communication technology, and has completed physical layer standardization on technologies such as: vehicle-to-everything (V2X) for assisting driving decisions based on information about the location and status of a vehicle sent by a vehicle and for improving user convenience, new radio unlicensed (NR-U) for system operations that comply with various regulatory-related requirements in unlicensed frequency bands, new radio (NR) user equipment (UE) power saving, non-terrestrial network (NTN) as UE satellite direct communication for ensuring coverage in areas where communication with terrestrial networks is not possible, and positioning.

[0005] In addition, the standardization of air interface architecture / protocols for technologies 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 for simplifying the random access process (two-step random access channel (RACH) for NR). At the same time, the standardization of system architecture / services for technologies such as the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined network (SDN) technologies); and mobile edge computing (MEC) for receiving services based on UE location.

[0006] If such a 5G mobile communication system is commercialized, the already exponentially growing number of connected devices will be connected to the communication network, and it is therefore expected that enhanced functions and performance of the 5G mobile communication system and integrated operation of the connected devices will be necessary. To this end, new research on the following technologies is on the agenda: extended reality (XR) for effectively supporting AR, VR, etc. (XR = AR + VR + 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] Furthermore, such developments in 5G mobile communication systems will lay the foundation not only for the development of new waveforms for providing coverage in the terahertz band for 6G mobile communication technology; full-dimensional MIMO (FD-MIMO); multi-antenna transmission technologies (such as array antennas and large antennas); metamaterial-based lenses and antennas for improving the coverage of terahertz band signals; high-dimensional spatial multiplexing technologies using orbital angular momentum (OAM); and reconfigurable smart surfaces (RIS), but will also lay the foundation for the development of full-duplex technologies for improving the frequency efficiency of 6G mobile communication technology and improving system networks; AI-based communication technologies for achieving system optimization from the design stage by leveraging satellites and artificial intelligence (AI) and internalizing end-to-end AI support functions; and next-generation distributed computing technologies for achieving services at a complexity level that exceeds the limits of UE operating capabilities by leveraging ultra-high performance communication and computing resources.

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

[0009] Technical issues

[0010] For the purpose of supporting improved services, the network may configure quality of experience (QoE) measurements for the UE, and thus, the UE performing the measurements may report the QoE measurement results to the network. The related art QoE configuration and measurement have been defined and used for unicast services, but the QoE configuration and measurement may also be applied to multimedia broadcast and multicast service (MBMS) service types.

[0011] Solution to the problem

[0012] Aspects of the present disclosure are to address at least the above-mentioned problems and / or disadvantages and to provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a method and apparatus for performing quality of experience (QoE) measurement configuration and reporting for multimedia broadcast and multicast service (MBMS) broadcast / multicast.

[0013] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0014] According to one aspect of the present disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes: receiving a message from a base station, the message including information for configuring application layer measurement during a terminal being in a radio resource control (RRC) connected state, the information including a configuration for QoE measurement of a multimedia broadcast service (MBS) broadcast; identifying whether the information also includes an indicator configured to indicate that the configuration is applied to at least one of an RRC inactive state and an RRC idle state; and, if the information also includes the indicator, based on the terminal entering at least one of an RRC inactive state or an RRC idle state, using the configuration to perform QoE measurement.

[0015] According to another aspect of the present disclosure, a method performed by a base station in a wireless communication system is provided. The method includes: generating information for configuring application layer measurement for a terminal, the information including a configuration for QoE measurement of MBS broadcast and an indicator configured to indicate that the configuration is applied for at least one of an RRC inactive state and an RRC idle state; and transmitting a message including the information to a terminal in an RRC connected state.

[0016] According to another aspect of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes: a transceiver; and at least one processor, configured to: control the transceiver to receive a message from a base station, the message including information for configuring application layer measurement when the terminal is in an RRC connected state, the information including a configuration for QoE measurement of MBS broadcast; control the transceiver to identify whether the information also includes an indicator configured to indicate that the configuration is applied to at least one of an RRC inactive state and an RRC idle state; and in the case where the information also includes the indicator, based on the terminal entering at least one of an RRC inactive state or an RRC idle state, use the configuration to perform QoE measurement.

[0017] According to another aspect of the present disclosure, a base station in a wireless communication system is provided. The base station includes: a transceiver; and at least one processor configured to: generate information for configuring application layer measurement for a terminal, the information including a configuration for QoE measurement of MBS broadcast and an indicator configured to indicate that the configuration is applied for at least one of an RRC inactive state and an RRC idle state; and control the transceiver to transmit a message including the information to a terminal in an RRC connected state.

[0018] Advantageous Effects of the Invention

[0019] According to the embodiments of the present disclosure, there is an effect of supporting QoE measurement and reporting for MBMS service by providing appropriate configuration information according to the capability of UE, each MBMS service type, each MBMS session, etc.

[0020] Those skilled in the art will become aware of other aspects, advantages, and salient features of the disclosure from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which: Figure 1 is a diagram showing a structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure; Figure 2 is a diagram showing a radio protocol structure of an LTE system according to an embodiment of the present disclosure; Figure 3 is a diagram showing a structure of a next generation mobile communication system according to an embodiment of the present disclosure; Figure 4 is a diagram showing a radio protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure; Figure 5is a flow chart illustrating a process for configuring / reporting signaling-based Quality of Experience (QoE) measurements according to an embodiment of the present disclosure; Figure 6 is a flow chart illustrating a process for configuring / reporting management-based QoE measurements according to an embodiment of the present disclosure; Figure 7 is an embodiment showing a transmission / reception process performed between a base station and a user equipment (UE) to support a multimedia broadcast service (MBS) broadcast in NR according to an embodiment of the present disclosure; Figure 8 is a diagram showing an idea of ​​activating or deactivating QoE measurement or reporting for each MBS session according to an embodiment of the present disclosure; Fig. 9 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure; Fig.10 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure; Fig.11 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure; Fig.12 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure; Fig.13 is a block diagram showing an internal structure of a UE according to an embodiment of the present disclosure; and Fig.14 is a block diagram showing a configuration of a New Radio (NR) base station according to an embodiment of the present disclosure.

[0022] The same reference numerals are used throughout the drawings to denote the same elements. DETAILED DESCRIPTION

[0023] The following description is provided with reference to the accompanying drawings to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. The following description includes various specific details that are helpful for understanding, but these should be considered as exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0024] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and is not intended to limit the present disclosure as defined by the appended claims and their equivalents.

[0025] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0026] In the following description of the present disclosure, when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear, a detailed description of known functions or configurations incorporated herein will be omitted. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0027] In the following description, for convenience, 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 having equivalent technical meanings may be used.

[0028] In the following description, the terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard will be used for ease of description. However, the present disclosure is not limited to these terms and names, and can be applied to systems conforming to other standards in the same manner. In the present disclosure, the term "eNB" may be used interchangeably with the term "gNB". For example, a base station described as an "eNB" may indicate a "gNB".

[0029] Figure 1 is a diagram showing a structure of an LTE system according to an embodiment of the present disclosure.

[0030] refer to Figure 1 , the radio access network of the LTE system consists of next generation base stations (evolved Node B, hereinafter referred to as ENB, Node B or base station) 1a-05, 1a-10, 1a-15 and 1a-20, mobility management entity (MME) 1a-25 and serving gateway (S-GW) 1a-30. User equipment (hereinafter referred to as UE or terminal) 1a-35 accesses the external network through ENB 1a-05 to 1a-20 and S-GW 1a-30.

[0031] refer to Figure 1, ENB 1a-05 to 1a-20 correspond to the existing Node B in the Universal Mobile Telecommunications System (UMTS) system. The ENB is connected to the UE 1a-35 through a radio channel and plays a more complex role than the existing Node B. In the Long Term Evolution (LTE) system, since all user services, including real-time services such as IP (VoIP) over the Internet Protocol, can be served through a shared channel, a device for scheduling by collecting status information such as the buffer status of the UE, the available transmission power status, the channel status, etc. is required, and the ENB 1a-05 to 1a-20 are responsible for this. One ENB generally controls multiple cells. For example, in order to implement a transmission rate of 100 Mbps, the LTE system uses, for example, orthogonal frequency division multiplexing (hereinafter referred to as "OFDM") in a 20 MHz bandwidth as a radio access technology. In addition, an adaptive modulation and coding (hereinafter referred to as AMC) scheme that determines a modulation scheme and a channel coding rate based on the channel state of the UE is applied.

[0032] The S-GW 1a-30 is a device that provides a data bearer, and generates or removes a data bearer under the control of the MME 1a-25. The MME is a device in charge of various control functions and a mobility management function of the UE, and is connected to a plurality of base stations.

[0033] Figure 2 is a diagram showing a radio protocol structure of an LTE system according to an embodiment of the present disclosure.

[0034] refer to Figure 2 , the radio protocols of the LTE system include Packet Data Convergence Protocol (PDCP) 1b-05 and 1b-40, Radio Link Control (RLC) 1b-10 and 1b-35, and Medium Access Control (MAC) 1b-15 and 1b-30 in UE and eNB respectively. Packet Data Convergence Protocol (PDCP) 1b-05 or 1b-40 is responsible for IP header compression / decompression operations, etc. The main functions of PDCP are summarized as follows: - Header compression and decompression (ROHC only) - Transmission of user data; - In-sequence delivery of upper layer PDUs during PDCP re-establishment for RLC AM; - For split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception; - For RLC AM, repeat detection of lower layer SDUs during PDCP re-establishment; - For RLC AM, PDCP SDUs are retransmitted at handover and for distributed bearers in DC, PDCP PDUs are retransmitted during PDCP data recovery procedure; - encryption and decryption; and - Timer based SDU discard in uplink.

[0035] Radio Link Control (hereinafter referred to as RLC) 1b-10 and 1b-35 performs ARQ operations by configuring PDCP packet data units (PDUs) to an appropriate size. The main functions of RLC are summarized as follows: - Transmission of upper layer PDU; - Error correction via ARQ (for AM data transmission only); - Concatenation, segmentation and reassembly of RLC SDUs (for UM and AM data transport only); - Re-segmentation of RLC data PDU (only for AM data transmission); - Reordering of RLC data PDUs (only for UM and AM data transmission); - Duplicate detection (only for UM and AM data transmission); - Protocol error detection (only for AM data transmission); - RLC SDU discard (for UM and AM data transmission only); and - RLC reconstruction.

[0036] MAC 1b-15 and 1b-30 are connected with several RLC layers configured in one UE, and perform operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows.

[0037] - Mapping between logical channels and transport channels; - Multiplexing MAC SDUs belonging to one or different logical channels into transport blocks (TBs) delivered to the physical layer on transport channels / demultiplexing MAC SDUs belonging to one or different logical channels from TBs delivered from the physical layer on transport channels; - Dispatch information report; - Error correction via HARQ; - Priority handling between logical channels of a UE; - Priority handling between UEs with the help of dynamic scheduling; - MBMS service identifier; - Transmission format selection; and - Padding.

[0038] The physical layers 1b-20 and 1b-25 channel-code and modulate the upper layer data, make OFDM symbols and transmit the OFDM symbols through a radio channel, or demodulate and channel-decode OFDM symbols received through a radio channel and transmit them to the upper layer.

[0039] Figure 3 is a diagram showing a structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0040] refer to Figure 3 , a radio access network of a next generation mobile communication system (hereinafter referred to as NR or 5G) includes a next generation base station (new radio node B, hereinafter referred to as NR gNB or NR base station) 1c-10 and NR CN 1c-05. A new radio user equipment (hereinafter referred to as NR UE or terminal) 1c-15 accesses an external network outside a network area 1c-20 through the NR gNB 1c-10 and the NR CN 1c-05.

[0041] refer to Figure 3 , NR gNB 1c-10 corresponds to the evolved Node B (eNB) of the existing LTE system. NR gNB is connected to UE 1c-15 through a radio channel and can provide better services than the existing Node B. In the next generation mobile communication system, since all user services are served by sharing channels, a device for scheduling by collecting status information such as the buffer status of the UE, the available transmission power status, the channel status, etc. is required, and NR NB 1c-10 is responsible for this. One NR gNB usually controls multiple cells. Compared with the current LTE, a bandwidth greater than or equal to the existing maximum bandwidth can be applied in order to implement ultra-high-speed data transmission, and an additional beamforming technology can be grafted by using orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a radio access technology. In addition, an adaptive modulation and coding (hereinafter referred to as AMC) scheme for determining the modulation scheme and channel coding rate according to the channel status of the UE is applied.

[0042] NR CN 1c-05 performs functions such as mobility support, bearer configuration, QoS configuration, etc. NR CN is a device responsible for various control functions and mobility management functions of UE, and is connected to multiple base stations. In addition, the next generation mobile communication system can be linked with the existing LTE system, and NR CN is connected to MME 1c-25 through a network interface. MME is connected to the existing base station eNB 1c-30.

[0043] Figure 4 is a diagram showing a radio protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0044] refer to Figure 4 , the radio protocols of the next generation mobile communication system include NR Service Data Adaptation Protocol (SDAP) 1d-01 and 1d-45, NR PDCP 1d-05 and 1d-40, NR RLC 1d-10 and 1d-35, and NR MAC 1d-15 and 1d-30 in UE and NR base station, respectively.

[0045] The main functions of NR SDAP 1d-01 and 1d-45 may include some of the following functions: - Transmission of user plane data; - Mapping between QoS flows and DRBs for both DL and UL; - marking the QoS Flow ID in both DL and UL packets; and - Reflective QoS Flow to DRB mapping for UL SDAP PDU.

[0046] Regarding the SDAP layer, the UE can be configured through a radio resource control (RRC) message to use the SDAP layer header or the SDAP layer function for each PDCP layer, each bearer or each logical channel, and when the SDAP header is configured, the UE can indicate the UE to update or reconfigure the mapping information of the uplink and downlink QoS flows and data bearers through the non-access layer (NAS) QoS reflection configuration 1a bit indicator (NAS reflective QoS) and access layer (AS) QoS reflection configuration 1a bit indicator (AS reflective QoS) of the SDAP header. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority, scheduling information, etc. to support smooth services.

[0047] The main functions of NR PDCP 1d-05 and 1d-40 may include some of the following functions: - Header compression and decompression (ROHC only) - Transmission of user data; - In-sequence delivery of upper layer PDUs; - Out-of-order delivery of upper layer PDUs; - PDCP PDU reordering for reception; - Duplicate detection of lower layer SDUs; - Retransmission of PDCP SDU; - encryption and decryption; and - Timer based SDU discard in uplink.

[0048] In the above description, the reordering function of the NR PDCP device may refer to a function of reordering the PDCP PDU received from the lower layer based on the PDCP sequence number (SN), and may include a function of transmitting data to the upper layer in the rearranged order, or a function of directly transmitting data regardless of the order, a function of recording lost PDCP PDUs by reordering, a function of reporting the status of lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of lost PDCP PDUs.

[0049] The main functions of NR RLC 1d-10 and 1d-35 may include some of the following functions: - Transmission of upper layer PDU; - In-sequence delivery of upper layer PDUs; - Out-of-order delivery of upper layer PDUs; - Error correction via ARQ; - Concatenation, segmentation and reassembly of RLC SDUs; - Re-segmentation of RLC data PDUs; - Reordering of RLC data PDUs; - Repeat testing; - Protocol error detection; - RLC SDU discard; and - RLC reconstruction.

[0050] In the above description, the in-sequence delivery of NR RLC refers to the function of delivering the RLC SDU received from the lower layer to the upper layer in sequence, which may include the function of reassembling and delivering the divided RLC SDUs when one RLC SDU is initially divided into several RLC SDUs and received, and may include the function of rearranging the received RLC PDUs based on the RLC sequence number (SN) or the PDCP sequence number (SN), the function of reordering and recording the lost RLC PDUs, and the function of reporting the status of the lost RLC PDUs to the transmitting side; the function of requesting retransmission of the lost RLC PDUs, and the function of delivering only the RLC SDUs before the lost RLC SDUs in sequence to the upper layer when there are lost RLC SDUs, or may include the function of delivering all RLC SDUs received before the start of the timer in sequence to the upper layer even if there are lost RLC SDUs, if a predetermined timer expires, or may include the function of delivering all RLC SDUs received so far in sequence to the upper layer even if there are lost RLC SDUs, if a predetermined timer expires. In addition, in the above, the RLC PDUs may be processed in the order in which they are received (regardless of the sequence number order and the sequence number, in the order of arrival) and delivered to the PDCP device out of order (out-of-order delivery), and in the case of segmentation, the segments stored in the buffer or received later are received, reconstructed into a complete RLC PDU, processed and transmitted to the PDCP device. The NR RLC layer may not include the cascading function, and the function may be performed by the NR MAC layer or replaced by the multiplexing function of the NR MAC layer.

[0051] In the above description, the out-of-order delivery of the NR RLC device refers to the function of directly delivering the RLC SDU received from the lower layer to the upper layer regardless of the order, and may include the function of reassembling and delivering when one RLC SDU is initially divided into several RLC SDUs and received, and the function of storing the RLC SN or PDCP SN of the received RLC PDU, sorting and recording the lost RLC PDU.

[0052] NR MAC 1d-15 and 1d-30 can be connected to several NR RLC layers configured in one UE, and the main functions of NR MAC may include some of the following functions.

[0053] - Mapping between logical channels and transport channels; - Multiplexing / demultiplexing of MAC SDU; - Dispatch information report; - Error correction via HARQ; - Priority handling between logical channels of a UE; - Priority handling between UEs with the help of dynamic scheduling; - MBMS service identifier; - Transmission format selection; and - Padding.

[0054] NR PHY layers 1d-20 and 1d-25 can channel encode and modulate upper layer data, create OFDM symbols and transmit the OFDM symbols through a radio channel, or can demodulate and channel decode OFDM symbols received through a radio channel and transmit them to an upper layer.

[0055] Figure 5 is a flow chart illustrating a process for configuring / reporting signaling-based QoE measurements according to an embodiment of the present disclosure.

[0056] refer to Figure 5 In operation 1e-10, the UE access layer (AS) 1e-05 may store information indicating which quality of experience (QoE) measurement is supported by application layer measurement in a UE capability information message (UECapabilityInformation) and transmit it to the base station 1e-15. Additionally, the message may include capability information about whether the UE AS 1e-05 can divide and transmit an RRC message (MeasurementReportAppLayer) reporting the QoE measurement result to the base station 1e-15. For example, the UE capability information message may include parameters as shown in Table 1 below.

[0057]

Table 1

[0058] Additionally, the UE capability information message may include information about whether the UE supports QoE measurement through application layer measurement for multimedia broadcast multicast service (MBMS), extended reality (XR), and the like. In this case, whether the QoE measurement is supported may be stored separately in the UE capability information message for each of the multimedia broadcast service and the multimedia multicast service, or may be stored together in the UE capability information message without distinguishing between the multimedia broadcast service and the multimedia multicast service. Additionally, whether the QoE measurement of the multimedia broadcast service is supported may be included in the message according to the RRC state. As an example, the QoE measurement of the multimedia broadcast service may be supported only in the RRC connected mode (RRC_Connected), or the QoE measurement of the multimedia playback service may be supported only in the RRC idle mode (RRC_Idle) and the RRC inactive mode (RRC_Inactive), or the QoE measurement of the multimedia playback service may be supported regardless of the RRC state.

[0059] In operation 1e-30, operations administration and maintenance (OAM) 1e-20 may provide QoE measurement configuration information to a core network (CN) 1e-25.

[0060] In operation 1e-35, the CN 1e-25 may activate the QoE measurement by transmitting the QoE measurement configuration information received in operation 1e-30 to the base station 1e-15.

[0061] In operation 1e-40, the base station 1e-15 may store the QoE measurement configuration information received in operation 1e-35 in a predetermined RRC message (eg, RRCReconfiguration or RRCResume) and transmit it to the UE AS 1e-05. The QoE measurement configuration information (AppLayerMeasConfig) stored in the predetermined RRC message may include parameters as shown in Table 2 below.

[0062]

Table 2

[0063] Additionally, AppLayerMeasConfig may also include QoE measurement configuration information for multimedia broadcast services. As an example, the multimedia broadcast service may be indicated in the serviceType included in AppLayerMeasConfig, or the QoE measurement configuration information for the multimedia broadcast service may be included by introducing a separate indicator, or an indicator (e.g., mbs-SessionList) may be included as to whether the QoE of each MBS session is measured. The QoE measurement configuration information for the multimedia broadcast service may be applied to all RRC states (RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED) of the UE, or may be applied to at least one RRC state. For example, it may be indicated in AppLayerMeasConFig which RRC states (any combination of RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED) the QoE measurement configuration information for the multimedia broadcast service applies to. Alternatively, a new timer value may be included to represent the QoE measurement execution period for the multimedia broadcast service. For example, when a new timer value is included, the UE may drive or re-drive the new timer with the new timer value received when receiving AppLayerMeasConfig from the base station, or may drive or re-drive the new timer with the new timer value received when transitioning to RRC idle mode or RRC inactive mode. When the driven new timer expires, the UE may release the QoE measurement configuration information for the multimedia broadcast service. For reference, the UE AS receiving AppLayerMeasConfig may perform the following process.

[0064]

Table 3

[0065] In operation 1e-50, the UE AS 1e-05 that receives the AppLayerMeasConfig may deliver the configuration information to the application layer (UE APP) 1e-45 of the UE through an AT command.

[0066] In operation 1e-55, the UE APP 1e-45 may perform QoE measurement according to the configuration information received in operation 1e-50, and report the measurement result to the UE AS 1e-05 through an AT command according to the configuration information.

[0067] In operation 1e-60, UE AS 1e-05 may report the measurement result to base station 1e-15 through a predetermined RRC message (eg, MeasReportAppLayer) based on the information received in operation 1e-55. In order to report the QoE measurement result, a signaling radio bearer (SRB) 4 may be used. The predetermined RRC message may include parameters as shown in Table 4 below.

[0068]

Table 4

[0069] As an example, UE As 1e-05 may transmit a predetermined RRC message including a QoE measurement result report to base station 1e-15 based on the process in Table 5 below.

[0070]

Table 5

[0071] In operation 1e-70, the base station 1e-15 may send the measurement result report received in operation 1e-60 to the configured final destination (TCE or MCE) 1e-65.

[0072] Figure 6 is a flow chart illustrating a process for configuring / reporting management-based QoE measurements according to an embodiment of the present disclosure.

[0073] refer to Figure 6 , the management-based QoE configuration / reporting process is basically similar to the signaling-based process ( Figure 5 ). Therefore, in this specification, only the differences from the management-based approach are described below, and other processes and descriptions can be considered the same as Figure 5 The process is the same as described in .

[0074] In the management-based approach, in operation 1f-15, OAM 1f-05 may transmit a QoE measurement configuration directly to base station 1f-10 without activating QoE measurement through CN. After receiving the configuration, base station 1f-10 searches for a single UE or multiple UEs that meet various conditions (e.g., area scope, application layer capabilities, and service types). In operation 1f-20, base station 1f-10 may deliver the QoE measurement configuration to each of the UEs through an RRC message (e.g., RRCReconfiguration or RRCResume). Other processes and message types may be considered similar to Figure 5 The description of (signaling-based method) is the same.

[0075] Figure 72 is an embodiment showing a transmission / reception process performed between a base station and a UE to support MBS broadcasting in NR according to an embodiment of the present disclosure.

[0076] refer to Figure 7 , in operation 1g-15, UE 1g-10 in RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE) may camp on a cell or base station 1g-05 providing SIB 20 to receive SIB 20. A connected mode (RRC_CONNECTED) UE may also receive SIB 20. SIB 20 may include information required for the UE to obtain MBS control channel (MCCH) information required for MBS (multicast / broadcast service) broadcast reception. Here, MCCH means as follows: a point-to-multipoint downlink channel used to transmit MBS broadcast control information associated with one or more MTCHs from the network to the UE.

[0077] The ASN.1 format of SIBx may be as shown in Table 6.

[0078]

Table 6

[0079] In operation 1g-20, when the UE 1g-10 supporting MBS wants to receive MBS broadcast (or the UE is interested in MBS broadcast) or the UE is receiving MBS broadcast service, the UE can obtain the MBSBroadcastConfiguration message on the MCCH after entering the cell providing SIB 20 or receiving the update notification of MCCH information. Specifically, the above content can be described as in the process in Table 7 below.

[0080]

Table 7

[0081] For reference, the specific process for updating MCCG information may be shown in Table 8 below.

[0082]

Table 8

[0083] The ASN.1 format of the MBSBroadcastConfiguration message may be as shown in Table 9.

[0084]

Table 9

[0085] The mbs-sessionInfoList parameter shown above may include information about multiple MBS sessions currently being served in the cell, and the ASN.1 format of the parameter may be as shown in Table 10.

[0086]

Table 10

[0087] Each MBS session can be distinguished by an MBS session ID (mbs-SessionId) called a temporary mobile group identity (TMGI), and the TMGI can include an operator's public land mobile network (PLMN) ID and a service ID distinguished within the PLMN. g-RNTI (group RNTI) can refer to a radio network temporary identifier (RNTI) that scrambles MTCH transmission and scheduling information.

[0088] In operation 1g-25, UE 1g-10 may perform a broadcast MBS radio bearer (MRB) establishment in order to receive the MBS broadcast session of interest. This execution may be initiated for the following reasons: at the start of an MBS session; upon entering a cell providing an MBS broadcast service of interest to the UE; upon becoming interested in an MBS broadcast service; upon removing a UE capability limitation that prevents reception of an MBS broadcast service of interest to the UE.

[0089] The specific process of operating 1g-25 can be shown in Table 11.

[0090]

Table 11

[0091] In operation 1g-30, UE 1g-10 receives MBS broadcast data through an MBS traffic channel (MTCH). MTCH refers to a point-to-multipoint downlink channel for transmitting MBS data of a multicast session or a broadcast session from a network to a UE.

[0092] To receive MTCH, UE 1g-10 may decode the Physical Downlink Control Channel (PDCCH) scrambled with a g-RNTI (Group RNTI). The g-RNTI required for PDCCH decoding may be provided via the MBS-SessionInfoList IE in the MBSBroadcastConfiguration message in the form of a list of multiple g-RNTIs, one g-RNTI per MBS broadcast session (i.e., per mbs-SessionId or per Temporary Mobile Group Identity (TMGI)).

[0093] In operation 1g-35, UE 1g-10 may configure an RRC connection with base station 1g-05 and transition to a connected mode. Alternatively, UE 1g-10 may already be in a connected mode without the process of operation 1g-35.

[0094] In operation 1g-40, UE 1g-10 may receive SIB 21. SIB 21 may include a mapping of frequency and MBS service, and the ASN.1 format may be as shown in Table 12.

[0095]

Table 12

[0096] The presence of SIB 21 implicitly enables reporting of the MBSInterestIndication message shown below. The absence of SIB 21 implicitly disables reporting of the MBSInterestIndication message shown below. The order of operations 1g-35 and 1g-40 may be reversed.

[0097] In operation 1g-45, the UE 1g-10 in the connected mode supporting MBS may transmit an MBSInterestIndication message to inform the base station 1g-05 of the MBS broadcast service and related frequencies that the UE 1g-10 is receiving or interested in. In addition, the MBSInterestIndication message may be transmitted to transmit priority information of the MBS broadcast relative to the unicast. The ASN.1 format of the MBSInterestIndication message may be as shown in Table 13.

[0098]

Table 13

[0099] The MBSInterestIndication message may be configured and transmitted according to the procedure in Table 14 below.

[0100]

Table 14

[0101] In operation 1g-50, UE 1g-10 may perform a broadcast MRB release to stop receiving MBS broadcasts. Alternatively, a broadcast MRB release may be performed in the following cases: When the MBS session is stopped; when leaving the cell broadcasting the MBS service of interest to the UE; when losing interest in the MBS service; when capability limitations begin to prevent reception of the service in question. Specifically, the broadcast MBS release procedure may be as shown in Table 15.

[0102]

Table 15

[0103] Figure 8 is a diagram illustrating an idea of ​​activating or deactivating QoE measurement or reporting for each MBS session according to an embodiment of the present disclosure.

[0104] refer to Figure 8 , the OAM or base station can configure the UE's QoE measurements for MBS services. However, multiple MBS (broadcast) sessions can coexist in a base station or cell. In this case, the OAM or base station may want to support QoE measurements only for specific sessions. For example, in operation 1h-05, the base station provides services for a total of 4 MBS sessions. However, from the UE's perspective, performing QoE measurements for all MBS sessions and generating and transmitting QoE measurement result reports may be heavy in terms of resources and energy consumption. In addition, from the OAM or base station's perspective, receiving QoE reports for all MBS sessions from the UE and processing them may be heavy in terms of computation / processing and resource management. In addition, from the OAM or base station's perspective, there may be MBS sessions (for example, Figure 8 1 and 3 in the QoE report), and there may be MBS sessions that do not want to receive QoE reports (e.g. Figure 8 For example, the base station may want to enable UE's QoE measurement and reporting for MBS sessions that require high quality of service or where many users are receiving services, and may want to disable UE's QoE measurement and reporting for MBS sessions that require low service or where a small number of UEs are receiving services.

[0105] Therefore, in operations 1h-10, the OAM or the base station may activate QoE measurement or reporting only for sessions 1 and 3, and deactivate QoE measurement or reporting for sessions 2 and 4.

[0106] To implement the above idea, the UE may report to the base station whether the QoE measurement of each MBS session is supported. The indicator may be defined in a UECapability message and reported to the base station.

[0107] In order to realize the above idea, an indicator indicating whether to activate QoE measurement (or application layer measurement) for each MBS session can be added through MBSBroadcastConfiguration, system information message or other newly defined broadcast messages. When the indicator is defined in the MBSBroadcastConfiguration message, the indicator (e.g., appLayerSupport) can be included for each MBS-SessionInfo in the MBSBroadcastConfiguration message, as shown in Table 16.

[0108]

Table 16

[0109] In this case, the TMGI or g-RNTI delivered with the indicator (e.g., within the same MBSSessionInfo) may be used to indicate a specific MBS session, and the QoE measurement or reporting of the corresponding MBS session may be activated or deactivated by the indicator. As an example, the indicator may be defined as "ENUMERATED {enabled, disabled}". The indicator may be included as an optional IE. In this case, a base station supporting QoE measurement (or a base station supporting QoE measurement for MBS, or a base station supporting QoE measurement for each session) may include the indicator, and configure the indicator as true or enabled for the session for which QoE measurement is to be activated, or configure the indicator as false or disabled for the session for which QoE measurement is to be deactivated. A base station that does not support QoE measurement (or a base station that does not support QoE measurement for MBS, or a base station that does not support QoE measurement for each session) may not include the indicator. Of course, the indicator may also be defined as "ENUMERATED {enabled}".

[0110] The radio resource control (RRC) layer or access stratum (AS) layer of the UE that receives the indicator may deliver the indicator to the APP layer (option 1). After establishing the broadcast MRB, the UE may transmit the corresponding TMGI value to the higher layer (or APP layer), and in this case, the indicator (e.g., appLayerSupport) may be transmitted together or separately. The process related to this may be as shown in Table 17 below.

[0111]

Table 17

[0112] Alternatively, the indicator may be delivered to the APP layer together with the corresponding g-RNTI value instead of the TMGI. The RRC layer may define or use an existing or new AT command to deliver the indicator or TMGI or g-RNTI to the APP layer. The APP layer of the UE that receives the indicator may apply and use the indicator for the MBS session corresponding to the TMGI (or g-RNTI) received together. If the indicator is configured as true or enabled or presented, the APP layer of the UE may perform QoE measurements and generate QoE measurement reports only for the MBS sessions configured with the indicator. As another embodiment of the present disclosure, the UE APP layer may always perform QoE measurements and generate QoE measurement reports for all MBS sessions, but may only deliver the QoE measurement report to the AS layer for the MBS sessions to which the indicator is applied. As another embodiment of the present disclosure, the UE APP layer may always perform QoE measurements for all MBS sessions, but may only generate and deliver the QoE measurement report to the AS layer for the MBS sessions to which the indicator is applied. On the contrary, if the indicator is configured as false or disabled or does not exist, the UE APP layer may not perform QoE measurement and generate QoE measurement reports for the MBS sessions to which the indicator is applied. As another embodiment of the present disclosure, the UE APP layer may always perform QoE measurement and generate QoE measurement reports for all MBS sessions, but may not deliver the QoE measurement report to the AS layer only for the MBS sessions to which the indicator is applied. As another embodiment of the present disclosure, the UE APP layer may always perform QoE measurement for all MBS sessions, but may not generate QoE measurement reports only for the MBS sessions to which the indicator is applied.

[0113] As another embodiment of the present disclosure, the UE AS layer may filter the QoE measurement result report received from the APP layer based on the indicator without delivering the indicator to the APP layer (option 2). For example, when receiving the QoE measurement result report of the APP layer, the AS layer of the UE may determine which MBS session generated the report. To this end, the UE AS layer may receive a TMGI or g-RNTI indicating a specific MBS session and a QoE measurement result report from the APP layer. If the indicator (e.g., appLayerSupport) received by the UE AS layer from the base station is configured as true or enabled or presented, the UE AS layer may only deliver the QoE measurement report (received from the APP layer) generated by the corresponding MBS session to the base station. If the indicator (e.g., appLayerSupport) received by the UE AS layer from the base station is configured as false or disabled or does not exist, even if the QoE measurement report generated by the corresponding MBS session is received from the APP layer, the UE AS layer may not forward the QoE measurement report to the base station or discard it.

[0114] As another embodiment of the present disclosure, an indicator as to whether to measure the QoE of each MBS session may be used in a broadcast message as well as a dedicated message (transmitted for each UE). When used in a broadcast message as described above, the indicator may be commonly applied to all UEs for each MBS session, but when a dedicated message is used, it may be configured differently for each MBS session and also for each UE. For example, the OAM or base station may simultaneously configure the QoE measurement or report of MBS session 1 and MBS session 3 of UE 1 and the QoE measurement or report of MBS session 2 and MBS session 3 of UE 2. The QoE configuration information may be included in an RRCReconfiguration message or an RRCResume message (i.e., a dedicated message) in the format of AppLayerMeasConFig. Together with the QoE configuration information, an indicator as to whether to measure the QoE of each MBS session may be delivered as shown in Table 18 below.

[0115]

Table 18

[0116] AppLayerMeasConfig may include multiple MeasConfigAppLayer (QoE configuration information). For each MeasConfigAppLayer, a QoE configuration information ID (measConfigAppLayerId), APP layer QoE configuration information (measConfigAppLayerContainer), and a service type (serviceType) of the QoE configuration may be included. As described above, MBS may be additionally defined in the serviceType. Alternatively, MBS broadcast and MBS multicast may be defined separately as serviceType. When the serviceType is configured as MBS or MBS broadcast, the base station supports QoE measurement, the base station supports QoE measurement for MBS, or the base station supports QoE measurement for each MBS session, an indicator (e.g., mbs-SessionList) as to whether QoE is measured for each MBS session may be included in the MeasConfigAppLayer. The indicator may consist of multiple TMGIs or g-RNTIs to indicate multiple MBS sessions that require QoE measurement. The UE may perform QoE measurement or reporting on the MBS sessions included in the corresponding list. Conversely, the UE may not perform QoE measurement or reporting for MBS sessions not included in the corresponding list. In this case, the method of Option 1 or Option 2 may be used. When the serviceType is not MBS or MBS broadcast, the base station does not support QoE measurement, the base station does not support QoE measurement for MBS, or the base station does not support QoE measurement for each session, the corresponding indicator may not exist.

[0117] The MBS QoE configuration information of the RRC_inactive or RRC_idle UE may be included in a dedicated RRC message (e.g., RRCRelease, a newly defined message) and transmitted, and in this case, an indicator may be included. The UE AS layer that receives the indicator may deliver the indicator to the APP layer, as in Option 1 above, and the APP layer may activate / deactivate the QoE measurement or report for each MBS session. Alternatively, similar to Option 2 above, the UE AS layer itself may filter the measurement report for each MBS session and forward it to the base station or not forward it (the measurement report may be discarded).

[0118] As another embodiment of the present disclosure, the OAM may include an indicator (e.g., mbs-SessionList) about whether to measure the QoE of each MBS session in the APP layer QoE configuration information (e.g., measConfigAppLayerContainer) and transmit it to the UE. For example, when the OAM generates the APP layer QoE configuration information of the MBS service, the indicator may be included. For example, when the OAM knows the MBS session ID (TMGI or g-RNTI) (e.g., through communication with an object of the MBS service (such as MB-SMF)) and generates the APP layer QoE configuration information of the MBS, the QoE measurement or report may be activated or deactivated for each MBS session ID. The UE APP layer that receives the APP layer QoE configuration information including the indicator may perform QoE measurement or generate a report only for the MBS session indicated as active, and may not perform QoE measurement or generate or transmit a report for the MBS session indicated as inactive.

[0119] When a QoE measurement result report is generated in the UE APP layer and transmitted to the UE AS layer, a TMGI or g-RNTI may be delivered together for each QoE report to indicate which MBS session the report is for. In this case, a new AT command or an AT command of a related technology may be used. After receiving the (TMGI or g-RNTI), the UE AS layer may include the received TMGI or g-RNTI when transmitting the QoE measurement result report to the base station through the MeasurementReportAppLayer message.

[0120] The UE may include the TMGI or g-RNTI in the MeasurementReportAppLayer-r17-IEs when some or all of the following conditions are met: - When the UE supports QoE measurement or reporting; - When the UE supports MBS QoE measurement or reporting; - When the UE supports QoE measurement or reporting per MBS session; - When the serviceType of MeasurementReportAppLayer-r17-IEs is MBS or MBS broadcast; - When the base station supports QoE measurement or configuration for each MBS session; - When the base station supports QoE measurement or configuration for MBS; and - When the base station allows QoE measurement for each MBS session.

[0121] One MeasurementReportAppLayer-r17-IEs may include QoE measurement result reports of multiple MBS sessions, and therefore, may define or include multiple MBMS session IDs (TMGI or g-RNTI).

[0122] The UE AS layer can report the QoE measurement results and the corresponding MBS session ID (TMGI or g-RNTI) to the base station through the following message instead of the MeasurementReportAppLayer message: - MBSInterestIndication; - UEInformationResponse; and -UEAssistanceInformation.

[0123] Unlike the above method (a method of specifying the MBS session ID (TMGI or g-RNTI) corresponding to each QoE measurement result report as an RRC parameter in the AS layer), the corresponding MBS session ID (TMGI or g-RNTI) may be defined and specified in an APP layer QoE measurement data report (e.g., measurementReportAppLayerContainer). QoE measurement result reports of multiple MBS sessions may be included in one APP layer QoE measurement result report (e.g., measurementReportAppLayerContainer), and therefore, multiple MBS session IDs (TMGI or g-RNTI) may be defined or included.

[0124] The QoE measurement of the related art is defined and used only for unicast services (streaming, MTSI, VR). However, if MBS is introduced as a service type, an indicator for distinguishing whether it is a QoE configuration (or report) for MBS multicast or a QoE configuration (or report) for MBS broadcast may be introduced. When the serviceType is MBS, the base station may include an indicator (e.g., serviceCategory), and may indicate whether the QoE configuration is for MBS multicast or MBS broadcast. When the serviceType is MBS and the indicator does not exist, this may refer to a QoE configuration for both MBS multicast and broadcast. Alternatively, it is defined as ENUMERATED {multicast, broadcast, both}, and "both" may indicate a QoE configuration that is generally applied to both MBS multicast and broadcast. When the indicator does not exist, it may refer to a QoE measurement configuration for unicast services. Alternatively, as defined by ENUMERATED {unicast, multicast, broadcast}, for service types other than MBS, unicast may be indicated, and in the case of MBS, multicast or broadcast may be indicated. The indicator may be delivered to the APP layer, and the APP layer may (or may not) perform QoE measurement for each broadcast based on the indicator, or may (or may not) generate a QoE measurement report. The correspondingly generated QoE measurement report may also indicate the QoE measurement result of the broadcast, as follows.

[0125] The QoE measurement result report generated by the UE APP layer can be transmitted to the AS layer and stored. The QoE measurement result report in the connected mode, inactive mode or idle mode can be stored in the AS layer. However, the memory size in the AS layer for storing the QoE measurement result report may be limited. When the UE's memory is full, if the QoE measurement result report is additionally generated and delivered to the AS layer, the UE AS layer may discard a partial or oversized QoE measurement report. To this end, the OAM, CN or base station may configure a priority for storing the QoE measurement report with the QoE configuration information. For example, it may be indicated that the QoE measurement result report of the MBS service type is regarded as a higher or lower priority than the QoS measurement result report of other service types (e.g., mbsPriorityOverUnicast). When serviceType is MBS, an indicator may be included. When the indicator is not present, it may mean that all service types have the same priority. Alternatively, a priority (e.g., priority) may be indicated for each QoE configuration (e.g., MeasConfigAppLayer). When the UE's memory is full, the UE may discard reports generated for QoE measurement configurations with low (lowest) priority.

[0126] Fig. 9 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure.

[0127] refer to Fig. 9 , in operation 1i-05, UE 1i-01 may be in RRC connection mode (RRC_Connection) by configuring an RRC connection with base station 1i-02.

[0128] In operation 1i-10, UE 1i-01 may transmit a UE capability information message (UECapabilityInformation) to base station 1i-02. The information included in the message may follow the above-mentioned embodiment. As an example, the message may include information indicating that QoE measurement may be performed on a multimedia broadcast service in RRC idle mode (RRC_idle) or RRC inactive mode (RRC_inactive).

[0129] In operation 1i-15, the base station 1i-02 may transmit a predetermined RRC message (e.g., RRCResume or RRCReconfiguration) including configuration information for application layer measurement (AppLayerMeasConfig) to the UE 1i-01. The QoE measurement configuration information for multimedia broadcast services may be included in the AppLayerMeasConFig. The QoE measurement configuration information for multimedia broadcast services may be applied to all RRC states (RRC_idle, RRC_inactive, and RRC_connected). Of course, a separate indicator may be added to apply to RRC_inactive and RRC_idle. Additionally, the QoE measurement configuration information for multimedia broadcast services may include a new timer value. As an example, upon receiving the ApplayerMeasConfig, the UE 1i-01 may drive or redrive a new timer with the received new timer value. Alternatively, the UE 1i-01 may drive or redrive a new timer with a new timer value received when transitioning to RRC idle mode or RRC inactive mode. When the driven timer expires, UE 1i-01 may release the QoE measurement configuration information for the multimedia broadcast service. Of course, the QoE measurement result of the multimedia broadcast service may also be released together.

[0130] In operation 1i-20, the base station 1i-02 may transmit an RRC connection release message (RRCRelease) to the UE 1i-01.

[0131] In operation 1i-25, UE 1i-01 may transition to RRC idle mode (RRC_idle) or RRC inactive mode (RRC_inactive). When the RRC connection release message received in operation 1i-20 includes the suspended configuration information (suspendConfig), UE 1i-01 may transition to RRC inactive mode, otherwise, UE may transition to RRC idle mode.

[0132] In operation 1i-30, UE 1i-01 in RRC idle mode or RRC inactive mode can obtain system information by camping on a suitable cell. In the system information, an indicator indicating whether a UE configured for QoE measurement of a multimedia broadcast service should perform QoE measurement for the multimedia broadcast service can be broadcast. For example, the UE can perform QoE measurement on the multimedia broadcast service only when the indicator is broadcast in the system information. Additionally, in the system information, an indicator can be broadcast separately, indicating whether UE 1i-01 should report to the base station 1i-02 an indicator indicating the presence of QoE measurement result information of the multimedia broadcast service after UE 1i-01 transitions to RRC connected mode. Of course, a single indicator indicating whether QoE measurement should be performed for the multimedia broadcast service and the QoE measurement result information therefor can be broadcast in the system information.

[0133] In operation 1i-35, according to the above embodiment, UE 1i-01 in RRC idle mode or RRC inactive mode can receive multimedia broadcast services.

[0134] In operation 1i-40, UE 1i-01 in the RRC idle mode or the RRC inactive mode may perform application layer measurement on the multimedia broadcast service (ie, QoE measurement on the multimedia broadcast service).

[0135] In operation 1i-45, UE 1i-01 in RRC idle mode or RRC inactive mode can be transformed to RRC connected mode through RRC connection setup or RRC connection recovery process with base station 1i-02. For example, a UE in RRC idle mode can perform an RRC connection configuration process, and a UE in RRC inactive mode can perform an RRC connection recovery process.

[0136] In operation 1i-50, UE 1i-01 in RRC connection mode may transmit an RRC connection setup complete message (RRCSetupComplete) or an RRC connection recovery complete message (RRCResumeComplete) to base station 1i-02. The message may include an indicator of the presence of a QoE measurement value of a multimedia broadcast service. When an indicator for reporting a QoE measurement value of a multimedia broadcast service is present in the system information obtained in operation 1i-30, UE 1i-01 may include an indicator indicating that the QoE measurement value of the multimedia broadcast service is present in the RRC connection setup complete message or the RRC connection recovery complete message. This is to prevent UE 1i-01 from unnecessarily transmitting an indicator of the presence of a QoE measurement value of a multimedia broadcast service to a cell that does not understand the QoE measurement value of the multimedia broadcast service.

[0137] In operation 1i-55, the RRC connected mode UE 1i-01 may transmit a predetermined RRC message (e.g., MeasurementReportAppLayer) containing QoE measurement result information to the base station 1i-02. The RRC message may include QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode. The QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode by a separate indicator or a new IE may be included in the predetermined RRC message to distinguish the QoE measurement result information of the multimedia broadcast service measured in RRC connected mode from the QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode. Of course, as in the above-mentioned embodiments of the present disclosure, the QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode may be included in the UE information response message (UEInformationResponse). For example, this case is limited to the case where the base station includes an indicator for reporting the QoE measurement result information of the multimedia broadcast service in the UE information request message (UEInformationRequest).

[0138] Fig.10 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure.

[0139] refer to Fig.10 , in operation 1j-05, UE 1j-01 can be in RRC connection mode (RRC_connection) by configuring an RRC connection with base station 1j-02.

[0140] In operation 1j-10, UE 1j-01 may transmit a UE capability information message (UECapabilityInformation) to base station 1j-02. The information included in the message may follow the above-mentioned embodiment. As an example, the message may include information indicating that QoE measurement may be performed on a multimedia broadcast service in RRC idle mode (RRC_idle) or RRC inactive mode (RRC_inactive).

[0141] In operation 1j-15, the base station 1j-02 may transmit a predetermined RRC message (e.g., RRCResume or RRCReconfiguration) including configuration information for application layer measurement (AppLayerMeasConfig) to the UE 1j-01. The QoE measurement configuration information for multimedia broadcast services may be included in the AppLayerMeasConFig. The QoE measurement configuration information for multimedia broadcast services may be applied to all RRC states (RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED). Of course, a separate indicator may be added to the AppLayerMeasConfig to apply to RRC_INACTIVE and RRC_IDLE. Additionally, the QoE measurement configuration information for multimedia broadcast services may include a new timer value. As an example, upon receiving the ApplayerMeasConfig, the UE 1j-01 may drive or redrive a new timer with the received new timer value. Alternatively, the UE 1j-01 may drive or redrive a new timer with a new timer value received when transitioning to RRC idle mode or RRC inactive mode. When the driven timer expires, UE 1j-01 may release the QoE measurement configuration information for the multimedia broadcast service. Of course, the QoE measurement result of the multimedia broadcast service may also be released together.

[0142] In operation 1j-20, the base station 1j-02 may transmit an RRC connection release message (RRCRelease) including the suspended configuration information to the UE 1j-01.

[0143] In operation 1j-25, UE 1j-01 may transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0144] In operation 1j-30, UE 1i-01 in RRC inactive mode can obtain system information by camping on a suitable cell. In the system information, an indicator indicating whether UE 1j-01 configured for QoE measurement of multimedia broadcast services should perform QoE measurement for multimedia broadcast services can be broadcast. For example, UE 1j-01 can perform QoE measurement on multimedia broadcast services only when the indicator is broadcast in the system information. Additionally, in the system information, an indicator can be broadcast separately, indicating whether UE 1i-01 should report QoE measurement result information indicating the presence of multimedia broadcast services to base station 1j-02 after UE 1j-01 transitions to RRC connected mode. Of course, a single indicator indicating whether QoE measurement should be performed for multimedia broadcast services and QoE measurement result information therefor can be broadcast in the system information.

[0145] In operation 1j-35, according to the above embodiment, UE 1j-01 in RRC inactive mode can receive multimedia broadcast services.

[0146] In operation 1j-40, UE 1j-01 in RRC inactive mode may perform application layer measurements on the multimedia broadcast service (ie, QoE measurements on the multimedia broadcast service).

[0147] In operation 1j-45, UE 1j-01 in RRC inactive mode can initiate an RRC connection recovery procedure and transmit an RRC connection recovery request message (RRCResumeRequest or RRCResumeRequest1) to the base station 1j-02.

[0148] In operation 1j-50, the base station 1j-02 may transmit an RRC connection resumption message (RRCResume) to the UE 1j-01. The message may include an indicator for reporting a QoE measurement value of the multimedia broadcast service.

[0149] In operation 1j-55, UE 1j-01 may apply the RRC connection recovery message received in step 1j-50 and transition to RRC connection mode.

[0150] In operation 1j-60, UE 1j-01 may transmit an RRC connection recovery complete message (RRCResumeComplete) to base station 1j-02. The message may include QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode. For example, when the RRC connection recovery message received in operation 1j-50 includes an indicator for reporting the QoE measurement value of the multimedia broadcast service, UE 1j-01 may store the QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode in the RRC connection recovery complete message. If the RRC connection recovery message received in operation 1j-50 does not include an indicator for reporting the QoE measurement value of the multimedia broadcast service, as in the above-mentioned embodiment of the present disclosure, the UE 1j-01 may include and transmit an RRC connection recovery complete message (RRCResumeComplete) having an indicator indicating the presence of the QoE measurement value of the multimedia broadcast service.

[0151] In operation 1j-65, UE 1j-01 may transmit a predetermined RRC message (e.g., MeasurementReportAppLayer) containing QoE measurement result information to base station 1j-02. The RRC message may include QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode. The QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode may be included in the predetermined RRC message by a separate indicator or a new IE to distinguish the QoE measurement result information of the multimedia broadcast service measured in RRC connected mode from the QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode. Of course, as in the above-mentioned embodiments of the present disclosure, the QoE measurement result information of the multimedia broadcast service measured in RRC idle mode or RRC inactive mode may be included in the UE information response message (UEInformationResponse). For example, this case is limited to the case where the base station 1j-02 includes an indicator for reporting the QoE measurement result information of the multimedia broadcast service in the UE information request message (UEInformationRequest).

[0152] Fig.11 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure.

[0153] refer to Fig.11 , in operation 1k-05, UE 1k-01 can be in RRC connection mode (RRC_connection) by configuring an RRC connection with base station 1k-02.

[0154] In operation 1k-10, UE 1k-01 may transmit a UE capability information message (UECapabilityInformation) to base station 1k-02. The information included in the message may follow the above-mentioned embodiment. As an example, the message may include information indicating that QoE measurement may be performed on a multimedia broadcast service in RRC idle mode (RRC_idle) or RRC inactive mode (RRC_inactive).

[0155] In operation 1k-15, the base station 1k-02 may transmit a predetermined RRC message (e.g., RRCResume or RRCReconfiguration) including configuration information for application layer measurement (AppLayerMeasConfig) to the UE 1k-01. The QoE measurement configuration information for multimedia broadcast services may be included in the AppLayerMeasConFig. The QoE measurement configuration information for multimedia broadcast services may be applied to all RRC states (RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED). Of course, a separate indicator may be added to apply to RRC_INACTIVE and RRC_IDLE. Additionally, the QoE measurement configuration information for multimedia broadcast services may include a new timer value. As an example, upon receiving the ApplayerMeasConfig, the UE 1k-01 may drive or redrive a new timer with the received new timer value. Alternatively, the UE 1k-01 may drive or redrive a new timer with a new timer value received when transitioning to RRC idle mode or RRC inactive mode. When the driven timer expires, UE 1k-01 may release the QoE measurement configuration information for the multimedia broadcast service. Of course, the QoE measurement result of the multimedia broadcast service may also be released together.

[0156] In operation 1k-20, the base station 1k-02 may transmit an RRC connection release message (RRCRelease) to the UE 1k-01.

[0157] In operation 1k-25, UE 1k-01 may transition to RRC idle mode (RRC_idle) or RRC inactive mode (RRC_inactive). When the RRC connection release message received in operation 1k-20 includes suspended configuration information (suspendConfig), UE 1k-01 may transition to RRC inactive mode, otherwise, UE may transition to RRC idle mode.

[0158] In operation 1k-30, UE 1k-01 in RRC idle mode or RRC inactive mode may select or reselect an inter-RAT cell through a cell selection or cell reselection procedure.

[0159] In operation 1k-35, UE 1k-01 may release the QoE measurement configuration information for the multimedia broadcast service. Additionally, the QoE measurement result value of the multimedia broadcast service may also be released. Alternatively, a running timer of the QoE measurement configuration for the multimedia broadcast service may also be stopped.

[0160] Fig.12 is a diagram illustrating measurement and reporting of a UE for MBS service according to an embodiment of the present disclosure.

[0161] refer to Fig.12 , in operation 1l-05, UE 1l-01 can be in RRC connection mode (RRC_connection) by configuring an RRC connection with base station 1l-02.

[0162] In operation 11-10, UE 11-01 may transmit a UE capability information message (UECapabilityInformation) to base station 11-02. The information included in the message may follow the above-mentioned embodiment. As an example, the message may include information indicating that QoE measurement may be performed on a multimedia broadcast service in RRC idle mode (RRC_idle) or RRC inactive mode (RRC_inactive).

[0163] In operation 11-15, the base station 11-02 may transmit an RRC connection release message (RRCRelease) to the UE 11-01. The message may include QoE measurement configuration information for the multimedia broadcast service. Additionally, the message may include at least one of the following.

[0164] - New timer value

[0165] The UE may drive or re-drive the new timer with the new timer value. While the new timer is running, the UE may perform QoE measurement on the multimedia broadcast service by applying the QoE measurement configuration information for the multimedia broadcast service. If the new timer expires, the UE may stop measuring the QoE of the multimedia broadcast service. Alternatively, when the new timer expires, the QoE measurement result of the multimedia broadcast service may be released.

[0166] - Validity Area

[0167] ■ A validity area may consist of one or more and may include one cell per frequency (of course, if there is no cell, all cells in the corresponding frequency may belong to the validity area). Alternatively, the validity area may include one or more Tracking Area Codes (TACs) or RAN Area Codes (RANACs). The UE may perform QoE measurement configuration for the multimedia broadcast service in the cells belonging to the validity area. When a cell outside the validity area is selected, the UE may release the QoE measurement configuration information for the multimedia broadcast service. In this case, the new timer that is running may also be stopped.

[0168] - QoE measurement frequency / cell list

[0169] ■ The QoE measurement frequency / cell may consist of one or more cells and may also include one cell per frequency (or, it may consist of only one cell or consist of multiple cells). The UE may perform QoE measurement on the multimedia broadcast service in the indicated QoE measurement frequency / cell. If the QoE measurement frequency / cell is not included, the UE may perform QoE measurement on the multimedia broadcast service when the cell provides the multimedia broadcast service.

[0170] For reference, when the UE is able to perform QoE measurement on other services as well as the multimedia broadcast service in RRC idle mode or RRC inactive mode, the above information may be separately signaled in the RRC connection release message.

[0171] In operation 11-20, UE 11-01 may apply the RRC connection release message received in operation 11-15 and transition to an RRC idle mode or an RRC inactive mode.

[0172] In operation 11-23, UE 11-01 in RRC idle mode or RRC inactive mode can obtain system information by camping on a suitable cell. In the system information, QoE measurement configuration information of the multimedia broadcast service can be broadcast. In operation 11-15, the UE that receives the RRC connection release message including the QoE measurement configuration information for the multimedia broadcast service can ignore the QoE measurement configuration information for the multimedia broadcast service in the system information, and apply the QoE measurement configuration information for the multimedia broadcast service included in the RRC connection release information. Otherwise (when the QoE measurement configuration information for the multimedia broadcast service is not included in the RRC disconnect message or is released), the UE can apply the QoE measurement configuration information to the multimedia broadcast service broadcasted in the system information.

[0173] In operation 11-25, according to the above-mentioned embodiment, UE 11-01 in RRC idle mode or RRC inactive mode can receive multimedia broadcast services.

[0174] In operation 11-30, the UE in the RRC idle mode or the RRC inactive mode may perform application layer measurement of the multimedia broadcast service (ie, QoE measurement of the multimedia broadcast service).

[0175] In operation 11-35, UE 11-01 in RRC idle mode or RRC inactive mode can transition to RRC connected mode through an RRC connection setup or RRC connection recovery process with base station 11-02. A UE in RRC idle mode can perform an RRC connection setup process, and a UE in RRC inactive mode can perform an RRC connection recovery process. When transitioning to RRC connected mode, UE 11-01 can release the QoE measurement configuration information for multimedia broadcast services configured by an RRC connection release message. Of course, when a new timer is running, the new timer can be released.

[0176] In operation 11-40, UE 11-01 may transmit a predetermined RRC message (e.g., MeasurementReportAppLayer) containing QoE measurement result information to base station 11-02. The RRC message may include QoE measurement result information of a multimedia broadcast service measured in RRC idle mode or RRC inactive mode. The QoE measurement result information of a multimedia broadcast service measured in RRC idle mode or RRC inactive mode may be included in a predetermined RRC message by a separate indicator or a new IE to distinguish the QoE measurement result information of a multimedia broadcast service measured in RRC connected mode from the QoE measurement result information of a multimedia broadcast service measured in RRC idle mode or RRC inactive mode. Of course, as in the above-mentioned embodiments of the present disclosure, the QoE measurement result information of a multimedia broadcast service measured in RRC idle mode or RRC inactive mode may be included in a UE information response message (UEInformationResponse). For example, this case is limited to a case where the base station includes an indicator for reporting the QoE measurement result information of a multimedia broadcast service in a UE information request message (UEInformationRequest).

[0177] Fig.13 is a block diagram showing an internal structure of a UE according to an embodiment of the present disclosure.

[0178] refer to Fig.13, the UE includes a radio frequency (RF) processor 1m-10, a baseband processor 1m-20, a storage device 1m-30, and a controller 1m-40.

[0179] The RF processor 1m-10 performs functions for transmitting and receiving signals through a radio channel, such as frequency band conversion and amplification of signals. For example, the RF processor 1m-10 up-converts the baseband signal provided by the baseband processor 1m-20 into an RF band signal, transmits the RF band signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processor 1m-10 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 the accompanying drawings, only one antenna is shown, but the UE may include multiple antennas. In addition, the RF processor 1m-10 may include multiple RF chains. In addition, the RF processor 1m-10 may perform beamforming. For beamforming, the RF processor 1m-10 may adjust the phase and amplitude of each of the signals sent and received through multiple antennas or antenna elements. In addition, the RF processor may perform MIMO, and may receive multiple layers when performing MIMO operations.

[0180] The baseband processor 1m-20 performs the conversion function between the baseband signal and the bit stream according to the physical layer standard of the system. For example, when transmitting data, the baseband processor 1m-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 1m-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1m-10. For example, in the case of following the orthogonal frequency division multiplexing (OFDM) scheme, when transmitting data, the baseband processor 1m-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processor 1m-20 divides the baseband signal provided from the RF processor 1m-10 into OFDM symbol units, recovers the signal mapped to the subcarrier through a fast Fourier transform (FFT) operation, and then recovers the received bit stream through demodulation and decoding.

[0181] The baseband processor 1m-20 and the RF processor 1m-10 transmit and receive signals as described above. Therefore, the baseband processor 1m-20 and the RF processor 1m-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. In addition, at least one of the baseband processor 1m-20 and the RF processor 1m-10 may include multiple communication modules to support a variety of different radio access technologies. In addition, at least one of the baseband processor 1m-20 and the RF processor 1m-10 may include different communication modules to process signals of different frequency bands. For example, different radio access technologies may include wireless LAN (e.g., IEEE802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NRHz, NRhz) bands and millimeter wave (e.g., 60 GHz) bands.

[0182] The storage device 1m-30 stores data such as basic programs, applications, and configuration information for the operation of the UE. More specifically, the storage device 1m-30 can store information related to a second access node that performs wireless communication by using a second radio access technology. In addition, the storage device 1m-30 provides the stored data according to a request of the controller 1m-40.

[0183] The controller 1m-40, which may include a multi-connection processor 1m-42, controls the overall operation of the UE. For example, the controller 1m-40 transmits and receives signals through the baseband processor 1m-20 and the RF processor 1m-10. In addition, the controller 1m-40 writes data to the storage device 1m-30 and reads the data. To this end, the controller 1m-40 may include at least one processor. For example, the controller 1m-40 may include a communication processor (CP) that controls communication and an application processor (AP) that controls an upper layer (such as an application).

[0184] Fig.14 is a block diagram showing the configuration of an NR base station according to an embodiment of the present disclosure.

[0185] refer to Fig.14 , the base station is configured to include an RF processor 1n-10, a baseband processor 1n-20, a backhaul communicator 1n-30, a storage device 1n-40 and a controller 1n-50.

[0186] The RF processor 1n-10 performs functions for transmitting and receiving signals through a radio channel, such as frequency band conversion and amplification of signals. For example, the RF processor 1n-10 up-converts the baseband signal provided by the baseband processor 1n-20 into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received by the antenna into a baseband signal. For example, the RF processor 1n-10 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 1n-10 may include multiple RF chains. In addition, the RF processor 1n-10 may perform beamforming. For beamforming, the RF processor 1n-10 may adjust the phase and amplitude of each of the signals sent and received by multiple antennas or antenna elements. The RF processor may perform downlink MIMO operations by transmitting one or more layers.

[0187] The baseband processor 1n-20 performs a conversion function between a baseband signal and a bit stream according to the physical layer standard of the first radio access technology. For example, when transmitting data, the baseband processor 1n-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 1n-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1n-10. For example, in the case of following the OFDM scheme, when transmitting data, the baseband processor 1n-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operations and CP insertion. In addition, when receiving data, the baseband processor 1n-20 divides the baseband signal provided from the RF processor 1n-10 into OFDM symbol units, recovers the signal mapped to the subcarrier through FFT operations, and then recovers the received bit stream through demodulation and decoding. The baseband processor 1n-20 and the RF processor 1n-10 transmit and receive signals as described above. Therefore, the baseband processor 1n-20 and the RF processor unit 1n-10 can be referred to as a transmitter, a receiver, a transceiver, a communicator, or a wireless communicator.

[0188] The backhaul communicator 1n-30 provides an interface for performing communication with other nodes in the network. For example, the backhaul communicator 1n-30 converts a bit stream transmitted from the main 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 stream.

[0189] The storage device 1n-40 stores data such as basic programs, applications, and configuration information for the operation of the main base station. More specifically, the storage device 1n-40 may store information about bearers assigned to accessed UEs, measurement results reported from accessed UEs, and the like. In addition, the storage device 1n-40 may store information that serves as a criterion for determining whether to provide or stop multiple connections to the UE. In addition, the storage device 1n-40 provides the stored data according to a request of the controller 1n-50.

[0190] The controller 1n-50, which may include a multi-connection processor 1n-52, controls the overall operation of the main base station. For example, the controller 1n-50 transmits and receives signals through the baseband processor 1n-20 and the RF processor 1n-10 or through the backhaul communicator 1n-30. In addition, the controller 1n-50 writes data to the storage device 1n-40 and reads the data. To this end, the controller 1n-50 may include at least one processor.

[0191] In the above-mentioned embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the 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 elements expressed in the singular or plural. Therefore, an element expressed in the plural may also include a single element, or an element expressed in the singular may also include multiple elements.

[0192] While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving a message from a base station, the message comprising information for configuring application layer measurement during a period when the terminal is in a radio resource control (RRC) connected state, wherein the information comprises configuration for quality of experience (QoE) measurement of a multimedia broadcast service (MBS) broadcast; identifying whether the information further includes an indicator for identifying at least one RRC state to which the configuration is applied; as well as In case the information further includes the indicator, the QoE measurement is performed using the configuration based on the indicator.

2. The method according to claim 1, in, The indicator indicates all of the RRC connected state, the RRC inactive state, and the RRC idle state.

3. The method according to claim 1, in, The configuration is configured for the RRC connected state, and The indicator indicating the configuration for the RRC connected state is also applied to an RRC inactive state and an RRC idle state.

4. The method of claim 1, further comprising: transmitting to the base station a message including capability information indicating whether the terminal supports the QoE measurement, the capability information being indicated for each RRC state, wherein the information is configured based on the capability information, Wherein, the message is an RRC reconfiguration message, and After reestablishing the RRC connection with the base station, the QoE measurement result is transmitted to the base station.

5. A method performed by a base station in a wireless communication system, the method comprising: Generate information for configuring application layer measurement for a terminal, wherein the information includes a configuration for quality of experience (QoE) measurement of a multimedia broadcast service (MBS) broadcast and an indicator for identifying at least one RRC state to which the configuration is applied; and A message including the information is transmitted to the terminal in the RRC connected state.

6. The method according to claim 5, in, The indicator indicates all of the RRC connected state, the RRC inactive state, and the RRC idle state.

7. The method according to claim 5, in, The configuration is configured for the RRC connected state, and The indicator indicating the configuration for the RRC connected state is also applied to an RRC inactive state and an RRC idle state.

8. The method of claim 5, further comprising: receiving, from the terminal, a message including capability information indicating whether the terminal supports the QoE measurement, the capability information being indicated for each RRC state; as well as Based on the capability information, determining to configure the information for the terminal, Wherein, the RRC message is an RRC reconfiguration message, and After reestablishing the RRC connection with the terminal, receiving the QoE measurement result from the terminal.

9. A terminal in a wireless communication system, the terminal comprising: Transceiver; as well as At least one processor configured to: controlling the transceiver to receive a message from a base station, the message comprising information for configuring application layer measurement during a period when the terminal is in a radio resource control (RRC) connected state, wherein the information comprises configuration for quality of experience (QoE) measurement of a multimedia broadcast service (MBS) broadcast, controlling the transceiver to identify whether the information further includes an indicator for identifying at least one RRC state to which the configuration is applied, and In case the information further includes the indicator, the QoE measurement is performed using the configuration based on the indicator.

10. The terminal according to claim 9, in, The indicator indicates all of the RRC connected state, the RRC inactive state, and the RRC idle state.

11. The terminal according to claim 9, in, The configuration is configured for the RRC connected state, and The indicator indicating the configuration for the RRC connected state is also applied to an RRC inactive state and an RRC idle state.

12. The terminal according to claim 9, in, The at least one processor is further configured to: control the transceiver to transmit a message including capability information indicating whether the terminal supports the QoE measurement to the base station, the capability information being indicated for each RRC state, wherein the information is configured based on the capability information, Wherein, the message is an RRC reconfiguration message, and After reestablishing the RRC connection with the base station, the QoE measurement result is transmitted to the base station.

13. A base station in a wireless communication system, the base station comprising: Transceiver; as well as At least one processor configured to: generating information for configuring application layer measurement for a terminal, wherein the information includes a configuration for quality of experience (QoE) measurement of a multimedia broadcast service (MBS) broadcast and an indicator for identifying at least one RRC state to which the configuration is applied, and The transceiver is controlled to transmit a message including the information to the terminal in the RRC connected state.

14. The base station according to claim 13, in, The indicator indicates all of the RRC connected state, the RRC inactive state, and the RRC idle state.

15. The base station according to claim 13, in, The configuration is configured for the RRC connected state, and The indicator indicating the configuration for the RRC connected state is also applied to an RRC inactive state and an RRC idle state.

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