KR20210036782A - Method and apparatus for cross-slot scheduling for wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication technique which converges a 5G communication system for supporting higher data rates after a 4G system with a IoT technology, and a system thereof. The present disclosure may be applied to intelligent services (e.g. a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. In a wireless communication system, a control signal processing method includes the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

Description

Cross-slot scheduling method and apparatus in wireless communication system {METHOD AND APPARATUS FOR CROSS-SLOT SCHEDULING FOR WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a method and apparatus for cross-slot scheduling in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, the 60 giga (80 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, 5G communication systems include beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO). ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in 5G communication system, evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed. In addition, in 5G systems, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans create and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, etc., is also emerging. In order to implement IoT, technological elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

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

As described above and with the development of a wireless communication system, a variety of services can be provided, and thus, a method for smoothly providing these services is required.

The disclosed embodiment is to provide an apparatus and method capable of effectively providing a service in a mobile communication system.

The present invention for solving the above problems is a method for processing a control signal of a first terminal in a wireless communication system, the method comprising: receiving a first control signal transmitted from a second terminal; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the second terminal.

The disclosed embodiment provides an apparatus and method capable of effectively providing a service in a mobile communication system.

1 is a diagram showing a basic structure of a time-frequency domain in 5G.
2 is a diagram illustrating a frame, subframe, and slot structure in 5G.
3 is a diagram illustrating an example of setting a bandwidth portion in 5G.
4 is a diagram illustrating an example of setting a control region of a downlink control channel in 5G.
5 is a diagram illustrating a structure of a downlink control channel in 5G.
6 is a diagram illustrating an example of a DRX operation in 5G.
7 is a diagram illustrating an example of a cross-slot scheduling method according to an embodiment of the present disclosure.
8 is a diagram illustrating an example of a cross-slot scheduling method according to an embodiment of the present disclosure.
9 is a diagram illustrating an example of a terminal operation according to an embodiment of the present disclosure.
10 is a diagram illustrating an example of a terminal operation according to another embodiment of the present disclosure.
11 is a diagram illustrating an example of a terminal operation according to another embodiment of the present disclosure.
12 is a diagram illustrating an example of a terminal operation according to another embodiment of the present disclosure.
12A is a diagram illustrating an example of a terminal operation according to another embodiment of the present disclosure.
13 is a block diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.
14 is a block diagram illustrating a 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 contents 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 by omitting unnecessary description.

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. 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 components in each drawing.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only the present embodiments make the disclosure of the present disclosure complete, and common knowledge in the technical field to which the present disclosure pertains. It is provided to completely inform the scope of the disclosure to those who have, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification. In addition, in describing the present disclosure, when it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a 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) refers to a radio transmission path of a signal transmitted from a base station to a terminal, and an uplink (UL) refers to a radio transmission path of a signal transmitted from the terminal to the base station. In addition, the LTE or LTE-A system may be described below as an example, but the embodiment 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, and the following 5G 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 without significantly departing from the scope of the present disclosure as a judgment of a person having skilled technical knowledge.

At this time, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible for the instructions stored in the flow chart to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Since computer program instructions can also be mounted on a computer or other programmable data processing equipment, a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

In this case, the term'~ unit' used in this embodiment refers to software or hardware components such as field programmable gate array (FPGA) or application specific integrated circuit (ASIC), and'~ unit' performs certain roles. do. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. Components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further separated into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card. In addition, in an embodiment, the'~ unit' may include one or more processors.

The wireless communication system deviated from the initial voice-oriented service, for example, 3GPP 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. It is evolving into a communication system.

As a representative example of the broadband wireless communication system, the LTE system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in a downlink (DL), and a single carrier frequency division multiplexing (SC-FDMA) scheme in an uplink (UL). Access) method is adopted. Uplink refers to a radio link through which a terminal (UE (User Equipment) or MS (Mobile Station)) transmits data or control signals to a base station (eNode B or base station (BS)), and downlink refers to a base station It means a wireless link that transmits data or control signals. In the multiple access method as described above, it is possible to distinguish data or control information of each user by assigning and operating time-frequency resources to carry data or control information for each user so that they do not overlap with each other, that is, orthogonality is established. I can.

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

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

At the same time, mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC is required to support access to a large-scale terminal within a cell, improve terminal coverage, improved battery time, and reduce terminal cost. IoT is attached to various sensors and various devices to provide communication functions, so it must be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell. In addition, because the terminal supporting mMTC is highly likely to be located in a shaded area not covered by the cell, such as the basement of a building due to the nature of the service, it may require wider coverage compared to other services provided by the 5G communication system. A terminal supporting mMTC must be configured as 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 mission-critical purpose. For example, remote control of robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, emergency situations. Services used for emergency alerts, etc. can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time have a requirement of a packet error rate of ^{10 -5 or less.} Therefore, for a service supporting URLLC, a 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is a design that allocates a wide resource in the frequency band to secure the reliability of the communication link. Requirements 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 in order 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 showing a basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

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

2 is a diagram illustrating a slot structure considered in a 5G 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 1로 정의될 수 있다.2 illustrates an example of a structure of a frame 200, a subframe 201, and a slot 202. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus, one frame 200 may consist 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 be composed of one or a plurality of slots 202, 203, and the number of slots 202, 203 per subframe 201 is a set value μ (204, 205) for the subcarrier interval. ) May vary. In the example of FIG. 2, a case of μ=0 (204) and a case of μ=1 (205) as subcarrier spacing setting values are illustrated. When μ=0 (204), 1 subframe 201 may consist of 1 slot 202, and when μ=1 (205), 1 subframe 201 is 2 slots 203 It can be composed of. That is, the number of slots per subframe (

) May vary, and the number of slots per frame (

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

And

May be defined in Table 1 below.

0 14 10 One One 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32

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

3 is a diagram illustrating an example of setting a bandwidth portion in a 5G communication system.

3 shows an example in which the UE bandwidth 300 is set to two bandwidth portions, that is, a bandwidth portion #1 (BWP#1) 301 and a bandwidth portion #2 (BWP#2) 302. Show. The base station may set one or a plurality of bandwidth portions to the terminal, and may set the following information for each bandwidth portion.

Of course, it is not limited to the above example, and various parameters related to the bandwidth portion may be set in the terminal in addition to the configuration information. The information may be transmitted from the base station to the terminal through higher layer signaling, for example, Radio Resource Control (RRC) signaling. At least one bandwidth portion among the set one or a plurality of bandwidth portions may be activated. Whether or not to activate the configured bandwidth portion 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 some embodiments, the terminal before the radio resource control (RRC) connection may receive an initial bandwidth portion (Initial BWP) for initial access from the base station through a master information block (MIB). More specifically, the UE may transmit the PDCCH for receiving 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 step. It is possible to receive setting information for a control area (Control Resource Set, CORESET) and a search space. The control region and the search space set as the MIB may be regarded as identifiers (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 control region #0 through the MIB. In addition, the base station may notify the terminal of the setting information for the monitoring period and occasion for the control region #0, that is, the setting information for the search space #0 through the MIB. The terminal may consider the frequency domain set to control area #0 acquired from the MIB as an initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be regarded as 0.

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

According to some embodiments, when the bandwidth supported by the terminal is smaller than the system bandwidth, it may be supported through the setting of the bandwidth portion. For example, the base station sets the frequency position (configuration information 2) of the bandwidth portion to the terminal, so that the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

In addition, according to some embodiments, for the purpose of supporting different neurology, the base station may set a plurality of bandwidth portions to the terminal. For example, in order to support both transmission and reception of data using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz to a terminal, two bandwidth portions may be set to a subcarrier spacing of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be frequency division multiplexed, and when data is to be transmitted/received at a specific subcarrier interval, a bandwidth portion set at a corresponding subcarrier interval may be activated.

In addition, according to some embodiments, for the purpose of reducing power consumption of the terminal, the base station may set a bandwidth portion having a different size of bandwidth to the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits/receives data through 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 where 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 portion of a relatively small bandwidth to the terminal, for example, a bandwidth portion of 20 MHz. In a situation where there is no traffic, the UE can perform a monitoring operation in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data in the 100 MHz bandwidth portion according to the instruction of the base station.

In the method of configuring the bandwidth part, UEs before RRC connection may receive configuration information for an initial bandwidth part through a master information block (MIB) in an initial access step. More specifically, the UE is a control region for a downlink control channel through which Downlink Control Information (DCI) scheduling a System Information Block (SIB) from the MIB of the PBCH (Physical Broadcast Channel) can be transmitted. CORESET) can be set. The bandwidth of the control region set as the MIB may be regarded as an initial bandwidth portion, and through the set initial bandwidth portion, the UE may receive a Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted. In addition to receiving the SIB, the initial bandwidth portion may be used for other system information (OSI), paging, and random access.

When more than one bandwidth part is configured for the terminal, the base station may instruct the terminal to change the bandwidth part by using a bandwidth part indicator field in the DCI. As an example, if the currently active bandwidth part of the terminal in FIG. 3 is bandwidth part #1 301, the base station may instruct the terminal with bandwidth part #2 302 as a bandwidth part indicator in the DCI, and the terminal receives The bandwidth part can be changed 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 the bandwidth part change request, the PDSCH or PUSCH scheduled by the corresponding DCI is unreasonable in the changed bandwidth part. It should be able to perform reception or transmission without it. To this end, the standard stipulates a requirement for a delay time (TBWP) required when a bandwidth part is changed, and can be defined as follows, for example.

The requirement for the bandwidth part change delay time supports type 1 or type 2 according to the capability of the terminal. The terminal may report a bandwidth part delay time type that can be supported to the base station.

According to the above-described requirements for the bandwidth part change delay time, when the terminal receives the DCI including the bandwidth part change indicator in slot n, the terminal changes the change to the new bandwidth part indicated by the bandwidth part change indicator in slot n+ It can be completed at a time not later than the T _BWP , and transmission/reception for the data channel scheduled by the corresponding DCI can be performed in the changed new bandwidth part. When scheduling a data channel with a new bandwidth part, the base station may determine the time domain resource allocation for the data channel in consideration _{of the bandwidth part change delay time (T BWP) of the terminal.} That is, in a method of determining time domain resource allocation for a data channel when scheduling a data channel with a new bandwidth part, the base station may schedule the corresponding data channel after the bandwidth part change delay time. Accordingly, the terminal 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 indicating a bandwidth part change (for example, DCI format 1_1 or 0_1), the terminal starts from the third symbol of the slot in which the PDCCH including the DCI is received, the time domain resource allocation indicator field in the DCI No transmission or reception may be performed during a time period corresponding to the start point of the slot indicated by the slot offset (K0 or K2) 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 corresponding DCI is K, the terminal starts the third symbol of slot n and the previous symbol of slot n+K (i.e., slot The last symbol of n+K-1) may not perform any transmission or reception.

Next, a Synchronization Signal (SS)/PBCH block in 5G 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 is as follows.

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

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

-PBCH: Provides essential system information required for transmission and reception of the 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 the control channel, scheduling control information for a separate data channel transmitting system information, and the like.

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

The UE may detect the PSS and SSS in the initial access phase and may decode the PBCH. The MIB can be obtained from the PBCH, and a control region (Control Resource Set; CORESET) #0 (which may correspond to a control region with a control region index of 0) can be set from this. The UE may perform monitoring on the control region #0 assuming that the selected SS/PBCH block and the demodulation reference signal (DMRS) transmitted in the control region #0 are Quasi Co Location (QCL). The terminal may receive system information from the downlink control information transmitted in control region #0. The terminal may obtain configuration information related to a random access channel (RACH) required for initial access from the received system information. The UE may transmit 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 UE selects a block from among the respective SS/PBCH blocks and monitors the control region #0 associated therewith.

Next, downlink control information (DCI) in the 5G 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 provided through DCI. It is transmitted from the base station to the terminal. The UE may monitor a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH. The countermeasure DCI format may be composed of a fixed field selected between the base station and the terminal, and the non-preparation DCI format may include a configurable field.

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

For example, DCI scheduling a 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 RA-RNTI. DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI. The DCI notifying the SFI (Slot Format Indicator) may be scrambled with SFI-RNTI. DCI notifying TPC (Transmit Power Control) can be scrambled with TPC-RNTI. The DCI scheduling the UE-specific PDSCH or PUSCH may be scrambled with a Cell RNTI (C-RNTI).

DCI format 0_0 may be used as a countermeasure 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.

] bits
- Time domain resource assignment (시간 도메인 자원 할당) - X bits
- Frequency hopping flag (주파수 호핑 플래그) - 1 bit.
- Modulation and coding scheme (변조 및 코딩 스킴) - 5 bits
- New data indicator (새로운 데이터 지시자) - 1 bit
- Redundancy version (리던던시 버전) - 2 bits
- HARQ process number (HARQ 프로세스 번호) - 4 bits
- TPC command for scheduled PUSCH (스케줄링된 PUSCH를 위한 전송 전력 제어(transmit power control) 명령 - [2] bits
- UL/SUL indicator (상향링크/추가적 상향링크(supplementary UL) 지시자) - 0 or 1 bit -Identifier for DCI formats-[1] bit
-Frequency domain resource assignment -[

] bits
-Time domain resource assignment-X bits
-Frequency hopping flag-1 bit.
-Modulation and coding scheme-5 bits
-New data indicator-1 bit
-Redundancy version-2 bits
-HARQ process number-4 bits
-TPC command for scheduled PUSCH (transmit power control command for scheduled PUSCH-[2] bits
-UL/SUL indicator (uplink/supplementary UL indicator)-0 or 1 bit

DCI format 0_1 may be used as a non-preparative 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.

For resource allocation type 0(자원 할당 타입 0의 경우),

bits

For resource allocation type 1(자원 할당 타입 1의 경우),

bits
- Time domain resource assignment -1, 2, 3, or 4 bits
- VRB-to-PRB mapping (가상 자원 블록(virtual resource block)-to-물리 자원 블록(physical resource block) 매핑) - 0 or 1 bit, only for resource allocation type 1.

0 bit if only resource allocation type 0 is configured;

1 bit otherwise.
- Frequency hopping flag - 0 or 1 bit, only for resource allocation type 1.

0 bit if only resource allocation type 0 is configured;

1 bit otherwise.
- Modulation and coding scheme - 5 bits
- New data indicator - 1 bit
- Redundancy version - 2 bits
- HARQ process number - 4 bits
- 1st downlink assignment index (제1 하향링크 할당 인덱스)- 1 or 2 bits

1 bit for semi-static HARQ-ACK codebook(준-정적 HARQ-ACK 코드북의 경우);

2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook(단일 HARQ-ACK 코드북과 함께 동적 HARQ-ACK 코드북이 사용되는 경우).
- 2nd downlink assignment index (제2 하향링크 할당 인덱스) - 0 or 2 bits

2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks(2개의 HARQ-ACK 부코드북과 함께 동적 HARQ-ACK 코드북이 사용되는 경우);

0 bit otherwise.
- TPC command for scheduled PUSCH - 2 bits
- SRS resource indicator (SRS 자원 지시자) -

or

bits

bits for non-codebook based PUSCH transmission(PUSCH 전송이 코드북 기반이 아닐 경우);

bits for codebook based PUSCH transmission(PUSCH 전송이 코드북 기반일 경우).
- Precoding information and number of layers (프리코딩 정보 및 레이어의 개수)-up to 6 bits
- Antenna ports (안테나 포트)- up to 5 bits
- SRS request (SRS 요청)- 2 bits
- CSI request (채널 상태 정보 요청) - 0, 1, 2, 3, 4, 5, or 6 bits
- CBG transmission information (코드 블록 그룹(code block group) 전송 정보)- 0, 2, 4, 6, or 8 bits
- PTRS-DMRS association (위상 트래킹 기준 신호-복조 기준 신호 관계)- 0 or 2 bits.
- beta_offset indicator (베타 오프셋 지시자)- 0 or 2 bits
- DMRS sequence initialization (복조 기준 신호 시퀀스 초기화)- 0 or 1 bit
-Carrier indicator-0 or 3 bits
-UL/SUL indicator-0 or 1 bit
-Identifier for DCI formats-[1] bits
-Bandwidth part indicator-0, 1 or 2 bits
-Frequency domain resource assignment

For resource allocation type 0 (for resource allocation type 0),

bits

For resource allocation type 1 (for resource allocation type 1),

bits
-Time domain resource assignment -1, 2, 3, or 4 bits
-VRB-to-PRB mapping (virtual resource block-to-physical resource block mapping)-0 or 1 bit, only for resource allocation type 1.

0 bit if only resource allocation type 0 is configured;

1 bit otherwise.
-Frequency hopping flag-0 or 1 bit, only for resource allocation type 1.

0 bit if only resource allocation type 0 is configured;

1 bit otherwise.
-Modulation and coding scheme-5 bits
-New data indicator-1 bit
-Redundancy version-2 bits
-HARQ process number-4 bits
-1st downlink assignment index (1st downlink assignment index)-1 or 2 bits

1 bit for semi-static HARQ-ACK codebook (for semi-static HARQ-ACK codebook);

2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook (when a dynamic HARQ-ACK codebook is used together with a single HARQ-ACK codebook).
-2nd downlink assignment index (2nd downlink assignment index)-0 or 2 bits

2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks (when a dynamic HARQ-ACK codebook is used together with two HARQ-ACK sub-codebooks);

0 bit otherwise.
-TPC command for scheduled PUSCH-2 bits
-SRS resource indicator (SRS resource indicator)-

or

bits

bits for non-codebook based PUSCH transmission (when PUSCH transmission is not based on codebook);

bits for codebook based PUSCH transmission (when PUSCH transmission is based on codebook).
-Precoding information and number of layers -up to 6 bits
-Antenna ports-up to 5 bits
-SRS request-2 bits
-CSI request (Channel state information request)-0, 1, 2, 3, 4, 5, or 6 bits
-CBG transmission information (code block group transmission information)-0, 2, 4, 6, or 8 bits
-PTRS-DMRS association (phase tracking reference signal-demodulation reference signal relationship)-0 or 2 bits.
-beta_offset indicator (beta offset indicator)-0 or 2 bits
-DMRS sequence initialization-0 or 1 bit

DCI format 1_0 may be used as a countermeasure DCI for scheduling the PDSCH, and in this case, the 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.

] bits
- Time domain resource assignment - X bits
- VRB-to-PRB mapping - 1 bit.
- Modulation and coding scheme - 5 bits
- New data indicator - 1 bit
- Redundancy version - 2 bits
- HARQ process number - 4 bits
- Downlink assignment index - 2 bits
- TPC command for scheduled PUCCH - [2] bits
- PUCCH resource indicator (물리 상향링크 제어 채널(physical uplink control channel, PUCCH) 자원 지시자- 3 bits
- PDSCH-to-HARQ feedback timing indicator (PDSCH-to-HARQ 피드백 타이밍 지시자)- [3] bits-Identifier for DCI formats-[1] bit
-Frequency domain resource assignment -[

] bits
-Time domain resource assignment-X bits
-VRB-to-PRB mapping-1 bit.
-Modulation and coding scheme-5 bits
-New data indicator-1 bit
-Redundancy version-2 bits
-HARQ process number-4 bits
-Downlink assignment index-2 bits
-TPC command for scheduled PUCCH-[2] bits
-PUCCH resource indicator (physical uplink control channel (PUCCH) resource indicator-3 bits
-PDSCH-to-HARQ feedback timing indicator (PDSCH-to-HARQ feedback timing indicator)-[3] bits

DCI format 1_1 may be used as a non-preparative DCI for scheduling the PDSCH, and in this case, the 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.

For resource allocation type 0,

bits

For resource allocation type 1,

bits
- Time domain resource assignment -1, 2, 3, or 4 bits
- VRB-to-PRB mapping - 0 or 1 bit, only for resource allocation type 1.

0 bit if only resource allocation type 0 is configured;

1 bit otherwise.
- PRB bundling size indicator (물리 자원 블록 번들링 크기 지시자) - 0 or 1 bit
- Rate matching indicator (레이트 매칭 지시자) - 0, 1, or 2 bits
- ZP CSI-RS trigger (영전력 채널 상태 정보 기준 신호 트리거) - 0, 1, or 2 bits
For transport block 1(제1 전송 블록의 경우):
- Modulation and coding scheme - 5 bits
- New data indicator - 1 bit
- Redundancy version - 2 bits
For transport block 2(제2 전송 블록의 경우):
- Modulation and coding scheme - 5 bits
- New data indicator - 1 bit
- Redundancy version - 2 bits
- HARQ process number - 4 bits
- Downlink assignment index - 0 or 2 or 4 bits
- TPC command for scheduled PUCCH - 2 bits
- PUCCH resource indicator - 3 bits
- PDSCH-to-HARQ_feedback timing indicator - 3 bits
- Antenna ports - 4, 5 or 6 bits
- Transmission configuration indication (전송 설정 지시)- 0 or 3 bits
- SRS request - 2 bits
- CBG transmission information - 0, 2, 4, 6, or 8 bits
- CBG flushing out information (코드 블록 그룹 플러싱 아웃 정보) - 0 or 1 bit
- DMRS sequence initialization - 1 bit-Carrier indicator-0 or 3 bits
-Identifier for DCI formats-[1] bits
-Bandwidth part indicator-0, 1 or 2 bits
-Frequency domain resource assignment

For resource allocation type 0,

bits

For resource allocation type 1,

bits
-Time domain resource assignment -1, 2, 3, or 4 bits
-VRB-to-PRB mapping-0 or 1 bit, only for resource allocation type 1.

0 bit if only resource allocation type 0 is configured;

1 bit otherwise.
-PRB bundling size indicator (physical resource block bundling size indicator)-0 or 1 bit
-Rate matching indicator-0, 1, or 2 bits
-ZP CSI-RS trigger (zero power channel status information reference signal trigger)-0, 1, or 2 bits
For transport block 1 (for the first transport block):
-Modulation and coding scheme-5 bits
-New data indicator-1 bit
-Redundancy version-2 bits
For transport block 2 (for the second transport block):
-Modulation and coding scheme-5 bits
-New data indicator-1 bit
-Redundancy version-2 bits
-HARQ process number-4 bits
-Downlink assignment index-0 or 2 or 4 bits
-TPC command for scheduled PUCCH-2 bits
-PUCCH resource indicator-3 bits
-PDSCH-to-HARQ_feedback timing indicator-3 bits
-Antenna ports-4, 5 or 6 bits
-Transmission configuration indication-0 or 3 bits
-SRS request-2 bits
-CBG transmission information-0, 2, 4, 6, or 8 bits
-CBG flushing out information (code block group flushing out information)-0 or 1 bit
-DMRS sequence initialization-1 bit

Hereinafter, a method of allocating time domain resources for a data channel in a 5G 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 (PUSCH) to the UE. RRC signaling). For the PDSCH, a table consisting of maxNrofDL-Allocations = 16 entries can be set, and for the PUSCH, a table consisting of maxNrofUL-Allocations = 16 entries can be set. The time domain resource allocation information includes, for example, PDCCH-to-PDSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, expressed as K0) or PDCCH-to-PUSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), the PDSCH or PUSCH is scheduled within the slot Information on the location and length of the start symbol, the PDSCH or PUSCH mapping type, and the like may be included. For example, information such as the following table may be notified from the base station to the terminal.

The base station may notify the terminal of one of the entries in the table for the time domain resource allocation information to the terminal through L1 signaling (e.g., DCI) (e.g., to indicate to the'time domain resource allocation' field in the DCI. Can). The terminal may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

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

4 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system. 4 shows the UE bandwidth part 410 on the frequency axis, and two control areas (control area #1 (401), control area #2 (402)) within one slot 420 as the time axis. It shows an example that has been made. The control regions 401 and 402 may be set in a specific frequency resource 403 within the entire terminal bandwidth portion 410 on the frequency axis. The time axis may be set as one or a plurality of OFDM symbols, and this may be defined as a control region length (Control Resource Set Duration, 404). Referring to the example illustrated in FIG. 4, control area #1 401 is set to a control area length of 2 symbols, and control area #2 402 is set to a control area length of 1 symbol.

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

In Table 9, tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information is one or more SSs (Synchronization Signals) in a Quasi Co Located (QCL) relationship with the DMRS transmitted from the corresponding control region. / May include information of a physical broadcast channel (PBCH) block index or a channel state information reference signal (CSI-RS) index.

5 is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in 5G. According to FIG. 5, the basic unit of time and frequency resources constituting the control channel may be referred to as REG (Resource Element Group, 503), and REG 503 is 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis. (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.

As shown in FIG. 5, when a basic unit to which a downlink control channel is allocated in 5G is a control channel element (CCE) 504, one CCE 504 may be composed of a plurality of REGs 503. When 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 consist of 72 REs. When a downlink control region is set, the corresponding region may be composed of a plurality of CCEs 504, and a specific downlink control channel is configured with one or more CCEs 504 according to an aggregation level (AL) within the control region. It can be mapped and transmitted. The CCEs 504 in the control area are classified by numbers, and in this case, the numbers of the CCEs 504 may be assigned according to a logical mapping method.

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 the DMRS 505, which is a reference signal for decoding them, is mapped. As shown in FIG. 5, three DMRSs 505 may be transmitted within 1 REG 503. The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and the number of different CCEs indicates 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 terminal needs to detect a signal without knowing the information on the downlink control channel, and for blind decoding, a search space representing a set of CCEs has been 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 a bundle of 1, 2, 4, 8, 16 CCEs. Since there is a level, the terminal can have a plurality of search spaces. The search space set may be defined as a set of search spaces at all set aggregation levels.

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

In 5G, a parameter for a search space for a PDCCH may be set from a base station to a terminal by higher layer signaling (eg, SIB, MIB, RRC signaling). For example, the base station has the number of PDCCH candidates at each aggregation level L, a monitoring period for a search space, a monitoring occasion per symbol in a slot for a search space, a search space type (common search space or terminal-specific search space), The combination of the DCI format and RNTI to be monitored in the search space, the control region index to monitor the search space, etc. can be set to the terminal. For example, it may include the following information.

The base station may set one or a plurality of search space sets to the terminal according to the configuration information. According to some embodiments, the base station may set search space set 1 and search space set 2 to the terminal, and set to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and search DCI format B scrambled with Y-RNTI in space set 2 can be set to be monitored in a UE-specific search space.

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

In the common search space, a combination of the following DCI format and RNTI can 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, 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 following definitions and uses.

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

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

CS-RNTI (Configured Scheduling RNTI): For semi-statically configured UE-specific PDSCH scheduling

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

P-RNTI (Paging RNTI): PDSCH scheduling for paging transmission

SI-RNTI (System Information RNTI): For PDSCH scheduling through which system information is transmitted

INT-RNTI (Interruption RNTI): Used to inform whether or not the PDSCH is pucturing

TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct the power control command for PUSCH

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

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

The DCI formats specified above may follow the definition below.

The search space of the control region p in 5G and the aggregation level L in the search space set s can be expressed as the following equation.

[Equation 1]

- L: aggregation level

-n _CI : Carrier index

-N _CCE,p : Total number of CCEs in control area p

-n ^μ _s,f : slot index

-M ^(L) _p,s,max : number of PDCCH candidates at aggregation level L

-m _snCI = 0, ..., M ^(L) _p,s,max -1: PDCCH candidate index of aggregation level L

- i = 0, ..., L-1

,

,

,

,

,

-

,

,

,

,

,

-n _RNTI : terminal identifier

The value of Y_(p,n ^μ _s,f ) may correspond to 0 in the case of a common search space.

In the case of a terminal-specific search space, the Y_(p,n ^μ _s,f ) value may correspond to a value that changes according to the identity of the terminal (C-RNTI or an ID set by the base station to the terminal) and a time index.

In 5G, as a plurality of search space sets may be set with different parameters (eg, parameters in Table 10), the set of search space sets monitored by the terminal may vary at each time point. For example, if search space set #1 is set to X-slot period, search space set #2 is set to Y-slot period, and X and Y are different, the terminal searches for 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 set in the terminal, the following conditions may be considered in a method of determining a 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 candidate groups per slot in a cell set to a subcarrier interval of 15·2 ^{μ kHz, and may be defined by the following table.}

[Condition 2: Limit the maximum number of CCEs]

The number of CCEs constituting the total search space per slot (here, the total search space means the entire CCE set 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 interval of 15·2 ^{μ kHz, and may be defined in the following table.}

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

According to the settings of the search space sets of the base station, it may occur that the condition A is not satisfied at a specific time point. When condition A is not satisfied at a specific time point, the terminal may select and monitor only a part of search space sets set to satisfy condition A at that time point, and the base station may transmit the PDCCH to the selected search space set.

The following method can be followed as a method of selecting some of the search spaces from the set of all search spaces.

[Method 1]

If the condition A for the PDCCH is not satisfied at a specific point in time (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 among search space sets existing at a corresponding time point over a search space set set as a terminal-specific search space.

When all search space sets set as common search spaces are selected (i.e., when condition A is satisfied even after selecting all search spaces set as common search spaces), the terminal (or base station) is a 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 a terminal-specific search space, a search space set having a low search space set index may have a higher priority. In consideration of the priority, the terminal-specific search space sets may be selected within a range in which condition A is satisfied.

6 is a diagram for explaining Discontinuous Reception (DRX).

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

Referring to FIG. 6, the active time 605 is a time when 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. Have.

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

The inActive time 610 is a time set not to monitor the PDCCH during the DRX operation or/or a time set not to receive the PDCCH, and the remaining time excluding the active time 605 from the total time during which the DRX operation is performed is inActive time. It could be (610). If the UE does not monitor the PDCCH during the active time 605, it may enter a sleep or inActive state to reduce power consumption.

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

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

[Equation 2]

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

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

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

The terminal may be configured with a plurality of cells (Cell or CC (Component Carrier)) from the base station, and may be configured whether to schedule cross-carrier for cells configured in the terminal. If a specific cell (cell A, scheduled cell) is configured for cross-carrier scheduling, PDCCH monitoring for cell A is not performed in cell A, and other cells indicated by cross-carrier scheduling (cell B , May be performed in a scheduling cell). In this case, the scheduled cell (Cell A) and the scheduled cell (Cell B) may be set to different numerology. Here, the numerology may include a subcarrier spacing, a cyclic prefix, and the like. When the neurology of cell A and cell B is different, when the PDCCH of cell B schedules the PDSCH of cell A, the following minimum scheduling offset may be additionally considered between the PDCCH and the PDSCH.

[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 may be scheduled from the last symbol of the PDCCH received by cell B to the next PDSCH slot corresponding to the X symbol. . Where X may be defined, as X = 8 symbol when X = 4 symbols, μ _B = 60kHz when X = 4 symbols, μ _B = 30kHz when, μ _B = 15kHz can be different according to the μ _B.

■ If the subcarrier spacing of cell B (μ _B ) is larger than the subcarrier spacing of cell A (μ _A ), the PDSCH can be scheduled from the last symbol of the PDCCH received by cell B to the point after the X symbol. 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, embodiments of the present disclosure will be described in detail together with the accompanying drawings. Hereinafter, an embodiment of the present disclosure will be described using a 5G system as an example, but the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, LTE or LTE-A mobile communication and mobile communication technology developed after 5G may be included therein. Accordingly, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person skilled in the art.

In addition, in describing the present disclosure, when 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, terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

In the following description of the present disclosure, 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, ...)

- Radio Resource Control (RRC)

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

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 using signaling.

- PDCCH (Physical Downlink Control Channel)

- DCI (Downlink Control Information)

- UE-specific DCI

- Group common DCI

- Common DCI

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

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

- PUCCH (Physical Uplink Control Channel)

- UCI (Uplink Control Information)

In the following description of the present disclosure, the following functions are defined and used.

- min(A,B): A function that prints the smaller value of A or B

- max(A,B): A function that outputs the larger value among A and B

- ceil(X): A function that outputs the smallest integer among integers greater than X.

- floor(X): A function that outputs the largest integer among integers smaller than X.

Hereinafter, a method of allocating time domain resources for a data channel in a next-generation mobile communication system (5G or NR system) according to various embodiments of the present disclosure will be described with reference to the accompanying drawings.

The base station may set a table for time domain resource allocation information for PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel) to the UE as higher layer signaling (e.g., SIB, RRC signaling). For the PDSCH, a table consisting of maxNrofDL-Allocations = 16 entries can be set, and for the PUSCH, a table consisting of maxNrofUL-Allocations = 16 entries can be set. The time domain resource allocation information includes, for example, PDCCH-to-PDSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH (Physical Downlink Control CHannel) is transmitted, K0) or PDCCH-to-PUSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, expressed as K2), within the slot Information on the location and length of the start symbol in which the PDSCH or PUSCH is scheduled, the mapping type of the PDSCH or PUSCH, and the like may be included. For example, information such as the following table may be notified from the base station to the terminal (see [Table 7] and [Table 8] described above).

According to an embodiment of the present disclosure, the base station may notify the terminal of one of the entries in the table for time domain resource allocation information to the terminal through L1 signaling (eg, DCI) (for example,'time in DCI. It can be indicated by the'domain resource allocation' field). The terminal may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

If an entry with a K0/K2 value of 0 is indicated, this may mean that the PDCCH and the data channel are scheduled in the same slot. This is called "Self-slot scheduling".

If an entry having a value of K0/K2 greater than 0 is indicated, this may mean that the PDCCH and the data channel are scheduled in different slots. This is called "Cross-slot scheduling".

In a next-generation mobile communication system (5G or NR system), cross-slot scheduling may be used for the purpose of reducing power consumption of a terminal. When cross-slot scheduling is supported, the terminal may operate in a sleep mode between a time when a PDCCH is received and a time when transmission and reception of a data channel occurs, thereby reducing power consumption. In addition, when the terminal supports cross-slot scheduling, the terminal can take a long processing time for the PDCCH, and accordingly, the power consumption can be reduced by increasing the computation speed. In addition, time domain scheduling information for the PDSCH may be finally obtained when decoding is completed after receiving the PDCCH. Therefore, during the time period in which the PDCCH is received and decoded, since the UE cannot know whether to schedule the PDSCH, it may be necessary to perform buffering of OFDM symbols in which the PDSCH can be scheduled, which consumes power of the UE. Can be greatly increased. If the terminal can know the time domain resource allocation information for the PDSCH before decoding the PDCCH, that is, it can know in advance that cross-slot scheduling is performed, and the terminal can minimize unnecessary PDSCH buffering, thereby consuming power. Can be reduced.

In order to reduce the power consumption of the terminal, the base station may indicate to the terminal the minimum value of K0/K2 to be used in scheduling for the data channel through higher layer signaling or L1 signaling. The terminal can expect that scheduling is always performed with a K0/K2 value corresponding to a value greater than or equal to the minimum value of K0/K2 received from the base station. For convenience of explanation, the minimum value for K0/K2 indicated by the base station to the terminal is referred to as "minimum offset".

The terminal is a DCI (e.g., DCI format 1_1 or DCI format 0_1) scheduling a PDSCH or PUSCH from the base station or a non-scheduled DCI (e.g., a new DCI format defined for power reduction purposes or defined for power reduction purposes). A minimum offset value may be indicated through a new RNTI or DCI format 2_0 or DCI format 2_1. The terminal receives the minimum offset value for K0 (K0 _min ) and the minimum offset value for K2 (K2 _min ) separately from the base station as different values, or the minimum offset values for K0 and K2 (K _min ). Can receive one value.

In some embodiments of the present disclosure, the terminal may _{separately receive a minimum offset value for K0 (K0 min} ) and a minimum offset value for K2 (K2 _min ) from the base station as different values. That is, the terminal may receive each set of candidate values for _{K0 min} and K2 _{min. The terminal may be indicated K0 min} in the DL DCI format (eg, DCI format 1_1), and may be indicated _{K2 min} in the UL DCI format (eg, DCI format 0_1). The terminal may assume different application delay time #0 and application delay time #2 for the _{received application delay times for K0 min} and K2 _{min, respectively.} In this case, the UE can relax the PDCCH processing time only within the application delay time #0, and cannot relax the PDCCH processing time within the application delay time #2. Alternatively, the terminal may _{assume one application delay time for the received application delay times for K0 min} and K2 _min , and in this case, the application delay time may be determined as a function _{of K0 min.}

In some embodiments of the present disclosure, the terminal may receive one _{value as the minimum offset value (K min) for K0 and K2 from the base station.} The terminal may be configured with a set of candidate values for _{K min} to be commonly applied to K0 and K2. The terminal may receive an indication of Kmin in a DL DCI format (eg, DCI format 1_1) or/and a UL DCI format (eg, DCI format 0_1).

In some embodiments of the present disclosure, the terminal may be configured to receive the minimum offset values for K0 and K2 from the base station separately or as a single value through higher layer signaling.

Hereinafter, in the present disclosure, _{it is assumed that one minimum offset value K min} is indicated, but the contents of the disclosure may be equally applied even when _{K0 min} and K2 _{min are indicated separately.}

According to an embodiment of the present disclosure, based on the minimum offset received from the base station, the terminal may perform scheduling only with entries in which the K0/K2 value is greater than or equal to the indicated minimum offset among preset time domain resource allocation table values. Can be expected. For example, it is assumed that the base station sets the time domain resource allocation table for the following PDSCH in the terminal.

If the base station is indicated to the terminal as a minimum offset value of 3, the terminal can expect to not be scheduled with entries whose K0 value is less than 3, that is, entry indexes 1, 2, 3, 4, 5, 6, and this Excluding the remaining entries, i.e., entry indexes 7, 8, ..., 16 can be expected to be scheduled. For convenience of description, the following terms will be defined.

-Valid entry : An entry whose K0/K2 value is greater than or equal to the received minimum offset among preset time domain resource allocation table values and can be used for scheduling.

-Invalid entry : An entry whose K0/K2 value is greater than or equal to the received minimum offset among preset time domain resource allocation table values and cannot be used for scheduling.

According to an embodiment of the present disclosure, the terminal is a candidate value for N minimum offset values through higher layer signaling from the base station, for example, K _min (0), K _min (1), ..., K _min ( N-1) can be set, and one of N minimum offset values set through L1 signaling can be indicated. For example, two minimum offset values may be set as K _min (0) = 2, K _min (1) = 4, and through a 1-bit indicator of L1 signaling (eg DCI, DCI format 0_1/1_1, etc.) One of K _-min (0) or K _min (1) may be indicated to the terminal. As another example, one minimum offset value K _min (1) = 4 may be set, and in this case, K _min (0) = 0 or K _min (0) does not consider any restrictions on the time domain resource allocation table. It may be considered an operation that does not (ie, assumes all entries in the preset time domain resource allocation table as valid entries), and in this case, the base station signals L1 to the terminal (e.g., DCI, DCI format 0_1/1_1, etc.) _{One of K -min} (0) or K _min (1) may be indicated to the terminal through the 1-bit indicator of.

According to an embodiment of the present disclosure, the terminal may receive the minimum offset value through DCI transmitted from the base station at a specific point in time, and the received minimum offset value is applied from the point at which the minimum offset value is received from a point after a specific point in time. can do. For example, the terminal may receive a minimum offset value from the DCI received through the PDCCH transmitted at the time _{T 0} from the base station, and the minimum offset newly acquired from the time (T _{app ) after a certain time (T delay) has elapsed.} The content of the value can be applied. At this time, T _app can be expressed as a function of T ₀ and T _delay. If the terminal receives the DCI indicating the minimum offset value at time _{T 0} from the base station, the terminal may not expect to apply the _{indicated minimum offset value before T app.} Here, the meaning of applying the minimum offset value may correspond to an operation of determining and applying the entries of the time domain resource allocation table set for higher layer signaling as valid or invalid entries based on the minimum offset value received by the terminal.

7 is a diagram illustrating an example of a cross-slot scheduling method according to an embodiment of the present disclosure. As described above, the base station may indicate the minimum offset value, K _min, to the terminal as DCI through the PDCCH 704 transmitted at a specific time point (700). _{The UE may receive an indication of K min} through the PDCCH 704 _{at time T-0} (corresponding to slot n 710 in the example of FIG. 7) from the base station. The terminal receives the value of _{K min} received from the base station and the time after a _{certain time (T delay ) from T 0} (corresponding to slot n (710) in the example of FIG. 7) _{when K min is received (T app} ) Can be applied from. In the example of FIG. 7, the terminal _{applies K min} received in slot n 710 in slot n+k (k=3) 713. The time interval between the time when K _min is received and the time when the received K _min is applied should be named as "Application Delay (720)" and marked as _{T delay.}

During the time indicated by the above-described application delay time or minimum offset or during a specific time period, the terminal may operate in a "power reduction mode". Here, that the terminal operates in the power reduction mode may mean that it operates in at least one or a combination of one or more of the following.

- Operation to reduce power consumption by increasing the processing time for the PDCCH

- Operation to reduce power consumption by not performing buffering on OFDM symbols

- Operation to reduce power consumption by operating in sleep mode

That is, there is an advantage in that power consumption of the terminal can be reduced by considering the above-described application delay time.

The application delay time described above can be determined, for example, as a function of the following parameters.

- PDCCH subcarrier spacing (μ0)

- PDSCH subcarrier spacing (μ1)

- PUSCH subcarrier spacing (μ2)

-PDCCH processing time (T _proc1 )

-Relaxed PDCCH processing time (corresponding to a longer time than the PDCCH processing time) (T _proc2 )

- PDCCH-related configuration information (e.g., PDCCH start or end symbol position, control region (CORESET)-related configuration information (control region symbol length, control region frequency allocation information, precoding-related configuration information, etc.), search space ) Related configuration information (slot-unit monitoring period and offset, symbol-unit monitoring occasion, number of PDCCH candidates, etc.)

-Minimum applied delay time (T _delay,min )

-Maximum applied delay time (T _delay,max )

- Whether to set up cross-carrier scheduling

-Minimum value of scheduling offset for PDSCH (K0 _min,2 )

-Minimum value of scheduling offset for PUSCH (K2 _min,2 )

-The minimum offset value assumed by the terminal before the newly indicated minimum offset value (i.e., the minimum offset value assumed by the terminal _{at the time of receiving the minimum offset value (T 0 )) (K0 min,pre} , K2 _{min, pre} , K _min,pre )

In the following, various embodiments of a method for determining the application delay time described above will be described.

In describing the present disclosure, the following parameters are defined and used.

-T ₀ : When DCI including minimum offset value is received

-T _delay : Application delay time

-T _app : The point at which the received minimum offset value is applied

According to an embodiment of the present disclosure, the application delay time (T _delay ) in slot n is a subcarrier interval (μ0) of a PDCCH, a subcarrier interval (μ1) of a PDSCH, or a subcarrier interval (μ2) of a PUSCH, a minimum applied delay time ( T _delay,min ), it may be expressed as a function of _{the minimum offset value (K min,pre} ) assumed by the terminal in slot n.

According to an embodiment of the present disclosure, a time point T ₀ at which a DCI indicating a minimum offset is received and an application delay time T _delay may be defined in units of slots. For example, if the terminal can be applied to, T _app = T ₀ (= slot n) + T new instructions a minimum offset value from _delay If obtain an indication of the minimum offset in T ₀ (= slot n).

According to an embodiment of the present disclosure, in consideration of a situation in which the subcarrier spacing of the control channel and the data channel may be different, the application delay time T _delay is Scaling in consideration of the subcarrier spacing of the PDCCH, PDSCH, or PUSCH. Can be applied. More specifically, if the terminal receives a DCI including an indicator for the minimum offset in slot n based on the PDCCH subcarrier interval (μ0), and the subcarrier interval of the PDSCH or PUSCH scheduled by the corresponding DCI is μ1 or μ2 , By re-converting the slot index, it is possible to determine the time point to apply the minimum offset after _{the application delay time (T delay).} In order to re-convert the slot index, a scaling factor, S, may be considered. For example, when a PDCCH including an indicator for a minimum offset is received in slot n, a newly indicated minimum offset value from _{g ((slot n + T delay) * S) may be applied.} Here, g() may correspond to an arbitrary function. For example, S may correspond to a scaling factor based on the subcarrier spacing of the data channel, and may be defined as, for example, S=2 ^(μ1-μ0) (or S=2 ^(μ2-μ0) ). As another example, S may correspond to a scaling factor based on the minimum (or maximum) of the subcarrier intervals of the PDCCH and the data channel, for example S = 2 ^(μref-μ0) , μref = min (μ0, μ1) (Or μref = min(μ0, μ2)) or S=2 ^(μref-μ0) , μref = max(μ0, μ1) (or μref = max(μ0, μ2)).

According to an embodiment of the present disclosure, _{in determining the application delay time (T delay ), the minimum offset value (K min,pre} ) assumed by the terminal before the newly indicated minimum offset value may be considered. For example, T _delay can be expressed as a function of T _min,pre. This may have an advantage in terms of reducing the power consumption of the terminal. In more detail, for example, if the terminal _{assumes that T min,pre} =X, the terminal can operate a longer processing time for the PDCCH based on the X value for the purpose of reducing power consumption. For example, the UE may perform decoding on the PDCCH by extending the processing time for the PDCCH by X. In this case, a decoding completion time point for the DCI indicating a new minimum offset value may be after X, and thus, the UE may acquire a new minimum offset value after X time. Accordingly, the application delay time T _delay may be at least equal to or greater than X. Therefore, defining the application delay time (T _delay ) in _{consideration of T min,pre} may have an advantage in increasing the power consumption reduction effect of the terminal.

According to one embodiment of the present disclosure, there is applied at least delay (T _{delay, min)} can be considered in determining the applied delay time (T _delay). T _delay,min may correspond to the minimum value of the application delay time that the terminal can assume, and may be defined as a value of _{T delay,min ≥0.} If T _delay = T _delay,min = 0, this may mean that the minimum offset value received by the terminal is applied in the slot in which the corresponding minimum offset value is received. The _{value of T delay,min may be} set by the base station through higher layer signaling to the terminal or may be defined as a fixed value.

In consideration of the above-described parameters, the application delay time (T _delay ) and the time point at which the newly indicated minimum offset is applied (T _app ) may be determined according to the following equation. In the following equation, each parameter may follow the contents of the above-described embodiment.

[Equation 3]

T _app = ceil(T ₀ + T _delay ) * S where T _delay = max(K _min,pre , T _delay,min )

The application delay time described by Equation 3 is only an example, and may be expressed by various equations.

According to an embodiment of the present disclosure, if there is a PDCCH monitoring occasion set to be monitored by the base station during a time period corresponding to the application delay time, the UE may monitor the PDCCH according to the configuration, and transmit within the application delay time. _{An indicator for K min} may be additionally received through the DCI. _{Referring to FIG. 7 as an example, the UE may receive K min,1} through DCI transmitted in the PDCCH monitoring occasion 704 of slot n 710 (operation 700). _{The UE can apply K min,1} in a slot (slot n+3 (713) in FIG. 7) after the application delay time 720 _{for K min} received at the PDCCH monitoring occasion 704 (operation 701) ). The UE can monitor the PDCCH monitoring occasion 705 in another slot n+1 (711) within the application delay time corresponding to (720), and K through the DCI transmitted at the PDCCH monitoring occasion of (705) _{It is possible} to additionally receive min,2 (act 702). _{The UE may apply K min,2} in a slot (slot n+4 714 in FIG. 7) after the application delay time 721 _{for K min} received at the PDCCH monitoring occasion 703 (operation 703). As a result, the UE can assume that K _{min, 2} to a minimum offset value in the slot n + 3 (713) in the can assume K _{min, 1} to the minimum offset, slot n + 4 (714). That is, depending on the case, the minimum offset value may vary for each slot.

_{As described above, before applying the K min} value ( _{represented as K min,1} ) received by the UE through the first transmitted PDCCH, a new K _min value (represented as _{K min,2) with the PDCCH transmitted thereafter.} In the case of receiving and applying it, there may be a disadvantage that the effect of reducing the power consumption of the terminal may be reduced. Referring to FIG. 7 as an example, the terminal may _{assume K min,1} in slot n+3 and K _min,2 in slot n+4. The terminal adjusts the processing operation speed for the PDCCH according to the assumption of the minimum offset value in each slot, and the larger the minimum offset value in the corresponding slot, the larger the processing operation speed for the PDCCH can be extended, thereby reducing power consumption. You can see the effect. _{If K min,1} =4, K _min,2 =2 in the above example, the UE applies the processing time assuming _{K min,1} =4 for PDCCH processing in slot n+3, while slot n It is necessary to change from +4 to K _min,2 =2, and accordingly, when processing for the PDCCH of slot n+3 goes beyond slot n+4, it cannot be assumed that the _{existing K min,1 =4} Therefore, the effect of reducing power consumption may be reduced.

Meanwhile, the current 5G does not allow out-of-order scheduling as follows in the scheduling method for the data channel.

- For any two HARQ process IDs in a given scheduled cell, if the UE is scheduled to start receiving a first PDSCH starting in symbol j by a PDCCH ending in symbol i, the UE is not expected to be scheduled to receive a PDSCH starting earlier than the end of the first PDSCH with a PDCCH that ends later than symbol i.

- For any two HARQ process IDs in a given scheduled cell, if the UE is scheduled to start a first PUSCH transmission starting in symbol j by a PDCCH ending in symbol i, the UE is not expected to be scheduled to transmit a PUSCH starting earlier than the end of the first PUSCH by a PDCCH that ends later than symbol i.

Based on the above 5G standard content, out-of-order scheduling can be defined as follows.

[Out-of-order scheduling]

- For PDSCHs having any two HARQ process IDs, the last symbol of the terminal receiving the scheduling of the first PDSCH with the start symbol j through the PDCCH with the last symbol i is the last symbol of the first PDSCH through the PDCCH that is not later than i When a faster PDSCH is scheduled

- For PUSCHs having any two HARQ process IDs, the first PUSCH with the start symbol j is scheduled through the PDCCH with the last symbol i through the PDCCH with the last symbol not later than i

_{As described above, before applying the K min} value ( _{represented as K min,1} ) received by the UE through the first transmitted PDCCH, a new K _min value (represented as _{K min,2) with the PDCCH transmitted thereafter.} When receiving and applying it, if K _min,2 is _{less than K min,1} , out-of-order scheduling may occur, which may affect the data transmission/reception operation of the terminal.

Accordingly, in order to solve the above-described problems, a limit on the minimum offset value that the terminal can assume for each slot may be required, or a limit on the time point at which the minimum offset value can be updated may be required. In the following, various embodiments for solving the above-described problem will be described in detail.

<First Example>

According to some embodiments of the present disclosure, the UE may not expect that a new minimum offset value is indicated from the PDCCH transmitted during a time period corresponding to the application delay time. When described in detail with reference to FIG. 7, the terminal may receive 700 a _{new minimum offset value K min,1 in slot n 710, and apply the received K min, 1} at a time after the application delay time 720 Applicable in in-slot n+3 (713). At this time, the terminal receives the K _min, existing between the applied delay 720 for ₁ PDCCH monitoring occasion (Fig. 7 In the example of 705, 706), K _{min, 1} and the other values from the DCI is transmitted on the It may not be expected that another minimum offset value (K _min ) value is indicated. If the UE receives a new minimum offset value from the PDCCH transmitted during the time period corresponding to the application delay time, it may perform an operation corresponding to one or a combination of one or more of the following operations.

- Method 1: The terminal may regard the received DCI as an error and ignore the entire contents of the received DCI.

-Method 2: The terminal _{ignores only the K min} value of the received DCI, determines that the contents of the remaining DCI are valid, and can operate according to the instructions of the DCI.

In the operation according to the above-described first embodiment of the present disclosure, a problem may arise when understanding of a time interval in which a new minimum offset value cannot be indicated is different between the base station and the terminal.

Specifically, referring to FIG. 8, in FIG. 8, the UE can receive K _min (0) = 2, K _min (1) = 4 from the base station (800), and the UE assumes in slot 0 (810) The minimum offset value may be K _pre = 2 (820). In the example of FIG. 8, the terminal may assume that T _delay = K _{pre = 2 for K min transmitted on the PDCCH in slot 0 (810).} In the example of FIG. 8, the base station _{instructs K min, 1} = 4 (830) as the DCI in slot 0 (810), but an example in which the terminal misses the corresponding DCI is illustrated. _{The base station may transmit the same minimum offset value, K min,1} =K _min,2 =4 in slot 0 810 and slot 1 811 existing within the application delay time 840. On the other hand, when the terminal misses the DCI transmitted in slot 0 (810) and receives the DCI transmitted in slot 1 (811), the terminal applies delay time based on slot 1 (811), T _delay = K _pre = 2 _{(841) can be assumed, and accordingly, for the minimum offset value K min, 3} (832) transmitted in slot 2 812 existing within the application delay time 841, the minimum transmitted in slot 1 811 It can be expected to be equal to the offset value K _{min,2 (831). However, the base station may transmit the same K min} value in slot 0 810 and slot 1 811, and in slot 2 812 may transmit a different K _min value, that is, K _min,3 =2 (832). . _{Accordingly, the terminal determines K min,3} (832) transmitted in slot 2 (812) as an incorrect value, treats it as an error, and ignores it.

As described above, there should be a common understanding between the base station and the terminal when a new minimum offset value can be indicated (or cannot be indicated).

<Example 1-1>

According to some embodiments of the present disclosure, the terminal may receive a time point at which a new minimum offset value can be indicated (or a time point at which the application delay time is applied) from the base station through higher layer signaling. As an example, the base station transmits information on a set of slot indexes (or indexes for possible time resource units such as symbol or frame or system frame or PDCCH monitoring occasion index) in which a new minimum offset value can be indicated to the UE, and transmits a higher layer signal. It can be set through. The aforementioned slot index is referred to as "minimum offset valid slot".

For example, the terminal may receive the following configuration from the base station.

Slot index 0 One 2 3 4 5 6 7 8 9 Whether minimum offset indication is possible O X O X O X O X O X

In the above table, O may correspond to a slot in which a new minimum offset value may be indicated, and X may correspond to a slot in which a new minimum offset value may not be indicated. That is, in the above example, the terminal can expect to receive a new minimum offset value through the DCI transmitted in the {0, 2, 4, 6, 8} slot index, and {1, 3, 5, 7, 9} slots In the index, it can be expected to receive the same minimum offset value as the value indicated in the {0, 2, 4, 6, 8} slot index (if there is an indicated value).

As another example, the terminal sets information on the minimum offset effective slot index from the base station to candidate values of the minimum offset, for example, K _min (0), K _min (1), ..., K _min (N-1 ), can be set for each. For example, when the terminal is set to K _min (0) = 2, K _min (1) = 4, the minimum offset valid slot may be set as follows.

Slot index 0 One 2 3 4 5 6 7 8 9 K _min (0)=2 O X O X O X O X O X K _min (1)=4 O X X X O X X X O X

When a plurality of minimum offset valid slot index sets are set as in the example above, when the currently assumed minimum offset value is K _pre = K _min (X), _{the minimum offset set for K min} (X) is valid. A slot index can be assumed. For example, if K _pre =2, the terminal may assume {0, 2, 4, 6, 8} as the minimum offset valid slot corresponding to _{K min (0) = 2, and if K pre} =4 , The terminal may assume {0, 4, 8} as the minimum offset valid slot corresponding to _{K min (1) = 4.}

More specifically, information on the minimum offset effective slot may be set in the following manner, for example.

-Method 1 : It can be set by bitmap and period. For example, a pattern for a minimum offset valid slot within P slots may be set as a P-bit bitmap, and the corresponding bitmap pattern may be repeated in a P slot period. P can also be set. One set of valid minimum offset slots may be set, or a total of N sets may be set by setting each of the set minimum offset values.

-Method 2 : The bitmap is set and the period can be implicitly determined. For example, the period may be implicitly determined by set minimum offset candidate values or application delay time. For example, the candidate values of the minimum offset in which the period P is set, K _min (0), K _min (1), ..., K _min (N-1) (or the application delay that can be determined by each minimum offset candidate value) Time values), it may be determined as M (≥1) times the minimum value (or maximum value). Or, a total of N periods, P(0), P(1), ..., P(N-1) candidate values of the minimum offset set, K _min (0), K _min (1), ... , K _min (N-1) (or application delay time values that can be determined as respective minimum offset candidate values), may be determined to be M (≥ 1) times for each. For one or more determined Ps, a pattern for a minimum offset valid slot within P slots may be set as a P-bit bitmap, and the corresponding bitmap pattern may be repeated in a P-slot period. One set of valid minimum offset slots may be set, or a total of N sets may be set by setting each of the set minimum offset values.

-Method 3: It can be set by offset (or initial starting point) and period. For example, an offset in units of slots (or the same starting point of the period) and period may be set.

-Method 4: Offset (or initial starting point) is set and the period can be implicitly determined. For example, an offset in units of slots (or the same starting point of a period) may be set, and the period may be implicitly determined by other system parameters. For example, the candidate values of the minimum offset in which the period P is set, K _min (0), K _min (1), ..., K _min (N-1) (or the application delay that can be determined by each minimum offset candidate value) Time values), it may be determined as M (≥1) times the minimum value (or maximum value). Or, a total of N periods, P(0), P(1), ..., P(N-1) candidate values of the minimum offset set, K _min (0), K _min (1), ... , K _min (N-1) (or application delay time values that can be determined as respective minimum offset candidate values), may be determined to be M (≥ 1) times for each. The offset may be set or set for one value, or for one or a plurality of periods P determined implicitly, so that a total of N values may be set.

In the first embodiment of the present disclosure, the slot index may be replaced with an index having a different time unit, such as a symbol index, a frame index, or a system frame index, and applied in the same manner.

In the first embodiment of the present disclosure, the slot index may be replaced with an index related to PDCCH monitoring, for example, a PDCCH monitoring occasion index, and the same may be applied. For example, the PDCCH monitoring occasion index may correspond to an index of a PDCCH monitoring occasion determined as a search space set in which DCI indicating a minimum offset value is transmitted.

9 is a diagram illustrating an operation of a terminal according to an embodiment 1-1 of the present disclosure. In step 900, the terminal may receive configuration information for the minimum offset valid slot. In step 901, the terminal may _{determine whether the slot in which K min} is transmitted corresponds to the minimum offset valid slot. If it is determined in step 901 that the corresponding slot corresponds to the minimum offset valid slot, the terminal can expect the received K _min value to be indicated as a new value that is the same as or different from the previous slot. If it is determined in step 901 that the corresponding slot does not correspond to the minimum offset valid slot, the terminal can _{expect the received K min} value to be indicated by the same value as the previous slot, and not to be indicated by a different value. I can.

By limiting the time point at which a new minimum offset value can be transmitted through the above-described embodiment 1-1, the minimum offset value of the terminal is prevented from frequently changing, thereby solving various possible problems described above, and through this The power consumption of the terminal can be greatly reduced.

<Example 1-1-1>

According to some embodiments of the present disclosure, the terminal may receive a time point at which a new minimum offset value can be updated through higher layer signaling from the base station in advance. As an example, the base station transmits information on a set of slot indexes (or indexes for possible time resource units such as symbol or frame or system frame or PDCCH monitoring occasion index) in which a new minimum offset value can be indicated to the UE, and transmits a higher layer signal. It can be set through. The above-described slot index is referred to as "minimum offset applicable slot".

A specific embodiment and setting method may be applied in the same manner by substituting "minimum offset valid slot" with "minimum offset applicable slot" in the above-described embodiment 1-1. If the slot at the point in time to which the received K _min value is to be applied is a slot that is set to "minimum offset applicable slot", the _{terminal can update the minimum offset value to the received K min} value, and if the received K _min value is If the slot at the time to be applied is not the slot set as “minimum offset applicable slot”, the previous minimum offset value (or the currently assumed minimum offset value) without updating to _{the K min value received at the minimum offset value} Can be maintained as it is, or it can be assumed to be a predefined default value. The default value may be regarded as, for example, K _min = 0 or an operation that does not consider any restrictions on the time domain resource allocation table (ie, assumes all entries in the preset time domain resource allocation table as valid entries).

10 is a diagram illustrating a terminal operation according to an embodiment 1-1-1 of the present disclosure. In step 1000, the terminal may receive configuration information for a slot applicable to the minimum offset. _{The terminal may determine whether the slot to which the K min} received in step 1001 is to be applied corresponds to the minimum offset applicable slot. If it is determined in step 1001 that the corresponding slot corresponds to the minimum offset applicable slot, the terminal may update the minimum offset value with the _{received K min value.} If it is determined in step 1001 that the corresponding slot does not correspond to the minimum offset applicable slot, the terminal _{does not update the minimum offset value with the received K min} value, and maintains or selects the previously assumed minimum offset value. It can be assumed to be a defined default value.

By limiting the time point at which a new minimum offset value can be applied through the above-described embodiment 1-1-1, the minimum offset value of the terminal is prevented from being frequently changed, thereby solving various possible problems described above, and Through this, power consumption of the terminal can be greatly reduced.

<Example 1-1-2>

The above-described embodiment 1-1 and the embodiment 1-1-1 may be combined and applied. That is, the terminal can receive both the "minimum offset valid slot" and the "minimum offset applicable slot" from the base station through higher layer signaling, and accordingly, the above-described method can be applied to each slot in the same manner.

<Example 1-2>

According to some embodiments of the present disclosure, by adjusting a monitoring occasion of a search space set set to monitor a DCI format indicating a minimum offset value, a time point at which the minimum offset value can be transmitted is limited (e.g., application delay time In order to prevent a new minimum offset value from being transmitted within), it is possible to limit the frequent change of the minimum offset value accordingly.

According to some embodiments of the present disclosure, the terminal monitors a set of search spaces configured to monitor a DCI format including a field for a minimum offset value in which a monitoring period is set to a value less than T or a period less than T. You can't expect it.

According to some embodiments of the present disclosure, the terminal may expect that a monitoring period is set to a value greater than T or monitored by a T period for a set of search spaces configured to monitor a DCI format including a field for a minimum offset value. have.

According to some embodiments of the present disclosure, the terminal may expect that the monitoring period is set to T or monitored at a period greater than T for a search space set configured to monitor a DCI format including a field for a minimum offset value. .

In this case, T may be determined in the following manner.

-Method 1: T can be predefined as part of the system parameter.

-Method 2: T may correspond to a value reported to the base station through capability signaling of the terminal.

-Method 3: T can be set by the base station through higher layer signaling to the terminal.

-Method 4: T may be determined by other system parameters set by the base station to the terminal. For example, T is the smallest value among candidate values of the minimum offset set by the base station to the terminal, for example, K _min (0), K _min (1), ..., K _min (N-1) (or The largest value).

-Method 5: T may be determined by other system parameters set by the base station to the terminal. For example, T may correspond to the largest value (or the smallest value) among application delay times that the terminal can assume.

-Method 6: T may be determined by a system parameter indicated by the base station to the terminal. For example, T may correspond to the minimum offset value (or application delay time) currently assumed by the terminal. That is, the monitoring period or monitoring occasion of the search space set set to monitor the DCI format indicating the minimum offset value may be changed by the currently assumed (or indicated) minimum offset value (or application delay time).

By limiting the time point at which a new minimum offset value can be applied through the above-described embodiment 1-2, the minimum offset value of the terminal is prevented from being frequently changed, thereby solving various possible problems described above, and through this, the terminal Power consumption can be greatly reduced.

<Example 1-2-1>

According to some embodiments of the present disclosure, the terminal may receive one or more set of search spaces configured to monitor a DCI format indicating a minimum offset value. As an example, the terminal may set search space set #X for _{K min} (X), candidate values of the minimum offset in which the period P is set, for example. When the currently assumed minimum offset value is K _min (X), the terminal may monitor the search space set #X. The terminal may receive a DCI format indicating the minimum offset value from the search space set #X.

11 is a diagram illustrating a terminal operation according to an embodiment 1-2-1 of the present disclosure. In step 1100, the terminal may receive configuration information for the candidate values of the minimum offset, K _min (0), K _min (1), ..., K _min (N-1). In step 1101, the terminal may receive configuration information for search space sets, search space sets #0, ..., and search space set #N-1 for candidate values of each minimum offset. In step 1102, the terminal may _{determine whether the currently assumed minimum offset value is K min} (X). If it is determined in step 1102 that the currently assumed minimum offset value is K _min (X), the terminal may perform monitoring on the search space set #X corresponding to the minimum offset value in step 1103, and the search space set You can receive the _{K min} value from #X. If the minimum offset value currently assumed in step 1102 does not correspond to any of the set minimum offset values, the terminal sets the default search space in step 1104 (here, the default search space set is irrespective of the currently assumed minimum offset value). It may correspond to a set of search spaces additionally configured to monitor DCI including the K _{min indicator) can be monitored.}

<Second Example>

According to some embodiments of the present disclosure, the UE may allow a new minimum offset value to be indicated from the PDCCH transmitted during a time period corresponding to the application delay time. When described in detail with reference to FIG. 7, the terminal may receive 700 a _{new minimum offset value K min,1 in slot n 710, and apply the received K min, 1} at a time after the application delay time 720 Applicable in in-slot n+3 (713). At this time, the terminal receives the K _min, existing between the applied delay 720 for ₁ PDCCH monitoring occasion (Fig. 7 days of example 703, 704), K _{min, 1} and the other values from the DCI is transmitted on the It is possible to allow other minimum offset values (K _min,2 ) to be indicated.

That is, according to the second embodiment, when the terminal receives a new minimum offset value from the PDCCH transmitted during a time period corresponding to the application delay time, the new minimum offset value is not ignored and the existing minimum offset (K _{min, 1} ) and It is possible to apply the minimum offset by determining which of the new minimum offset values (K _{min, 2) to be applied.}

According to the second embodiment of the present disclosure, the terminal may update the minimum offset value to _{the K min value indicated from the most recently received DCI.}

According to the second embodiment of the present disclosure, the terminal may apply _{different application delay times to the application delay time for the K min} value indicated from the DCI received within the application delay time according to the time point at which the DCI is received. . More specifically, the application delay time that the terminal basically assumes for the minimum offset _{is expressed as T delay,0} (e.g., the application delay time that can be expressed by a function such as Equation 3 or a function similar thereto). May correspond to). The terminal may assume an _{application delay time T delay,0} based on a specific time point among the time points for monitoring the DCI format indicating the minimum offset. The first slot that the UE assumes the application delay time T _delay,0 is named "slot A". For example, in FIG. 7, slot n 710 may correspond to slot A. _{The UE may apply K min} indicated in the DCI format transmitted in slot A from a time point after T _{delay,0. For example, K min} indicated in slot n 710 in slot n+3 713 in FIG. 7 may be applied. The terminal may receive the DCI format from the PDCCH that exists during the time period corresponding to _{T delay,0} after slot n (710), and may receive an indication of _{K min from this.} For example, in FIG. 7, a DCI format indicating a _{minimum offset value K min} from the PDCCH for PDCCH monitoring occasions 705 and 706 existing within the application delay time 720 may be additionally received. After slot A, the UE may apply an application delay time T _delay,1 (k) _{different from T delay,0} for the application delay time for _{the K min} value indicated in the DCI format transmitted within the application delay time after slot A. . T _delay,1 (k) _{may be expressed as a function of T delay, 0} and a slot index (or a slot position or an offset from slot A, etc.) indicated by _{K min} within the application time. As an example, the UE may assume an application delay time shorter than T _{delay,0 for the K min} value indicated within the application delay time after slot A. As a specific example, if slot n corresponds to slot A described above, and the slot in which the terminal _{receives K min} within the application delay time is slot n+k, T _delay,1 (k) = max(T _{delay, 0-} It can be defined as k, T _{delay, min ).} Here, T _delay,min may be defined as the minimum possible value as the application delay time. That is, in the example of FIG. 7, when slot n (710) corresponds to slot A and T _{delay, 0} = 3, the applied delay time T _{delay,1 for K min} received in slot n+1 (711) (1) = 3-1=2 can be applied, and the application delay time T _delay,1 (2) = 3-2 =1 can be applied for _{K min received in slot n+2 (712).} . When the application delay time adjustment according to the above-described embodiment is applied, the terminal can guarantee the same application times for _{one or more K min values received within the application delay time. In the example of FIG. 7, the UE may apply all K min} values received in slot n (710), slot n+1 (711), and slot n+2 (712) in slot n+3 (713). Through this embodiment, a problem in which the minimum offset value assumed by the terminal is frequently changed can be solved.

According to the second embodiment of the present disclosure, if the terminal has received a plurality of minimum offset values, such as K _min (0), K _min (1), ..., K _min (N-1), the received minimum offset When all the values are to be applied in the same slot X, the terminal may update the minimum offset value to _{a K min value indicated from the most recently received DCI format among the received minimum offset values.}

<Third Example>

In some embodiments of the present disclosure, the terminal may not perform monitoring on the PDCCH during a time period corresponding to the application delay time for the purpose of maximally reducing the amount of power consumption according to the PDCCH monitoring. That is, during the time period corresponding to the application delay time, if there is a PDCCH monitoring occasion set to be monitored by the base station, the UE may not perform monitoring for the corresponding PDCCH monitoring occasion. _{Referring to FIG. 7 as an example, the UE may receive K min,1} through DCI transmitted in the PDCCH monitoring occasion 704 of slot n 710 (operation 700). _{The UE can apply K min,1} in a slot (slot n+3 (713) in FIG. 7) after the application delay time 720 _{for K min} received at the PDCCH monitoring occasion 704 (operation 701) ). The UE for PDCCH monitoring occasions 705 and 706 that exist in other slots (slot n+1 (711), slot n+2 (712)) within the application delay time corresponding to (720). Monitoring may not be performed. The UE may re-monitor the PDCCH monitoring occasion 707 of the slot (slot n+3 (713)) that exists after the application delay time 720.

As described above, the UE may not perform PDCCH monitoring for a specific time period (in the above example, the application delay time). In the following, for the sake of brevity in describing the present disclosure, all operations that do not perform PDCCH monitoring are referred to as “PDCCH Skip operation”. It should be named "1 hour section". For example, the application delay time described above may correspond to the first time period.

Considering the aforementioned operation of omitting the PDCCH in the first time period of the terminal, if the terminal performs the operation of omitting the PDCCH in a state in which the understanding of the first time period is different between the base station and the terminal, correct transmission and reception between the base station and the terminal This can be impossible. For example, in FIG. 8, the base station may assume the first time period as slot 1 811, and the terminal may assume the first time period as slot 2 812. In this case, the base station may transmit the PDCCH to the terminal at the PDCCH monitoring occasion 803 of slot 2 812, while the terminal may not monitor the PDCCH monitoring occasion 803. Therefore, it may be important to ensure the same understanding of the first time period between the base station and the terminal.

According to an embodiment of the present disclosure, the first time period may be composed of the following information.

[Parameters related to the first time section]

- Initial time point to assume the first time interval (e.g. start slot)

- Length of the first time section

- Repetition cycle of the first time section

According to an embodiment of the present disclosure, the terminal is the first time period (or the time when the terminal first applies (or assumes) the application delay time, or the time when the terminal applies (or assumes) the application delay time, or the PDCCH is omitted. A time period in which the operation can be applied, or a time period in which the PDCCH skip operation is considered and the operation is possible) may be preset from the base station through higher layer signaling. In the method of setting the first time period, as an example, all or part of the "first time period related parameter" may be notified from the base station to the terminal through higher layer signaling. As another example, the setting method for the first time period may be applied in the same manner by substituting the "minimum offset valid slot" with the "PDCCH skipping operation impossible slot" in the above-described embodiment 1-1.

According to an embodiment of the present disclosure, all or part of the "first time section related parameter" may be determined by a system parameter set in the terminal or currently assumed. For example, in a method of determining the first time period, the following methods may be considered. In the following description, a search space set configured to monitor a DCI format indicating a minimum offset value by the terminal is referred to as "search space set A".

-Method 1: The terminal may determine the first time interval from the PDCCH monitoring occasion determined as the search space set A. As an example, the UE may assume that the remaining time intervals excluding the slot in which the PDCCH monitoring occasion determined as the discovery space set A exists is the first time interval. As another example, the UE starts with the next slot of a specific slot (this is referred to as “slot A”) among slots in which the PDCCH monitoring occasion determined as the discovery space set A exists, and a specific time length (this is referred to as “time interval T”). Named ". For example, a time interval corresponding to the minimum offset value currently assumed by the terminal or a time length corresponding to the application delay time) may be determined as the first time interval. Accordingly, the terminal may determine a time interval repeated every time interval T+1 starting with slot A as the total first time interval. Here, slot A may be set through higher layer signaling from the base station to the terminal, or correspond to a fixed slot (eg, first PDCCH monitoring occasions corresponding to slot 0 or search space set A).

-Method 2: The terminal transmits HARQ-ACK for the PDSCH scheduled by the DCI format indicating the minimum offset value, and then at a time corresponding to a specific time (eg, after X ms, eg, X=3). The next slot of the slot in which the PDCCH monitoring occasion corresponding to the discovery space set A existing at the nearest point of time exists (this is referred to as slot A) may be assumed as a starting point. Starting with slot A, the time interval corresponding to a specific length of time (this is called "time interval T". For example, the minimum offset value currently assumed by the terminal or the length of time corresponding to the applied delay time) is the first time It can be judged as a section. Accordingly, the terminal may determine a time interval repeated every time interval T+1 starting with slot A as the total first time interval. Here, slot A may be set through higher layer signaling from the base station to the terminal, or correspond to a fixed slot (eg, first PDCCH monitoring occasions corresponding to slot 0 or search space set A).

-Method 3: In some embodiments of the present disclosure, the remaining time intervals excluding the slot corresponding to the aforementioned "minimum offset valid slot" may correspond to the first time interval. Or the slot corresponding to the minimum offset valid slot.

-Method 4: In some embodiments of the present disclosure, the remaining time intervals excluding the slots corresponding to the aforementioned "minimum offset applicable slot" may correspond to the first time interval.

-Method 5: It may be determined by a method corresponding to a combination of all or some of the aforementioned methods.

According to an embodiment of the present disclosure, the first time period may vary according to a minimum offset value currently assumed by the terminal or an application delay time.

In some embodiments of the present disclosure, the UE may perform a "PDCCH skip operation" for PDCCH monitoring occasions corresponding to all search space sets set in the above-described first time period.

12 is a diagram illustrating a terminal operation according to the embodiment of the present disclosure. The terminal may receive the setting information for the first time period in step 1200 or may determine the first time period through various methods described above. In step 1201, the terminal may determine whether the current slot corresponds to the first time period. If it is determined in step 1201 that the corresponding slot is a slot corresponding to the first time period, the terminal may not perform monitoring on the PDCCH existing in the corresponding slot in step 1202 (i.e., a PDCCH skip operation). If it is determined in step 1201 that the corresponding slot is not a slot corresponding to the first time period, the terminal may perform monitoring on the PDCCH existing in the corresponding slot in step 1203.

In some embodiments of the present disclosure, the UE may perform a "PDCCH skip operation" for PDCCH monitoring occasions corresponding to all or part of the search space set set within the aforementioned first time period. For example, the UE may selectively perform "PDCCH skip operation" only for PDCCH monitoring occasions corresponding to the following search space set.

-PDCCH monitoring occasion determined as a set of search spaces set to monitor the DCI format including a field indicating the minimum offset (K _{min) value}

- PDCCH monitoring occasion in which the search space type is determined as a search space set set as a UE-specific search space

The search space set to which the PDCCH skip operation is applied is collectively referred to as a "first search space set".

For example, the UE may still perform monitoring for PDCCH monitoring occasions corresponding to the following search space set.

- PDCCH monitoring occasion determined as a search space set in which the search space type is set as a common search space

- PDCCH monitoring occasion determined as a set of search spaces set to monitor the DCI format indicating the slot format (for example, DCI format 2_0)

- PDCCH monitoring occasion determined as a set of search spaces set to monitor the DCI format indicating whether to pre-emption (for example, DCI format 2_1)

- PDCCH monitoring occasion determined as a set of search spaces set to monitor the DCI format (for example, DCI formats 2_2, 2_3) indicating the transmit power command

The search space set to which the PDCCH skip operation is not applied is referred to as a "second search space set".

12A is a diagram illustrating a terminal operation according to the embodiment of the present disclosure. The terminal may receive the setting information for the first time period in step 1204 or determine the first time period through various methods described above. In step 1205, the terminal may determine whether the current slot corresponds to the first time interval. If it is determined in step 1205 that the corresponding slot is a slot corresponding to the first time period, the terminal determines whether the PDCCH monitoring occasion existing in the corresponding slot corresponds to the "first search space set" in step 1206. can do. If it is determined in step 1206 that it corresponds to the first search space set, the terminal may not perform monitoring for the corresponding PDCCH monitoring occasion existing in the corresponding slot in step 1207. If it is determined in step 1206 that it does not correspond to the first search space set, the terminal may perform monitoring for a corresponding PDCCH monitoring occasion existing in the corresponding slot in step 1207. If it is determined in step 1205 that the corresponding slot is not a slot corresponding to the first time period, the terminal may perform monitoring on the PDCCH existing in the corresponding slot in step 1209.

In some embodiments of the present disclosure, in a method for monitoring PDCCH monitoring occasions existing in the first time period, the UE, among the PDCCH monitoring occasions existing in the first time period, "first search space PDCCH monitoring occasion corresponding to both "set" and "second search space set" (that is, when the PDCCH monitoring occasion corresponding to the first search space set and the PDCCH monitoring occasion corresponding to the second search space set overlap) For, the UE may perform monitoring for the corresponding PDCCH monitoring occasion.

In some embodiments of the present disclosure, in a method for monitoring PDCCH monitoring occasions existing in the first time period, the UE, among the PDCCH monitoring occasions existing in the first time period, "first search space PDCCH monitoring occasion corresponding to both "set" and "second search space set" (that is, when the PDCCH monitoring occasion corresponding to the first search space set and the PDCCH monitoring occasion corresponding to the second search space set overlap) For, the UE may not perform monitoring for the corresponding PDCCH monitoring occasion.

In some embodiments of the present disclosure, whether or not the UE performs the PDCCH skip operation in the first time period may be configured from the base station through higher layer signaling or may be indicated through L1 signaling.

In the above-described embodiment, the slot index may be replaced with an index having a different time unit, such as a symbol index, a frame index, or a system frame index, and applied in the same manner.

In the above-described embodiment, the slot index may be replaced with an index related to PDCCH monitoring, for example, a PDCCH monitoring occasion index, and the same may be applied. For example, the PDCCH monitoring occasion index may correspond to an index of a PDCCH monitoring occasion determined as a search space set in which DCI indicating a minimum offset value is transmitted.

<Fourth embodiment>

In some embodiments of the present disclosure, the UE may be configured with one or a plurality of cells from the base station, and set different minimum offset values for each cell (or equally, for each cell, for each bandwidth part) or You can be instructed. In this case, the UE may assume or apply the same minimum offset value for a specific cell group or cell set among the configured cells. A set of cells that assumes or applies the same minimum offset value described above is referred to as a "first cell group". The first cell group may be determined, for example, in one or a combination of one or more of the following cases.

- A set of cells existing in the same frequency range (FR) (e.g., the frequency range can be divided into FR1 and FR2) according to the carrier frequency (e.g., a frequency lower than 6 GHz or a higher frequency band), and the terminal is present in FR1. The same minimum offset value can be assumed or applied to cells, and the same minimum offset value can be assumed or applied to cells existing in FR2.)

- A set of cells existing in the same frequency layer (FL)

- A set of cells existing in the same cell group (e.g., master cell group (MCG) or secondary cell group (Secondary Cell Group)), the terminal can be divided into the same minimum offset value for cells existing in the MCG Can be assumed or applied, and the same minimum offset value can be assumed or applied to cells existing in the SCG.)

- A set of cells corresponding to intra-band CA (the terminal may assume or apply the same minimum offset value for cells corresponding to intra-band CA.)

- A set of cells configured for cross-carrier scheduling (eg, among cells #0, #1, ..., and #N-1, cell #0 may be set to self-carrier scheduling, and cells #1,. .., cell #N-1 may be configured for cross-carrier scheduling In this case, cell #0 is the same for cell #0, cell #1, ..., cell #N-1 on which scheduling is performed. Minimum offset value can be assumed or applied.)

In some embodiments of the present disclosure, in a method for assuming or applying the same minimum offset value to cells existing in the first cell group, at least one of the following methods or a combination of one or more methods may be applied. .

-Method 1: For the cell i (i = 0, 1, ..., N-1) existing in the first cell group, the terminal, K _min (i) (i = 0, 1, ..., N 1) a may be set or instructed, the terminal corresponding to the notified from a plurality of _{K min (i) (i =} 0, 1, ..., N-1) values, the minimum value (or maximum value) K _min The minimum offset can be assumed as a value.

-Method 2: The UE for the cell i (i = 0, 1, ..., N-1) existing in the first cell group, K _min (i) (i = 0, 1, ..., N -1) can be set or instructed, and at this time, the terminal _{expects that a plurality of K min} (i) (i = 0, 1, ..., N-1) values are set or indicated to different values I can't.

-Method 3: The UE can set or receive an indication of _{K min} from cell X as a reference among cells i (i = 0, 1, ..., N-1) existing in the first cell group, and The same can be applied to all cells in one cell group. Cell X may be determined, for example, as a cell having the lowest (or highest) index among cells, a PCell or a PSCell, or a cell that performs scheduling.

According to the above-described fourth embodiment, when the terminal operates in carrier aggregation, the same minimum offset value can be applied to all cells in the first cell group, and accordingly, the terminal is simultaneously applied to all cells in the first cell group. Since it can operate in this power reduction mode, the terminal power consumption can be more effectively reduced.

<Fifth Example>

In some embodiments of the present disclosure, the UE may be configured with one or a plurality of cells from the base station, and set different minimum offset values for each cell (or equally, for each cell, for each bandwidth part) or You can be instructed. In this case, the UE may assume or apply the same application delay time to a specific cell group or cell set among the configured cells. A set of cells that assume or apply the same application delay time described above is referred to as a "first cell group". The first cell group may be determined by, for example, at least one of the following cases or a combination of one or more cases.

- A set of cells existing in the same frequency range (FR) (e.g., the frequency range can be divided into FR1 and FR2) according to the carrier frequency (e.g., a frequency lower than 6 GHz or a higher frequency band), and the terminal is present in FR1. The same minimum offset value can be assumed or applied to the cells, and the same application delay time can be assumed or applied to the cells existing in FR2.)

- A set of cells existing in the same frequency layer (FL)

- A set of cells existing in the same cell group (e.g., master cell group (MCG) or secondary cell group (Secondary Cell Group)), the terminal can be divided into the same minimum offset value for cells existing in the MCG Can be assumed or applied, and the same minimum offset value can be assumed or applied to cells existing in the SCG.)

- A set of cells corresponding to intra-band CA (the terminal may assume or apply the same minimum offset value for cells corresponding to intra-band CA.)

- A set of cells configured for cross-carrier scheduling (eg, among cells #0, #1, ..., and #N-1, cell #0 may be set to self-carrier scheduling, and cells #1,. .., cell #N-1 may be configured for cross-carrier scheduling In this case, cell #0 is the same for cell #0, cell #1, ..., cell #N-1 on which scheduling is performed. Application delay time can be assumed or applied.)

In some embodiments of the present disclosure, in a method for assuming or applying the same application delay time value to cells existing in the first cell group, at least one of the following methods or a combination of one or more methods may be applied. have.

-Method 1: For the cell i (i = 0, 1, ..., N-1) existing in the first cell group, the terminal, K _min (i) (i = 0, 1, ..., N 1) a may be set or instructed, the terminal corresponding to the notified from a plurality of _{K min (i) (i =} 0, 1, ..., N-1) values, the minimum value (or maximum value) K _min The application delay time can be determined as a function of the value. For example, it may be determined by the following equation.

[Equation 4] When taking the minimum value

T _app = ceil(T ₀ + T _delay ) * S where T _delay = max(K _min,pre , T _delay,min )

K _min,pre = min(K _min,pre (0), K _min,pre (1), ..., K _min,pre (N-1))

[Equation 5] When taking the maximum value

T _app = ceil(T ₀ + T _delay ) * S where T _delay = max(K _min,pre , T _delay,min )

K _min,pre = max(K _min,pre (0), K _min,pre (1), ..., K _min,pre (N-1))

K _min,pre (i) may correspond to the minimum offset value currently assumed in cell i, and if the numerology of the PDCCH and the PDSCH are different, consider the ratio of the subcarrier spacing of the control channel and the subcarrier spacing of the data channel. , Scaling may be applied based on the neurology of the control channel. For example, K _min,pre (i) = K _min,pre (i) * S2, and may be determined as ^{S2 = 2 (μ_control-μ_data).} For example, when the first cell group corresponds to a set of cells configured for cross-carrier scheduling, the application delay time may be determined as follows.

-Method 2: The UE for the cell i (i = 0, 1, ..., N-1) existing in the first cell group, K _min (i) (i = 0, 1, ..., N -1) can be set or instructed, and at this time, the terminal _{expects that a plurality of K min} (i) (i = 0, 1, ..., N-1) values are set or indicated to different values I can't.

-Method 3: The UE may set or receive _{K min} from cell X as a reference among cells i (i = 0, 1, ..., N-1) existing in the first cell group, and this value Based on this, the same application delay time may be applied to all cells existing in the first cell group. Cell X may be determined, for example, as a cell having the lowest (or highest) index among cells, a PCell or a PSCell, or a cell that performs scheduling.

-Method 4: For the cell i (i = 0, 1, ..., N-1) existing in the first cell group, the terminal, K _min (i) (i = 0, 1, ..., N -1) can be set or indicated, and the UE is based on a plurality of notified K _min (i) (i = 0, 1, ..., N-1) values, the application delay time T _{delay of each cell} (i) (i=0, 1, ..., N-1) can be determined. The terminal may determine the application delay time as a value corresponding to the minimum value (or maximum value) among the values of _{T delay (i) (i = 0, 1, ..., N-1).}

According to the above-described fifth embodiment, when the terminal operates in carrier aggregation, the same application delay time can be applied to all cells in the first cell group. Accordingly, the terminal is simultaneously applied to all cells in the first cell group. Since it can operate in this power reduction mode, the terminal power consumption can be more effectively reduced.

<Sixth Example>

In an embodiment of the present disclosure, the terminal may be configured with a time domain resource allocation table for each configured bandwidth part. For example, if two bandwidth parts, bandwidth part #1, and bandwidth part #2 are set in the terminal, time domain resource allocation table #1 and time domain resource allocation table #2 are respectively set as configuration information for each bandwidth part. It can be set to the terminal. The terminal may use the time domain resource allocation table corresponding to the bandwidth part index indicated by the bandwidth part indicator in the DCI. For example, if the bandwidth part indicator in the DCI indicates the bandwidth part #N, the terminal assumes the time domain resource allocation table #N set as the setting information of the bandwidth part #N when interpreting the time domain resource allocation table field in the DCI. Can be interpreted.

The terminal may receive the minimum offset value from the base station through DCI transmitted in the currently active bandwidth part, and may limit the scheduling offset value in each bandwidth part based on the received minimum offset value. That is, the bandwidth part A and bandwidth part B are set in the terminal, the time domain resource allocation table A is set in the bandwidth part A, the time domain resource allocation table B is set in the bandwidth part B, and the currently active bandwidth part is the bandwidth part. In the case of A, the terminal may _{receive an indication of the minimum offset value (K min} ) from the base station through the DCI transmitted in the bandwidth part A. The terminal may determine the scheduling limitation of not only the currently activated bandwidth part A but also the deactivated bandwidth part B based on the _{K min value.} That is, the terminal may not expect that the scheduling offset in the bandwidth part A _{is scheduled to be smaller than K min} (that is, it does not expect that the scheduling offset value of the time domain table A is indicated by a value smaller than _{K min),} In bandwidth part B, the scheduling offset _{may not be expected to be scheduled to a value smaller than f(K min} ) (that is, the scheduling offset value of the time domain table B is not expected to be indicated by a value smaller than _{f(K min ).} ). In this case, f(K _min ) may correspond to an arbitrary function having _{K min as a parameter.} In the above situation, if the subcarrier spacing (or numerology) of the currently active bandwidth part A and the currently disabled bandwidth part B is different, the subcarrier spacing (μ_A) of the bandwidth part A and the subcarrier spacing of the bandwidth part B In consideration of (μ_B), f(K _min ) may be determined. As an example for determining f(K _min ), the following methods may be considered.

[Method 1]

_{When the K min} value received from the activated bandwidth part A is applied to limit the scheduling of the deactivated bandwidth part B, the K _min value based on the subcarrier spacing of the bandwidth part A may be applied to the bandwidth part B as it is. For example, f(K _min ) may be defined as follows.

f(K _min ) = K _min

[Method 2]

_{When applying the K min} value received in the activated bandwidth part A to limit the scheduling of the deactivated bandwidth part B, it may be applied after re-converting _{the K min value based on the subcarrier spacing of the bandwidth part B.} For example, f(K _min ) may be defined as follows.

f(K _min ) = floor(K _min · 2 ^μ_B / 2 ^μ_A ) or f(K _min ) = ceil(K _min · 2 ^μ_B / 2 ^μ_A )

[Method 3]

_{When applying the K min} value received in the active bandwidth part A to limit the scheduling of the inactive bandwidth part B, the K _min value can be recalculated based on the reference subcarrier spacing μ_R and then applied to the bandwidth part B. . In this case, μ_R may be defined as a smaller value among μ_A and μ_B, or may correspond to a value set in the terminal through higher layer signaling. For example, f(K _min ) may be defined as follows.

f(K _min ) = floor(K _min · 2 ^μ_R / 2 ^μ_A ) or f(K _min ) = ceil(K _min · 2 ^μ_R / 2 ^μ_A )

When the terminal receives the minimum offset value through DCI in slot n, the terminal can apply the received minimum offset value from n+X. As described above, X can be called the application delay time. In this case, in a method of determining the application delay time X, a subcarrier spacing of bandwidth part A (μ_A) and a subcarrier spacing of bandwidth part B (μ_B) may be considered as parameters. As an example, the following methods may be considered.

[Method 4]

The application delay time X may be determined based on the subcarrier spacing of the activated bandwidth part A. For example, X may be determined as follows.

X = max(floor(K _min,old · 2 ^μ0 /2 ^μ1 ), Z),

In the above equation, K _min,old is the minimum offset value currently assumed by the UE, μ0 is the subcarrier spacing of the PDCCH, μ1 is the subcarrier spacing of the PDCCH, and Z corresponds to the minimum value of the pre-defined application delay time. can do.

[Method 5]

The application delay time X may be determined in consideration of both subcarrier intervals of the activated bandwidth part A and the deactivated bandwidth part B. For example, the application delay time may be calculated based on a smaller value among a subcarrier spacing of bandwidth part A (μ_A) and a subcarrier spacing of bandwidth part B (μ_B). As an example, it may be determined as follows.

X = max(floor(K _min,old · 2 ^μ0 /2 ^μ1 ) · 2 ^μ_R / 2 ^μ_A , Z),

In the above equation, μ_R may be defined as a smaller value among μ_A and μ_B.

When the terminal receives an indicator for activating bandwidth part B, which is deactivated through DCI in slot n, the terminal can activate bandwidth part B at a time not later than _{slot n+T BWP.} Here, T _BWP may be defined as the bandwidth part change delay time (refer to the description of the bandwidth part described above and the contents of Table 2-1). The terminal may monitor the PDCCH in the currently active bandwidth part A, and may receive a DCI including scheduling information for the inactive bandwidth part B through the corresponding PDCCH. In this case, the base station may not perform scheduling at a time less than the bandwidth part change delay time when scheduling with the bandwidth part B in consideration of the delay time for activating the bandwidth part B of the terminal. The terminal may also not expect that a scheduling offset value smaller than the bandwidth part change delay time is indicated. If the terminal receives the minimum offset value from the currently active bandwidth part A, the terminal limits the scheduling in consideration of the minimum offset value, the application delay time, and the bandwidth part delay time for scheduling for the inactive bandwidth part B (scheduling offset value). You don't expect to be indicated less than this particular value).

In an embodiment of the present disclosure, the terminal may determine the scheduling restriction for the deactivated bandwidth part B by considering both the _{minimum offset value (K min} ) and the bandwidth part delay time (T _{BWP ).} For example, the terminal may not expect that a scheduling offset value is indicated to a value smaller than _max(g(Kmin ), T _BWP ) for the deactivated bandwidth part B. In this case, g(K _min ) may correspond to an arbitrary function having _{K min as a parameter.} According to an embodiment, g (K _min ) is defined based on an arbitrary method including a method of converting the minimum offset for bandwidth part B described in Method 1, Method 2, and Method 3 of the sixth embodiment described above. Can be.

In an embodiment of the present disclosure, the terminal may determine the scheduling restriction for the deactivated bandwidth part B in consideration of both the application delay time (X) and the bandwidth part delay time (T _{BWP ).} For example, the terminal may not expect that the scheduling offset value is indicated to a value smaller than max(g(X), T _{BWP) for the deactivated bandwidth part B.} In this case, g(X) may correspond to an arbitrary function using X as a parameter. In this case, X may be defined based on any method including the method for determining the application delay time described in Method 4 and Method 5 of the sixth embodiment described above.

In order to perform the above-described embodiments of the disclosure, a transceiver, a memory, and a processor of a terminal and a base station are shown in FIGS. 13 and 14, respectively. In the above-described embodiments, a method of transmitting and receiving a base station and a terminal for reducing power consumption of the terminal is shown. To do this, the transmission/reception unit, memory, and processor of the base station and the terminal must each operate according to the embodiment.

13 illustrates the structure of a terminal according to an embodiment of the present disclosure.

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

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

According to an embodiment of the present disclosure, the memory 1302 may store programs and data required for the operation of the terminal. In addition, the memory 1302 may store control information or data included in signals transmitted and received by the terminal. The memory 1302 may be formed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the memory 1302 may be formed of a plurality of memories. According to an embodiment of the present disclosure, the memory 1302 may store a program for controlling and receiving an operation for reducing power consumption of a terminal.

According to an embodiment of the present disclosure, the processor 1303 may control a series of processes in which the terminal may operate according to the above-described embodiments of the present disclosure. For example, the processor 1303 may control the power consumption reduction operation of the terminal according to embodiments of the present disclosure.

Specifically, the processor 1303 receives configuration information for the PDCCH from the base station, monitors the PDCCH from the base station based on the configuration information for the PDCCH from the base station, and detects and receives the PDCCH based on the monitoring. Each configuration of a terminal having an applied operation can be controlled.

In addition, the processor 1303 may include a plurality of processors, and by executing a program stored in the memory 1202, a method of reducing power consumption of a terminal may be performed according to embodiments of the present disclosure.

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

Referring to FIG. 14, a base station may include a transceiver 1401, a memory 1402, and a processor 1403. 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 above-described components. In addition, the transmission/reception unit 1401, the memory 1402, and the processor 1403 may be implemented in the form of a single chip.

According to an embodiment of the present disclosure, the transceiving unit 1401 may transmit and receive signals to and from the terminal. The above-described signal may include control information and data. To this end, the transmission/reception unit 1401 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. In addition, the transmission/reception unit 1401 may receive a signal through a wireless channel, output it to the processor 1403, and transmit a signal output from the processor 1403 through a wireless channel.

According to an embodiment of the present disclosure, the memory 1402 may store programs and data required for operation of the base station. In addition, the memory 1402 may store control information or data included in signals transmitted and received by the base station. The memory 1402 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the memory 1402 may be formed of a plurality of memories. According to an embodiment of the present disclosure, the memory 1402 may store a program for generating and transmitting control information for reducing power consumption of a terminal of a base station.

According to an embodiment of the present disclosure, the processor 1403 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, the processor 1403 may control each component of the base station to generate and transmit control information for reducing power consumption of the terminal.

In addition, the processor 1403 may include a plurality of processors, and by executing a program stored in the memory 1402, control information is generated and a downlink control channel for reducing power consumption of the terminal according to the embodiments of the present disclosure. How to send can be performed.

The methods according to the embodiments described in the claims or the specification 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 a computer program product are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and 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 other types 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 of them. In addition, a plurality of configuration memories may be included.

In addition, the program is accessed through a communication network such as Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination of these. It may be stored in an (access) attachable storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, the constituent elements included in the present disclosure are expressed in the singular or plural according to the presented specific embodiments. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are merely provided with specific examples to easily describe the technical content of the present disclosure and to aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, that other modified examples based on the technical idea of the present disclosure can be implemented is obvious to those of ordinary skill in the technical field to which the present disclosure belongs. In addition, each of the above embodiments can be operated in combination with each other as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined with each other to operate a base station and a terminal. In addition, the embodiments of the present disclosure can be applied to other communication systems, and other modifications based on the technical idea of the embodiment may also be implemented. For example, the embodiments may be applied to an LTE system, a 5G or NR system, and the like.

Claims (1)

In the control signal processing method in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting a second control signal generated based on the processing to the base station.

Images