CN113632515A

CN113632515A - Method and apparatus for configuring carrier aggregation for serving cells having different starting time points in a frame in a wireless communication system

Info

Publication number: CN113632515A
Application number: CN202080024822.7A
Authority: CN
Inventors: 张宰赫; 金成勋; A.阿吉瓦尔
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2019-10-02
Filing date: 2020-09-28
Publication date: 2021-11-09
Also published as: EP3881626A4; KR20210039937A; EP3881626A1

Abstract

The present disclosure relates to a communication method and system for merging a fifth generation (5G) communication system for supporting higher data rates beyond fourth generation (4G) systems with internet of things (IoT) technology. The present disclosure may be applied to intelligent services based on 5G communication technologies and IoT related technologies, such as smart homes, smart buildings, smart cities, smart cars, networked cars, healthcare, digital education, smart retail, security and security services. According to the present disclosure, a base station may configure serving cells having different frame start time points using Carrier Aggregation (CA) for the operation of a terminal, and thus may increase a transmission rate of the terminal.

Description

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

Technical Field

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

In order to meet the increasing demand for wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Accordingly, the 5G or pre-5G communication system is also referred to as a "super 4G network" or a "post-LTE system". The 5G communication system is considered to be implemented in a frequency band of higher frequencies (millimeter waves), for example, a 60GHz band, in order to achieve a higher data rate. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, massive antenna techniques are discussed in the 5G communication system. Further, in the 5G communication system, development of system network improvement is being performed based on advanced small cells, cloud Radio Access Network (RAN), ultra dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multipoint (CoMP), reception-side interference cancellation, and the like. In 5G systems, hybrid FSK and QAM modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and Sparse Code Multiple Access (SCMA) as advanced access techniques.

The internet, which is a human-centric network-connected internet in which humans generate and consume information, is now evolving towards the internet of things (IoT) in which distributed entities, such as things, exchange and process information without human intervention. Internet of everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection with a cloud server. As IoT implementations require 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 recently been studied. Such an IoT environment can provide intelligent internet technology services, creating new value for human life by collecting and analyzing data generated between interconnected things. IoT can be applied in various fields including smart homes, smart buildings, smart cities, smart cars or networked cars, smart grids, healthcare, smart homes, and advanced medical services through the fusion and combination between existing Information Technology (IT) and various industrial applications.

In line with this, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, Machine Type Communication (MTC), and machine-to-machine (M2M) communication may be implemented through beamforming, MIMO, and array antennas. The application of cloud Radio Access Network (RAN) as the big data processing technology described above may also be considered as an example of the convergence between 5G technology and IoT technology.

Meanwhile, a method for configuring Carrier Aggregation (CA) for serving cells having different frame start time points is required.

The above information is provided as background information only to aid in understanding the present disclosure. No determination is made as to whether any of the above is applicable as prior art with respect to the present disclosure, nor is an assertion made.

Disclosure of Invention

Technical problem

Aspects of the present disclosure are directed to solving at least the above problems and/or disadvantages and to providing at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide a method for configuring serving cells having different frame start time points using Carrier Aggregation (CA).

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.

Problem solving scheme

According to an aspect of the present disclosure, a method of a terminal in a wireless communication system is provided. The method comprises the following steps: transmitting a 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 including slot offset information between the first cell and the second cell; and under the condition that the frame boundaries of the first cell and the second cell are not aligned, determining the time offset of the second cell based on the first cell according to the time slot offset information.

According to another aspect of the present disclosure, a method of a base station in a wireless communication system is provided. The method comprises the following steps: receiving a 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; determining a second message including slot offset information between the first cell and the second cell; and transmitting a second message, wherein the time offset of the second cell based on the first cell is determined according to the time slot offset information under the condition that the frame boundaries of the first cell and the second cell are not aligned.

According to another aspect of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver and at least one processor configured to control the transceiver to transmit 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 receive a second message including slot offset information between the first cell and the second cell, and determine a first cell-based time offset of the second cell according to the slot offset information in case the frame boundaries of the first cell and the second cell are not aligned.

According to another aspect of the present disclosure, a base station in a wireless communication system is provided. The base station includes a transceiver and at least one processor configured to control the transceiver to receive a 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 including slot offset information between the first cell and the second cell, and control the transceiver to transmit the second message, wherein a first cell based time offset of the second cell is determined according to the slot offset information in a case where the frame boundaries of the first cell and the second cell are not aligned.

Advantageous effects of the invention

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

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.

Drawings

The above and other aspects, features and advantages of particular embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings in which:

fig. 1 illustrates a structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure;

fig. 2 illustrates a radio protocol structure of an LTE system according to an embodiment of the present disclosure;

fig. 3A is a view for explaining a Carrier Aggregation (CA) technique in a terminal according to an embodiment of the present disclosure;

fig. 3B is a view for explaining a Carrier Aggregation (CA) technique in a terminal according to an embodiment of the present disclosure;

fig. 4 is a view for explaining a Discontinuous Reception (DRX) operation of a terminal according to an embodiment of the present disclosure;

fig. 5 illustrates 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;

fig. 6 shows a block configuration of a terminal according to an embodiment of the present disclosure;

fig. 7 shows a block diagram configuration of a base station according to an embodiment of the present disclosure; and is

Fig. 8 is a flowchart illustrating a method of a terminal according to an embodiment of the present disclosure.

Throughout the drawings, it should be noted that the same reference numerals are used to depict the same or similar elements, features and structures.

Detailed Description

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details that are helpful for understanding, but these are to be considered merely illustrative. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to bibliographic meanings, but are used only by the inventors to enable a clear and consistent understanding of the disclosure. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present disclosure are provided for illustration only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

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.

In the drawings, some elements may be exaggerated, omitted, or schematically shown for the same reason. Further, the size of each element does not completely reflect the actual size. In the drawings, the same or corresponding elements have the same reference numerals.

Advantages and features of the present disclosure and the manner of attaining them will become apparent by reference to the following detailed description of embodiments when taken in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be embodied in various different forms. The following examples are provided solely for the purpose of complete disclosure and to inform those skilled in the art of the scope of the disclosure, and the disclosure is to be limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals denote the same or similar elements.

Here, it will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block(s). These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block(s). The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart block(s).

Furthermore, each block of the flowchart illustrations may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

As used herein, a "unit" refers to a software element or a hardware element, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), that performs a predetermined function. However, the "unit" does not always have a meaning limited to software or hardware. A "unit" may be configured to be stored in an addressable storage medium or to execute one or more processors. Thus, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" may be combined into a smaller number of elements or "units" or divided into a larger number of elements or "units". Further, the elements and "units" may alternatively be implemented as one or more Central Processing Units (CPUs) within a rendering device or secure multimedia card. Furthermore, a "unit" in an embodiment may include one or more processors.

Hereinafter, the operational principle of the present disclosure will be described in detail with reference to 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 rather unclear. The terms to be described below are terms defined in consideration of functions in the present disclosure, and may be different according to a user, a user's intention, or a habit. Therefore, the definition of the terms should be made based on the contents of the entire specification.

In the following description, terms for identifying an access node, terms related to network entities, terms related to messages, terms related to interfaces between network entities, terms related to various identification information, and the like are illustratively used for convenience. Accordingly, the present disclosure is not limited by the terms used below, and other terms related to subjects having equivalent technical meanings may be used.

In the following description, for convenience of description, the present disclosure will be described using terms and names defined in the third 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 may be applied to systems conforming to other standards in the same manner. In particular, the present disclosure can be applied to a 3GPP new radio (NR: 5G mobile communication standard) system.

Fig. 1 illustrates a structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure.

Referring to fig. 1, a wireless communication system includes a plurality of base stations 1-05, 1-10, 1-15, and 1-20, Mobility Management Entities (MMEs) 1-25, and serving gateways (S-GWs) 1-30. User equipment (hereinafter, referred to as UE or terminal) 1-35 accesses an external network through base stations 1-05, 1-10, 1-15, and 1-20 and S-GW 1-30.

The base stations 1-05, 1-10, 1-15 and 1-20 are access nodes of a cellular network and provide wireless access to terminals of the access network. That is, the base stations 1-05, 1-10, 1-15, and 1-20 collect state information such as a buffer status, an available transmission power status, and a channel status of a terminal to perform scheduling, and support a connection between the terminal and a Core Network (CN) to thereby serve traffic of a user. The MME 1-25 is a device responsible for various control functions of the terminal and mobility management functions, and is connected to a plurality of base stations, and the S-GW 1-30 is a device providing data bearers. Further, the MME 1-25 and the S-GW 1-30 may also perform authentication, bearer management, and the like for terminals accessing the network, and process packets arriving from the base stations 1-05, 1-10, 1-15, and 1-20 or packets to be transmitted to the base stations 1-05, 1-10, 1-15, and 1-20.

Fig. 2 illustrates a radio protocol structure of an LTE system according to an embodiment of the present disclosure. The NR to be defined below may be partially different from the wireless protocol structure in the drawings, but will be described for convenience of description of the present disclosure.

Referring to fig. 2, in a radio protocol of an LTE system, a terminal and an ENB include Packet Data Convergence Protocols (PDCP)2-05 and 2-40, Radio Link Controls (RLC) 2-10 and 2-35, and Medium Access Controls (MAC) 2-15 and 2-30, respectively. Packet Data Convergence Protocols (PDCP)2-05 and 2-40 are responsible for operations such as IP header compression/decompression, and radio link controls (hereinafter, referred to as RLC)2-10 and 2-35 reconfigure PDCP Packet Data Units (PDUs) in an appropriate size. The MACs 2-15 and 2-30 are connected to several RLC layer devices configured in one terminal and perform operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from the MAC PDUs. The physical layers 2-20 and 2-25 perform an operation of channel-coding and modulating higher layer data into OFDM symbols to transmit the OFDM symbols through a wireless channel, or an operation of demodulating and channel-decoding OFDM symbols received through a wireless channel to transmit the demodulated and channel-decoded OFDM symbols to higher layers. In addition, even the physical layer uses hybrid automatic repeat request (HARQ) for additional error correction, and the receiving end transmits whether to receive a packet transmitted from the transmitting end through 1 bit. This is referred to as HARQ ACK/NACK information. The downlink HARQ ACK/NACK information for uplink transmission may be transmitted through a physical hybrid-ARQ indicator channel (PHICH) physical channel, and the uplink HARQ ACK/NACK information for downlink transmission may be transmitted through a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH) physical channel. The PUCCH is used not only for the terminal to transmit HARQ ACK/NACK information to the base station, but also for the terminal to transmit downlink Channel State Information (CSI) and Scheduling Request (SR) to the base station. When a terminal transmits an SR as 1-bit information to a resource within a PUCCH configured by a base station, the base station recognizes that the corresponding terminal has data to be transmitted to an uplink, and allocates an uplink resource. Through the uplink resources, the terminal may send a detailed Buffer Status Report (BSR) message. The base station may allocate a plurality of SR resources to one terminal.

A physical layer (PHY) may include one or more frequencies/carriers, and a technology in which one base station simultaneously configures and uses a plurality of frequencies is referred to as a carrier aggregation (hereinafter, referred to as "CA") technology. In the CA technology, one or more secondary carriers are used for communication between a terminal (or User Equipment (UE)) and a base station (or E-UTRAN NodeB (eNB)) in addition to a primary carrier, instead of only one carrier, to greatly increase the transmission amount in proportion to the number of secondary carriers. In LTE, a cell using a primary carrier in a base station is referred to as a primary cell (PCell), and a secondary carrier is referred to as a secondary cell (SCell). A technique of extending the CA function to two base stations is called a dual connection (hereinafter, referred to as "DC") technique. In the DC technology, a terminal connects and uses a master base station (master E-UTRAN NodeB, hereinafter, referred to as "MeNB") and a secondary base station (secondary E-UTRAN NodeB, hereinafter, referred to as "SeNB"), a cell belonging to the MeNB is referred to as a master cell group (hereinafter, referred to as "MCG"), and a cell belonging to the SeNB is referred to as a secondary cell group (hereinafter, referred to as "SCG") at the same time. Each cell group has a representative cell, the representative cell of the master cell group is referred to as a primary cell (hereinafter, referred to as "PCell"), and the representative cell of the secondary cell group is referred to as a primary secondary cell (hereinafter, referred to as "PSCell"). In case of using the above NR, MCG uses LTE technology, and SCG uses NR, so that the terminal can use both LTE and NR. This is called E-UTRA-NR double ligation (EN-DC). Instead, a scenario where MCG uses NR technology and SCG uses LTE technology may also be considered, which is referred to as NR-E-UTRA dual connectivity (NE-DC). Further, a technique in which both MCG and SCG use NR technology is called NR-NR double junction (NR-DC).

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

Meanwhile, the transmission units of the PCell and the SCell may be the same or different. For example, in LTE, the transmission units of the PCell and SCell may be the same, both being 1ms units, but in NR, the transmission unit (slot) of the PCell is 1ms and the transmission unit of the SCell may have a length of 0.5 ms.

Table 1 below shows information of slot lengths available in each serving cell (i.e., PCell or SCell) according to a set of parameters (or secondary carrier spacing) used by each serving cell in NR.

[ Table 1]

Further, in LTE and NR, the following units are used in a frame structure in a radio interval (i.e., between a base station and a terminal).

-radio frame: length 10ms, identified by the System Frame Number (SFN) of each radio frame.

-a subframe: length 1ms, where a radio frame has 10 subframes. The subframes are identified by subframe numbers 0 to 9 within each radio frame.

-time slots: the length having a value according to the configuration shown in the table is a transmission unit used when the base station and the terminal transmit data.

Fig. 3A and 3B are views for explaining a Carrier Aggregation (CA) technique in a terminal according to various embodiments of the present disclosure.

Referring to fig. 3A and 3B, in one base station, multiple carriers may be transmitted or received over several frequency bands in general. For example, in the related art, when the base station 3-05 transmits the carrier 3-15 having the center frequency f1 and the carrier 3-10 having the center frequency f3, one terminal transmits or receives data by using one carrier between the two carriers. However, a terminal having a carrier aggregation capability can transmit or receive data by using a plurality of carriers simultaneously. The base station 3-05 may allocate more carriers to the terminal 3-30 with carrier aggregation capability depending on the situation in order to increase the transmission rate of the terminal 3-30.

When one forward carrier and one reverse carrier transmitted and received by one base station form one cell, carrier aggregation may be understood as a conventional sense in which a terminal simultaneously transmits or receives data through a plurality of cells. With carrier aggregation, the maximum transmission rate increases in proportion to the number of aggregated carriers (or the number of serving cells).

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.

For the CA configuration (or for handover to a neighboring base station, etc.), the terminal may receive a measurement configuration from the base station to report a result obtained by measuring the neighboring cell. Accordingly, the terminal may perform measurement according to the measurement configuration received from the base station and report the performed measurement result to the base station. The measurement configuration may include detailed information on a frequency to be measured and a condition for reporting the measurement, and additionally include information on a measurement gap in which the terminal measures another frequency. Therefore, when a terminal is configured with a measurement gap, the terminal may be allocated with a periodic measurement gap according to the configured information. Therefore, in order to measure a frequency, a measurement corresponding to a measurement gap is configured, and the terminal does not perform the following operation on the current base station (or serving cell(s) using a frequency related to the measurement).

PUCCH transmission (HARQ ACK/NACK, SR, CSI)

-SRS transmission

PDCCH monitoring and data reception, wherein, however, the terminal performs PDCCH monitoring and data reception when the terminal is required to receive RAR or recognize whether Msg3 transmission was successful.

Data transfer, wherein, however, when random access is being performed, Msg3 transfer of random access needs to be performed.

Further, the terminal may perform data transmission/reception with the base station in an interval excluding the above-described measurement gap. In NR, in the case where the operating frequency is 410MHz to 7125MHz (refer to Rel-15 as NR version information), this is referred to as frequency range 1(FR1), and in the case where the operating frequency is 24250MHz to 52600MHz, this is referred to as frequency range 2(FR 2). Therefore, if the measurement gap is configured for FR1 measurement, the terminal may not perform the above-described operation in the serving cell(s) using the FR1 frequency, and may perform the above-described operation in the serving cell(s) using the FR2 frequency. For example, if the measurement gap is configured for FR2 measurement, the terminal may not perform the above-described operation in the serving cell(s) using the FR2 frequency, and may perform the above-described operation in the serving cell(s) 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-described operation in all serving cell(s) during the measurement gap.

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-described operation during the measurement gap, the terminal and the base station are required to have the same understanding of the measurement gap. Meanwhile, the MCG and the SCG may use different SFNs. Furthermore, a scenario may be assumed where FR1 and FR2 use different SFNs, even within an MCG or SCG. In this case, the base station may implicitly or explicitly indicate to the terminal the cell for which the measurement gap is to be configured with reference to its SFN.

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

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 configure a cell of the measurement gap by referring to its SFN by using an explicit indicator. As an explicit indicator, a field such as refServCellIndicator may be used, and refServCellIndicator may indicate one value among pCell, pSCell, and MCG-FR2, thereby indicating one of serving cells using FR2 to be used as a reference among serving cells of pCell, pSCell, or MCG. Further, considering the case where the MCG uses FR1 and FR2 and the SCG uses FR1 and FR2 in NR-DC, a scene of further expanding a refServCellIndicator may be considered, and for this, a refServCellIndicator ext may be introduced to indicate SCG-FR 2. Alternatively, in order to configure the measurement gap with reference to the SFN and subframe boundary of a specific serving cell within the MCG or SCG, a scenario in which an identifier (ServCellIndex) of the serving cell is additionally indicated as refServCellIndicator may be considered. In this case, (considering the case where the master scene is FR2), a field such as refServCellIndicator FR2, which is another extended version of refServCellIndicator, may be newly defined, and a corresponding field may be defined to indicate an identifier of a serving cell. Accordingly, when the measurement gap is configured for the terminal, the terminal may determine a cell for 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 FR2 frequency indicated by a newly defined field (such as refservcelllndicator FR 2).

When the CA technique is used in the NR system, Frequency Division Duplexing (FDD) (transmission using downlink and uplink of different frequencies) or Time Division Duplexing (TDD) (transmission divided in time in downlink and uplink of the same frequency) can be selectively used for each serving cell according to the situation of a base station and a service provider.

Specifically, as shown in fig. 3B, when the TDD technique 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)) identically. When the downlink time point and the uplink time point overlap at adjacent frequencies, since a downlink signal of a base station (e.g., a base station transmitting a relatively stronger signal than a terminal) interferes with an uplink of an adjacent frequency, communication may become difficult due to interference influence in a corresponding uplink. To this end, as shown, 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). Also in this example, a scenario may be considered in which service provider A uses two carriers 3-73 and 3-75 through CA. In this case, the pattern between the two carriers 3-73 and 3-75 owned by service provider a may be different since the desired TDD pattern has been used without a separate agreement between service providers B and C.

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

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

Table 2 below shows a message format used when the base station configures the terminal with the TDD pattern of each serving cell in the NR system. For example, the message format is an existing TDD pattern message format. According to the existing TDD pattern message format, a TDD pattern is configured in the order of downlink slots (nrofDownlinkSlots) and downlink symbols (nrofDownlinkSymbols) from the start time points 3-50 and 3-60 of a frame, whereas a TDD pattern is configured in the order of uplink slots (nrofUplinkSlots) and uplink symbols (nrofUplinkSymbols) from the last position of the corresponding pattern. Thus, the entire sequence is defined as a downlink slot (nrofDownlinkSlots), a downlink symbol (nrofDownlinkSymbols), an uplink symbol (nrofUplinkSymbols), and an uplink slot (nrofUplinkSlots).

[ Table 2]

According to the format shown in table 2 above, when the service provider a intends to configure the serving cells indicated by reference numerals 3-73 as scells of the terminal by using the serving cells indicated by reference numerals 3-75 as pcells, there is a problem in that the TDD patterns (starting from uplink slots) of the serving cells indicated by reference numerals 3-73 cannot be configured by using the current signaling structure.

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 slot according to the above-described secondary carrier interval by adding patternOffset to a message configured to the terminal by the base station, as described below. For example, in the case of reference numerals 3-73 of FIG. 3B, the patternOffset may be signaled in two slots to inform the service provider that the pattern itself needs to be moved by two slots. The base station may signal to the terminal the offset of the cell indicated by reference numerals 3-73 and configured as an SCell in the terminal. As a unit of patternOffset, a slot unit is shown in this example, but a symbol unit or a subframe unit may be used.

Table 3 below shows example 1 of a new TDD pattern message format.

[ Table 3]

In another embodiment, when the offset occurs as described above, for the case where the uplink time slot is first located, a method for informing the number of uplink time slots (nrofstartuplinkslots) existing from the start point of the corresponding SCell with respect to the PCell may also be considered. The message format showing the above is shown in table 4.

For example, table 4 shows example 2 of a new TDD pattern message format.

[ Table 4]

Another embodiment provides a method for adding 1-bit information (reverse) to generate a new pattern starting from an uplink time slot instead of a downlink time slot. Specifically, the method is a method for changing the order to the above-described order of the uplink slot (nrofDownlinkSlots), the uplink symbol (nrofDownlinkSymbols), the downlink symbol (nrofUplinkSymbols), and the downlink slot (nrofuplinkstroms) in the case where the reverse field is included, instead of the downlink slot (nrofdownlinlnsslots), the downlink symbol (nrofdownlinlnsymbols), the uplink symbol (nrofUplinkSymbols), and the uplink slot (nrofuplinkstrombols).

For example, table 5 shows example 3 of a new TDD pattern message format.

[ Table 5]

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

For example, in the case of Discontinuous Reception (DRX), which will be described later, it is necessary to determine a slot number, which is used as a reference time point of an SFN to which a DRX cycle is allocated. As an example, the slot number may be determined with reference to slot number 0 and SFN of PCell.

Also, the "configured uplink grant" for performing periodic allocation so as not to transmit a physical downlink control channel (hereinafter, referred to as "PDCCH") for transmitting downlink and uplink scheduling information has two types. Specifically, type 1 is a scheme in which both a start time point and a period are configured in an RRC layer, and type 2 is a scheme in which only a period is configured in an RRC layer and then an uplink configured through a PDCCH message is "activated". (once the uplink is activated, thereafter, the uplink can be transmitted according to a period configured by RRC without PDCCH.) in this case, since a start time point is configured in type 1, a problem arises with reference to explain a slot number. Accordingly, a configured uplink of the PCell is determined with reference to the SFN, slot number or symbol number of the PCell, and if no additional slot offset is configured, the configured uplink of the SCell may be defined to start with reference to the PCell, and to start with reference to the adjusted SFN/slot number if a slot offset is configured for the corresponding SCell.

Further, in case of activating an SCell configured by a message of an RRC layer for actual use and then deactivating an operation of the SCell, a MAC Control Element (CE) as a control message of a MAC layer may indicate activation and deactivation of a specific SCell (SCell activation/deactivation MAC CE), and since a terminal having received the MAC CE cannot be immediately activated and deactivated, when the MAC CE is received in an n slot, a corresponding operation is performed in an n + k slot. If the slot numbers are different, as shown in scheme B, the start time point also needs to be adjusted, summarized in table 6 below.

[ Table 6]

Regardless of the cell that has received the MAC CE and the cell to be activated, the cell can always be unconditionally activated at a time point n + k that is a time point referring to the PCell.

Fig. 4 is a view for explaining the above-described discontinuous reception (hereinafter, referred to as "DRX") operation of a terminal according to an embodiment of the present disclosure.

Referring to fig. 4, DRX is a technique for monitoring only some physical downlink control channels (hereinafter, referred to as "PDCCHs") according to the above-described configuration information, instead of monitoring all PDCCHs, in order to obtain scheduling information according to the configuration of the base station, thereby minimizing power consumption of the terminal. The basic DRX operation has a DRX cycle of 4-00, and monitors the PDCCH only during on-Duration (on-Duration) time of 4-05. In connected mode, the DRX cycle is configured to two values for long DRX and short DRX. Typically, a long DRX cycle is applied, and the base station may additionally configure a short DRX cycle, if necessary. If the long DRX period and the short DRX period are configured, the terminal starts a short DRX timer and repeats from the short DRX period. If there is no new traffic until after the short DRX timer expires, the terminal changes the period from the short DRX period to the long DRX period. If scheduling information related to a new packet is received via the PDCCH during the on-duration 4-05 time (operation 4-10), the terminal starts a DRX inactivity timer (operation 4-15). The terminal maintains an active state during the DRX inactivity timer. For example, the terminal continues to perform PDCCH monitoring. In addition, the terminal also starts a HARQ Round Trip Time (RTT) timer (operations 4-20). The HARQ RTT timer may be used to prevent the terminal from unnecessarily monitoring the PDCCH during the HARQ Round Trip Time (RTT). Therefore, the terminal does not need to perform PDCCH monitoring during the timer operation time. However, when the DRX inactivity timer and the HARQ RTT timer are simultaneously operated, the terminal continues to perform PDCCH monitoring based on the DRX inactivity timer. When the HARQ RTT timer expires, a DRX retransmission timer is started (operations 4-25). When the DRX retransmission timer operates, the terminal is required to perform PDCCH monitoring. Generally, scheduling information for HARQ retransmissions is received during DRX retransmission timer operation time (operations 4-30). When receiving the scheduling information, the terminal immediately stops the DRX retransmission timer and starts the HARQ RTT timer again. The above operations continue until the packet is successfully received (operations 4-35).

As described above, in the case where at least two cells in CA have different frame start points (e.g., 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 a cell to be used as a reference time point of an SFN to which a DRX cycle is allocated with reference to its slot number. According to an embodiment, a cell may be determined with reference to slot number 0 and SFN of PCell.

Accordingly, the terminal can determine a DRX duration, which is an interval to maintain an active state during the DRX inactivity timer, by using the SFN of the PCell.

Fig. 5 is a flowchart illustrating an operation sequence of a terminal when operating by configuring a serving cell having different frame timing using CA according to an embodiment of the present disclosure.

Referring to fig. 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 the base station (operation 5-01).

Thereafter, the terminal may report the capabilities the terminal has to the base station (operation 5-03). The terminal may report that the terminal may have different frame start points through the capability information of the terminal, as described in fig. 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 the at least two cells.

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

Thereafter, the terminal may receive a rrcreeconfiguration 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 case of adding to additionally using the SCell as described above, configuration information related thereto may be included. Configuration information such as the slot offset required for the above-described scheme a and scheme B may be included in a message of the RRC layer. Various message formats when describing scheme a are information included in the rrcreeconfiguration message.

When the scheme a is used according to the information (operation 5-07), when the above-described DRX, configured uplink allocation information, and SCell activation and deactivation time points are calculated, the terminal may perform a corresponding operation by applying the same slot number and SFN as the PCell (operation 5-11).

However, when scheme B is used (operation 5-07), the terminal may perform an operation by applying a slot number and SFN corrected by a slot offset as described in fig. 3B with respect to the configuration information of the corresponding SCell (operation 5-13).

Further, a scenario in which the above measurement gap is configured by the RRCReconfiguration message may be considered. In more detail, the base station may configure the following parameters related to the measurement gap.

Gap types (e.g., gapUE, gapFR1 and gapFR2)

Information of the starting point and period of the measurement gap in the gap type

-a reference indicator (refServerCellIndicator or refServerCellIndicator Ext) of the measurement gap

When the above scheme B is used, the SFN starting point may be changed for each serving cell in the case of determining the SFN and the subframe boundary by using one serving cell among several serving cells (such as mcg-FR2 and scg-FR2) using FR 2. To this end, the terminal may select one serving cell among corresponding serving cells (e.g., among serving cells using FR2) among cells whose SFN is not slot offset corrected, in order to determine the location 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 may determine a measurement gap with reference to a specific serving cell (e.g., a serving cell to which a slot offset is not applied among pcells, pscells, or mcg-FR2/scg-FR2, or a specific serving cell indicated by a base station) and measure neighbor cells during the measurement gap at the same timing as the base station.

In more detail, in the case where the gap type configured by the base station is gapFR2 and one of a refServCellIndicator and a refServCellIndicator ext is configured, if the corresponding configuration content is related to the PCell or the PSCell, the terminal uses the corresponding cell as a reference cell for measuring the gap. However, in case of mcg-FR2 or scg-FR2, when scheme B is used, the terminal uses one of serving cells to which no offset is applied among serving cells of FR2 as a reference cell for a measurement gap. Alternatively, as another method, the terminal may use a serving cell having the lowest ServCellIndex among the corresponding serving 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 serving cell as a reference cell for the measurement gap.

In the case where the gap type configured by the base station is gapFR2, if refServCellIndicator and refServCellIndicator ext are not configured, the terminal uses a serving cell satisfying a predetermined condition (e.g., where no slot offset is configured or has the lowest ServCellIndex) among FR2 serving cells as a reference cell for measuring the gap.

In the case where the gap type configured by the base station is gapFR1 or gapUE, if a refServCellIndicator is configured, the terminal uses a serving cell indicated among the PCell and the PSCell, and if the refServCellIndicator is not configured, always uses the PCell as a reference cell for measuring the gap.

Alternatively, in case that the gap type configured by the base station is gapFR1 or gapUE, the base station may configure a specific SCell (using FR1) for the terminal as a reference cell for measuring the gap by configuring a separate parameter such as refservcelllndicatorextfr 1 to indicate one SCell among scells using 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 (e.g., 15kHz for PCell and 30kHz for SCell). For example, in the above example, since the slot gap of the SCell is shorter than that of the PCell (one slot is 1ms for the PCell and one slot is 0.5ms for the SCell), the base station may determine a reference cell for the measurement gap with reference to the SCell indicated by refservcellindicatoxtfr 1 in order to configure the measurement gap of the terminal in more detail even for FR 1.

Further, thereafter (or through the rrcrconfiguration message described above), the terminal may receive the DRX configuration from the base station. The DRX configuration includes timers required for DRX driving, and each timer and a time unit of each timer are as follows.

-on duration (onDuration) timer: set to the number of slots in the reference cell

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

-short DRX cycle timer: set to the number of slots in the reference cell

-long DRX cycle: set to the number of slots in the reference cell (or to the number of subframes)

-DRX inactivity timer: set to the number of slots in the reference cell

-HARQ RTT timer: set to the number of slots in which transmission/retransmission is performed in the corresponding cell

-DRX retransmission timer: set to the number of slots in which transmission/retransmission is performed in the corresponding cell

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

Accordingly, the terminal may repeat the corresponding period according to the configured period and monitor the PDCCH during the on-duration. The terminal may drive the DRX inactivity timer at a time point when the on duration ends when there is a new data transmission in the on duration, and drive the HARQ RTT timer when a new data transmission is received. The terminal may perform the above-described operations when it receives a new data transmission in the above-described active time interval. Further, when a packet is not successfully received until the HARQ RTT timer expires, the terminal may drive a DRX retransmission timer to monitor a retransmitted PDCCH from the base station. When a 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 may use the short DRX cycle again and repeat the above procedure (operations 5-05).

Fig. 6 shows a block configuration of a terminal according to an embodiment of the present disclosure.

Referring to fig. 6, the terminal may include a Radio Frequency (RF) processor 6-10, a baseband processor 6-20, a storage 6-30, and a controller 6-40.

The RF processors 6-10 may perform functions of transmitting or receiving signals via wireless channels, such as band conversion and amplification of the signals. For example, the RF processor 6-10 up-converts a baseband signal provided from 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 processors 6-10 may include transmit filters, receive filters, amplifiers, mixers, oscillators, digital-to-analog converters (DACs), analog-to-digital converters (ADCs), and so forth. In fig. 6, only one antenna is shown, but the terminal may include a plurality of antennas. Further, the RF processors 6-10 may include a plurality of RF chains. In addition, the RF processors 6-10 may perform beamforming. For beamforming, the RF processors 6-10 may adjust the phase and magnitude of each signal transmitted or received via multiple antennas or antenna elements.

The baseband processors 6-20 may perform the conversion function between the baseband signal and the bit stream according to the physical layer specification of the system. For example, in data transmission, the baseband processors 6 to 20 may generate complex symbols by encoding and modulating a transmission bit stream. Further, upon data reception, the baseband processor 6-20 may demodulate and decode the baseband signal provided from the RF processor 6-10 to recover the received bit stream. For example, when transmitting data according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme, the baseband processors 6 to 20 may generate complex symbols by encoding and modulating a transmission bit stream and mapping the complex symbols to subcarriers, and then configure the OFDM symbols through an Inverse Fast Fourier Transform (IFFT) operation and Cyclic Prefix (CP) insertion. Also, at the time of data reception, the baseband processor 6-20 may divide the baseband signal provided from the RF processor 6-10 into OFDM symbol units and restore the signal mapped to the subcarriers through a Fast Fourier Transform (FFT) operation, and then restore the received bit stream through demodulation and decoding.

The baseband processor 6-20 and the RF processor 6-10 may transmit and receive signals as described above. Thus, the baseband processor 6-20 and the RF processor 6-10 may be referred to as transmitters, receivers, transceivers or communicators. Further, at least one of the baseband processor 6-20 and the RF processor 6-10 may include different communication modules in order to process signals of different frequency bands. The different frequency bands may include the ultra high frequency (SHF) (e.g., 2.5GHz and 5GHz) frequency band and the millimeter wave (e.g., 60GHz) frequency band.

The storage means 6-30 may store data such as basic programs, application programs and configuration information for the operation of the terminal.

The controllers 6-40 may control the overall operation of the terminal. For example, the controller 6-40 transmits 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 controllers 6-40 may include at least one processor. For example, the controllers 6-40 may include a Communication Processor (CP) that performs communication control, and an Application Processor (AP) that controls higher layers such as an application program. According to an embodiment, the controller 6-40 includes a multi-connection processor 6-42 that performs processes for operating in a multi-connection mode. For example, the controllers 6-40 may control the terminal to perform the procedures shown in the operation of the terminal shown in fig. 6.

For example, the controller 6-40 may control the transceiver to transmit a 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, and to receive a second message including slot offset information between the first cell and the second cell.

Further, in case that the frame boundaries of the first cell and the second cell are not aligned, the controller 6-40 may control to determine the first cell based time offset of the second cell according to the slot offset information.

According to an embodiment, when a base station configures a slot offset for a terminal, the terminal may determine downlink and uplink slots to perform reception and transmission.

Fig. 7 illustrates a structure of a base station according to an embodiment of the present disclosure.

Referring to fig. 7, the base station may include a transceiver 710, a controller 720, and a storage 730. In this disclosure, a controller may be defined as a circuit, an application specific integrated circuit, or at least one processor.

Transceiver 710 may transmit or receive signals to or from other network entities. For example, the transceiver 710 may transmit a message to a terminal.

According to an embodiment set forth 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 the blocks in order to perform the above-described operations.

For example, the controller 720 may control the transceiver to receive a 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, and to transmit a second message including slot offset information between the first cell and the second cell.

Further, 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.

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

Referring to fig. 8, first, at operation 810, a terminal may transmit 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.

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

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

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

When the 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 within the electronic device. The at least one program may include instructions for causing the electronic device to perform methods in accordance with various embodiments of the present disclosure as defined by the appended claims and/or disclosed herein.

Programs (software modules or software) may 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 Disks (DVD), or other types of optical storage devices or magnetic tape. Alternatively, any combination of some or all of them may form a memory storing a program. Further, a plurality of such memories may be included in the electronic device.

Further, the program may 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 may access the electronic device via an external port. In addition, a separate storage device on the communication network may access the portable electronic device.

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

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising:

transmitting a 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;

receiving a second message including 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 slot offset information when the frame boundaries of the first cell and the second cell are not aligned.

2. The method of claim 1, wherein a System Frame Number (SFN) of the first cell is used to calculate a Discontinuous Reception (DRX) duration.

3. The method of claim 1, further comprising:

receiving 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; and

configuring the measurement gap based on a System Frame Number (SFN) and a subframe of a serving cell indicated by the received indicator,

wherein a System Frame Number (SFN) of the serving cell is used for configuring the uplink grant, and

wherein the first cell is a primary cell (pcell) and the second cell is at least one secondary cell (scell).

4. A method performed by a base station in a wireless communication system, the method comprising:

receiving a 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;

determining a second message comprising slot offset information between the first cell and the second cell; and

the second message is sent out in a second message,

wherein the time offset of the second cell based on the first cell is determined according to the slot offset information when the frame boundaries of the first cell and the second cell are not aligned.

5. The method of claim 4, further comprising:

transmitting 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,

wherein the measurement gap is configured based on a System Frame Number (SFN) and a subframe of a serving cell indicated by the indicator,

wherein a System Frame Number (SFN) of the first cell is used to calculate a Discontinuous Reception (DRX) duration,

6. A terminal in a wireless communication system, the terminal comprising:

a transceiver; and

at least one processor configured to:

controlling the transceiver to transmit a 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, and to receive a second message including slot offset information between the first cell and the second cell, and

7. The terminal of claim 6, wherein a System Frame Number (SFN) of the first cell is used to calculate a Discontinuous Reception (DRX) duration.

8. The terminal of claim 6, wherein the at least one processor is further configured to:

control the transceiver to receive 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, and

configuring the measurement gap based on a System Frame Number (SFN) and a subframe of a serving cell indicated by the received indicator.

9. The terminal of claim 6, wherein a System Frame Number (SFN) of a serving cell is used to configure the uplink grant.

10. The terminal of claim 6, wherein the first cell is a primary cell (pcell) and the second cell is at least one secondary cell (scell).

11. A base station in a wireless communication system, the base station comprising:

a transceiver; and

at least one processor configured to:

control the transceiver to receive a 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,

determining a second message comprising slot offset information between the first cell and the second cell, an

Control the transceiver to transmit the second message,

12. The base station of claim 11, wherein a System Frame Number (SFN) of the first cell is used to calculate a Discontinuous Reception (DRX) duration.

13. The base station according to claim 11, wherein,

wherein the at least one processor is further configured to:

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,

wherein the measurement gap is configured based on a System Frame Number (SFN) and a subframe of a serving cell indicated by the indicator.

14. The base station according to claim 11, wherein,

wherein a System Frame Number (SFN) of the serving cell is used to configure the uplink grant.

15. The base station of claim 11, wherein the first cell is a primary cell (pcell) and the second cell is at least one secondary cell (scell).