Method and apparatus for cross-slot scheduling for wireless communication system

Abstract

The present disclosure relates to a communication technique and a system for integrating a 5G communication system with IoT technology to support higher data transmission rates than those of 4G systems. The present disclosure may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. Additionally, the present disclosure provides a method and apparatus for reducing terminal power consumption in a wireless communication system.

Description

Technology Field

[0001] The present disclosure relates to a cross-slot scheduling method and apparatus in a wireless communication system. Background Technology

[0002] Efforts are being made to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic since the commercialization of 4G communication systems. For this reason, 5G or pre-5G communication systems are referred to as systems beyond the 4G network or systems following the LTE system. To achieve high data transmission rates, the implementation of 5G communication systems in the mmWave band (e.g., the 60 GHz band) is being considered. To mitigate path loss and increase transmission distance in the mmWave band, technologies such as beamforming, massive MIMO, full Dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antennas are being discussed for 5G communication systems. In addition, to improve the network of the system, the development of technologies such as advanced 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 is taking place in 5G communication systems.In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) are being developed in 5G systems.

[0003] Meanwhile, the Internet is evolving from a human-centered network where humans generate and consume information into an IoT (Internet of Things) network where distributed components, such as objects, exchange and process information. IoE (Internet of Everything) technology, which combines IoT with Big Data processing technologies through connections with cloud servers, is also emerging. To implement IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required; consequently, technologies such as sensor networks, Machine-to-Machine (M2M) communication, and Machine-Type Communication (MTC) are currently being researched to facilitate the connection of objects. In an IoT environment, intelligent IT services that create new value for human life by collecting and analyzing data generated from connected objects can be provided. Through the convergence and integration of existing IT technologies with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0004] Accordingly, various attempts are being made to apply 5G communication systems (5th generation communication systems or New Radio (NR)) to IoT networks. For example, technologies such as sensor networks, Machine to Machine (M2M), and Machine Type Communication (MTC) are being implemented using 5G communication technologies such as beamforming, MIMO, and array antennas. The application of cloud radio access networks (cloud RAN) as the big data processing technology described earlier can also be considered an example of the convergence of 3eG and IoT technologies.

[0005] As a result of the aforementioned developments and advancements in wireless communication systems, it has become possible to provide various services, and thus measures are required to facilitate the smooth provision of these services. The problem to be solved

[0006] The disclosed embodiments aim to provide an apparatus and method capable of effectively providing services in a mobile communication system. means of solving the problem

[0007] The present invention, for solving the above-mentioned problems, is characterized in that a method for processing a control signal of a first terminal in a wireless communication system comprises: a step of receiving a first control signal transmitted from a second terminal; a step of processing the received first control signal; and a step of transmitting a second control signal generated based on the processing to the second terminal. Effects of the invention

[0008] The disclosed embodiments provide an apparatus and method capable of effectively providing services in a mobile communication system. Brief explanation of the drawing

[0009] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain in 5G. Figure 2 is a diagram illustrating the frame, subframe, and slot structure in 5G. Figure 3 is a diagram illustrating an example of a bandwidth portion setting in 5G. Figure 4 is a diagram illustrating an example of a control area setting for a downlink control channel in 5G. Figure 5 is a diagram illustrating the structure of a downlink control channel in 5G. Figure 6 is a diagram illustrating an example of DRX operation in 5G. FIG. 7 is a drawing illustrating an example of a cross-slot scheduling method according to an embodiment of the present disclosure. FIG. 8 is a drawing illustrating an example of a cross-slot scheduling method according to an embodiment of the present disclosure. FIG. 9 is a drawing illustrating an example of terminal operation according to an embodiment of the present disclosure. FIG. 10 is a drawing illustrating an example of terminal operation according to another embodiment of the present disclosure. FIG. 11 is a drawing illustrating an example of terminal operation according to another embodiment of the present disclosure. FIG. 12 is a drawing illustrating an example of terminal operation according to another embodiment of the present disclosure. FIG. 12a is a drawing illustrating an example of terminal operation according to another embodiment of the present disclosure. FIG. 13 is a block diagram illustrating the structure of a terminal according to an embodiment of the present disclosure. FIG. 14 is a block diagram illustrating the structure of a base station according to an embodiment of the present disclosure. Specific details for implementing the invention

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0011] In describing the embodiments, technical details that are well known in the art to which this disclosure belongs and are not directly related to this disclosure are omitted. This is intended to convey the essence of this disclosure more clearly without obscuring it by omitting unnecessary explanations.

[0012] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0013] The advantages and features of the present disclosure, and the methods for achieving them, will become clear by referring 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 various different forms. These embodiments are provided merely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration might unnecessarily obscure the essence of the present disclosure, such detailed description is omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout the specification.

[0014] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a gNode B, eNode B, Node B, BS (Base Station), wireless access unit, base station controller, or a node on a network. A terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted by a terminal to a base station. Furthermore, while LTE or LTE-A systems may be described as examples below, embodiments of this disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technologies (5G, new radio, NR) developed after LTE-A may be included therein, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0015] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0016] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0017] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0018] Wireless communication systems are evolving from providing early voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards like 3GPP’s HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2’s HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE’s 802.16e.

[0019] As a representative example of the above-mentioned broadband wireless communication system, the LTE system employs the Orthogonal Frequency Division Multiplexing (OFDM) method for the downlink (DL) and the Single Carrier Frequency Division Multiple Access (SC-FDMA) method for the uplink (UL). The uplink refers to a wireless link through which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B, or base station (BS)), and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. The above-mentioned multiple access method can distinguish the data or control information of each user by allocating and operating time-frequency resources to be sent for each user so that they do not overlap, that is, so that orthogonality is established.

[0020] As a future communication system following LTE, that is, a 5G communication system, it must be able to freely reflect the diverse requirements of users and service providers, and therefore, services that satisfy various requirements simultaneously must be supported. Services being considered for the 5G communication system include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0021] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing these peak data rates, the 5G communication system must also provide an increased user-perceived data rate. To satisfy these requirements, it necessitates improvements in various transmission and reception technologies, including enhanced Multi-Input Multi-Output (MIMO) transmission technology. Additionally, while LTE transmits signals using a maximum bandwidth of 20 MHz in the 2 GHz band, the 5G communication system can meet the data transmission speeds required by using a frequency bandwidth wider than 20 MHz in frequency bands of 3–6 GHz or above 6 GHz.

[0022] Simultaneously, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide IoT, mMTC requires support for a large number of terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT devices are attached to various sensors and equipment to provide communication functions, the system must be able to support a large number of terminals within a cell (e.g., 1,000,000 terminals / km²). Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in dead zones not covered by cells, such as building basements; therefore, they may require wider coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must consist of low-cost devices, and since it is difficult to frequently replace terminal batteries, a very long battery life of 10 to 15 years may be required.

[0023] Finally, URLLC is a mission-critical cellular-based wireless communication service. For example, consider services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts. Therefore, the communication provided by URLLC must offer very low latency and very high reliability. For instance, services supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and simultaneously 10 -5The following packet error rate requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a Transmit Time Interval (TTI) smaller than other services, and at the same time, design considerations may be required to allocate a wide resource in the frequency band to ensure the reliability of the communication link.

[0024] The three 5G services, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted within a single system. In this case, different transmission and reception techniques and parameters may be used between the services to satisfy the different requirements of each service. Of course, 5G is not limited to the three services mentioned above.

[0026] The frame structure of the 5G system will be explained in more detail below with reference to the drawings.

[0027] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a wireless resource domain where data or control channels are transmitted in a 5G system.

[0028] The horizontal axis of FIG. 1 represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of a resource is a resource element (RE, 101), which can be defined as one OFDM (Orthogonal Frequency Division Multiplexing) symbol (102) on the time axis and one subcarrier (103) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can form a single resource block (Resource Block, RB, 104).

[0029] Figure 2 is a diagram illustrating a slot structure considered in a 5G system.

[0030] FIG. 2 illustrates an example of a frame (200), subframe (201), and slot (202) structure. One frame (200) can be defined as 10ms. One subframe (201) can be defined as 1ms, and thus one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( )=14). One subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per one subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In one example of FIG. 2, cases where μ=0 (204) and μ=1 (205) are set as the subcarrier spacing value are illustrated. When μ=0 (204), one subframe (201) may be composed of one slot (202), and when μ=1 (205), one subframe (201) may be composed of two slots (203). That is, the number of slots per one subframe ( ) may vary, and accordingly, the number of slots per frame ( ) may vary. Depending on each subcarrier spacing setting μ and It can be defined by Table 1 below.

[0031] 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32

[0032] Next, the Bandwidth Part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0033] Figure 3 is a diagram illustrating an example of a configuration for a bandwidth portion in a 5G communication system.

[0034] FIG. 3 shows an example in which the terminal bandwidth (UE bandwidth) (300) is configured into two bandwidth portions, namely bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station may configure one or more bandwidth portions for the terminal and may configure the following information for each bandwidth portion.

[0035]

[0036] Of course, the above examples are not limited, and various parameters related to bandwidth portions may be configured for the terminal in addition to the above configuration information. The above information may be transmitted by the base station to the terminal via higher-layer signaling, for example, Radio Resource Control (RRC) signaling. Among the one or more configured bandwidth portions, at least one bandwidth portion may be activated. Whether a configured bandwidth portion is activated may be transmitted semi-statically from the base station to the terminal via RRC signaling or dynamically via Downlink Control Information (DCI).

[0037] According to some embodiments, prior to the Radio Resource Control (RRC) connection, the terminal may receive an Initial Bandwidth Part (Initial BWP) for initial connection from the base station via a Master Information Block (MIB). More specifically, during the initial connection phase, the terminal may receive configuration information for a Control Resource Set (CORESET) and a Search Space via the MIB, through which a PDCCH can be transmitted to receive system information required for initial connection (Remaining System Information; which may correspond to RMSI or System Information Block 1; SIB1). The Control Resource Set and Search Space configured via the MIB may each be considered as Identity (ID) 0. The base station may notify the terminal via the MIB of configuration information, such as frequency allocation information, time allocation information, and numerology, for Control Resource Set #0. Additionally, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and occasion for Control Resource Set #0, i.e., configuration information for Search Space #0. The terminal may consider the frequency region set as control region #0 obtained from the MIB as the initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be considered as 0.

[0038] The settings for the bandwidth portion supported by the above 5G can be used for various purposes.

[0039] According to some embodiments, if the bandwidth supported by the terminal is smaller than the system bandwidth, this can be supported through the bandwidth portion setting. For example, by setting the frequency position of the bandwidth portion (setting information 2) to the terminal, the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

[0040] In addition, according to some embodiments, a base station may set multiple bandwidth portions for a terminal for the purpose of supporting different numerologies. For example, to support data transmission and reception using both a 15 kHz subcarrier interval and a 30 kHz subcarrier interval for a terminal, two bandwidth portions may be set to subcarrier intervals of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be frequency division multiplexed, and when data transmission and reception is to be performed with a specific subcarrier interval, the bandwidth portion set to that subcarrier interval may be activated.

[0041] In addition, according to some embodiments, a base station may set a bandwidth portion having different bandwidth sizes for the purpose of reducing the power consumption of the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits and receives data using that bandwidth, very large power consumption may occur. In particular, in a situation where there is no traffic, performing monitoring of an unnecessary downlink control channel using a large bandwidth of 100 MHz can be very inefficient in terms of power consumption. To reduce the power consumption of the terminal, the base station may set a bandwidth portion of a relatively small bandwidth, such as 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0042] In the method for configuring the above bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the Initial Bandwidth Part through the Master Information Block (MIB) during the initial connection phase. More specifically, the terminal can receive a Control Resource Set (CORESET) for a downlink control channel through which Downlink Control Information (DCI) scheduling System Information Blocks (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control resource set by the MIB can be considered as the Initial Bandwidth Part, and through the configured Initial Bandwidth Part, the terminal can receive the Physical Downlink Shared Channel (PDSCH) through which SIBs are transmitted. In addition to receiving SIBs, the Initial Bandwidth Part may also be utilized for Other System Information (OSI), paging, and Random Access.

[0043] When one or more bandwidth parts are set for a terminal, the base station may instruct the terminal to change the bandwidth part using the Bandwidth Part Indicator field within the DCI. For example, in FIG. 3, if the currently active bandwidth part of the terminal is Bandwidth Part #1 (301), the base station may instruct the terminal to Bandwidth Part #2 (302) using the Bandwidth Part Indicator within the DCI, and the terminal may perform a bandwidth part change to Bandwidth Part #2 (302) indicated by the received Bandwidth Part Indicator within the DCI.

[0044] As mentioned above, since DCI-based bandwidth part changes can be directed by a DCI scheduling a PDSCH or PUSCH, when a terminal receives a request to change a bandwidth part, it must be able to receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI without difficulty in the changed bandwidth part. To this end, the standard specifies requirements for the delay time (TBWP) required when changing a bandwidth part, and can be defined, for example, as follows.

[0045]

[0046] The requirements for bandwidth part change delay time support Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth part delay time type to the base station.

[0047] In accordance with the aforementioned requirements for the bandwidth part change delay time, if the terminal receives a DCI containing a bandwidth part change indicator in slot n, the terminal performs a change to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T BWP Completion can be achieved at a time no later than that, and transmission and reception for the data channel scheduled by the corresponding DCI can be performed in the changed new bandwidth portion. If the base station intends to schedule a data channel in the new bandwidth portion, the terminal's bandwidth portion change delay time (T BWP By considering ), time-domain resource allocation for a data channel can be determined. That is, when a base station schedules a data channel with a new bandwidth part, in the method for determining time-domain resource allocation for a data channel, the corresponding data channel can be scheduled after the bandwidth part change delay time. Accordingly, the terminal [is notified] that the DCI instructing the bandwidth part change is the bandwidth part change delay time (T BWPYou may not expect to indicate a slot offset (K0 or K2) value smaller than )

[0048] If a terminal receives a DCI (e.g., DCI format 1_1 or 0_1) indicating a change in bandwidth part, the terminal may not perform any transmission or reception during a time interval corresponding to the time interval from the third symbol of the slot in which the PDCCH containing the said DCI was received to the beginning of the slot indicated by the slot offset value (K0 or K2) indicated by the time domain resource allocation indicator field within the said DCI. For example, if a terminal receives a DCI indicating a change in bandwidth part in slot n, and the slot offset value indicated by the said DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0050] Next, we will explain the SS (Synchronization Signal) / PBCH block in 5G.

[0051] An SS / PBCH block may refer to a physical layer channel block composed of PSS (Primary SS), SSS (Secondary SS), and PBCH. Specifically, it is as follows.

[0052] - PSS: A signal that serves as the reference for downlink time / frequency synchronization and provides some information about the cell ID.

[0053] - SSS: Serves as the reference for downlink time / frequency synchronization and provides the remaining cell ID information not provided by PSS. Additionally, it can serve as a reference signal for PBCH demodulation.

[0054] - PBCH: Provides essential system information required for transmitting and receiving data channels and control channels of the terminal. The essential system information may include search space-related control information representing wireless resource mapping information of the control channel, scheduling control information for a separate data channel that transmits system information, etc.

[0055] - SS / PBCH block: An SS / PBCH block is composed of a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks may be transmitted within a time of 5ms, and each transmitted SS / PBCH block may be distinguished by an index.

[0056] The terminal can detect PSS and SSS during the initial connection phase and can decode PBCH. It can obtain MIB from PBCH and receive a Control Resource Set (CORESET) #0 from it (which may correspond to a control resource set with a control resource index of 0). The terminal can perform monitoring of Control Resource Set #0 by assuming that the selected SS / PBCH block and the Demodulation Reference Signal (DMRS) transmitted from Control Resource Set #0 are Quasi-Co-Locations (QCL). The terminal can receive system information using downlink control information transmitted from Control Resource Set #0. The terminal can obtain configuration information related to the Random Access Channel (RACH) required for initial connection from the received system information. The terminal can transmit a Physical RACH (PRACH) to the base station considering the selected SS / PBCH index, and the base station receiving the PRACH can obtain information regarding the SS / PBCH block index selected by the terminal. The base station can know that the terminal has selected a block among the respective SS / PBCH blocks and is monitoring the associated control area #0.

[0058] Next, Downlink Control Information (DCI) in 5G systems will be explained in detail.

[0059] In a 5G system, scheduling information for uplink data (or Physical Uplink Shared Channel (PUSCH)) or downlink data (or Physical Downlink Shared Channel (PDSCH)) is transmitted from the base station to the terminal via DCI. The terminal can monitor the fallback DCI format and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may consist of fixed fields selected between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0060] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after undergoing channel coding and modulation processes. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled into a Radio Network Temporary Identifier (RNTI) corresponding to the terminal's identity. Different RNTIs may be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, or random access responses. In other words, the RNTI is not transmitted explicitly but is included in the CRC calculation process. Upon receiving a DCI message transmitted over the PDCCH, the terminal checks the CRC using the assigned RNTI; if the CRC check result is correct, the terminal knows that the message has been transmitted to it.

[0061] For example, a DCI scheduling a PDSCH for System Information (SI) can be scrambled to SI-RNTI. A DCI scheduling a PDSCH for Random Access Response (RAR) messages can be scrambled to RA-RNTI. A DCI scheduling a PDSCH for Paging messages can be scrambled to P-RNTI. A DCI notifying a Slot Format Indicator (SFI) can be scrambled to SFI-RNTI. A DCI notifying Transmit Power Control (TPC) can be scrambled to TPC-RNTI. A DCI scheduling a terminal-specific PDSCH or PUSCH can be scrambled to C-RNTI (Cell RNTI).

[0063] DCI format 0_0 can be used as a countermeasure DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI may include, for example, the following information.

[0064] - 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 - [2] bits - UL / SUL indicator - 0 or 1 bit

[0065] DCI format 0_1 ​​can be used as a non-defense DCI for scheduling PUSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI may include, for example, the following information.

[0066] - 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, bits 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; 2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook. - 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 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 (if PUSCH transmission is not codebook-based); bits for codebook-based PUSCH transmission. - Precoding information and number of layers - up to 6 bits - Antenna ports - up to 5 bits - SRS request - 2 bits - CSI request - 0, 1, 2, 3, 4, 5, or 6 bits - CBG transmission information - 0, 2, 4, 6, or 8 bits - PTRS-DMRS association - 0 or 2 bits - beta_offset indicator - 0 or 2 bits - DMRS sequence initialization - 0 or 1 bit

[0068] DCI format 1_0 can be used as a countermeasure DCI for scheduling PDSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI may include, for example, the following information.

[0069] - 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 (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

[0070] DCI format 1_1 can be used as a non-defense DCI for scheduling PDSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI may include, for example, the following information.

[0071] - 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 - 0 or 1 bit- Rate matching indicator - 0, 1, or 2 bits- ZP CSI-RS trigger - 0, 1, or 2 bits For transport block 1: - Modulation and coding scheme - 5 bits- New data indicator - 1 bit- Redundancy version - 2 bits For transport block 2: - 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 - 0 or 1 bit - DMRS sequence initialization - 1 bit

[0072] The following describes the time domain resource allocation method for data channels in a 5G communication system.

[0073] The base station may set a table for time-domain resource allocation information for the Physical Downlink Shared Channel (PDSCH) and the Physical Uplink Shared Channel (PUSCH) for the terminal using upper-layer signaling (e.g., RRC signaling). For PDSCH, a table consisting of a maximum of maxNrofDL-Allocations = 16 entries may be set, and for PUSCH, a table consisting of a maximum of maxNrofUL-Allocations = 16 entries may be set. Time domain resource allocation information may include, for example, PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0) or PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information regarding the position and length of the starting symbol for which the PDSCH or PUSCH is scheduled within the slot, and the mapping type of the PDSCH or PUSCH. For example, information such as that shown in the table below may be notified from the base station to the terminal.

[0074]

[0075]

[0076] The base station may notify the terminal of one of the entries in the table for the time domain resource allocation information via L1 signaling (e.g., DCI) (e.g., by indicating the 'time domain resource allocation' field within the DCI). The terminal may obtain time domain resource allocation information for PDSCH or PUSCH based on the DCI received from the base station.

[0078] In the following, the downlink control channel in a 5G communication system will be explained in more detail with reference to the drawings.

[0079] FIG. 4 illustrates an example of a control resource set (CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system. FIG. 4 illustrates an example in which two control resources (control resource #1 (401), control resource #2 (402)) are set within a terminal bandwidth part (UE bandwidth part) (410) on the frequency axis and one slot (420) on the time axis. The control resources (401, 402) can be set in a specific frequency resource (403) within the entire terminal bandwidth part (410) on the frequency axis. On the time axis, they can be set with one or more OFDM symbols and can be defined as the control resource set duration (Control Resource Set Duration, 404). Referring to the example illustrated in FIG. 4, control resource #1 (401) is set with a control resource length of 2 symbols, and control resource #2 (402) is set with a control resource length of 1 symbol.

[0080] The control domain in the aforementioned 5G can be configured by a base station to a terminal via upper-layer signaling (e.g., System Information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Configuring a control domain to a terminal means providing information such as a control domain identifier, the frequency location of the control domain, and the symbol length of the control domain. For example, the following information may be included.

[0081]

[0082] In Table 9, the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with the DMRS transmitted in the corresponding control area.

[0083] FIG. 5 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G. According to FIG. 5, the basic unit of time and frequency resources that constitute a control channel can be called a REG (Resource Element Group, 503), and the REG (503) can be defined as 1 OFDM symbol (501) on the time axis and 1 PRB (Physical Resource Block, 502) on the frequency axis, that is, 12 subcarriers. A base station can construct a downlink control channel allocation unit by concatenating REGs (503).

[0084] As illustrated in FIG. 5, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 504), then 1 CCE (504) can be composed of multiple REGs (503). For example, the REG (503) illustrated in FIG. 5 can be composed of 12 REs, and if 1 CCE (504) is composed of 6 REGs (503), then 1 CCE (504) can be composed of 72 REs. When a downlink control area is established, the area can be composed of multiple CCEs (504), and a specific downlink control channel can be mapped to one or multiple CCEs (504) and transmitted according to the Aggregation Level (AL) within the control area. The CCEs (504) in the control area are distinguished by numbers, and the numbers of the CCEs (504) can be assigned according to a logical mapping method.

[0085] The basic unit of the downlink control channel, namely the REG (503) shown in FIG. 5, may include both the REs to which the DCI is mapped and the DMRS (505), which is a reference signal for decoding, to which the area is mapped. As shown in FIG. 5, three DMRS (505) may be transmitted within one REG (503). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the Aggregation Level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The terminal must detect the signal without knowing information about the downlink control channel, and a search space representing a set of CCEs is defined for blind decoding. A search space is a set of downlink control channel candidates consisting of CCEs that a terminal must attempt to decode at a given aggregation level, and since there are various aggregation levels that form a group of 1, 2, 4, 8, or 16 CCEs, a terminal may have multiple search spaces. A search space set can be defined as a set of search spaces at all configured aggregation levels.

[0086] Search spaces can be classified into common search spaces and UE-specific search spaces. A certain group of terminals or all terminals may examine the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling or paging messages regarding system information. For example, PDSCH scheduling allocation information for the transmission of SIBs containing cell operator information can be received by examining the common search space of the PDCCH. In the case of the common search space, since a certain group of terminals or all terminals must receive the PDCCH, it can be defined as a pre-arranged set of CCEs. Scheduling allocation information for a UE-specific PDSCH or PUSCH can be received by examining the UE-specific search space of the PDCCH. The UE-specific search space can be defined specifically as a function of the terminal's identity and various system parameters.

[0087] In 5G, parameters for the search space for a PDCCH can be configured from the base station to the terminal via upper-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station may configure the terminal the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the occasion for monitoring in slot-symbol units for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the control domain index to be monitored in the search space. For example, the following information may be included.

[0088]

[0089] According to the configuration information, the base station may set one or multiple sets of search spaces for the terminal. According to some embodiments, the base station may set search space set 1 and search space set 2 for the terminal, and may set DCI format A scrambled with X-RNTI in search space set 1 to be monitored in a common search space, and may set DCI format B scrambled with Y-RNTI in search space set 2 to be monitored in a terminal-specific search space.

[0090] According to the configuration information, one or more sets of search spaces 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 configured as a common search space, and Search Space Set #3 and Search Space Set #4 may be configured as a terminal-specific search space.

[0091] In the common search space, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the examples below.

[0092] - 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

[0093] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0094] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0095] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0096] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0098] In terminal-specific search spaces, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the examples below.

[0099] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0100] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0102] The specified RNTIs may follow the definitions and uses below.

[0103] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH scheduling

[0104] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0105] CS-RNTI (Configured Scheduling RNTI): Used for semi-statically configured terminal-specific PDSCH scheduling.

[0106] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling during the random access phase

[0107] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0108] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0109] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is pucturing.

[0110] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0111] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0112] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power regulation commands to the SRS

[0114] The aforementioned specified DCI formats may follow the definitions below.

[0115]

[0116] In 5G, the search space of aggregation level L in the control domain p and search space set s can be expressed as the following mathematical formula.

[0117] [Mathematical Formula 1]

[0118]

[0119] - L: Lamination Level

[0120] - n CI : Carrier Index

[0121] - N CCE,p : Total number of CCEs existing within control domain p

[0122] - n μ s,f : Slot Index

[0123] - M (L) p,s,max : Number of PDCCH candidates at assembly level L

[0124] - m snCI = 0, ..., M (L) p,s,max -1: PDCCH candidate index of aggregation level L

[0125] - i = 0, ..., L-1

[0126] - , , , , ,

[0127] - n RNTI : Terminal identifier

[0128] Y_(p,n μ s,f The value of ) may correspond to 0 in the case of a common search space.

[0129] Y_(p,n μ s,f In the case of a terminal-specific search space, the value may correspond to a value that changes according to the terminal's identity (C-RNTI or ID set by the base station for the terminal) and time index.

[0131] In 5G, as multiple sets of search spaces can be configured with different parameters (e.g., the parameters in Table 10), the set of search space sets monitored by the terminal at each point in time may vary. For example, if search space set #1 is configured with an X-slot period and search space set #2 is configured with a Y-slot period and X and Y are different, the terminal may monitor both search space set #1 and search space set #2 in a specific slot, and monitor either search space set #1 or search space set #2 in a specific slot.

[0132] When multiple sets of search spaces are configured for a terminal, the following conditions may be considered in determining the set of search spaces that the terminal must monitor.

[0133] [Condition 1: Limit on the maximum number of PDCCH candidates]

[0134] The number of PDCCH candidates that can be monitored per slot is M μ Does not exceed. M μ The subcarrier interval is 15·2 μ It can be defined as the maximum number of PDCCH candidates per slot in a cell set to kHz, and can be defined by the table below.

[0135]

[0136] [Condition 2: Limit on Maximum CCEs]

[0137] The number of CCEs constituting the entire search space per slot (where the entire search space refers to the entire set of CCEs corresponding to the union area of ​​multiple search space sets) is C μ Does not exceed C μ The subcarrier interval is 15·2 μ It can be defined as the maximum number of CCEs per slot in a cell set to kHz, and can be defined by the table below.

[0138]

[0139] For the convenience of explanation, a situation in which both of the above conditions 1 and 2 are satisfied at a specific point in time is defined as "condition A". Therefore, not satisfying condition A may mean not satisfying at least one of the above conditions 1 and 2.

[0140] Depending on the configuration of the base station's search space sets, there may be cases where Condition A is not satisfied at a specific point in time. If Condition A is not satisfied at a specific point in time, the terminal may select and monitor only some of the search space sets configured to satisfy Condition A at that point in time, and the base station may transmit a PDCCH to the selected search space sets.

[0141] You can follow the method below to select some of the navigation spaces from the entire set of configured navigation spaces.

[0142] [Method 1]

[0143] If condition A for PDCCH is not satisfied at a specific time point (slot),

[0144] The terminal (or base station) may preferentially select a search space set whose search space type is set as a common search space among the search space sets existing at that time, over a search space set whose search space type is set as a terminal-specific search space.

[0145] When all sets of search spaces configured as common search spaces have been selected (i.e., when Condition A is satisfied even after selecting all search spaces configured as common search spaces), the terminal (or base station) may select sets of search spaces configured as terminal-specific search spaces. In this case, if there are multiple sets of search spaces configured as terminal-specific search spaces, the search space set with a lower search space set index may have a higher priority. Considering the priority, sets of terminal-specific search spaces may be selected within the range where Condition A is satisfied.

[0147] Figure 6 is a diagram illustrating DRX (Discontinuous Reception).

[0148] DRX (Discontinuous Reception) is an operation in which a terminal using a service receives data discontinuously while in an RRC connected state, where a wireless link is established between the base station and the terminal. When DRX is applied, the terminal can turn on the receiver at specific points to monitor the control channel, and turn off the receiver if no data is received for a certain period to reduce the terminal's power consumption. DRX operation can be controlled by a MAC layer device based on various parameters and timers.

[0149] Referring to FIG. 6, Active time (605) is the time during which the terminal wakes up at each DRX cycle to monitor the PDCCH. Active time (605) can be defined as follows.

[0151] - drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running; or

[0152] - a Scheduling Request is sent on PUCCH and is pending; or

[0153] - 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

[0155] drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer, etc. are timers whose values ​​are set by the base station, and have the function of setting the terminal to monitor PDCCH when certain conditions are satisfied.

[0156] drx-onDurationTimer (615) is a parameter for setting the minimum time the terminal stays awake in the DRX cycle. drx-InactivityTimer (620) is a parameter for setting the additional time the terminal stays awake when receiving a PDCCH (630) instructing a new uplink transmission or downlink transmission. drx-RetransmissionTimerDL is a parameter for setting the maximum time the terminal stays awake to receive a downlink retransmission in the downlink HARQ procedure. drx-RetransmissionTimerUL is a parameter for setting the maximum time the terminal stays awake to receive an uplink retransmission grant in the uplink HARQ procedure. drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, and drx-RetransmissionTimerUL can be set, for example, to time, number of subframes, number of slots, etc. ra-ContentionResolutionTimer is a parameter for monitoring the PDCCH in the random access procedure.

[0157] The inActive time (610) is the time during which the PDCCH is not monitored or / or the PDCCH is not received during the DRX operation. The remaining time after subtracting the Active time (605) from the total time of performing the DRX operation may be the inActive time (610). If the terminal does not monitor the PDCCH during the Active time (605), it may enter a sleep or inActive state to reduce power consumption.

[0158] The DRX cycle refers to the period during which a terminal wakes up and monitors the PDCCH. In other words, it refers to the time interval or on-duration occurrence cycle between when the terminal monitors a PDCCH and when it monitors the next PDCCH. There are two types of DRX cycles: short DRX cycle and long DRX cycle. The short DRX cycle can be applied optionally.

[0159] Long DRX cycle (625) is the longer of the two DRX cycles set in the terminal. While operating as Long DRX, the terminal restarts drx-onDurationTimer (615) at a point where Long DRX cycle (625) has elapsed from the starting point (e.g., start symbol) of drx-onDurationTimer (615). When operating as Long DRX cycle (625), the terminal may start drx-onDurationTimer (615) in a slot after drx-SlotOffset in a subframe satisfying Equation 2 below. Here, drx-SlotOffset refers to the delay before starting drx-onDurationTimer (615). drx-SlotOffset can be set, for example, as time, the number of slots, etc.

[0161] [Mathematical Formula 2]

[0162] [(SFN

[0164] At this time, drx-LongCycleStartOffset can be used to define the subframe to start the Long DRX cycle (625) and drx-StartOffset can be used to define the subframe to start the Long DRX cycle (625). drx-LongCycleStartOffset can be set, for example, to time, number of subframes, number of slots, etc.

[0166] In the following, we will specifically explain the carrier aggregation and scheduling methods in 5G communication systems.

[0167] A terminal can receive multiple cells (Cell or CC (Component Carrier)) from a base station and can receive a setting regarding whether cross-carrier scheduling is performed for the cells set to the terminal. If a specific cell (Cell A, Scheduled Cell) is set for cross-carrier scheduling, PDCCH monitoring for Cell A is not performed at Cell A but can be performed at another cell (Cell B, Scheduling Cell) designated for cross-carrier scheduling. In this case, the Scheduled Cell (Cell A) and the Scheduling Cell (Cell B) can be set with different numerologies. Here, the numerology may include subcarrier spacing, cyclic prefix, etc. When the numerologies of cell A and cell B are different, when cell B's PDCCH schedules cell A's PDSCH, a minimum scheduling offset as follows may be additionally considered between PDCCH and PDSCH.

[0168] [Cross-Carrier Scheduling Method]

[0169] ■ Subcarrier spacing of Cell B (μ B ) is the subcarrier spacing (μ) of cell A AIf it is smaller than ), the PDSCH can be scheduled starting from the next PDSCH slot corresponding to X symbols after the last symbol of the PDCCH received at Cell B. Here, X is μ B It may vary depending on, and μ B When =15kHz, X=4 symbols, μ B When =30kHz, X=4 symbols, μ B When =60kHz, X can be defined as 8 symbols.

[0170] ■ Subcarrier spacing of Cell B (μ B ) is the subcarrier spacing (μ) of cell A A If it is greater than ), the PDSCH can be scheduled starting from the point X symbols after the last symbol of the PDCCH received by Cell B. Here, X is μ B It may vary depending on, and μ B When =30kHz, X=4 symbols, μ B When =60kHz, X=8 symbols, μ B When =120kHz, X can be defined as 12 symbols.

[0172] Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Although embodiments of the present disclosure are described below using a 5G system as an example, the embodiments of the present disclosure may be applied to other communication systems having similar technical backgrounds or channel types. For example, LTE or LTE-A mobile communication and mobile communication technologies developed after 5G may be included therein. Accordingly, the embodiments of the present disclosure may be applied to other communication systems with some modifications made in the judgment of a person skilled in the art, without significantly departing from the scope of the present disclosure.

[0174] Furthermore, in describing the present disclosure, if it is determined that a detailed description of related functions or configurations could unnecessarily obscure the essence of the present disclosure, such detailed description is omitted. Additionally, the terms described below are defined in consideration of their functions within the present disclosure, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0175] In describing the present disclosure below, the term "upper layer signaling" may refer to a signaling corresponding to at least one or a combination of at least one of the following signalings.

[0176] - MIB (Master Information Block)

[0177] - SIB (System Information Block) or SIB

[0178] - RRC (Radio Resource Control)

[0179] - MAC (Medium Access Control) CE (Control Element)

[0180] In addition, L1 signaling may be a signaling corresponding to at least one or a combination of at least one of the following physical layer channels or signaling methods using signaling.

[0181] - PDCCH (Physical Downlink Control Channel)

[0182] - DCI (Downlink Control Information)

[0183] - Terminal-specific (UE-specific) DCI

[0184] - Group common DCI

[0185] - Common DCI

[0186] - Scheduling DCI (e.g., DCI used for the purpose of scheduling downlink or uplink data)

[0187] - Non-scheduling DCI (e.g., DCI not intended for scheduling downlink or uplink data)

[0188] - PUCCH (Physical Uplink Control Channel)

[0189] - UCI (Uplink Control Information)

[0191] In describing the present disclosure below, the following functions are defined and used.

[0192] - min(A,B): A function that outputs the smaller value between A and B

[0193] - max(A,B): A function that outputs the larger value between A and B

[0194] - ceil(X): A function that outputs the smallest integer greater than X.

[0195] - floor(X): A function that outputs the largest integer among integers smaller than X.

[0197] With reference to the drawings below, a time domain resource allocation method for a data channel in a next-generation mobile communication system (5G or NR system) according to various embodiments of the present invention will be described.

[0198] The base station can set a table for time-domain resource allocation information for PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel) for the terminal using upper-layer signaling (e.g., SIB, RRC signaling). For PDSCH, a table consisting of a maximum of maxNrofDL-Allocations = 16 entries can be set, and for PUSCH, a table consisting of a maximum of maxNrofUL-Allocations = 16 entries can be set. Time domain resource allocation information may include, for example, PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between the time a PDCCH is received and the time a PDSCH scheduled by the received PDCCH (Physical Downlink Control Channel) is transmitted, denoted as K0) or PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between the time a PDCCH is received and the time a PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information regarding the position and length of the start symbol for which the PDSCH or PUSCH is scheduled within the slot, and the mapping type of the PDSCH or PUSCH. For example, information such as that shown in the table below may be notified from the base station to the terminal (see [Table 7] and [Table 8] mentioned above).

[0199] According to one embodiment of the present disclosure, a base station may notify a terminal of one of the entries in a table for time domain resource allocation information via L1 signaling (e.g., DCI) (e.g., indicated by the 'time domain resource allocation' field within the DCI). The terminal may obtain time domain resource allocation information for PDSCH or PUSCH based on the DCI received from the base station.

[0200] 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 referred to as "Self-Slot Scheduling".

[0201] If an entry is indicated where the K0 / K2 value is greater than 0, this may mean that the PDCCH and the data channel are scheduled in different slots. This is referred to as "cross-slot scheduling".

[0202] In next-generation mobile communication systems (5G or NR systems), cross-slot scheduling can be utilized to reduce the power consumption of the terminal. If cross-slot scheduling is supported, the terminal can operate in sleep mode between the time it receives the PDCCH and the time data channel transmission and reception occur, thereby reducing power consumption. Additionally, if cross-slot scheduling is supported, the terminal can extend the processing time for the PDCCH, and by increasing the computation speed, it can reduce power consumption. Furthermore, time-domain scheduling information for the PDCCH can only be finally obtained after decoding is completed following the reception of the PDCCH. Therefore, since the terminal cannot know whether the PDCCH is scheduled during the time interval of receiving and decoding the PDCCH, it may need to perform buffering on OFDM symbols for which the PDCCH can be scheduled, which can significantly increase the power consumption of the terminal. If the terminal can know the time domain resource allocation information for the PDSCH in advance before decoding the PDSCH, that is, if it can know in advance that cross-slot scheduling will occur, the terminal can minimize buffering for unnecessary PDSCH, thereby reducing power consumption.

[0203] To reduce the power consumption of the terminal, the base station may instruct the terminal via upper layer signaling or L1 signaling to use a minimum value of K0 / K2 for scheduling on the data channel. The terminal can expect that scheduling will always be performed with a K0 / K2 value that is greater than or equal to the minimum value of K0 / K2 received from the base station. For convenience of explanation, the minimum value of K0 / K2 instructed by the base station to the terminal is referred to as the "minimum offset."

[0204] The terminal may be instructed by the base station to receive a minimum offset value via a DCI that schedules PDSCH or PUSCH (e.g., DCI format 1_1 or DCI format 0_1) or a non-scheduled DCI (e.g., a new DCI format defined for power reduction purposes or a new RNTI defined for power reduction purposes or DCI format 2_0 or DCI format 2_1, etc.). The terminal receives from the base station a minimum offset value for K0 (K0 min Minimum offset value for ) and K2 (K2 min For ), receive them separately with different values, or the minimum offset value (K) for K0 and K2 min You can receive a single value with ).

[0205] In some embodiments of the present disclosure, the terminal receives from a base station a minimum offset value (K0) for K0. min Minimum offset value for ) and K2 (K2 min Regarding ), different values ​​can be received separately. That is, the terminal is K0 min and K2 min Each can receive a set of candidate values ​​for . The terminal K0 in DL DCI format (e.g., DCI format 1_1). min You may be instructed to do so, and K2 in UL DCI format (e.g., DCI format 0_1). min It can be instructed to. The terminal receives K0 min and K2min Regarding the application delay time for , different application delay time #0 and application delay time #2 can be assumed, respectively. In this case, the terminal can relax the PDCCH processing time only within application delay time #0, and cannot relax the PDCCH processing time within application delay time #2. Or the terminal received K0 min and K2 min Regarding the application delay time for , a single application delay time can be assumed, where the application delay time is K0 min It can be determined as a function for.

[0206] In some embodiments of the present disclosure, the terminal receives from a base station a minimum offset value (K) for K0 and K2. min A single value can be received as ). The terminal has K to be applied commonly to K0 and K2. min A set of candidate values ​​for can be set. The terminal can be instructed to Kmin in DL DCI format (e.g., DCI format 1_1) or / and UL DCI format (e.g., DCI format 0_1).

[0207] In some embodiments of the present disclosure, the terminal may receive, through upper layer signaling, whether to receive minimum offset values ​​for K0 and K2 separately from the base station or to receive them as a single value.

[0208] In the present disclosure below, one minimum offset value K min Describe assuming the case where this is indicated, K0 min and K2 min Even if each of these is indicated separately, the contents of the present disclosure may apply in the same way.

[0209] According to one embodiment of the present disclosure, a terminal can expect that scheduling will be performed only on entries among the pre-configured time domain resource allocation table values ​​where the K0 / K2 value is greater than or equal to the indicated minimum offset, based on a minimum offset received from a base station. For example, let us assume a case where a base station has configured a time domain resource allocation table for the following PDSCH in the terminal.

[0210]

[0211] If the base station is instructed to the terminal that the minimum offset value is 3, the terminal can expect not to be scheduled for entries with a K0 value smaller than 3, i.e., entry indices 1, 2, 3, 4, 5, and 6, and can expect to be scheduled only for the remaining entries, i.e., entry indices 7, 8, ..., 16. For the convenience of explanation, the following terms are defined.

[0212] - Valid entry : Among the pre-configured time domain resource allocation table values, an entry where the K0 / K2 value is greater than or equal to the received minimum offset, which can be used for scheduling

[0213] - Invalid entry : Among the pre-configured time domain resource allocation table values, entries where the K0 / K2 value is greater than or equal to the received minimum offset, and which cannot be used for scheduling

[0214] According to one embodiment of the present disclosure, a terminal receives candidate values ​​for N minimum offset values, e.g., K, through upper layer signaling from a base station. min (0), K min (1), ..., K min (N-1) can be set, and one of the N minimum offset values ​​set via L1 signaling can be specified. For example, two minimum offset values ​​are K min (0)=2, Kmin (1) can be set to 4, and K to the terminal through a 1-bit indicator of L1 signaling (e.g., DCI, DCI format 0_1 / 1_1, etc.). -min (0) or K min (1) One of the following may be indicated. As another example, one minimum offset value K min (1)=4 can be set, and in this case K min (0) = 0 or K min (0) can be considered an operation that does not consider any restrictions in the time domain resource allocation table (i.e., assumes all entries in the pre-configured time domain resource allocation table are valid entries), in which case the base station sends K to the terminal via a 1-bit indicator of L1 signaling (e.g., DCI, DCI format 0_1 / 1_1, etc.) to the terminal. -min (0) or K min (1) You can indicate one of them.

[0215] According to one embodiment of the present disclosure, a terminal may receive a minimum offset value through a DCI transmitted from a base station at a specific point in time, and may apply the received minimum offset value from a specific point in time after the time at which the minimum offset value was received. For example, the terminal may be instructed to receive a minimum offset value through a DCI received via a PDCCH transmitted from a base station at time T0, and for a certain period of time (T delay A point in time after ) (T app The content of the newly acquired minimum offset value can be applied from ). In this case, T app is T0 and T delay It can be expressed as a function of . If the terminal receives a DCI from the base station indicating a minimum offset value at time T0, the terminal [sets] the indicated minimum offset value to T appIt may not have been expected to be applied previously. Here, applying the minimum offset value may refer to an action of determining the entries in the time domain resource allocation table configured for upper-layer signaling as valid or invalid entries based on the minimum offset value received by the terminal, and applying them.

[0216] FIG. 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 [provides] a minimum offset value, K to the terminal. min The terminal can be instructed to the DCI via a PDCCH (704) transmitted at a specific point in time (700). The terminal receives K from the base station at time T-0 (corresponding to slot n (710) in the example of FIG. 7). min The terminal can receive instructions via PDCCH (704). The terminal receives K from the base station. min value, K min From the point in time T0 when it was received (corresponding to slot n (710) in the example of FIG. 7), a certain amount of time (T delay A point in time (T) after ) app It can be applied from ). In one example of FIG. 7, the terminal receives K from slot n (710). min Shows the application of to slot n+k (k=3) (713). K min The time of receiving and the received K min Let the time interval between the application points be named "Application Delay" (720) and T delay It should be written as .

[0217] During the time indicated by the aforementioned application delay time or minimum offset, or during a specific time interval, the terminal may operate in "power reduction mode." Here, the terminal operating in power reduction mode may mean operating in at least one of the following or a combination of one or more.

[0219] - Operation to reduce power consumption by increasing processing time for PDCCH

[0220] - Operation to reduce power consumption by not performing buffering for OFDM symbols

[0221] - Operation that reduces power consumption by operating in sleep mode

[0222] In other words, there is an advantage in that the power consumption of the terminal can be reduced by considering the aforementioned application delay time.

[0224] The aforementioned application delay time can be determined, for example, as a function of the following parameters.

[0225] - Subcarrier spacing of PDCCH (μ0)

[0226] - Subcarrier spacing of PDSCH (μ1)

[0227] - Subcarrier spacing of PUSCH (μ2)

[0228] - PDCCH processing time (T proc1 )

[0229] - Relaxed PDCCH processing time (corresponding to a longer time than the above PDCCH processing time) (T proc2 )

[0230] - PDCCH-related configuration information (e.g., start or end symbol position of PDCCH, control domain (CORESET)-related configuration information (control domain symbol length, control domain 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.)

[0231] - Minimum application delay (T delay,min )

[0232] - Maximum application delay time (T delay,max )

[0233] - Whether Cross-carrier scheduling is enabled

[0234] - Minimum value of scheduling offset for PDSCH (K0 min,2 )

[0235] - Minimum scheduling offset for PUSCH (K2 min,2 )

[0236] - The minimum offset value assumed by the terminal prior to the newly indicated minimum offset value (i.e., the minimum offset value assumed by the terminal at the time (T0) when the minimum offset value was received) (K0 min,pre , K2 min,pre , K min,pre )

[0237] In the following, various embodiments of the method for determining the aforementioned application delay time will be described.

[0239] In describing the present disclosure, the following parameters are defined and used.

[0240] - T0: Time when the DCI containing the minimum offset value is received

[0241] - T delay : Application delay time

[0242] - T app : The point in time when the received minimum offset value is applied

[0244] According to one embodiment of the present disclosure, the application delay time (T) in slot n delay ) is the subcarrier spacing of PDCCH (μ0), the subcarrier spacing of PDSCH (μ1) or the subcarrier spacing of PUSCH (μ2), and the minimum application delay time (T delay,min ), the minimum offset value assumed by the terminal in slot n (K min,pre It can be expressed as a function of ).

[0245] According to one embodiment of the present disclosure, a time (T0) at which a DCI indicating a minimum offset is received and an application delay time (T delayThis can be defined in slot units. For example, if the terminal acquires an indicator for the minimum offset at T0 (=slot n), then T app = T0(=slot n)+T delay The newly specified minimum offset value can be applied from.

[0246] According to one embodiment of the present disclosure, considering a situation where the subcarrier spacing of the control channel and the data channel may be different, the application delay time (T delay Scaling considering the subcarrier spacing of the PDCCH, PDSCH, or PUSCH may be applied. More specifically, if a terminal receives a DCI containing an indicator for the minimum offset in slot n based on the PDCCH subcarrier spacing (μ0), and the subcarrier spacing of the PDSCH or PUSCH scheduled by the DCI is μ1 or μ2, the slot index is recalculated and the application delay time (T delay The timing for applying the minimum offset after ) can be determined. A scaling factor, S, may be considered to recalculate the slot index. For example, if a PDCCH containing an indicator for the minimum offset is received at slot n, g((slot n + T delay A newly specified minimum offset value can be applied from ) * S). Here, g() can correspond to any function. For example, S can correspond to a scaling factor based on the subcarrier spacing of the data channel, e.g., S=2 (μ1-μ0) (or S=2 (μ2-μ0) It can be defined as follows. As another example, S may correspond to a scaling factor based on the minimum (or maximum) value among the subcarrier intervals of the PDCCH and data channels, 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)) can be determined.

[0247] According to one embodiment of the present disclosure, the application delay time (T delay In determining ), the minimum offset value (K) assumed by the terminal prior to the newly indicated minimum offset value min,pre ) can be considered. For example, T delay Ga T min,pre It can be expressed as a function of . This may have advantages in terms of reducing the power consumption of the terminal. To explain more specifically, for example, if the terminal is T min,pre Assuming =X, the terminal may extend the processing time for the PDCCH based on the value of X for the purpose of reducing power consumption. For example, the terminal may perform decoding for the PDCCH by extending the processing time for the PDCCH by X. In this case, the terminal may complete decoding the DCI indicating the new minimum offset value after X, and therefore the terminal may obtain the new minimum offset value after X time. Accordingly, the application delay time T delay can be at least equal to or greater than X. Therefore, the application delay time (T delay ) to T min,pre Defining it with consideration may have an advantage in increasing the effect of reducing power consumption of the terminal.

[0248] According to one embodiment of the present disclosure, the application delay time (T delay In determining the minimum application delay time (T delay,min ) can be considered. T delay,min can correspond to the minimum value of the application delay time that the terminal can assume, and T delay,min It can be defined as a value where ≥0. If T delay =T delay,minIf =0, this may mean that the terminal applies the received minimum offset value to the slot in which the minimum offset value was received. T delay,min The value can be set by the base station to the terminal through upper-layer signaling, or defined as a fixed value.

[0249] Considering the aforementioned parameters, the application delay time (T delay ) and the point in time when the newly specified minimum offset is applied (T app ) can be determined according to the following mathematical formula. In the following mathematical formula, each parameter may follow the contents of the aforementioned embodiment.

[0250] [Mathematical Formula 3]

[0251] T app = ceil(T0+ T delay ) * S where T delay = max(K min,pre , T delay,min )

[0252] The application delay time described by the above mathematical formula 3 is merely an example and can be expressed by various mathematical formulas.

[0253] According to one embodiment of the present disclosure, during a time interval corresponding to an application delay time, if there exists a PDCCH monitoring occasion configured to be monitored from a base station, the terminal may monitor the PDCCH according to the configuration, and through the DCI transmitted within the application delay time, K min Additional indicators for can be received. Specifically, using FIG. 7 as an example, the terminal receives K through the DCI transmitted at the PDCCH monitoring occasion (704) of slot n (710). min,1 The terminal can receive K received from the PDCCH monitoring occasion (704). min For , K in slot (slot n+3 (713) in FIG. 7) after the application delay time (720). min,1The terminal can apply (operation (701)). The terminal can monitor the PDCCH monitoring occasion (705) in another slot n+1 (711) within the application delay time corresponding to (720), and through the DCI transmitted at the PDCCH monitoring occasion of (705), K min,2 The terminal can additionally receive (operation 702). The terminal receives K from the PDCCH monitoring occasion (703). min Regarding , in slot (slot n+4 (714) in FIG. 7) after the application delay time (721), K min,2 can be applied (operation 703). Consequently, the terminal has K as the minimum offset value at slot n+3 (713). min,1 We can assume that, at slot n+4 (714), the minimum offset value is K min,2 It can be assumed that, in other words, the minimum offset value may vary for each slot depending on the case.

[0254] As mentioned above, the terminal received K via the PDCCH that was transmitted first. min value (this is K min,1 A new K with the PDCCH transmitted thereafter before applying (indicated as ). min value (this is K min,2 If (indicated by ) is received and applied, there may be a disadvantage in that the effect of reducing the terminal's power consumption may be diminished. Taking Fig. 7 as an example, the terminal K at slot n+3 min,1 We can assume, and K in slot n+4 min,2 It can be assumed that. The terminal adjusts the processing speed for the PDCCH based on the assumption of a minimum offset value in each slot, and the larger the minimum offset value in that slot, the greater the extension of the processing speed for the PDCCH, thereby allowing for a reduction in power consumption. If, in the above example, K min,1 =4, K min,2If = 2, the terminal has K for PDCCH processing in slot n+3. min,1 While applying processing time assuming =4, K in slot n+4 min,2 If it needs to be changed to =2, and consequently the processing for the PDCCH in slot n+3 extends beyond slot n+4, the existing K min,1 Since it cannot be assumed to be =4, the effect of reducing power consumption may be diminished.

[0255] Meanwhile, in current 5G, out-of-order scheduling is not allowed in the scheduling method for data channels as follows.

[0256] - 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.

[0257] - 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.

[0258] Based on the aforementioned 5G standard, out-of-order scheduling can be defined as follows.

[0259] [Out-of-order Scheduling]

[0260] - For any two PDSCHs with HARQ process IDs, the terminal that scheduled the first PDSCH with start symbol j through the PDCCH with last symbol i, and the terminal that scheduled the PDSCH with a start symbol earlier than the last symbol of the first PDSCH through the PDCCH whose last symbol is not later than i

[0261] - For any two PUSCHs with HARQ process IDs, the first PUSCH with a starting symbol j is scheduled through the PDCCH with a last symbol i, and the terminal through the PDCCH whose last symbol is not later than i

[0262] As mentioned above, the terminal received K via the PDCCH that was transmitted first. min value (this is K min,1 A new K with the PDCCH transmitted thereafter before applying (indicated as ). min value (this is K min,2 When receiving and applying (denoted as ), if K min,2 Ga Kmin,1 If it is smaller, out-of-order scheduling may occur, which may affect the data transmission and reception operations of the terminal.

[0263] Therefore, in order to solve the aforementioned problems, a restriction may be required on the minimum offset value that the terminal can assume for each slot, or a restriction may be required on the timing at which the minimum offset value can be updated. Below, various embodiments for solving the aforementioned problems will be described in detail.

[0265] <First Embodiment>

[0266] According to some embodiments of the present disclosure, the terminal may not expect a new minimum offset value to be indicated from the PDCCH transmitted during a time interval corresponding to the application delay time. Specifically, referring to FIG. 7, the terminal receives a new minimum offset value K in slot n (710). min,1 It can receive (700), and the received K min,1 It can be applied at slot n+3 (713), which is after the application delay time (720). At this time, the terminal receives K min,1 K from the DCI transmitted on PDCCH monitoring occasions (705, 706 in the example of FIG. 7) existing between the application delay time (720) for min,1 Another minimum offset value (K) that has a different value from . min ) It may not be expected that a value will be indicated. If the terminal receives a new minimum offset value from the PDCCH transmitted during the time interval corresponding to the application delay time, it may perform one or more of the following operations.

[0267] - Method 1: The terminal may consider the received DCI as an error and ignore the entire contents of the received DCI.

[0268] - Method 2: The terminal K of the received DCImin It is possible to ignore only the value, determine the remaining contents of the DCI as valid, and operate according to the instructions of the DCI.

[0270] In an operation according to the first embodiment of the present disclosure described above, a problem may occur if there is a difference in understanding of the time interval during which a new minimum offset value cannot be indicated between the base station and the terminal.

[0271] To explain specifically through Fig. 8, in Fig. 8, the terminal receives K from the base station min (0)=2, K min (1)=4 can be set (800), and the minimum offset value assumed by the terminal in slot 0 (810) is K pre = 2 (820). In one example of FIG. 8, the terminal is K transmitted to the PDCCH in slot 0 (810). min Regarding, the Application Delay (AD) is T delay =K pre It can be assumed that =2. In one example of FIG. 8, the base station moves from slot 0 (810) to DCI K min,1 An example is illustrated of a case where =4 (830) was instructed, but the terminal missed the corresponding DCI. The base station has the same minimum offset value, K, in slot 1 (811) existing within slot 0 (810) and the application delay time (840). min,1 =K min,2 =4 can be transmitted. On the other hand, if the terminal misses the DCI transmitted from slot 0 (810) and receives the DCI transmitted from slot 1 (811), the terminal has an application delay time, T based on slot 1 (811). delay =K pre We can assume that =2 (841), and accordingly, the minimum offset value K transmitted from slot 2 (812) existing within the application delay time (841). min,3 For (832), the minimum offset value K transmitted from slot 1 (811) min,2You can expect it to be the same as (831). However, the base station has the same K in slot 0 (810) and slot 1 (811). min You can transmit a value, and in slot 2 (812), another K min The value, i.e., K min,3 =2(832) can be transmitted. Accordingly, the terminal can transmit K transmitted from slot 2 (812). min,3 (832) is judged to be an invalid value and is treated as an error and ignored.

[0272] As mentioned above, there must be a common understanding between the base station and the terminal regarding the point in time when a new minimum offset value can (or cannot be) be indicated (or likewise regarding the application delay time).

[0274] <Example 1-1>

[0275] According to some embodiments of the present disclosure, a terminal may receive a time point at which a new minimum offset value may be indicated (or a time point at which an application delay time is applied) from a base station via upper-layer signaling. For example, the base station may provide the terminal with information via upper-layer signaling regarding a set of slot indices (or indices for possible time resource units, such as symbols, frames, system frames, or PDCCH monitoring occasion indices) at which a new minimum offset value may be indicated. The aforementioned slot indices shall be referred to as "minimum offset effective slots."

[0276] For example, a terminal can receive the following settings from a base station.

[0277] Slot Index 0 1 2 3 4 5 6 7 8 9 Whether minimum offset can be specified O X O X O X O X O X

[0278] In the table above, O may correspond to a slot where a new minimum offset value can be indicated, and X may correspond to a slot where a new minimum offset value cannot be indicated. That is, in the above example, the terminal can expect to receive a new minimum offset value through the DCI transmitted at the slot index {0, 2, 4, 6, 8}, and at the slot index {1, 3, 5, 7, 9}, it can expect to receive a minimum offset value identical to the value indicated at the slot index {0, 2, 4, 6, 8} (if there is a value indicated).

[0279] As another example, the terminal receives information from the base station regarding the minimum offset effective slot index and candidate values ​​of the set minimum offset, e.g., K min (0), K min (1), ..., K min (N-1), can be set for each. For example, the terminal is K min (0)=2, K min (1) If set to 4, the minimum offset valid slot can be set as follows.

[0280] Slot Index 0 1 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

[0281] As in the example above, when multiple sets of minimum offset effective slot indices are set, the terminal has a currently assumed minimum offset value of K pre = K min If (X), K min We can assume a minimum offset effective slot index set for (X). For example, K pre If =2, the terminal is K min We can assume {0, 2, 4, 6, 8} as the minimum offset valid slot corresponding to (0)=2, and K pre If =4, the terminal is K min (1) We can assume {0, 4, 8} as the minimum offset valid slot corresponding to 4.

[0282] More specifically, information regarding the minimum offset valid slot can be set, for example, in the following way.

[0283] - Method 1 : It can be set as a bitmap and a period. For example, within P slots, a pattern for the minimum offset valid slot can be set as a P-bit bitmap, and the corresponding bitmap pattern can be repeated for a period of P slots. P can also be set. A single set of minimum offset valid slots can be set, or a total of N sets can be set by individually setting them for the configured minimum offset values.

[0284] - Method 2 : The bitmap is set, and the period can be implicitly determined. For example, the period can be implicitly determined by the set minimum offset candidate values ​​or the application delay time. As an example, the period P is the set minimum offset candidate values, K min (0), K min (1), ..., K min (N-1) (or application delay time values ​​that can be determined by each minimum offset candidate value), can be determined as M(≥1) times the minimum value (or maximum value). Or, K, the candidate values ​​of the minimum offset set with a total of N periods, P(0), P(1), ..., P(N-1). min (0), K min (1), ..., K min (N-1) (or application delay time values ​​that can be determined by each minimum offset candidate value), each can be determined by M (≥1) times. For one or more determined P, a pattern for the minimum offset effective slot within P slots can be set as a P-bit bitmap, and the bitmap pattern can be repeated for a P slot period. A single set of minimum offset effective slots can be set, or a total of N sets can be set by setting each for the set minimum offset values.

[0285] - Method 3:It can be set by an offset (or initial starting point) and a period. For example, an offset (or the starting point of the period) and a period can be set in slot units.

[0286] - Method 4: An offset (or initial starting point) can be set, and the period can be implicitly determined. For example, a slot-unit offset (or the corresponding period start point) can be set, and the period can be implicitly determined by other system parameters. As an example, candidate values ​​for the minimum offset, K, where the period P is set. min (0), K min (1), ..., K min (N-1) (or application delay time values ​​that can be determined by each minimum offset candidate value), can be determined as M(≥1) times the minimum value (or maximum value). Or, K, the candidate values ​​of the minimum offset set with a total of N periods, P(0), P(1), ..., P(N-1). min (0), K min (1), ..., K min (N-1) (or application delay time values ​​that can be determined by each minimum offset candidate value), each can be determined by a factor of M (≥1). The offset can be set for one value, or for one or more implicitly determined periods P, so a total of N values ​​can be set.

[0288] 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 way.

[0289] In the first embodiment of the present disclosure, the slot index may be replaced with an index related to PDCCH monitoring, such as a PDCCH monitoring occasion index, and applied in the same way. For example, the PDCCH monitoring occasion index may correspond to an index of a PDCCH monitoring occasion determined as a set of search spaces in which a DCI indicating a minimum offset value is transmitted.

[0291] FIG. 9 is a diagram illustrating the operation of a terminal according to the first-1 embodiment of the present disclosure. The terminal may receive setting information for a minimum offset effective slot in step (900). In step (901), the terminal K min It can determine whether the transmitted slot corresponds to a minimum offset valid slot. If, in step (901), it is determined that the slot corresponds to a minimum offset valid slot, the terminal receives the received K min It can be expected that the value will be indicated as a new value that is the same as or different from the previous slot. If, in step (901), it is determined that the slot does not correspond to a minimum offset valid slot, the terminal receives K min You can expect the value to be indicated as the same value as the previous slot, or you may not expect it to be indicated as a different value.

[0293] By limiting the time at which a new minimum offset value can be transmitted through the above-described 1-1 embodiment, the minimum offset value of the terminal is prevented from changing frequently, thereby solving the various problems that may occur as described above, and thereby significantly reducing the power consumption of the terminal.

[0295] <Example 1-1-1>

[0296] According to some embodiments of the present disclosure, a terminal may receive a time when it can be updated to a new minimum offset value in advance from a base station via upper-layer signaling. For example, the base station may set information via upper-layer signaling regarding a set of slot indices (or indices for possible time resource units, such as symbol or frame or system frame or PDCCH monitoring occasion index) to which a new minimum offset value may be indicated to the terminal. The aforementioned slot index shall be referred to as a "minimum offset applicable slot."

[0297] Specific embodiments and setting methods can all be applied identically by replacing "minimum offset effective slot" with "minimum offset applicable slot" in the aforementioned Embodiment 1-1. The terminal receives K min If the slot at the time when the value is to be applied is a slot set to "minimum offset applicable slot," then K that received the minimum offset value min It can be updated with the value, and if received K min If the slot at the time when the value is to be applied is not a slot set as a "minimum offset applicable slot," then K that received the minimum offset value min Instead of updating the value, the previous minimum offset value (or the currently assumed minimum offset value) can be maintained, or a selected default value can be assumed. The default value is, for example, K min = 0 or may be considered as an operation that does not consider any restrictions on the time domain resource allocation table (i.e., assumes all entries in the pre-configured time domain resource allocation table are valid entries).

[0299] FIG. 10 is a diagram illustrating the operation of a terminal according to the first-1-1 embodiment of the present disclosure. The terminal may receive setting information for a minimum offset applicable slot in step (1000). The terminal receives K in step (1001).min It can be determined whether the slot to which the minimum offset is to be applied corresponds to a minimum offset applicable slot. If, in step (1001), it is determined that the slot corresponds to a minimum offset applicable slot, the terminal receives the received K min The minimum offset value can be updated with the value. If, in step (1001), it is determined that the corresponding slot does not correspond to a slot where the minimum offset is applicable, the terminal can update the received K min Instead of updating the minimum offset value to a value, you can maintain the previously assumed minimum offset value or assume a selected default value.

[0301] By limiting the time 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 resolving the various problems that may occur as described above, and thereby significantly reducing the power consumption of the terminal.

[0303] <Example 1-1-2>

[0304] The above-described embodiment 1-1 and embodiment 1-1-1 can be applied in combination. That is, the terminal can receive both the "minimum offset effective slot" and the "minimum offset applicable slot" from the base station through upper layer signaling, and accordingly, the above-described method can be applied in the same way to each slot.

[0306] <1-2 Embodiment>

[0307] According to some embodiments of the present disclosure, by adjusting the monitoring occasion of a search space set configured to monitor a DCI format indicating a minimum offset value, the time at which the minimum offset value can be transmitted is limited (e.g., so that a new minimum offset value is not transmitted within an application delay time), thereby limiting the frequency of changes to the minimum offset value.

[0308] According to some embodiments of the present disclosure, a terminal may not expect the monitoring period to be set to a value less than T or to be monitored at a period less than T for a set of search spaces configured to monitor a DCI format including a field for a minimum offset value.

[0309] According to some embodiments of the present disclosure, a terminal may expect that a monitoring period is set to a value greater than T or monitored for a period of T for a set of search spaces configured to monitor a DCI format including a field for a minimum offset value.

[0310] According to some embodiments of the present disclosure, a terminal may expect the monitoring period to be set to T or to monitor at a period greater than T for a set of search spaces configured to monitor a DCI format including a field for a minimum offset value.

[0311] At this time, the above T can be determined in the following way.

[0312] - Method 1: T can be predefined as part of the system parameters.

[0313] - Method 2: T may correspond to a value reported to the base station through the terminal's capability signaling.

[0314] - Method 3: T can be configured by the base station to the terminal through upper-layer signaling.

[0315] - Method 4: T can be determined by other system parameters set by the base station to the terminal. For example, T is candidate values ​​of the minimum offset set by the base station to the terminal, e.g., K min (0), K min (1), ..., K min It can correspond to the smallest value (or largest value) among (N-1).

[0316] - Method 5: T can be determined by other system parameters set by the base station on the terminal. For example, T may correspond to the largest value (or smallest value) among the application delay times that the terminal can assume.

[0317] - Method 6: T may be determined by system parameters instructed by the base station to the terminal. For example, T may correspond to the minimum offset value (or application delay) currently assumed by the terminal. That is, the monitoring period or monitoring occasion of the search space set configured to monitor the DCI format indicating the minimum offset value may be changed by the minimum offset value (or application delay) currently assumed (or instructed).

[0318] By limiting the time at which a new minimum offset value can be applied through the aforementioned first and second embodiments, the minimum offset value of the terminal is prevented from being frequently changed, thereby resolving the various problems that may occur as described above, and thereby significantly reducing the power consumption of the terminal.

[0320] <Example 1-2-1>

[0321] According to some embodiments of the present disclosure, a terminal may be configured to have one or more sets of search spaces configured to monitor a DCI format indicating a minimum offset value. For example, the terminal may have candidate values ​​of a minimum offset, K, for example, a period P, set. min For (X), search space set#X can be set. The terminal has a minimum offset value currently assumed to be K min In the case of (X), search space set #X can be monitored. The terminal can receive a DCI format indicating a minimum offset value from search space set #X.

[0322] FIG. 11 is a diagram illustrating a terminal operation according to an embodiment 1-2-1 of the present disclosure. In step 1100, the terminal [is] candidate values ​​of the minimum offset, Kmin (0), K min (1), ..., K min Configuration information for (N-1) can be received. In step 1101, the terminal can receive configuration information for the search space sets, search space set #0, ..., search space set #N-1 for the candidate values ​​of each minimum offset. In step 1102, the terminal assumes that the minimum offset value currently assumed is K min It can be determined whether (X) is true. If the minimum offset value currently assumed in Step 1102 is K min If it is determined to be (X), the terminal can perform monitoring on the search space set #X corresponding to the minimum offset value in step 1103, and K from search space set #X min The value can be received. If the minimum offset value currently assumed in step 1102 does not correspond to any of the set minimum offset values, the terminal in step 1104 uses the default search space set (where the default search space set refers to K regardless of the minimum offset value currently assumed). min It can monitor (which may correspond to a search space set additionally configured to monitor DCI containing indicators).

[0324] <Second Embodiment>

[0325] According to some embodiments of the present disclosure, the terminal may allow a new minimum offset value to be indicated from a PDCCH transmitted during a time interval corresponding to an application delay time. Specifically, referring to FIG. 7, the terminal allows a new minimum offset value K in slot n (710). min,1 It can receive (700), and the received K min,1 It can be applied at slot n+3 (713), which is after the application delay time (720). At this time, the terminal receives K min,1K from the DCI transmitted on PDCCH monitoring occasions (703, 704 in the example of FIG. 7) existing between the application delay time (720) for min,1 Another minimum offset value (K) that has a different value from . min,2 ) can allow the value to be indicated.

[0326] That is, according to the second embodiment, when the terminal receives a new minimum offset value from the PDCCH transmitted during the time interval corresponding to the application delay time, it does not ignore the new minimum offset value and uses the existing minimum offset (K min,1 ) and the new minimum offset value (K min,2 You can apply the minimum offset by determining which of the values ​​to apply.

[0327] According to a second embodiment of the present disclosure, the terminal has K indicated from the most recently received DCI. min The minimum offset value can be updated with the value.

[0328] According to a second embodiment of the present disclosure, the terminal receives K indicated from the DCI received within the application delay time. min The application delay time for the value can be different depending on the time when the corresponding DCI is received. More specifically, the application delay time that the terminal basically assumes for the minimum offset is T delay,0 It shall be denoted as (for example, it may correspond to an application delay time that can be expressed by a function such as the aforementioned mathematical formula 3 or a similar function). The terminal, based on a specific point in time among the points in time when monitoring the DCI format indicating the minimum offset, the application delay time T delay,0 It can be assumed that the terminal has an application delay time T delay,0 The first slot assuming [this] is named "Slot A". For example, slot n (710) in FIG. 7 may correspond to slot A. The terminal [represents] K indicated in the DCI format transmitted from slot A. min ul Tdelay,0 It can be applied from a later point in time. For example, in FIG. 7, K indicated in slot n (710) in slot n+3 (713). min can be applied. The terminal is T after slot n (710). delay,0 The DCI format can be received from the PDCCH existing during the time interval corresponding to, and from this, K min It may be instructed to do so. For example, in FIG. 7, the minimum offset value K from the PDCCH for PDCCH monitoring occasions (705), (706) existing within the application delay time (720). min The terminal may additionally receive a DCI format indicating . After Slot A, within the application delay time, the terminal receives K indicated in the transmitted DCI format min Regarding the application delay time for the value T delay,0 Application delay time T different from delay,1 (k) can be applied. T delay,1 (k) is T delay,0 and K within the application time min This can be expressed as a function of the specified slot index (or slot position or offset from slot A, etc.). For example, the terminal [uses] the specified K within the application delay time after slot A. min Regarding the value of T delay,0 A shorter application delay time can be assumed. As a specific example, slot n corresponds to the aforementioned slot A, and the terminal K within the application delay time min If the slot that received it is slot n+k, then T delay,1 (k) = max(T delay,0 - k, T delay,min It can be defined as ). Here, T delay,min can be defined as the minimum possible value for the application delay time. That is, in one example of FIG. 7, slot n (710) corresponds to slot A, and T delay,0 If =3, K received from slot n+1 (711) min Regarding, application delay time Tdelay,1 (1) = 3 - 1=2 can be applied, and K received in slot n+2 (712) min Regarding, application delay time T delay,1 (2) = 3 - 2 = 1 can be applied. When the application delay time adjustment according to the above-described embodiment is applied, the terminal receives one or more K within the application delay time. min The application timing for all values ​​can be guaranteed to be the same. In one example of FIG. 7, the terminal receives K at slot n (710), slot n+1 (711), and slot n+2 (712). min All values ​​can be applied in slot n+3 (713). Through this embodiment, the problem of the minimum offset value assumed by the terminal changing frequently can be resolved.

[0329] According to a second embodiment of the present disclosure, if the terminal has a plurality of minimum offset values, e.g., K min (0), K min (1), ..., K min If (N-1) is received and all received minimum offset values ​​must be applied in the same slot X, the terminal [uses] K indicated from the most recently received DCI format among the received minimum offset values. min The minimum offset value can be updated with the value.

[0331] <Third Embodiment>

[0332] In some embodiments of the present disclosure, the terminal may not perform monitoring of the PDCCH during a time interval corresponding to the application delay time for the purpose of maximally reducing power consumption due to PDCCH monitoring. That is, during the time interval corresponding to the application delay time, if there is a PDCCH monitoring occasion configured to be monitored from the base station, the terminal may not perform monitoring for the said PDCCH monitoring occasion. Specifically, using FIG. 7 as an example, the terminal K through the DCI transmitted at the PDCCH monitoring occasion (704) of slot n (710). min,1 The terminal can receive K received from the PDCCH monitoring occasion (704). min For , K in slot (slot n+3 (713) in FIG. 7) after the application delay time (720). min,1 The terminal may apply (operation (701)). The terminal may not perform monitoring for PDCCH monitoring occasions (705) and (706) existing in other slots (slot n+1 (711), slot n+2 (712)) within the application delay time corresponding to (720). The terminal may perform monitoring again for the PDCCH monitoring occasion (707) of the slot (slot n+3 (713)) existing after the application delay time (720).

[0333] As described above, the terminal may not perform PDCCH monitoring for a specific time interval (in the above example, the application delay time). For brevity in describing the present disclosure below, the operation of not performing PDCCH monitoring will be collectively referred to as the "PDCCH Skip operation," and the time interval during which the terminal can apply the PDCCH Skip operation will be collectively referred to as the "first time interval." For example, the aforementioned application delay time may correspond to the first time interval.

[0334] Considering the PDCCH omission operation in the first time interval of the terminal described above, if the terminal performs the PDCCH omission operation while there is a difference in understanding of the first time interval between the base station and the terminal, correct transmission and reception between the base station and the terminal may be impossible. For example, in FIG. 8, the base station may assume the first time interval is slot 1 (811), and the terminal may assume the first time interval is slot 2 (812). In this case, the base station may transmit the PDCCH to the terminal via the PDCCH monitoring occasion (803) of slot 2 (812), whereas the terminal may not monitor the PDCCH monitoring occasion (803). Therefore, it may be important to ensure the same understanding of the first time interval between the base station and the terminal.

[0335] According to one embodiment of the present disclosure, the first time interval may be composed of the following information.

[0336] [Parameters related to the first time interval]

[0337] - The initial point in time to assume the first time interval (e.g., the start slot)

[0338] - Length of the first hour interval

[0339] - Repetition period of the first time interval

[0340] According to one embodiment of the present disclosure, a terminal may receive a first time interval (or a time point when the terminal first applies (or assumes) an application delay time, or a time point when the terminal applies (or assumes) an application delay time, or a time interval when a PDCCH omission operation can be applied, or a time interval when operation can be performed considering a PDCCH omission operation, etc.) in advance from a base station through upper layer signaling. As an example of a method for setting the first time interval, all or part of the "parameters related to the first time interval" may be notified from the base station to the terminal through upper layer signaling. As another example, the method for setting the first time interval may be applied identically by replacing the "minimum offset effective slot" in the above-described 1-1 embodiment with the "PDCCH omission operation impossible slot."

[0341] According to one embodiment of the present disclosure, all or part of the "first time interval related parameter" may be determined by system parameters set or currently assumed in the terminal. For example, the following methods may be considered in a method for determining the first time interval. In describing the following, a search space set configured to monitor a DCI format indicating a minimum offset value is named "search space set A".

[0342] - Method 1:The terminal can determine the first time interval from the PDCCH monitoring occasion determined by the search space set A. For example, the terminal may assume the remaining time interval, excluding the slot where the PDCCH monitoring occasion determined by the search space set A exists, as the first time interval. As another example, the terminal may determine the time interval corresponding to a specific time length (named "time interval T"; for example, a time length corresponding to the minimum offset value or application delay time currently assumed by the terminal) starting from the slot following a specific slot (named "Slot A") among the slots where the PDCCH monitoring occasion determined by the search space set A exists, as the first time interval. Therefore, the terminal may determine the time interval that repeats every time interval T+1 starting from Slot A as the entire first time interval. Here, Slot A may be set from the base station to the terminal through upper layer signaling, or may correspond to a fixed slot (e.g., Slot 0 or the first PDCCH monitoring occasions corresponding to the search space set A).

[0343] - Method 2:The terminal may assume the next slot (referred to as Slot A) as the starting point, which is the slot containing the PDCCH monitoring occasion corresponding to the search space set A that exists closest to the time point corresponding to X ms after transmitting a HARQ-ACK for the PDSCH scheduled by the DCI format indicating the minimum offset value. Starting from Slot A, the terminal may determine the time interval corresponding to a specific time length (referred to as "time interval T"; for example, the time length corresponding to the minimum offset value or application delay time currently assumed by the terminal) as the first time interval. Therefore, the terminal may determine the time interval that repeats every time interval T+1 starting from Slot A as the entire first time interval. Here, Slot A may be set from the base station to the terminal via upper layer signaling, or it may correspond to a fixed slot (e.g., Slot 0 or the first PDCCH monitoring occasions corresponding to the search space set A).

[0344] - Method 3: In some embodiments of the present disclosure, the remaining time interval excluding the slot corresponding to the aforementioned "minimum offset effective slot" may correspond to the first time interval. Or the slot corresponding to the minimum offset effective slot

[0345] - Method 4: In some embodiments of the present disclosure, the remaining time interval excluding the slot corresponding to the aforementioned "minimum offset applicable slot" may correspond to the first time interval.

[0346] - Method 5: It may be determined by a method corresponding to a combination of all or part of the aforementioned methods.

[0348] According to one embodiment of the present disclosure, the first time interval may vary depending on the minimum offset value or application delay time currently assumed by the terminal.

[0350] In some embodiments of the present disclosure, the terminal may perform a "PDCCH omission operation" for PDCCH monitoring occasions corresponding to all search space sets set within the first time interval described above.

[0351] FIG. 12 is a diagram illustrating the operation of a terminal according to the above embodiment of the present disclosure. In step (1200), the terminal may receive setting information for the first time interval or determine the first time interval through various methods described above. In step (1201), the terminal may determine whether the current slot is a slot corresponding to the first time interval. If, in step (1201), it is determined that the slot is a slot corresponding to the first time interval, the terminal may not perform monitoring of the PDCCH existing in the slot in step (1202) (i.e., PDCCH omission operation). If, in step (1201), it is determined that the slot is not a slot corresponding to the first time interval, the terminal may perform monitoring of the PDCCH existing in the slot in step (1203).

[0353] In some embodiments of the present disclosure, the terminal may perform a "PDCCH skip operation" for PDCCH monitoring occasions corresponding to all or part of the search space set within the first time interval described above. For example, the terminal may selectively perform a "PDCCH skip operation" only for PDCCH monitoring occasions corresponding to the following search space set.

[0354] - Minimum offset (K min PDCCH monitoring occasion determined by a search space set configured to monitor a DCI format containing a field indicating the value of )

[0355] - PDCCH monitoring occasion determined by a search space set where the search space type is set to terminal-specific search space

[0356] The search space set to which the above PDCCH omission operation is applied shall be collectively named the "first search space set".

[0357] For example, the terminal can still perform monitoring for PDCCH monitoring occasions corresponding to the following search space set.

[0358] - PDCCH monitoring occasion determined by a set of search spaces where the search space type is set to Common Search Space

[0359] - PDCCH monitoring occasion determined by a seek space set configured to monitor a DCI format indicating the slot format (e.g., DCI format 2_0).

[0360] - PDCCH monitoring occasion determined by a search space set configured to monitor a DCI format (e.g., DCI format 2_1) indicating pre-emption status

[0361] - PDCCH monitoring occasion determined by a seek space set configured to monitor DCI formats (e.g., DCI formats 2_2, 2_3) indicating transmit power commands

[0362] The search space set to which the above PDCCH omission operation is not applied shall be collectively named the "second search space set".

[0364] FIG. 12a is a diagram illustrating the operation of a terminal according to the above embodiment of the present disclosure. In step (1204), the terminal may receive setting information for a first time interval or determine the first time interval through various methods described above. In step (1205), the terminal may determine whether the current slot is a slot corresponding to the first time interval. If, in step (1205), it is determined that the slot is a slot corresponding to the first time interval, the terminal may determine in step (1206) whether the PDCCH monitoring occasion existing in the slot corresponds to the "first search space set." If, in step (1206), it is determined that it corresponds to the first search space set, the terminal may not perform monitoring for the corresponding PDCCH monitoring occasion existing in the 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 of the corresponding PDCCH monitoring occasion existing in the corresponding slot in step (1207). If it is determined in step (1205) that the corresponding slot does not correspond to the first time interval slot, the terminal may perform monitoring of the PDCCH existing in the corresponding slot in step (1209).

[0365] In some embodiments of the present disclosure, a terminal can perform monitoring of PDCCH monitoring occasions existing in a first time interval, wherein, among the PDCCH monitoring occasions existing in the first time interval, for a PDCCH monitoring occasion corresponding to both a "first search space set" and a "second search space set" (i.e., when a PDCCH monitoring occasion corresponding to the first search space set and a PDCCH monitoring occasion corresponding to the second search space set overlap), the terminal can perform monitoring of the PDCCH monitoring occasion.

[0366] In some embodiments of the present disclosure, a terminal may not perform monitoring of PDCCH monitoring occasions existing in a first time interval, if among the PDCCH monitoring occasions existing in the first time interval, there is a PDCCH monitoring occasion corresponding to both the "first search space set" and the "second search space set" (i.e., 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), the terminal may not perform monitoring of the PDCCH monitoring occasion.

[0367] In some embodiments of the present disclosure, the terminal may be instructed by the base station via upper layer signaling or L1 signaling whether to perform a PDCCH omission operation in the first time interval.

[0368] In the above-described embodiment, the slot index can 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 way.

[0369] In the above-described embodiment, the slot index can be replaced with an index related to PDCCH monitoring, such as a PDCCH monitoring occasion index, and applied in the same way. For example, the PDCCH monitoring occasion index may correspond to an index of a PDCCH monitoring occasion determined as a set of search spaces where a DCI indicating a minimum offset value is transmitted.

[0371] <Fourth Embodiment>

[0372] In some embodiments of the present disclosure, a terminal may receive one or more cells from a base station and may receive different minimum offset values ​​set or instructed for each cell (or likewise for each cell and for each bandwidth part). In this case, the terminal may assume or apply the same minimum offset value to a specific cell group or set of cells among the set cells. The set of cells to which the aforementioned same minimum offset value is assumed or applied shall be named the "first cell group." The first cell group may be determined, for example, by one or more combinations of the following cases.

[0373] - A set of cells existing within the same frequency range (FR) (for example, the frequency range may be divided into FR1 and FR2 according to the carrier frequency (e.g., frequencies lower than 6 GHz or higher frequency bands), and the terminal may assume or apply the same minimum offset value to the cells existing in FR1 and may assume or apply the same minimum offset value to the cells existing in FR2.)

[0374] - A set of cells existing in the same frequency layer (FL).

[0375] - A set of cells existing in the same cell group (e.g., can be divided into a Master Cell Group (MCG) or a Secondary Cell Group, and the terminal may assume or apply the same minimum offset value to the cells existing in the MCG and may assume or apply the same minimum offset value to the cells existing in the SCG).

[0376] - Set of cells corresponding to intra-band CA (The terminal may assume or apply the same minimum offset value to the cells corresponding to intra-band CA.)

[0377] - A set of cells configured for cross-carrier scheduling (e.g., among Cell #0, Cell #1, ..., Cell #N-1, Cell #0 may be configured for self-carrier scheduling, and Cell #1, ..., Cell #N-1 may be configured for cross-carrier scheduling. In this case, the same minimum offset value may be assumed or applied to Cell #0, Cell #1, ..., Cell #N-1 for which Cell #0 performs scheduling.)

[0378] In a method for assuming or applying the same minimum offset value to cells existing within a first cell group in some embodiments of the present disclosure, at least one of the following methods or a combination of one or more methods may be applied.

[0379] - Method 1: For 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 instructed, and the terminal can be notified multiple K min (i) K corresponding to the minimum (or maximum) value among the values ​​(i=0, 1, ..., N-1). min The minimum offset can be assumed as a value.

[0380] - Method 2: For 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 instructed, and in this case, the terminal has multiple K min (i) It may not be expected that the values ​​(i=0, 1, ..., N-1) will be set or indicated as different values.

[0381] - Method 3: The terminal selects K from the reference cell X among the cells i (i=0, 1, ..., N-1) existing in the first cell group. minIt can be set or instructed, and this can be applied equally to all cells existing within the first cell group. Cell X can be determined, for example, as the cell having the lowest (or highest) index among the cells, or PCell or PSCell or the cell performing scheduling.

[0383] Through the aforementioned fourth embodiment, when the terminal operates with carrier aggregation, the same minimum offset value can be applied to all cells in the first cell group, and accordingly, the terminal can operate in a power reduction mode for all cells in the first cell group simultaneously, thereby more effectively reducing the terminal's power consumption.

[0385] <Fifth Embodiment>

[0386] In some embodiments of the present disclosure, a terminal may receive one or more cells from a base station and may receive different minimum offset values ​​set or instructed for each cell (or likewise for each cell and bandwidth part). In this case, the terminal may assume or apply the same application delay time to a specific cell group or set of cells among the set cells. The set of cells to which the aforementioned same application delay time is assumed or applied shall be named the "first cell group." The first cell group may be determined, for example, by at least one of the following cases or a combination of one or more cases.

[0387] - A set of cells existing within the same Frequency Range (FR) (for example, the frequency range may be classified into FR1 and FR2 according to the carrier frequency (e.g., frequencies lower than 6 GHz or higher frequency bands), and the terminal may assume or apply the same minimum offset value to cells existing in FR1, and assume or apply the same application delay time to cells existing in FR2.)

[0388] - A set of cells existing in the same frequency layer (FL).

[0389] - A set of cells existing in the same cell group (e.g., can be divided into a Master Cell Group (MCG) or a Secondary Cell Group, and the terminal may assume or apply the same minimum offset value to the cells existing in the MCG and may assume or apply the same minimum offset value to the cells existing in the SCG).

[0390] - Set of cells corresponding to intra-band CA (The terminal may assume or apply the same minimum offset value to the cells corresponding to intra-band CA.)

[0391] - A set of cells configured for cross-carrier scheduling (e.g., among Cell #0, Cell #1, ..., Cell #N-1, Cell #0 may be configured for self-carrier scheduling, and Cell #1, ..., Cell #N-1 may be configured for cross-carrier scheduling. In this case, the same application delay time may be assumed or applied to Cell #0, Cell #1, ..., Cell #N-1 for which Cell #0 performs scheduling.)

[0392] In a method for assuming or applying the same application delay time value to cells existing within a first cell group in some embodiments of the present disclosure, at least one of the following methods or a combination of one or more methods may be applied.

[0393] - Method 1: For 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 instructed, and the terminal can be notified multiple K min (i) K corresponding to the minimum (or maximum) value among the values ​​(i=0, 1, ..., N-1).min The application delay time can be determined as a function of the value. For example, it can be determined by the following formula.

[0394] [Mathematical Formula 4] When taking the minimum value

[0395] T app = ceil(T0+ T delay ) * S where T delay = max(K min,pre , T delay,min )

[0396] K min,pre = min(K min,pre (0), K min,pre (1), ..., K min,pre (N-1)

[0397] [Mathematical Formula 5] When taking the maximum value

[0398] T app = ceil(T0+ T delay ) * S where T delay = max(K min,pre , T delay,min )

[0399] K min,pre = max(K min,pre (0), K min,pre (1), ..., K min,pre (N-1)

[0400] K min,pre (i) may correspond to the minimum offset value currently assumed in cell i, and if the numerologies of PDCCH and PDSCH are different, scaling may be applied based on the numerology of the control channel by considering the ratio of the subcarrier spacing of the control channel to the subcarrier spacing of the data channel. For example, K min,pre (i) = K min,pre (i) * S2 and S2=2 (μ_control-μ_data) It can be determined as follows. For example, if the first cell group corresponds to a set of cells configured for cross-carrier scheduling, the application delay time may be determined as follows.

[0401]

[0402] - Method 2: For 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 instructed, and in this case, the terminal has multiple K min (i) It may not be expected that the values ​​(i=0, 1, ..., N-1) will be set or indicated as different values.

[0403] - Method 3: The terminal selects K from the reference cell X among the cells i (i=0, 1, ..., N-1) existing in the first cell group. min It can be set or instructed, and based on this value, the same application delay time can be applied to all cells existing within the first cell group. Cell X can be determined, for example, as the cell having the lowest (or highest) index among the cells, or PCell or PSCell or the cell performing scheduling.

[0404] - Method 4: For 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 instructed, and the terminal can be notified multiple K min (i) Based on the values ​​(i=0, 1, ..., N-1), the application delay time T of each cell delay (i) (i=0, 1, ..., N-1) can be determined. The terminal is T delay (i) The application delay time can be determined by the value corresponding to the minimum (or maximum) value among the values ​​(i=0, 1, ..., N-1).

[0406] Through the aforementioned fifth embodiment, when the terminal operates with carrier aggregation, the same application delay time can be applied to all cells in the first cell group, and accordingly, the terminal can operate in a power reduction mode for all cells in the first cell group simultaneously, thereby more effectively reducing the terminal's power consumption.

[0408] <6th Embodiment>

[0409] In one embodiment of the present disclosure, a terminal may receive 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 configured in the terminal, Time Domain Resource Allocation Table #1 and Time Domain Resource Allocation Table #2 may be configured in the terminal as configuration information for each bandwidth part, respectively. The terminal may use a time domain resource allocation table corresponding to a bandwidth part index indicated by a bandwidth part indicator within a DCI. For example, if a bandwidth part indicator within a DCI indicates Bandwidth Part #N, the terminal may interpret the Time Domain Resource Allocation Table #N configured as the configuration information for Bandwidth Part #N when interpreting the Time Domain Resource Allocation Table field within the corresponding DCI.

[0410] The terminal can receive a minimum offset value from the base station via the DCI transmitted from the currently active bandwidth part, and can limit the scheduling offset value in each bandwidth part based on the received minimum offset value. That is, if bandwidth part A and bandwidth part B are configured in the terminal, time domain resource allocation table A is configured in bandwidth part A and time domain resource allocation table B is configured in bandwidth part B, and the currently active bandwidth part is bandwidth part A, the terminal can obtain the minimum offset value (K) via the DCI transmitted from bandwidth part A. min The terminal can receive instructions from the base station for ). The terminal is K minBased on the value, scheduling limits for not only the currently active bandwidth Part A but also the inactive bandwidth Part B can be determined. That is, the terminal has a scheduling offset of K in bandwidth Part A. min You may not expect to be scheduled with a smaller value (i.e., the scheduling offset value of time domain table A is K min (Do not expect to be indicated by a value smaller than), in bandwidth part B, the scheduling offset is f(K min One may not expect to be scheduled to a value smaller than ) (i.e., the scheduling offset value of time domain table B is f(K min (Do not expect to be indicated by a value smaller than ). In this case, f(K min ) is K min It may correspond to any function with as a parameter. In the above situation, if the subcarrier spacing (or numerology) of the currently active bandwidth part A and the currently inactive bandwidth part B are different, f(K) is calculated by considering the subcarrier spacing (μ_A) of bandwidth part A and the subcarrier spacing (μ_B) of bandwidth part B. min ) can be determined. f(K min The following methods may be considered as examples for determining ).

[0411] [Method 1]

[0412] K received in the active bandwidth part A min When applying the value for scheduling limits of disabled bandwidth part B, K based on the subcarrier spacing of bandwidth part A min The value can be applied directly to Bandwidth Part B. For example, f(K min ) can be defined as follows.

[0413] f(K min ) = K min

[0414] [Method 2]

[0415] K received in the active bandwidth part A min When applying a value for scheduling limits of disabled bandwidth part B, K based on the subcarrier spacing of bandwidth part B min The value can be applied after recalculating. For example, f(K min ) can be defined as follows.

[0416] 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 )

[0417] [Method 3]

[0418] K received in the active bandwidth part A min When applying the value for scheduling limits of disabled bandwidth Part B, K based on the reference subcarrier interval μ_R min The value can be recalculated and applied to Bandwidth Part B. In this case, μ_R can be defined as the smaller value between μ_A and μ_B, or it can correspond to a value set at the terminal through upper-layer signaling. For example, f(K min ) can be defined as follows.

[0419] 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 )

[0421] When a terminal receives a minimum offset value via DCI in slot n, the terminal can apply the received minimum offset value starting from n+X. As previously mentioned, X can be referred to as the application delay time. In this case, regarding the method for determining the application delay time X, parameters such as the subcarrier spacing (μ_A) of bandwidth part A and the subcarrier spacing (μ_B) of bandwidth part B may be considered. For example, the following methods may be considered.

[0422] [Method 4]

[0423] The application delay time X can be determined based on the subcarrier spacing of the activated bandwidth part A. For example, X can be determined as follows.

[0424] X = max(floor(K min,old · 2 μ0 / 2 μ1 ), Z),

[0425] In the above mathematical formula, K min,old is the minimum offset value currently assumed by the terminal, μ0 is the subcarrier interval of the PDCCH, μ1 is the subcarrier interval of the PDCCH, and Z is the minimum value of the pre-defined application delay time, respectively.

[0426] [Method 5]

[0427] The application delay time X can be determined by considering both the subcarrier intervals of the active bandwidth part A and the inactive bandwidth part B. For example, the application delay time can be calculated based on the smaller value between the subcarrier interval (μ_A) of bandwidth part A and the subcarrier interval (μ_B) of bandwidth part B. As an example, it can be determined as follows.

[0428] X = max(floor(K min,old · 2 μ0 / 2 μ1 ) · 2 μ_R / 2 μ_A , Z),

[0429] In the above mathematical formula, μ_R can be defined as the smaller value between μ_A and μ_B.

[0430] [Method 6]

[0431] The application delay time X can be determined by considering both the subcarrier intervals of the active bandwidth part A and the inactive bandwidth part B. For example, the minimum offset value can be recalculated based on the subcarrier interval of bandwidth part B by considering the ratio of the subcarrier interval of bandwidth part A to the subcarrier interval of bandwidth part B, and the application delay time X for bandwidth part B can be determined based on the recalculated minimum offset value. As an example, it can be determined as follows.

[0432] X = max(floor(K min,old · 2 μ_B / 2 μ_A · 2 μ0 / 2 μ1 ), Z μ_B ), or

[0433] X = max(floor(f(K min,old ) · 2 μ0 / 2 μ1 ), Z μ_B ),

[0434] In the above mathematical formula, K min,old f(K) is the minimum offset value assumed by the terminal for bandwidth part A. min,old ) is the minimum offset value assumed by the terminal for Bandwidth Part B, or the minimum offset value recalculated by considering the ratio of the subcarrier spacing between Bandwidth Part A and Bandwidth Part B, Z μ can each correspond to the minimum value of the application delay time defined corresponding to the subcarrier spacing parameter μ. f(K min,old The method for determining ) may follow the aforementioned methods 1, 2, 3, etc.

[0435] In the above-described 6th embodiment, if scheduling in the same bandwidth part (Same-BWP scheduling), that is, scheduling from bandwidth part A to bandwidth part A, then μ_B = μ_A.

[0437] If the terminal receives an indicator to enable Bandwidth Part B, which is disabled via DCI in slot n, the terminal enables Bandwidth Part B in slot n+T BWP It can be activated at a later point. Here, T BWP can be defined as the bandwidth part change delay (refer to the description of the bandwidth part and the contents of Table 2-1 above). The terminal can monitor the PDCCH in the currently active bandwidth part A and receive a DCI containing scheduling information for the inactive bandwidth part B through the said PDCCH. At this time, the base station may not perform scheduling when scheduling to bandwidth part B at a time that is smaller than the bandwidth part change delay, taking into account the delay time for activating the terminal's bandwidth part B. The terminal may also not expect a scheduling offset value smaller than the bandwidth part change delay time to be indicated. If the terminal receives a minimum offset value in the currently active bandwidth part A, the terminal may assume a scheduling restriction (not expecting a scheduling offset value to be indicated smaller than a specific value) regarding scheduling for the inactive bandwidth part B, taking into account the minimum offset value, the application delay time, and the bandwidth part delay time.

[0438] In one embodiment of the present disclosure, the terminal has a minimum offset value (K min ) and bandwidth part delay time (T BWP The scheduling limit for disabled bandwidth part B can be determined by considering all of ). For example, the terminal can determine the scheduling limit for disabled bandwidth part B using max(g(K min ), T BWPOne may not expect the scheduling offset value to be indicated as a value smaller than ). In this case, g(K min ) is K min It may correspond to any function having as a parameter. According to one embodiment, g(K min ) can be defined based on any method including the method for converting the minimum offset for bandwidth part B described in Method 1, Method 2, and Method 3 of the aforementioned 6th embodiment.

[0439] In one embodiment of the present disclosure, the terminal has an application delay time (X) and a bandwidth part delay time (T BWP The scheduling limit for disabled bandwidth part B can be determined by considering all of ). For example, the terminal can determine the scheduling limit for disabled bandwidth part B using max(g(X), T BWP It may not be expected that the scheduling offset value will be indicated as a value smaller than ). In this case, g(X) may correspond to any function with 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 previously described 6th embodiment.

[0440] <Example 6-1>

[0441] In one embodiment of the present disclosure, the terminal may receive a minimum offset value from a base station via a DCI transmitted in the currently active bandwidth part, and may determine whether the entries of a time domain resource allocation table set for each bandwidth part are valid or invalid based on the received minimum offset value. As described above, the terminal may receive a minimum offset value (K) via a DCI transmitted in the currently active bandwidth part A. min ) can receive instructions from the base station, and if the terminal receives a DCI format scheduling with Bandwidth Part B, K minThe scheduling limit of Bandwidth Part B can be determined based on the value. (For example, considering the ratio of the subcarrier spacing of Bandwidth Part A to the subcarrier spacing of Bandwidth Part B, K based on Bandwidth Part B min K recalculated from min Based on, K min ' = f(K min ) = ceil(K min * 2 μ_B / 2 μ_A (Assuming ) to determine the scheduling limit of Bandwidth Part B) That is, if the terminal receives a DCI scheduling data to Bandwidth Part B, the terminal determines that among the time domain resource allocation information for data scheduling to Bandwidth Part B, the scheduling offset value (K) is K min You may not expect it to be indicated by a smaller value.

[0442] In this case, after applying scheduling constraints, all entries within the time domain resource allocation table configured in Bandwidth Part B may be invalid. That is, all scheduling offset (K) values ​​within the time domain resource allocation table configured in Bandwidth Part B are K min It may be smaller. In this case, it is necessary to define additional terminal operations for the DCI format that directs scheduling to Bandwidth Part B. For example, the following methods may be considered.

[0443] [Method 1]

[0444] According to one embodiment, a base station provides one or more minimum offset values ​​(e.g., minimum offset #1 = K) to a terminal via upper layer signaling (e.g., RRC). min (1), minimum offset #2 = K minA set of minimum offset values ​​composed of (2)) can be set, and one of the set minimum offset values ​​can be indicated to the terminal through L1 signaling (e.g., DCI). The base station can set the set of minimum offset values ​​to the terminal for each bandwidth part configured to the terminal. For example, a set of minimum offset values ​​A can be set for bandwidth part A, and a set of minimum offset values ​​B can be set for bandwidth part B. The terminal can set one minimum offset value (K) among the minimum offset values ​​within the set of minimum offset values ​​through L1 signaling (e.g., DCI) transmitted from the currently active bandwidth part. min Can be instructed to ), and the received minimum offset value K min Based on this, scheduling limits for currently active and inactive bandwidth parts can be determined (see above). In this case, as previously explained, there may not be any valid entries in the time domain resource allocation table.

[0445] To solve this problem, in one embodiment, when a base station sets a time domain resource allocation table for each bandwidth part for a terminal, it may set an entry in the time domain resource allocation table by considering the maximum value (referred to as the "maximum minimum offset value") among the minimum offset values ​​within the set of minimum offset values ​​set for each bandwidth part. The base station may set the terminal such that there always exists an entry in the time domain resource allocation table of each bandwidth part in which the scheduling offset value is greater than or equal to the "maximum minimum offset value." That is, the time domain resource allocation table of each bandwidth part set by the base station for the terminal may be set such that there exists at least one entry having a scheduling offset value greater than or equal to the "maximum minimum offset value." The terminal may not expect the base station to have a scheduling offset value smaller than the "maximum minimum offset value" for all entries in the time domain resource allocation table of a specific bandwidth part. That is, the base station determines the setting value of the time domain resource allocation table to be set for each bandwidth part based on the setting information of the minimum offset value set pre-configured for each bandwidth part in the terminal, thereby ensuring that there is always at least one valid entry in the time domain resource allocation table of a specific bandwidth part after applying the minimum offset value.

[0446] A terminal may not expect that the scheduling offset values ​​of all entries in the time domain resource allocation table for a specific bandwidth part from the base station will be set to be smaller than the "maximum minimum offset value." If the scheduling offset values ​​of all entries in the time domain resource allocation table set for a specific bandwidth part are smaller than the "maximum minimum offset value," the terminal may consider the setting information as an error and ignore it.

[0447] [Method 2]

[0448] According to one embodiment, a base station provides one or more minimum offset values ​​(e.g., minimum offset #1 = K) to a terminal via upper layer signaling (e.g., RRC). min (1), minimum offset #2 = K min A set of minimum offset values ​​composed of (2)) can be set, and one of the set minimum offset values ​​can be indicated to the terminal through L1 signaling (e.g., DCI). The base station can set the set of minimum offset values ​​to the terminal for each bandwidth part configured to the terminal. For example, a set of minimum offset values ​​A can be set for bandwidth part A, and a set of minimum offset values ​​B can be set for bandwidth part B. The terminal can set one minimum offset value (K) among the minimum offset values ​​within the set of minimum offset values ​​through L1 signaling (e.g., DCI) transmitted in the currently active bandwidth part. min Can be instructed to ), and the received minimum offset value K min Based on this, scheduling limits for currently active and inactive bandwidth parts can be determined (see above). In this case, as previously explained, there may not be any valid entries in the time domain resource allocation table.

[0449] To solve this problem, in one embodiment, when a base station sets a set of minimum offset values ​​for each bandwidth part to a terminal, it may set a set of minimum offset values ​​composed of minimum offset values ​​that are smaller than or equal to the "minimum maximum scheduling offset value" among the scheduling offset values ​​in the time domain resource allocation table set for each bandwidth part, and may not set a set of minimum offset values ​​composed of minimum offset values ​​that are larger than the "minimum maximum scheduling offset value." Here, the "minimum maximum scheduling offset value" refers to the value corresponding to the minimum value among the "maximum scheduling offset values" of each bandwidth part, where the maximum value among the scheduling offset values ​​in the time domain resource allocation table set for a specific bandwidth part is named the "maximum scheduling offset value." That is, the base station can determine the setting value of the set of minimum offset values ​​to be set for each bandwidth part based on the information of the time domain resource allocation table pre-configured for each bandwidth part in the terminal, thereby ensuring that after applying the minimum offset value, there is always at least one valid entry in the time domain resource allocation table of a specific bandwidth part.

[0450] The terminal may not expect that a specific minimum offset value within a set of minimum offset values ​​for a specific bandwidth part from the base station will be set to a value greater than the "minimum maximum scheduling offset value." If the terminal finds that a specific minimum offset value within a set of minimum offset values ​​for a specific bandwidth part is greater than the "minimum maximum offset value," the terminal may consider the setting information as an error and ignore it.

[0451] [Method 3]

[0452] According to one embodiment, a base station provides one or more minimum offset values ​​(e.g., minimum offset #1 = K) to a terminal via upper layer signaling (e.g., RRC).min (1), minimum offset #2 = K min A set of minimum offset values ​​composed of (2)) can be set, and one of the set minimum offset values ​​can be indicated to the terminal through L1 signaling (e.g., DCI). The base station can set the set of minimum offset values ​​to the terminal for each bandwidth part configured to the terminal. For example, a set of minimum offset values ​​A can be set for bandwidth part A, and a set of minimum offset values ​​B can be set for bandwidth part B. The terminal can set one minimum offset value (K) among the minimum offset values ​​within the set of minimum offset values ​​through L1 signaling (e.g., DCI) transmitted in the currently active bandwidth part. min Can be instructed to ), and the received minimum offset value K min Based on this, scheduling limits for currently active and inactive bandwidth parts can be determined (see above). In this case, as previously explained, there may not be any valid entries in the time domain resource allocation table.

[0453] To solve this problem, in one embodiment, if the terminal receives a DCI format for scheduling to an inactive bandwidth part B, and all scheduling offset values ​​in the time domain resource allocation table of bandwidth part B are smaller than the currently assumed minimum offset value (i.e., when the currently assumed minimum offset value is applied to bandwidth part B, it is determined that all entries in the time domain resource allocation table of bandwidth part B are invalid), the terminal [is] the currently assumed minimum offset value (K min ) can be assumed to be the scheduling offset (K) for data scheduled in Bandwidth Part B (i.e., the terminal [assumes] the scheduling offset value K among the time domain resource allocation information of the data scheduled in Bandwidth Part B as K minIt can be assumed as follows). That is, when the base station performs scheduling for the terminal with bandwidth part B, where only invalid entries exist, the scheduling offset value K is the minimum offset value (K currently assumed by the terminal). min Scheduling can be performed using ), and for the corresponding bandwidth part B, the terminal uses the currently assumed minimum offset value (K min You can expect data to be scheduled with a scheduling offset corresponding to ).

[0454] [Method 3-1]

[0455] According to one embodiment, the above-described [Method 3] may be implemented in a limited manner when a basic time domain resource allocation table is set in bandwidth part B, or when the scheduling offset value of all entries in the time domain table is set to 0. A basic time domain resource allocation table may refer to a time domain resource allocation table that the terminal basically assumes when the terminal has not received a time domain resource allocation table from a base station through upper layer signaling.

[0457] [Method 4]

[0458] According to one embodiment, a base station provides one or more minimum offset values ​​(e.g., minimum offset #1 = K) to a terminal via upper layer signaling (e.g., RRC). min (1), minimum offset #2 = K minA set of minimum offset values ​​composed of (2)) can be set, and one of the set minimum offset values ​​can be indicated to the terminal through L1 signaling (e.g., DCI). The base station can set the set of minimum offset values ​​to the terminal for each bandwidth part configured to the terminal. For example, a set of minimum offset values ​​A can be set for bandwidth part A, and a set of minimum offset values ​​B can be set for bandwidth part B. The terminal can set one minimum offset value (K) among the minimum offset values ​​within the set of minimum offset values ​​through L1 signaling (e.g., DCI) transmitted in the currently active bandwidth part. min Can be instructed to ), and the received minimum offset value K min Based on this, scheduling limits for currently active and inactive bandwidth parts can be determined (see above). In this case, as previously explained, there may not be any valid entries in the time domain resource allocation table.

[0459] To solve this problem, in one embodiment, when a base station instructs a terminal to a minimum offset value through L1 signaling (e.g., DCI), it may instruct a minimum offset value that is always smaller than or equal to the "minimum maximum scheduling offset value" among the scheduling offset values ​​in the time domain resource allocation table set for each bandwidth part, and may not instruct a minimum offset value that is larger than the "minimum maximum scheduling offset value." Here, the "minimum maximum scheduling offset value" refers to the value corresponding to the minimum value among the "maximum scheduling offset values" of each bandwidth part, where the maximum value among the scheduling offset values ​​in the time domain resource allocation table set for a specific bandwidth part is named the "maximum scheduling offset value." That is, the base station can determine the minimum offset value to be directed via L1 signaling (e.g., DCI) based on information in the time domain resource allocation table pre-configured for each bandwidth part in the terminal, thereby ensuring that after applying the minimum offset value, there is always at least one valid entry in the time domain resource allocation table of a specific bandwidth part.

[0460] A terminal may not expect a minimum offset value indicated by L1 signaling (e.g., DCI) from a base station to be greater than a "minimum maximum scheduling offset value." If the minimum offset value received by the terminal via L1 signaling (e.g., DCI) is greater than a "minimum maximum offset value," the terminal may consider the received DCI to be an error and discard or ignore the contents of the DCI.

[0462] To carry out the embodiments described above, the transceiver, memory, and processor of the terminal and the base station are illustrated in FIGS. 13 and FIGS. 14, respectively. In the embodiments described above, a method of transmission and reception between the base station and the terminal for reducing power consumption of the terminal is shown. To carry out this, the transceiver, memory, and processor of the base station and the terminal must each operate according to the embodiments.

[0463] FIG. 13 illustrates the structure of a terminal according to one embodiment of the present disclosure.

[0464] 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 examples described above. For example, the terminal may include more components or fewer components than the components described above. In addition, the transceiver (1301), the memory (1302), and the processor (1303) may be implemented in the form of a single chip.

[0465] According to one embodiment of the present disclosure, the transceiver (1301) can transmit and receive signals with a base station. The above-described signal may include control information and data. To this end, the transceiver (1301) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. Additionally, the transceiver (1301) may receive a signal through a wireless channel and output it to a processor (1303), and transmit the signal output from the processor (1303) through a wireless channel.

[0466] According to one embodiment of the present disclosure, the memory (1302) may store programs and data necessary for the operation of the terminal. Additionally, the memory (1302) may store control information or data included in signals transmitted and received by the terminal. The memory (1302) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1302) may be composed of a plurality of memories. According to one embodiment of the present disclosure, the memory (1302) may store a program for controlling and receiving operations to reduce the power consumption of the terminal.

[0467] According to one embodiment of the present disclosure, the processor (1303) can control a series of processes in which the terminal can operate according to the embodiments of the present disclosure described above. For example, the processor (1303) can control a power consumption reduction operation of the terminal according to the embodiments of the present disclosure.

[0468] Specifically, the processor (1303) can control each configuration of a terminal having an operation of receiving configuration information for a PDCCH from a base station, monitoring the PDCCH from the base station based on the configuration information for the PDCCH from the base station, detecting the PDCCH based on the monitoring, and applying the received control content.

[0469] Additionally, the processor (1303) may include a plurality of processors and, by executing a program stored in memory (1202), can perform a method to reduce power consumption of the terminal according to embodiments of the present disclosure.

[0470] FIG. 14 illustrates the structure of a base station according to one embodiment of the present disclosure.

[0471] Referring to FIG. 14, the 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 examples described above. For example, the terminal may include more components or fewer components than the components described above. In addition, the transceiver (1401), the memory (1402), and the processor (1403) may be implemented in the form of a single chip.

[0472] According to one embodiment of the present disclosure, the transceiver (1401) can transmit and receive signals with a terminal. The above-described signal may include control information and data. To this end, the transceiver (1401) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. Additionally, the transceiver (1401) may receive a signal through a wireless channel and output it to a processor (1403), and transmit the signal output from the processor (1403) through a wireless channel.

[0473] According to one embodiment of the present disclosure, the memory (1402) may store programs and data necessary for the operation of a base station. Additionally, 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 or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1402) may be composed of a plurality of memories. According to one 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 the base station.

[0474] According to one embodiment of the present disclosure, the processor (1403) can control a series of processes to enable the base station to operate according to the embodiment of the present disclosure described above. For example, the processor (1403) can control each component of the base station to generate and transmit control information for reducing the power consumption of the terminal.

[0475] Additionally, the processor (1403) may include a plurality of processors and, by executing a program stored in memory (1402), can perform a method of generating control information and transmitting a downlink control channel for reducing power consumption of a terminal according to embodiments of the present disclosure.

[0477] Methods according to the claims or embodiments described in the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0478] 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 the computer-readable storage medium or computer program product are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to the claims or embodiments described in the specification of this disclosure.

[0479] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), magnetic disc storage devices, CD-ROM (Compact Disc-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0480] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0481] In the specific embodiments of the present disclosure described above, the components included in the present disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0482] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated together as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other variations based on the technical concept of the embodiments may also be possible. For example, the embodiments may be applied to LTE systems, 5G or NR systems, etc.

Claims

Claim 1 A method for a terminal of a communication system comprising: receiving a first DCI (downlink control information) from a base station in slot n, the DCI including a field indicating a first minimum offset value; determining an application delay time for applying the first minimum offset value; and applying the first minimum offset value in slot n+k, wherein k is the application delay time, and during a time interval corresponding to the application delay time from slot n, a second minimum offset value having a value different from the first minimum offset value is not indicated by the DCI. Claim 2 A method according to claim 1, wherein the application delay time is determined based on the subcarrier spacing of the PDCCH (physical downlink control channel), the subcarrier spacing of the PDSCH (physical downlink shared channel), and the symbol position of the first DCI within slot n. Claim 3 A method according to claim 1, characterized in that the first DCI including a field indicating the first minimum offset value is DCI format 0_1 ​​or DCI format 1_1. Claim 4 A method according to claim 1, wherein the field indicating the first minimum offset value indicates both the minimum offset value associated with PDSCH and the minimum offset value associated with PUSCH (physical uplink shared channel). Claim 5 A method of a base station of a communication system comprising: a step of transmitting a first DCI (downlink control information) including a field indicating a first minimum offset value to a terminal in slot n; a step of determining an application delay time for applying the first minimum offset value; and a step of applying the first minimum offset value in slot n+k, wherein k is the application delay time, and during a time interval corresponding to the application delay time from slot n, a second minimum offset value having a value different from the first minimum offset value is not indicated by the DCI. Claim 6 A method according to claim 5, wherein the application delay time is determined based on the subcarrier spacing of the PDCCH (physical downlink control channel), the subcarrier spacing of the PDSCH (physical downlink shared channel), and the symbol position of the first DCI within slot n. Claim 7 A method according to claim 5, characterized in that the first DCI including a field indicating the first minimum offset value is DCI format 0_1 ​​or DCI format 1_1. Claim 8 A method according to claim 5, wherein the field indicating the first minimum offset value indicates both the minimum offset value associated with PDSCH and the minimum offset value associated with PUSCH (physical uplink shared channel). Claim 9 A terminal of a communication system comprising: a transmitting and receiving unit; and a control unit configured to receive a first DCI (downlink control information) including a field indicating a first minimum offset value from a base station in slot n, check an application delay time for applying the first minimum offset value, and apply the first minimum offset value in slot n+k, wherein k is the application delay time, and during a time interval corresponding to the application delay time from slot n, a second minimum offset value having a value different from the first minimum offset value is not indicated by the DCI. Claim 10 A terminal characterized in that, in claim 9, the above-mentioned application delay time is determined based on the subcarrier spacing of the PDCCH (physical downlink control channel), the subcarrier spacing of the PDSCH (physical downlink shared channel), and the symbol position of the first DCI within slot n. Claim 11 A terminal according to claim 9, characterized in that the first DCI including a field indicating the first minimum offset value is DCI format 0_1 ​​or DCI format 1_1. Claim 12 A terminal according to claim 9, characterized in that the field indicating the first minimum offset value indicates both the minimum offset value associated with PDSCH and the minimum offset value associated with PUSCH (physical uplink shared channel). Claim 13 A base station of a communication system comprising: a transmitting and receiving unit; and a control unit configured to transmit downlink control information (DCI) including a field indicating a first minimum offset value to a terminal in slot n, check an application delay time for applying the first minimum offset value, and apply the first minimum offset value in slot n+k, wherein k is the application delay time, and during a time interval corresponding to the application delay time from slot n, a second minimum offset value having a value different from the first minimum offset value is not indicated by the DCI. Claim 14 A base station characterized in that, in paragraph 13, the above-mentioned application delay time is determined based on the subcarrier spacing of the PDCCH (physical downlink control channel), the subcarrier spacing of the PDSCH (physical downlink shared channel), and the symbol position of the first DCI within slot n. Claim 15 A base station according to claim 13, characterized in that the first DCI including a field indicating the first minimum offset value is DCI format 0_1 ​​or DCI format 1_1. Claim 16 A base station according to claim 13, characterized in that the field indicating the first minimum offset value indicates both the minimum offset value associated with PDSCH and the minimum offset value associated with PUSCH (physical uplink shared channel).

Images