Method and device for measurement in wireless communication system

Abstract

The present disclosure relates to a method by a terminal, the method comprising: receiving, from a base station, configuration information for at least one measurement gap; receiving DCI for scheduling reception of a PDSCH or transmission of a PUSCH within the measurement gap; and when an indicator included in the DCI indicates that the reception of the PDSCH or the transmission of the PUSCH is permitted within the measurement gap, performing the reception of the PDSCH or the transmission of the PUSCH within the measurement gap, and skipping measurement of the measurement gap.

Description

Method and device for measurement in wireless communication systems

[0001] The present disclosure relates to operations of a terminal and a base station in a wireless communication system, and more particularly, to a method and device for dynamically controlling a Measurement GAP set by a base station to a terminal for a data service sensitive to delay time.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz (THz) band (for example, 3 THz band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It could serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing this technology.

[0008] The present disclosure provides, through various embodiments, a device and method capable of effectively providing a delay-sensitive data transmission service in a wireless communication system.

[0009] In order to solve the above problem, a method performed by a terminal proposed in the present disclosure includes the steps of: receiving configuration information for at least one measurement gap from a base station; receiving, from the base station, downlink control information (DCI) for scheduling reception of a physical downlink shared channel (PDSCH) or transmission of a physical uplink shared channel (PUSCH) within any one of the at least one measurement gap; and performing reception of the PDSCH or transmission of the PUSCH within the measurement gap when an indicator included in the DCI indicates that reception of the PDSCH or transmission of the PUSCH is allowed within the measurement gap, wherein measurement for the measurement gap may be skipped.

[0010] In order to solve the above problem, a method performed by a base station proposed in the present disclosure includes the steps of: transmitting configuration information for at least one measurement gap to a terminal; transmitting downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) within any one of the at least one measurement gap to the terminal; and transmitting the PDSCH or receiving the PUSCH within the measurement gap when an indicator included in the DCI indicates that the PDSCH or the PUSCH is allowed within the measurement gap, wherein measurement for the measurement gap can be skipped.

[0011] In order to solve the above problems, the terminal proposed in the present disclosure includes a transceiver; and a control unit connected to the transceiver, wherein the control unit is configured to: receive configuration information for at least one measurement gap from a base station, receive DCI (downlink control information) for scheduling reception of a physical downlink shared channel (PDSCH) or transmission of a physical uplink shared channel (PUSCH) within any one of the at least one measurement gap, and perform reception of the PDSCH or transmission of the PUSCH within the measurement gap when an indicator included in the DCI indicates that reception of the PDSCH or transmission of the PUSCH is allowed within the measurement gap, and measurement for the measurement gap can be skipped.

[0012] In order to solve the above problems, the base station proposed in the present disclosure includes a transceiver; and a control unit connected to the transceiver, wherein the control unit transmits configuration information for at least one measurement gap to a terminal, and transmits downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) within one of the at least one measurement gap to the terminal, and when an indicator included in the DCI indicates that the PDSCH or the PUSCH is allowed within the measurement gap, the base station is configured to transmit the PDSCH or receive the PUSCH within the measurement gap, and measurement for the measurement gap can be skipped.

[0013] The present disclosure provides a device and method capable of effectively providing a delay-sensitive data transmission service in a wireless communication system.

[0014] The effects that can be obtained from the present disclosure are not limited to the effects mentioned in the various embodiments, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0015] The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments of the present disclosure with reference to the accompanying drawings.

[0016] FIG. 1 illustrates the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0017] FIG. 2 illustrates a wireless protocol structure in a long term evolution (LTE) and new radio (NR) system according to an embodiment of the present disclosure.

[0018] FIG. 3 illustrates an example of data transmission delay due to Measurement GAP settings in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0019] FIG. 4 illustrates a signaling procedure between a terminal and a base station for dynamically controlling Measurement GAP for a delay-sensitive data service in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0020] FIG. 5 illustrates an example of an operation for comparing the priority of GAP and data transmission to determine whether to transmit when the Measurement GAP interval set for a terminal and the uplink data transmission time overlap according to one embodiment of the present disclosure.

[0021] FIG. 6 illustrates an example of an operation in which a base station schedules PUSCH (physical uplink shared channel) / PDSCH (physical downlink shared channel) resources within a Measurement GAP (MG) period set for a terminal according to an embodiment of the present disclosure, thereby allowing data transmission of the terminal within the MG period.

[0022] FIG. 7 illustrates an example of a MAC CE that can be used to activate or deactivate a Measurement GAP set to a terminal in a semi-persistent manner according to an embodiment of the present disclosure.

[0023] FIG. 8 illustrates a terminal device according to an embodiment of the present disclosure.

[0024] FIG. 9 illustrates a base station device according to an embodiment of the present disclosure.

[0025] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. Furthermore, in describing the present disclosure, if a detailed description of a related known function or configuration is determined to unnecessarily obscure the gist of the present disclosure, such detailed description will be omitted. Furthermore, the terms described below are defined in consideration of their functions in the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents throughout this specification. Embodiments of the present invention will be described below with reference to the attached drawings.

[0026] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the invention, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0027] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0028] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0029] Here, the term '~ unit' used in the present embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to play one or more processors. Therefore, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. Furthermore, in an embodiment, the '~part' may include one or more processors.

[0030] In the following description of the present disclosure, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings.

[0031] The terms used in the following description to identify connection 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 provided as examples for convenience of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0032] In the following description, the terms "physical channel" and "signal" may be used interchangeably with data or control signals. For example, while PDSCH (physical downlink shared channel) refers to a physical channel through which data is transmitted, PDSCH can also be used to refer to data. That is, in the present disclosure, the expression "transmitting a physical channel" can be interpreted equivalently to the expression "transmitting data or a signal through a physical channel."

[0033] Hereinafter, in the present disclosure, upper signaling refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of the physical layer, or a terminal transmits a signal to a base station using an uplink data channel of the physical layer. Upper signaling can be understood as radio resource control (RRC) signaling or a media access control (MAC) control element (CE).

[0034] For the convenience of explanation below, this disclosure uses terms and names defined in the 3rd Generation Partnership Project NR (New Radio) or 3rd Generation Partnership Project Long Term Evolution (LTE) standards. However, this disclosure is not limited by the above terms and names, and can be equally applied to systems conforming to other standards. In this disclosure, gNB may be used interchangeably with eNB for the convenience of explanation. That is, a base station described as an eNB may represent a gNB. In addition, the term terminal may represent not only a mobile phone, an MTC device, an NB-IoT device, a sensor, but also other wireless communication devices.

[0035] Hereinafter, the base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNodeB (gNB), an eNode B (eNB), a NodeB, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Of course, the present invention is not limited to the above examples.

[0036] In particular, the present disclosure can be applied to 3GPP NR (5th generation mobile communication standard). Furthermore, the present disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. In the present disclosure, eNB may be used interchangeably with gNB for convenience of explanation. That is, a base station described as eNB may represent a gNB. Furthermore, the term "terminal" may refer to other wireless communication devices as well as mobile phones, NB-IoT devices, and sensors.

[0037] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0038] As a representative example of a broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment; UE or MS; Mobile Station) transmits data or control signals to a base station (eNode B or BS; Base Station), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method distinguishes the data or control information of each user by allocating and operating the time-frequency resources to be transmitted for each user so that they do not overlap, that is, so as to achieve orthogonality.

[0039] As the future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include Enhanced Mobile Broadband (eMBB), Massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0040] In some embodiments, eMBB may aim to provide data rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB should be able to provide a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, a 5G communication system may need to provide an increased user-perceived data rate while simultaneously providing the peak data rate. To meet these requirements, a 5G communication system may require improvements in various transmission and reception technologies, including improved multi-antenna (MIMO) transmission technology. Furthermore, while current LTE transmits signals using a maximum 20 MHz transmission bandwidth in the 2 GHz band, a 5G communication system may utilize a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz band, thereby meeting the data rates required by the 5G communication system.

[0041] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC may require support for large-scale terminal connections within a cell, improved terminal coverage, improved battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km^2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in shadow areas not covered by cells, such as basements, which may require wider coverage than other services provided by 5G communication systems. Terminals supporting mMTC should be comprised of low-cost terminals, and since frequent battery replacement is unlikely, very long battery lifespans, such as 10 to 15 years, may be required.

[0042] Finally, URLLC is a cellular-based wireless communication service used for specific purposes (mission-critical), such as remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts. Therefore, the communication provided by URLLC may need to provide very low latency (ultra-low latency) and very high reliability (ultra-reliability). For example, a service supporting URLLC may need to satisfy an air interface latency of less than 0.5 milliseconds and may also have a requirement for a packet error rate (PER) of less than 10^-5. Therefore, for services supporting URLLC, 5G systems may be required to provide a smaller Transmit Time Interval (TTI) than other services, while simultaneously allocating a wide range of resources in the frequency band to ensure the reliability of the communication link.

[0043] The three services considered in the aforementioned 5G communication system—eMBB, URLLC, and mMTC—can be multiplexed and transmitted in a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters may be used between the services. However, the aforementioned mMTC, URLLC, and eMBB are merely examples of different service types, and the service types applicable to this disclosure are not limited to the aforementioned examples.

[0044] Furthermore, while embodiments of the present disclosure are described below using LTE, LTE-A, LTE Pro, or 5G (or NR, next-generation mobile communication) systems as examples, the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. Furthermore, the embodiments of the present disclosure may be applied to other communication systems with some modifications, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure.

[0045] FIG. 1 illustrates the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0046] Referring to FIG. 1, as illustrated, a wireless access network of a wireless communication system (hereinafter, a next-generation mobile communication system (New Radio, NR or 5G)) may include a next-generation base station (New Radio Node B, hereinafter, gNB) (1-10) and an AMF (1-05, New Radio Core Network Access Management Function). A user terminal (New Radio User Equipment, hereinafter, NR UE or terminal) (1-15) accesses an external network through the gNB (1-10) and the AMF (1-05).

[0047] In Fig. 1, the gNB (1-10) may correspond to an eNB (Evolved Node B) (1-30) of an existing LTE (Long Term Evolution) system. The gNB (1-10) is connected to an NR UE (1-15) via a wireless channel and may provide a service superior to that of an existing Node B (1-20).

[0048] According to one embodiment of the present disclosure, in a next-generation mobile communication system, all user traffic is serviced through a shared channel, so a device is required to collect status information such as the buffer status of UEs, available transmission power status, and channel status, and perform scheduling. This is handled by gNBs (1-10). A single gNB can typically control multiple cells.

[0049] According to one embodiment of the present disclosure, in order to implement ultra-high-speed data transmission compared to existing LTE, it may have a bandwidth greater than the existing maximum bandwidth, and beamforming technology may be additionally used with orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a wireless access technology.

[0050] In addition, according to one embodiment of the present disclosure, an adaptive modulation and coding (AMC) method that determines a modulation scheme and a channel coding rate according to the channel condition of the terminal may be applied. AMF (1-05) may perform functions such as mobility support, bearer setup, and QoS (quality of service) setup. AMF is a device that is responsible for various control functions as well as mobility management functions for the terminal and may be connected to multiple base stations. In addition, the next-generation mobile communication system may also be interoperable with the existing LTE system, and AMF (1-05) may be connected to MME (1-25) through a network interface. MME (1-25) may be connected to eNB (1-30), which is an existing base station. A terminal that supports LTE-NR Dual Connectivity may transmit and receive data while maintaining a connection to not only gNB (1-10) but also eNB (1-30) (1-35).

[0051] FIG. 2 illustrates a wireless protocol structure in an LTE and NR system according to an embodiment of the present disclosure.

[0052] Referring to FIG. 2, the wireless protocol of the NR system may be composed of SDAP (service data adaptation protocol) (2-05)(2-10), PDCP (packet data convergence protocol) (2-15)(2-20), radio link control (RLC) (2-25)(2-30), and MAC (medium access control) (2-35)(2-40) in the terminal and gNB, respectively. SDAP (2-05)(2-10) may perform an operation to map each QoS flow to a specific DRB (data radio bearer), and the SDAP configuration corresponding to each DRB may be provided from a higher layer (e.g., RRC layer).

[0053] According to one embodiment of the present disclosure, PDCP (2-15) (2-20) may be responsible for operations such as IP header compression and / or restoration, and may additionally perform a re-ordering operation on data packets to provide an in-order delivery service to upper layers. In addition, RLC (2-25) (2-30) may reconfigure PDCP PDUs into an appropriate size. MAC (2-35) (2-40) may be connected to a plurality of RLC layer devices configured in one terminal, and may perform operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The physical (PHY) layer (2-45)(2-50) can channel code and modulate upper layer data, create OFDM (orthogonal frequency-division multiplexing) symbols and transmit them through a wireless channel, or perform an operation of demodulating OFDM symbols received through a wireless channel, decoding the channel, and transmitting them to a higher layer.

[0054] In addition, according to one embodiment of the present disclosure, the PHY layer (2-45)(2-50) can use HARQ (hybrid automatic repeat request) for additional error correction, and the receiver can transmit whether or not a packet transmitted by the transmitter has been received with 1 bit. Information on whether or not the packet received by the receiver from the transmitter has been received can be referred to as HARQ ACK / NACK information. In the case of an LTE system, downlink HARQ ACK / NACK information for uplink data transmission can be transmitted through a physical hybrid-ARQ indicator channel (PHICH). In the case of an NR system, downlink HARQ ACK / NACK information for uplink data transmission can be transmitted through a physical downlink control channel (PDCCH), which is a channel through which downlink and / or uplink resource allocation, etc. are transmitted, and the base station can determine whether retransmission is necessary or whether a new transmission can be performed through scheduling information of the terminal.

[0055] Unlike LTE, the reason why the base station in the NR system determines whether retransmission is necessary or a new transmission can be performed based on the scheduling information of the terminal may be because NR applies asynchronous HARQ. Uplink HARQ ACK / NACK information for downlink data transmission can be transmitted via the physical uplink control channel (PUCCH) or the physical uplink shared channel (PUSCH). The PUCCH can generally be transmitted in the uplink of the PCell (primary cell), which will be described later. However, if the terminal supports it, HARQ ACK / NACK information for the SCell (secondary cell), which will be described later, can be transmitted, and in this case, the SCell can be referred to as a PUCCH SCell.

[0056] Although not shown in this drawing, an RRC (radio resource control) layer may exist above the PDCP layer of each terminal and base station, and the RRC layer can exchange connection and measurement-related setting control messages for radio resource control.

[0057] Meanwhile, the PHY layer (2-45)(2-50) may be composed of one or more frequencies and / or carriers, and the technology that sets and uses multiple frequencies simultaneously may be referred to as carrier aggregation (CA). CA technology refers to a technology that additionally uses a primary carrier and one or more secondary carriers instead of using only one carrier for communication between a terminal and a base station (e.g., eNB or gNB), and by using CA technology, the transmission capacity can be increased by the number of secondary carriers. Meanwhile, in LTE and NR systems, a cell within a base station that uses a primary carrier may be referred to as a primary cell or PCell, and a cell within a base station that uses a secondary carrier may be referred to as a secondary cell or SCell.

[0058] FIG. 3 illustrates an example of data transmission delay due to Measurement GAP settings in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0059] Referring to FIG. 3, the base station (3-03) can transmit to the terminal (3-01) the configuration information necessary for the terminal (3-01) to perform data transmission / reception and RRM (Radio Resource Management) / POS (Positioning) measurement operations in the RRC_CONNECTED state through the RRCReconfiguration procedure (3-10). More specifically, the base station (3-03) can instruct the terminal (3-01) to measure the signal strength of neighboring cells other than the serving cell for mobility support or to measure a downlink reference signal (e.g., Positioning Reference Signal) for position estimation. If the terminal (3-01) cannot exchange data and control signals with the serving cell while performing the above-described measurement operation, the base station (3-03) may set a period (i.e., Measurement GAP) for the terminal (3-01) that forces the terminal (3-01) to perform only the required RRM / POS measurement operation without exchanging data and control signals with the serving cell. In addition, the base station may transmit additional settings related to the data transmission and reception operation of the terminal (e.g., DRB (data radio bearer) / LCH (logical channel) settings, DRX (discontinuous reception) settings, CG (configured grant) / SPS (semi-persistent scheduling) settings, etc.) to the terminal.

[0060] In step 3-15, the terminal (3-01) can perform required RRM / Positioning-related measurements within the MG (Measurement GAP) interval according to the base station settings in step 3-10, and perform required user data transmission and reception operations in the remaining intervals. At this time, the user data transmission and reception operations may include uplink / downlink data transmission and reception operations in the RRC_CONNECTED state. In order for the terminal (3-01) to perform only required RRM and Positioning-related measurement operations within the MG interval, other transmission and reception operations except for transmission and reception operations related to the Random Access procedure may be prohibited within the MG interval. This can be described in the specification as shown in Table 1 below.

[0061]

[0062] However, in the case of data that is sensitive to transmission delay time, such as XR service data, a restriction that always prevents the terminal from transmitting and receiving user data within the MG section may cause a degradation of the user-perceived service performance. For example, if uplink data (3-25) that is sensitive to delay time arrives from a higher layer within the terminal (3-01) within the GAP (3-21) section where user data transmission and reception are prohibited, the data may be transmitted (3-27) with a delay after the GAP section has elapsed. In addition, if downlink data (3-35) that is sensitive to delay time arrives from a higher layer within the base station (3-01) within the GAP (3-31) section where user data transmission and reception are prohibited, the data may be transmitted (3-37) with a delay after the GAP section has elapsed.

[0063] Data transmission and reception delays due to MG settings can reduce user satisfaction in delay-sensitive services such as XR. To prevent this decline in user satisfaction, methods for dynamically controlling the MG (Measurement GAP) interval set for RRM / Positioning-related measurements on a terminal and enabling the transmission and reception of delay-sensitive data can be described as illustrated in the embodiments of FIGS. 4, 5, 6, and 7 below.

[0064] FIG. 4 is a diagram illustrating a signaling procedure between a terminal and a base station that dynamically controls a Measurement GAP for a delay-sensitive data service in a wireless communication system according to an embodiment of the present disclosure.

[0065] Referring to FIG. 4, a terminal (4-01) can exchange terminal capability information related to a Measurement GAP (hereinafter referred to as MG) dynamic control operation with a base station (4-03) through a UECapabilityExchange procedure (4-05). Thereafter, the base station (4-03) can provide the terminal (4-01) with configuration information necessary for the terminal (4-01) to dynamically control the Measurement GAP through an RRCReconfiguration procedure (4-10). Thereafter, the terminal (4-01) can dynamically control the MG according to the base station configuration and simultaneously perform RRM (Radio Resource Management) / POS (Positioning) measurement operations and user data transmission / reception operations within the MG. At this time, if the MG section overlaps with the time point when data sensitive to delay time needs to be transmitted and received, the terminal (4-01) dynamically controls the MG set in at least one of the methods described in the embodiments of FIGS. 5, 6, and 7 according to the base station settings, and can transmit and receive data sensitive to delay time. The specific procedures for each step are as follows.

[0066] In step 4-5, the terminal (4-01) and the base station (4-03) can exchange terminal capability information through the UECapabilityExchange procedure. At this time, the terminal can report terminal capability information defined in relation to the MG dynamic control operation (the operation described in the embodiments of FIGS. 5, 6, and 7 below) to the base station (4-03). More specifically, the terminal (4-01) can report to the base station (4-03) at least one combination of the following capability information within a UECapabilityInformation message.

[0067] - (logical channel, LCH) priority-based dynamic MG skipping / de-prioritization: As described in FIG. 5 below, terminal capability information indicating whether to support an operation of dynamically skipping / de-prioritizing the MG if the uplink data transmission has a higher (or equal) priority by comparing the (LCH) priority set for each MG with the (LCH) priority of the pending uplink data transmission (i.e., the pending UL-SCH data transmission) (uplink data transmission may be skipped / de-prioritized if the uplink data transmission has a lower priority). The terminal capability information may be reported per terminal, per MAC entity, per frequency range, or per frequency band.

[0068] - DCI scheduling for PUSCH / PDSCH resource overlapped with MG: As described in FIG. 6 below, when a base station schedules PUSCH / PDSCH resources overlapping with an MG section to a terminal through DCI, terminal capability information indicating whether the terminal supports an operation of performing uplink data transmission and downlink data reception operations according to base station scheduling within the corresponding MG section. The terminal capability information may be reported in units of terminal, MAC entity, frequency range, or frequency band.

[0069] - MAC-CE based MG activation / deactivation: Terminal capability information indicating whether the operation of requesting activation / deactivation of a specific MG to the base station as needed by the terminal using the MAC CE described in FIG. 7, and the base station instructing activation / deactivation of the corresponding MG is supported. This operation may be an operation in which, when an MG is activated based on MAC-CE, the terminal performs measurement while restricting data transmission and reception in the activated MG according to the operation of Table 1 of FIG. 3, and when an MG is deactivated based on MAC-CE, the terminal performs data transmission and reception without any separate restrictions in the deactivated MG section. The terminal capability information may be reported in units of terminals, MAC entities, frequency ranges, or frequency bands. In addition, according to one embodiment of the present disclosure, the terminal may request MG activation or deactivation by considering both the priority of uplink transmission and the priority of the MG.

[0070] In step 4-10, the base station (4-03) can dynamically control the MG when the terminal is in the RRC_CONNECTED state through the RRCReconfiguration procedure and transmit the configuration information necessary for transmitting and receiving delay-sensitive data. More specifically, the base station (4-03) can include at least one combination of the following configuration information in an RRCReconfiguration message and transmit it to the terminal (4-01) based on the terminal capability information reported by the terminal (4-01) in step 4-5.

[0071] - MG configuration (e.g. gapToAddModList-r17): Configures one or more MG configurations (e.g. GapConfig-r17) in a list format. That is, an MG configuration can be configured in a form where the list contains one or more MG configurations.

[0072] - MAC CE based MG activation / deactivation setting: Whether the terminal can request activation and deactivation for each MG based on MAC CE, and whether the base station can instruct activation and deactivation for each MG based on MAC CE, can be set. To this end, a 1-bit indicator indicating whether the MAC CE based activation / deactivation request and instruction operation is set can be set for each MG. That is, each of one or more MG settings can include a 1-bit indicator indicating whether the MAC CE based activation / deactivation request and instruction operation is set. At this time, if the 1-bit indicator included in a specific MG configuration has a value of 0 (or 1), the terminal's MAC CE-based activation / deactivation request operation and the base station's MAC CE-based activation / deactivation instruction operation may be performed / supported for the specific MG configuration, and if the 1-bit indicator has a value of 1 (or 0), the terminal's MAC CE-based activation / deactivation request operation and the base station's MAC CE-based activation / deactivation instruction operation may not be performed / supported for the specific MG configuration. In addition, for one or more MG configurations, a default state (activated state or deactivated state) prior to receiving an activation / deactivation instruction for each MG through MAC CE may be set together through RRC signaling.

[0073] - MG (LCH) priority setting (e.g., gapLCH-priority-r1x): For the operation described in FIG. 5 below, a priority value required for comparison with the priority of uplink data transmission can be set for each MG unit (e.g., GapConfig unit). An example of using the (LCH) priority value set for each MG unit is as described in FIG. 5 below. The priority value for comparing the priority of an MG and the priority of uplink data transmission, set for each MG unit (e.g., GapConfig unit), has a different meaning from the priority value per MG (gapPriority-r17), which is a value used to compare priorities between MGs when a collision occurs between MGs. That is, each MG setting can include both a priority value for comparing the priority of an MG and the priority of uplink data transmission and a priority value for comparing priorities between MGs.

[0074] - (LCH) priority-based MG skipping / prioritization operation setting (e.g., priorityCompareMG): As described in FIG. 5 below, when MG and uplink data transmission overlap, a 1-bit indicator may be set to indicate whether to set (Enable or Disable) an operation for the terminal to dynamically skip / de-prioritize the MG by comparing the (LCH) priority set for the MG with the uplink data transmission priority. The 1-bit indicator may be set in units of MAC-CellGroup, GapConfig, and LogicalChannelConfig.

[0075] - Setting of PUSCH / PDSCH resource scheduling operation within DCI-based MG section (e.g., allowTxRxMG): As described in FIG. 6 below, a 1-bit indicator may be set to indicate whether the base station schedules PUSCH / PDSCH resources within the MG section to the terminal via DCI, and the terminal transmits and receives uplink / downlink data through the corresponding resources within the MG section (Enable or Disable). The 1-bit indicator may be set per MAC-CellGroup, GapConfig.

[0076] - Maximum number of MG skipping / de-prioritization times / frequency: As described in FIG. 5 below, if the UE skips / de-prioritizes the MG too / excessively frequently (or continuously) for uplink transmission, the requirements for the RRM / POS measurement operation that the UE must perform in the corresponding MG section may not be satisfied. Therefore, the base station may set the maximum number of consecutive MG skipping times that the UE can skip / de-prioritize the MG and / or the maximum number of MG skipping within a certain time window and / or the maximum frequency that the UE can skip / de-prioritize the MG (Maximum MG skipping frequency). Here, the maximum frequency at which the terminal can skip / de-prioritize the MG can be set in the form of N times per specific time unit (e.g., 5 times per 1 second). The above values ​​can be set in MAC-CellGroup, GapConfig units. If the base station sets the maximum number of consecutive times or frequency of the MG skipping / de-prioritization operation as described above, the terminal can perform the MG skipping / de-prioritization operation as described in FIG. 5 below, while complying with the set maximum number of consecutive times or frequency. In other words, the terminal can be prohibited from performing the MG skipping / de-prioritization operation exceeding the set maximum number of consecutive times or frequency.

[0077] As another method to satisfy the requirements for RRM / POS measurement operations that a terminal must perform in the MG section, the terminal can determine whether to allow MG skipping / de-prioritization operations on its own according to the conditions specified in the specification, even if the base station does not set the maximum number of consecutive operations or frequency. For example, if the terminal determines that all measurements set for the terminal can be performed even if the MG is skipped / deprioritized, the terminal can perform the MG skipping / deprioritization operation described in FIG. 5 below. The conditions for determining whether the terminal can perform the set measurement operations without the MG (even if the MG is skipped / deprioritized) can be described in the specification as shown in Table 2 below.

[0078]

[0079] In step 4-15, the base station (4-03) can transmit DCI to the terminal (4-01) for scheduling PUSCH / PDSCH resources within the MG. In order to indicate whether data transmission and reception operations within the MG section described in FIG. 6 are permitted, the DCI may include a new 1-bit indicator or the DCI may be scrambled with a newly defined RNTI. After receiving the DCI, the terminal (4-01) can confirm whether data transmission and reception operations within the MG section are permitted, and then perform data transmission and reception operations within the MG section using the PDSCH / PUSCH resources scheduled through the DCI in step 4-20.

[0080] In step 4-20, the terminal (4-01) can transmit uplink data or receive downlink data within the MG section according to the method described in FIG. 5 or FIG. 6 below.

[0081] In step 4-25, the terminal (4-01) can request the base station to activate or deactivate the corresponding MG depending on whether a delay-sensitive data transmission is expected within a specific MG section. For example, when the terminal (4-01) performs periodic uplink data transmission (e.g., uplink transmission based on configured grant), if the next transmission time overlaps with a specific MG section, the terminal can detect this in advance and request the base station (4-03) to deactivate the corresponding MG. To this end, the terminal (4-01) can transmit an uplink MAC CE to the base station (4-03), and indicate the MG for which the activation / deactivation request is being made and whether the activation / deactivation request is being made through the MAC CE. At this time, if the MAC CE-based MG activation / deactivation operation is set for each MG in step 4-10, the terminal (4-01) can only indicate (allowed) MGs for which the operation is set through the MAC CE. The specific MAC CE structure for this is as described in Fig. 7 below. After receiving the MAC CE, the base station (4-03) can determine that the terminal (4-01) requests activation or deactivation of a specific MG. Thereafter, the base station (4-03) can instruct activation or deactivation of a specific MG through downlink MAC CE transmission in step 4-30 below. A specific embodiment of the MAC CE structure is as described in Fig. 7 below.

[0082] In step 4-30, the base station (4-03) can instruct the terminal to activate or deactivate a specific MG through downlink MAC CE transmission. The base station (4-03) can determine whether to activate / deactivate a specific MG based on the uplink MAC CE transmitted by the terminal (4-01) in step 4-25. Alternatively, the base station (4-03) can independently determine whether to activate / deactivate the MG depending on whether downlink data transmission is expected within a specific MG section. In order to instruct the terminal (4-01) to activate / deactivate a specific MG, the base station (4-03) can transmit a downlink MAC CE to the terminal, and can indicate the MG to be activated / deactivated and whether to activate / deactivate it through the MAC CE. The terminal (4-01) that receives the MAC CE can activate or deactivate the MAC CE according to the instruction of the base station.

[0083] FIG. 5 illustrates an example of an operation for comparing the priority of GAP and data transmission to determine whether to transmit when the Measurement GAP interval set for a terminal and the uplink data transmission time overlap according to one embodiment of the present disclosure.

[0084] Referring to FIG. 5, an LCH (Logical Channel) for transmitting user data can be set up for the terminal (5-01) together with MGs (5-10, 5-20) required for RRM / positioning-related measurements. This configuration information can be provided to the terminal (5-01) through an RRCReconfiguration message from the base station (5-03) in step 4-10 of FIG. 4. According to the configuration, the terminal (5-01) can perform RRM / positioning-related measurements within the MG section and transmit and receive user data as needed in other sections. In addition, the terminal can transmit uplink data within a specific MG section if at least one combination of the following conditions is satisfied for a delay-sensitive data service (e.g., XR service).

[0085] - Condition 1: When 'priority-based MG skipping / prioritization operation' is set in step 4-10 of the above-mentioned FIG. 4. More specifically, when 'priority-based MG skipping / prioritization operation' is enabled in the MAC-CellGroup setting corresponding to the MG, the MG setting, or the LogicalChannelConfig setting corresponding to the uplink data.

[0086] - Condition 2: When the priority of the uplink data transmission generated within the MG is higher than the (LCH) priority of the MG. Here, the (LCH) priority of the MG may refer to the (LCH) priority set per MG (by MG) in step 4-10 of FIG. 4. In addition, the priority of the uplink data transmission may refer to 1) the priority of the logical channel with the highest priority among the logical channels corresponding to the (multiplexed) uplink data included in the uplink transmission, or 2) the priority of the logical channel corresponding to the uplink data that initially caused (triggered) the uplink transmission. More specifically, when the uplink data transmission (5-13) is caused within a specific MG (GAP1, 5-10) section, the terminal (5-01) may compare the priority value (2) of the MG with the priority value (3) of the uplink data transmission. In this embodiment, it is assumed that a lower priority value means a higher priority, and in this case, since the priority of the MG (5-10) is higher than the priority of the uplink data transmission (5-23) that occurred within the MG section, the condition 2 above is not satisfied. Therefore, the uplink transmission may be delayed after the end of the MG section, as in 5-15. As another example, if the uplink data transmission (5-23) occurs within a specific MG (GAP2, 5-20) section, the terminal can compare the priority value (3) of the MG and the priority value (2) of the uplink data transmission.In this embodiment, it is assumed that a lower priority value means a higher priority, and in this case, the priority of the uplink data transmission (5-23) occurring within the MG section is higher than the priority of the MG (5-20), so the above condition 2 can be satisfied. In this case, uplink data transmission can also be allowed within the MG section, as in 5-25. Additionally, if the priorities of the MG and the uplink data transmission are the same, whether the above condition 2 is satisfied can be determined by one of the following options.

[0087] * Option 1: Uplink transmission (UL-SCH transmission) can be prioritized. In other words, since the priority of uplink transmission is higher than that of the MG, condition 2 above can be considered satisfied.

[0088] * Option 2: MG can be prioritized. In other words, the priority of uplink transmission can be considered lower than that of MG, so condition 2 above is not satisfied.

[0089] * Option 3: NW settings can be followed. For example, in steps 4-10 of FIG. 4, the base station can configure the terminal to prioritize which uplink data transmission and MG priority are given priority when they are the same.

[0090] * Option 4: This can be left to the terminal implementation. When uplink data transmission and MG have the same priority, which one to prioritize (whether condition 2 is satisfied) can be left to the terminal implementation.

[0091] - Condition 3: As described in step 4-10 of the above-mentioned FIG. 4, when the 'maximum MG skipping / de-prioritization number / frequency' is set by the base station (5-03), the terminal (5-01) cannot skip or de-prioritize an MG more than the set maximum continuous number or frequency in order to perform uplink transmission within the MG section. In other words, the terminal (5-01) can perform uplink data transmission within the MG section only when the current skipping / de-prioritization number / frequency for a specific MG does not exceed the 'maximum MG skipping / de-prioritization number / frequency' set by the base station (5-03) for the MG. If the above 'maximum MG skipping / de-prioritization number / frequency' is not separately set, the terminal (5-01) can determine whether it can perform the set measurement operation without the corresponding MG (even if the corresponding MG is skipped / deprioritized) as described in step 4-10 of the above-described FIG. 4, and can perform uplink transmission within the corresponding MG section only if it can perform the set measurement operation without the corresponding MG.

[0092] If it is determined that uplink transmission is possible within a specific MG section through a combination of at least one of the above conditions (condition 1, condition 2, condition 3), the terminal (5-01) can perform uplink transmission within the MG section through one of the following two options.

[0093] - Option 1: The terminal can skip or deactivate the MG once. When deactivating an MG, the deactivated MG will remain inactive until reactivated or will be automatically reactivated in the next cycle. When the MG is skipped or deactivated, the terminal can perform uplink data transmission without any restrictions, as if it were outside the MG section.

[0094] - Option 2: The terminal may regard the MG as a de-prioritized MG and temporarily allow at least one combination of the following MAC layer operations for prioritized uplink transmission within the de-prioritized MG period.

[0095] * Allow SR (scheduling request) transmission operation

[0096] * Allow PDCCH (physical downlink control channel) monitoring operation

[0097] * Allows data transmission on UL-SCH (uplink shared channel). More specifically, in HARQ process operation, even if there is an MG at the Tx time, if the MG is a de-prioritized MG, transmission is allowed to be performed on the physical layer.

[0098] FIG. 6 illustrates an example of an operation in which a base station schedules PUSCH / PDSCH resources within a Measurement GAP (MG) period set for a terminal with DCI, thereby allowing data transmission of the terminal within the MG period, according to one embodiment of the present disclosure.

[0099] Referring to FIG. 6, MGs (6-10, 6-20) required for RRM / positioning related measurements can be configured for the terminal (6-01). The configuration information can be provided to the terminal (6-01) through an RRCReconfiguration message from the base station (6-03) in step 4-10 of FIG. 4. According to the configuration, the terminal (6-01) can perform RRM / positioning related measurements within the MG section and transmit and receive user data as needed in other sections. In addition, the base station (6-03) can schedule PUSCH or PDSCH resources overlapping with a specific MG section to the terminal (6-01) through DCI (06-15, 06-25) for delay-sensitive data services (e.g., XR services). If at least one combination of the following conditions is satisfied, the terminal (6-01) can perform uplink data transmission (06-27) and downlink data reception (06-17) operations within a specific MG section using the PUSCH and PDSCH resources scheduled with the corresponding DCI.

[0100] - Condition 1: When 'DCI-based PUSCH / PDSCH resource scheduling operation within the MG interval' is set in step 4-10 of the above-mentioned FIG. 4. More specifically, when 'DCI-based PUSCH / PDSCH resource scheduling operation within the MG interval' is indicated to be enabled in the MAC-CellGroup setting corresponding to the MG or the GapConfig setting.

[0101] - Condition 2: When the DCI transmitted by the base station to the terminal in step 4-15 of the above drawing 4 to schedule PUSCH / PDSCH resources within a specific MG section includes a 1-bit indicator for allowing data transmission and reception within the MG section or is scrambled with a specific RNTI defined for allowing data transmission and reception within the MG section.

[0102] The base station (6-03) can predict that the MG section (06-10) set for the terminal (6-01) starts immediately after the arrival (06-13) of downlink data that is sensitive to delay time, and if the MG satisfies the above condition 1, the base station can generate a DCI for scheduling PDSCH resources within the MG section in accordance with the above condition 2 (a 1-bit indicator for allowing data transmission and reception within the MG section is included in the DCI or the DCI is scrambled with a specific RNTI defined to allow data transmission and reception within the MG section) and transmit the DCI to the terminal (6-01). In addition, if the arrival (06-24) of uplink data that is sensitive to delay time, the terminal (6-01) can report this to the base station (6-01) through a BSR (buffer state report) / DSR (Delay status report) (06-24). Immediately after the base station (6-03) determines that the terminal (6-01) must transmit delay-sensitive uplink data through BSR / DSR (06-24), the base station (6-03) predicts that the MG section (06-20) set for the terminal (6-01) begins, and if the MG satisfies the above condition 1, the base station (6-03) can generate and transmit to the terminal a DCI for scheduling PUSCH resources within the MG section in accordance with the above condition 2.

[0103] Through a combination of at least one of the above conditions 1 and 2, the terminal (6-01) can determine that uplink transmission and downlink reception operations are possible within a specific MG section using resources scheduled through the corresponding DCI. In this case, the terminal (6-01) can perform downlink data reception (06-17) or uplink data transmission (06-27) operations exceptionally within the MG section by skipping / deactivating the corresponding MG itself as in option 1 of FIG. 5, or by using PDSCH / PUSCH resources scheduled through DCI (06-15) while maintaining the activation state of the corresponding MG. More specifically, when PDSCH resources overlapping with the MG section are scheduled through DCI (06-15), the terminal (6-01) can use the corresponding resources to receive (06-17) downlink data within the MG section (for the corresponding DL assignment). Additionally, if PUSCH resources overlapping with the MG section are scheduled through DCI (06-25), the terminal (6-01) can transmit (06-27) uplink data within the MG section (for the corresponding UL grant) using the corresponding resources.

[0104] The above terminal operation can be described in the standard as shown in Table 3 below.

[0105]

[0106] FIG. 7 illustrates an example of a MAC CE that can be used to activate or deactivate a Measurement GAP set to a terminal in a semi-persistent manner according to an embodiment of the present disclosure.

[0107] Referring to FIG. 7, the MAC CE for requesting activation or deactivation of a specific MG by a terminal in step 4-25 of FIG. 4 and the MAC CE for instructing activation or deactivation of a specific MG by a base station in step 4-30 may have the same structure. However, each MAC CE may be distinguished by a separate (e)LCID depending on its purpose. One of the following two options may be considered for the MAC CE structure.

[0108] - Option 1 (7-10): An option that can request / instruct activation or deactivation for one MG at a time. The MAC CE may include an ID value (7-15) of the target MG for which activation or deactivation is to be requested / instructed. The MG ID may be an ID value (e.g., measGapId) of one of the MGs configured to allow MAC CE-based activation / deactivation operation through the RRCReconfiguration message in step 4-10 of FIG. 4. In addition, the MAC CE may include a 1-bit indicator (A / D, 7-13) for indicating whether activation or deactivation of the target MG is requested / instructed. If a MAC CE for requesting / instructing activation or deactivation is defined separately and distinguished by (e)LCID, the 1-bit indicator (A / D, 7-13) may be omitted.

[0109] - Option 2 (7-20): An option that can request / instruct activation or deactivation for multiple MGs at once. The MAC CE can request / instruct activation or deactivation status for each of one or multiple target MGs for which activation or deactivation is to be requested / instructed through a 1-bit indicator (MGi). Here, each MGi corresponds to one of the MGs configured to allow MAC CE-based activation / deactivation operation through the RRCReconfiguration message in step 4-10 of the above-described FIG. 4, and can be corresponded in ascending / descending order of the ID values ​​(measGapId) of each MG. For example, if there are three MGs that are allowed to be activated or deactivated, each with an MG ID of 1, 4, and 10, where the 1-bit indicator (MGi) corresponds to the ascending order of the MG IDs, the MAC CE may include three indicators corresponding to the three MGs, and MG(i = 1) may correspond to the MG whose MG ID is 1, MG(i = 2) may correspond to the MG whose MG ID is 4, and MG(i = 3) may correspond to the MG whose MG ID is 10. The above option 2 may have an advantage over option 1 in that it may request and instruct multiple MGs to be activated or deactivated simultaneously.

[0110] FIG. 8 is a block diagram illustrating the internal structure of a terminal according to an embodiment of the present disclosure.

[0111] Referring to FIG. 8, the terminal includes an RF (Radio Frequency) processing unit (9-10), a baseband processing unit (8-20), a storage unit (8-30), and a control unit (8-40). Of course, the present invention is not limited to the above example, and the terminal may include fewer or more components than those illustrated in FIG. 9. The RF processing unit (8-10) may perform functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (8-10) up-converts a baseband signal provided from the baseband processing unit (8-20) into an RF band signal and then transmits it through an antenna, and down-converts an RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (8-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. In Fig. 9, only one antenna is illustrated, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (8-10) may include multiple RF chains. Furthermore, the RF processing unit (8-10) may perform beamforming. For beamforming, the RF processing unit (8-10) may adjust the phase and magnitude of each signal transmitted and received through multiple antennas or antenna elements. In addition, the RF processing unit (8-10) may perform MIMO (multi-input multi-output) and may receive multiple layers when performing MIMO operation. The RF processing unit (8-10) may perform reception beam sweeping by appropriately setting multiple antennas or antenna elements under the control of the control unit (8-40), or may adjust the direction and beam width of the reception beam so that the reception beam is coordinated with the transmission beam.

[0112] The baseband processing unit (8-20) can perform a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (8-20) can generate complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (8-20) can restore the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (8-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (8-20) can generate complex symbols by encoding and modulating a transmission bit stream, map the complex symbols to subcarriers, and then configure OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit (8-20) divides the baseband signal provided from the RF processing unit (8-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT (fast Fourier transform) operation, and then restores the received bit string through demodulation and decoding.

[0113] The baseband processing unit (8-20) and the RF processing unit (8-10) can transmit and receive signals as described above. The baseband processing unit (8-20) and the RF processing unit (8-10) may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit (8-20) and the RF processing unit (8-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processing unit (8-20) and the RF processing unit (8-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. In addition, the different frequency bands may include a super high frequency (SHF) (e.g., 2.NRHz, NRhz) band and a millimeter wave (mm wave) (e.g., 60GHz) band. The terminal may transmit and receive signals with the base station using the baseband processing unit (8-20) and the RF processing unit (8-10), and the signals may include control information and data.

[0114] The storage unit (8-30) can store data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (8-30) can store information related to a second access node that performs wireless communication using a second wireless access technology. In addition, the storage unit (8-30) can provide the stored data upon request from the control unit (8-40). In addition, the storage unit (8-30) may be configured with multiple memories. According to one embodiment, the storage unit (8-30) may store a program for performing the split bearer operation method of the present disclosure.

[0115] The control unit (8-40) can control the overall operations of the terminal. For example, the control unit (8-40) can transmit and receive signals through the baseband processing unit (8-20) and the RF processing unit (8-10). In addition, the control unit (8-40) can record and read data in the storage unit (8-40). For this purpose, the control unit (8-40) can include at least one processor. For example, the control unit (8-40) can include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. In addition, at least one component within the terminal can be implemented as a single chip. In addition, according to one embodiment of the present disclosure, the control unit (8-40) can include a multi-connection processing unit (8-42) that performs processing for operating in a multi-connection mode.

[0116] FIG. 9 is a block diagram showing the configuration of a base station according to an embodiment of the present disclosure.

[0117] Referring to FIG. 9, the base station may include an RF processing unit (9-10), a baseband processing unit (9-20), a backhaul communication unit (10-30), a storage unit (9-40), and a control unit (9-50). Of course, the present invention is not limited to the above example, and the base station may include fewer or more components than the configuration illustrated in FIG. 10.

[0118] The RF processing unit (9-10) can perform functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (9-10) can up-convert the baseband signal provided from the baseband processing unit (9-20) into an RF band signal and transmit it through an antenna, and down-convert the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (9-10) can include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In Fig. 10, only one antenna is illustrated, but the base station can have multiple antennas. In addition, the RF processing unit (9-10) can include multiple RF chains. Furthermore, the RF processing unit (9-10) can perform beamforming. For beamforming, the RF processing unit (9-10) can adjust the phase and magnitude of each signal transmitted and received through multiple antennas or antenna elements. The RF processing unit (9-10) can perform a downlink MIMO operation by transmitting one or more layers. The RF processing unit (9-10) can perform reception beam sweeping by appropriately setting multiple antennas or antenna elements under the control of the control unit, or can adjust the direction and beam width of the reception beam so that the reception beam is coordinated with the transmission beam.

[0119] The baseband processing unit (9-20) can perform a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (9-20) can generate complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (9-20) can restore the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (9-10). For example, in the case of OFDM, when transmitting data, the baseband processing unit (9-20) can generate complex symbols by encoding and modulating a transmission bit stream, map the complex symbols to subcarriers, and then configure OFDM symbols through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit (9-20) can divide the baseband signal provided from the RF processing unit (9-10) into OFDM symbol units, restore the signals mapped to subcarriers through FFT operation, and then restore the received bit string through demodulation and decoding. The baseband processing unit (9-20) and the RF processing unit (9-10) can transmit and receive signals as described above. Accordingly, the baseband processing unit (9-20) and the RF processing unit (9-10) may be referred to as a transmitting unit, a receiving unit, a transceiver unit, a communication unit, or a wireless communication unit. The base station can transmit and receive signals with the terminal using the baseband processing unit (9-20) and the RF processing unit (9-10), and the signals may include control information and data.

[0120] The backhaul communication unit (9-30) can provide an interface for communicating with other nodes within the network. That is, the backhaul communication unit (9-30) can convert a bit string transmitted from a primary base station to another node, such as an auxiliary base station or a core network, into a physical signal, and can convert a physical signal received from another node into a bit string.

[0121] The storage unit (9-40) can store data such as basic programs, application programs, and configuration information for the operation of the base station. In particular, the storage unit (9-40) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, etc. In addition, the storage unit (9-40) can store information that serves as a judgment criterion for whether to provide or terminate multiple connections to a terminal. In addition, the storage unit (9-40) can provide the stored data at the request of the control unit (9-50). The storage unit (9-40) can also store a program for performing the split bearer operation method of the present disclosure.

[0122] The control unit (9-50) can control the overall operations of the base station. For example, the control unit (9-50) can transmit and receive signals through the baseband processing unit (9-20) and the RF processing unit (9-10) or through the backhaul communication unit (9-30). In addition, the control unit (9-50) can record and read data in the storage unit (9-40). For this purpose, the control unit (9-50) can include at least one processor. In addition, at least one component of the base station can be implemented as a single chip. In addition, at least one component of the base station can be implemented as a single chip. In addition, each component of the base station can operate to perform the embodiments of the present disclosure described above.

[0123] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0124] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present disclosure.

[0125] These programs (software modules, software) may be stored in a non-volatile memory including random access memory, flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage devices, compact disc ROMs (CD-ROMs), digital versatile discs (DVDs) or other forms of optical storage devices, magnetic cassettes, or may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may include multiple copies.

[0126] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0127] In the specific embodiments of the present disclosure described above, components included in the invention are expressed in the singular or plural form, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0128] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be defined not only by the scope of the claims described below, but also by equivalents thereof.

Claims

1. In a method performed by a terminal of a wireless communication system, A step of receiving setting information for at least one measurement gap from a base station; A step of receiving, from the base station, DCI (downlink control information) for scheduling reception of a physical downlink shared channel (PDSCH) or transmission of a physical uplink shared channel (PUSCH) within any one of the at least one measurement gap; and If an indicator included in the DCI indicates that reception of the PDSCH or transmission of the PUSCH is allowed within the measurement gap, a step of performing reception of the PDSCH or transmission of the PUSCH within the measurement gap is included. A method wherein measurement for the above measurement gap is skipped.

2. In paragraph 1, A method wherein the DCI is received before the measurement gap, and the measurement gap is the first measurement gap after the DCI.

3. In paragraph 1, A method wherein the above configuration information is received via RRC (radio resource control) signaling, and the RRC signaling indicates whether at least one of reception of the PDSCH or transmission of the PUSCH is allowed within the measurement gap.

4. In paragraph 1, A method in which measurement for the measurement gap is performed when the DCI does not include the indicator or the indicator indicates that reception of the PDSCH or transmission of the PUSCH is not permitted within the measurement gap.

5. In a method performed by a base station of a wireless communication system, A step of transmitting setting information for at least one measurement gap to a terminal; A step of transmitting DCI (downlink control information) for scheduling a PDSCH (physical downlink shared channel) or a PUSCH (physical uplink shared channel) within one of the at least one measurement gap to the terminal; and If an indicator included in the DCI indicates that the PDSCH or the PUSCH is allowed within the measurement gap, a step of transmitting the PDSCH or receiving the PUSCH within the measurement gap is included. A method wherein measurement for the above measurement gap is skipped.

6. In paragraph 5, A method wherein the DCI is transmitted before the measurement gap, and the measurement gap is the first measurement gap after the DCI.

7. In paragraph 5, A method wherein the above configuration information is transmitted via RRC (radio resource control) signaling, and the RRC signaling indicates whether at least one of the PDSCH or the PUSCH is allowed within the measurement gap.

8. In the terminal of a wireless communication system, Transmitter and receiver; and Includes a control unit connected to the above transmitter and receiver, The above control unit: Receive configuration information for at least one measurement gap from a base station, Receive DCI (downlink control information) from the base station for scheduling reception of a PDSCH (physical downlink shared channel) or transmission of a PUSCH (physical uplink shared channel) within any one of the at least one measurement gaps, If the indicator included in the DCI indicates that reception of the PDSCH or transmission of the PUSCH is allowed within the measurement gap, the PDSCH is set to be received or the PUSCH is transmitted within the measurement gap, A terminal in which measurement for the above measurement gap is skipped.

9. In paragraph 8, A terminal wherein the DCI is received before the measurement gap, and the measurement gap is the first measurement gap after the DCI.

10. In paragraph 8, A terminal wherein the above configuration information is received via RRC (radio resource control) signaling, and the RRC signaling indicates whether at least one of reception of the PDSCH or transmission of the PUSCH is allowed within the measurement gap.

11. In paragraph 8, A terminal in which measurement for the measurement gap is performed when the DCI does not include the indicator or the indicator indicates that reception of the PDSCH or transmission of the PUSCH is not permitted within the measurement gap.

12. In a base station of a wireless communication system, Transmitter and receiver; and Includes a control unit connected to the above transmitter and receiver, The above control unit: Transmitting configuration information for at least one measurement gap to the terminal, Transmitting DCI (downlink control information) to the terminal for scheduling a PDSCH (physical downlink shared channel) or a PUSCH (physical uplink shared channel) within any one of the at least one measurement gaps, If the indicator included in the DCI indicates that the PDSCH or the PUSCH is allowed within the measurement gap, the PDSCH is set to be transmitted or the PUSCH is set to be received within the measurement gap, A base station in which measurements for the above measurement gap are skipped.

13. In paragraph 12, A base station, wherein the DCI is transmitted before the measurement gap, and the measurement gap is the first measurement gap after the DCI.

14. In paragraph 12, A base station, wherein the above configuration information is transmitted via RRC (radio resource control) signaling, and the RRC signaling indicates whether at least one of the PDSCH or the PUSCH is allowed within the measurement gap.

15. In paragraph 12, A base station, wherein measurement for the measurement gap is performed when the DCI does not include the indicator or the indicator indicates that the PDSCH or the PUSCH is not allowed within the measurement gap.

Images