Method and apparatus for configuring carrier aggregation for serving cells with different starting time points in a frame in a wireless communication system

Abstract

The present disclosure relates to a communication method and system for integrating a fifth generation (5G) communication system for supporting a higher data rate beyond a fourth generation (4G) system with an Internet of Things (IoT) technology. The present disclosure can be applied to intelligent services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected cars, health care, digital education, smart retail, safety and security services. According to the present disclosure, a base station can use carrier aggregation (CA) to configure a service cell with different frame start time points for the operation of a terminal, and thus the transmission rate of the terminal can be increased.

Description

Technical Field

[0001] The present disclosure relates to a method for configuring serving cells having different frame start time points using carrier aggregation (CA) in a New Radio (NR) system which is a fifth generation (5G) mobile communication system. Background Art

[0002] In order to meet the demand for increased wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (e.g., 60GHz bands) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multipoints (CoMP), receiving-end interference elimination, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet, which is a human-centered connected network in which humans generate and consume information, is now evolving toward the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers. As IoT implementation requires technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology", sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been recently studied. Such an IoT environment can provide intelligent Internet technology services to create new value for human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services through the integration and combination between existing information technology (IT) and various industrial applications.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. Cloud radio access networks (RANs) as an application of the above-mentioned big data processing technologies can also be considered as an example of the fusion between 5G technologies and IoT technologies.

[0005] Meanwhile, a method for configuring carrier aggregation (CA) for serving cells having different frame start time points is required.

[0006] The above information is provided as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0007] Technical issues

[0008] Aspects of the present disclosure are to address at least the above problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a method for configuring serving cells with different frame start time points using carrier aggregation (CA).

[0009] 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.

[0010] Problem Solution

[0011] According to one aspect of the present disclosure, a method for a terminal in a wireless communication system is provided. The method includes: sending a first message, the first message including capability information indicating whether the terminal supports a carrier aggregation operation in which the frame boundaries of a first cell and a second cell are not aligned; receiving a second message, the second message including time slot offset information between the first cell and the second cell; and determining a time offset of the second cell based on the first cell according to the time slot offset information when the frame boundaries of the first cell and the second cell are not aligned.

[0012] According to another aspect of the present disclosure, a method for a base station in a wireless communication system is provided. The method includes: receiving a first message including capability information indicating whether a terminal supports a carrier aggregation operation in which a frame boundary of a first cell and a second cell are not aligned; determining a second message including time slot offset information between the first cell and the second cell; and sending a second message, wherein, in the case where the frame boundary of the first cell and the second cell are not aligned, determining a time offset of the second cell based on the first cell according to the time slot offset information.

[0013] 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, the at least one processor being configured to control the transceiver to send a first message, wherein the first message includes capability information indicating whether the terminal supports a carrier aggregation operation in which frame boundaries of a first cell and a second cell are not aligned, and receive a second message, wherein the second message includes time slot offset information between the first cell and the second cell, and when the frame boundaries of the first cell and the second cell are not aligned, determine a time offset of the second cell based on the first cell according to the time slot offset information.

[0014] 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, the at least one processor being configured to control the transceiver to receive a first message, the first message including capability information indicating whether a terminal supports a carrier aggregation operation in which frame boundaries of a first cell and a second cell are not aligned, determine a second message, the second message including time slot offset information between the first cell and the second cell, and control the transceiver to send the second message, wherein, when the frame boundaries of the first cell and the second cell are not aligned, a time offset of the second cell based on the first cell is determined according to the time slot offset information.

[0015] Advantageous Effects of the Invention

[0016] According to an embodiment, the base station may configure serving cells having different frame start time points using CA for operation of the terminal, and thus may increase the transmission rate of the terminal.

[0017] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 The structure of a long term evolution (LTE) system according to an embodiment of the present disclosure is shown;

[0020] Figure 2 The wireless protocol structure of the LTE system according to the embodiment of the present disclosure is shown;

[0021] Figure 3A is a view for explaining a carrier aggregation (CA) technology in a terminal according to an embodiment of the present disclosure;

[0022] Figure 3Bis a view for explaining a carrier aggregation (CA) technology in a terminal according to an embodiment of the present disclosure;

[0023] Figure 4 is a view for explaining a discontinuous reception (DRX) operation of a terminal according to an embodiment of the present disclosure;

[0024] Figure 5 shows an operation sequence of a terminal when operating by configuring a serving cell with different frame timing using CA according to an embodiment of the present disclosure;

[0025] Figure 6 A block diagram configuration of a terminal according to an embodiment of the present disclosure is shown;

[0026] Figure 7 shows a block diagram configuration of a base station according to an embodiment of the present disclosure; and

[0027] Figure 8 is a flowchart illustrating a method of a terminal according to an embodiment of the present disclosure.

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

[0029] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details that aid in understanding, but these are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0030] 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 is apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0031] It should 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.

[0032] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements have the same reference numerals.

[0033] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will become apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the attached claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0034] Here, it will be understood that each block of the flowchart diagram and the combination of blocks in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions specified in the (multiple) flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce an article including an instruction device, which implements the functions specified in the (multiple) flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operations are performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide operations for implementing the functions specified in the (multiple) flowchart blocks.

[0035] In addition, each block of the flowchart diagram may represent a module, a code segment or a code portion, which includes one or more executable instructions for implementing (multiple) specified logical functions. It should also be noted that in some alternative embodiments, the functions mentioned in the blocks may not occur in order. For example, depending on the functions involved, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order.

[0036] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have a meaning limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into a smaller number of elements or "units", or divided into a larger number of elements or "units". In addition, elements and "units" may be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. In addition, "unit" in an embodiment may include one or more processors.

[0037] Hereinafter, the operating principle of the present disclosure will be described in detail in conjunction with the accompanying drawings. In the following description of the present disclosure, a detailed description of known functions or configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure quite unclear. The terms to be described below are defined in consideration of the functions in the present disclosure and may differ depending on the user, the user's intention or habit. Therefore, the definition of the terms should be based on the content of the entire specification.

[0038] In the following description, for the sake of convenience, terms used to identify access nodes, terms related to network entities, terms related to messages, terms related to interfaces between network entities, terms related to various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms related to subjects with equivalent technical meanings may be used.

[0039] In the following description, for ease of description, the present disclosure will be described using the terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard (the latest existing communication standard). 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. Specifically, the present disclosure can be applied to 3GPP New Radio (NR: 5G mobile communication standard) systems.

[0040] Figure 1 The structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure is shown.

[0041] refer to Figure 1, the wireless communication system includes a plurality of base stations 1-05, 1-10, 1-15 and 1-20, a mobility management entity (MME) 1-25 and a serving gateway (S-GW) 1-30. A user equipment (hereinafter, referred to as a UE or terminal) 1-35 accesses an external network through the base stations 1-05, 1-10, 1-15 and 1-20 and the S-GW 1-30.

[0042] Base stations 1-05, 1-10, 1-15 and 1-20 are access nodes of a cellular network and provide wireless access to terminals accessing the network. That is, base stations 1-05, 1-10, 1-15 and 1-20 collect status information such as the buffer status, available transmission power status and channel status of the terminal to perform scheduling, and support the connection between the terminal and the core network (CN), thereby serving the user's business. MME 1-25 is a device responsible for various control functions of the terminal and mobility management functions, and is connected to multiple base stations, while S-GW 1-30 is a device that provides data bearer. In addition, MME 1-25 and S-GW 1-30 can also perform authentication, bearer management, etc. on terminals accessing the network, and process packets arriving from base stations 1-05, 1-10, 1-15 and 1-20 or packets to be sent to base stations 1-05, 1-10, 1-15 and 1-20.

[0043] Figure 2 The wireless protocol structure of the LTE system according to the embodiment of the present disclosure is shown. The NR to be defined below may be partially different from the wireless protocol structure in the figure, but will be described for the convenience of describing the present disclosure.

[0044] refer to Figure 2In the wireless protocol of the LTE system, the terminal and the ENB include packet data convergence protocol (PDCP) 2-05 and 2-40, radio link control (RLC) 2-10 and 2-35, and medium access control (MAC) 2-15 and 2-30, respectively. The packet data convergence protocol (PDCP) 2-05 and 2-40 are responsible for operations such as IP header compression / decompression, and the radio link control (hereinafter, referred to as RLC) 2-10 and 2-35 reconfigures the PDCP packet data unit (PDU) with an appropriate size. The MAC 2-15 and 2-30 are connected to several RLC layer devices configured in one terminal, and perform operations of multiplexing RLC PDU into MAC PDU and demultiplexing RLC PDU from MAC PDU. The physical layers 2-20 and 2-25 perform operations of channel coding and modulating high-layer data into OFDM symbols to send OFDM symbols through a wireless channel, or perform operations of demodulating and channel decoding OFDM symbols received through a wireless channel to send the demodulated and channel-decoded OFDM symbols to a higher layer. In addition, even the physical layer uses hybrid automatic repeat request (HARQ) for additional error correction, and the receiving end sends whether the packet sent from the transmitting end is received through 1 bit. This is called HARQ ACK / NACK information. Downlink HARQ ACK / NACK information for uplink transmission can be sent through a physical hybrid-ARQ indicator channel (PHICH) physical channel, and uplink HARQ ACK / NACK information for downlink transmission can be sent through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) physical channel. PUCCH is not only used by the terminal to transmit HARQ ACK / NACK information to the base station, but also used by the terminal to transmit downlink channel status information (CSI) and scheduling request (SR) to the base station. When the terminal sends SR as 1-bit information to the resources within the PUCCH configured by the base station, the base station recognizes that the corresponding terminal has data to be sent to the uplink and allocates uplink resources. Through the uplink resources, the terminal can send a detailed buffer status report (BSR) message. The base station can allocate multiple SR resources to one terminal.

[0045] The physical layer (PHY) may include one or more frequencies / carriers, and the technology in which a base station configures and uses multiple frequencies simultaneously is called carrier aggregation (hereinafter referred to as "CA") technology. In CA technology, in addition to the main carrier, one or more secondary carriers are used for communication between the terminal (or user equipment (UE)) and the base station (or E-UTRAN NodeB (eNB)) instead of just one carrier, so as to greatly increase the transmission volume proportional to the number of secondary carriers. In LTE, the cell using the main carrier within the base station is called the primary cell (PCell), and the secondary carrier is called the secondary cell (SCell). The technology that extends CA functionality to two base stations is called dual connectivity (hereinafter referred to as "DC") technology. In the DC technology, the terminal simultaneously connects to and uses the primary base station (primary E-UTRAN NodeB, hereinafter referred to as "MeNB") and the secondary base station (secondary E-UTRAN NodeB, hereinafter referred to as "SeNB"), the cell belonging to the MeNB is called the primary cell group (hereinafter referred to as "MCG"), and the cell belonging to the SeNB is called the secondary cell group (hereinafter referred to as "SCG"). Each cell group has a representative cell, the representative cell of the primary cell group is called the primary cell (hereinafter referred to as "PCell"), and the representative cell of the secondary cell group is called the primary secondary cell (hereinafter referred to as "PSCell"). In the case of using the above-mentioned NR, the MCG uses LTE technology, and the SCG uses NR, so that the terminal can use LTE and NR at the same time. This is called E-UTRA-NR dual connectivity (EN-DC). On the contrary, a scenario in which the MCG uses NR technology and the SCG uses LTE technology can also be considered, which is called NR-E-UTRA dual connectivity (NE-DC). In addition, the technology in which both the MCG and the SCG use NR technology is called NR-NR dual connectivity (NR-DC).

[0046] Although not shown in the drawings, a radio resource control (hereinafter, referred to as "RRC") layer exists above the PDCP layer of the terminal and the base station, respectively, and the RRC layer can send or receive access and measurement-related configuration control messages for radio resource control. For example, a message of the RRC layer can be used to instruct the terminal to perform measurement, and the terminal can report the measurement result to the base station by using a message of the RRC layer.

[0047] At the same time, the transmission units of PCell and SCell can be the same or different. For example, in LTE, the transmission units of PCell and SCell can be the same, both are 1ms units, but in NR, the transmission unit (time slot) of PCell is 1ms, and the transmission unit of SCell can have a length of 0.5ms.

[0048] Table 1 below shows information on the available time slot length in each serving cell (i.e., PCell or SCell) according to the parameter set (or secondary carrier spacing) used by each serving cell in NR.

[0049] [Table 1]

[0050]

[0051] In addition, in LTE and NR, the following units are used in the frame structure in the radio interval (ie, between the base station and the terminal).

[0052] - Radio frame: The length is 10 ms and each radio frame is identified by a system frame number (SFN).

[0053] - Subframe: 1 ms in length, with a radio frame having 10 subframes. Subframes are identified by subframe numbers 0 to 9 within each radio frame.

[0054] -Time slot: has a length according to the value configured as shown in the table, and is a transmission unit used when the base station and the terminal transmit data.

[0055] Figure 3A and Figure 3B is a view for explaining a carrier aggregation (CA) technology in a terminal according to various embodiments of the present disclosure.

[0056] refer to Figure 3A and Figure 3B , in a base station, multiple carriers can usually be sent or received on several frequency bands. For example, in the prior art, when the base station 3-05 sends a carrier 3-15 with a center frequency of f1 and a carrier 3-10 with a center frequency of f3, a terminal sends or receives data by using one carrier between the two carriers. However, a terminal with carrier aggregation capability can send or receive data by using multiple carriers at the same time. The base station 3-05 can allocate more carriers to the terminal 3-30 with carrier aggregation capability according to the situation in order to increase the transmission rate of the terminal 3-30.

[0057] When a forward carrier and a reverse carrier sent and received by a base station form a cell, carrier aggregation can be understood as a terminal sending or receiving data simultaneously through multiple cells in the traditional sense. Through carrier aggregation, the maximum transmission rate increases proportionally with the number of aggregated carriers (or the number of serving cells).

[0058] In the following description of the present disclosure, a terminal receiving data through a forward carrier or transmitting data through a reverse carrier means the same as transmitting or receiving data through a control channel and a data channel provided from a cell corresponding to a center frequency and a frequency band characterizing a carrier.

[0059] For CA configuration (or for handover to a neighboring base station, etc.), the terminal may receive a measurement configuration from the base station to report the results obtained by measuring the neighboring cells. Therefore, the terminal may perform measurements according to the measurement configuration received from the base station and report the performed measurement results to the base station. The measurement configuration may include detailed information about the frequency to be measured and the conditions for reporting the measurement, and additionally include information about the measurement gap for the terminal to measure another frequency. Therefore, when the measurement gap is configured for the terminal, a periodic measurement gap may be allocated to the terminal according to the configured information. Therefore, in order to measure the frequency, the measurement corresponding to the measurement gap is configured, and the terminal does not perform the following operations on the current base station (or (multiple) serving cells using the frequency related to the measurement).

[0060] -PUCCH transmission (HARQ ACK / NACK, SR, CSI)

[0061] -SRS transmission

[0062] -PDCCH monitoring and data reception, wherein, however, when the terminal is required to receive RAR or identify whether Msg3 transmission is successful, the terminal performs PDCCH monitoring and data reception.

[0063] -Data transmission, wherein, however, when random access is being performed, Msg3 transmission for performing random access needs to be performed.

[0064] In addition, the terminal can perform data transmission / reception with the base station in an interval excluding the above-mentioned measurement gap. In NR, when the operating frequency is 410MHz to 7125MHz (refer to Rel-15 as NR version information), this is called frequency range 1 (FR1), and when the operating frequency is 24250MHz to 52600MHz, this is called frequency range 2 (FR2). Therefore, if the measurement gap is configured for FR1 measurement, the terminal does not perform the above operation in the (multiple) service cells using the FR1 frequency, and the terminal can perform the above operation in the (multiple) service cells using the FR2 frequency. For example, if the measurement gap is configured for FR2 measurement, the terminal does not perform the above operation in the (multiple) service cells using the FR2 frequency, and the terminal can perform the above operation in the (multiple) service cells using the FR1 frequency. If the measurement gap is not limited to FR1 and FR2, but is configured for all frequency ranges of the terminal, the terminal does not perform the above operation in all (multiple) service cells during the measurement gap.

[0065] The measurement gap has a periodic measurement gap as described above, and may have a periodic measurement gap starting from the SFN of a specific cell among the reference base stations. This is because, as described above, since the terminal does not perform the above operation during the measurement gap, the terminal and the base station are required to have the same understanding of the measurement gap. At the same time, MCG and SCG may use different SFNs. In addition, a scenario can be assumed in which FR1 and FR2 use different SFNs, even within MCG or SCG. In this case, the base station may implicitly or explicitly indicate to the terminal the cell whose SFN is to be referenced to configure the measurement gap.

[0066] For example, in the case of the above-mentioned EN-DC, the base station and the terminal can implicitly determine the reference cell of the measurement gap without a separate explicit indicator. For example, in the case of the measurement gap of FR1, the terminal can refer to the SFN and subframe boundary of the PCell to identify the starting point and period of the measurement gap. In the case of the measurement gap of FR2, the terminal can refer to the SFN and subframe boundary of one of the serving cells operating in FR2 of (NR SCG) to identify the starting point and period of the measurement gap.

[0067] On the other hand, in the case of NE-DC or NR-DC, when the base station configures the measurement gap for the terminal, the base station can indicate the cell whose SFN is to be used to configure the measurement gap by using an explicit indicator. As an explicit indicator, a field such as refServCellIndicator can be used, and refServCellIndicator can indicate a value among pCell, pSCell, and mcg-FR2, thereby indicating one of the service cells using FR2 to be used as a reference among the service cells of PCell, PSCell, or MCG. In addition, considering the case where MCG uses FR1 and FR2 and SCG uses FR1 and FR2 in NR-DC, it is possible to consider further extending the scenario of refServCellIndicator, and for this purpose, refServCellIndicatorExt can be introduced to indicate scg-FR2. Alternatively, in order to configure the measurement gap with reference to the SFN and subframe boundary of a specific service cell within the MCG or SCG, a scenario in which the identifier of the serving cell (ServCellIndex) is additionally indicated as refServCellIndicator can be considered. In this case, (considering the case where the main scenario is FR2), a field such as refServCellIndicatorFR2 may be newly defined, which is another extended version of refServCellIndicator, and a corresponding field may be defined to indicate the identifier of the serving cell. Therefore, when the measurement gap is configured for the terminal, the terminal may determine the cell to which the measurement gap is to be configured with reference to its SFN and subframe boundary. For example, the terminal may identify the configured measurement gap by using the SFN and subframe of the serving cell of the FR2 frequency indicated by the newly defined field (such as refServCellIndicatorFR2).

[0068] When using CA technology in the NR system, for each serving cell, frequency division duplex (FDD) (transmission using downlink and uplink at different frequencies) or time division duplex (TDD) (transmission divided in time in downlink and uplink at the same frequency) can be selectively used according to the situation of the base station and the service provider.

[0069] Specifically, Figure 3BAs shown, when TDD technology is used in adjacent frequencies (e.g., reference numerals 3-71 and 3-73; or reference numerals 3-75 and 3-77), it is necessary to use the TDD pattern (distribution configuration of downlink (D) and uplink (U)) in the same manner. When the downlink time point and the uplink time point overlap at the adjacent frequency, since the downlink signal of the base station (e.g., a base station that sends a relatively stronger signal than the terminal) interferes with the uplink of the adjacent frequency, communication may become difficult due to the interference effect in the corresponding uplink. To this end, as shown in the figure, the TDD patterns of service provider A and service provider B are the same (e.g., reference numerals 3-71 and 3-73), and the TDD patterns of service provider A and service provider C are the same (e.g., reference numerals 3-75 and 3-77). At the same time, in this example, a scenario in which service provider A uses two carriers 3-73 and 3-75 through CA can be considered. In this case, since the desired TDD pattern has been used without a separate agreement between service providers B and C, the pattern between the two carriers 3-73 and 3-75 owned by service provider A may be different.

[0070] In the NR system, when a TDD pattern is configured for a terminal, the format of the pattern can be configured from the downlink as follows.

[0071] For example, the pattern of service provider B is a repeating pattern of pattern 1 having three DL 3-81 and two UL 3-83 time slots and pattern 2 having two DL 3-85 and three UL 3-87 time slots. In addition, the pattern of service provider C is a repeating pattern of pattern 1 having four DL and one UL time slots and pattern 2 having three DL and two UL time slots.

[0072] Table 2 below shows the message format used when the base station configures the TDD pattern of each service cell in the NR system to the terminal. For example, the message format is the existing TDD pattern message format. According to the existing TDD pattern message format, starting from the start time points 3-50 and 3-60 of the frame, the TDD pattern is configured in the order of downlink time slots (nrofDownlinkSlots) and downlink symbols (nrofDownlinkSymbols), and conversely, starting from the last position of the corresponding pattern, the TDD pattern is configured in the order of uplink time slots (nrofUplinkSlots) and uplink symbols (nrofUplinkSymbols). Therefore, the entire sequence is defined as downlink time slots (nrofDownlinkSlots), downlink symbols (nrofDownlinkSymbols), uplink symbols (nrofUplinkSymbols) and uplink time slots (nrofUplinkSlots).

[0073] [Table 2]

[0074]

[0075] According to the format shown in Table 2 above, when service provider A intends to configure the service cell indicated by reference numeral 3-73 as the SCell of the terminal by using the service cell indicated by reference numeral 3-75 as the PCell, there is a problem in that the TDD pattern (starting from the uplink time slot) of the service cell indicated by reference numeral 3-73 cannot be configured by using the current signaling structure.

[0076] In order to solve this problem, a method for changing the TDD configuration method may be considered. For example, the method includes a method for additionally signaling an offset of a time slot according to referenceSubcarrierSpacing and according to the above-mentioned secondary carrier spacing by adding patternOffset to a message configured by a base station to a terminal, as described below. For example, in Figure 3B In the case of reference numeral 3-73 of the example, patternOffset can be signaled in two time slots to inform the service provider that the pattern itself needs to be moved by two time slots. The base station can signal the offset of the cell indicated by reference numeral 3-73 and configured as the SCell in the terminal to the terminal. As the unit of patternOffset, a time slot unit is shown in this example, but a symbol unit or a subframe unit may be used.

[0077] Table 3 below shows Example 1 of the new TDD pattern message format.

[0078] [Table 3]

[0079]

[0080] In another embodiment, when an offset occurs as described above, for the case where the uplink time slot is located first, a method for notifying the number of uplink time slots (nrofStartingUplinkSlots) existing from the starting point of the corresponding SCell relative to the PCell may also be considered. The message format showing the above content is shown in Table 4.

[0081] For example, Table 4 shows Example 2 of the new TDD pattern message format.

[0082] [Table 4]

[0083]

[0084] Another embodiment provides a method for adding 1 bit of information (reverse) to generate a new pattern starting from an uplink slot instead of a downlink slot. Specifically, the method is a method for changing the order to uplink slots (nrofDownlinkSlots), uplink symbols (nrofDownlinkSymbols), downlink symbols (nrofUplinkSymbols) and downlink slots (nrofUplinkSlots) instead of the above order of downlink slots (nrofDownlinkSlots), downlink symbols (nrofDownlinkSymbols), uplink symbols (nrofUplinkSymbols) and uplink slots (nrofUplinkSlots) when including a reverse field.

[0085] For example, Table 5 shows Example 3 of the new TDD pattern message format.

[0086] [Table 5]

[0087]

[0088] In the above example, a scheme for configuring a new TDD pattern for each serving cell so as not to affect other existing operations (collectively referred to as scheme A) is described. However, as another embodiment, a method for allocating time slot numbers differently for each serving cell (scheme B) may be considered. For example, in the above embodiment, the time slot numbers of the PCell and SCell at the same time point are the same. However, when the time slot numbers differ by two time slots, such as Figure 3BAs shown, a time slot number having the same difference as the difference between the SFN start time points can be assigned to the serving cell. For example, when the time slot number of carrier 3-75 increases (such as 0, 1, 2, ...), a method for using time slot numbers that differ by two time slots at the same time point (such as [maximum time slot number per frame -2], [maximum time slot number per frame -1], 0, 1, 2, ...) can be considered for carrier 3-73. For example, for each SCell, in addition to the TDD pattern information configured for each SCell, a time slot number is assigned to each serving cell by using the SFN / time slot number corrected by the time slot offset signaled for each SCell. As in the first embodiment of scheme A, the time slot offset in scheme B can be determined in units of time slots according to the secondary carrier interval of the SCell, and can have a value of the number of time slots from 0 to N or from -N / 2 to N / 2 (N is an integer, for example, the maximum number of time slots in a frame). Therefore, the terminal can determine that the time slot 0 of the SCell starts at a point that is spaced apart from the time slot 0 of the PCell by an amount equal to the time slot offset * time slot length of the SCS corresponding to the SCell. Alternatively, the terminal can determine that the time slot 0 of the SCell starts at a point that is spaced apart by an amount equal to the time slot offset * time slot length of the secondary carrier spacing corresponding to the PCell. In the case of scheme B, various operations using time slot numbers may be affected.

[0089] For example, in the case of discontinuous reception (DRX) described below, it is necessary to determine the time slot number used as a reference time point of the SFN to which the DRX cycle is allocated. As an example, the time slot number can be determined with reference to time slot number 0 and the SFN of the PCell.

[0090] In addition, there are two types of "Configuration Uplink Grant", which is used to make periodic allocation without sending a physical downlink control channel (hereinafter referred to as "PDCCH") for sending downlink and uplink scheduling information. Specifically, Type 1 is a scheme in which both the starting time point and the period are configured in the RRC layer, and Type 2 is a scheme in which only the period is configured in the RRC layer, and then the uplink configured by the PDCCH message is "activated". (Once the uplink is activated, the uplink can be sent according to the period configured by the RRC without PDCCH.) In this case, since the starting time point is configured in Type 1, there is a problem with the reference for interpreting the time slot number. Therefore, the configuration uplink of the PCell is determined with reference to the SFN, time slot number or symbol number of the PCell, and if no additional time slot offset is configured, the configuration uplink of the SCell can be defined as starting with reference to the PCell, and if the time slot offset is configured for the corresponding SCell, it starts with reference to the adjusted SFN / time slot number.

[0091] In addition, in the case of activating the SCell configured by the message of the RRC layer for actual use and then deactivating the SCell, the MAC control element (CE) as the control message of the MAC layer can indicate the activation and deactivation of a specific SCell (SCell activation / deactivation MAC CE), and since the terminal that has received the MAC CE cannot be activated and deactivated immediately, when the MAC CE is received in the n time slot, the corresponding operation is performed in the n+k time slot. If the time slot number is different, as shown in scheme B, the starting time point also needs to be adjusted, as summarized in the following Table 6.

[0092] [Table 6]

[0093]

[0094] Regardless of the cell that has received the MAC CE and the cell to be activated, the cell can always be unconditionally activated at the time point n+k of the reference PCell.

[0095] Figure 4 It is a view for explaining the above-mentioned discontinuous reception (hereinafter, referred to as 'DRX') operation of the terminal according to an embodiment of the present disclosure.

[0096] refer to Figure 4, DRX is a technology for monitoring only some physical downlink control channels (hereinafter referred to as "PDCCH") according to the above configuration information, instead of monitoring all PDCCHs, so as to obtain scheduling information according to the configuration of the base station, thereby minimizing the power consumption of the terminal. The basic DRX operation has a DRX cycle 4-00, and monitors the PDCCH only during the on-duration 4-05 time. In connected mode, the DRX cycle is configured as two values ​​of long DRX and short DRX. Generally, a long DRX cycle is applied, and if necessary, the base station can additionally configure a short DRX cycle. If a long DRX cycle and a short DRX cycle are configured, the terminal starts a short DRX timer and repeats from the short DRX cycle. If there is no new traffic until after the short DRX timer expires, the terminal changes the cycle from the short DRX cycle to the long DRX cycle. If during the on-duration 4-05 time, scheduling information related to a new packet is received via the PDCCH (operation 4-10), the terminal starts a DRX inactive timer (operation 4-15). The terminal remains active during the DRX inactive timer. For example, the terminal continues to perform PDCCH monitoring. In addition, the terminal also starts a HARQ round trip time (RTT) timer (operation 4-20). The HARQ RTT timer can be used to prevent the terminal from unnecessarily monitoring the PDCCH during the HARQ round trip time (RTT). Therefore, during the timer operation time, the terminal does not need to perform PDCCH monitoring. However, when the DRX inactive timer and the HARQ RTT timer operate simultaneously, the terminal continues to perform PDCCH monitoring based on the DRX inactive timer. When the HARQ RTT timer expires, the DRX retransmission timer starts (operation 4-25). When the DRX retransmission timer operates, the terminal is required to perform PDCCH monitoring. Typically, during the DRX retransmission timer operation time, scheduling information for HARQ retransmission is received (operation 4-30). When the scheduling information is received, the terminal immediately stops the DRX retransmission timer and starts the HARQ RTT timer again. The above operation continues until the packet is successfully received (operation 4-35).

[0097] As described above, in the case where at least two cells in CA have different frame start points (for example, the case where the frame start points are different, the case where the frame start points are not aligned, and the case where the frame boundaries are not aligned), in DRX, it is necessary to determine the cell whose time slot number is to be referenced to be used as the reference time point of the SFN to which the DRX cycle is allocated. According to an embodiment, the cell may be determined with reference to the time slot number 0 and the SFN of the PCell.

[0098] Therefore, the terminal can determine the DRX duration, which is an interval for maintaining an active state during the DRX inactivity timer, by using the SFN of the PCell.

[0099] Figure 5 is a flowchart illustrating an operation sequence of a terminal when operating by configuring serving cells having different frame timings using CA according to an embodiment of the present disclosure.

[0100] refer to Figure 5 In the flowchart, it is assumed that the terminal is in a connected mode (RRC_CONNECTED) state, in which data transmission / reception can be performed by establishing a connection to a base station (operation 5-01).

[0101] Thereafter, the terminal may report the capabilities of the terminal to the base station (operation 5-03). The terminal may report the capabilities of the terminal through the terminal's capability information. The terminal may have different frame starting points, such as Figure 3B For example, when at least two cells are configured by using CA, the terminal may report to the base station that the terminal may support having different frame start points for at least two cells.

[0102] The capability may be a capability available in all frequency bands supported by the terminal, or may be a capability available only in a specific frequency band. In the former case, the corresponding capability may be sent in 1 bit in the capability information of the terminal, but in the latter case, it may be reported whether each frequency band or a combination of each frequency band may have a different frame starting point.

[0103] Thereafter, the terminal may receive an RRCReconfiguration message of the RRC layer from the base station (operation 5-05). The RRCReconfiguration message may be used when configuring various configuration information for the terminal. For example, in the case of adding to the additional use of SCell as described above, configuration information related thereto may be included. Configuration information such as the time slot offset required for the above-mentioned schemes A and B may be included in the message of the RRC layer. The various message formats when describing scheme A are information included in the RRCReconfiguration message.

[0104] When according to information usage scheme A (operation 5-07), when calculating the above-mentioned DRX, configured uplink allocation information, and SCell activation and deactivation time points, the terminal can perform corresponding operations (operation 5-11) by applying the same time slot number and SFN as PCell.

[0105] However, when using solution B (operation 5-07), the terminal can apply the configuration information of the corresponding SCell as follows: Figure 3BThe operation (operation 5-13) is performed based on the time slot number and SFN corrected for the described time slot offset.

[0106] In addition, a scenario in which the measurement gap is configured through an RRCReconfiguration message may be considered. In more detail, the base station may configure the following parameters related to the measurement gap.

[0107] - Gap type (e.g., gapUE, gapFR1, and gapFR2)

[0108] - Information about the start point and period of the measurement gap in the gap type

[0109] - The reference indicator of the measurement gap (refServCellIndicator or refServCellIndicatorExt)

[0110] When the above-mentioned scheme B is used, in the case where the SFN and the subframe boundary are determined by using one of several serving cells (such as mcg-FR2 and scg-FR2) using FR2, the SFN starting point can be changed for each serving cell. To this end, the terminal can select a serving cell among the corresponding serving cells (for example, among the serving cells using FR2) among the cells whose SFN is not corrected by the time slot offset in order to determine the position of the measurement gap. Alternatively, as described above, when the base station configures the measurement gap, a specific serving cell identifier (ServCellIndex) is indicated so that the terminal can determine the measurement gap with reference to the SFN and the subframe boundary of the corresponding serving cell. Therefore, even when the SFN of each serving cell changes, the terminal can determine the measurement gap with reference to a specific serving cell (for example, a serving cell to which the time slot offset is not applied in PCell, PSCell or mcg-FR2 / scg-FR2, or a specific serving cell indicated by the base station), and measure the neighboring cells during the measurement gap at the same timing as the base station.

[0111] In more detail, when the gap type configured by the base station is gapFR2 and one of refServCellIndicator and refServCellIndicatorExt is configured, if the corresponding configuration content is related to PCell or PSCell, the terminal uses the corresponding cell as the reference cell for the measurement gap. However, in the case of mcg-FR2 or scg-FR2, when scheme B is used, the terminal uses one of the service cells using FR2 to which the offset is not applied as the reference cell for the measurement gap. Alternatively, as another method, the terminal may use the service cell with the lowest ServCellIndex among the corresponding service cells. Alternatively, as described above, the terminal receives a specific ServCellIndex (having a unique value in the entire MCG and SCG) indicated by the base station and uses the indicated service cell as the reference cell for the measurement gap.

[0112] When the gap type configured by the base station is gapFR2, if refServCellIndicator and refServCellIndicatorExt are not configured, the terminal uses the serving cell that meets the predetermined conditions (for example, no time slot offset is configured or has the lowest ServCellIndex) among the FR2 serving cells as the reference cell for the measurement gap.

[0113] When the gap type configured by the base station is gapFR1 or gapUE, if refServCellIndicator is configured, the terminal uses the serving cell indicated in PCell and PSCell, and if refServCellIndicator is not configured, PCell is always used as the reference cell for the measurement gap.

[0114] Alternatively, in the case where the gap type configured by the base station is gapFR1 or gapUE, the base station can configure a specific SCell (using FR1) as the reference cell for the measurement gap for the terminal by configuring a separate parameter such as refServCellIndicatorExtFR1 to indicate one of the SCells in FR1 used by the base station. This is because even when CA is configured using only FR1 used by the base station, the subcarrier spacing (SCS) used within CA may be different (for example, 15kHz for PCell and 30kHz for SCell). For example, in the above example, since the time slot gap of SCell is shorter than the time slot gap of PCell (one time slot is 1ms for PCell and 0.5ms for SCell), the base station can determine the reference cell for the measurement gap with reference to the SCell indicated by refServCellIndicatorExtFR1, so as to configure the measurement gap of the terminal in more detail even for FR1.

[0115] In addition, thereafter (or through the above RRCReconfiguration message), the terminal may receive DRX configuration from the base station. The DRX configuration includes timers required for DRX driving, and each timer and the time unit of each timer are as follows.

[0116] - OnDuration timer: set to the number of time slots in the reference cell

[0117] - Short DRX cycle: set to the number of slots in the reference cell (or set to the number of subframes)

[0118] - Short DRX cycle timer: set to the number of slots in the reference cell

[0119] - Long DRX cycle: set to the number of time slots in the reference cell (or set to the number of subframes)

[0120] -DRX Inactivity Timer: set to the number of slots in the reference cell

[0121] -HARQ RTT timer: set to the number of time slots for performing transmission / retransmission in the corresponding cell

[0122] -DRX retransmission timer: set to the number of time slots for performing transmission / retransmission in the corresponding cell

[0123] The time slot of the reference cell may be the time slot of the PCell, or the time slot of a cell having the longest transmission unit among all serving cells (ie, PCell and SCell).

[0124] Therefore, the terminal can repeat the corresponding cycle according to the configured cycle and monitor the PDCCH during the on-duration period. When there is new data transmission in the on-duration period, the terminal can drive the DRX inactive timer at the time point when the on-duration period ends, and drive the HARQ RTT timer when receiving new data transmission. When the terminal receives new data transmission in the above-mentioned active time interval, the terminal can perform the above-mentioned operation. In addition, when no packet is successfully received until the HARQ RTT timer expires, the terminal can drive the DRX retransmission timer to monitor the retransmitted PDCCH from the base station. When the packet is successfully received before the HARQ RTT timer expires, the terminal no longer drives the DRX retransmission timer. When both the long DRX cycle and the short DRX cycle are configured as described above, the terminal starts the short DRX timer and repeats from the short DRX cycle, and when there is no new traffic until after the short DRX timer expires, the terminal changes the short DRX cycle to the long DRX cycle. Thereafter, when new traffic occurs, the terminal can use the short DRX cycle again and repeat the above process (operation 5-05).

[0125] Figure 6 A block diagram configuration of a terminal according to an embodiment of the present disclosure is shown.

[0126] refer to Figure 6 , the terminal may include a radio frequency (RF) processor 6-10, a baseband processor 6-20, a storage device 6-30, and a controller 6-40.

[0127] The RF processor 6-10 can perform functions such as frequency band conversion and amplification of signals for transmitting or receiving signals via a wireless channel. For example, the RF processor 6-10 up-converts the baseband signal provided by the baseband processor 6-20 into an RF band signal, then transmits the RF band signal via an antenna, and down-converts the RF band signal received via the antenna into a baseband signal. The RF processor 6-10 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. Figure 6 In the embodiment, only one antenna is shown, but the terminal may include multiple antennas. In addition, the RF processor 6-10 may include multiple RF chains. In addition, the RF processor 6-10 may perform beamforming. For beamforming, the RF processor 6-10 may adjust the phase and size of each signal sent or received via multiple antennas or antenna elements.

[0128] The baseband processor 6-20 can perform the conversion function between the baseband signal and the bit stream according to the physical layer specification of the system. For example, when data is sent, the baseband processor 6-20 can generate complex symbols by encoding and modulating the transmission bit stream. In addition, when data is received, the baseband processor 6-20 can demodulate and decode the baseband signal provided from the RF processor 6-10 to recover the received bit stream. For example, when data is sent according to the orthogonal frequency division multiplexing (OFDM) scheme, the baseband processor 6-20 can generate complex symbols by encoding and modulating the transmission bit stream, and map the complex symbols to subcarriers, and then configure the OFDM symbols through the inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion. In addition, when data is received, the baseband processor 6-20 can divide the baseband signal provided from the RF processor 6-10 into OFDM symbol units, and recover the signal mapped to the subcarrier through the fast Fourier transform (FFT) operation, and then recover the received bit stream through demodulation and decoding.

[0129] The baseband processor 6-20 and the RF processor 6-10 can send and receive signals as described above. Therefore, the baseband processor 6-20 and the RF processor 6-10 can be referred to as a transmitter, a receiver, a transceiver, or a communicator. In addition, at least one of the baseband processor 6-20 and the RF processor 6-10 may include different communication modules to process signals of different frequency bands. Different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz and 5 GHz) bands and millimeter wave (e.g., 60 GHz) bands.

[0130] The storage device 6 - 30 may store data such as basic programs, application programs, and configuration information for terminal operations.

[0131] The controller 6-40 may control the overall operation of the terminal. For example, the controller 6-40 sends or receives signals through the baseband processor 6-20 and the RF processor 6-10. In addition, the controller 6-40 records data on the storage device 6-30 and reads data from the storage device 6-30. To this end, the controller 6-40 may include at least one processor. For example, the controller 6-40 may include a communication processor (CP) that performs communication control, and an application processor (AP) that controls a higher layer such as an application. According to an embodiment, the controller 6-40 includes a multi-connection processor 6-42 that executes a process for operating in a multi-connection mode. For example, the controller 6-40 may control the terminal to perform Figure 6 The process shown in the terminal operation shown.

[0132] For example, the controller 6-40 can control the transceiver to send a first message including capability information indicating whether the terminal supports carrier aggregation operations in which the frame boundaries of the first cell and the second cell are not aligned, and receive a second message including time slot offset information between the first cell and the second cell.

[0133] In addition, in the case where the frame boundaries of the first cell and the second cell are not aligned, the controller 6-40 may control to determine the time offset of the second cell based on the first cell according to the time slot offset information.

[0134] According to an embodiment, when the base station configures a timeslot offset for the terminal, the terminal may determine downlink and uplink timeslots to perform reception and transmission.

[0135] Figure 7 The structure of a base station according to an embodiment of the present disclosure is shown.

[0136] refer to Figure 7 , the base station may include a transceiver 710, a controller 720, and a storage device 730. In the present disclosure, the controller may be defined as a circuit, an application specific integrated circuit, or at least one processor.

[0137] The transceiver 710 may send or receive signals to or from other network entities. For example, the transceiver 710 may send a message to a terminal.

[0138] According to the embodiments proposed in the present disclosure, the controller 720 may control the overall operation of the base station. For example, the controller 720 may control the signal flow between blocks in order to perform the above operations.

[0139] For example, the controller 720 can control the transceiver to receive a first message including capability information indicating whether the terminal supports carrier aggregation operations in which the frame boundaries of the first cell and the second cell are not aligned, and send a second message including time slot offset information between the first cell and the second cell.

[0140] In addition, the controller 720 may control the transceiver to transmit an indicator of a serving cell for configuring a measurement gap in case of asynchronous carrier aggregation (CA) involving at least one frequency range 2 (FR2) carrier.

[0141] The storage device 730 may store at least one of information transmitted or received by the transceiver 710 and information generated by the controller 720. For example, the storage device 730 may store capability information of a terminal received from the terminal, SCell configuration information transmitted to the terminal, slot offset information, and the like.

[0142] Figure 8 is a flowchart illustrating a method of a terminal according to an embodiment of the present disclosure.

[0143] refer to Figure 8 First, at operation 810, the terminal may send a first message including capability information indicating whether the terminal supports a carrier aggregation operation in which frame boundaries of a first cell and a second cell are not aligned.

[0144] At operation 820, the terminal may receive a second message including time slot offset information between the first cell and the second cell.

[0145] At operation 830, in a case where the frame boundaries of the first cell and the second cell are not aligned, the terminal may determine a time offset of the second cell based on the first cell according to the time slot offset information.

[0146] The methods disclosed in the claims and / or the methods according to the various embodiments described in the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0147] When these methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. The at least one program may include instructions for causing an electronic device to perform methods according to various embodiments of the present disclosure as defined by the appended claims and / or disclosed herein.

[0148] Programs (software modules or software) can be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, compact disk ROM (CD-ROM), digital versatile disk (DVD) or other types of optical storage devices or tapes. Alternatively, any combination of some or all of them can form a memory for storing programs. In addition, multiple such memories may be included in the electronic device.

[0149] In addition, the program can be stored in an attachable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area LAN (WLAN), and a storage area network (SAN) or a combination thereof. Such a storage device can access the electronic device via an external port. In addition, an independent storage device on a communication network can access the portable electronic device.

[0150] While the present 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 without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: sending a first message, the first message including capability information indicating whether the terminal supports a carrier aggregation operation in which frame boundaries of the first cell and the second cell are not aligned; receiving a second message, wherein the second message includes time slot offset information between the first cell and the second cell; In a case where frame boundaries of the first cell and the second cell are not aligned, determining a time offset of the second cell based on the first cell according to the time slot offset information, receiving an identifier of a serving cell for configuring measurement gaps in case of asynchronous carrier aggregation (CA) involving at least one frequency range 2 FR2 carrier, and The measurement gap is determined based on a system frame number SFN and a subframe of a serving cell indicated by the received identifier of the serving cell.

2. The method according to claim 1, further comprising: in, The SFN of the serving cell is used to configure the uplink grant, and The first cell is a primary cell pcell, and the second cell is at least one secondary cell scell.

3. A method performed by a base station in a wireless communication system, the method comprising: receiving a first message, the first message including capability information indicating whether the terminal supports a carrier aggregation operation in which frame boundaries of a first cell and a second cell are not aligned; determining a second message, wherein the second message includes time slot offset information between the first cell and the second cell; sending the second message, Wherein, when frame boundaries of the first cell and the second cell are not aligned, the time offset of the second cell based on the first cell is determined according to the time slot offset information, and sending an identifier of a serving cell for configuring measurement gaps in case of asynchronous carrier aggregation (CA) involving at least one frequency range 2 FR2 carrier, The measurement gap is determined based on a system frame number SFN and a subframe of a serving cell indicated by the received identifier of the serving cell.

4. The method according to claim 3, further comprising: in, The SFN of the serving cell is used to configure the uplink grant, and The first cell is a primary cell pcell, and the second cell is at least one secondary cell scell.

5. A terminal in a wireless communication system, the terminal comprising: Transceiver; and At least one processor configured to: controlling the transceiver to send a first message including capability information indicating whether the terminal supports a carrier aggregation operation in which frame boundaries of a first cell and a second cell are not aligned, and receiving a second message including time slot offset information between the first cell and the second cell, and In a case where frame boundaries of the first cell and the second cell are not aligned, determining a time offset of the second cell based on the first cell according to the time slot offset information, Wherein, the at least one processor is further configured to: receiving, via the transceiver, an identifier of a serving cell for configuring measurement gaps in case of asynchronous carrier aggregation (CA) involving at least one frequency range 2 FR2 carrier, and The measurement gap is determined based on a system frame number SFN and a subframe of a serving cell indicated by the received identifier of the serving cell. The terminal according to claim 5, wherein: The SFN of the serving cell is used to configure the uplink grant.

7. The terminal according to claim 5, wherein: The first cell is a primary cell pcell, and the second cell is at least one secondary cell scell.

8. A base station in a wireless communication system, the base station comprising: Transceiver; and At least one processor configured to: controlling the transceiver to receive a first message, the first message including capability information indicating whether the terminal supports a carrier aggregation operation in which frame boundaries of the first cell and the second cell are not aligned, determining a second message, the second message comprising time slot offset information between the first cell and the second cell, and controlling the transceiver to send the second message, Wherein, when frame boundaries of the first cell and the second cell are not aligned, the time offset of the second cell based on the first cell is determined according to the time slot offset information, Wherein, the at least one processor is further configured to: sending, via the transceiver, an identifier of a serving cell for configuring measurement gaps in case of asynchronous carrier aggregation (CA) involving at least one frequency range 2 FR2 carrier, The measurement gap is determined based on a system frame number SFN and a subframe of a serving cell indicated by the received identifier of the serving cell.

9. The base station according to claim 8, in, The SFN of the serving cell is used to configure the uplink grant.

10. The base station according to claim 8, wherein: The first cell is a primary cell pcell, and the second cell is at least one secondary cell scell.

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