KR20210126443A - Method and apparatus for operating dormancy cell in wireless communication system - Google Patents

Abstract

The present invention relates to a communication technique for convergence of a fifth-generation (5G) communication system with Internet of things (IoT) technology to support a higher data rate after a fourth-generation (4G) system, and a system thereof. The present invention can be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. According to the present invention, a method for setting a bandwidth in a wireless communication system comprises the following steps of: receiving downlink control information through a downlink control channel from a first cell; determining whether a human indicator field exists in the downlink control information on the basis of the downlink control information; and when it is determined that the human indicator field does not exist, transmitting a sounding reference signal (SRS) to the first cell.

Description

Method and apparatus for operating a dormant cell in a wireless communication system {METHOD AND APPARATUS FOR OPERATING DORMANCY CELL IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a method and apparatus for operating a dormant cell in a wireless communication system.

Efforts are being made to develop an improved 5th generation (5G) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G (4th generation) communication system. For this reason, the 5G communication system or the pre-5G communication system is called a system after a 4G network (Beyond 4G Network) communication system or a Long-Term Evolution (LTE) system after (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (70 GHz) band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway. In addition, in the 5G system, FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), which are advanced coding modulation (ACM) methods, and FBMC (Filter Bank Multi Carrier), which are advanced access technologies, NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are being implemented by 5G communication technologies such as beamforming, MIMO, and array antenna. . The application of a cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of the convergence of 3eG technology and IoT technology.

As various services can be provided according to the above-mentioned and the development of wireless communication systems, a method for smoothly providing these services is required. In particular, in order to provide a service to a user for a longer period of time, a method for effectively operating a dormant cell is required.

The disclosed embodiment is to provide a method and apparatus for operating a dormant cell in a wireless communication system.

A method performed by a terminal in a wireless communication system according to an embodiment of the present disclosure includes: receiving downlink control information from a first cell through a downlink control channel; determining whether a human indicator field exists in the downlink control information based on the downlink control information; and transmitting a Sounding Reference Signal (SRS) to the first cell as a result of determining that the human indicator field does not exist.

According to the disclosed embodiment, it is possible to provide a communication method and apparatus capable of effectively operating a dormant cell in a wireless communication system.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource area in which data or a control channel is transmitted in a 5G wireless communication system.
2 is a diagram illustrating an example of a slot structure used in a 5G wireless communication system.
3 is a diagram illustrating an example of a setting for a bandwidth part (BWP) of a 5G wireless communication system.
4 is a diagram illustrating an example of a control resource set through which a downlink control channel is transmitted in a 5G wireless communication system.
5 is a diagram illustrating the structure of a downlink control channel of a 5G wireless communication system.
6 is a diagram illustrating an example of a discontinuous reception (DRX) operation of a 5G wireless communication system.
7 is a diagram illustrating examples of various operating scenarios of a Sounding Reference Signal (SRS) according to an embodiment of the present disclosure.
8 is a diagram illustrating an uplink transmission structure of a 5G or NR system according to an embodiment of the present disclosure.
9 is a diagram illustrating a structure in which SRS is allocated for each subband according to an embodiment of the present disclosure.
10 is a diagram illustrating an example of a method of operating a dormant cell according to an embodiment of the present disclosure.
11 is a diagram illustrating an example of a downlink control information (DCI) structure indicating SRS transmission according to an embodiment of the present disclosure.
12 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.
13 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure.

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

In describing the embodiments, descriptions of technical content that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding elements in each figure.

Advantages and features of the present disclosure, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present disclosure to be complete, and common knowledge in the art to which the present disclosure pertains. It is provided to fully inform those who have the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. In addition, in the description of the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of gNode B, eNode B, Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a terminal, and an uplink (UL) is a wireless transmission path of a signal transmitted from a terminal to a flag station. In addition, although LTE, LTE-A, or 5G systems may be described below as an example, embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, 5G mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in this, and 5G below may be a concept including existing LTE, LTE-A and other similar services. have. In addition, the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly deviate from the scope of the present disclosure as judged by a person having skilled technical knowledge.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible that the instructions stored in the flow chart block(s) produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it is possible that the blocks are sometimes performed in the reverse order according to the corresponding function.

In this case, the term '~ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~ unit' performs certain roles do. However, '-part' is not limited to software or hardware. The '~ unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' denotes components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card. Also, in an embodiment, '~ unit' may include one or more processors.

A wireless communication system, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e, such as communication standards such as communication standards such as broadband wireless that provides high-speed, high-quality packet data service It is evolving into a communication system.

As a representative example of the broadband wireless communication system, in the LTE system, an Orthogonal Frequency Division Multiplexing (OFDM) scheme is employed in a Downlink (DL), and Single Carrier Frequency Division Multiple (SC-FDMA) is used in an Uplink (UL). Access) method is adopted. Uplink refers to a radio link in which a UE (User Equipment) or MS (Mobile Station) transmits data or control signals to a base station (eNode B, or base station (BS)). It means a wireless link that transmits data or control signals. In the multiple access method as described above, the data or control information of each user can be divided by allocating and operating the time-frequency resources to which the data or control information is to be transmitted for each user so that they do not overlap each other, that is, orthogonality is established. can

As a future communication system after LTE, that is, the 5G communication system must be able to freely reflect various requirements such as users and service providers, so services that simultaneously satisfy various requirements must be supported. Services considered for the 5G communication system include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), Ultra Reliability Low Latency Communication (URLLC), etc. There is this.

eMBB aims to provide a higher data transfer rate than the data transfer rates supported by existing LTE, LTE-A or LTE-Pro. For example, in the 5G communication system, the eMBB should be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the viewpoint of one base station. In addition, the 5G communication system must provide the maximum transmission speed and at the same time provide the increased user perceived data rate of the terminal. In order to satisfy such a requirement, it is required to improve various transmission and reception technologies, including a more advanced multi-antenna (Multi Input Multi Output, MIMO) transmission technology. In addition, while transmitting signals using up to 20 MHz transmission bandwidth in the 2 GHz band used by LTE, the 5G communication system uses a frequency bandwidth wider than 20 MHz in the frequency band of 3 to 6 GHz or 6 GHz or more. The transmission speed can be satisfied.

At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in the 5G communication system. In order to efficiently provide the Internet of Things, mMTC requires large-scale terminal access support within a cell, improved terminal coverage, improved battery life, and reduced terminal cost. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km2) within a cell. In addition, since a terminal supporting mMTC is highly likely to be located in a shaded area that a cell cannot cover, such as the basement of a building, due to the characteristics of the service, it may require wider coverage compared to other services provided by the 5G communication system. A terminal supporting mMTC should be composed of a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.

Finally, in the case of URLLC, it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control for a robot or machine, industrial automation, Unmaned Aerial Vehicle, remote health care, emergency situations A service used for an emergency alert, etc. may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, services that support URLLC 0.5 ms and than have to satisfy the small radio access delay (latency Air interface), has at the same time the requirements of ⁷⁵ or less packet error ratio (Packet Error Rate) of the. Therefore, for a service that supports URLLC, the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is a design that must allocate wide resources in the frequency band to secure the reliability of the communication link. items may be required.

The three services of 5G, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services to satisfy different requirements of each service. Of course, 5G is not limited to the three services described above.

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in a 5G wireless communication system.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(Resource Block, RB, 104)을 구성할 수 있다.Referring to FIG. 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domain, the basic unit of a resource is a resource element (RE, 101), which is defined as 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol 102 on the time axis and 1 subcarrier 103 on the frequency axis. can be in the frequency domain

(for example, 12) consecutive REs may constitute one resource block (Resource Block, RB, 104).

2 is a diagram illustrating an example of a slot structure used in a 5G wireless communication system.

)=14). 1 서브프레임(201)은 하나 또는 복수 개의 슬롯(202, 203)으로 구성될 수 있으며, 1 서브프레임(201)당 슬롯(202, 203)의 개수는 부반송파 간격에 대한 설정 값 μ(204, 205)에 따라 다를 수 있다. 도 2의 일 예에서는 부반송파 간격 설정 값으로 μ=0(204)인 경우와 μ=1(205)인 경우가 도시되어 있다. μ=0(204)일 경우, 1 서브프레임(201)은 1개의 슬롯(202)으로 구성될 수 있고, μ=1(205)일 경우, 1 서브프레임(201)은 2개의 슬롯(203)으로 구성될 수 있다. 즉 부반송파 간격에 대한 설정 값 μ에 따라 1 서브프레임 당 슬롯 수(

)가 달라질 수 있고, 이에 따라 1 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 [표 1]로 정의될 수 있다.Referring to FIG. 2 , an example of a structure of a frame 200 , a subframe 201 , and a slot 202 is illustrated. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus, one frame 200 may be composed of a total of 10 subframes 201 . One slot (202, 203) may be defined as 14 OFDM symbols (that is, the number of symbols per slot (

)=14). One subframe 201 may consist of one or a plurality of slots 202 and 203, and the number of slots 202 and 203 per one subframe 201 is a set value μ(204, 205) for the subcarrier interval. ) may vary depending on In the example of FIG. 2 , a case of μ=0 (204) and a case of μ=1 (205) are illustrated as the subcarrier spacing setting values. When μ=0 (204), one subframe 201 may consist of one slot 202, and when μ=1 (205), one subframe 201 may consist of two slots 203. can be composed of That is, the number of slots per subframe (

) may vary, and accordingly, the number of slots per frame (

) may be different. According to each subcarrier spacing setting μ

and

may be defined in [Table 1] below.

[Table 1]

Next, a bandwidth part (BWP) setting in the 5G communication system will be described in detail with reference to the drawings.

3 is a diagram illustrating an example of a setting for a bandwidth part (BWP) in a 5G wireless communication system.

Referring to FIG. 3 , the UE bandwidth 300 is set to two bandwidth parts, that is, a bandwidth part #1 (BWP#1) 301 and a bandwidth part #2 (BWP#2) (302). An example is shown. The base station may set one or a plurality of bandwidth parts to the terminal, and may set the following information for each bandwidth part.

Of course, the configuration of the bandwidth part is not limited to the above example, and in addition to the configuration information, various parameters related to the bandwidth part may be configured for the terminal. The configuration information may be transmitted by the base station to the terminal through higher layer signaling, for example, radio resource control (RRC) signaling. At least one bandwidth part among the set one or a plurality of bandwidth parts may be activated. Whether to activate the set bandwidth part may be semi-statically transmitted from the base station to the terminal through RRC signaling or may be dynamically transmitted through downlink control information (DCI).

According to an embodiment, the terminal before the RRC (Radio Resource Control) connection may receive an initial bandwidth part (Initial BWP) for the initial connection from the base station through the MIB (Master Information Block). More specifically, the terminal receives the system information (Remaining System Information; RMSI or System Information Block 1; may correspond to SIB1) required for initial access through the MIB in the initial access stage. PDCCH can be transmitted. Setting information for a control resource set (CORESET) and a search space may be received. The control resource set and the search space set by the MIB may be regarded as identifier (Identity, ID) 0, respectively. The base station may notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for the control resource set #0 through the MIB. Also, the base station may notify the UE of configuration information on the monitoring period and occasion for the control resource set #0, that is, configuration information on the search space #0 through the MIB. The UE may regard the frequency domain set as the control resource set #0 obtained from the MIB as an initial bandwidth part for initial access. In this case, the identifier (ID) of the initial bandwidth part may be regarded as 0.

The setting of the bandwidth part supported by the 5G wireless communication system can be used for various purposes.

According to an embodiment, when the bandwidth supported by the terminal is smaller than the system bandwidth, the setting for the bandwidth part may be used. For example, the base station sets the frequency position (setting information 2) of the bandwidth part to the terminal, so that the terminal can transmit and receive data at a specific frequency location within the system bandwidth.

Also, according to an embodiment, the base station may set a plurality of bandwidth parts to the terminal for the purpose of supporting different numerologies. For example, in order to support both data transmission and reception using a subcarrier interval of 15 kHz and a subcarrier interval of 30 kHz to a certain terminal, the base station may set two bandwidth portions to a subcarrier interval of 15 kHz and 30 kHz, respectively. Different bandwidth parts can be frequency division multiplexed, and when the base station wants to transmit and receive data at a specific subcarrier interval, the bandwidth part set at the corresponding subcarrier interval can be activated.

Also, according to an embodiment, for the purpose of reducing power consumption of the terminal, the base station may set bandwidth parts having bandwidths of different sizes to the terminal. For example, when the terminal supports a very large bandwidth, for example, a bandwidth of 100 MHz and always transmits and receives data using the corresponding bandwidth, very large power consumption may occur. In particular, monitoring an unnecessary downlink control channel with a large bandwidth of 100 MHz in a situation in which there is no traffic may be very inefficient in terms of power consumption. For the purpose of reducing power consumption of the terminal, the base station may set a bandwidth part of a relatively small bandwidth to the terminal, for example, a bandwidth part of 20 MHz. In the absence of traffic, the UE may perform a monitoring operation in the 20 MHz bandwidth part, and when data is generated, it may transmit/receive data in the 100 MHz bandwidth part according to the instruction of the base station.

In the method of setting the bandwidth part, the terminals before the RRC connection (Connected) may receive the configuration information for the initial bandwidth part (Initial Bandwidth Part) through the MIB (Master Information Block) in the initial access stage. More specifically, the UE is a control resource set for a downlink control channel in which Downlink Control Information (DCI) for scheduling a System Information Block (SIB) can be transmitted from the MIB of a Physical Broadcast Channel (PBCH). , CORESET) can be set. The bandwidth of the control resource set set as the MIB may be regarded as an initial bandwidth part, and the UE may receive a Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted through the set initial bandwidth part. In addition to the purpose of receiving the SIB, the initial bandwidth part may be utilized for other system information (OSI), paging, and random access.

When one or more bandwidth parts are configured for the terminal, the base station may instruct the terminal to change the bandwidth part by using a Bandwidth Part Indicator field in DCI. For example, in FIG. 3 , if the currently activated bandwidth part of the terminal is the bandwidth part #1 (301), the base station may instruct the terminal to the bandwidth part #2 (302) as a bandwidth part indicator in the DCI, and the terminal receives the received The bandwidth part change may be performed to the bandwidth part #2 (302) indicated by the bandwidth part indicator in the DCI.

As described above, since the DCI-based bandwidth part change can be indicated by the DCI scheduling the PDSCH or the PUSCH, when the UE receives a bandwidth part change request, the PDSCH or PUSCH scheduled by the corresponding DCI is unreasonable in the changed bandwidth part. It shall be able to perform reception or transmission without To this end, the standard stipulates a requirement for the delay time (T _BWP ) required when changing the bandwidth part, and may be defined, for example, as follows.

[Table 3]

The requirement for the bandwidth part change delay time may support type 1 or type 2 according to the capability of the terminal. The terminal may report the supportable bandwidth part delay time type to the base station.

In accordance with the above-described bandwidth part change delay time requirement, when the terminal receives a DCI including a bandwidth part change indicator in slot n, the terminal changes to a new bandwidth part indicated by the bandwidth part change indicator in slot n+ It can be completed at a time point not later than T _BWP , and transmission and reception for the data channel scheduled by the corresponding DCI can be performed in the new changed bandwidth part. When the base station intends to schedule the data channel with a new bandwidth part, the time domain resource allocation for the data channel may be determined in consideration _{of the bandwidth part change delay time (T BWP ) of the terminal.} That is, when the base station schedules a data channel with a new bandwidth part, in a method of determining time domain resource allocation for the data channel, the base station can schedule the corresponding data channel after the bandwidth part change delay time. Accordingly, the UE may not expect that the DCI indicating the bandwidth part change indicates a slot offset (K0 or K2) value smaller than the _{bandwidth part change delay time (T BWP ).}

If the terminal receives a DCI (eg, DCI format 1_1 or 0_1) indicating a bandwidth part change, the terminal receives the PDCCH including the DCI from the third symbol of the slot, the time domain resource allocation indicator field in the DCI No transmission or reception may be performed during the time period corresponding to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by . For example, if the terminal receives a DCI indicating a bandwidth part change in slot n, and the slot offset value indicated by the DCI is K, the terminal starts from the third symbol of slot n to the symbol before slot n + K (that is, the slot No transmission or reception may be performed until the last symbol of n+K-1).

Next, a synchronization signal (SS)/PBCH block in the 5G wireless communication system will be described.

The SS/PBCH block may mean a physical layer channel block composed of a primary SS (PSS), a secondary SS (SSS), and a PBCH. Specifically, it may be as follows.

- PSS: A signal that serves as a reference for downlink time/frequency synchronization and provides some information on cell ID.

- SSS: serves as a reference for downlink time/frequency synchronization, and provides remaining cell ID information not provided by PSS. Additionally, it may serve as a reference signal for demodulation of the PBCH.

- PBCH: Provides essential system information necessary for transmitting and receiving data channel and control channel of the terminal. The essential system information may include search space related control information indicating radio resource mapping information of a control channel, scheduling control information on a separate data channel for transmitting system information, and the like.

- SS/PBCH block: The SS/PBCH block consists of a combination of PSS, SSS, and PBCH. One or a plurality of SS/PBCH blocks may be transmitted within 5 ms, and each transmitted SS/PBCH block may be distinguished by an index.

The UE may detect the PSS and SSS in the initial access stage and may decode the PBCH. MIB may be obtained from the PBCH, and a control resource set (CORESET) #0 (which may correspond to a control resource set having a control resource set index of 0) may be set therefrom. The UE may perform monitoring on the control resource set #0, assuming that the selected SS/PBCH block and the demodulation reference signal (DMRS) transmitted from the control resource set #0 is QCL (Quasi Co Location). The terminal may receive system information as downlink control information transmitted from the control resource set #0. The UE may obtain RACH (Random Access Channel) related configuration information required for initial access from the received system information. The UE may transmit a physical RACH (PRACH) to the base station in consideration of the selected SS/PBCH index, and the base station receiving the PRACH may obtain information on the SS/PBCH block index selected by the UE. The base station can know that the terminal has selected a certain block from each of the SS/PBCH blocks and monitors the related control resource set #0.

Next, downlink control information (DCI) in the 5G wireless communication system will be described in detail.

In the 5G system, scheduling information for uplink data (or physical uplink data channel (Physical Uplink Shared Channel, PUSCH)) or downlink data (or physical downlink data channel (Physical Downlink Shared Channel, PDSCH)) is through DCI It may be transmitted from the base station to the terminal. The UE may monitor the DCI format for fallback and the DCI format for non-fallback for PUSCH or PDSCH. The DCI format for countermeasures may be composed of a fixed field predetermined between the base station and the terminal, and the DCI format for non-prevention may include a configurable field.

DCI may be transmitted through a physical downlink control channel (PDCCH), which is a physical downlink control channel, through a channel coding and modulation process. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC may be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs may be used according to the purpose of the DCI message, for example, UE-specific data transmission, a power control command, or a random access response. That is, the RNTI is not explicitly transmitted, but included in the CRC calculation process and transmitted. Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the assigned RNTI. If the CRC check result is correct, the UE can know that the message has been transmitted to the UE.

For example, DCI scheduling PDSCH for system information (SI) may be scrambled with SI-RNTI. DCI scheduling a PDSCH for a random access response (RAR) message may be scrambled with an RA-RNTI. DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI. DCI notifying SFI (Slot Format Indicator) may be scrambled with SFI-RNTI. DCI notifying Transmit Power Control (TPC) may be scrambled with TPC-RNTI. DCI for scheduling UE-specific PDSCH or PUSCH may be scrambled with Cell RNTI (C-RNTI), Modulation Coding Scheme C-RNTI (MCS-C-RNTI), or Configured Scheduling RNTI (CS-RNTI).

DCI format 0_0 may be used as a DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 0_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 4]

DCI format 0_1 may be used as non-preparation DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 0_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 5]

DCI format 1_0 may be used as a DCI for scheduling PDSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 1_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 6]

DCI format 1_1 may be used as non-preparation DCI for scheduling PDSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 1_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 7]

Hereinafter, a method of allocating time domain resources for a data channel in a 5G wireless communication system will be described.

The base station provides a table for time domain resource allocation information for a downlink data channel (Physical Downlink Shared Channel; PDSCH) and an uplink data channel (Physical Uplink Shared Channel; PUSCH) to the UE higher layer signaling (e.g., RRC signaling). For PDSCH, a table consisting of maxNrofDL-Allocations=16 entries may be configured, and for PUSCH, a table configured with maxNrofUL-Allocations=16 entries may be configured. The time domain resource allocation information includes, for example, PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted by K0) or PDCCH-to-PUSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted by K2), the PDSCH or PUSCH is scheduled in the slot Information on the position and length of the start symbol, a mapping type of PDSCH or PUSCH, etc. may be included. For example, information such as [Table 8] and [Table 9] may be notified from the base station to the terminal.

[Table 8]

[Table 9]

The base station may notify the UE of one of the entries in the table for time domain resource allocation information through L1 signaling (eg, DCI) (eg, it may be indicated by a 'time domain resource allocation' field in DCI) . The UE may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

Hereinafter, a method of allocating a frequency domain resource for a data channel in a 5G wireless communication system will be described.

In the 5G wireless communication system, two types, resource allocation type 0 and Supports resource allocation type 1.

Resource allocation type 0

- RB allocation information may be notified from the base station to the terminal in the form of a bitmap for a resource block group (RBG). At this time, the RBG may be composed of a set of consecutive VRBs (Virtual RBs), and the size P of the RBG is based on a value set by a higher layer parameter ( rbg-Size ) and a size value of the bandwidth part defined in the table below. can be determined by

[Table 10] Nominal RBG size P

인 대역폭 파트 i의 총 RBG의 수 (

)는 하기와 같이 정의될 수 있다.- size

the total number of RBGs in bandwidth part i (

) may be defined as follows.

비트 크기의 비트맵의 각 비트들은 각각의 RBG에 대응될 수 있다. RBG들은 대역폭파트의 가장 낮은 주파수 위치에서 시작하여 주파수가 증가하는 순서대로 인덱스가 부여될 수 있다. 대역폭파트 내의

개의 RBG들에 대하여, RBG#0에서부터 RBG#(

-1)이 RBG 비트맵의 MSB에서부터 LSB로 매핑될 수 있다. 단말은 비트맵 내의 특정 비트 값이 1일 경우, 해당 비트 값에 대응되는 RBG가 할당되었다고 판단할 수 있고, 비트맵 내의 특정 비트 값이 0일 경우, 해당 비트 값에 대응되는 RBG가 할당되지 않았다고 판단할 수 있다.-

Each bit of the bit-sized bitmap may correspond to each RBG. RBGs may be indexed in the order of increasing frequency starting from the lowest frequency position of the bandwidth part. within the bandwidth

For RBGs, from RBG#0 to RBG#(

-1) may be mapped from the MSB to the LSB of the RBG bitmap. When a specific bit value in the bitmap is 1, the UE may determine that the RBG corresponding to the bit value is allocated, and when the specific bit value in the bitmap is 0, the RBG corresponding to the bit value is not allocated. can judge

Resource Allocation Type 1

)과 연속적으로 할당된 RB의 길이 (

)로 구성될 수 있다. 보다 구체적으로,

크기의 대역폭파트 내의 RIV는 하기와 같이 정의될 수 있다.- RB allocation information may be notified from the base station to the terminal as information on the start position and length of the continuously allocated VRBs. In this case, interleaving or non-interleaving may be additionally applied to consecutively allocated VRBs. The resource allocation field of resource allocation type 1 may consist of a Resource Indication Value (RIV), and the RIV is the starting point (

) and the length of consecutively allocated RBs (

) may consist of More specifically,

The RIV in the bandwidth part of the size may be defined as follows.

The base station may set the resource allocation type to the UE through higher layer signaling (eg, the higher layer parameter resourceAllocation may be set to one of resourceAllocationType0, resourceAllocationType1, or dynamicSwitch). If the UE receives both resource allocation types 0 and 1 (or if the higher layer parameter resourceAllocation is set to dynamicSwitch in the same way), in the MSB (Most Significant Bit) of the field indicating resource allocation in the DCI format indicating scheduling It may indicate whether the corresponding bit is resource allocation type 0 or resource allocation type 1. In addition, based on the indicated resource allocation type, resource allocation information may be indicated through the remaining bits except for the bit corresponding to the MSB, and the UE may interpret the resource allocation field information of the DCI field based on this. If one of resource allocation type 0 or resource allocation type 1 is configured for the UE (or if the upper layer parameter resourceAllocation is set to one of the values of resourceAllocationType0 or resourceAllocationType1), the resource allocation in the DCI format indicating scheduling is indicated. The resource allocation information may be indicated based on the resource allocation type in which the field is set, and the UE may interpret the resource allocation field information of the DCI field based on this.

Hereinafter, a downlink control channel in a 5G wireless communication system will be described in more detail with reference to the drawings.

4 is a diagram illustrating an example of a control resource set (CORESET) through which a downlink control channel is transmitted in a 5G wireless communication system.

Referring to FIG. 4 , two control resource sets (control resource set #1 (401), control resource set #2) within a bandwidth part of the terminal (UE bandwidth part) 410 on the frequency axis and 1 slot 420 on the time axis 402) may be set. The control resource sets 401 and 402 may be set to a specific frequency resource 403 within the entire terminal bandwidth part 410 on the frequency axis. In addition, the control resource sets 401 and 402 may be set with one or a plurality of OFDM symbols on the time axis, and this may be defined as a Control Resource Set Duration (404). 4, the control resource set #1 (401) is set to a control resource set length of 2 symbols, and the control resource set #2 (402) is set to a control resource set length of 1 symbol. have.

The control resource set in the aforementioned 5G wireless communication system may be set by the base station to the terminal through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling). Setting the control resource set to the terminal means providing information such as a control resource set identifier (Identity), a frequency position of the control resource set, and a symbol length of the control resource set. For example, it may include the following information.

[Table 11]

In [Table 11], tci-StatesPDCCH (simply referred to as Transmission Configuration Indication (TCI) state) configuration information is one or more SS (Quasi Co Located) in a QCL (Quasi Co Located) relationship with DMRS transmitted from a corresponding control resource set. Synchronization Signal)/Physical Broadcast Channel (PBCH) block index or CSI-RS (Channel State Information Reference Signal) index information may be included.

5 is a diagram illustrating the structure of a downlink control channel of a 5G wireless communication system. That is, FIG. 5 is a diagram showing an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in a 5G wireless communication system.

Referring to FIG. 5 , a basic unit of time and frequency resources constituting a control channel may be referred to as a resource element group (REG) 503, and the REG 503 has one OFDM symbol 501 on the time axis and one OFDM symbol 501 on the frequency axis. 1 PRB (Physical Resource Block, 502), that is, it may be defined as 12 subcarriers. The base station may configure a downlink control channel allocation unit by concatenating the REG 503 .

5, when a basic unit to which a downlink control channel is allocated in a 5G wireless communication system is referred to as a Control Channel Element (CCE) 504, one CCE 504 may be composed of a plurality of REGs 503. have. If the REG 503 shown in FIG. 5 is described as an example, the REG 503 may be composed of 12 REs, and if 1 CCE 504 is composed of 6 REGs 503, 1 CCE 504 . may be composed of 72 REs. When the downlink control resource set is set, the corresponding region may be composed of a plurality of CCEs 504, and a specific downlink control channel may have one or a plurality of CCEs 504 according to an aggregation level (AL) in the control resource set. ) can be mapped and transmitted. The CCEs 504 in the control resource set are divided by numbers, and in this case, the numbers of the CCEs 504 may be assigned according to a logical mapping scheme.

The basic unit of the downlink control channel shown in FIG. 5 , that is, the REG 503 , may include both REs to which DCI is mapped and a region to which a DMRS 505 , which is a reference signal for decoding them, is mapped. As in FIG. 5 , three DMRSs 505 may be transmitted within one REG 503 . The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 according to an aggregation level (AL), and the number of different CCEs is the link adaptation of the downlink control channel. can be used to implement For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The UE needs to detect a signal without knowing information about the downlink control channel. For blind decoding, a search space indicating a set of CCEs is defined. The search space is a set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode on a given aggregation level, and various aggregations that make one bundle with 1, 2, 4, 8, or 16 CCEs. Since there is a level, the terminal may have a plurality of search spaces. A search space set may be defined as a set of search spaces in all set aggregation levels.

The search space may be classified into a common search space and a UE-specific search space. A group of terminals or all terminals may search the common search space of the PDCCH in order to receive control information common to cells such as dynamic scheduling for system information or a paging message. For example, PDSCH scheduling assignment information for SIB transmission including cell operator information may be received by examining the common search space of the PDCCH. In the case of the common search space, since terminals of a certain group or all terminals need to receive the PDCCH, it may be defined as a set of promised CCEs. The UE-specific scheduling assignment information for the PDSCH or PUSCH may be received by examining the UE-specific search space of the PDCCH. The UE-specific search space may be UE-specifically defined as a function of the UE's identity and various system parameters.

In the 5G wireless communication system, the parameter for the search space for the PDCCH may be set from the base station to the terminal through higher layer signaling (eg, SIB, MIB, RRC signaling). For example, the base station is the number of PDCCH candidates in each aggregation level L, the monitoring period for the search space, the monitoring occasion in symbol units in the slot for the search space, the search space type (common search space or terminal-specific search space), A combination of a DCI format and an RNTI to be monitored in the corresponding search space, a control resource set index for monitoring the search space, etc. may be set to the UE. For example, the parameter for the search space for the PDCCH may include the following information.

[Table 12]

According to the configuration information, the base station may set one or a plurality of search space sets to the terminal. According to an embodiment, the base station may set the search space set 1 and the search space set 2 to the terminal, and may configure the DCI format A scrambled with X-RNTI in the search space set 1 to be monitored in the common search space, and search DCI format B scrambled with Y-RNTI in space set 2 may be configured to be monitored in a UE-specific search space.

According to the configuration information, one or a plurality of search space sets may exist in the common search space or the terminal-specific search space. For example, the search space set #1 and the search space set #2 may be set as the common search space, and the search space set #3 and the search space set #4 may be set as the terminal-specific search space.

In the common search space, a combination of the following DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, MCS-C-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

- DCI format 2_0 with CRC scrambled by SFI-RNTI

- DCI format 2_1 with CRC scrambled by INT-RNTI

- DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

- DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

In the UE-specific search space, a combination of the following DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

- DCI format 1_0/1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

The specified RNTIs may follow the definitions and uses below.

C-RNTI (Cell RNTI): UE-specific PDSCH scheduling purpose

MCS-C-RNTI (Modulation Coding Scheme C-RNTI): UE-specific PDSCH scheduling purpose

TC-RNTI (Temporary Cell RNTI): UE-specific PDSCH scheduling purpose

CS-RNTI (Configured Scheduling RNTI): Semi-statically configured UE-specific PDSCH scheduling purpose

RA-RNTI (Random Access RNTI): Used for scheduling PDSCH in the random access phase

P-RNTI (Paging RNTI): PDSCH scheduling purpose for which paging is transmitted

SI-RNTI (System Information RNTI): Used for scheduling PDSCH in which system information is transmitted

INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is pucturing

TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Purpose of indicating power control command for PUSCH

TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control command for PUCCH

TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control command for SRS

The aforementioned specified DCI formats may follow the definition below.

[Table 13]

In the 5G wireless communication system, the search space of the aggregation level L in the control resource set p and the search space set s may be expressed as the following equation.

[Equation 1]

In the 5G wireless communication system, as a plurality of search space sets may be set with different parameters (eg, parameters in Table 12), the set of search space sets monitored by the terminal at every time point may vary. For example, if the search space set #1 is set to the X-slot period, the search space set #2 is set to the Y-slot period and X and Y are different, the UE searches with the search space set #1 in a specific slot. Both space set #2 can be monitored, and one of search space set #1 and search space set #2 can be monitored in a specific slot.

When a plurality of search space sets are configured for the terminal, the following conditions may be considered in a method for determining the search space set to be monitored by the terminal.

[Condition 1: Limit the maximum number of PDCCH candidates]

The number of PDCCH candidates that can be monitored per slot does not exceed ^{M μ.} M ^μ may be defined as the maximum number of PDCCH candidates per slot in a cell set to a subcarrier interval of 15·2 ^{μ kHz, and may be defined in the table below.}

[Table 14]

[Condition 2: Limit the maximum number of CCEs]

The number of CCEs constituting the entire search space per slot (here, the total search space means the entire set of CCEs corresponding to the union region of a plurality of search space sets) does not exceed ^{C μ.} C ^μ may be defined as the maximum number of CCEs per slot in a cell set to a subcarrier spacing of 15·2 ^{μ kHz, and may be defined in the table below.}

[Table 15]

For convenience of explanation, a situation in which both conditions 1 and 2 are satisfied at a specific time point is defined as "condition A". Therefore, not satisfying condition A may mean not satisfying at least one of conditions 1 and 2 above.

According to the setting of the search space sets of the base station, the condition A may not be satisfied at a specific time point. If condition A is not satisfied at a specific time point, the UE may select and monitor only some of the search space sets configured to satisfy condition A at the corresponding time point, and the base station may transmit the PDCCH to the selected search space set.

The following method may be followed as a method of selecting some search spaces from among the entire set of search spaces.

[Method 1]

If condition A for PDCCH is not satisfied at a specific time point (slot),

The terminal (or the base station) may preferentially select a search space set in which a search space type is set as a common search space from among search space sets existing at a corresponding time, over a search space set set as a terminal-specific search space.

When all search space sets set as the common search space are selected (that is, condition A is satisfied even after selecting all search spaces set as the common search space), the terminal (or the base station) uses the terminal-specific search space You can select search space sets set to . In this case, when there are a plurality of search space sets set as the terminal-specific search space, a search space set having a low search space set index may have a higher priority. In consideration of priority, UE-specific search space sets may be selected within a range in which condition A is satisfied.

6 is a diagram illustrating an example of a discontinuous reception (DRX) operation of a 5G wireless communication system.

Referring to FIG. 6 , discontinuous reception (DRX) is an operation in which a terminal using a service discontinuously receives data in an RRC connected state in which a radio link is established between a base station and a terminal. When DRX is applied, the terminal turns on the receiver at a specific point in time to monitor the control channel, and if there is no data received for a certain period of time, turns off the receiver to reduce power consumption of the terminal. DRX operation may be controlled by the MAC layer device based on various parameters and timers.

Referring to FIG. 6 , an active time 605 is a time during which the UE wakes up every DRX cycle and monitors the PDCCH. Active time 605 may be defined as follows.

- drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running; or

- a Scheduling Request is sent on PUCCH and is pending; or

- a PDCCH indicating a new transmission addressed to the C-RNTI of the MAC entity has not been received after successful reception of a Random Access Response for the Random Access Preamble not selected by the MAC entity among the contention-based Random Access Preamble

drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer, etc. are timers whose values are set by the base station, and provide a function of setting the terminal to monitor the PDCCH when a predetermined condition is satisfied. Have.

The drx-onDurationTimer 615 is a parameter for setting the minimum time that the terminal is awake in the DRX cycle. The drx-InactivityTimer 620 is a parameter for setting an additional awake time of the terminal when receiving 630 a PDCCH indicating new uplink transmission or downlink transmission. The drx-RetransmissionTimerDL is a parameter for setting the maximum time that the UE is awake in order to receive downlink retransmission in the downlink HARQ procedure. drx-RetransmissionTimerUL is a parameter for setting the maximum time that the terminal is awake in order to receive an uplink retransmission grant (grant) in the uplink HARQ procedure. drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL and drx-RetransmissionTimerUL may be set as, for example, time, number of subframes, number of slots, and the like. ra-ContentionResolutionTimer is a parameter for monitoring the PDCCH in the random access procedure.

The inActive time 610 is a time set not to monitor the PDCCH or/or a time set not to receive the PDCCH during DRX operation. (610). If the UE does not monitor the PDCCH during the active time 605, the UE may enter a sleep or inActive state to reduce power consumption.

The DRX cycle means a cycle in which the UE wakes up and monitors the PDCCH. That is, after the UE monitors a PDCCH, it means a time interval or an on-duration generation period until monitoring the next PDCCH. There are two types of DRX cycle: short DRX cycle and long DRX cycle. Short DRX cycle may be selectively applied.

The Long DRX cycle 625 is the longest of the two DRX cycles set in the terminal. The UE starts the drx-onDurationTimer 615 again when the Long DRX cycle 625 has elapsed from the starting point (eg, start symbol) of the drx-onDurationTimer 615 while operating in Long DRX. When operating in the Long DRX cycle (625), the UE may start the drx-onDurationTimer (615) in the slot after the drx-SlotOffset in the subframe that satisfies the following [Equation 2]. Here, drx-SlotOffset means a delay before starting the drx-onDurationTimer 615 . drx-SlotOffset may be set to, for example, time, number of slots, and the like.

[Equation 2]

10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset[(SFN)

10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset

In this case, the drx-LongCycleStartOffset may include the Long DRX cycle 625 and the drx-StartOffset, and may be used to define a subframe in which the Long DRX cycle 625 starts. drx-LongCycleStartOffset may be set as, for example, time, number of subframes, number of slots, and the like.

Short DRX cycle is the shortest of the two DRX cycles defined in the UE. The terminal operates in the Long DRX cycle 625, and when a predetermined event, for example, the case of receiving 630 PDCCH indicating new uplink transmission or downlink transmission, occurs at active time 605, etc. The drx-InactivityTimer 620 is started or restarted, and if the drx-InactivityTimer 620 expires or a DRX command MAC CE is received, it may operate in a short DRX cycle. For example, in FIG. 6 , the UE starts drx-ShortCycleTimer at the expiration time of the previous drx-onDurationTimer 615 or drx-InactivityTimer 620 , and may operate in a short DRX cycle until the drx-ShortCycleTimer expires. When the terminal receives 630 PDCCH indicating new uplink transmission or downlink transmission, in anticipation of additional uplink or downlink transmission in the future, the Active Time 605 or InActive Time 610 is extended. may delay the arrival of During operation with short DRX, the UE starts drx-onDurationTimer 615 again when a short DRX cycle has elapsed from the start point of the previous On duration. After that, when the drx-ShortCycleTimer expires, the UE operates as a Long DRX cycle 625 again.

When operating in a short DRX cycle, the UE may start the drx-onDurationTimer 615 after drx-SlotOffset in a subframe satisfying Equation 3 below. Here, drx-SlotOffset means a delay before starting the drx-onDurationTimer 615 . drx-SlotOffset may be set to, for example, time, number of slots, and the like.

[Equation 3]

10) + subframe number] modulo (drx-ShortCycle) = (drx-StartOffset) modulo (drx-ShortCycle)[(SFN)

10) + subframe number] modulo (drx-ShortCycle) = (drx-StartOffset) modulo (drx-ShortCycle)

Here, drx-ShortCycle and drx-StartOffset may be used to define a subframe for starting a Short DRX cycle. drx-ShortCycle and drx-StartOffset may be set, for example, as time, number of subframes, number of slots, and the like.

So far, the DRX operation has been described with reference to FIG. 6 . According to an embodiment, the terminal may reduce power consumption of the terminal by performing a DRX operation. However, even if the terminal performs the DRX operation, the terminal does not always receive the PDCCH associated with the terminal at the active time 605 .

Hereinafter, a carrier aggregation and scheduling method in a 5G wireless communication system will be described in detail.

The terminal may access a primary cell through initial access, and the base station may additionally configure one or a plurality of secondary cells in the terminal. The terminal may perform communication through serving cells including primary cells and secondary cells configured by the base station.

The base station may additionally set whether to perform cross-carrier scheduling for cells configured in the terminal. For convenience of explanation, when cross-carrier scheduling is configured, a cell that performs scheduling (ie, a cell that receives downlink control information corresponding to downlink assignment or uplink grant) is collectively referred to as a “first cell”. and a cell in which scheduling is performed (ie, a cell in which downlink or uplink data is actually scheduled and transmitted/received based on downlink control information) is called a “second cell”. If the terminal receives cross-carrier scheduling for a specific cell A (scheduled cell, Scheduled Cell) from the base station (in this case, cell A corresponds to the "second cell"), the terminal monitors the PDCCH for the cell A is not performed in cell A, but may be performed in another cell B indicated by cross-carrier scheduling, that is, a scheduling cell (in this case, cell B corresponds to the “first cell”). For the purpose of the base station setting cross-carrier scheduling in the terminal, information on the "first cell" that performs scheduling on the "second cell" (eg, the cell index of the cell corresponding to the "first cell") ), a carrier indicator field (CIF) value for the "second cell", and the like. For example, the following configuration information may be notified from the base station to the terminal through higher layer signaling (eg, RRC signaling).

[Table 16]

The UE may monitor the PDCCH for the cell configured for cross-carrier scheduling in a cell corresponding to the “first cell”. The terminal may determine the index of the cell scheduled by the DCI received from the carrier indicator field value in the DCI format for scheduling data, and based on this, data may be transmitted/received in the cell indicated by the carrier indicator.

The scheduled cell (Cell A) and the scheduled cell (Cell B) may be configured with different numerology. Here, the numerology may include a subcarrier interval, a cyclic prefix, and the like. When cell A and cell B have different numerologies, when the PDCCH of cell B schedules the PDSCH of cell A, the following minimum scheduling offset between the PDCCH and the PDSCH may be additionally considered.

[Cross-Carrier Scheduling Method]

■ If the subcarrier spacing of cell B (μ _B ) is smaller than the subcarrier spacing of cell A (μ _A ), the PDSCH can be scheduled from the next PDSCH slot corresponding to X symbols from the last symbol of the PDCCH received from cell B. . Here, X may _{vary according to μ B} , and may be defined as _{X=4 symbols when μ B} =15 kHz, X=4 symbols when μ _B =30 kHz, and X=8 symbols when _{μ B =60 kHz.}

■ If the subcarrier spacing of cell B (μ _B ) is larger than the subcarrier spacing of cell A (μ _A ), the PDSCH may be scheduled from the time point after the X symbol from the last symbol of the PDCCH received from cell B. Where X may be defined as when X = 8 symbols, μ _B = 120kHz when X = 4 symbols, μ _B = 60kHz when may vary depending on the _{μ B, μ B = 30kHz,} X = 12 symbols.

Hereinafter, a method of setting a transmission configuration indication (TCI) state, which is a means for indicating or exchanging quasi co-location (QCL) information between a terminal and a base station in a wireless 5G communication system, will be described in detail.

The base station configures and indicates the TCI state between two different RSs or channels through appropriate signaling, so that it is possible to inform the QCL relationship between different RSs or channels. Different RSs or channels are QCLed (QCLed) means that a channel is selected through a certain reference RS antenna port A (reference RS #A) and another target RS antenna port B (target RS #B) in a QCL relationship. In the estimation, it means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated from the antenna port A to the channel measurement from the antenna port B. QCL is based on 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) RRM (radio resource management) affected by average gain, and 4) spatial parameter. Depending on the situation, such as the affected BM (beam management), it may be necessary to correlate different parameters. Accordingly, NR supports four types of QCL relationships as shown in [Table 17] below.

[Table 17]

The Spatial RX parameter is one of various parameters such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit/receive channel correlation, transmit/receive beamforming, spatial channel correlation, etc. It may include some or all.

The QCL relationship can be set to the UE through the RRC parameters TCI-State and QCL-Info as shown in [Table 18] below. Referring to [Table 18], the base station sets one or more TCI states to the UE and informs the UE of up to two QCL relationships (qcl-Type1, qcl-Type2) to the RS referring to the ID of the TCI state, that is, the target RS. have. At this time, each QCL information (QCL-Info) included in each TCI state includes the serving cell index and BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in [Table 17]. can do.

[Table 18]

Hereinafter, a method of setting spatial relation information (SpatialRelationInfo), which is a means for indicating uplink beam information between a terminal and a base station in a 5G wireless communication system, will be described in detail.

The base station sends an uplink channel or signal A (channel or signal referring to the SpatialRelationInfo) through appropriate signaling (SpatialRelationInfo) with another downlink channel or signal or uplink channel or signal B (referenceSignal included in the SpatialRelationInfo setting) relationship can be established. Based on this, the UE may use the same beam direction used for reception or transmission of channel or signal B for transmission of channel or signal A.

The configuration of SpatialRelationInfo may be changed according to the type of an uplink channel or signal referring to it. For example, in the case of SpatialRelationInfo referenced by the SRS resource, referenceSignal information for determining a PUCCH (Physical Uplink Control Channel) transmission beam may be included as shown in the example of [Table 19].

[Table 19]

It has been described above that the TCI state is used for the beam indication of the downlink channel (indicates the reception spatial filter value/type of the UE) and SpatialRelationInfo is used for the beam indication of the uplink channel (indicates the transmission spatial filter value/type of the UE), but this It should be noted that this does not mean a limitation according to the type of uplink and downlink, and mutual extension is possible in the future. For example, in the conventional downlink TCI state (DL TCI state), an uplink channel or signal is added to the type of target RS that can refer to the TCI state, or the type of referenceSignal (reference RS) included in the TCI state or QCL-Info It can be extended to an uplink TCI state (UL TCI state) through a method such as adding an uplink channel or a signal to the UL TCI state. In addition, various extension methods such as DL-UL joint TCI state exist, but not all methods are described in order not to obscure the gist of the description.

7 is a diagram illustrating examples of various operating scenarios of a Sounding Reference Signal (SRS) according to an embodiment of the present disclosure.

Referring to FIG. 7 , at least the following three SRS operation scenarios may exist in the NR system.

One) The base station 705 sets a beam in one direction to the terminal 700 (in this disclosure, to configure a beam / precoding in one direction does not apply beam / precoding or wide beam (cell-coverage or sector coverage)) In the case of periodic SRS or semi-persistent SRS, the terminal 700 aligns with the transmission period and offset of the SRS, or in the case of aperiodic SRS, according to the SRS request of the base station (a time determined after the SRS request) In), SRS may be transmitted. In this case, additional information for beam/precoding may not be required for SRSs.

2) The base stations 715 and 720 may set beams to the terminal 710 in one or more directions, and the terminal 710 may transmit a plurality of beamformed SRSs in one or more configured directions. For example, as shown in the example of FIG. 7 , it is possible to configure SRS resource (or port) #0 to be beamformed to the base station 715 and SRS resource (or port) #1 to be beamformed to the base station 720 . In this case, the base stations 715 and 720 need to inform not only the SRS request but also the SRS beam/precoding information, unlike the method 1).

3) The base station 730 may set beams to the terminal 725 in one or more directions, and the terminal 725 may transmit a plurality of SRS beamformed in one or more directions. For example, as in the example of FIG. 7 , the base station applies different beams/precodings to SRS resource (or port) #0, SRS resource (or port) #1, and SRS resource (or port) #2. can be set to transmit. Through this, stable communication can be performed through beam/precoder diversity even when the mobility of the terminal is high. For example, the terminal 725 provides channel state information to the base station 730 with SRS #2 at time A, and provides channel state information to the base station 730 with SRS#0 at time A+alpha. can do. In this case, the base station 730 needs to inform the SRS beam/precoding information as well as the SRS request differently from the method 1).

Although the above descriptions are based on SRS transmission, similarly, it is possible to extend to other UL channels such as PRACH, PUSCH, PUCCH, and/or RS transmission, and detailed descriptions of all cases are omitted so as not to obscure the gist of the present disclosure. .

8 is a diagram illustrating an uplink transmission structure of a 5G or NR system according to an embodiment of the present disclosure.

Referring to FIG. 8, a transmission basic unit of a 5G or NR system is a slot 800, and assuming a general cyclic prefix (CP) length, each slot consists of 14 symbols 805, and one symbol is It may correspond to one UL waveform (CP-OFDM or DFT-S-OFDM) symbol.

A resource block (RB) 810 is a resource allocation unit corresponding to one slot based on the time domain, and may consist of 12 subcarriers based on the frequency domain.

The uplink structure can be largely divided into a data area and a control area. Unlike the LTE system, in the 5G or NR system, the control region may be set and transmitted at an arbitrary position in the uplink. Here, the data region includes a series of communication resources including data such as voice and packets transmitted to each terminal, and corresponds to the remaining resources except for the control region in the subframe. The control region may include a series of communication resources for a downlink channel quality report from each terminal, reception ACK/NACK for a downlink signal, an uplink scheduling request, and the like.

The terminal can transmit its own data and control information simultaneously in the data region and the control region. A symbol for which the UE can periodically transmit SRS within one slot may be the last six symbol periods 815, and the symbol for transmitting SRS uses a preset SRS transmission band within the UL BWP based on the frequency domain. can be transmitted through However, this is an example, and a symbol capable of transmitting SRS may be extended to another time interval within the slot (eg, to set some of all OFDM symbols in the slot as an SRS resource). RBs capable of transmitting SRS are transmitted in multiples of 4 RBs when transmitted in the frequency domain and may be transmitted in a maximum of 272 RBs.

In addition, in the 5G or NR system, the number of symbols N of SRS may be set to 1, 2, or 4, and may be transmitted in consecutive symbols. In addition, repeated transmission of SRS symbols may be allowed in 5G or NR systems. Specifically, the repetition factor (r) of the SRS symbol is r ∈ {1,2,4}, and may be set as r?N. For example, when one SRS antenna is mapped to one symbol and transmitted, up to 4 symbols may be repeatedly transmitted. Alternatively, four different antenna ports may be transmitted on four different symbols. In this case, since each antenna port is mapped to one symbol, repeated transmission of the SRS symbol is not allowed.

In the case of LTE and NR, SRS may be configured based on the following higher layer signaling information (or a subset thereof).

BandwidthConfig: Set SRS bandwidth information. The exact value of each code point may vary according to the uplink system BW value.

SubframeConfig (or ConfigIndex): Sets the SRS transmission period and transmission offset values. Depending on whether the code point is FDD or TDD, the exact value of each code point may vary.

ackNackSRS-SimultaneousTransmission: ACK/NACK - Informs whether SRS simultaneous transmission or not.

MaxUpPts: In UpPTS, informs whether the frequency position of SRS transmission is initialized.

Hopping: 2-bit information informs whether SRS frequency hopping and hopping location and method.

Frequency domain position: Informs the frequency domain position of SRS transmission.

Duration: Indicates whether Periodic SRS is transmitted.

Transmission comb: Informs the comb offset value during SRS transmission.

Cyclic shift: Indicates a cyclic shift value during SRS transmission.

Antenna port: Informs the number of SRS antenna ports used for SRS transmission. In case of LTE, 1, 2 or 4 ports can be supported.

In the case of the LTE-A system, periodic and aperiodic SRS transmission may be supported based on the above-described configuration information. In the case of the NR system, it is possible to use additional information such as activation/deactivation signaling for SRS resources in addition to the above-described configuration information, and periodic, semi-persistent, and aperiodic SRS transmission can be supported. According to the transmission type of SRS, for example, whether periodic, semi-persistent, or aperiodic SRS transmission is performed, some of the configuration information may be omitted.

The SRS may be configured with a Constant Amplitude Zero Auto Correlation (CAZAC) sequence. In addition, CAZAC sequences constituting each SRS transmitted from multiple terminals may have different cyclic shift values. In addition, CAZAC sequences generated through cyclic shift in one CAZAC sequence may have a characteristic of having a correlation value of zero with sequences having a cyclic shift value different from that of each CAZAC sequence. Sequences having a cyclic shift value different from that of themselves and SRSs simultaneously allocated to the same frequency domain using a characteristic having a zero correlation value may be distinguished according to a CAZAC sequence cyclic shift value set for each SRS by the base station.

SRSs of several terminals may be classified according to frequency positions as well as cyclic shift values. The frequency position may be divided into SRS subband unit allocation or Comb. Comb2 and Comb4 can be supported in 5G or NR systems. In the case of Comb2, one SRS may be allocated only to an even-numbered or odd-numbered subcarrier within the SRS subband. In this case, each of the even-numbered subcarriers and the odd-numbered subcarriers may constitute one Comb.

Each UE may be allocated an SRS subband based on the tree structure. In addition, the UE may perform hopping on the SRS allocated to each subband at each SRS transmission time point. Accordingly, all transmit antennas of the terminal may transmit the SRS using the entire uplink data transmission bandwidth.

9 is a diagram illustrating a structure in which SRS is allocated for each subband according to an embodiment of the present disclosure.

Referring to FIG. 9 , when a data transmission band corresponding to 40 RBs in frequency is provided, an example in which SRS is allocated to each terminal according to a tree structure set by the base station is shown.

When the level index of the tree structure in FIG. 9 is b, the uppermost level (b=0) of the tree structure may consist of one SRS subband having a bandwidth of 40 RBs. In the second level (b=1), two SRS subbands with a bandwidth of 20 RBs may be generated from the SRS subbands of the b=0 level. Accordingly, two SRS subbands may exist in the entire data transmission band of the second level (b=1). In the third level (b=2), 5 4 RB SRS subbands are generated from one 20 RB SRS subband of the level immediately above (b=1), and 10 4RB SRS subbands exist in one level. can have

The tree structure may have various levels, SRS subband sizes, and the number of SRS subbands per level according to the configuration of the base station. Here, the number of SRS subbands in level b generated from one SRS subband of a higher level is N _b , and _{the indexes for these N b} SRS subbands are n _b ={0, ,, ,N _b -1 } can be defined. As the subbands per level vary in this way, as shown in FIG. 9 , a UE may be allocated to each subband per level. _{For example, UE 1 is allocated to the first SRS subband (n 1} =0) among two SRS subbands having a 20 RB bandwidth at b=1 level, and UE 2 and UE 3 each have a second 20 RB SRS The first SRS subband (n ₂ =0) and the third SRS subband (n ₂ =2) positions below the subband may be allocated. Through the processes in which the UE is allocated to each subband for each level, the UE can simultaneously transmit SRS through a plurality of component carriers (CCs), and can transmit the SRS to a plurality of SRS subbands at the same time within one CC.

The base station may configure at least one SRS configuration for each uplink BWP in order to transmit configuration information for SRS transmission to the terminal, and may also configure at least one SRS resource set for each SRS configuration. As an example, the base station and the terminal may send and receive the following signaling information based on Release 15 in order to transmit information about the SRS resource set.

[Table 20]

Here, srs-Config is used to configure SRS transmission and defines the SRS-Resources list and the SRS-ResourceSets list, and the following signaling information can be exchanged.

[Table 21]

resourceType: A time axis transmission setting of the SRS resource referenced in the SRS resource set, and may have one of 'periodic', 'semi-persistent', and 'aperiodic'. If it is set to 'periodic' or 'semi-persistent', the associated CSI-RS information may be provided according to the use of the SRS resource set. If set to 'aperiodic', an aperiodic SRS resource trigger list and slot offset information may be provided, and associated CSI-RS information may be provided according to the usage of the SRS resource set.

usage: A setting for the usage of the SRS resource referenced in the SRS resource set, and may have one of 'beamManagement', 'codebook', 'nonCodebook', and 'antennaSwitching'.

alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: It is possible to provide parameter settings for adjusting the transmit power of the SRS resource referenced in the SRS resource set.

The UE may understand that the SRS resource included in the set of the SRS resource index referenced in the SRS resource set follows the information set in the SRS resource set.

In addition, the base station and the terminal may exchange higher layer signaling information in order to transmit individual configuration information for the SRS resource. As an example, the individual configuration information for the SRS resource may include time-frequency axis mapping information within the slot of the SRS resource, which may include information about frequency hopping within the slot or between slots of the SRS resource. . As another example, the individual configuration information for the SRS resource may include the time axis transmission configuration of the SRS resource, and may have one of 'periodic', 'semi-persistent', and 'aperiodic'. Individual configuration information for SRS resource can be limited to have the same time axis transmission configuration as the SRS resource set including SRS resource. If the time axis transmission setting of the SRS resource is set to 'periodic' or 'semi-persistent', the individual configuration information for the SRS resource may additionally include the SRS resource transmission period and slot offset (eg, periodicityAndOffset). have. As another example, the individual configuration information for the SRS resource may include a configuration for the spatial domain transmission filter of the terminal transmitting the SRS resource, which may be provided through spatial relation info for the SRS. When the spatial relation info included in the individual configuration information for the SRS resource refers to the index of the CSI-RS resource or SSB, the terminal uses the same spatial domain as the spatial domain receive filter used when receiving the referenced CSI-RS resource or SSB. It can be understood as using a transmission filter. Alternatively, when spatial relation info refers to another SRS resource index, it can be understood that the terminal uses the spatial domain transmission filter used when transmitting the referenced SRS resource.

As set by the upper layer parameter, SRS-ResourceSet, the terminal may receive support for one or a plurality of sounding reference signal (SRS) resource sets. For each SRS resource set, the UE may be supported with K (K≥1) SRS resources greater than or equal to 1. At this time, except for the case where the maximum value K is set to 16 by the upper layer parameter [SRS-for-positioning] in the SRS, the maximum value K may be determined by the terminal capability. The use of the SRS resource set may be set according to 'usage' in the upper layer parameter SRS-ResourceSet. When the upper layer parameter 'usage' is set to 'beamManagement', the UE can transmit SRS at a given time instant with only one SRS resource in the SRS set, but another set of SRS resources operating in the same time domain in the same bandwidth part My SRS resources can be transmitted simultaneously.

At least one state for aperiodic SRS may be used to select one from among set SRS resource sets.

The following SRS parameters may be semi-statically set by a higher layer parameter SRS-Resource.

- srs-ResourceId determines the SRS resource configuration identifier.

는 상위 레이어 파라미터 nrofSRS-Ports로 설정될 수 있으며 1,2 혹은 4로 설정될 수 있다. 만약 nrofSRS-Ports가 설정되지 않았다면 nrofSRS-Ports는 1로 설정될 수 있다.- Number of SRS ports

may be set as the upper layer parameter nrofSRS-Ports and may be set to 1,2 or 4. If nrofSRS-Ports is not configured, nrofSRS-Ports may be set to 1.

- The time domain operation of SRS resource allocation indicated by the upper layer parameter resourceType may be one of 'periodic', 'semi-persistent', and 'aperiodic' SRS transmission.

- When the SRS resource type is periodic or semi-persistent, the slot level period and the slot level offset may be determined by higher layer parameters periodicityAndOffset-p or periodicityAndOffset-sp. The UE may expect that SRS resources will not be set in the same SRS resource set SRS-ResourceSet with different slot level periods. When the upper layer parameter resourceType is set to 'aperiodic' for the SRS-ResourceSet, the slot level offset may be defined as the upper layer parameter slotOffset.

- The number of OFDM symbols of the SRS resource, the starting OFDM symbol in the slot, and the repetition factor R may be set by a higher layer parameter resourceMapping. If R is not configured, R may be equal to the number of OFDM symbols in the SRS resource.

- SRS bandwidth B_SRS and C_SRS may be set by higher layer parameter freqHopping. If not set, B_SRS may be 0.

- The frequency hopping bandwidth b_hop may be set by an upper layer parameter freqHopping. If not set, b_hop may be 0.

- The frequency domain position and settable shift can be set by upper layer parameters freqDomainPosition and freqDomainShift, respectively. If freqDomainPosision is not set, the frequency domain position and configurable shift may be zero.

- Cyclic shift may be set by upper layer parameters cyclicShift-n2, cyclicShift-n4, or cyclicShift-n8 for transmission comb values 2, 4, and 8, respectively.

- The transmission comb value can be set by the upper layer parameter transmissionComb.

- Transmission comb offset may be set by upper layer parameters combOffset-n2, combOffset-n4, or combOffset-n8 for transmission comb values 2, 4, and 8, respectively.

- The SRS sequence ID may be set by a higher layer parameter sequenceID.

- The spatial relationship setting between the reference RS and the target SRS may be set by the upper layer parameter spatialRelationInfo including the identifier of the reference RS. SS/PBCH block, CSI-RS configured for the same support cell as the target SRS indicated by the upper layer parameter servingCellId, or the uplink bandwidth part indicated by the upper layer parameter uplinkBWP and the target SRS indicated by the upper layer parameter servingCellID Same support The SRS configured for the cell may be configured as a reference RS. When the SRS is set as the upper layer parameter [SRS-for-positioning], the reference RS may be the DL PRS configured for the support cell, the SS/PBCH block, or the DL PRS of the non-support cell indicated by the higher layer parameter. have.

의 인접한 심볼들이 단말의 SRS 자원으로 설정될 수 있다. 이때, 자원의 각 심볼들은 모든 SRS 안테나 포드들에 맵핑된다. SRS가 상위 레이어 파라미터 [SRS-for-positioning]으로 설정되었을 때, SRS-Resource 내 상위 레이어 파라미터 resourceMapping로 슬롯 내 어떤 위치에서

의 인접한 심볼들을 단말의 SRS 자원으로 설정될 수 있다.In the last 6 symbols of the slot as the upper layer parameter resourceMapping in SRS-Resource

Adjacent symbols of may be set as the SRS resource of the UE. At this time, each symbol of the resource is mapped to all SRS antenna pods. When SRS is set as the upper layer parameter [SRS-for-positioning], at any position in the slot with the upper layer parameter resourceMapping in SRS-Resource

The adjacent symbols of may be set as SRS resources of the UE.

If the UE is not set to [intraUEPrioritization] and the PUSCH and the SRS are transmitted in the same slot for the support cell, the UE may be configured to transmit the SRS after transmitting the PUSCH and the corresponding DM-RS.

If the UE is set to [intraUEPrioritization] and PUSCH transmission overlaps at the same time as the SRS, the UE may not transmit the SRS for the overlapped symbol(s).

When the UE is configured with one or more SRS resources and the upper layer parameter resourceType in the SRS-Resource is set to 'periodic', the following operation may be followed:

- If the UE is configured with the upper layer parameter spatialRelationInfo including the reference 'ssb-Index' identifier, the UE may transmit the target SRS resource with the same spatial domain transmission filter used when receiving the reference SS/PBCH block. If the UE is configured with the upper layer parameter spatialRelationInfo including the identifier of the reference 'csi-RS-Index', the UE uses the same spatial domain transmission filter as used when receiving the reference periodic CSI-RS or the reference semi-persistent CSI-RS. A target SRS resource may be transmitted. If the UE is configured with the upper layer parameter spatialRelationInfo including the reference 'srs' identifier, the UE may transmit the target SRS resource using the same spatial domain transmission filter used when transmitting the reference periodic SRS. If the SRS is set as the upper layer parameter [SRS-for-positioning] and the terminal is set with the upper layer parameter spatialRelationInfo including the identifier of the reference 'DL-PRS-ResourceId', the terminal is the same as the one used when receiving the reference DL PRS. A target SRS resource may be transmitted with a spatial domain transmission filter.

When the UE is configured with one or more SRS resources and the upper layer parameter resourceType in the SRS-Resource is set to 'semi-persistent', the following operation may be followed:

이후 첫번째 슬롯부터 시작하도록 적용될 수 있다. 여기서

는 PUCCH의 부반송파 설정이다. 활성화 명령은 참조 목록에 의해 활성화된 SRS 자원 세트의 요소 당 하나의 참조 신호 식별자로 설정되는 공간 관계 가정 또한 포함할 수 있다. 목록 내 각 식별자는 참조 SS/PBCH 블록, SRS 자원 세트와 동일한 지원 셀이 존재한다면 활성화 명령 내 Resource Serving Cell ID 영역에 의해 지시되는 지원 셀에 설정된 NZP-CSI-RS 자원, 혹은 SRS 자원 세트와 동일한 지원 셀과 대역폭파트가 존재한다면 활성화 명령 내 Resource Serving Cell ID 영역과 Resource BWP ID 영역에 의해 지시되는 지원 셀과 상향링크 대역폭파트에 설정된 SRS 자원을 참조할 수 있다. SRS가 상위 레이어 파라미터 [SRS-for-positioning]으로 설정될 때, 참조 신호 식별자 목록 내 각 식별자는 비-지원 셀의 참조 SS/PBCH 블록 혹은 상위 레이어 파라미터에 의해 지시되는 지원 혹은 비-지원 셀의 DL PRS 또한 참조할 수 있다.- When the terminal receives an activation command for the SRS resource and the terminal transmits the HARQ-ACK for the PDSCH including the activation command to the PUCCH in slot n, the operation for SRS transmission corresponding to the set SRS resource set and terminal home this slot

Thereafter, it may be applied to start from the first slot. here

is the subcarrier configuration of PUCCH. The activation command may also include a spatial relationship assumption set to one reference signal identifier per element of the SRS resource set activated by the reference list. Each identifier in the list is the same as the NZP-CSI-RS resource or SRS resource set set in the support cell indicated by the Resource Serving Cell ID field in the activation command if the same support cell as the reference SS/PBCH block, SRS resource set exists. If the support cell and the bandwidth part exist, the SRS resource set in the support cell and uplink bandwidth part indicated by the Resource Serving Cell ID field and the Resource BWP ID field in the activation command may be referred to. When the SRS is set as the upper layer parameter [SRS-for-positioning], each identifier in the reference signal identifier list is the reference SS/PBCH block of the non-support cell or the support or non-support cell indicated by the higher layer parameter. See also DL PRS.

- If the SRS resource in the activated resource set is set as the upper layer parameter spatialRelationInfo, the UE may assume that the identifier of the reference signal in the activation command takes precedence over the identifier set in the spatialRelationInfo.

이후 첫 슬롯부터 시작하도록 적용될 수 있다. 여기서

는 는 PUCCH의 부반송파 설정이다.- When the UE receives a deactivation command for the activated SRS resource set and transmits the PUCCH including HARQ-ACK information corresponding to the PDSCH including the deactivation command to slot n, SRS transmission corresponding to the deactivated SRS resource set is stopped The operation and terminal assumptions for the slot are

Thereafter, it may be applied to start from the first slot. here

is the subcarrier configuration of the PUCCH.

- If the UE is set with the upper layer parameter spatialRelationInfo including the identifier of the reference 'ssb-Index', the UE may transmit the target SRS resource with the same spatial domain transmission filter used when receiving the reference SS/PBCH block. If the upper layer parameter spatialRelationInfo includes the identifier of the reference 'csi-RS-Index', the UE transmits the target SRS resource with the same spatial domain transmission filter used when receiving the reference periodic CSI-RS or the reference semi-persistent CSI-RS. can be transmitted If the upper layer parameter spatialRelationInfo includes the identifier of the reference 'srs', the UE may transmit the target SRS resource using the same spatial domain transmission filter used when transmitting the reference periodic SRS or the reference semi-persistent SRS. If the SRS is set as the upper layer parameter [SRS-for-positioning] and the upper layer parameter spatialRelationInfo includes the identifier of the reference 'DL-PRS-ResourceId', the UE uses the same spatial domain transmission filter as used when receiving the reference DL PRS. to transmit the target SRS resource.

If the UE is configured as a dynamic semi-persistent SRS resource and does not receive a deactivation command, it is determined that the semi-persistent SRS configuration is dynamic in the dynamic UL bandwidth part, otherwise it may be determined to be stopped.

When the UE is configured with one or more SRS resources and the upper layer parameter resourceType in the SRS-Resource is set to 'aperiodic', the following operation may be followed:

- The UE may receive the SRS resource set configuration.

가 될 수 있다. 다른 경우에는 aperiodic SRS 전송을 트리거하는 PDCCH의 마지막 심볼과 SRS 자원의 첫번째 심볼 간의 최소 시간 간격은

가 될 수 있다. OFDM 심볼 단위의 최소 시간 간격은 PDCCH와 aperiodic SRS 중 최소 부반송파 간격을 기준으로 계산될 수 있다.- The UE may receive a downlink DCI, a group common DCI, or an uplink DCI-based command. The code point of the received DCI may trigger one or multiple SRS resource sets. The minimum time interval between the last symbol of the PDCCH that triggers aperiodic SRS transmission for the SRS of the resource set whose purpose is set to 'codebook' or 'antennaSwitching' and the first symbol of the SRS resource is

can be In other cases, the minimum time interval between the last symbol of the PDCCH that triggers aperiodic SRS transmission and the first symbol of the SRS resource is

can be The minimum time interval in units of OFDM symbols may be calculated based on the minimum subcarrier interval among the PDCCH and aperiodic SRS.

여기서 k는 각 트리거된 SRS 자원 세트들에 대한 상위 레이어 파라미터 slotOffset으로 설정되며 트리거된 SRS 전송에 대한 부반송파 간격을 기반으로 한다.

와

는 트리거된 SRS와 트리거 명령을 전송하는 PDCCH 각각에 대한 부반송파 간격 설정이다.

과

는 반송파 집성 (carrier aggregation)을 수행할 때 스케쥴링 반송파와 스케쥴된 반송파를 의미한다.- If the UE receives DCI triggering aperiodic SRS in slot n, the UE may transmit each aperiodic SRS for SRS resource sets triggered in the slot defined below:

Here, k is set as a higher layer parameter slotOffset for each triggered SRS resource set and is based on a subcarrier interval for triggered SRS transmission.

Wow

is the subcarrier interval setting for each of the triggered SRS and the PDCCH transmitting the trigger command.

class

denotes a scheduling carrier and a scheduled carrier when performing carrier aggregation.

- If the UE is set with the upper layer parameter spatialRelationInfo including the reference 'ssb-Index' identifier, the UE may transmit the target SRS resource with the same spatial domain transmission filter used when receiving the reference SS/PBCH block. If the UE is set to the upper layer parameter spatialRelationInfo including the reference 'csi-RS-Index' identifier, the UE uses the reference periodic CSI-RS, the reference semi-persistent CSI-RS, or the most recent aperiodic CSI-RS when receiving The target SRS resource may be transmitted with the same spatial domain transmission filter as the above. If the UE is set with the upper layer parameter spatialRelationInfo including the reference 'srs' identifier, the UE transmits the target SRS resource with the same spatial domain transmission filter used when transmitting the reference periodic SRS, the reference semi-persistent SRS, or the reference aperiodic SRS. can If SRS is set as the upper layer parameter [SRS-for-positioning] and is set as the upper layer parameter spatialRelationInfo including the reference 'DL-PRS-ResourceId' identifier, the terminal uses the spatial domain transmission filter used when receiving the reference DL PRS. A target SRS resource may be transmitted.

이후 첫 슬롯부터 시작하는 SRS 전송에 적용될 수 있다. 업데이트 명령은 참조 목록에 의해 업데이트된 SRS 자원 세트의 요소 당 하나의 참조 신호 식별자로 설정되는 공간 관계 가정을 포함할 수 있다. 목록 내에 각 식별자는 참조 SS/PBCH 블록, SRS 자원 세트와 동일한 지원 셀이 존재한다면 업데이트 명령 내 Resource Serving Cell ID 영역에 의해 지시되는 지원 셀에 설정된 NZP CSI-RS 자원, 혹은 SRS 자원 세트와 동일한 지원 셀과 대역폭파트가 존재한다면 업데이트 명령 내 Resource Serving Cell ID 영역과 Resource BWP ID 영역에 의해 지시되는 지원 셀과 상향링크 대역폭파트에 설정된 SRS 자원을 참조할 수 있다. 단말이 SRS-ResourceSet 내 상위 레이어 파라미터 usage가 'antennaSwitching'으로 설정되었을 때, 단말은 동일한 SRS 자원 세트 내 SRS 자원들과 다른 공간 관계로 설정되는 것을 예상하지 않을 수 있다.- When the UE receives the spatial relation update command for the SRS resource and the HARQ-ACK corresponding to the PDSCH including the update command is transmitted in the slot n, the operation and the UE assumption for the spatial relation update of the SRS resource is the slot

Thereafter, it may be applied to SRS transmission starting from the first slot. The update command may include a spatial relationship assumption set to one reference signal identifier per element of the SRS resource set updated by the reference list. In the list, each identifier is a reference SS/PBCH block, if the same support cell as the SRS resource set exists, the NZP CSI-RS resource set in the support cell indicated by the Resource Serving Cell ID field in the update command, or the same support as the SRS resource set If the cell and the bandwidth part exist, the SRS resource set in the support cell and uplink bandwidth part indicated by the Resource Serving Cell ID field and the Resource BWP ID field in the update command may be referred to. When the UE sets the upper layer parameter usage in the SRS-ResourceSet to 'antennaSwitching', the UE may not expect to be set in a different spatial relationship with the SRS resources in the same SRS resource set.

The UE may not expect to be configured with different time domain operations for SRS resources within the same SRS resource set. In addition, the UE may not expect that the SRS resource set associated with the SRS resource is set to a different time domain operation. The SRS request region included in DCI formats 0_1, 1_1, 0_2 (when the SRS request region exists), and 1_2 (when the SRS request region exists) may indicate a triggered SRS resource set as shown in Table 22 below. If the upper layer parameter srs-TPC-PDCCH-Group for the UE is set to 'typeB', the 2-bit SRS request region included in DCI format 2_3 may indicate a triggered SRS resource set. Or, if the upper layer parameter srs-TPC-PDCCH-Group for the terminal is set to 'typeA', the 2-bit SRS request region included in DCI format 2_3 indicates SRS transmission for the set of support cells configured by the upper layer. can

[Table 22]

For PUCCH and SRS scheduled on the same carrier, semi-persistent SRS and periodic SRS are configured in the same symbol as PUCCH including only CSI report, L1-RSRP report, or L1-SINR report only. may not transmit SRS. A semi-persistent SRS or periodic SRS is configured in the same symbol as the PUCCH including HARQ-ACK, link restoration request and/or SR (Scheduling Request), or aperiodic SRS is triggered to be transmitted in the same symbol as PUCCH including the above information , the terminal may not transmit the SRS. If SRS is not transmitted while overlapping with PUCCH, only SRS symbol(s) overlapping with PUCCH may be dropped. When aperiodic SRS is triggered to overlap the same symbol as PUCCH including only semi-persistent/periodic CSI report or semi-persistent/periodic L1-RSRP report or L1-SINR report, PUCCH may not be transmitted.

In the case of a band-band combination in which simultaneous transmission of SRS and PUCCH/PUSCH is not allowed for intra-band frequency aggregation or inter-band frequency aggregation, the UE may have SRS in the same symbol. It is not expected that PUSCH/UL DM-RS/UL PT-RS/PUCCH formats will be configured from a carrier different from the configured carrier.

In the case of a band-band combination in which simultaneous transmission of SRS and PRACH is not allowed for intra-band frequency aggregation or inter-band frequency aggregation, SRS from one carrier and SRS from another carrier PRACH may not be transmitted at the same time.

When the SRS resource in which the upper layer parameter resourceType is set to 'aperiodic' is triggered on OFDM symbol(s) for periodic/semi-persistent SRS transmission, the UE transmits an aperiodic SRS resource, and periodic/ overlapped with the corresponding symbol(s) Semi-persistent SRS symbol(s) are dropped, and non-overlapping periodic/semi-persistent SRS symbol(s) may be transmitted. When the SRS resource for which the upper layer parameter resourceType is set to 'semi-persistent' is triggered in OFDM symbol(s) for periodic SRS transmission, the UE transmits the semi-persistent SRS resource and periodic SRS symbol(s) during the overlapping symbol is dropped and non-overlapping periodic SRS symbol(s) may be transmitted.

When the UE has set the upper layer parameter usage in the SRS-ResourceSet to 'antennaSwitcing' and the guard period of the Y symbol is set, the UE can follow the same priority rule as previously defined as the SRS is set even during the guard period.

When activating or updating the upper layer parameter spatialRelationInfo of the semi-persistent or aperiodic SRS resource with MAC CE for the CC / bandwidth part indicated by a set of upper layer parameter [applicableCellList], all bandwidth parts within the indicated CCs spatialRelationInfo may be applied to semi-persistent or aperiodic SRS resource(s) having the same SRS resource ID.

The upper layer parameter spatialRelationInfo for the SRS resource is FR2, except when the upper layer parameter enableDefaultBeamPlForSRS is set to 'enable' and the upper layer parameter usage of the SRS resource is set to 'beamManagement' or to 'nonCodebook' with the associatedCSI-RS setting When not set in and the upper layer parameter pathlossReferenceRS for the UE is not set, the UE may transmit the target SRS resource according to the setting below.

- The target SRS resource can be transmitted with the same spatial domain transmission filter as that of the CORESET having the lowest controlResoureSetID in the activated DL bandwidth part within the CC.

- If no CORESET is set in the CC, the UE may transmit the target SRS resource with the same spatial domain transmission filter as that which received the activated TCI state of the lowest ID applicable to the PDSCH in the active DL bandwidth part of the CC.

Hereinafter, the SRS switching operation in the 5G wireless communication system will be described in detail.

[Table 23]

Hereinafter, a method of controlling an SRS request and TPC for an SRS transmission operation of a terminal using DCI format 2_3 in a 5G wireless communication system will be described in detail.

[Table 24]

Hereinafter, a method of performing transmission power control for SRS, ie, transmission power control (TPC) in a 5G wireless communication system, will be described in detail. The base station may control the transmission power for SRS transmission to the terminal through a higher layer signal and an L1 signal. As an example, the base station may instruct the terminal a TPC control command with DCI, and the terminal may control the transmission power for the SRS based on the TPC control command value in the DCI received from the base station. The transmit power value indicated by the TPC control command transmitted from the base station to the terminal may be accumulated and applied to the previous transmit power value or may be applied without accumulation. Whether to accumulate the transmit power value or not may be set by the terminal through higher layer signaling. For example, if the terminal is provided with tpc-accumulation through higher layer signaling, it may perform an accumulating TPC operation, and if tpc-accumulation is not provided through higher layer signaling, a non-accumulating TPC operation may be performed. . If a more specific operation for the transmission power control for the SRS may follow the following contents.

[Table 25]

Hereinafter, higher layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

- MIB (Master Information Block)

- SIB (System Information Block) or SIB X (X=1, 2, ...)

- RRC (Radio Resource Control)

- MAC (Medium Access Control) CE (Control Element)

- UE Capability Reporting

- UE assistance information message

In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more of the following physical layer channels or signaling methods.

-PDCCH (Physical Downlink Control Channel)

- DCI (Downlink Control Information)

- UE-specific DCI

- Group common DCI

- Common DCI

- Scheduling DCI (for example, DCI used for scheduling downlink or uplink data)

- Non-scheduling DCI (for example, DCI not for the purpose of scheduling downlink or uplink data)

- PUCCH (Physical Uplink Control Channel)

- UCI (Uplink Control Information)

<First embodiment>

An embodiment of the present disclosure newly proposes a dormant bandwidth part in a next-generation mobile communication system, and specifically proposes a terminal operation in each bandwidth part when each bandwidth part is transitioned or switched.

10 is a diagram illustrating an example of a method of operating a dormant cell according to an embodiment of the present disclosure. That is, FIG. 10 is a diagram illustrating a state transition or bandwidth part switching procedure for each bandwidth part according to an embodiment of the present disclosure.

Referring to FIG. 10 , the bandwidth part of each cell (eg, SCell) of the terminal may be activated as a normal bandwidth part ( 1001 ), may be activated as a dormant bandwidth part ( 1002 ), or may be deactivated ( 1003 ). ). The bandwidth part of each cell (eg, SCell) of the UE may activate or deactivate the normal bandwidth part or the dormant bandwidth part due to an indication by the configuration information of the RRC message, the MAC control information, or the DCI of the PDCCH. As another method, the bandwidth part of each cell of the terminal may have an active state 1001, an inactive state 1003, or a dormant state 1002, and may have an RRC message configuration information or MAC control information or PDCCH DCI A state transition can be performed due to an instruction.

State transition operation (active or inactive or dormant) or normal bandwidth part for each bandwidth part of the Scell described in the present disclosure, or a dormant bandwidth part is activated, or an initial active bandwidth part activated from dormancy is activated, or normal The operation of deactivating the bandwidth part or the dormant bandwidth part may be performed due to an indication or setting in one of the following cases.

- If the state of the bandwidth part of the SCell is set by the RRC message, or if the bandwidth part of each SCell is set with the RRC message and the dormant bandwidth part is set in the SCell, or if the first active bandwidth part is set as the dormant bandwidth part, the dormant partial bandwidth It may be characterized by starting the SCell by switching or activating and performing an operation in the dormant bandwidth part.

- When Scell activation or deactivation or dormant MAC CE is received,

- when MAC CE is received from normal bandwidth part or dormant to activate or deactivate the first active bandwidth part or dormant bandwidth part;

- When receiving the DCI of the PDCCH to activate or deactivate or switch the first active bandwidth part or dormant bandwidth part from the normal bandwidth part or dormant,

- If the cell dormancy timer is not set in the active state Scell and the set cell inactivation timer expires,

- When the bandwidth part deactivation timer is not set in the active state bandwidth part, and the set bandwidth part state deactivation timer (eg bwpDeactivatedTimer) expires,

- When the cell dormancy timer set in the active state Scell expires,

- When the bandwidth part dormancy timer set in the active state bandwidth part expires,

- When the dormant state Scell deactivation timer set in the dormant state Scell expires,

- When the dormant bandwidth part deactivation timer (dormantBWPDeactivatedTimer) set in the dormant bandwidth part expires,

In addition, the state transition operation or the dormant bandwidth part operation method proposed in the present disclosure may have the following characteristics.

- In the Spcell (Pcell or Pscell) (or the downlink bandwidth part or the uplink bandwidth part of the cell), the dormant bandwidth part cannot be set, but only the normal bandwidth part can be set and always activated. Because Spcell synchronizes and major control signals are transmitted and received, it can always remain active because the connection with the base station is disconnected when the bandwidth part of Spcell is dormant or deactivated or when it operates as the dormant bandwidth part.

- Although it is a bandwidth part of the Scell or SCell, if the PUCCH is configured, the dormant state or the dormant bandwidth part may not be configured. Since there may be other cells that need to send feedback such as HARQ ACK/NACK with PUCCH, the active state or the general bandwidth part must be activated and used.

- Due to these characteristics, the cell deactivation timer (ScellDeactivationTimer) or bandwidth part dormancy timer does not apply to the bandwidth part of Spcell or Spcell and the bandwidth part of Scell or SCell for which PUCCH is set, and can be driven only for other Scells.

- The cell or bandwidth part dormancy timer (ScellHibernationTimer) may have priority over the cell or bandwidth part state deactivation timer (ScellDeactivationTimer). In addition, if one value is set for the timer value in the RRC message, the same value may be applied to all cells. As another method, the base station may set different timer values for each Scell or for each BWP in consideration of characteristics of each Scell or each BWP.

- If the Scell or bandwidth part is not indicated to be activated or dormant in the RRC message, it can basically operate in a deactivated state initially.

In the present disclosure, uplink may indicate an uplink bandwidth part, and downlink may indicate a downlink bandwidth part. This is because only one activated or dormant bandwidth part can be operated for each uplink or downlink.

According to an embodiment of the present disclosure, it is possible to quickly activate the carrier aggregation technology by specifically proposing a method for operating a state transition in the bandwidth part-level proposed above of the present disclosure, and a terminal to conserve the battery of

In the present disclosure, the bandwidth part may be set for each cell in the RRCSetup message, the RRCReconfiguration message, or the RRCResume message as follows. The RRC message may include configuration information for a PCell or Pscell or a plurality of Scells, and may configure a plurality of bandwidth parts for each cell (PCell or Pscell or Scell). When configuring a plurality of bandwidth parts for each cell in the RRC message, a plurality of bandwidth parts to be used in the downlink of each cell may be configured. In the case of an FDD system, the uplink of each cell is distinguished from the downlink bandwidth parts. A plurality of bandwidth parts to be used in . In the case of the TDD system, a plurality of bandwidth parts to be commonly used in the downlink and the uplink of each cell may be configured.

The first method of the information setting method for setting the bandwidth part of each cell (PCell or Pscell or Scell) includes one or a plurality of pieces of information among the following information and introduces a new indicator to the bandwidth part so that each bandwidth part is a general bandwidth may include a method of indicating whether it is a part (eg, a bandwidth part that can be operated or set in an active or inactive state) or a dormant bandwidth part (eg, a bandwidth part that can be operated or set in a dormant state). can For example, the bandwidth part identifier may be used to indicate whether the bandwidth part is dormant or not.

- Downlink bandwidth part setting information of each cell

■ Initial downlink bandwidth part (initial downlink BWP) setting information

■ Multiple bandwidth part setting information and bandwidth part identifier (BWP ID) corresponding to each bandwidth part

■ Cell's downlink initial state setting information (for example, active state, dormant state, or inactive state)

■ Bandwidth part identifier indicating the first active downlink bandwidth part (first active downlink BWP)

■ Bandwidth part identifier indicating the default bandwidth part (default BWP)

■ Bandwidth part identifier indicating dormant bandwidth part or 1-bit indicator indicating dormant bandwidth part for each bandwidth part in bandwidth part setting information

■ Bandwidth part disable timer setting and timer value

- Uplink bandwidth part setting information of each cell

■ Initial uplink bandwidth part (initial uplink BWP) setting information

■ Multiple bandwidth part setting information and bandwidth part identifier (BWP ID) corresponding to each bandwidth part

■ Uplink initial state setting information of the cell (eg, active state, dormant state, or inactive state)

■ Bandwidth part identifier indicating the first active uplink bandwidth part (first active uplink BWP)

■ Bandwidth part identifier indicating dormant bandwidth part or 1-bit indicator indicating dormant bandwidth part for each bandwidth part in bandwidth part setting information

As another method of the information setting method for configuring the bandwidth part of each cell (PCell or Pscell or Scell), the second method includes configuration information necessary to read the PDCCH for the bandwidth part corresponding to the dormant bandwidth part (for example, Search space, PDCCH transmission resource, period, etc.) is not set (another way, the period can be set to be very long together with other configuration information), and for the general bandwidth part, configuration information necessary to read the PDCCH (for example, Search space, PDCCH transmission resource, period, etc.) can be set to distinguish them. Because the dormant bandwidth part does not read the PDCCH to reduce battery consumption of the terminal, performs channel measurement, and reports the channel measurement result to the PCell to enable fast bandwidth part or cell activation and fast uplink Alternatively, this is because it is a bandwidth part for allocating downlink transmission resources. Therefore, in the present disclosure, the dormant bandwidth part may mean a bandwidth part in which configuration information for PDCCH monitoring (eg, search space, PDCCH transmission resource, period, etc.) is not configured, or a bandwidth part indicated by a dormant bandwidth part identifier or Although configuration information for PDCCH monitoring is set, it may mean a bandwidth part configured to monitor with a very long period. In another method, in the present disclosure, the dormant bandwidth part is set not to set PDCCH transmission resources, periods, etc. in the configuration information for PDCCH monitoring, so that PDCCH monitoring is not performed in the cell in which the dormant bandwidth part is set, but search space information or cross-carrier scheduling The configuration information may refer to a bandwidth part configured to receive switching or an indication for a dormant bandwidth part through cross-carrier scheduling in another cell.

Since data transmission and reception is impossible in the dormant bandwidth part, only the PDCCH configuration information (PDCCH-config) may be configured (eg, only search space information) for the dormant bandwidth part (or the first bandwidth part). On the other hand, in the normal bandwidth part (or the second bandwidth part) that is not the dormant bandwidth part, PDCCH monitoring must also be performed and data transmission and reception must be possible. transmission resource or period) and PDSCH configuration information or PUSCH configuration information or random access-related configuration information may be further configured.

Therefore, although the uplink or downlink normal bandwidth part should be set for each cell, the dormant bandwidth part may or may not be set for each cell, and the normal partial bandwidth and/or the dormant partial bandwidth setting depends on the base station implementation for the purpose. can be entrusted Also, depending on the implementation of the base station, the first active bandwidth part, the basic bandwidth part, or the initial bandwidth part may be set as the dormant bandwidth part.

In the dormant bandwidth part, the terminal cannot send and receive data with the base station, does not monitor the PDCCH to confirm the instruction of the base station, does not transmit a pilot signal, but performs channel measurement, and measures the measured frequency/cell/channel The result may be reported periodically or when an event occurs according to the base station setting. Therefore, according to an embodiment, since the terminal does not monitor the PDCCH in the dormant bandwidth part and does not transmit a pilot signal, it is possible to save battery compared to the active mode. In addition, since the deactivation mode and the moon perform the channel measurement report, the base station can use the carrier aggregation technique by quickly activating the cell in which the dormant bandwidth part is set based on the measurement report of the dormant bandwidth part. Also, in an embodiment of the present disclosure, the dormant bandwidth part is set in downlink bandwidth part configuration information, and may be used only for the downlink bandwidth part.

In the present disclosure, a terminal operation for a dormant bandwidth part (dormant BWP) or a terminal operation of the activated SCell when the dormant bandwidth part is activated may be as follows.

- If the terminal is instructed to operate or activate the dormant bandwidth part for the serving cell (PCell or SCell), or if the serving cell (PCell or SCell) bandwidth part (eg, downlink bandwidth part) or serving cell If an instruction to put dormant or an instruction to activate the dormant bandwidth part is received in a DCI (L1 control signal) or MAC CE or RRC message of the PDCCH, or an instruction to switch the bandwidth part (eg downlink bandwidth part) to the dormant bandwidth part If the DCI (L1 control signal) of the PDCCH or the MAC CE or RRC message is received (when an indication is received with the L1 control signal of the PDCCH, the indication may be received on the PDCCH of one's own cell by self-scheduling or cross- An indication may be received on the PDCCH for the cell in the PCell with carrier scheduling) or if the bandwidth part dormant timer has been set and the timer has expired, or if the activated bandwidth part of the activated SCell is the dormant bandwidth part or the activated SCell If the activated bandwidth part of is not a normal bandwidth part, one or a plurality of operations may be performed among the following operations.

■ The uplink bandwidth part or the downlink bandwidth part is switched to the bandwidth part (eg, dormant bandwidth part) set in RRC, and the bandwidth part is activated or dormant.

■ Stop the cell deactivation timer set or running in the cell or bandwidth part.

■ If the bandwidth part dormancy timer is set in the bandwidth part of the cell, stop the bandwidth part dormancy timer.

■ Starts or restarts the dormant bandwidth part deactivation timer in the cell's bandwidth part.

■ Stop the bandwidth part deactivation timer set for the bandwidth part of the cell. This is to prevent unnecessary bandwidth part switching procedures in the cell.

■ A periodic downlink transmission resource (DL SPS or configured downlink assignment) or a configured periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) may be cleared for the bandwidth part of the cell. At this time, the meaning of clearing is that the UE stores configuration information such as period information set in the RRC message, but information on the periodic transmission resource indicated or activated by L1 signaling (eg DCI) is removed and It means no longer in use. The method described above, that is, the operation of clearing the configured periodic downlink transmission resource (DL SPS or configured downlink assignment) or the configured periodic uplink transmission resource (UL SPS or configured uplink grant) is the bandwidth part is active. It can also be performed only when transitioned from to dormant state. This is because, when the bandwidth part transitions from the inactive state to the dormant state, there is no information on periodic transmission resource information indicated by L1 signaling or activated. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is configured or configured and used.

■ It is possible to suspend the use of a periodic uplink transmission resource (configured uplink grant Type 1 set to RRC) set in the bandwidth part of the cell. In this case, the meaning of suspending means that the terminal stores the transmission resource configuration information set in the RRC message, but does not use it anymore. The method described above, that is, the operation of suspending the set periodic uplink transmission resource (configured uplink grant Type 1) may be performed only when the bandwidth part transitions from the active state to the dormant state. This is because, when the bandwidth part transitions from the inactive state to the dormant state, periodic transmission resources are not used. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is configured or configured and used.

■ All HARQ buffers set in the uplink or downlink bandwidth part are emptied.

■ The UE does not transmit SRS for the uplink bandwidth part of the cell.

■ In the bandwidth part of the cell, the UE performs channel measurement (CSI or CQI or PMI or RI or PTI or CRI, etc.) for downlink according to the configuration of the base station and performs measurement report. For example, a channel or frequency measurement report may be periodically performed.

■ Uplink data is not transmitted on the UL-SCH in the bandwidth part of the cell.

■ The random access procedure is not performed on the bandwidth part of the cell.

■ In the bandwidth part of the cell, the UE does not monitor the PDCCH.

■ The UE does not monitor the PDCCH for the bandwidth part of the cell. However, in the case of cross-scheduling, the scheduled cell (eg, PCell) may receive an instruction by monitoring the PDCCH for the cell (eg, SCell).

■ PUCCH or SPUCCH transmission is not performed in the partial bandwidth of the cell.

■ The downlink bandwidth part is dormant, channel measurement is performed and reported, and the uplink bandwidth part of the cell is deactivated and not used. This is because, in the dormant Scell, channel measurement is performed only for the downlink bandwidth part, and the measurement result is reported as the Spcell (Pcell or Pscell) or the uplink bandwidth part of the Scell with PUCCH.

If switching or activation to the dormant bandwidth part is indicated for the downlink or dormancy is indicated for the bandwidth part, the random access procedure may be performed without canceling the downlink. This is because the Scell transmits a preamble in the uplink and receives a random access response in the downlink of the Pcell when performing the random access procedure. Therefore, even if the downlink bandwidth part becomes dormant or is switched to the dormant bandwidth, no problem occurs.

Among the terminal operations for the aforementioned dormant bandwidth part (dormant BWP, dormant band width part) or terminal operations when the dormant bandwidth part is activated, a downlink-related operation is called a "downlink dormant operation" and related to uplink Let the operation be named "uplink dormant operation".

In the present disclosure, when the normal bandwidth part (active BWP, active Band Width Part) of the activated SCell is activated, or when a bandwidth part other than the dormant bandwidth part is activated, the terminal operation is as follows.

- If an instruction to activate a normal bandwidth part (for example, a downlink bandwidth part) or a dormant bandwidth part of the current cell (PCell or SCell) or an instruction to activate a cell is DCI (L1 control signal) of the PDCCH Or, if received in a MAC CE or RRC message, or an instruction to switch a bandwidth part (eg downlink bandwidth part) to an active bandwidth part (or a bandwidth part that is not a dormant partial bandwidth) DCI (L1 control signal) of the PDCCH or If it is received as a MAC CE or RRC message, or if the activated bandwidth part of the currently activated cell is a normal bandwidth part, or if the activated bandwidth part of the currently activated cell is not a dormant bandwidth part (receiving an indication with the L1 control signal of the PDCCH) In this case, an indication may be received from the PDCCH of one's own cell by self-scheduling or an indication may be received from the PDCCH for a cell in a PCell by cross-carrier scheduling.) One or more of the following operations are performed. can be done

■ Switch to and activate the indicated uplink or downlink bandwidth part. Alternatively, the uplink or downlink bandwidth part is switched to a designated bandwidth part (eg, an uplink or uplink first activated bandwidth part) and the bandwidth part is activated.

■ In the activated bandwidth part, the base station transmits a sounding reference signal (SRS) to perform channel measurement for uplink. For example, it may be transmitted periodically.

■ If PUCCH is configured in the activated bandwidth part, PUCCH transmission is performed.

■ Start or restart the bandwidth part or cell deactivation timer. As another method, the bandwidth part or cell deactivation timer may be started or restarted only when the bandwidth part or cell dormancy timer is not set. If the bandwidth part or cell dormancy timer can be set in the RRC message, when the timer expires, the bandwidth part or cell can be put to sleep. For example, a bandwidth part or cell deactivation timer may be started or restarted only in a dormant bandwidth part or cell.

■ If there is a type 1 configuration transmission resource that has been stopped in use, the stored type 1 transmission resource can be initialized and used as the original configuration. The type 1 configuration transmission resource is a periodic transmission resource (uplink or downlink) pre-allocated with an RRC message, and means a transmission resource that can be activated and used with an RRC message.

■ Trigger PHR on bandwidth part.

■ In the activated bandwidth part, the UE may report a channel measurement result (CSI or CQI or PMI or RI or PTI or CRI, etc.) for downlink according to the base station configuration.

■ Monitors the PDCCH to read the indication of the base station in the activated bandwidth part.

■ Monitors the PDCCH to read cross-scheduling for the activated bandwidth part.

■ Starts or restarts the bandwidth part deactivation timer. As another method, the bandwidth part deactivation timer can be started or restarted only when the bandwidth part dormancy timer is not set. If the bandwidth part dormancy timer can be set in the RRC message, when the timer expires, the bandwidth part can be switched to dormant or dormant bandwidth part. For example, the bandwidth part deactivation timer may be started or restarted only in the dormant bandwidth part.

■ If the link bandwidth part idle timer is set for the bandwidth part

◆ Start or restart bandwidth part idle timer for bandwidth part.

Among the terminal operations for a normal bandwidth part other than the aforementioned dormant BWP (dormant Band Width Part) or terminal operations when a normal bandwidth part other than the dormant bandwidth part is activated, the downlink-related operation is defined as "downlink". It is called "non-dormant operation" and an operation related to uplink is called "uplink non-dormant operation".

According to an embodiment of the present disclosure, the terminal indicates an indicator indicating a dormant state for a secondary cell or an indicator indicating a bandwidth change to a dormant bandwidth part through L1 signaling from the base station (this is called a "dormancy indicator"). ) can be received. The dormancy indicator for the aforementioned secondary cell may be configured as follows.

- It may be composed of an N-bit bitmap, and each bit of the bitmap may correspond to one secondary cell or one secondary cell group consisting of a plurality of secondary cells.

- The size of the bitmap may be the same as the number of configured secondary cells or secondary cell groups.

- For example, if "0" is indicated as one bit value of the bitmap, the UE switches the cell state to the dormant state (or dormant bandwidth for all secondary cells in the secondary cell or secondary cell group indicated by the corresponding bit) part) can be activated.

- For example, if "1" is indicated as one bit value of the bitmap, the UE switches the cell state to the active state (or the dormant bandwidth for all secondary cells in the secondary cell or secondary cell group indicated by the corresponding bit) Activating a bandwidth part other than the part, the terminal can receive a bandwidth part other than the dormant bandwidth part from the base station through higher layer signaling).

In an embodiment of the present disclosure, the UE may receive the above-described dormancy indicator through a specific DCI format. That is, the above-described dormancy indicator may be transmitted to the terminal through a specific DCI format. The specific DCI format is a DCI format that does not include scheduling information for data (which may correspond to a non-scheduling DCI, for example, DCI format 2_X (X=0, 1, 2, ...)) or scheduling for data DCI format that may include information (scheduling DCI with scheduling information, for example, DCI format 0_X or DCI format 1_X (which may correspond to X=0, 1, 2, ...)) or scheduling information for data DCI format that can be included but does not actually include scheduling information (scheduling DCI without scheduling information, for example, may correspond to DCI format 0_X or DCI format 1_X (X=0, 1, 2, ...)) may be applicable.

According to an embodiment of the present disclosure, when a specific field value of the DCI format satisfies a specific condition, the UE may assume that the DCI format is a DCI format including the dormancy indicator field. For example, if the UE is configured with a search space set to monitor the PDCCH for a specific DCI format, and if the value of the frequency domain resource allocation field satisfies a specific condition A, the UE converts the DCI format to a DCI including a dormancy indicator field. format can be considered. Specific condition A may correspond to, for example, conditions including the following conditions.

[Condition A]

- The resource allocation type (resourceAllocatino) is set to type 0 (resourceAllocationType0), and all frequency domain resource allocation field values in the corresponding DCI format are '0', or

- The resource allocation type (resourceAllocatino) is set to type 1 (resourceAllocationType1), and all frequency domain resource allocation field values in the corresponding DCI format are '1', or

- The resource allocation type (resourceAllocatino) is set to dynamicSwitch (or equally set to both type 0 and type 1), and all frequency domain resource allocation field values in the DCI format are '0', or ' 1'

If the DCI format including the DCI format dormancy indicator field is determined by satisfying the above-mentioned condition A, a combination of specific fields in the corresponding DCI format may be assumed to be the dormancy indicator field. For example, the UE may interpret the following fields as a dormancy indicator field.

[Field A]

- Modulation and coding scheme

- New data indicator

- Redundancy version

- HARQ process number

- Antenna port (Antenna port(s))

- DMRS sequence initialization

In this case, the UE starts with a Most Significant Bit (MSB) (or Least Significant Bit (LSB)) of each bit of the bitmap corresponding to the dormancy indicator field, and cell indices and ascending order for secondary cells in which the dormancy bandwidth part is set. (or in descending order) may be assumed to be sequentially mapped. For example, when the aforementioned field A consists of a total of N bits and a dormant bandwidth part is set in a total of M secondary cells, starting from the first bit (or the last bit) of the N-bit bitmap, a total of M Indices of the M secondary cells in which dormant bandwidth parts are set for bits may be mapped in ascending (or descending) order from a low index. In this case, if N>M, the UE may assume that all N-M bits are indicated as '0' except for the M bits mapped with the indexes of the secondary cells. For example, if the size of the bitmap corresponding to the above-described dormancy indicator field is 4 bits, and a dormant bandwidth part is set in a total of two secondary cells, cell #2, and cell #3, the terminal selects one of the four bits. It can be assumed that the first bit is mapped to cell #2 and the second bit is mapped to cell #3, and it can be expected to receive the remaining third and fourth bits as '0' values.

As described above, the UE may not transmit the SRS to the dormant cell (or the cell in which the dormant bandwidth part is activated). Hereinafter, a method for triggering SRS transmission by a specific cell will be described.

<Example 1-1>

According to an embodiment of the present disclosure, the base station may instruct the terminal to make an SRS request for one or a plurality of cells through L1 signaling.

11 is a diagram illustrating an example of a downlink control information (DCI) structure indicating SRS transmission according to an embodiment of the present disclosure. That is, FIG. 11 is a diagram illustrating an example of an SRS transmission method using a specific DCI format (eg, DCI format 2_3). The field of the DCI format may be configured differently according to SRS configuration information.

Referring to FIG. 11 , if SRS is set to type A 1100, one SRS request field 1101 triggering SRS transmission in a specific field block in the DCI format and one or more for SRS transmission power control It may consist of TPC fields 1102 and 1103 .

The SRS request field 1101 may request SRS with respect to one cell set including one or a plurality of cells configured as an upper level. Control contents according to the value of the SRS request field may follow, for example, [Table 26] below.

[Table 26]

In the example of FIG. 11 , the base station provides a set of three cells through upper layer signaling to the terminal, cell set #1 = {cell #1, cell #2}, cell set #2 = {cell #1, cell #3} , an example in which cell set #3 = {cell #2, cell #3} is set is shown. Accordingly, each value of the SRS request field is '00' for no SRS trigger, '01' for SRS trigger for cell set #1, '10' for SRS trigger for cell set #2, and '11 for cell set # Each of the 3 SRS triggers may be mapped.

The TPC fields TPC#11102 and TPC#21103 may be mapped one-to-one to cells in the cell set indicated by the SRS request indicator field, respectively. For example, when the specific SRS request (1101) field requests SRS transmission for cell set #1 (that is, when '01' is indicated in the example of FIG. 11), TPC#1 (1102) and TPC# 2 1103 may be mapped to cell #1 and cell #2 in cell set #1, respectively. In this case, the order in which the plurality of TPC fields and the cells in the cell set are mapped may be mapped in the order in which the cells in the corresponding cell set are set. For example, if a specific set of cells is set to {Cell A, Cell B, Cell C, ...}, then TPC#1, TPC#2, TPC#3, ... will be Cell A, Cell B, Cell C, ... can be mapped respectively. Specifically, the following operation may be followed.

[Table 27]

In addition, when transmission for SRS is triggered based on the DCI format, the order of the triggered SRS transmission may follow the order of cells in a cell set set to an upper level indicated by DCI. Specifically, the following operation may be followed.

[Table 28]

Meanwhile, the base station may change a specific cell to a dormant cell (activating the dormant bandwidth part of the specific cell) by using a higher layer signal or an L1 signal to the terminal. Accordingly, when SRS transmission for a cell set composed of one or a plurality of cells is triggered using a specific DCI format, a cell corresponding to a dormant cell may exist in the corresponding cell set. In this case, a method of triggering SRS transmission or a method of interpreting a DCI format triggering SRS transmission may be different. Hereinafter, when a specific cell in a cell set configured in the UE for SRS transmission corresponds to a dormant cell, a method for indicating SRS transmission and specific methods for interpreting a field in a DCI format will be described. For example, an operation corresponding to at least one of the following methods or a combination of one or more methods may be considered.

[Method 1]

If the base station triggers SRS transmission for a specific cell set and a dormant cell exists in the indicated cell set, the UE may not perform SRS transmission for the dormant cell.

In this case, the order in which the plurality of TPC fields and the cells in the cell set are mapped may be mapped in the order set for the remaining cells except for the dormant cell among the cells in the corresponding cell set. If a specific cell set is set to {Cell A, Cell B, Cell C}, and Cell B is a dormant cell, TPC#1, TPC#2, TPC#3 It may be mapped to cell A and cell C, respectively. Accordingly, the UE may ignore the TPC#3 field or assume a default value (eg, '0'). As an example, the following operation may be followed.

[Table 29]

Similarly, when transmission for SRS is triggered based on the DCI format, the order of the triggered SRS transmission may follow the order of cells other than the dormant cell among cells in the cell set set to the higher level indicated by DCI. As an example, the following operation may be followed.

[Table 30]

[Method 2]

If the base station triggers SRS transmission for a specific cell set and a dormant cell exists in the indicated cell set, the UE may not perform SRS transmission for the dormant cell.

In this case, the order in which the plurality of TPC fields and cells in the cell set are mapped may be mapped in a set order including dormant cells among cells in the corresponding cell set. If a specific set of cells is set to {cell A, cell B, cell C}, and cell B is a dormant cell, then TPC#1, TPC#2, and TPC#3 are still dormant cells within the cell set, cell B. may be mapped to cell A, cell B, and cell C, respectively. At this time, if the terminal receives a DCI triggering SRS transmission for the cell set including the dormant cell from the base station, the terminal does not perform the SRS transmission for the dormant cell, and the TPC content indicated for the dormant cell is ignored. can Alternatively, if the terminal receives a DCI triggering SRS transmission for the cell set including the dormant cell from the base station, the terminal does not perform the SRS transmission for the dormant cell, and the TPC content indicated for the dormant cell is not ignored. can still be applied. For example, if the terminal's SRS transmission power control is set to the accumulation type, the terminal may assume that the TPC content for the dormant cell is still valid and accumulate and apply the TPC content for the next SRS transmission.

Based on the DCI format, when transmission for SRS is triggered, the order of the triggered SRS transmission may follow the order of cells other than the dormant cell among cells in the cell set set to the higher level indicated by DCI. As an example, the following operation may be followed.

[Table 31]

[Method 3]

The base station may not trigger SRS transmission to the terminal for a specific cell set including a dormant cell. The UE may not expect to trigger SRS transmission for a specific cell set including a dormant cell. In the example of FIG. 11 , when cell #2 is a dormant cell, SRS transmission for cell set #1 and cell set #3 including cell #2 may not be triggered. If the UE receives a DCI format triggering SRS transmission for a specific cell set including a dormant cell, the UE may regard the DCI format as an error and ignore it.

The above-described embodiment 1-1 may be implemented when the SRS is set to the type A 1100.

<Embodiment 1-2>

According to an embodiment of the present disclosure, the base station may instruct the terminal to make an SRS request for one or a plurality of cells through L1 signaling.

11 is a diagram illustrating an example of a downlink control information (DCI) structure indicating SRS transmission according to an embodiment of the present disclosure. That is, FIG. 11 is a diagram illustrating an example of an SRS transmission method using a specific DCI format (eg, DCI format 2_3). The field of the DCI format may be configured differently according to SRS configuration information.

If SRS is configured as type B 1110, one or a plurality of field blocks in the DCI format may be configured for the UE, and each field block includes one SRS request field 1111 triggering SRS transmission and SRS It may consist of one TPC field 1112 for transmission power control.

Each field block may be applied to each cell. The base station may configure one cell set consisting of one or a plurality of cells to the terminal, and each field block may be mapped one-to-one to cells in the cell set configured in the terminal, respectively. In this case, the order in which the plurality of blocks and cells in the cell set are mapped may be mapped in the order in which the cells in the corresponding cell set are set. As an example with reference to FIG. 11 , the terminal may receive a cell set {cell #1, cell #3, cell #2} from the base station, and block 2 1121 and block 3 1122 in DCI format. , block 4 1123 may be mapped to cell #1, cell #2, and cell #3, respectively.

The SRS request field 1111 present in each field block may request transmission of a specific SRS resource in a cell mapped to each field. Control contents according to the value of the SRS request field may follow, for example, [Table 32] below.

[Table 32]

The TPC field 1112 present in each field block may control transmission power for a specific SRS resource in a cell mapped to each field.

In addition, when transmission for SRS is triggered based on the DCI format, the order of the triggered SRS transmission may follow the order of cells in a cell set set to an upper level indicated by DCI. As an example, the following operation may be followed.

[Table 33]

Meanwhile, the base station may change a specific cell to a dormant cell (activating the dormant bandwidth part of the specific cell) by using a higher layer signal or an L1 signal to the terminal. Accordingly, when SRS transmission for a cell set composed of one or a plurality of cells is triggered using a specific DCI format, a cell corresponding to a dormant cell may exist in the corresponding cell set. In this case, a method of triggering SRS transmission or a method of interpreting a DCI format triggering SRS transmission may be different. Hereinafter, when a specific cell in a cell set configured in the UE for SRS transmission corresponds to a dormant cell, a method for indicating SRS transmission and specific methods for interpreting a field in a DCI format will be proposed. For example, an operation corresponding to at least one of the following methods or a combination of one or more methods may be considered.

[Method 1]

If the base station triggers SRS transmission for a specific cell set and a dormant cell exists in the indicated cell set, the UE may not perform SRS transmission for the dormant cell.

In this case, the order in which the plurality of blocks and cells in the DCI format are mapped may be mapped in the order set for the remaining cells except for the dormant cell among the cells in the corresponding cell set. If a specific cell set is set to {cell A, cell B, cell C} and cell B is a dormant cell, block #1 and block #2 are cell A except cell B, which is a dormant cell, Each may be mapped to cell C. Accordingly, the UE may ignore the block #3 field or assume a default value (eg, '0').

[Table 34]

Similarly, when transmission for SRS is triggered based on the DCI format, the order of the triggered SRS transmission is indicated by DCI and may follow the order of the remaining cells except for the dormant cell among cells that need to transmit the triggered SRS. Specifically, the following operation may be followed.

[Table 35]

[Method 2]

If the base station triggers SRS transmission for a specific cell set and a dormant cell exists in the indicated cell set, the UE may not perform SRS transmission for the dormant cell.

In this case, the order in which the plurality of blocks and cells are mapped may be mapped in a set order including dormant cells among cells in the corresponding cell set. If a particular set of cells is set to {cell A, cell B, cell C}, and cell B is a dormant cell, then block #1, block #2, and block #3 are still cells B, which are dormant cells within the cell set. may be mapped to cell A, cell B, and cell C, respectively.

For the SRS request field in the block mapped to the dormant cell, the base station may not trigger SRS transmission for the dormant cell (for example, the SRS request field indicates '00') and the terminal transmits the SRS for the dormant cell You may not expect this to be triggered.

With respect to the TPC field in the block mapped to the dormant cell, the UE may ignore the indicated TPC content. Alternatively, the base station may still indicate to the terminal a valid value in the TPC field in the block mapped to the dormant cell, and the terminal may apply the received TPC content to the dormant cell as it is. For example, if the terminal's SRS transmission power control is set to the accumulation type, the terminal may assume that the TPC content for the dormant cell is still valid and accumulate and apply it during the next SRS transmission.

Based on the DCI format, when SRS transmission is triggered, the order of the triggered SRS transmission may follow the order of cells other than the dormant cell among cells that need to transmit the triggered SRS indicated by DCI. Specifically, the following operation may be followed.

[Table 36]

The aforementioned first and second embodiments may be implemented when the SRS is set to the type B 1110 .

12 is a block diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 12 , the terminal may include a transceiver 1201 , a memory 1202 , and a processor 1203 . However, the components of the terminal are not limited to the above-described examples. For example, the terminal may include more or fewer components than the aforementioned components. In addition, at least some or all of the transceiver 1201 , the memory 1202 , and the processor 1203 may be implemented in the form of a single chip.

In an embodiment, the transceiver 1201 may transmit/receive a signal to/from the base station. The above-described signal may include control information and data. To this end, the transceiver 1201 may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting the frequency. Also, the transceiver 1201 may receive a signal through a wireless channel and output it to the processor 803 , and transmit the signal output from the processor 1203 through a wireless channel.

In an embodiment, the memory 1202 may store programs and data necessary for the operation of the terminal. Also, the memory 1202 may store control information or data included in a signal transmitted and received by the terminal. The memory 1202 may be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Also, the memory 1202 may be composed of a plurality of memories. According to an embodiment, the memory 1202 may store a program for executing an operation for power saving of the terminal.

In an embodiment, the processor 1203 may control a series of processes in which the terminal may operate according to the above-described embodiments of the present disclosure. In one embodiment, the processor 1203 receives information such as setting for CA, bandwidth part setting, SRS setting, PDCCH setting, etc. from the base station by executing the program stored in the memory 1202, and sleeps based on the setting information. It is possible to control the cell operation operation.

13 is a block diagram illustrating a structure of a base station according to an embodiment of the present disclosure.

Referring to FIG. 13 , the base station may include a transceiver 1301 , a memory 1302 , and a processor 1303 . However, the components of the base station are not limited to the above-described example. For example, the terminal may include more or fewer components than the aforementioned components. In addition, the transceiver 1301 , the memory 1302 , and the processor 1303 may be implemented in the form of a single chip.

In an embodiment, the transceiver 1301 may transmit/receive a signal to/from the terminal. The above-described signal may include control information and data. To this end, the transceiver 1301 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts a received signal. In addition, the transceiver 1301 may receive a signal through a wireless channel and output it to the processor 1303 , and transmit the signal output from the processor 1303 through a wireless channel.

In an embodiment, the memory 1302 may store programs and data necessary for the operation of the terminal. In addition, the memory 1302 may store control information or data included in a signal transmitted and received by the terminal. The memory 1302 may be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Also, the memory 1302 may be composed of a plurality of memories. According to an embodiment, the memory 1302 may store a program for executing an operation for power saving of the terminal.

In one embodiment, the processor 1303 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. In an embodiment, the processor 1303 executes the program stored in the memory 1302 to transmit information such as setting for CA, bandwidth part setting, SRS setting, PDCCH setting, etc. to the terminal, and based on the setting information, the terminal can control the dormant cell operation of

Methods according to the embodiments described in the claims or specifications of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium or computer program product storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium or computer program product are configured for execution by one or more processors in an electronic device. The one or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.

Such programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or any other form of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, a plurality of each configuration memory may be included.

In addition, the program accesses through a communication network composed of a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, elements included in the present disclosure are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is appropriately selected for the context presented for convenience of description, and the present disclosure is not limited to the singular or plural element, and even if the element is expressed in plural, it is composed of the singular or singular. Even an expressed component may be composed of a plurality of components.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are only presented as specific examples to easily explain the technical content of the present disclosure and help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it will be apparent to those of ordinary skill in the art to which the present disclosure pertains that other modified examples can be implemented based on the technical spirit of the present disclosure. In addition, each of the above embodiments may be operated in combination with each other as needed. For example, the base station and the terminal may be operated by combining parts of one embodiment and another embodiment of the present disclosure with each other. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other modifications based on the technical spirit of the embodiments may also be implemented. For example, embodiments may also be applied to LTE systems, 5G or NR systems, and the like.

Claims (1)

A method performed by a terminal in a wireless communication system, comprising:
Receiving downlink control information through a downlink control channel from the first cell;
determining whether a human indicator field exists in the downlink control information based on the downlink control information; and
and transmitting a Sounding Reference Signal (SRS) to the first cell as a result of determining that the human indicator field does not exist.

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